Hydraulic circuit and method for controlling said circuit

Details Hydraulic circuit and method for controlling said circuit Hydraulic circuit and method for controlling said circuit

2006-10-13

2008-03-04

Lewis, Tisha (Department: 3681)

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

C477S086000, C477S906000

Reexamination Certificate

active

07338408

ABSTRACT:
A method for controlling a hydraulic circuit for a twin-clutch transmission, wherein the hydraulic circuit comprises a first and a second clutch that can be hydraulically actuated, the pressures of said clutches being controlled with respective pressure control valves, and wherein a safety circuit substantially guarantees a safe state for the hydraulic circuit if a malfunction occurs. The safety circuit is configured such that if a partial malfunction affecting only one of the two clutches occurs, the affected clutch is disengaged and if a total malfunction affecting both clutches occurs, the clutch with the lower clutch pressure at the time of the total malfunction is disengaged and the other clutch with the higher clutch pressure at the time of the total malfunction remains engaged to maintain the transfer of torque via said clutch.

REFERENCES:
patent: 6055879 (2000-05-01), Abe et al.
patent: 7153234 (2006-12-01), Berger et al.
patent: 101 48 087 (2002-05-01), None
patent: 101 20 882 (2002-10-01), None
patent: 101 34 115 (2003-01-01), None
patent: 101 38 395 (2003-02-01), None
patent: 102 38 104 (2004-03-01), None
patent: 0 802 355 (1997-10-01), None
patent: WO 03/074909 (2003-09-01), None

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