| 摘要 |
PURPOSE:To improve the matching property at the time of composite operation and improve operability by calculating the load sensing target pressure difference based on the rotating speed of a prime mover and its change and driving a flow control means based on it. CONSTITUTION:A prime mover 1, a variable-displacement hydraulic pump 2, an actuator 3, a direction control valve 4 and a flow control valve 6 are provided. A memory device 22 storing the relation of the load sensing target pressure difference changed in response to the rotating speed of the prime mover 1 and its change and an arithmetic device 23 calculating it are provided on this device. The load sensing target pressure difference is calculated in response to the rotating speed of the prime mover 1 and its change, and the flow control valve 6 is controlled based on it. The gain of the flow of the variable- displacement hydraulic pump 2 is reduced as the rotating speed of the prime mover 1 is reduced. |
