Principle of multi-classification characteristic of automobile air flow meter

Abstract: The principle information of the multi-classification characteristics of the automobile air flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Wenzhou Guoda Electric has a strong investigation and found that the automotive air flow meter used in the electronically controlled fuel injection device should not only maintain the measurement accuracy in a wide measurement range, but also have excellent measurement responsiveness. It can measure pulsating air flow and output a signal. of. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the principle of multi-classification characteristics of automobile air flowmeters. Wenzhou Guoda Electric has a strong investigation and found that the automotive air flow meter used in the electronically controlled fuel injection device should not only maintain the measurement accuracy in a wide measurement range, but also have excellent measurement responsiveness. It can measure pulsating air flow and output a signal. handling should be simple. According to the different characteristics of the air flow sensor, the fuel control system is divided into L-type control that directly measures the intake air amount and D-type control that indirectly measures the intake air amount according to the measurement method of the intake air amount (according to the negative pressure of the intake manifold and the engine The rotational speed indirectly measures the intake air volume. In the microcomputer ROM in the D-type control method, the intake air volume in various states is pre-stored with the engine speed and the pressure in the intake pipe as parameters, and the microcomputer operates according to the measured The intake pressure and rotation speed under the state, referring to the intake air volume memorized in the ROM, can calculate the fuel volume. It is necessary to respond to the rapid change in flow rate that occurs when the throttle is applied, and to detect the uneven air flow caused by the shape of the intake manifold before and after the sensor with high accuracy.·The structure of the valve type air flow sensor The valve type air flow sensor is installed on the gasoline engine, between the air filter and the throttle valve, its function is to detect the intake air volume of the engine, and convert the detection result into an electrical signal, Then input into the computer. The sensor is composed of air flow meter and potentiometer. First look at the working process of the air flow sensor. The air sucked in by the air filter rushes towards the valve, and the valve turns to the position where the intake air volume and the return spring are balanced and stops, that is to say, the opening degree of the valve is proportional to the intake air volume. The rotating shaft of the valve is also equipped with a potentiometer, the sliding arm of the potentiometer rotates synchronously with the valve, and the voltage drop of the sliding resistor is used to convert the opening of the measuring piece into an electrical signal, which is then input to the control circuit.·In order to overcome the shortcomings of the valve type air flow sensor, that is, to expand the measurement range and cancel the sliding contact on the premise of ensuring the measurement accuracy, a small and lightweight air flow sensor has been developed. Scroll air flow sensor. Karman vortex is a physical phenomenon. The detection method and electronic control circuit of the vortex have nothing to do with the detection accuracy. The air passage area and the size change of the vortex generating column determine the detection accuracy. And because the output of this sensor is an electronic signal (frequency), the AD converter can be omitted when the signal is input to the control circuit of the system. Therefore, in essence, the Kalman vortex air flow sensor is a signal suitable for computer processing. This sensor has the following three advantages: high test accuracy, can output linear signals, and simple signal processing; long-term use, the performance will not change; because it detects volume flow, it does not need to correct the temperature and atmospheric pressure. Detection principle: When the overhead wires in the field are blown by the wind, they will whine. The higher the wind speed, the higher the sound frequency. This is due to the formation of vortices after the airflow flows through the wires. This phenomenon occurs in liquids, gases and other fluids. This phenomenon can be used to make a vortex flow sensor. Two rows of vortices are formed after the columns are placed in the pipe, and the flow rate can be measured according to the frequency of the vortices. Because the vortex is formed into two parallel columns and alternates from left to right, similar to the street lights on both sides of the street, it is called the vortex street.

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