Patent ID: 9091329
Filing Date: 2015-07-28
Classification: F16H

Abstract:
1. A method of controlling a transmission, comprising: detecting an initiation of a garage shift of the transmission; in response to such detection, applying a first assist clutch to interconnect a first stationary member to a first planetary gear set of the transmission; applying a second assist clutch to interconnect a second stationary member to a second planetary gear set of the transmission, wherein the second planetary gear set is coupled to an output member of the transmission; applying a primary clutch to interconnect the first planetary gear set to a third stationary member; reducing a first pressure applied to the first assist clutch of the transmission by a first pressure calibration value; determining whether a gear lash has occurred; and after determining whether the gear lash has occurred, reducing a second pressure applied to the second assist clutch of the transmission to minimize driveline torque disturbances during the garage shift.