| 摘要 |
<p>A controller (24) is provided with function generators (151 and 152). The generator (151) has such a characteristic that a first target tilt amount υN increases from a minimum value to a maximum value as the detected value PN of a pressure sensor (21) for negative control pressure decreases; the generator (152) has such a characteristic that a second target tilt amount υB increases from a prescribed minimum value to the same maximum value as the detected value PB of the manipulated variable (pilot pressure) for driving a boom cylinder increases. The controller (24) selects the smaller one out of the two target tilt amounts and drives a proportional solenoid valve (25) based on the smaller value. Therefore, undesired speed increase of such a specific hydraulic actuator as a swinging motor (9), etc., other than boom cylinders which occurs at the time of controlling the tilt amount in accordance with a negative control pressure can be suppressed.</p> |
