There are no idle motors in cars and electronic throttles, so how can we idle?

Throttle is the most important component in today's EFI automobile engine system. Its upper part is the air filter, and the lower part is the engine block, which is the throat of the automobile engine. In the electronic throttle control system, the conventional mechanical control system connected with the accelerator pedal is not adopted, and the control system adopts the fly-by-wire control technology used in aircraft, which is rarely used in automobiles at present and is only used in some concept cars. The basic structure of the electronic throttle system consists of the following parts: 1, engine 2, speed sensor 3, throttle position sensor 4, throttle actuator 5, throttle 6, accelerator pedal position sensor 7, speed sensor 8, transmission 9, accelerator pedal 10 and throttle electronic control unit (ECU), in which the speed sensor can also be replaced by crankshaft position sensor or camshaft position sensor; The throttle actuator is a stepping motor, which pushes the throttle to control the opening of the throttle; The structure and working principle of the accelerator pedal position sensor are the same as those of the accelerator pedal position sensor. The throttle electronic control unit is usually manufactured together with the engine electronic control unit. The working principle of the electronic throttle control system is shown in the above figure. The accelerator pedal position sensor (6) transmits the information that the driver needs to accelerate or decelerate to the accelerator electronic control unit (10), the ECU calculates the corresponding optimal accelerator position according to the obtained information, and sends a control signal to the accelerator actuator (4), and the accelerator actuator drives the accelerator to the calculated optimal accelerator opening position. By communicating with other electronic control units, such as engine electronic control unit, automatic transmission electronic control unit, etc. ), the ECU constantly corrects the optimal position of the throttle according to the information of the throttle position sensor (3), the signal of the engine speed sensor (2) and the information of the vehicle speed sensor (7), so that the opening of the throttle reaches the ideal position required by the driver. The biggest advantage of electronic throttle control system is that it can achieve the optimal torque output in the whole range of the engine.