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『Wing type air flow meter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Types and working principles of air flow sensors. Currently, common air flow sensors can be divided into blade type air flow meters, Karman vortex type air flow meters, hot wire type air flow meters, and hot film type air flow meters according to their structural types. According to the detection method, it can be divided into two categories: flow rate type and velocity density type. Flow rate type uses air flow sensors to directly measure the amount of air inhaled into the engine. Flow rate type air flow sensors mainly include wing type, Kalman vortex type, hot wire type, and hot film type. Among them, wing type and Kalman vortex type flow sensors measure the volume of inhaled air, so the air mass needs to be calculated by the electronic control unit based on information such as intake temperature; Hot wire and hot film methods directly measure the quality of inhaled air, so their accuracy is higher. Principle: Convert the amount of air drawn into the engine into an electrical signal and send it to the ECU as one of the main criteria for determining the basic fuel injection quantity. It is a sensor that measures the air flow rate inhaled into the engine. Electronic controlled gasoline injection engines must accurately measure the amount of air inhaled into the engine at each moment in order to obtain the optimal concentration of the mixture under various operating conditions, which serves as the main basis for ECU calculation (control) of fuel injection quantity. If the air flow sensor or circuit malfunctions and the ECU cannot receive the correct intake signal, it will not be able to control the fuel injection amount normally, which will cause the mixture to be too rich or too lean, resulting in abnormal engine 
2. How to judge the quality of a car air flow meter
1. Detection of wing type air flow meters There are two types of wing type air flow meters: 5-wire and 7-wire. The 5-wire wing type air flow meter does not have an oil pump switch inside, while the 7-wire wing type air flow meter has an oil pump switch inside.
. Names and functions of each terminal.2、 The detection of hot film air flow meter: Hot film air flow meter has low manufacturing cost, long service life, and is widely used. Santana Era Superman, SGM Buick and other cars all use this type of air flow meter. Symptoms of a broken car air flow meter include shaking at idle, high fuel consumption, weak performance at high speeds, and black smoke from the exhaust pipe. Inspection and analysis: After testing with a fault diagnosis instrument, it was found that the data block of the engine air flow meter exceeded the standard severely. The reason for the damage of the air flow meter was often due to the use of inferior air filters or the failure to regularly and carefully grind and replace the air filters, which caused dust to stay on the hot wire of the air flow meter bucket for too long, resulting in inaccurate or ineffective changes in its resistance value. In addition, dust can cause the throttle body to be too dirty.
3. How to check the quality of an air flow meter?
The method of detecting air flow meter The quality of air flow meter is crucial for the control system of electronic fuel injection engine, and its main responsibility is to measure the amount of air entering the engine.. If the vehicle experiences unstable idling, weak refueling, black smoke emission, or diff