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The hydraulic shift system of a deep hybrid transmission in a certain model was simulated and tested. First, the basic configuration of the gearbox was introduced. Then, the working principle of the hydraulic source, main oil circuit control system, shifting and parking control system, cooling lubrication system and shifting execution system were explained according to the schematic diagram of the hydraulic shifting system. The dynamic simulation model of hydraulic shift system was established via AMESim. Based on the comparison between the experimental data and the simulation results, the correctness of the model was verified. The dynamic characteristics of the main oil circuit and the shifting element were simulated. The results show that the hydraulic shift system meets the design requirements. The bench test results of powertrain verified the correctness and rationality of the hydraulic shifting system.

Dynamic Simulation and Experimental Study of Hydraulic Shift System for Deep Hybrid Transmission