Control of engine torque during upshift and downshift torque phase for a hybrid powertrain system

摘要

A powertrain includes an electro-mechanical transmission (10) mechanically-operatively coupled to an internal combustion engine (14) and an electric machine (56,72) adapted to selectively transmit mechanical power to an output member (64) through selective application of a plurality of clutches (70,62,73,75). A method for controlling the powertrain includes commanding a shift from a fixed gear operating range state to a second operating range state, commanding decreased reactive torque through an off-going clutch (70,62,73,75) during a torque phase of said commanded shift, and decreasing said reactive torque through said off-going clutch (70,62,73,75) through control of engine input torque.