The role of the intake pressure sensor, the position of the intake pressure sensor

The role of the intake pressure sensor: the intake pressure sensor provides engine load information and intake temperature information, and can convert the pressure of the engine intake pipe into a corresponding electrical signal. The engine electronic controller calculates the basic fuel injection time and fuel injection based on this signal. Amount and ignition advance angle, etc. The specific principle is as follows:

The intake pressure sensor is used to detect the absolute pressure of the intake manifold behind the throttle. It detects the vacuum change in the intake manifold according to the engine speed and load, and then converts it into a signal through the change of the internal resistance of the sensor The voltage is sent to the engine control unitYuan(ECU), ECU controls and corrects the fuel injection amount and ignition timing angle according to the magnitude of the signal voltage.

Intake pressure sensor location map

The intake air pressure sensor is located above the intake manifold of the engine. The intake pressure temperature sensor should be installed on the car's intake manifold, and its location is above the intake manifold to prevent water accumulation.

Pressure sensors come in many forms. According to the principle of signal generation, they can be divided into piezoelectric, semiconductor varistor, capacitive, differential transformer, and surface elastic wave types. Because the varistor type has the advantages of fast response time, high detection accuracy, small size and flexible installation, it is widely used in D-type injection systems.

When the engine is working, with the change of the throttle opening, the vacuum degree, absolute pressure and output signal characteristic curve in the intake manifold are all changing. The D-type injection system detects the absolute pressure in the intake manifold behind the throttle. The smaller the throttle opening, the greater the vacuum of the intake manifold, the smaller the absolute pressure in the manifold, and the smaller the output signal voltage. In engine work, the greater the throttle opening, the smaller the vacuum of the intake manifold, the greater the absolute pressure in the manifold, and the greater the output signal voltage.