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1. Working principle of hot wire air flow meter
The working principle of hot wire air flow meter is that it works by placing a heating object in the fluid. The specific principle is as follows: Fluid takes away heat: When the fluid flows through this heating object, it will take away some of its heat. The relationship between temperature and mass flow rate: Under a certain heating energy, the temperature of the heating object is related to the mass flow rate of the fluid it flows through. The larger the mass flow rate, the more heat is carried away and the lower the temperature of the heating object. The relationship between resistivity and temperature: The resistivity of a heating object is related to its temperature. As the temperature changes, the resistivity also changes. Measuring flow rate: By detecting the temperature or resistance value of the heating object, the mass flow rate of the fluid can be indirectly measured. In summary, the hot wire friendly air flow meter utilizes the principle of heat dissipation of heated objects in fluids to measure the mass flow rate of fluids by detecting changes in temperature or resistance values.
2. Working principle of hot wire air flow sensor?
The circuit principle of a hot wire air flow meter is that when there is no air flow, the bridge is in a balanced state, and the control circuit outputs a heating current that flows to the hot wire resistor RH. When there is air flow, the heat of RH is absorbed by the air and becomes cold, causing the resistance value to change and the bridge to lose balance. If the temperature difference between the hot wire resistor and the intake air is kept constant and constant, the current IH flowing through the hot wire
3. Explain the working principle of the hot wire air flow meter
1. Introduction to the function of the air flow meter: The air flow meter measures the amount of fresh air entering the engine intake manifold.
And the intake temperature, ECU performs fuel injection quantity correction, smoke restriction, and EGR opening control based on this information
2. Installation position: The sensor is installed on the intake pipe of the bending pin motor, at the rear end of the air filter. 3. Working principle: 3.1. The principle of the air flow meter: The air flow sensor integrates some electronic components on a ceramic substrate. When the engine is working normally, it first heats the diaphragm, and when fresh air flows through the sensor, it takes away some heat. At this time, the ECU will control the Wheatstone bridge on the diaphragm to supplement heat, which will cause changes in the electrical signal. When the signal is transmitted to the ECU, The ECU will calculate the intake air volume based on this change. 3.2. The principle of the air temperature sensor is that the intake air temperature sensor is a resistor with a negative temperature coefficient. When the intake air temperature changes, the resistance of the resistor will change, causing a change in the signal voltage at the ECU end. Based on this change, the ECU calculates the intake air temperature. 3.3. Determination of airflow direction There are two temperature resistors at each end of the hot film of the air flow meter. When the airflow passes through the hot film, it will take away some heat, so the temperature at the front end of the hot film is relatively lower than that at the back end. T
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