The Research On The System Of Resistance Strain Micro-Displacement Sensor Based On The Automotive Piston For Detecting

Along with the rapid development of science and technology, increasing the demand for automobiles, automobile quality, performance and productivity requirements are constantly improving. And the quality of automobile engine piston directly relates to the thermal efficiency mechanical efficiency, energy consumption and operational reliability of automobiles. Therefore, the detection factory of piston products is particularly important.This research is the micro-displacement sensor in the device of vehicle piston for detecting. One of the most crucial measurement technique bases on strain gauge. Through accessing to a large number of information, conducting a comprehensive analysis of its performance, I have designed the strain gages decline displacement sensor which was adapted to the detection of automotive piston.Through a great deal of theoretical calculations and experimental studies,I have established the structure of the sensors, the form and the model of strain gages, ultimately, I found a structure which was more rational. By application INA128 I produced a signal amplification circuit and did the voltage adjustment, finally, I used MAX197 voltage converter chip to be A/D converter of the amplified signal, transmitting the converted data to the MCU for processing.The work environment of the sensor is relatively poor, so I did some experimental studies on the design of the sensor and its detection system about disruptive, stability, repeatability and so on. The experimental results show that: the sensor has advantages of strong anti-jamming, good stability, high accuracy, high resolution and low cost and so on, fully being able to meet the requirements of automotive piston.