With the increasingly strict environmental protection requirements, energy-saving and emission reduction has become a factor that cars are gradually being valued. More and more cars are beginning to be equipped with automatic engine start-stop technology. This technology is especially suitable for urban road conditions. When the red light is waiting for the engine to be temporarily turned off, the fuel consumption caused by idle speed can be saved. As with all new technologies being installed into the product, the engine's automatic start-stop technology is also subject to many questions.
What is the engine automatic start and stop technologyLiterally, it is a system that can automatically control engine flameout and ignition. English is called STOP&START, or STT for short. Vehicles equipped with automatic engine start-stop technology will automatically turn off when temporarily parked while driving. The system automatically restarts the engine when it needs to move on.
Its core is automatic control of flameout and start-up, which minimizes engine idle idle time to reduce unnecessary fuel consumption and reduce emissions to improve fuel economy. In order to ensure the comfort of the passengers, after the engine is turned off, the battery will replace the pulley to provide operating power for the engine cooling fan and the interior air conditioner.
If you want to know if the engine's automatic start-stop technology is harmful to the car, we have to start with its principle.
When the vehicle stops traveling due to congestion, the driver depresses the brake pedal and picks up the gear, and the vehicle is stationary. At this time, the automatic start-stop system starts self-test. When it finds that the engine is idling and there is no gear, the wheel speed sensor reads zero, so it continues to check if the vehicle has enough power for the next start. When the above conditions are met, the engine will automatically stop working. After a while, you have to leave, so you release the brakes, step on the accelerator pedal, and the engine will re-ignite immediately.
The idea of ​​engine start-stop technology has been around since the 1930s, and the application of the car dates back to the 1970s. At that time, Toyota had carried out a practical test of similar technology on the Crown sedan. When the vehicle stopped for 1.5 seconds, the engine would automatically cut off the oil and extinguish the flame. This can be said to be the prototype of the automatic start and stop technology of the engine. In the 1980s, Volkswagen and Fiat will produce their cars, but it was not until 2006 that automatic start-stop technology became popular.
Is the automatic start-stop technology damaged the engine?Most of my friends around me have questions about this issue. Some people think that the automatic start and stop function is best not to use, because frequent other causes the piston to wear, and the resulting metal debris will also wear other key components of the engine. Over time, the damage to the engine is great. It sounds like this is the case, but think about it, don't worry so much.
Frequent start-stop engines are indeed a big deal of engine wear, but they all ignore the fact that most of the engine wear occurs when the cold car starts. More than 80% of the wear of automobile engines comes from the moment of cold start, and the normal idle running wear accounts for about 20%. The environment for automatic start-stop work is a hot start, but the engine is temporarily turned off during a short stop. At this time, the engine temperature is still high, the oil viscosity is small, the fluidity is strong, and it is easy to adhere to the parts. The wear at this time will not be great.
Battery and starter maintenance costs are higherAlthough there is not much damage to the engine, the engine automatic start-stop technology still has its drawbacks. Frequent start and stop of the engine can cause damage to related components such as starters and batteries. Although the car with the automatic start-stop system will use the enhanced starter and battery, in actual use, their failure will be higher than the ordinary vehicle without the automatic start-stop system.
At the same time, the enhanced starter and battery maintenance costs will be higher than ordinary starters and batteries. This brings about a problem of high maintenance costs. In addition, since the engine frequently starts and stops repeatedly, this has higher requirements on the quality of the oil, and the maintenance cost is further increased.
The design of the automatic start-stop system is different for different models of each brand. The start-stop logic of some models is not very good, the intervention time is not allowed to be fixed, sometimes the long-term parking start-stop system does not move, and the one-stop brake at the toll booth when the card is swiped makes it uninvited. In addition, the noise and vibration at the start is large, which is also a shortcoming of the occupants.
In addition, if there is a serious traffic jam, the engine stops working for a long time, the combustion chamber temperature decreases, and the incompletely burned carbon hydroxide and paraffin will form carbon deposits attached to the inner wall of the cylinder. If the oil is not good, the situation will be more serious. Carbon deposits will increase fuel consumption and weaken power. This is an automatic start-stop function designed to reduce fuel consumption, which in turn increases fuel consumption.
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