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The Intelligent Test System of Air Flow Sensor

Author: YangLin
Tutor: HuangTao; HuangJinHuo
School: Wuhan University of Technology
Course: Electronics and Communication Engineering
Keywords: Air flow sensor Test system Speed control system Calibration
CLC: U463.6
Type: Master's thesis
Year: 2012
Downloads: 87
Quote: 0
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Abstract


The air flow sensor, also known as the air flow meter, is one of the important components for electronic control unit on the automotive engine to regulate the air-fuel ratio (A/F) in order to achieve the best performance. It can transform the quality of air flow that flowing through the engine inlet air into electrical signals which would be sent to the electronic control unit (ECU), the electronic control unit accordingly combined with the information from other sensors to calculate the fuel injection quantity, controlling the air-fuel ratio in order to achieve the best performance. The quality and accuracy of air flow sensor have a great impact on automobile engine achieving the best working condition, therefore it is necessary to assess the performance of air flow sensor for enterprises.Due to the backwardness of the domestic technology level and arbitrary of manual measurement, the product quality is very unstable. So it’s imperative to design a system that can automatically detect the quality standards of sensor. Some related products had been designed in the foreign countries, however the price is undoubtedly expensive.Few domestic-funded enterprises can pay the price. Research in this area is still in its infancy, the design of the automatical and intelligent test system of air flow sensor is the subject content of this paper.The system is comprised of wind tunnel,speed control module,signal acquisition module and host computer software control module. The design of wind tunnel also called air supply system is used to simulate the work environment of air flow sensor in the engine inlet, which relating to the areas such as fluid dynamics and aerodynamics; Speed control system uses frequency control program, by the microcontroller as the lower machine controller. Microcontroller controls the inverter’s output frequency in order to regulate the fan speed, the air flow is determined by fan speed; Signal acquisition module is designed mainly for the sensor output voltage signal, parameters of the environment(such as temperature, humidity, pressure, etc.) if needed,which will be sent to the host computer to be processed; The host computer software control module is the core of the entire system control with a good user interface, making the judgment for the quality of the product.The research has a certain business requirements background.It provides a production line testing platform for the enterprise to ensure the product quality of the flow meter,with improving the production rate of quality products.Summary of the research content and further outlook are given at the end of paper.In order to further improve the stability and accuracy of the test system,some proposed solutions to the imperfections existing in the designed system are also put forward in the paper.

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