Patent ID: 8983745
Filing Date: 2015-03-17
Classification: F16D

Abstract:
1. A method of executing a double transition shift in a transmission having a plurality of selectively engageable clutches engageable in different combinations to establish multiple different gears with gear ratios of torque of an output member to torque of an input member, the method comprising: receiving a command for a double transmission shift from a current gear to a commanded gear; wherein the double transition shift requires at least four clutches including a first offgoing clutch and a second offgoing clutch that are engaged in the current gear and not engaged in the commanded gear, and a first oncoming clutch and a second oncoming clutch that are not engaged in the current gear and are engaged in the commanded gear; determining via a controller that one of the four clutches has a clutch slip direction relative to input member rotation direction in one of the current gear and the commanded gear and an opposite clutch torque direction relative to input member torque direction in the other of the current gear and the commanded gear; calculating clutch torques for the first offgoing clutch and the first oncoming clutch; controlling torque at the offgoing clutches and the oncoming clutches during the shift according to said calculated clutch torques to: