| 摘要 |
A shovel according to an embodiment of the present invention includes an engine (11) including a supercharger (11a) and being controlled at a constant revolution speed, a main pump (14) coupled to the engine (11), a hydraulic actuator driven by a hydraulic oil discharged from the main pump (14), a control valve system (17) including multiple flow control valves for controlling the flow of the hydraulic oil discharged from the main pump (14), and a controller (30) that controls an absorbing horsepower of the main pump (14). The controller (30) increases a boost pressure of the supercharger (11a) before a load is applied to the hydraulic actuator by controlling a specific flow control valve in the control valve system 17 to limit or block the flow of the hydraulic oil discharged from the hydraulic pump (14) and thereby increasing a discharge pressure of the hydraulic pump (14). |
