Patent ID: 8286741

Claim:
A hybrid operating machine comprising: an engine which generates torque by combustion of a fuel, a motor generator capable of selectively performing a power generation operation and an assisting operation, an external load serving as an engine load, a torque transmission machine which performs mutual transfer among the torque of the engine, a torque of the motor generator, and a torque to be applied to the external load, a speed sensor which measures the rotating speed of the engine, and a control device which controls the engine and the motor generator, wherein the control device is capable of storing a speed command value which indicates a target value of the speed control of the engine, calculating a torque generated by the motor generator on the basis of a motive power required for the external load to perform a torque control of the motor generator, performing a speed control of the motor generator on the basis of a difference between a rotating speed measured by the speed sensor, and the speed command value, and switching a control mode where the torque control of the motor generator is performed, and a control mode where the speed control of the motor generator is performed.