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Engine intake pressure sensor: principle and DigiPlusfunction With the continuous development of the automobile industry, more and more intelligent technologies have been applied to automobiles. One of the important roles is the engine intake pressure sensor. So, what is this kind of sensor and what is its function? This article will introduce the working principle and function of the engine intake pressure sensor in detail.I. What is the engine intake pressure sensor? The engine intake pressure sensor is a sensor that senses the air flow, air pressure and other parameters of the engine intake pipe. Usually, it is installed on the engine intake pipe or intake manifold to measure the pressure of the intake system, send real-time data to the engine control module, and manage the engine through ECU (ECU: engine control unit). II. Working principle of engine intake pressure sensor The core part of the engine intake pressure sensor is the sensitive MEMS (MEMS: microelectromechanical system) chip, which converts pressure signals into electrical signals. When air flows into the surface of the engine, it will flow through the holes in the sensor, resulting in pressure changes. The voltage-sensitive resistor encapsulated in the chip can produce corresponding resistance changes according to the pressure changes.The resistance change signal is further processed, converted into a digital signal and sent to the vehicle ECU. III. The function of the engine intake pressure sensor The engine intake pressure sensor plays a very important role in the operation of the engine. It can provide important pressure data for the ECU, enabling the ECU to control the fuel injection and ignition time of the engine in a targeted manner in order to maximize the performance and fuel efficiency of the engine. Specifically, its main functions are as follows: 1. Controlling the fuel injection and intake pressure will directly affect the fuel injection of the engine. When the engine is working at an altitude higher than sea level, the air diffuses due to low air pressure, resulting in thinning of gasoline in contact with oxygen, resulting in combustion difficulties. At this time, the engine intake pressure sensor can control the ECU to inject more fuel into the engine to maintain normal combustion.2. Control the ignition time. The data collected by the engine intake pressure sensor can also help the ECU ensure the accuracy of the ignition time. Because when the fuel is injected into the cylinder, it needs to be ignited to cause an explosion to make the piston move. Normal engine operation requires ignition according to the rhythm, and the ignition time of each cylinder will also be different. Through the engine intake pressure sensor, the ECU can automatically determine the ignition timing according to the engine speed and intake pressure to ensure the smooth operation of the engine. 3. The last point of controlling emissions is that when the engine is working, oxygen and fuel convert oxygen-containing substances into harmless oxides when burning. If the combustion is incomplete, the pollution of the emitted oxides to the environment will increase. Using the engine intake pressure sensor to reduce the fuel concentration and make the air-fuel ratio more biased to the redox reaction is one of the important ways to alleviate this pollution.IV. Summary Engine intake pressure sensor is one of the core sensors of the engine, which plays a crucial role in vehicle performance and safety. As the owner of the car, we should pay attention to maintaining the cleanliness and normal operation of the engine intake system, so as to ensure that the engine intake pressure sensor can work accurately and send signals, so that the engine performance is always in the best state.

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