Introduction to the correct maintenance of exterior lamps

It is an extremely quick and simple task to check the bulbs of lamps outside the car for burnout failures. However, it is not so simple to maintain a comprehensive system of exterior lamps. Timely maintenance of exterior lights is very important to the driver, because it not only affects the comfort of driving, but also directly affects the safety of driving. It is often difficult for car owners to realize that the headlights, taillights, turn signals or parking lights are not working properly before being reminded. By the way, the work of replacing a burnt out bulb is very simple, and the cost of DIY is lower than the charging standard for maintenance of the lighting system at the repair station.

In more cases, the failure of car lights is by no means limited to small problems such as bulb burnout, rusty socket or damaged plug. It is often necessary to adopt professional diagnostic techniques to analyze the root cause of the failure. Even for the most expensive cars, the internal and external lamps are controlled by the main computer; while for luxury cars, only the headlights are controlled by three computers.

If the car is equipped with DRLs (Daytime Running Lamps), you must first understand the working principle of these devices. For example, some daytime running lights cannot be turned on before the engine is started; for some daytime running lights, if the parking brake has not been cancelled, even if the engine has been started, the daytime running lights still cannot work normally. If the vehicle is equipped with light-controlled lights (that is, when the external light is dim to a certain degree, the system has the function of automatically turning on the headlights), you may wish to check the working conditions of the lights during the light sensitivity from the weakest to the strongest state. Of course Don’t neglect to check the automatic shutdown timer. If the system is equipped with a timer, please set it to the maximum delay.

If the headlights are damaged, they are usually replaced with similar lamps. Some cars are equipped with high-intensity discharge headlights HID, which generates high-density light sources through high-voltage arc discharge generated by its pre-designed electronic system. Note that ordinary quartz-halogen bulbs cannot be used here. In addition, check the headlight lens for cracks, because although surface cracks will not affect the lighting performance of the headlights, moisture will penetrate into the lamps along the cracks, which will inevitably reduce the service life of the bulb.

The calibration of the direction of the headlights should also be included in the list of maintenance items, because in order to ensure the maximum safety of the driver, the headlights must be able to provide good forward lighting for the moving vehicle.

While grasping the key, don't forget to check other light systems, such as turn signals, license plate lights, width lights, parking lights, reversing lights, and brake lights (including the middle-high brake lights CHMSL). In addition, many vehicles also use fog lights as standard equipment or popular options. Fog lights are generally installed at a lower position on the car, so they are easily damaged by stones. When maintaining them, in addition to checking the lighting system In addition to itself, the cracks in the headlight lens should not be ignored.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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How to quickly deal with the fogging of car front windshield

“The weather is getting cold. A few days ago, it was raining, damp and cold, and the front windshield was foggy. I was panicked.” Miss Guo, who lives in Jiaojiang, just bought a car and has to drive to Luqiao to work every day. Faced with this old problem that seriously affected driving safety, she was at a loss. “I had to turn on the air conditioner and blow on the glass. But when I turned on the air conditioner on a cold day, I would catch the cold as well. This is no good.”
The reporter learned that the reason for the fogging of the car windows is “heating inside and cold outside”. When the temperature difference between the inside and outside of the car is large, the water vapor exhaled by the occupants of the car will condense into water vapor when it encounters the cold glass. This is an old problem, but not a small one. Once the line of sight is blocked, accidents may occur within a few seconds. Therefore, defogging is essential in cold rainy days.
The day before yesterday, the reporter interviewed Mr. Han with 5 years of driving experience, Coach Lin from Wanli Auto School, and Master Su from Shunfeng Auto Repair Shop on the issue of "fogging in the front", and summarized three methods with higher usage rates for comparison.
*The original method: wipe with a dry cloth or paper towel
advantages: immediate results
Disadvantages: laborious, unsafe, leaving marks after rubbing
*The original method is to wipe the glass directly with a dry cloth. Many citizens must have seen this kind of scene: the old drivers always keep a towel and wipe the glass when they stop at a red light. The disadvantage of this method is that it is more laborious, there will still be traces on the glass after wiping, and it will soon become foggy. If you wipe while driving, it is easy to cause an accident. Netizen Uranus1126 said that on the first rainy day after he picked up the car, he in the passenger seat helped the driver's wife wipe the glass, “but I still scratched with another car afterwards.”
*Convenient way: blow with hot air
Advantages: No need to distract
Disadvantages: the effect is slow, and the rest of the car windows are still foggy
The second method is to blow directly with hot air. However, this method works relatively slowly, and when the hot air is turned on when the vehicle is moving, the fog on the front glass is getting bigger and bigger, and the glass will gradually become clear after waiting for more than ten minutes. The netizen “The first opportunity in the park” suggested that the hot air should be turned on immediately after the car is warmed up. At the beginning, use a “high temperature” above 25°C to blow first, and then slowly lower the temperature after the fog disappears, and control it to around 22°C.
*Creative method: detergent with dry cloth
Advantages: Good prevention effect
Disadvantages: to be dealt with in advance
The owner of the car, Mr. Han, is very happy to accept new things. Regarding the issue of “defogging in cold weather”, he collected a lot of materials on the Internet and tried the method of “dishwashing detergent with dry cloth”, and the effect was not bad. Choose a sunny day, mix the kitchen detergent with water (about 1:6), spread it evenly on the glass in the car with a sponge, and wipe it off with a dry cloth after it dries, leaving no traces. Under normal circumstances, the effect can last for half a month.
After-sales staff Huang Baohua told reporters that this method is feasible because the detergent contains surfactants, which can change the surface tension of the water and make the fog droplets quickly condense into large water droplets, which can have an anti-fogging effect. “However, this is a preventive measure and must be dealt with in advance. If you wait until fogging is found, it will be too late.” Huang Baohua said.

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New tire technology: green travel to make the road silent

As we all know, noise is seriously disturbing our daily life, and traffic noise pollution is also a common phenomenon. As long as there is a sudden sound of a horn on the road and the noise of a tyre on the other side, you may have lost half of the good mood of the day. Coupled with the hot summer roasting, it is even more irritating. Have the car owners ever thought about starting from themselves, avoiding making noise, and being a silent roadster?

Cooper tires need to overcome difficulties to effectively deal with tire noise and improve driving comfort. Cooper’s ZEONC7 sedan tires adopt a technical coup of “blocking and dispersing”. Speaking of “blocking”, the method adopted by Cooper ZEONC7 sedan tires is to design “noise barriers” on both sides of the tread along the longitudinal direction. Inside the barrier, in order to achieve the effect of mute. When it comes to “scattering”, we have to mention the unique MCT memory comfort technology of Cooper Tire.

MCT memory comfort technology mainly relies on shock-absorbing layer and filler to function. Cooper ZEONC7 car tires increase the thickness of the shock-absorbing layer on the tread, which can more effectively disperse the impact of the road surface when the vehicle is driving, especially when the vehicle is driving across a bumpy road, the owner can clearly feel that the vibration is dispersed and filtered After the stability and mute effect, the comfort is improved. The rubber filler on the sidewall is designed to be softer and more elastic than before. After being impacted by the ground, it can quickly restore the previously memorized balance state and quickly bring the owner back to the original comfortable driving feeling. Before leaving the factory, Cooper ZEONC7 sedan tires are professionally tested compared with ordinary tires. The results show that under the same road conditions and the same vehicle conditions, the vibration amplitude of Cooper ZEONC7 sedan tires is significantly smaller and the vibration time is also significantly reduced.

It is the responsibility of each of us to create a quiet and civilized urban environment. Don’t let noise pollution continue to erode our symbiotic city. Cooper’s ZEONC7 car tires provide car owners with a green travel solution for silent driving, reduce noise pollution, and provide support for jointly creating a quiet and civilized urban living environment.

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Introduction to the correct choice of lubricating oil in summer

In the summer heat, not only the human body will have various adverse reactions, but also the car. Today, I will share with you one of the things you need to pay attention to in summer-lubricants.

The role of lubricating oil

The heat generated by the friction between the various moving bearing surfaces of the engine is second only to the heat when the engine cylinder is burned, and the lubricating oil takes the heat away by pressure lubrication, thus ensuring the normal operation of the friction surface. The heated lubricating oil returns to the oil pan through the oil passage for cooling. In terms of the structure of the engine, the oil pan is located under the engine*, and it is exposed to the air. It is generally made of materials with good thermal conductivity, and the lubricating oil is air-cooled through it. The cooled lubricating oil is sent to the lubricated surface again. The viscosity of the lubricating oil is very important for protecting the engine. Only when the lubricating oil has sufficient viscosity, can it be ensured that the oil film can be maintained between the engine parts at various temperatures, thereby protecting the normal operation of the engine.

Why pay attention to the viscosity of lubricating oil in high temperature in summer?

First of all, when the engine is running at high temperatures, the anti-oxidation stability of the lubricating oil deteriorates, which intensifies its thermal decomposition, oxidation and polymerization. At the same time, the dust in the dry air and the moisture in the humid air enter the engine oil pan through the air intake system and the crankcase vent to contaminate the lubricating oil, so the lubricating oil is prone to deterioration.

Second, the viscosity of lubricating oil changes with the increase of temperature, that is, the viscosity of lubricating oil decreases when it is heated, which easily causes excessive consumption of lubricating oil.

Third, when the engine is running at high temperature, the thermal expansion of metal parts is large, the normal fitting clearance between the parts becomes smaller, and the abrasion is intensified. At the same time, the engine running at high temperature adheres carbon deposits and colloids on the piston crown, combustion chamber wall, valve head and other parts, which makes the thermal properties of metal parts worse and accelerates the damage of the mechanical parts. In addition, due to the overheating of the engine, the oil becomes thinner, the oil pressure is reduced, and the lubricating oil film is not easy to form, which also accelerates the wear of the parts.

Reasonably choose lubricating oil viscosity

Lubricants are usually classified according to viscosity and quality. There are 6 types of oils in winter, 4 types of oils in summer, and 16 types of general-purpose oils in winter and summer. Summer lubricating oil grades are 20, 30, 40, and 50. The larger the number, the higher the viscosity and the higher the applicable temperature. For example: SAE15W-40, SAE5W-40. The number after “W” indicates the index of the high temperature resistance of the lubricant. The larger the value, the better the protection performance of the lubricant at high temperature. In general, consumers in most parts of the country from April to September can choose summer lubricants No. 15W-40 or No. 10W-40.

At the same time, for high-end cars, it is recommended to choose high-quality fully synthetic lubricants as much as possible. Compared with general mineral oil, synthetic oil has little change in viscosity with temperature, and it can still maintain a proper viscosity at high temperatures.

Lubricating oil is not that the higher the viscosity, the better

Although the viscosity of lubricating oil is very important, car owners should abandon the misconception that “the higher the viscosity, the better”, and choose the appropriate quality level according to the actual vehicle conditions, temperature and engine conditions. Only in the case of a large gap between the parts of the automobile engine, the lubricating oil with a large viscosity should be selected.

Using lubricating oil with excessive viscosity will have at least two disadvantages:

First of all, when the viscosity is higher than the degree that affects the engine start, it is likely to cause serious wear when the engine starts. Because the lubricating oil is too viscous and flows slowly, although the oil pressure is high, the throughput of the lubricating oil is not much, and it cannot be added to the friction surface in time. The oil circulation speed also slows down, and its cooling and heat dissipation effects will become poor, which will cause the engine to overheat. Due to the slow circulation of lubricating oil, the number of passes through the lubricating oil filter is reduced. Therefore, it is difficult to clean the worn-out metal chips, carbon particles, and dust from the friction surface in time.

Another disadvantage of using lubricating oil that is too viscous is energy consumption. Because the viscosity is too high, the friction between the friction surfaces of the parts increases. To overcome the increased friction, more fuel is consumed, resulting in a huge waste of energy. It is understood that low-viscosity lubricants have become an international trend in foreign countries. In China, although there are no compulsory requirements for energy-saving lubricants, low viscosity will be the future development trend.

Summary: In the high temperature in summer, the choice of lubricating oil is also a matter of great care. It is necessary to choose lubricating oil with higher viscosity, but also to abandon the misconception that “the higher the viscosity, the better”. If the choice is not good, the engine will be damaged in severe cases.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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“Registration Measures” to promote the development of the automobile market

The research report of the automobile registration method is reported by the Policy Research Association of China Automobile Manufacturers Association. Among them, the motor vehicle registration certificate with the function of the property right certificate can not be carried with the car, so in principle, it is not possible to conduct reselling fraud. This will not only reduce the car rental price, but also relieve the worries of many companies that want to start a car rental business, which is conducive to the development of the car rental industry. The Association of Automobile Manufacturers or the Association of Automobile Manufacturers will provide compensation to the demanders. The information is provided by the traffic control department for a fee. The “Registration Measures” laid a solid foundation for this statistical work.

Conducive to improving the quality of automobile products and promoting technological progress_Currently, China's policies and regulations are insufficient in promoting the quality of industrial products and technological advancement. Article 50 of the “Registration Measures” stipulates that the vehicle management office can entrust large-scale state-owned automobiles and motorcycles. , The exclusive sales store of the agricultural transport vehicle manufacturer shall handle the registration of the inspection-free motor vehicles produced by the enterprise on behalf of the vehicle management office. The specific measures shall be formulated separately. Only cars with good quality can be exempted from inspection, and cars with exemption from inspection can save vehicle inspection fees before registration. At the same time, dealers can directly apply for car licenses, which can save users the cost of entrusting motor vehicle registration and save money for car users. and time. Therefore, the sales of inspection-free vehicles in specialty stores will inevitably be better than those of non-inspection-free vehicles. It will effectively promote automobile manufacturers to improve product quality, speed up technological progress, and strive for vehicles to meet the inspection-free level as soon as possible.

is conducive to speeding up the process of automobile tax and fee reform. The issuance of motor vehicle registration certificates and the computer networking of motor vehicle registration management in the future provide convenience for the accurate statistics of various domestic motor vehicles according to equipment quality and engine displacement. Therefore, it provides a prerequisite for the future integration with international conventions and the implementation of vehicle tax. The implementation of vehicle tax is conducive to reasonable taxation, thereby promoting the development of the automobile market.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Approximate dry machining benefits from minimal lubrication

With the continuous development and technological progress in the field of metal processing, the concept of green processing has become more and more popular. The traditional lubrication cooling method using cutting fluid is gradually replaced by dry cutting technology. Because dry cutting also has defects for machining, it makes the machining quality drop and the cutting tool wears faster. Micro-lubrication technology emerged at the historic moment. The application of micro-lubrication technology improves the quality of machined parts and reduces tool wear. To a large extent, it solves the impact of dry cutting and will gradually become a technology that is compatible with dry cutting. The application of micro-lubrication technology will gradually replace the cooling and lubricating effects of cutting fluid.

…
The application of oil mist micro-lubrication technology can solve the lack of dry cutting without lubrication, improve the surface quality of processed workpieces under dry cutting conditions, reduce the wear of cutting tools, and extend the service life.

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During metal processing, cooling and lubrication is an important aspect related to product accuracy and quality. While the same product quality can be achieved, the overall processing cost should be reduced as much as possible, and the production efficiency should be improved. For the processing of small-sized parts, the parts themselves have good heat dissipation, and the spraying method using a large amount of cutting fluid is undoubtedly a waste of energy. The application of micro-lubrication technology is to provide the amount of lubrication as needed, avoiding the waste of over-lubrication, and achieving controllable and reduced costs.

…
However, with the increase in environmental protection requirements of industrial enterprises, the impact of the lubrication method of pouring cutting oil on the environment and human health has been paid more and more attention. At the same time, the cost of using cutting oil and the treatment of waste liquid are not small for enterprises. Expenditures also virtually affect the competitiveness of enterprises.

…
Doppelt adapts to the trend of green development in the machinery industry, and continuously introduces micro-lubrication products that meet the needs of various machining processes. The application of micro-lubrication technology in metal processing will bring more benefits to enterprises. We are willing to welcome the green with you. Revolution of manufacturing.

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The traction converter of the high-speed EMU adopts a fully enclosed circulating water cooling system

 

The heat dissipation capacity of the cooling system of the traction converter directly affects whether the converter can work safely and stably for a long time. For the cooling system of the traction converter of the CRH3 EMU, the dimensions and boundary conditions required for model simulation are obtained by actual measurement and dynamic test tests, ensuring the authenticity of the simulation analysis. Using ANSYS/FLOTRAN to simulate the flow field and temperature field of the heat exchanger of the traction converter cooling system in three dimensions. Compared with the previous empirical simplified formula method or experimental measurement method, it avoids the problems of poor calculation accuracy and difficult measurement. The distribution of wind speed, pressure and temperature of the heat exchanger of the cooling system can be easily and clearly obtained. By comparing and designing the temperature change of the coolant inlet and outlet pipes, the heat dissipation power of the converter cooling system is calculated, which provides a reliable basis for the performance evaluation and structural improvement of the CRH3 traction converter cooling system.

Traction converter cooling system structure The CRH3 high-speed EMU traction converter adopts a fully enclosed circulating water cooling system. The cooling system consists of an expansion tank, a water pump, a water-air heat exchanger, a cooling module, a pipeline, etc. The cooling medium is a mixture of high-purity water and antifreeze. Traction converter filter cutoff valve fan heat exchanger, quick connector expansion tank water pump pressure sensor temperature sensor, pressure sensor temperature sensor cutoff valve, traction converter cooling system working principle, the cooling medium is pumped to the main converter by the water pump In the heat exchanger outside the device, part of the cooling medium flows from the heat exchanger to the expansion tank, and the remaining part of the cooling medium flows back to the main converter after being cooled by the heat exchanger, flows into the 8 phase component modules connected in parallel, and communicates with the power device. Heat exchange; then it is pumped out by the water pump, and then pumped to the heat exchanger by the water pump, and so on.

For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Do 3D Printing And CNC Machine Coexist Or Compete?

Many countries in the world have cultivated 3D printing as a new growth point for future industrial development. As early as 2012, the United States identified “Additive Manufacturing Technology” as the first manufacturing innovation center (later renamed “Made in the United States”), and the European Union, South Korea, Japan, Singapore, Russia and other countries also adopted various measures to promote 3D printing China Industry moving forward

Since the rise of 3D printing, China has successively promulgated a number of policies to support the development of the 3D printing industry. With the support of policies, 3D printing companies have sprung up like mushrooms after a rain, and are growing rapidly. The development of the 3D printing industry in Beijing, Guangdong, Zhejiang, Shaanxi and other places has also made significant progress. According to statistics, there are more than 400 companies engaged in 3D printing business in Guangdong Province alone, with multiple 3D printing industrial parks.

With the rapid development of 3D printing, whether traditional subtractive manufacturing methods such as Cnc Machine tools will be replaced has also become a hot topic of discussion among people from all walks of life. In recent years, the technology of China’s CNC machine tools has been improving day by day, and 3D printing has found their own scenes. Generally speaking, CNC machine tools need to program in advance and continuously cut to realize the forming of objects. The working principle of a 3D printer is similar to that of a CNC machine tool, and it also works according to computer instructions. The difference is that it builds products by stacking layers of raw materials. So 3D printing is also called “additive manufacturing.”

The significant difference between 3D printing and traditional manufacturing lies in the process of product molding. In the traditional manufacturing industry, the entire manufacturing process generally needs to be formed through such processes as mold opening, cutting, casting or forging, and component assembly. 3D printing eliminates complicated processes, no molds, and one-time molding. Therefore, 3D printing can overcome some designs that cannot be achieved in traditional manufacturing and produce more complex structures.

On the other hand, CNC machine tools are a type of computer numerical control (CNC), which can process complex, precise, and various parts. Generally speaking, CNC machining tools use computer-designated programs to remove excess materials through laser cutting, milling and other steps to reach the final product, which is a typical subtractive manufacturing.

On the one hand, traditional manufacturing is characterized by “global procurement, division of labor and collaboration”. Different parts of a product are often produced in different places and then shipped to the same place for assembly. And 3D printing is “integral manufacturing, one-time molding”, which eliminates the logistics link and saves cost and time.

On the other hand, the traditional manufacturing industry takes production lines as the core, factories as the main carrier, and highly concentrated production equipment. And 3D printing embodies the integration of a new generation of information technology and manufacturing represented by cloud computing, big data, Internet of Things, and mobile Internet.

As a major product of the development of traditional manufacturing, machine tools are very different from the new generation of 3D printing manufacturing methods. The machine tool is the mother machine of the manufacturing industry. If 3D printing technology can be integrated into the machine tool field, it will undoubtedly be even more powerful. The combination of the two not only improves the production efficiency, but also completes many manufacturing problems.

The special machine tool in the machine tool can be customized with functions according to customer requirements, but the functions are not powerful enough and rich, and may not be designed and manufactured as one wishes. However, with the introduction of 3D printing, the popularity and application of machine tool products may be greatly improved.

It is understood that 3D printing technology has already been applied in China’s industrial parts manufacturing, but has not yet entered large-scale industrial applications. Its process and equipment, as well as applications in medical, aerospace and other fields need to be further developed. Judging from the current situation, 3D printing technology does not have the conditions to replace traditional manufacturing. In terms of mass manufacturing, the high-efficiency and low-cost traditional subtractive manufacturing method embodied by machine tool manufacturing is even better.

Of course, with the emphasis on metal additive manufacturing, more and more equipment manufacturers in the field of traditional machine tool manufacturing have entered the field of additive manufacturing. Some have launched hybrid additive manufacturing equipment based on Cnc Machining centers, and some simply Directly enter the new field of additive manufacturing. For example, Japanese Mazak. Mazak launched the Integrex i-400am (additive manufacturing) compound processing equipment. Integrex i-400am is a complete set of equipment, which is more suitable for processing materials for small batch production, such as the processing of heat-resistant alloys for aerospace parts, and the processing of high-hardness materials for parts.

The long-term coexistence of subtractive manufacturing and growth manufacturing methods is a trend that can be met. However, in the future, this situation may change. In any case, the way to achieve refined, automated, and efficient manufacturing of products will be expected to be diversified.

Do 3D Printing And CNC Machine Coexist Or Compete?

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Give full play to the distribution channels of auto parts companies

Through the development of wholesale business, the auto parts company’s role as a reservoir of circulation channels is promoted to promote the formation of a hierarchical sales network in the auto parts market. Social outlets are mostly small-scale operations, and are restricted by storage conditions and the variety of models and varieties of repair parts. They always hope to obtain small-batch and multi-batch purchase resources from local wholesale companies. In the past two years, our company has maintained a certain share to carry out wholesale business to social outlets. The normal operation of some outlets has been fostered, and the company’s main channel sales market share and market coverage have been increased. Promote the formation of a hierarchical network of auto repair parts market.

In order to further play the role of the reservoir of the main circulation channel, enhance the ability to control the market, ensure supply and sales, and facilitate market management, we summarize the work of the previous stage. In response to these situations, we will focus on market mechanisms in our actual work. , Explore a reasonable balance between the supply and demand of auto parts, establish a supply and demand mechanism suitable for the market economy and its own characteristics, and put forward the following suggestions: Set up a leading group for clean-up and rectification. The auto parts sales industry is entrusted by the government to be responsible for the relevant departments, and the industrial and commercial administration, price management and other departments have been established to participate in the leading group and formulate rectification regulations. Re-examine the business qualifications. Strictly follow the relevant rectification regulations to re-examine the business qualifications of auto parts business units. Regardless of the main or concurrent business units, regardless of their affiliation and economic form, all the original business licenses that have auto parts business content must be designated to clean up. Reorganize registration. First, to regain business qualifications, it is necessary to have business sites and facilities that are compatible with the operation of livestock enclosures and business methods, and potatoes have funds that are commensurate with the scale of business, employees and qualified professional and technical personnel, such as quality inspectors and price member.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Introduction to 5 key points of car maintenance

　　Measure tire pressure

The tire measures every inch of the journey with its own body, which is extremely hard.Therefore, the tire pressure should be measured first to maintain the same tire pressure for all four wheels.If the tire pressure of a certain tire is abnormally low, carefully observe whether the tire is punctured, and repair it in time.If the wound is too large or the wound appears on the wall of the fetus, it can only be asked to retire.

There is also the problem of tire dynamic balance.The rough road in the wild may affect the dynamic balance of the tires. The originally smooth car suddenly seems to lose its temper, with abnormal tremors, which indicates that the dynamic balance of the tires has failed.The reason may be the deformation of the wheel hub, tire wear, or it may be that the balance weight clamped on the wheel hub was shaken off during a strong bump. Therefore, it is extremely necessary to rebalance each tire.

Oil change

During a self-driving trip, high-load operation will make the engine stand the test, so check the engine oil and water tank water.If it is an automatic transmission car, also check whether the transmission oil is missing, and if it is excessively consumed, it should be refilled in time.

If the self-driving trip is relatively long, it is best to change the engine oil, because the engine’s high temperature work for several days may cause the engine oil to deteriorate.And whether the engine belt is loose also needs attention.In addition, the dust during the journey may make the engine body, engine radiator and air-conditioning radiator covered with mud, which affects the engine’s heat dissipation and air-conditioning work. At this time, you need to go to a professional car dealer and use a special cleaning agent to treat the engine and radiator. Carry out special cleaning.

Do 4-wheel alignment

The bumpy road brings continuous impact to the chassis, and the four-wheel positioning of the vehicle may also be changed as a result, resulting in abnormal tire wear.Therefore, after returning from the journey, the chassis of the vehicle should also be checked, and if necessary, the four-wheel alignment should be done again for the car.Similarly, severe vibration can damage the steering system, and you should observe whether the steering gear ball head is loose.In addition, the screws of the chassis part should be tightened.

Check the brake system

The brake system is also an inspection link that cannot be ignored. Frequent braking and gravel-filled environments during the journey will severely wear the brakes.If the brakes are excessively worn, or there is a “hissing” noise when you step on the brakes, then the brakes need to be checked.

Clean the engine oil circuit

There are certain differences in the quality of oil in various regions, and even some of the oil quality is unqualified. Adding such oil will cause great damage to the engine and the oil circuit.If you use inferior gasoline, on the one hand, the engine will produce knocking and noise; on the other hand, it is easy to make the three-way catalytic converter fail. At this time, the engine will often be weak and fuel consumption will increase, which will seriously damage the internal parts of the engine.If the above situation occurs, it is best to go to the after-sales service station to drain the oil, and then add some additives to clean the oil circuit for maintenance.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Three types of vehicle anti-theft alarm

Automobile anti-theft devices developed from the initial mechanical control to electronic passwords, remote control calls for help, and information alarms. Early anti-theft devices were mainly used to control interlocking mechanisms such as door locks, doors and windows, starters, brakes, and cut off fuel supply, and to prevent thieves. Special socket wrench designed for disassembling parts. With the development of science and technology, automobile anti-theft devices are becoming more and more rigorous and perfect, mainly for the protection of the entire vehicle, and constantly launching new products.

three types of vehicle anti-theft alarm

Vehicle anti-theft alarms can be roughly divided into mechanical anti-theft locks, electronic anti-theft devices and GPRS network positioning anti-theft alarms

One, mechanical anti-theft lock

The purpose of anti-theft is achieved mainly by locking the steering wheel and tires. This kind of anti-theft lock only prevents theft and does not alarm, and the anti-theft performance is not thorough. Because of its feature of preventing but not reporting, it is often easy to be damaged by master unlockers, and it is troublesome to disassemble and assemble. Its advantage is that the price is cheap, generally ranging from tens or hundreds of dollars.

The choice of mechanical anti-theft lock is mainly judged by the material of the lock body and the structure of the lock core.

2. Electronic anti-theft alarm

The vehicle electronic anti-theft alarm mainly relies on locking the ignition or starting, and the vibration sensor alarm to achieve the purpose of anti-theft. It also has anti-theft and sound alarm functions. Electronic anti-theft alarms are mainly controlled by remote control. The current electronic anti-theft devices on the market are mainly divided into one-way remote control and two-way interactive remote control. One-way remote control anti-theft alarms are equipped with vibration detection door control protection and microwave or infrared probe functions. In addition, many convenient and practical additional functions have been added, such as: remote central control door lock, remote control of heating and cooling air, remote control of electric doors and windows, and remote opening of the luggage compartment. The two-way electronic anti-theft device has all the functions of a one-way anti-theft device. In addition, within a certain distance, it can not only control the vehicle by the owner, but the vehicle can also transmit its own status to the owner through the LCD display on the remote control. For example, which side of the car door is opened or the window glass is broken.

but. The installation of the electronic anti-theft alarm is more complicated, and the vehicle circuit needs to be disassembled and assembled, which is likely to cause damage to the vehicle circuit. Due to the use of infrared and microwave control, the effective distance between control and alarm is short; many car thieves use wireless signal detectors to detect vehicle control signals and then simulate and crack the anti-theft system.

The advantage of the vehicle electronic anti-theft alarm is mainly the anti-theft alarm capability, which can serve as a reminder to the owner within a certain distance.

Three, GPRS network positioning anti-theft alarm

Vehicle GPRS network positioning anti-theft alarm adopts *advanced global positioning system to track the vehicle 24 hours a day. When the position of the vehicle moves, it will immediately send an alarm signal to the vehicle owner's mobile phone to remind the vehicle owner. The location alarm also has the function of checking the location of the vehicle, driving track and emergency alarm at any time. Your family can check your location at any time. You can also make an emergency alarm when you encounter robbery and other dangers. Due to the GSM telephone alarm, the alarm signal is stable and not limited by distance. These features are unmatched by traditional mechanical anti-theft locks and electronic anti-theft systems.

Common troubleshooting of vehicle anti-theft alarm

The use of car anti-theft alarm system is realized by the power of the car and some circuits of the car itself. Once the anti-theft device fails, it will affect the normal use of the vehicle. This article analyzes the causes of some common failures and introduces the treatment methods, most of which can be handled by the user by referring to the solution.

Example 1. Trouble phenomenon: The remote control operation does not work. When you press the function buttons of the remote control, the red LED indicator of the remote control does not light up.

Cause analysis: This fault is mostly in the remote control itself, and there are the following situations: (1) the battery is exhausted; (2) the positive and negative reeds of the battery are rusty or have poor contact; (3) the remote is exposed to rain or Water, oil immersion, etc. In this regard, the circuit board can be taken out, cleaned with industrial alcohol, dried with a household electric hair dryer or after it is naturally dried, it can be used.

Example 2. Trouble phenomenon: The remote control distance is getting shorter and shorter. When transmitting a signal, the LED brightness of the remote control becomes dim or flickers.

Reason analysis: This phenomenon is mostly low battery power, just replace the battery. In addition, it is recommended not to adjust or replace the components of the remote control yourself to avoid greater losses.

Example 3. Trouble phenomenon: A function key of the remote control fails, and the LED indicator does not light up when the key is pressed.

Reason analysis: a certain function key fails (other function keys are normal) mostly because the function key is damaged or the solder joints between the key pins and the circuit board are unsoldered. The buttons of the remote control are mostly micro-switches. In normal use, you should use light force and pay attention to waterproof, anti-drop and heavy pressure.

Example 4. Trouble phenomenon: When the remote control is not used, the LED indicator often lights up by itself, or as long as the battery is installed, the LED indicator is always on, and there is no response when operating the remote control.

Cause analysis: The indicator light often lights up when the remote control is not pressed, usually because the remote control's buttons are mechanically damaged. The button feels bad and has no elasticity, just replace the button. For the code-hopping remote control, there is no response when pressing the function keys of the remote control. After replacing the battery or reinstalling the battery, the LED indicator lights up for 20-40 seconds, and then there is no response. This shows that the keys are short-circuit damaged. If the hand feels no abnormality, you can test the keys on the road with a multimeter in R×1 gear, and then replace the short-circuited keys.

Example 5. Failure phenomenon: The vehicle will automatically turn off and enter the alarm state after driving for about 30 to 40 seconds. After the anti-theft function is released, the above situation will be repeated during driving, and so on.

Reason analysis: This phenomenon is caused by operating the remote control in the car, which causes the second automatic anti-theft. The problem can be solved as long as the door is opened and closed again after pressing the anti-theft function key. The remote control for car anti-theft system is limited by volume. Generally, there are no more than four function keys. In this way, each key is often assigned several functions. In a certain state, the function controlled by the same function key is different, or a certain function has multiple functions. The keys are coordinated to complete, so special attention should be paid when using them.

Example 6. Trouble phenomenon: The vehicle is in the anti-theft state, use the remote control to release the anti-theft failure.

Reason analysis: The system in the anti-theft state, due to the failure of the remote control or the system main unit (mostly the main unit is the remote control receiving circuit failure), the anti-theft is cancelled (the remote control loses control of the system), and the car direction light (double jump light) flashes , The alarm horn often buzzes, and the vehicle cannot start driving. At this time, the anti-theft system can only be temporarily removed, which requires users to pay attention to the general installation position of the anti-theft system host. If you don't know the location of the anti-theft device, you can find the system host according to the anti-theft system’s LED indicator, ultrasonic sensor probe or alarm horn and other components, and unplug the connector that connects the anti-theft system host to the vehicle. In addition, some remote control car anti-theft alarm system mainframes are equipped with an emergency release function, and the use of the anti-theft device can be suspended without dismantling the system mainframe.

Example 7. Trouble phenomenon: The car anti-theft system works normally, the ignition motor works normally, but the vehicle cannot be started.

Cause analysis: This phenomenon may be caused by a malfunction of the alarm or the car itself. The judgment method is: cut off the two thick wires of the ignition relay (12V/30A, usually placed near the car key door) of the car anti-theft device accessory. If the vehicle can start at this time, it means that the anti-theft system is faulty, and most of them are relays. damage. If the vehicle still cannot start after short-circuiting and cutting off the two thick wires of the ignition relay, it means that the vehicle’s own circuit is faulty. In addition, when the vehicle encounters a bumpy road during driving, it is easy to extinguish or instantaneously extinguish. Special attention should be paid to whether the normally closed contact of the cut-off ignition relay has poor contact and loose wiring.

Example 8. Trouble phenomenon: When turning on one side of the car, the other side also lights up.

Reason analysis: This fault is the breakdown of the diode of the anti-theft system to control the voltage output of the car’s direction light (double jump light) (in some models, the two diodes are inside the host, and some are attached to the connection). Replace the diode of the same model to eliminate Fault.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Measures to reduce NO and particulate emissions at the same time become internal combustion engine research

 

In order to meet increasingly stringent emission regulations, especially the restrictions on diesel engine particulate and NO emissions, seeking measures that can simultaneously reduce NO and particulate emissions has become an important topic in internal combustion engine research. For diesel engines, it is usually used to delay fuel injection, increase fuel injection rate, high pressure injection, common rail injection system, pilot injection, multiple injection, premixed compression ignition, EGR (exhaust gas recirculation) and exhaust gas aftertreatment technology to reduce NO and particulate emissions. It is an effective way for diesel engines to use alternative fuels to reduce particulate and NO emissions. The application of alcohol fuels (such as methanol, ethanol) to diesel engines can significantly reduce NO and particulate emissions. *New research has found that dimethyl ether is a more suitable alternative fuel for diesel engines. The test results of AMOCO and Hal-Dimethyl ether on a variety of diesel engines show that dimethyl ether can achieve engine high efficiency, ultra-low emissions, soft and smokeless combustion, and can meet the most stringent European III and California Of ultra-low emission vehicles. The performance and combustion characteristics of the engine fueled with dimethyl ether are studied, and the influence of the main parameters of the combustion system on the engine performance is studied.

Fuel characteristics (1) Dimethyl ether is the simplest ether compound with molecular formula 3. The main physical and chemical properties of dimethyl ether and diesel are compared. There are only CH and CO bonds in the molecular structure of dimethyl ether, and no CC bonds. In addition, it is an oxygen-containing fuel, which helps to reduce the smoke and particles generated by combustion; at the same time, it can use a greater exhaust gas recirculation rate (EGR) , To reduce NO emissions. (2) The low calorific value of dimethyl ether is only 64.7% of diesel. In order to achieve the power of diesel engine, the circulating fuel supply of dimethyl ether must be increased. (3) The cetane number of dimethyl ether is higher than that of diesel and much higher than other alternative fuels. Therefore, it is not necessary to take combustion-supporting measures when using dimethyl ether in diesel engines. (4) The saturated vapor pressure of dimethyl ether at normal temperature and pressure is 0.5MPa. As the temperature increases, its saturated vapor pressure increases. In order to prevent the occurrence of air lock phenomenon, the pressure of the fuel supply system is much higher than that of the diesel fuel supply system. 2% castor oil is added to dimethyl ether to increase the lubricity of the fuel, but pure dimethyl ether is used in the emission test to eliminate the influence of lubricants on emissions.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Advantages of five-axis machining of aluminum alloy parts

Aluminum alloy is a very good material for parts. Its low density can achieve lightweight parts and its strength is very high even comparable to steel. In addition, its corrosion resistance, electrical conductivity and thermal conductivity are very good. But there is a major defect that precision machining is very difficult, but the emergence of five-axis machining technology has solved this problem well. Today, let’s take a look at the advantages of five-axis machining of this aluminum alloy part.

1. Reduce processing time

Table of Contents

• 1. Reduce processing time
• 2. Improve processing accuracy
• 3. High production efficiency

In the processing, the flat-bottomed end mill is used to maintain the vertical surface of the complex mold processing surface, which can greatly reduce the processing time. It is also suitable for side milling with angled surfaces, which can eliminate the rib-like shape caused by the spherical end mill processing. The texture makes the surface quality of the aluminum alloy mold more ideal and reduces the workload of manual milling and manual work required to clean the mold surface.

2. Improve processing accuracy

Through this technology, the problem that the workpiece needs to be repositioned at a complex angle and needs to be debugged multiple times can be solved not only shortens the time, but also greatly reduces the error generated, and the large cost of tooling and fixtures required when installing the workpiece It also saves money and the machine tool can also add complex parts, such as the drilling taper processing cavity recesses required for complex surfaces, which cannot be achieved by traditional methods.

3. High production efficiency

It can effectively reduce the processing time and auxiliary time of the parts. The range of the spindle speed and feed rate of the linkage machining center is large, allowing the machine tool to perform powerful cutting with a large amount of cutting. At present, when this technology is entering high-speed machining, the rapid movement and positioning of moving parts And high-speed cutting reduces the turnaround time of semi-finished products and improves production efficiency.

In addition, this kind of five-axis machining equipment for aluminum alloy parts is relatively easier to realize intelligence. At present, network-based mobile control methods such as tablet computers, mobile phones and wearable devices will become more and more popular. This type of operating device can quickly react to switch screens, uploading or downloading data, and significantly reduces the misoperation rate. Compared with traditional three-axis and four-axis machine tools, this kind of five-axis linkage equipment is undoubtedly more capable of achieving automation.

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Introduction to the reasons and solutions for the lack of sealing of car windows

　　After the window glass is damaged, use glass with the same curvature as the original window glass, and check the glass guide groove and sealing strip for damage.Since car windows often fail to return to their original shape after being repaired, in addition to ensuring that the car window glass can be easily pulled or raised and lowered at this time, attention should also be paid to the sealing around the car window glass after the car window is closed.

 

When changing the roof, apply a layer of conductive sealant on the periphery of the roof. After the welding is completed, apply hemming glue all over the water trough and at the joints. This will not only help seal the body, but also It can also prevent the body from water accumulating at the weld seam due to flanging

and produce early rust. When assembling the door, paste a whole sealing isolation film on the inner panel of the door below the window. If there is no formed sealing isolation film, it can be replaced by ordinary plastic paper, and then the sealing isolation film is pasted and compacted. Production and assembly of interior trim panels.

When repairing a car door with a sealing flange, attention should be paid to repairing the damaged sealing flange and accurately restoring the shape of the original flange.After repairing the car door, check the leak tightness. The check method is: put a piece of hard paper on the sealing position, close the door, and then pull the paper to judge whether the seal is good or not according to the pulling force.If the force required to pull the paper sheet is too large, it means that the seal is too tight, which will affect the normal closing of the door, and will also cause the seal to lose its sealing performance quickly due to excessive deformation; if the force required to pull the paper sheet If it is too small, it means that the seal is not good, and the door will often block the wind but not the rain.When replacing the door, be sure to apply hemming glue on the flanging occlusion of the inner and outer panels of the new door, and block some small craft holes left during punching with the base tape.

When repairing the car circuit, the sealing rings of all the body holes and holes through the wiring harness should be installed in place, because these sealing rings not only play a sealing role, but also play a role in protecting the wiring harness.If the sealing ring is damaged or the wiring harness can rotate or move in the sealing ring, replace the sealing ring and assemble it firmly with the holes and holes of the vehicle body to stabilize the wiring harness.

When replacing the entire car body, in addition to completing the above items, a layer of sealant should be applied to the overlapped part and solder joints of the weld. The thickness of the adhesive layer should be about 1mm, and the adhesive layer must not have any virtual stickiness. , Bubbles and other defects; apply special edge-folding glue at the edge; apply 3mm-4mm elastic coating and anti-corrosion coating on the entire lower surface of the floor and the lower surface of the front wheel cover; on the upper surface of the floor and the front stand The inner surface of the board should be pasted with sound insulation, heat insulation, vibration reduction and damping film, and then covered with heat insulation felt, and then covered with carpet or decorated floor.These measures can not only greatly enhance the airtightness of the vehicle and slow down the corrosion rate of the car body, but also greatly improve the ride comfort.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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The foundation of the anti-force roller test bench of the automobile is modified

Based on the traditional counter-force roller test bench used to measure cars without anti-lock brake system, it is modified. In order to increase the speed of the roller, the output shaft of the motor is directly connected to the roller shaft, and at the same time, the supporting wheel and the supporting wheel are set. It can be raised and lowered vertically along the guiding device. When pressed, the supporting wheel is driven to rotate by the wheel. After the measurement is completed, the restoring of the supporting wheel is realized by a spring.

Measuring parameters In this measuring device, measuring parameters mainly include four parts: wheel speed v body speed v, braking torque, load W. According to the working principle of ABS, the purpose of ABS is to automatically adjust the braking force of the brake to make the wheel slip rate S It is within the optimal range of 10% to make full use of the peak adhesion coefficient of the road surface and improve the braking effect of the car. Therefore, the wheel slip rate when the car is braking is an indispensable output parameter, but due to the slip rate S It cannot be obtained directly, but can only be obtained by calculating wheel speed and vehicle body speed. In order to obtain the ground braking force and ground adhesion coefficient of the car intuitively, the braking torque of the braking state must be measured; in addition, because the braking force detection technical requirements are based on the percentage of the axle braking force to the axle load, the total mass is different. It is a relatively objective standard for the automobile, therefore, the synchronous measurement of the automobile load is essential.

Adopt the sensor and its arrangement. Although the speed sensor can use a non-contact speed sensor for the body speed, it is costly and technically complicated. In order to reduce the cost of the test bench, the main drum linear speed (motor output speed) is used to approximately replace the body speed within the allowable range of error; The bench only needs to measure the wheel speed. The wheel speed sensor adopts a magnetoelectric sensor. The sensor gear mounted on the wheel shaft rotates with the wheel shaft, and the wheel speed sensor outputs an AC signal. The input amplifier circuit amplifies the AC signal into a rectangle. And send it to the arithmetic circuit after shaping. For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Auto parts drive a new strategy for reasonable implementation of calibration

The question of where the standards implemented for auto parts are marked is actually clearly stipulated in the “Regulations on the Implementation of the Standardization Law” and the “Product Marking Regulations”. Article 24 of the “Regulations for the Implementation of the Standardization Law” stipulates that the standards implemented by the products produced by enterprises should be marked on the product or product manuals and product packaging.

Article 5 of the “Product Marking Regulations” requires that, in addition to product instructions, product labels should be marked on the product or product sales package: Article 3 requires that laws, regulations, regulations and mandatory national standards and industry standards If there are other regulations on the labeling of the logo, the regulations shall be followed at the same time.

Carefully understand the provisions of the above laws and regulations, we can come to the following conclusions: **, product identification (here refers to the standards implemented by auto parts) should be marked on the product, or the product’s sales packaging soil, or the product manual. Second, the product labeling is marked by the manufacturer’s choice of labeling method. The choice on the product, the sales packaging soil, and the manual _L are all legal, and you can choose one of them. Third, under special circumstances, if the product has special regulations, rules, and mandatory standards, and there are special requirements for labeling the implementation standards, the company should comply with it at the same time.

Some auto parts are very big, some are very small, and there are tens of thousands of kinds. Which must have standards, must mark the standards implemented. We know that automobiles are composed of tens of thousands of parts. In the production process of automobiles, raw materials are first processed into parts, assembled into parts and assemblies, and then formed vehicle.

Many parts and components only have production technology and processing technical conditions in the production process, but there are no standards. These parts and components only exist in the production enterprise and will not exist or circulate as independent parts in the market, so there is no need for these parts By formulating separate standards, companies can rely on internal quality management and quality control to ensure their quality.

Another part of the auto parts, due to the wear, aging, and consumption of the car during use, needs to be used separately in the car after-sales service. Automobile production companies need to prefabricate and reserve these parts and distribute them to their own or social automobile service departments for after-sales repair and maintenance. At this time, these parts and components have become circulated commodities and should be produced and sold in accordance with relevant standards.

China's “Standardization Law” and “Standardization Law Implementation Regulations” stipulate that “the following technical requirements that need to be unified shall be standardized: (1) The variety, specification, quality, grade or safety and hygiene requirements of industrial products: (2) Industrial The methods of product design, production, inspection, packaging, storage, transportation, and use. “It can be seen that the auto parts delivered by auto manufacturers to auto repair and maintenance units have become independent products. Standards should be formulated and they should be marked in accordance with the law. The standard on which the production is based.

Our company also directly imports automotive mold parts from abroad for use in car service. Sometimes we also purchase auto parts imported by them from domestic dealers (manufacturers). What are the regulations for implementing standard labeling of these parts? The auto industry has a kind of inertial thinking, because there are many imported models of well-designed vehicles. I thought the imported things were good things. Indeed, most imported auto parts are good things. However, Chinese companies lack the awareness of standards when buying imported products. Although some products are imported, domestic companies have not yet fully understood the standards for imported products. If there is a dispute over the quality of imported cars and parts, their standards will become The problem.

If the auto parts should be marked with the implementation standard and our company does not indicate the level of punishment according to which laws and regulations, the auto parts should be marked without the implementation standard, and the company will be subject to corresponding administrative penalties.

Conclusion Although the issue of implementing standards is marked on the products produced, there has been controversy in the revision of the Standardization Law. But the author believes that companies will not run into trouble if they act in accordance with current laws and regulations. Enterprises strengthen the standardized management of auto parts and make clear the implementation standards of parts and components, which is beneficial to the protection of the enterprises themselves and the protection of auto consumers.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Qualitative Analysis of Comparing Heat Dissipation of Radiator with Engine Heat Dissipation

Calculated according to the results of the radiator performance test, it can be calculated from the engine parameters, so the installation efficiency of each basic car model can be calculated. When designing an improved design or a modified car design, the cooling constant can be calculated with a known tool. The installation efficiency is obtained from the test, which is closer to the actual situation, while the cooling constant can be directly calculated and compared with the test result. This can quantitatively analyze the cooling capacity of the cooling system, replacing the previous qualitative analysis that approximates the comparison between the heat dissipation of the radiator and the heat dissipation of the engine. To this end, a cooling performance calculation program was compiled, as an example, to illustrate the calculation method of L cooling performance, and compare it with the test results.

Cooling system design calculation and test comparison example In the design of the rear passenger car, the above-mentioned arrangement is adopted. In the calculation, it has the same engine and similar engine system arrangement. Therefore, the installation efficiency can be calculated first according to the results of the cooling performance test, and the cooling constant can be calculated by quoting it in the design one calculation. The cooling performance test is carried out on the drum test bench, and the calculation result and the cooling performance test comparison table are compared to the cooling performance calculation and the test result. ：The calculated value of the lJ constant l test value of the rotational speed ambient temperature cooling is compared with the test results, which shows that the new cooling performance calculation method is closer to the test value, which more truly reflects the cooling performance, and can be used in future cooling system design widely used.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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