If the speed of the N gear is a little higher, such as 2000 rpm, and then directly hung up to the D gear, what will happen to the car? Will it eject to start or simply scrap it?
I tell you, neither ejection nor scrappy, but a little faster than usual.
I did this stupid operation two days ago. Stop and wait for the red light, the waiting time is a little long, I will casually hang the stall to the N gear, and then pick up the mobile phone to read the information.
Before I could finish reading it, I heard the horn behind me, and I looked up and saw that it had turned green. I quickly stepped on the accelerator to start, and I heard the engine roar, but the car stopped in place. I realized I wasn't hanging up yet!
As the saying goes, "people are too busy to be wise". I was a little dazed, my foot was still on the accelerator, and my right hand pulled the gear down in D gear. Then it was obvious that the engine speed had slowed down, and the car first paused, and then started quickly. The whole process was slightly faster than the normal start, but it was still relatively smooth, there was no particularly strong sense of frustration, and the engine and gearbox did not have any abnormal noise.
Some people say that this method of pulling up the speed and then hanging up the gear to start is not the starting point of the catapult? Not really. The ejection start is to hang the gearbox in D gear, and then the left foot presses the brake, the right foot presses the accelerator pedal, increases the engine speed to more than five thousand revolutions, and then suddenly releases the brake pedal, at which time the wheel will get the maximum driving force, the car will start at the maximum acceleration, and then reach the maximum speed in a short period of time.
But for our ordinary family car, the ejection start is turned off by default, or it is simply not allowed. Today's cars are set up with corresponding protection programs to prevent overloading of the power system. When the engine electronic control unit detects that the driver has an ejection start operation, it will directly command the traction control system to reduce the engine speed, reduce the engine output torque, and avoid the car ejection starting to damage the transmission system.
For example, my operation, the engine speed has exceeded three thousand revolutions when it is neutral, and the speed of the engine has immediately decreased to less than two thousand revolutions after being hung into the D gear, and even if the foot is still on the accelerator pedal after starting, the car does not accelerate violently, but it feels slightly faster than usual. In this case, there is no harm to the engine or the gearbox, and the gearbox will not be scrapped.
In some automotive test programs, in order to maximize the acceleration of the car, the engine traction control system and the electronic stability control system are generally turned off, and the gearbox is attached to the sport or manual mode. Even in this case, many cars are not allowed to eject to start. Because the damage to the transmission system of the ejection start is very large, the model that allows the ejection start is also limited to the number of ejection starts, and every time the ejection starts, the engine computer will record it, and the number of times is not allowed to operate like this.