Logic design method and optimization of hydraulic system for heavy-duty automatic transmission

In this paper, the shifting control hydraulic system of the heavy-duty automatic transmission was designed, aiming to unify and standardize design methods. The said system was designed according to the binary logic characteristics of hydraulic components. In addition, to meet the torque transmission requirements and reduce the energy consumption, both the oil pressure supply and flow-regulating system were designed. Mathematical and simulation models of the hydraulic system were established to analyze its performance. Finally, the genetic algorithm was used to optimize the system (within the AMESim environment); the results have shown that the main pressure of each gear was controlled in a reasonable range, and both the pressure of shift clutch and the pressure response time were reduced. In addition, the power loss of the hydraulic system was significantly improved, which improved the practical performance of the overall hydraulic system.