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『The function of flowmeter』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. 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
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2. What is the function of a car air flow meter
The function of a car air flow meter is to detect the size of the engine intake and transmit the data to the on-board computer (ECU) to assist the ECU in accurately controlling the fuel injection amount, ensuring efficient and stable operation of the engine. The specific function and impact are as follows: Core function: detect the intake air volume and transmit data. The air flow meter measures the amount of air entering the engine (such as mass or volume), converts the data into electrical signals, and transmits them to the ECU. ECU calculates the optimal fuel injection amount based on parameters such as intake volume, engine speed, temperature, etc., to achieve precise mixing of fuel and air. For example, when the intake volume increases, the ECU will synchronously increase the fuel injection volume; When the intake air volume decreases, the fuel injection volume decreases accordingly, thereby maintaining the ideal air-fuel ratio of approximately 14.7:1. Direct impact on engine performance: Idle control: If dust accumulates on the hot film resistor of the air flow meter, it will crack and form a thermal insulation layer, causing the temperature change to slow down when the intake volume increases. The ECU misjudges it as a decrease in intake volume and reduces fuel injection volume. At this time, the actual intake volume is large and the mixture is too lean, causing the engin