Research And Fault Diagnosis Of Transmission Test For Commercial Vehicle

With the continuous growth of China’s automobile production, the car has entered the each and every family in china. People in the choice of car, in addition to price, appearance and other factors, more emphasis on safety, comfort and other performance indicators. As one of the important components of automobile, the quality of transmission has been the focus of the manufacturers closely watched. After developing a new transmission, a large number of tests are needed to determine whether it meets the design requirements and meets people’s needs. Then, it is required to test the transmission technology. With the continuous development, there are more and more testing technologies of transmission, which mainly bench test and vehicle test. Vehicle test is to install the transmission on a test car, the test car carried on an automobile proving ground, and other special venues traveling. When tested, the test car select roads in different states, car transmission test data acquisition system for data acquisition, and then analysis and processing the test data, extracting all aspects of the performance index of the transmission. The advantage of this test is that the car run in the real working conditions and the test data is quite accurate but there is a long test period, high cost, easily affected by external factors and other shortcomings. Therefore, the domestic commonly use bench test. In this paper, we research the program simulated road test bench design on the basis of the national standards as well as the selected of test hardware and the design of test software On this basis, at the same time, the paper further use the influence coefficient method established a evaluation method of commercial vehicle transmission operating conditionsThe issue is mainly aimed at a new type of heavy commercial vehicle transmission, which is a new research of a company, were evaluated above bench test and operating conditions. After studying the test program and technology of this type of transmission, make use of the enterprise existing conditions,according to the power of transmission and other indicators,a flat‐enclosed AC transmission testing station has been developed based on the company is selected to carry out this task of the testing for detection. Collect and analyze the relevant data, and make use of the above data make a preliminary diagnosis, to achieve a goal of the studies about fatigue life of the transmission、evaluation of operating conditions and initial diagnosis.The design frame of this paper is as follows : first elaborated the significance of the test for detection technology of transmission and its current situation of the development; and after presenting overall program design,introduced the specific design process of test bench, which is constructed for this topic test, explained its main components and design basis; followed with the introduction of the test control system of the testing, according to several key parameters to be measured of performance tests to format the test details; and secondly describes the software development and design of the test system of test bench. Finally, carried out load tests to a specific transmission in order to verify that the previous contents of this paper are designed to meet the specific requirements of the experiment.Through detailed analysis of experimental data proved the rationality of the test bench and its related test program and technologies, to meet the needs of enterprises.