Title:
CONTROL CIRCUIT FOR A PNEUMATIC OR HYDRAULIC ACTUATOR
Document Type and Number:
WIPO Patent Application WO/2010/149446
Kind Code:
A3
Abstract:
The invention relates to a control circuit for a pneumatic or hydraulic actuator (1), particularly a pneumatic or hydraulic actuating cylinder of a vehicle transmission, comprising a plurality of valves (2, 3, 4, 5), wherein depending on a switching position of the valves (2, 3, 4, 5), a pneumatic or hydraulic control medium can be fed to or can be withdrawn from the pneumatic or hydraulic actuator (1). The invention further comprises an electronic unit (8), by which all valves (2, 3, 4, 5) can be controlled in order to determine the switching positions thereof and to hold the actuator (1) in a defined actuating position, or to bring it into a defined actuating position. According to the invention, the control circuit comprises an additional electronic unit (10), which controls at least one valve (2) such that the actuator (1) maintains or assumes a defined actuating position in the event that the electronic unit (8) fails.
Inventors:
VETTER MANFRED (DE)
SCHWARZ JOSEF (DE)
SCHWARZ JOSEF (DE)
Application Number:
PCT/EP2010/057166
Publication Date:
September 15, 2011
Filing Date:
May 25, 2010
Export Citation:
Assignee:
ZAHNRADFABRIK FRIEDRICHSHAFEN (DE)
VETTER MANFRED (DE)
SCHWARZ JOSEF (DE)
VETTER MANFRED (DE)
SCHWARZ JOSEF (DE)
International Classes:
F15B20/00; F16H61/12
Domestic Patent References:
| WO1996025612A1 | 1996-08-22 |
Foreign References:
| DE102006008575A1 | 2007-08-23 | |||
| DE19964419B4 | 2008-11-20 | |||
| US20090062976A1 | 2009-03-05 | |||
| GB2191875A | 1987-12-23 | |||
| DE102007018174A1 | 2008-10-30 |
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