Hybrid vehicle drive system adapted to produce substantially constant vehicle drive force under the same vehicle running condition, even in different modes of operation

摘要

A hybrid drive system for a motor vehicle, including a drive power source consisting of an engine operated by combustion of a fuel, and an electric motor operated with an electric energy, and a controller for selectively establishing a plurality of operation modes in which the drive power source is placed in respective different operating states, and wherein the controller includes a drive force control device for controlling the hybrid drive system so as to produce a substantially constant drive force for driving the vehicle, under the same running condition of the vehicle, irrespective of the currently established operation mode.