Hydraulic control apparatus of working machine

Details Hydraulic control apparatus of working machine Hydraulic control apparatus of working machine

2007-03-01

2009-11-03

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

Reexamination Certificate

active

07610755

ABSTRACT:
With respect to a method of controlling a pump flow rate of a hydraulic pump, a method having a small flow rate command value is selected between a pressure feedback control for controlling the pump flow rate based on a set pressure (a cutoff pressure) and a pump pressure, and, an ordinary control for controlling the pump flow rate based on operation information, and in a case that the pressure feedback control is selected, a flow rate increasing control for increasing the flow rate command value after the case with the passage of time is performed.

REFERENCES:
patent: 2005/0204735 (2005-09-01), Sugano
patent: 3-55323 (1991-03-01), None
patent: 10-246204 (1998-09-01), None
patent: 2002-38536 (2002-02-01), None
patent: 2004-225867 (2004-08-01), None
patent: 2005-265002 (2005-09-01), None

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