Patent ID: 8620544
Filing Date: 2013-12-31
Classification: F16H,Y10T

Abstract:
1. A transmission for a vehicle having a torque converter, the transmission comprising: a plurality of clutches that are selectively engageable, alone or in combination with each other, to establish a plurality of forward drive modes, wherein one of the plurality of clutches is also designated as a neutral idle (NI) clutch that is selectively actuated to shift the transmission into an NI state while in one of the forward drive modes; and a controller adapted to determine when torque multiplication via the torque converter will occur, and to shift the transmission from one of the forward drive modes directly into the NI state during a coast-down maneuver prior to the transmission reaching a zero output speed and before the torque multiplication occurs, wherein the controller selectively reduces hydraulic pressure to the designated NI clutch as part of the shift.