Patent ID: 8718886

Claim:
An automatic transmission for use in a vehicle powertrain, comprising: a countershaft gear section, the countershaft gear section connected to an output shaft; a planetary gear section; an intermediate shaft connected between the countershaft gear section and planetary gear section; an input shaft connected to the planetary gear section; and a processor-based controller unit in operative communication with the countershaft gear section and the planetary gear section; wherein the controller is configured to perform closed loop control of the intermediate shaft speed during the double transition upshift using a primary on-coming clutch in the countershaft gear section to achieve pull-down of the intermediate shaft; wherein the controller is further configured to perform closed loop control of the input shaft speed using a secondary off-going clutch in the planetary gear section to achieve partial pull-down of the input shaft while the intermediate shaft is being pulled down; and wherein the controller is further configured to release the secondary off-going clutch and perform closed loop control of the input shaft speed using a secondary on-coming clutch in the planetary gear section to complete the pull-down of the input shaft.