| 摘要 |
A hydraulic controller of construction machinery. A plurality of actuators (4, 7) are actuated by operating operational levers (29a, 30a) while using a main merging/diverting valve (13), provided in an oil path (12) coupling the delivery oil paths (10, 11) of first and second hydraulic pumps, as a flow merging position. Operating condition of the operational lever is judged at an operating condition judging section (41). From among a variety of operation patterns set under that operating condition and stored in a controller (14), an operation pattern matching an actual operation pattern is selected at a pattern collating section. Since delivery pressure of each delivery oil path (10, 11) is high when the load pressure of each actuator (4, 7) is high, the main merging/diverting valve (13) is switched to a flow diverting position when the total delivery pressure exceeds a preset level, and switched to a flow merging position when the total delivery pressure drops below the preset level. Preparation of a troublesome control program is not required in the control. Switching between flow merging and flow diverting can be carried out smoothly with no shock even during work, and an optimal flow distribution is ensured constantly both at the time of flow merging and flow diverting.
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