Patent ID: 9340953
Filing Date: 2016-05-17
CPC Classification: B60K,B60W,E02F,F02D,Y02T,Y10S

Claim Text:
1. A construction machine comprising: a body; a drive portion which is attached to the body; an engine which is mounted in the body; a generator motor which is attached to the engine and which can be driven as an electric generator or an electric motor; a hydraulic pump which is driven by the engine and the generator motor; a plurality of hydraulic actuators which drive the drive portion with motive power generated by the hydraulic pump; a pressure control device which operates in accordance with discharge pressure of the hydraulic pump; a pressure detection portion which detects the discharge pressure of the hydraulic pump; a plurality of operation devices which generate and output operation signals in order to operate the plurality of hydraulic actuators; a control portion which lowers a drive output of the generator motor in accordance with a drive state of the drive portion and limits a drive output of the hydraulic pump in order to keep a rotation frequency of the engine within a range of predetermined values; and wherein when an operation amount of the other of the operation devices is within a predetermined range which is set in advance, the control portion determines that the drive portion is in a non-excavation state, and lowers the drive output of the generator motor.