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Research of Automotive Air Quality Flow Sensor

Author: JinYueChuan
Tutor: HeTianMingï¼›WangZeSen
School: Wuhan University of Technology
Course: Vehicle Engineering
Keywords: Air flow sensor Hot-film MEMS Finite Element Analysis
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 202
Quote: 5
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Abstract


The engine intake air flow is a very important parameter measurement, because the adjustment of the air-fuel ratio of the gasoline mode is used to adjusted the intake air amount matches the fuel injection quantity, so now the electronic control gasoline injection system can accurately measure the engine's intake gas, so that the correct air-fuel ratio control within the required range, the engine power, economy and emissions performance. The mass air flow sensor current automotive engine electronic control one of the most critical components in the fuel injection system, the accurate measurement of the engine's air intake air devices. On air density and the pressure in a vehicle air flow sensor, since the thermal type flow sensor having no mechanical transmission, without compensation, the response speed is fast, the test of high sensitivity, high reliability work. Therefore, the development of hot-film air flow sensor is very rapid, and began to be widely used in the automotive sector. The design of the hot-film air flow sensor car reads as follows: by the hot-film air flow sensor for the analysis and comparison of the performance of the current used car, it is not difficult to see that the quality of the air flow sensor which performance is best a vehicle air flow sensor. Below detailed analysis based on the theoretical basis and heat transfer in the process of hot-film air flow sensor and sensor works as well as the basic structure for in-depth study. Through analysis and comparison of the flow sensor in the car to use the advantages and existing problems, and simple to make a forecast of its future development prospects. Fully understand and master the theoretical analysis of the hot-film air flow sensor based on the paper using a hot-film air flow sensor MEMS fabrication, design an integrated sensor head sensor, so the sensor structure simple, and the use of computer circuit diagram of the direct control of the heating resistor current design. Focuses on the process of the sensing unit chip material selection process. Hot-film air mass flow rate sensor of the static and dynamic calibration test method designed to improve the measurement accuracy of the sensor through the sensor static dynamic calibration, especially in static calibration of the sensor, the analog of the atmosphere of the engine in the inlet different humidity, so as to solve the intake humidity sensor measured. Finally, the finite element analysis software for sensor design of the thermal analysis of the temperature field by simulation to determine the size and position of the structure of the silicon cup and the shape and mutual position of the heating resistor and the detection resistor, the sensor chip is optimized structural design of . Hot-film air mass flow sensor, its purpose is to master the production process of the sensor and MEMS technology, the structure and the improvement of the control circuit of the sensor to improve the performance of the product, promotion of the product in the domestic.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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