Step-out clutch-to-clutch upshift control

Details Step-out clutch-to-clutch upshift control Step-out clutch-to-clutch upshift control

F - Mech Eng,Light,Heat,Weapons

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F16H 59/14 (2006.01) F16H 61/06 (2006.01) F16H 59/18 (2006.01) F16H 59/38 (2006.01) F16H 59/46 (2006.01) F16H 61/08 (2006.01) F16H 61/684 (2006.01)

Patent

CA 1275828

STEP-OUT CLUTCH-TO-CLUTCH UPSHIFT CONTROL Abstract of the Disclosure A control method for the torque establishing devices of a motor vehicle multiple speed ratio automatic transmission which is connected to the engine through a fluid coupling, particularly in step-out situations where an upshift is commanded in response to a rapid decrease in the engine throttle position. When step-out situations likely to produce a sharp reversal in the polarity of torque carried by the transmission input shaft are identified, an activated torque establishing device is deactivated at a time determined in relation to the speed ratio across the fluid coupling, thereby avoiding transmission gear lash related output torque disturbances due to the torque reversal.

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