Patent ID: 7338408
Filing Date: 2008-03-04
Classification: F16H,Y10S,Y10T

Abstract:
1. A method of controlling a hydraulic circuit for a twin-clutch transmission for motor vehicles, wherein the hydraulic circuit comprises first and second clutches that can be hydraulically actuated, the pressures of said clutches being controlled with respective pressure control valves, and wherein a safety circuit creates a safe state for the hydraulic circuit if a malfunction occurs, the method comprising: when a partial malfunction affecting only one of the two clutches occurs, disengaging the affected clutch; and when a total malfunction affecting both clutches occurs, disengaging the clutch with the lower clutch pressure at the time of the total malfunction, and maintaining the clutch with the higher clutch pressure at the time of the total malfunction engaged, wherein the transfer of torque via said clutch is maintained.