How does the throttle of a car control the speed?

The traditional cable throttle is a steel wire with one end connected to the accelerator pedal and the other end connected to the throttle, and its transmission ratio is 1: 1. That is to say, the opening angle of the throttle is the angle we step on with our feet, but in many cases, the throttle should not be opened at such a large angle, so the opening angle of the throttle at this time is not necessarily the most scientific. Although this method is direct, its control accuracy is poor. The electronic throttle controls the opening of the throttle through cables or wire harnesses. On the surface, the traditional throttle cable is replaced by cable, but in essence it is not only a simple change of connection mode, but an automatic control function for the power output of the whole vehicle.

Throttle is actually a "valve" on the engine, which is a device to control the intake air flow. The normal combustion of the engine requires an appropriate air-fuel ratio. The so-called throttling means controlling the flow of air. Knowing the amount of air, we can know how much fuel is needed. Of course, all this is done by the computer in the car. When you step on the accelerator, the air flow increases, the fuel is injected more, and the explosive force generated by combustion is greater, so the engine speed is faster, and vice versa!