| 摘要 |
<p>When a control lever (8) is operated to leftward under a heavy load, a pressure sensor (11) detects a pressure to a direction switching valve (1), pressure sensors (9, 10) detect pressures on upstream and downstream and sides of a throttle valve (4), and an inclination angle sensor (15) and a revolution counter (16) detect an inclination angle of a swash plate and the number of revolutions of a pump (2), the detected pressures, angle and rotations being input to a controller (12). A target flow rate setting unit for lifting of a boom determines a target flow rate for lifting of a boom on the basis of signals from the pressure sensor (11) and the revolution counter (16), a detecting unit of a discharge flow rate of a pump determines a discharge flow rate of a pump on the basis of signals from the inclination angle sensor (15) and the revolution counter (16), and a differential pressure detecting unit and a center bypass flow rate computing unit determine a center bypass flow rate on the basis of signals from the pressure sensors (9, 10). A computing unit of a flow rate for a boom cylinder determines a flow rate for a boom cylinder on the basis of a discharge flow rate of a pump and a center bypass flow rate, and a first computing unit of a target displacement of a pump calculates a first target inclination angle theta 1 of a pump based on a differential flow rate between a target flow rate for lifting of a boom and a flow rate for a boom cylinder. At this time, the first target inclination angle theta 1 becomes larger than a second target inclination angle theta 2 of a pump for negative control to be selected by a maximum value selecting unit, and a smaller one of the first target inclination angle theta 1 and a maximum inclination angle theta max by horse power control is selected by a minimum value selecting unit, so that a corresponding target electric current is output to a solenoid proportional valve (13) from a drive signal generating unit to cause a piston (6a) of a regulator (6) to be driven to rightward in Fig. 4. Accordingly, a flow rate of a hydraulic pump (2) is gradually increased whereby a constantly favorable metering characteristics is obtained irrespective of magnitute of load. <IMAGE></p> |
