| As the ideal transmission device, automatic transmission is one of the key automotive parts assembly, and is the important direction of energy saving and new energy automobile transmission system. The hydraulic automatic transmission are gave more and more attention by the world’s leading OEMs with many strengths such as mature technology, good industrialization base,easy operation, simple control, good adaptability, high reliability, etc. but still has short comings such as low transmission efficiency, large fuel consumption. Electric hydraulic module is the core component of the automatic transmission parts, consisted of valve body, oil and all kinds of control valve, controlling the automatic transmission shift, cooling and lubrication, etc., its efficiency directly affects the performance of the automatic transmission. Therefore, the study of efficiency of electric hydraulic module has important significance for the working performance of the automatic transmission.This paper first introduces the development history of hydraulic automatic mechanical transmission and the basic structure, and do a overview on development and direction of the core components of electric- hydraulic module of automatic transmission from the theory of valve body flow fluid and electromagnetic technology. Secondly, analyzes the valve body efficiency from the causes of the pressure loss, and expounds the type and cause of pressure loss. Then, carried on the simple analysis the oil port and established the basic equations of fluid flow and k- epsilon turbulence model of the main body. In addition, it built computational structure simulation modeling for the process chamber and S structure based on CFD, analyz ed the cause of the pressure loss and a reasonable optimization was carried out. The result shows that the optimized flow pressure loss decreased significantly and be helpful to improve work efficiency of main valve board.Again, the paper analyzes the structure and principle of proportional electromagnetic valve which used in the electric- hydraulic module, and the dynamic and steady operating characteristics are analyzed, which validate the performance and actual working efficiency through the bench test and simulation.Finally, the paper set up the test bench of the AT electro-hydraulic module, and had the experimental analysis of hydraulic control circuit in the electro-hydraulic module such as the main regulating control system, hydraulic torque converter control system, and the shifting clutch control system, etc. The results show that the electric hydraulic module has accuracy control loop and less lag in the hydraulic test in the hydraulic control circuit. |
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