| 摘要 |
A pump control device for a construction machine, having a torque correction amount output section (T2) for outputting correction torque amounts for first and second pumps based on a discharge pressure (Pd3) of a third pump detected by pressure detection means (30), and the pump control device also having a standard torque output section (T1) for outputting standard torque values for the first and second pumps based on an engine target speed commanded by command means. The pump control device calculates, based on the output values (Td3, Te), a torque control command pressure for increasing input torque applied to the first and second pumps, supplies, as an external command pressure, the calculated torque to variable mechanisms of regulators for the first and second pumps, and controls so that the input torque to the first and second pumps is unnecessarily reduced. When three variable displacement hydraulic pumps are used, even if discharge pressure of one of the pumps is reduced and input torque to the other two pumps is reduced by using the reduced pressure, the output of the engine can be effectively used to prevent a reduction in the amount of work.
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