An operating method for a hybrid vehicle which has an electric motor for driving the vehicle and an internal combustion engine for power generation. Upon completion of the activation of a catalyst, the engine is operated in warm-up mode with a small throttle valve opening, and when the output of a water...http://www.google.fr/patents/US5492190?utm_source=gb-gplus-shareBrevet US5492190 - Operating method for a hybrid vehicle
