Abstract
As an effective way for controlling emission of nitrogen oxide, EGR (Exhaust Gas Recirculation) has been widely used in automobiles. EVP (EGR valve position sensor) is a key component in EGR and functions as obtaining the accurate EGR valve opening position for governing the recirculation volume of exhaust gas. Its overall quality and working accuracy affect the performance of EGR directly and must be detected stringently before delivered from the factory. To solve the problems of labor intensity, low detecting efficiency, big deviation results with traditional EVP manual detection equipment in an automotive electronics company, an automatic detection system for EVP is developed based on PLC and industrial microcomputer. The working principle and structure of the system and design of EVP detection fixture are present, and hardware and software of its control system are developed in the paper. Three function modules, that are manual operation, automatic operation and data statistical analysis, are described in more detail. The practical application shows that the automatic detection system for EVP can achieve detection process flexibility, increase detection efficiency and accuracy greatly and solve the problems with traditional method effectively.
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