Patent ID: 7755309
Filing Date: 2010-07-13
Classification: B60K,B60L,B60W,Y02T

Abstract:
1. A drive system for a motor vehicle, comprising: a main drive device that is a combustion engine; an electric machine coupled to the main drive device; a transmission device for implementing a ratio change without a tractive power interruption; and a control device for controlling the electric machine and for controlling the transmission device, wherein: the control device, in the event of a braking demand, causes a demanded total braking torque to be at least proportionally provided by the electric machine, if a change of the transmission ratio is implemented in the presence of an existing braking demand for a constant total braking torque, the control device controls the electric machine to at least partially compensate for changing of the total braking torque due to an additional braking torque caused by the ratio change, to maintain the constant total braking torque according to the braking demand, and the additional braking torque comprises a drag torque of the combustion engine and a torque resulting from an angular momentum change of the combustion engine.