In fact, our own grocery cart can also start at idle speed, which is not a profound skill; Theoretically, controlling the clutch to complete the start (without stepping on the accelerator) is the most ideal way to start, because this way is the most harmful to the clutch, but from a practical point of view, this way is simply stupid, because the clutch is faster and even the veteran will turn off the fire; Therefore, after we leave the driving school to start the vehicle, we often cooperate with a pedal, which makes it easier to push the vehicle out and reduce the difficulty of starting!
As shown above, this is a structural diagram of a manual transmission. The clutch is disengaged (pedal down) and connected (foot up), so when we lift the clutch pedal, it is actually connected; So the engine power at this time, and whether it can overcome the self-weight of the vehicle and complete the start is very important! In this process, when we put the pedal down, the speed is pulled to about 1000 rpm, and the output torque of the engine becomes larger, making it easier to start! Only in this way can the speed difference be greater (the left and right clutch plates rotate on the left and the right are stationary), so idling is the most scientific and stupid way to start!
In fact, the test center of driving school does not need to step on the gas pedal. When I was learning to drive, I was not allowed to give oil, even on slopes. I'm concerned about semi-linkage control. As for the idle speed of the driving school car, it must be increased because it is a carburetor car! The purpose of increasing idle speed is to reduce the difficulty of operation. It doesn't mean that you can't do it without increasing the idle speed. Only if the idle speed is not increased, the clutch will stall if it is not well controlled. Of course, you can still get started if you control it!
The current coach car does not adjust the idle speed. In the past, carburetor cars had good idle speed adjustment ability. Second, the current coach cars are all EFI machines (manifold and direct injection belong to electronically controlled injection engines). Although the idle speed can be adjusted, it needs computer adjustment, which is difficult to operate and easy to cause other mismatches, so the current coach cars generally do not adjust the idle speed! As for why you can walk without stepping on the accelerator, in other words, it seems easier than a family car. A car is also easy to use, but you can give oil after learning to drive. Who will insist on starting with clutch?
So the family car can actually walk without stepping on the accelerator, just the feeling of some friends; From another point of view, the light weight of vehicles in the carburetor era is very poor, and any vehicle can reach about 1.7 tons, but the power performance is not ideal. It is really difficult to start without increasing the idle speed and lifting the clutch. Today, things are different. Driving school cars are generally around 1.2 tons, and the power is higher than in the past. Driving schools do not need to increase the idle speed, which is convenient for operation! In the same way, a family car can walk without stepping on the accelerator, but few people will use this method!