The working principle of automobile throttle

Throttle has two kinds of traditional pull-wire type and electronic throttle;

The traditional engine throttle manipulation mechanism is through the pull cable (soft wire) or pull rod, one end is connected to the accelerator pedal, the other end is connected to the throttle linkage plate and work.

Electronic throttle: the driver manipulates the accelerator pedal, and the accelerator pedal position sensor generates a corresponding voltage signal that is fed into the throttle control unit, which first filters the incoming signal to eliminate the influence of ambient noise, and then analyzes the driver's intentions according to the current operating mode, pedal movement and rate of change.

The basic demand for engine torque is calculated, and the basic expected value of the corresponding throttle angle is obtained. The CAN bus then communicates with the vehicle control unit to obtain other operating condition information and various sensor signals such as engine speed.

Most cars are using electronic throttles, which are not connected to the gas pedal. When the driver presses the gas pedal, there is a sensor on the gas pedal that sends this signal to the ecu, which then directly controls the opening of the throttle.

The electronic throttle allows for more precise control of the engine's air intake.

The throttle is known as the throat of the engine, and this component controls the amount of air that enters the engine.

We step on the gas pedal, in fact, is not directly control the amount of fuel injection, but to control the throttle opening, step on the gas pedal, the throttle opening will become larger, this time the amount of air into the engine will increase, so the ecu will control the injection system to spray more fuel, then the engine speed will rise, so the car will accelerate.

There is an air flow sensor in the air intake system of a car engine, and when the throttle opening becomes larger, the air flow sensor will send a signal back to the ecu, which will control the fuel injection system to spray more fuel.

If the air flow sensor is broken, then the engine speed will not increase when you step on the gas.

The engine works properly without sensors, there are many sensors around the engine, such as oxygen sensor, air flow sensor, intake air temperature sensor, water temperature sensor, shock sensor, camshaft position sensor and so on.

If a sensor is bad, it will affect the normal operation of the engine.