Patent ID: 8821341
Filing Date: 2014-09-02
Classification: B60K,B60W,Y02T,Y10T

Abstract:
1. Method for controlling a powertrain system comprising an internal combustion engine, at least one electric machine and an electro-mechanical transmission operative to transmit torque to a driveline, the method comprising: enabling neutral operation of the transmission in response to an operator input; activating a first clutch coupled to a first planetary gear set, the first planetary gear set comprising a first element, a second element and a third element; coordinating torque commands between the engine and a first electric machine to establish a net zero output torque condition; and if a violation of the net zero output torque condition is present, allowing slippage of the first clutch to dissipate net output torque from reacting with the driveline of the powertrain system.