Control system

Details Control system Control system

2005-04-05

2005-04-05

Bucci, David A. (Department: 3682)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

With spring device

C474S069000

Reexamination Certificate

active

06875139

ABSTRACT:
A method and a control system for supplying a working medium to a hydraulically-operated device. The working medium pressure is adjusted as a function of a control variable provided by a pressure control valve or a pressure reduction valve, both within a nominal working pressure range and also within a maximum working pressure range that lies between the nominal range and a system pressure value. For the same change in the control variable, the working medium pressure is changed by a greater amount in the maximum pressure range than it is in the nominal pressure range. Thus, in the nominal pressure range a precise adjustment of the working pressure can be made, and in the maximum pressure range a larger working pressure adjustment can be made to respond to suddenly increased external forces that act on the hydraulic device.

REFERENCES:
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patent: 5199313 (1993-04-01), Muller
patent: 5342246 (1994-08-01), Mori
patent: 5836207 (1998-11-01), Spooner et al.
patent: 5957260 (1999-09-01), Kunii
patent: 5992590 (1999-11-01), Harries
patent: 6073644 (2000-06-01), Friedmann et al.
patent: 6477446 (2002-11-01), Holtmann et al.
patent: 487134 (1992-05-01), None
patent: 124806 (1983-07-01), None

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