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An engine has an output shaft which is connected with a generator and a motor. A control device is provided to operate the generator in a high output torque period and to operate the motor in a low output torque period in an operating cycle of the engine. Thus, the generator applies a negative torqu

An engine has an output shaft which is connected with a generator and a motor. A control device is provided to operate the generator in a high output torque period and to operate the motor in a low output torque period in an operating cycle of the engine. Thus, the generator applies a negative torque to the output shaft whereas the motor applies a positive torque to the output shaft to thereby moderate the output torque fluctuations.

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In an internal combustion engine having an output shaft in which cyclical output torque fluctuations including a high output torque period and a low output torque period are produced as a result of operation of the engine, means for suppressing the output torque fluctuations including electric power

In an internal combustion engine having an output shaft in which cyclical output torque fluctuations including a high output torque period and a low output torque period are produced as a result of operation of the engine, means for suppressing the output torque fluctuations including electric power generating means adapted to be driven by the engine to supply the output shaft with a negative torque directed opposite to a direction of rotation of the output shaft, electric motor means for applying to the output shaft a positive torque which is in the direction of rotation of the output shaft, engine operating condition detecting means for producing an engine condition signal representing an engine operating condition, control means to operate the generating means in the high output torque period and to operate the motor means in the low output torque period, engine output shaft phase detecting means for producing an output shaft phase signal representing the rotational phase of the engine output shaft, engine speed detecting means for producing an engine speed signal, said control means including means for controlling operating timings of the power generating means and the motor means in accordance with said phase signal and said engine speed signal, and timing control means for receiving a signal from said control means and producing first and second motor starting timings and first and second generator starting timings, the operating timings of each of the generating means and the motor means being switched as an engine speed above changes to an engine speed below an engine speed at which torque fluctuations by combustion in the engine is substantially equal to those by inertia of the engine moving parts and vice versa.