『Circuit diagram of air flow meter』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)
How does an air flow meter work?
In electronic fuel injection systems, the air flow sensor, which measures the amount of air drawn in by the engine, is one of the important components that determines the accuracy of system control. When the control accuracy of the air-fuel ratio (A/F) of the air and mixture sucked in by the engine is set to ± 1.0, the allowable error of the system is ± 6 [%]~7 [%]. When this allowable error is distributed to the various components of the system, the allowable error of the air flow sensor is ± 2 [%]~3 [%]. The ratio of the maximum to minimum air flow rate of a gasoline engine, max/min, is 40-50 in a natural intake system and 60-70 in a system with turbocharging. Within this range, the air flow sensor should be able to maintain a measurement accuracy of ± 2-3 [%]. The air flow sensor used in electronic fuel injection devices should not only maintain measurement accuracy over a wide measurement range, but also have excellent measurement responsiveness, be able to measure pulsating air flow, and the output signal processing 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 volume and D-type control that indirectly measures the intake air volume based on the intake manifold negative pressure spike and engine speed. In the D-type control method, the microcomputer ROM stores the intake air volume in various states with engine speed and intake pipe pressure as parameters in advance. Based on the measured intake pressure and speed in each operating state, the microcomputer can refer to the intake air volume stored in the ROM to calculate the fuel volume L The
2. What are the 5 lines of the air flow meter?
The five wires of the air flow meter: two are intake temperature wires: one is a live wire, one is a signal wire, and the other three are a live wire, one is a ground wire, and one is a signal wire.. An air flow meter is a device that converts the amount of air drawn in into an electrical signal. The advantages of an air flow meter are minimal pressure loss and a wide range of measurable flow rates. The ratio of the maximum flow rate to the minimum flow rate of an air flow meter is generally above 20:1, and it is suitable for a wide range of industrial pipe diameters, up to 3m. The output signal is linear with the measured flow rate, with high accuracy, and can measure the fluid flow rate of acid, alkali, salt solutions, water, sewage, corrosive liquids, as well as mud and slurry with conductivity ≥ 1 μ s/cm. But air flow meters cannot measure the flow of gas, steam, and purified water. Additional information: Classification of principles of air flow meters Blade type air flow meters The structure of air flow meters is simple and highly reliable; However, the intake resistance is high, the response is slow, and the volume is large. The so-called Karman vortex air flow meter refers to the vortex that occurs downstream of a cylindrical or triangular object when it is
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