Abstract
Taking a dual-motor planetary two-gear transmission drive system as the research object, this paper analyzes the factors influencing gear shift process and major performance indexes. The study focuses on the influence of torque unloading and loading process on vehicle impact during gear shift stage. In view of the collaborative operation of main motor, auxiliary motor and gear shift actuator of transmission, the author proposed a control method and strategy process featuring multiple collaborative gear-shift torque. Then, a simulation platform was built for the vehicle and power system to simulate and compare torque unloading and torque recovery under specified acceleration condition. Compared with non-collaborative torque control, the vehicle impact under multiple collaborative control was reduced by 60% in torque unloading stage and 80% in torque recovery stage. Further, the prototype was developed for transmission control unit and power system and tested on the vehicle. The test results further demonstrated that multiple collaborative gear-shift torque control could effectively reduce the vehicle impact during unloading and loading, with gear shift time shortened and gear shift comfort improved.
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