Thermal mode flowmeter | Basic principle of mass flowmeter

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Which expert can simply tell me about the operation of the thermal mode air flow meter in a car Xuner Instrument provides you with an answer: detecting flow requires two functional modules: heating and detection. The heating module is used to form a hot zone, and the detection module is used to convert the measured resistance change before collision detection into a signal recognizable by the ECU. The hot zone and detection resistor need to be directly connected to the airflow for heat exchange, while other circuit parts do not need to be connected. Therefore, the hot film air flow meter requires two structural modules: the control circuit board and the sensing probe. The heating resistor and detection resistor are arranged above the sensing probe and placed in the intake channel, while the remaining circuit parts are arranged on the control circuit board. Please accept if satisfied!

2. Basic principles of mass flowmeter

The core principle of mass flowmeter is to calculate the mass flow rate by directly measuring the changes in the physical properties of the fluid. The mainstream Coriolis and thermal flowmeters are designed based on mechanical and thermal principles, respectively.

. 1. Basic principle of Coriolis mass flowmeter: Utilizing the Coriolis force effect generated during fluid flow. When fluid flows through a vibrating measuring tube, a force perpendicular to the flow direction is generated due to inertia, causing the measuring tube to twist and deform. Working process: The driver causes the measuring tube to vibrate at a fixed frequency. -When fluid flows through a vibrating tube, there is a phase difference between the inlet and outlet. -The sensor detects the phase difference and direct Hot mode flowmeter

ly converts it into a mass flow rate value through a mathematical model. The measurement is not affected by temperature and pressure. 2. Principle basis of thermal mass flowmeter: Based on the law that the degree of heat carried away by fluid flow is proportional to the mass flow rate, it is divided into two control modes: constant temperature difference and constant power. Working process: In constant temperature difference mode, the power of the heating element increases with the flow rate, and the change in electrical power that maintains a constant temperature difference is the flow parameter. -In constant power mode, the larger the flow rate, the greater the temperature drop of the heating element, and the temperature difference directly corresponds to the flow rate value. -The structure usually includes an upstream temperature sensor and a downstream heating/temperature measuring element group, which is suitable for measuring the macroscopic curvature of gas microflows.

3. How to identify the direction of airflow when dealing with air flow? The sixth generation thermal mode air flow meter used in contemporary cars relies on its two temperature sensors to identify the direction of airflow. When identifying the direction of inhaled air flow, the air first passes through a temperature sensor. This design enables the hot mode air flow meter to accurately sense the state of air entering the engine. The air flowing back from the closed valve also needs to pass through a temperature sensor, which further helps the engine control unit calculate the oxygen content in the intake air, thereby achieving accurate air flow management. The two temperature sensors of the hot mode air flow meter respectively sense the air t

Thermal mode flowmeter | Basic principle of mass flowmeter

2. Basic principles of mass flowmeter

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