| 摘要 |
A method is described for operating a hydraulic control system for a transmission having first and second torque transmission paths arranged in parallel with one another between a common input shaft and a common output shaft, first and second hydraulically controlled clutches (12, 14) arranged in the first and second torque transmission paths, respectively, and a hydraulically controlled gear synchroniser (22) in the second torque transmission path for selectively coupling a shaft (20) for rotation with a gear wheel (18) to effect a change in the transmission ratio through the second torque path while the second clutch (14) is disengaged. To prevent wear on the synchroniser (22) and the gear (18), prior to activating the hydraulic control for moving the synchroniser (22) into engagement with the gear wheel (18), the hydraulic control system is operative first to move the synchroniser (22) into a neutral position in which torque cannot be transmitted through the first torque transmission path. The second clutch (14) is then engaged for a predetermined time interval while the synchroniser (22) is in the neutral position to match the speed of the synchroniser (22) to that of the gear wheel (18) with which it is to be brought into engagement. <IMAGE> |
