Introduction to the working principle of the flow sensor on the car

Abstract: The information on the working principle of the flow sensor on the car is provided by the excellent flowmeter and flowmeter manufacturers. Abstract: The flow sensor is one of the key components of the electronic fuel injection system, which directly affects the normal driving of the vehicle. The air flow sensor used in the car is a type flow meter. Its function is to measure the air flow through the sensor within a certain period of time, and adjust the about empty. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is an introduction to the working principle of the flow sensor on the car. The flow sensor is one of the key components of the EFI system, which directly affects the normal driving of the vehicle. The air flow sensor used in the car is a type flow meter. The flow signal is sent to the ECU. The article describes the working principle of the flow sensor on the car. The flow sensor is one of the key components of the EFI system, which directly affects the normal driving of the vehicle. The air flow sensor used in the car is a type flow meter. The flow signal is sent to the ECU. According to the signal, the ECU monitors the working condition of the engine and calculates the fuel supply. A large air flow indicates that the engine is accelerating; a small air flow indicates that the engine is decelerating or idling. Working principle: When the air entering the throttle body flows through the sensor, it takes away part of the heat. The greater the air flow, the more heat it takes away. To keep the temperature of the sensor element at a constant temperature, additional current is required to heat the element. The sensor determines the amount of air flow by measuring the voltage of this current. The air flow sensor is made of platinum wire and extends into the bypass passage of the throttle valve body. This kind of air flow sensor adopts the principle of Wheatstone bridge. The resistance value changes due to the cooling effect of the air flow when energized in the air flow, and the bridge is therefore unbalanced, and the control circuit automatically increases the voltage and increases the flow rate. current, so that the resistance value increases with temperature, and the bridge regains balance. During the adjustment process, the voltage signal sent by the air flow sensor to the engine electronic control module (ECU) changes with the air flow. There is also a compensation resistance wire in the near air flow to avoid the bridge due to changes in air temperature. lost balance. After the fouling of the air flow sensor, the voltage signal sent to the ECU will be inaccurate. At this time, the dirt will affect the radiation and reduce the cooling effect. When the air flow increases, the temperature decreases slowly, and the change of its resistance value also decreases accordingly, so the voltage and the flowing current cannot be increased accordingly, so that the signal voltage sent to the ECU is low, causing the mixture to be too lean. Although the type air flow sensor is equipped with a burn-up circuit, that is, when each shutdown, the ECU will automatically heat the high temperature of 1000 ° C for 1s to burn off the dirt and dust, but some areas, especially in remote areas of my country, due to the If the quality of fuel is too low, the intake pipe will be tempered, causing excessive impurities and carbon deposits to be cemented on the metal platinum wire, so it is difficult to remove the single-heating purification device. Therefore, the air flow sensor must be removed for direct spray cleaning to restore its normal function. As a final note, an air flow sensor measures the air flow into the engine in g/s. Air flow measurements reflect engine load throttle opening and air volume, similar to engine load, intake manifold absolute pressure sensor or vacuum sensor signals. The air flow signal should remain relatively stable when the car is at a constant speed, change gradually with throttle opening, and change drastically during sudden acceleration. The powertrain control module PCM uses the air flow information to control the fuel supply. The sensor generates a frequency signal 32~150Hz which is not easily measurable during the test. The signal of this change will be proportional to the air flow. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Introduction to the working principle of the flow sensor on the car'

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