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Switch solenoid valve and proportional solenoid valve structural concepts were proposed for the hydraulic shift control system of some hydrodynamic mechanical automatic transmission, shift oil pressure of stationary combination valve and proportional solenoid valve was respectively modeled, simulated, contrasted and analyzed by dynamic simulation software in order to study shift quality of heavy-duty vehicle automatic transmission. The results show that proportional solenoid valve is better to control rise characteristic of shift oil pressure, reduce shift shock, improve shift quality and ride comfort than stationary combination valve. The correctness and validity of the model were verified through bench test, which reflected the shift oil pressure dynamic characteristics of hydrodynamic mechanical automatic transmission. The results can be used to match the performance and predict for heavy-duty vehicle shifting process, and lay the foundation to improve the shift performance of the system.

Shift Quality Analysis of Heavy-Duty Vehicle Automatic Transmission Shift Control Valve