关键词: 双离合变速器；传动系间隙；滑行降挡转动力降挡；换挡品质

Abstract: There is inevitably a gap in the vehicle power transmission system, especially in the urban driving process, the brake pedal and the accelerator pedal are frequently switched, stepping on the accelerator pedal during coasting downshifting will often induce serious shift shock problems. This article analyzes the reason of the impact from the hardware structure and control principle as the direction switching of the drive train. Through the control strategy and calibration optimization, the drive direction is actively switched during the gear shifting process, the feasibility of the strategy is verified by the actual vehicle test. And it has been promoted on related models.

Key words: Double clutch transmission; Driveline clearance; Coast downshift to force downshift; Shift quality