Patent ID: 9394670
Filing Date: 2016-07-19
CPC Classification: E02F,F15B

Claim Text:
1. A construction machine comprising: an engine; a hydraulic pump which is driven by the engine; a plurality of hydraulic actuators which are driven by hydraulic fluid supplied from the hydraulic pump; a plurality of control valves which control flow rates of the hydraulic fluid supplied to the hydraulic actuators; a plurality of operating devices for operating the control valves; an energy recovery device including a regeneration hydraulic motor which is driven by return hydraulic fluid from a particular hydraulic actuator among the plurality of hydraulic actuators; a power adjustment device which adjusts a revolution speed of the engine to a value specified by an operator; an operation amount detection device which detects the operation amount of a particular operating device corresponding to the particular hydraulic actuator; and a control unit which controls the flow rate of the hydraulic fluid recovered by the regeneration hydraulic motor based on input signals from the power adjustment device and the operation amount detection device; wherein the control unit is configured to perform a control so as to decrease the flow rate of the hydraulic fluid recovered by the regeneration hydraulic motor with the decrease in the revolution speed of the engine.