Patent ID: 7090613
Filing Date: 2006-08-15
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. A method of operating a vehicle powertrain system comprising an electric motor and transmission, the electric motor operably and selectively coupled to the transmission and adapted to provide an output torque contribution thereto, the electric motor having a predetermined maximum motor output torque and a predetermined minimum motor output torque which are used to determine a range of permissible control points for at least one transmission control parameter, comprising: establishing a motor torque reserve by performing at least one of decreasing the predetermined maximum motor output torque to a maximum reserved motor output torque and increasing the predetermined minimum motor output torque to a minimum reserved motor output torque, wherein the maximum reserved motor output torque and the minimum reserved motor output torque are used in place of the predetermined maximum motor output torque and the predetermined minimum motor output torque, respectively, to determine the range of permissible control points for the at least one transmission control parameter.