2022年3月8日火曜日

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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2022年3月7日月曜日

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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2022年3月6日日曜日

“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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2022年3月5日土曜日

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.


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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