Regarding automatic start-stop, the mainstream cognition must be: automatic start-stop is a technology launched by car companies in response to environmental protection policies, and it will not really save a lot of gasoline in actual combat. Therefore, it is not very practical, and the owner can choose to turn off this function. After this function is turned off, the battery life of the vehicle will be prolonged.
But if the “automotive engineer” told you: automatic start and stop will not affect the battery life, would you believe it? It may not be easy for you to find a “serious car guy” in the short video self-media where dragons and snakes are mixed and people and ghosts are indistinguishable. But if a big V tells you that he was a “former car engineer”, would you shake your judgment?
“Former engineer” talks about automatic start and stop
Saying “fear of hurting the battery” is a low-grade car
High-end car start-stop function does not rely on battery
Recently, a friend forwarded me a few car technology explanation videos, and the author of the video is such a “former car factory engineer”. He claims to have worked in a large well-known OEM. Now he runs his own car media studio (give him some face, and don’t tear his face to reveal his identity). ——He said: Automatic start and stop will not affect the battery life!
He even claimed that those automatic start-stop systems that would shorten battery life, vibrate, and provide poor comfort were actually found in “low-end cars” and “older cars.” Now the new car, as long as the grade is slightly higher, the automatic start-stop system will not cause any damage to the battery. The implication is: you are afraid that the automatic start-stop system will damage the battery, and you think about turning it off every day because your car is too low-grade and you are too poor! Can’t sell a good car…
According to him: the “automatic start-stop system” of those high-end cars is very advanced, which can ensure that when the engine is stopped, the piston is just in the middle of the cylinder, so only fuel injection is required when starting again, and there is no need to rely on the battery when starting. Therefore, the automatic start-stop system of this type of vehicle does not hurt the battery life.
Therefore, he gave the following summary: If you are worried that the automatic start and stop of your car will damage the battery, or you always feel that the automatic start and stop work, the vibration and frustration are strong, then it only means that your car is not high enough, or the model is too high. old. ——Then does his appearance claim stand up? Today I’m going to give him a blow to the head! Criticize him!
The truth: What he calls a “premium car” system
It’s actually a Mazda i-stop system
In fact, in his mind, the automatic start-stop system that “doesn’t hurt battery life” as “very expensive, high-grade, and very new” is Mazda’s patented i-stop system. ——Because among the many legends about the Mazda i-stop system, there is such a saying that has been talked about by car enthusiasts for a long time:
Mazda uses precise control technology to accurately read the crankshaft angle sensor signal, and the computer can accurately determine the position information of each piston of the engine. As a result, the engine is “accidentally” stopped at the “most suitable angle”, that is, the piston has just finished the compression stroke, and then enters the stroke stage of ignition work. At this time, the engine does not inject fuel and does not ignite, and the piston is just in the middle of the cylinder. .
Then when you want to start the engine, you only need to inject fuel into this cylinder and ignite at the same time, then this cylinder will be “awakened” instantly. In this way, the start-stop action can be completed without a motor (starter). Of course, it will not waste the life of the battery! In addition, the i-stop system has very little vibration due to its fast start-up speed, and often the driver does not even notice it if he is not paying attention.
Mazda’s i-stop system doesn’t rely on batteries?
Big mistake! It needs battery + motor
However, in fact this interpretation has always been wrong! The Mazda i-stop system does use a special “piston position precise control” idea, but it doesn’t mean that the motor (starter) is completely unnecessary. ——It is difficult to start the engine smoothly by simply relying on fuel injection + ignition!
In the official explanation of Mazda’s i-stop system, it is actually very detailed. Compared with the ordinary start-stop system of other brands of cars, the i-stop system does use a special “piston position precise control” idea, but the motor ( starter) is also present. And the start-stop process, the motor is involved.
In addition, in order to make the engine easier to start, the i-stop system opens the throttle valve in advance before the engine starts to ensure that each cylinder can quickly inhale air at the moment when the engine starts to speed up the starting speed. According to Mazda’s official test conclusions, the i-stop system can complete the engine start in 0.35 seconds.
We-media authors are mixed
Advise the media not to make mysteries
So obviously, the “former car factory engineer” on a certain tone, his knowledge of Mazda’s i-stop system is seriously insufficient! Although the Mazda i-stop system can start the engine faster, smoother and quieter, it is definitely not as mysterious as he described!
On the other hand, for cars equipped with Mazda’s i-stop system, the battery is still a dedicated battery for automatic start and stop (AGM battery). This actually means that Mazda officially told you that the i-stop system, like the start-stop system of other brands of cars, requires a high-current special battery (the current of the starter motor is much larger than that of the car without the start-stop function). Some folks replaced Mazda’s AGM batteries with ordinary batteries, but found that the batteries were useless soon. So where did you say “do not hurt the battery”?
In an era of mixed media authors, how to choose to accept credit has simply become a difficult problem for car owners. Especially when we’re dealing with a “former car factory engineer”. We very much welcome automotive science, but we prefer that automotive media authors follow basic physical principles and facts when publishing content. In order to be unconventional and eye-catching, there is no need for it!
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