Velocity-pressure control apparatus of hydraulic machine

Details Velocity-pressure control apparatus of hydraulic machine Velocity-pressure control apparatus of hydraulic machine

2008-12-15

2011-11-08

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

C417S044200

Reexamination Certificate

active

08051653

ABSTRACT:
A velocity-pressure control apparatus of a hydraulic machine includes a pressure command generator, a pressure sensor, a pressure controller, a velocity command generator, a velocity limiter, a switch, a comparator, a velocity sensor, and a motor driver. The pressure controller receives a pressure compensation signal composed by the pressure command generator and the pressure sensor. The velocity limiter receives a compensation velocity signal from the pressure controller and a predetermined velocity signal from the velocity command generator and outputs a corresponding limiting velocity command signal to the switch. The comparator controls the velocity-pressure control apparatus to work at a velocity control mode when the pressure compensation signal is a positive signal or a null signal, and controls the velocity-pressure control apparatus to work at a master pressure control and slave velocity control mode when the pressure compensation signal is a negative signal.

REFERENCES:
patent: 5971714 (1999-10-01), Schaffer et al.
patent: 6074170 (2000-06-01), Bert et al.
patent: 6748739 (2004-06-01), Hirano et al.
patent: 6994537 (2006-02-01), Liu et al.
patent: 2009/0097986 (2009-04-01), Nakata et al.

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