HYBRID TYPE WORKING MACHINE AND METHOD FOR CONTROLLING SAME

A hybrid work machine includes an engine (11), a motor generator (12) connected to the engine (11), an electric energy storage unit (120) configured to store electric power generated by the motor generator (12), and a control part (30) configured to control driving of the motor generator (12). The control part (30) is configured to control the driving of the motor generator (12) so that an assist output of the motor generator (12) increases, based on an external condition of the engine (11).