Research On The Key Technology Of The Rapid Performance Test For Vehicle Air Compressor

The vehicle air compressor is one of the key component for medium-sized trucks and vehicle car, because the power for braking system of them is supplyed from the vehicle air compressor, so the performance of vehicle air compressor performance is vital important for vehicle braking system. It is very seriously important for vehicle air compressor inspection and comprehensive performance test before to the market. Because the limit export of the key technologies to China, our country's compressor performance test method and device are now on the last century eighty time,especially lack of the technology and test device on the product design&experiment verification for vehicle air compressor. The rapid performance test for vehicle air compress is blank in current domestic. This situation has serious hampered the development of vehicle air compress industry.Combining with "the vehicle air compressor integrated performance testting bench" of European Knorr brake Dalian Branch and the project "the research of vehicle air compressor volume flow online rapid detection method based on dynamic filling modification method" that founded by the Education Department of Anhui Province, this dissertation aims at the defects of domestic vehicle air compressor performance test, research the key technologies to realize the vehicle air compressor rapid performance test, include the dynamic error correction method for the measure data, use the Case-Base Reasoning(CBR) method of reasoning the test result and the buffer pressure automatic regulating problem in different conditions, and successfully apply them to rapid performance test device of vehicle air compressor.The main works and innovations of the thesis are as follows:1. Based on the research of the performance test method in current vehicle air compressor industry, the feasibility of the vehicle air compressor rapid performance test and the key technologies are analysised.2. According to the defect of the filling tank method, a new rapid performance test method including the dynamic data error correction, buffer pressure automatic regulating and case-based reasoning is put forward.3. Combining with the characteristic of the measure signals for the rapid performance test, this dissertation analysised the deficiency of estimation methods for dynamic error correction that used in rapid performance test currently, study the Unscented Kalman Filter(UKF) predictor-correction method. The simulation and actual application results show that the UKF predictor-correction technique can correct dynamic error efficienttly in rapid vehicle air compressor performance test.4. Combining with the property of the vehicle air compressor performance test, this dissertation puts forward the case-based reasoning method to realize the rapid performance test. The Fuzzy similarity case retrievl method and the hamming distance are adopted in the method, which can better judge different attributes, and can more accurate retrieval the attribute for database.5. In the rapid vehicle air compressor performance test, the discharge pressure under different condition is required to be steady state. The Fuzzy adaptive PID control strategy is given in this thesis, the discharged pressure control system for vehicle air compressor rapid performance test is designed and simulated. The simulation and actual application results show that the control strategy can achieve steady discharge pressure under variation operation condition.6. The UKF predictor-correction method and CBR method are applied to the vehicle air compressor rapid performance test device that based on buffer pressure regulating, the test results show that the research of this dissertation can realize the rapid performance test for vehicle air compressor.