Chery qq37 1 Function of Engine Intake Pressure Sensor

The function of the intake pressure sensor is to detect the absolute pressure of the intake manifold after the throttle, detect the change of the absolute pressure in the manifold according to the engine speed and load, and then convert it into a signal voltage and send it to the ECU,

, control the size of the basic fuel injection.

The intake pressure sensor is called MAP for short. It is connected to the intake manifold through a vacuum tube. With the different engine speed load, it will sense the vacuum change in the intake manifold, and then change from the internal resistance of the sensor to a voltage signal for ECU to correct the fuel injection quantity and ignition timing angle.

In EFI engine, the intake pressure sensor is used to detect the intake air volume, which is called D-type injection system. The intake pressure sensor does not directly detect the intake air volume like the intake air flow sensor, but indirectly detects the intake air volume, and it is also affected by many factors. Therefore, there are many differences between the detection and maintenance of the intake air flow sensor, and the faults generated are also special.