Automobile engine throttle position sensor

Function and structure of 1. throttle body
After the throttle body is installed in the air flow meter in front of the intake manifold, its function is that the driver controls the throttle opening by operating the accelerator pedal to change the cross-sectional area of the intake passage, thereby controlling the operating conditions of the engine. And detect the operating conditions of the engine through the throttle position sensor.
The throttle body can be divided into two parts according to the connection method of the accelerator pedal and the throttle: rigid connection and flexible connection.
The traditional throttle adopts a rigid connection, that is, a mechanical connection that connects the accelerator pedal and the throttle valve through a pull rod or cable transmission. Therefore, the throttle opening depends entirely on the position of the accelerator pedal, that is, the driver's operating intention. However, from the perspective of power and economy, the engine is not always in the best operating conditions, and the driver's misoperation will also bring hidden dangers to safety. The flexible connection cancels the traditional connected throttle cable, and the throttle opening is controlled by the ECU, so it is also called the electronic throttle control system.
2. throttle position sensor and its installation position
The throttle position sensor is installed on the throttle body and is linked with the throttle shaft.
3. the function of the throttle position sensor
The throttle position sensor is also called the throttle opening sensor. It can convert the throttle opening into an electrical signal and input it to the ECU. The ECU determines the engine's idle speed, medium speed, and full load conditions based on the throttle position signal; It can also determine the acceleration and deceleration conditions of the engine according to the rate of change of the signal voltage of the throttle position sensor, and is used to control fuel injection, ignition control and other auxiliary system control. Damage to the throttle position sensor will cause low and unstable idle speed. When the brake is applied when driving, the engine speed will drop until it stalls, and occasionally it will move.
4. type of throttle position sensor
Throttle position sensors can be divided into three types according to different structures: electric shock switch type, linear variable resistance type, electric shock and variable resistance combination type; according to the type of output signal, they are divided into switch output type and linear output type.
The basic structure and working principle of the 5. throttle position sensor
The basic structure and working principle of the linear variable resistance throttle position sensor; it has a three-wire connector, of which, line 1 provides a 5V reference voltage to the sensor; line 2 is connected to the sliding contact of the sensor, So as to provide the ECU with a voltage signal of the throttle opening; line 3 is connected to the other end of the sensor sliding resistance, and provides grounding for the sensor through the engine ECU. The voltage value at any point on the sliding resistor is proportional to the opening angle of the throttle. This voltage is the output signal of the throttle position, as well as the acceleration rate and deceleration rate signals. This not only improves the acceleration performance of the engine, but also realizes rapid deceleration. Cut off fuel to improve its economy and environmental protection performance.