CONTROL DEVICE FOR A HYBRID VEHICLE, AND A CONTROL METHOD

摘要

A hybrid vehicle is equipped with an engine and an electric motor for generating vehicle drive force. An operation region indicated by the rotation speed (Ne) and torque (Te) of the engine contains a normal region (305) where a fuel injection amount is calculated in accordance with a stoichiometric air-fuel ratio, and an OT increase region (310) where a fuel injection amount is made greater than the fuel injection amount that is in accordance with the stoichiometric air-fuel ratio in order to suppress the temperature rise of a catalyst provided to an engine exhaust system. A control device for a hybrid vehicle calculates the overall power required by a hybrid vehicle in accordance with the state of the vehicle and determines an engine operating point in accordance with the overall required power. When an engine operating point (P1) is within the OT increase region (310), an engine operating point (P2) within the normal region (305) is changed by decreasing the engine output power. The electric motor output power is determined so that the lowering of engine output power due to a change in the engine operating point is compensated, and the overall required power is ensured.