Patent ID: 9013050
Filing Date: 2015-04-21
Classification: B60K,B60W,E02F,H02P,Y02T

Abstract:
1. A hybrid construction machine, comprising: a hydraulic actuator; a hydraulic pump which discharges hydraulic fluid for driving the hydraulic actuator; a generator-motor which performs an electric generator action of generating electric power and performs an electric motor action of generating motive power; an engine connected to the hydraulic pump and the motor-generator; an electrical storage device; and a controller which causes the generator-motor to perform the electric generator action to charge the electrical storage device and causes the generator-motor to perform the electric motor action by electric power discharged from the electrical storage device to assist the engine, wherein the controller causes the generator-motor to start the electric generator action at the time when an output of the engine is equal to or greater than a predetermined engine lower limit output, and controls the electric generator action of the generator-motor so as to keep the engine output in a range of no lower than the engine lower limit output.