Patent ID: 8250864
Filing Date: 2012-08-28
Classification: B60K,B60L,B60W,B60Y,Y02T

Abstract:
1. A method for controlling torque of a hybrid drive unit including a combustion engine and at least one electric machine operable alternatively as a motor or a generator, comprising: powering the electric machine by an energy storage device to operate the electric machine as a motor and supplying a positive electric motor torque together with a combustion engine torque of the combustion engine to produce a total drive torque of the hybrid drive unit; determining an electric motor maximum torque as a function of at least one state parameter of the energy storage device; and if a desired torque is greater than a consumption-optimized combustion engine maximum torque, operating the electric machine as a motor having an electric motor torque that does not exceed the determined electric motor maximum torque; wherein the combustion engine is operated having a combustion engine torque greater than the consumption-optimized combustion engine maximum torque if the desired torque is greater than a sum of the consumption-optimized combustion engine maximum torque and the electric motor maximum torque.