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

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1. What are the types of mass flow meters? 2. What are the advantages and disadvantages of automotive 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 commonly used air flow meters?

1、 The blade type air flow meter has a simple structure and high reliability; However, the intake resistance is high, the response is slow, and the volume is large. The Karman vortex air flow meter uses airflow to bypass a conical object, generating two columns of vortices downstream. The vortex frequency is a function of the intake flow rate, and an instrument that determines the air flow rate by detecting the vortex frequency through optical or ultrasonic methods.

3、 During the process of generating Karman vortices in an optical Karman vortex air flowmeter, 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. When the light from the light-emitting diode shines on the vibrating metal foil, the reflected light on the metal foil receiv

4、 The hot film air flow meter adopts an isothermal hot wire method. The hot film type does not use white gold wire as the hot wire, but instead uses thick film technology to make the hot wire resistor, compensating resistor, and bridge resistor on the same ceramic substrate of Changqiandou. Attention should be paid to the correct installation of the air flow meter when using it. It should meet the requirements of the straight pipeline of the flow meter as much as possible and be installed horizontally. The inner diameter of the flow meter should correspond to the inner diameter of the pipeline. The wear-resistant flange bolts should be tightened completely to prevent dripping. The instrument wiring should be correct. If it is exposed to the sun, rain and sun protection measures should be taken to protect the compressed air flow meter. Not every air flow meter is installed in places with high vibration. However, the air flow meters installed in the compression plant and blower room must consider vibration issues. This type of vibration mainly comes from compressors and blowers, and the vibration of the machine can be transmitted to faraway places through air pipes or ducts.

4. 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 cylindri

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