Interrelated power delivery controls – including engine control – Clutch control – Condition responsive control
Reexamination Certificate
2003-11-26
2008-09-02
Lorence, Richard M. (Department: 3681)
Interrelated power delivery controls, including engine control
Clutch control
Condition responsive control
C192S111120, C192S070251, C192S090000, C192S085060
Reexamination Certificate
active
07419456
ABSTRACT:
A known device for increasing the functional reliability for a hydraulic circuit of a hydraulic clutch having a pressure reservoir (25) and a release cylinder (5) which comprises a primary piston (14) and a secondary piston (16). A compensation volume is developed in the sense that when the vehicle is at a standstill and the parking brake released, an unintentional release of the clutch is prevented. A pressure-monitoring/pressure-supply device (28) is used for determining a reference operating pressure and establishes a static pressure which, in case of any system error, only allows displacement of the secondary piston (16) such that the contact pressure of the clutch discs, against one another, is still sufficient to maintain the vehicle at a standstill.
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Ebner Otto
Gansohr Marcus
Knoblauch Thomas
Rüchardt Christoph
Schweiger Klaus
Davis & Bujold & Daniels, P.L.L.C.
Lorence Richard M.
Young Edwin A.
ZF Friedrichshafen AG
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