DISCHARGE QUANTITY CONTROLLER FOR VARIABLE-DISPLACEMENT OIL PRESSURE PUMP

摘要

PURPOSE:To avoid decrease of controllability of the other actuator when discharge pressure reaches relief pressure in one actuator, by improving a discharge quantity controller for a pump in a power unit provided with a plurality of actuators to which pressure oil is supplied from a variable-displacement oil pressure pump. CONSTITUTION:A discharge quantity controller 18 achieves the high-pressure cut-off control if discharge pressure of a pump 2 reaches a relief pressure when a single actuator is operated, while it does not achieve the high-pressure cut-off control if the discharge pressure reaches the relief pressure when a plurality of actuators are operated.