Patent ID: 8483919

Claim:
A method for controlling a double transition upshift in an automatic transmission of a vehicle powertrain, comprising: performing closed loop control of an intermediate shaft speed using a primary on-coming clutch in a primary gear section of the automatic transmission to achieve pull-down of the intermediate shaft, the primary gear section connected to an output shaft and the intermediate shaft, the intermediate shaft connected between the primary gear section and a secondary gear section of the automatic transmission; while the intermediate shaft is being pulled down, performing closed loop control of an input shaft speed using a secondary off-going clutch in the secondary gear section to achieve partial pull-down of the input shaft, the input shaft connected between the secondary gear section and a power generation unit of the vehicle; and releasing the secondary off-going clutch and performing closed loop control of the input shaft speed using a secondary on-coming clutch in the secondary gear section to complete the pull-down of the input shaft.