Hybrid working machine

摘要

The present invention is to drive a hydraulic pump (12) and a generator motor (13) by an engine (10), electrically charge a battery (20) by a generator operation of the generator motor (13), and assist the engine (10) through driving the generator motor (13) by electric power of the battery (20). On the premise of the configuration above, when a deviation between a target rotation speed of the engine and an actual rotation speed of the engine is equal to or more than a preset value, and when a residual amount of fuel is equal to or less than a preset value, it is considered to be engine failure or an operation state which is directly connected to the engine failure and an engine assisting action is automatically stopped.