Control system for hydraulic pumps of a civil machine

Details Control system for hydraulic pumps of a civil machine Control system for hydraulic pumps of a civil machine

1983-02-18

1985-03-26

Look, Edward K.

Pumps

Condition responsive control of drive transmission or pump...

Plural pumps with individual or relative control

60443, 60452, 60486, 417218, F04B 4900

Patent

active

045070571

ABSTRACT:
A civil machine having a flow-rate controller which applies a preset signal instead of a normal flow-rate signal to a variable type hydraulic pump when delivery pressure of the hydraulic pump exceeds a preset pressure value. The normal flow-rate signal corresponds to the position of an operating lever. The preset signal has a value of minimum flow rate to hold a working tool in a certain posture. With this control system, pressure loss and temperature rise in hydraulic operating oil as well as fuel consumption of the machine can be reduced and cycle time of the work can be improved.

REFERENCES:
patent: 3732036 (1973-05-01), Busbey et al.
patent: 3788775 (1974-01-01), Leutner et al.
patent: 4013380 (1977-03-01), Pensa
patent: 4073141 (1978-02-01), Lohbauer
patent: 4077744 (1978-03-01), Pensa
patent: 4103489 (1978-08-01), Fletcher et al.
patent: 4395199 (1983-07-01), Izumi et al.

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