(JP9103001-A)      The system (10) comprises an electric motor (14) which is operated by electrical energy generated by a generator and stored in a storage device (36). The engine (12) has a controller (28) operating in the electricity generating drive mode when a predetermined condition is satisfied. The controller operates to provide an output greater than the power required to drive the vehicle so the generator is driven by the surplus power.    The controller includes a device (S4) operated in the event of a failure of the generator for inhibiting the generating drive mode and selecting the engine drive mode to operate the engine for driving the vehicle with the required power, even when the predetermined condition is satisfied.    ADVANTAGE -   Vehicle does not suffer undesirable change in running performance in event of failure of electric motor.    (US6003626-A)      The system (10) comprises an electric motor (14) which is operated by electrical energy generated by a generator and stored in a storage device (36). The engine (12) has a controller (28) operating in the electricity generating drive mode when a predetermined condition is satisfied. The controller operates to provide an output greater than the power required to drive the vehicle so the generator is driven by the surplus power.    The controller includes a device (S4) operated in the event of a failure of the generator for inhibiting the generating drive mode and selecting the engine drive mode to operate the engine for driving the vehicle with the required power, even when the predetermined condition is satisfied.    ADVANTAGE -   Vehicle does not suffer undesirable change in running performance in the event of a failure of the electric motor.    (JP3003555-B2)      The system (10) comprises an electric motor (14) which is operated by electrical energy generated by a generator and stored in a storage device (36). The engine (12) has a controller (28) operating in the electricity generating drive mode when a predetermined condition is satisfied. The controller operates to provide an output greater than the power required to drive the vehicle so the generator is driven by the surplus power.    The controller includes a device (S4) operated in the event of a failure of the generator for inhibiting the generating drive mode and selecting the engine drive mode to operate the engine for driving the vehicle with the required power, even when the predetermined condition is satisfied.    ADVANTAGE -   Vehicle does not suffer undesirable change in running performance in the event of a failure of the electric motor.    (EP768203-B1)      The system (10) comprises an electric motor (14) which is operated by electrical energy generated by a generator and stored in a storage device (36). The engine (12) has a controller (28) operating in the electricity generating drive mode when a predetermined condition is satisfied. The controller operates to provide an output greater than the power required to drive the vehicle so the generator is driven by the surplus power.    The controller includes a device (S4) operated in the event of a failure of the generator for inhibiting the generating drive mode and selecting the engine drive mode to operate the engine for driving the vehicle with the required power, even when the predetermined condition is satisfied.    ADVANTAGE -   Vehicle does not suffer undesirable change in running performance in the event of a failure of the electric motor.