Vortex air flow meter

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1. The air flow meter of a car is essential. Do you know what role it plays? The function of a car air flow meter is to detect and detect the intake volume of the engine. It can convert the information of engine intake into electrical signals and send them to the ECU. The blade type air flow meter has a simple structure and high reliability; However, due to its large size and high intake resistance, the response time should be slow. Carmen vortex street air flow meter. The so-called Karman vortex refers to two rows of vortices with opposite rotation directions and alternating with each other appearing downstream of a cylindrical or triangular object placed in a fluid. Optical Karman vortex street air flow meter. During the process of generating Karman vortices, the air pressure on both sides of the vortex generator will change and act on the metal foil through the guide hole, causing it to vibrate. When the light from the LED shines on the vibrating metal foil, the reflected light on the metal foil received by the phototransistor is modulated by eddy currents, and its output is demodulated to obtain a frequency signal representing the airflow. Ultrasonic Karman vortex street air flow meter. Install ultrasonic transmission probes and reception probes on both sides of the downstream pipeline of the Karman vortex generator. Due to the influence of Karman vortices on air density, the time from the transmitting probe to the receiving probe will be later than the time without vortices, resulting in a phase difference. By processing the phase signal, vortex pulse signals can be obtained. Although the malfunction of the air flow sensor will not cause the engine to fail to start, it will affect the power performance of the engine. The damage of air flow meters is often caused by long-term failure to replace the air filter or the use of low-quality air filters, resulting in the accumulation of dust on the hot wire of the air flow meter for a long time, leading to inaccurate or ineffective changes in its resistance value. Dust can also cause the throttle valve to become dirty. In order to obtain the optimal mixture concentration under various operating conditions, the air flow meter must correctly measure the amount of air inhaled into the engine at each moment, which can serve as the main basis for ECU calculation and control of engine fuel injection quantity. If the sensor or circuit malfunctions, the ECU will not be able to obtain the correct intake signal and will not be able to control fuel injection properly. The mixture will be too rich or too lean, and the engine will not operate normally.

2. 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 amount through the data.

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