Patent ID: 6994360
Filing Date: 2006-02-07
Classification: B60K,B60L,B60W,Y02T,Y10S,Y10T

Abstract:
1. A method for controlling a hybrid electric vehicle powertrain having an internal combustion engine, a battery, an electric generator, an electric motor and a geared transmission, the geared transmission establishing a torque flow path from the engine to a torque output shaft, the method comprising the steps of: determining desired input torque, vehicle speed and the state-of-charge of the battery; determining whether the state-of-charge is less than a predetermined high value above which charging of the battery is not allowable; determining whether the state-of-charge is greater than a predetermined target value; operating the powertrain in a positive split mode when the state-of-charge is less than the high value and greater than the target value; and operating the powertrain in a generator drive mode with the engine off when the state-of-charge is greater than the high value.