Full clutch slip power shift of a dual clutch transmission

摘要

A system for operating a dual clutch transmission, including launch/creep controller, shift logic, and a clutch control assembly. The shift logic is configured to intercept a torque command including a target clutch torque from the launch/creep controller as it transmits the target clutch torque to the clutch assembly. The shift logic engages a preparation phase that increases torque on an on-coming clutch to a prefill torque. The shift logic then engages a torque phase that transfers torque between the off-going clutch and the on-coming clutch by simultaneously decreasing the off-going clutch torque and increasing the on-coming clutch torque. The off-going clutch and the on-coming clutch remain in a slipping state that maintains the target clutch torque during the transfer.

主权项

1. A method of controlling a dual clutch transmission, including an on-coming clutch and an off-going clutch, comprising:
generating a torque command from a launch/creep controller, the torque command including a target clutch torque; reading the torque command using a shift logic; implementing a preparation phase comprising:
increasing torque on the on-coming clutch to a prefill torque;implementing a torque phase transferring torque from the off-going clutch to the on-coming clutch, the torque phase comprising:
increasing torque on the on-coming clutch towards the target clutch torque, said on-coming clutch remaining unlocked during the transfer; anddecreasing torque on the off-going clutch, said off-going clutch remaining unlocked during the transfer; wherein as the off-going clutch torque is decreasing, the combination of the on-coming clutch torque added to the off-going clutch torque maintains the target clutch torque.