What are the types of air flow meters? | What are the commonly used models of low-pressure and high flow air flow meters

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1. What is the function of a car air flow meter?

The function of a car air flow meter is as follows: The car air flow meter can detect the intake volume of the engine, and then transmit the detected data to the on-board computer (ECU), which determines the fuel injection quantity through the data. If the intake volume increases, the fuel injection controlled by the on-board computer will also increase; If the intake volume decreases, the fuel injection controlled by the onboard computer will be reduced. There are four types of air flow meters: blade type air flow meter. Blade type air flow meter has a simple structure and high reliability; However, it has a large volume, high intake resistance, and slow response. The so-called muffled Karman vortex in Karman vortex street air flow meters refers to the phenomenon where two rows of vortices with opposite rotation directions are generated downstream of a cylindrical or triangular object when it is placed in a fluid. These vortices alternate between each other. During the process of generating Karman vortex street in optical Karman vortex street air flow meters, the air pressure on both sides of the vortex street generator changes and acts on the metal foil through guide holes, causing it to vibrate. When the light emitted by the LED shines on the vibrating metal foil, the reflected light received by the phototransistor on the metal foil is the vortex modulated light, and its output is demodulated to obtain a frequency signal representing the air flow rate. The ultrasonic transmission probe and reception probe of the Karman vortex street air flow meter are installed on both sides of the downstream pipeline of the Karman vortex generator. Due to the influence of Ka

2. What are the advantages and disadvantages of car air flow meters?

1、 Blade type air flow meter: Advantages: Simple principle. Disadvantage: It obstructs the intake air. The signal changes slowly.

2、 Measuring core type: Advantages: None. Disadvantages: There is intake resistance and inaccurate signals. The above two have been eliminated.

3、 Carmen eddy current type: Advantages: It can directly generate digital signals that can be received by a computer. The signal is accurate. Disadvantages: Complicated or pure structure, high manufacturing cost.

4、 Hotline type: Advantages: Low cost and accurate signal. Fast response speed. Disadvantage: It can only generate analog signals, and the computer needs to convert the received signals.

3. What are the types of air flow meters

1. Vane type air flow meter: Vane type air flow meter has a simple structure and high reliability; But it has a large volume, high intake resistance, and slow response.

2、 Karman vortex air flow meter: The so-called Karman vortex refers to two columns of vortices that alternate in rotation direction downstream of a cylindrical or triangular object placed in a fluid.

3、 Optical Karman vortex air flow meter: During the generation of Karman vortex, the air pressure on both sides of the vortex generator will change, and it will act on the metal foil through the guide hole, causing it to vibrate. W

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