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Automatic transmission as a key component of the modern car , its performance directly affects the car's power, economy and reliability. With the recent rapid development of the domestic auto industry , automatic transmission performance quality by the people 's attention , so that the transmission performance testing requirements are also rising . This paper studies the performance test for an automatic transmission automatic transmission load control system, a detailed analysis of the stability of the load control system and working principle , in-depth study of the loading motor running status , physical models and mathematical models , and on this basis improved on the control system hardware, system control strategy and software design, the final completion of the loading of the automatic transmission control system development . Firstly, from the theory, a detailed analysis of the working principle of the test system , the system steady-state operation of their relationships and load torque motor three operating states , and coordinate transformation based on the idea of ??establishing a loading motor mathematical model and derive synchronous motor is running the motor load torque equation for the test system control strategy to achieve a theoretical foundation . Secondly, the hardware on the analysis of the basic structure of the entire control system is given to industrial control computer as the core , torque, speed , current and other signal acquisition and processing circuit schematic design methods and discuss the implementation of the system institutions excitation control system design ; in the software, the PID control and fuzzy control combine the advantages of fuzzy PID controller was designed and completed by fuzzy PID controller as the core cascade dual closed-loop control systems research, and give a flowchart of the control algorithm , while a detailed analysis of vehicle road driving resistance , the system through the setting of the parameter will be able to simulate actual road conditions , road tests realization gearbox laboratory simulation . Finally, by using MATLAB / simulink software control system dynamic simulation , the results showed that the fuzzy PID controller control system has good dynamic response capability .
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