关键词: 电动直连；换挡控制；换挡规律；换挡品质

Abstract: As the core technology of automatic transmission control system, shift control determines the vehicle's power, economy and comfort indicators. The mechanical synchronizer is abandoned in the electric direct coupled transmission, which makes the gear matching function between the engagement sleeve and the engagement gear lacking, so that shift impact, such as tooth top impact and synchronous impact, is more likely to occur at the moment of gear shifting. Therefore, in the control of electric direct transmission, the problem of precise speed regulation of drive motor and sectional control of joint sleeve is introduced. This paper systematically analyzes the key factors that affect the shift jerk and shift impact, and improves the shift performance index by optimizing the shift schedule curve and the shift process control algorithm. Finally, the algorithm is verified by bench and vehicle road tests. It lays a foundation for subsequent product market launch and technology upgrading.

Key words: Electric direct connection; Shift control; Shift schedule; Shift quality