Patent ID: 11946224
Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC E  F | IPC E  F

Claim 4:
5. The construction machine according to claim 2, further comprising:
a third hydraulic pump;
a third pressure sensor that senses a pressure of the second accumulator; and
a fourth control valve capable of switching, in response to a control signal from the controller, a delivery port of the third hydraulic pump between a charge position in which the delivery port of the third hydraulic pump is connected to the second accumulator and an unload position in which the delivery port of the third hydraulic pump is connected to the tank, wherein
the controller is configured to control the fourth control valve such that, in a case where the pressure of the second accumulator is lower than the second set pressure, the fourth control valve is switched to the charge position, and in a case where the pressure of the second accumulator is equal to or higher than the second set pressure, the fourth control valve is switched to the unload position.