| 摘要 |
Provided is a construction machine capable of securing excellent operability and achieving great fuel reduction effect by efficiently using recovered energy. A construction machine, comprising a hydraulic pump of the variable displacement type which is driven by an engine, a swing hydraulic motor, a swing electric motor, a delivery capacity regulating device which regulates the delivery capacity of the hydraulic pump, and a control unit which controls the driving/braking of the swing structure by using the sum total of torque of the swing hydraulic motor and torque of the swing electric motor when a swing control lever is operated, is configured to comprise an operation amount detection device for detecting the operation amount of the swing control lever and a speed detection device for detecting the speed of the swing electric motor. The control unit includes a hydraulic pump output reduction control unit which takes in an operation amount signal representing the operation amount of the swing control lever detected by the operation amount detection device and a speed signal representing the speed of the swing electric motor detected by the speed detection device and controls the delivery capacity regulating device by calculating a reduction rate of the output of the hydraulic pump based on the detection signals. |
