| 摘要 |
A method of controlling the torque transferred across each of the two clutches (32,34) of a dual clutch transmission (10) during a gear shift, wherein the first of the two clutches (32) is the off-going clutch and the second of the two clutches (34) is the on-coming clutch. The method includes the steps of determining when a shift has been commanded, then sensing the speed of the driven member of the off-going clutch, determining the desired clutch torque and slip profile for the changeover of the clutches, and sensing the speed of the driven member of the on-coming clutch to determine a target engine speed profile. Then, the method simultaneously controls the torque transfer across each clutch so that the torque output of the transmission will be changed over from the off-going clutch to the on-coming clutch by linearly decreasing the torque transferred across the off-going clutch while linearly increasing the torque transferred across the on-coming clutch in an inversely proportional rate to follow the clutch torque and slip profile and to cause the engine to track the target engine speed profile. Finally, the pressure applied to the on-coming clutch is varied, once the on-coming clutch is transferring all of the output torque, to cause the engine to continue to track the target engine speed profile so that vehicle speed is maintained. |
