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A method of determining an operating state of an internal combustion engine in a hybrid electric vehicle drive system comprising an internal combustion engine having an output shaft which is coupled to a generator. The engine includes a fuel injector responsive to a fuel command. The method comprise

A method of determining an operating state of an internal combustion engine in a hybrid electric vehicle drive system comprising an internal combustion engine having an output shaft which is coupled to a generator. The engine includes a fuel injector responsive to a fuel command. The method comprises the steps of determining an ON/OFF status of the fuel command and determining the generator torque. The generator torque provides an indication of the actual engine torque. An engine running flag is set ON when the fuel command is ON and the generator torque value is greater than a predetermined value. Otherwise, the engine running flag is set OFF.

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1. In a hybrid electric vehicle drive system comprising an internal combustion engine having an output shaft which is coupled to a generator, said engine including a fuel injector responsive to a fuel command, a method of determining an operating state of said engine comprising the steps of:determin

1. In a hybrid electric vehicle drive system comprising an internal combustion engine having an output shaft which is coupled to a generator, said engine including a fuel injector responsive to a fuel command, a method of determining an operating state of said engine comprising the steps of:determining an ON/OFF status of said fuel command; determining a torque value of said generator; and setting an engine running indicator when said fuel command is ON and said generator torque value is greater than a predetermined value.