Control system in hydraulic construction machine

Details Control system in hydraulic construction machine Control system in hydraulic construction machine

1998-01-26

1999-04-27

Will, Thomas B.

Earth working

Automatic power control

60452, F16D 3102, E02F 920

Patent

active

058969306

ABSTRACT:
A hydraulic pump is driven by a first prime mover. An actuator, which is controlled by a control valve, is operated by a pressure oil fed from the hydraulic pump. A second prime mover, which is an electric motor, is provided separately from the first prime mover. A pilot pump is driven by the motor. Hydraulic oil is conducted from the pilot pump to a pilot port of the control valve through a pilot oil pipe. A remote control valve is provided in the pilot oil pipe, and change-over operation of the control valve is controlled by the remote control valve. In an on-load state, a command value for controlling the motor is set at a target current value corresponding to a normal pressure, while in an off-load state the command value is set at a target current value which is lower. By so doing, there does not occur any unnecessary power loss even in an off-load state.

REFERENCES:
patent: 4967557 (1990-11-01), Izumi et al.
patent: 5170625 (1992-12-01), Watanabe et al.

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