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With the development of vehicle technology , people on vehicle handling convenience and comfort of the increasingly high demand , so the automatic transmission loading rate is also rising. Due to cost constraints , there are still a considerable number of cars with manual gearbox, manual transmission it will increase the driver's labor intensity, the other is not conducive to driving safety. Loaded automatic transmission vehicles only easy to operate , smooth shifting , safety and comfort , but also the best time according to the automatic shift , helps improve vehicle dynamics and economy, so the various car manufacturers have developed their own automatic transmission as direction of development. Through the analysis of the current automatic transmission , proposed a new electronically controlled automatic transmission electric actuators , and its structure, working principle and characteristics were analyzed. Automatic transmission as a modern automobile is an important part of its performance greatly affect the quality of the car . Thus, in reference to the country , both inside and outside the relevant test standard transmission on the basis of a new automatic transmission for the development of relevant pilot projects. In the automatic transmission of new product development , testing and maintenance process, the transmission is extremely necessary to carry out relevant tests , in order to better against the proposed new automatic transmission studies , automatic transmission test rig was constructed , the main part is divided into hardware structure and software control section. The hardware part of the overall program , including test bench design, power plant analysis, analysis and test bench loading device performance matching ; software control section section includes test stand control system design, test system design, test sensor selection and parameter measurements. Finally apply MATLAB-SIMULINK toolbox built automatic transmission test bench simulation model, including the power supply module, the three-phase motor module, the transmission gear judgment model , transmission gear power transmission model and transmission load models. Set up and run a simulation model simulation parameters , through the simulation curve analysis to verify the correctness of the model .
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