Automatic Transmission Design With Load Spectrum Measurements Taken And Methodology

Load spectrum is basic data to improve precision, lightweight, the performance indexes of transmission, according to the measured data of load spectrum can reflect the actual working condition and always have high reliability. The drive train operation diversity, complex characteristics of impact load change, Limit load of the transmission data acquisition has the certain difficulty. The design of automatic transmission load with the load spectrum data by foreign manufacturers as trade secrets, At the same time, domestic related research technology focus military-industrial complex and can’t open, lead to achieve a domestic car industry localization and the long-term dependence on imported automatic transmission.In this paper, a model is equipped with international advanced automatic transmission vehicle as the research object, Combined with the characteristics of tight and narrow space in the transmission system of this type of vehicle, design the test system has the characteristics of high precision, small size and low power consumption, the reference international general load spectrum test method, application of digital simulation technology assist to real vehicle road test load spectrum acquire automatic transmission prototype, production to provide design basis for the same type product. This paper in view of the real vehicle tests involving the sensor precision, measuring point selection, testing system design and installation, roads, plan formulation, and many other problems are studied. Using simulation method to calculate the transmission load range for the sensor selection determines the scope of the range. Analyses of hydraulic retarder’s at empty loss state have an influence on the scale range. Discuss indirect test to obtain the transmission load spectrum method. Designed has high testing precision and installation advantages of small volume, convenient operation test system. Select location of the sensor measurement points and working a plan of typical road. Complete data preprocessing, correlation test, the rain flow count method, the design loaded load spectrum compiling and a series of research. Through the research automatic transmission load spectrum test and research work has a certain reference and specifications in the future, in order to promote the localization process of automatic transmission to provide power.