Hydraulic system and work machine comprising such a system

Details Hydraulic system and work machine comprising such a system Hydraulic system and work machine comprising such a system

2005-06-22

2008-12-16

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

C060S422000, C060S428000

Reexamination Certificate

active

07464545

ABSTRACT:
A hydraulic system includes a first pump that delivers hydraulic fluid to a first load outlet point and to a second load outlet point, a second pump that delivers hydraulic fluid to the second load outlet point, but not to the first load outlet point, a pressure detector for detecting the load pressure at the first load outlet point and a pressure detector for detecting the load pressure at the second load outlet point. The system includes a controller for controlling the first pump on the basis of the detected load pressure at the first load outlet point and the detected load pressure at the second load outlet point, and a controller for controlling the second pump on the basis of the detected load pressure at the second load outlet point but not on the basis of the detected load pressure at the first load outlet point.

REFERENCES:
patent: 3987623 (1976-10-01), Bianchetta
patent: 4030623 (1977-06-01), Bridwell et al.
patent: 4055046 (1977-10-01), Schexnayder
patent: 4073141 (1978-02-01), Lohbauer
patent: 4759183 (1988-07-01), Kreth et al.
International Search Report from corresponding International Application PCT/SE2005/000998.

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