| 摘要 |
<p>In a hydraulic shovel which operates in a high-speed operation mode and a low-speed operation mode, an object of the present invention is to satisfy both low fuel consumption operation speed. To achieve the object, there is provided a control unit for a construction machine comprising a first hydraulic pump 12 and a second hydraulic pump 13 driven by an engine 19, in which control valves 1 to 8 for various actuators are connected to oil paths of the hydraulic pumps 12 and 13, the control valves 1 to 8 are operated by a remote-control valve 11, an operation mode of the construction machine can be switched to either one of a low-speed operation mode and a high-speed operation mode, wherein when the construction machine is operated in the low-speed operation mode and when a pressure sensor 16 detects an operating speed of an operating lever of the remote-control valve 11 and the detection value exceeded a predetermined value, the operation mode is automatically switched from the low-speed operation mode to the high-speed operation mode by a command signal from a controller 21.</p> |
