Patent ID: 7771317
Filing Date: 2010-08-10
Classification: F16D,F16H,Y10S,Y10T

Abstract:
1. A control valve arrangement for activating and controlling at least one start-up clutch of a vehicle automatic transmission during one of a hydraulic emergency operation caused by an electronic control device failure or an absence of a pilot pressure (P_VST 3 ), the valve arrangement comprising: at least one pressure regulating valve ( at least one clutch regulating valve ( a self-maintaining hydraulic unit comprising a self-maintaining valve ( the self-maintaining valve ( the control valve arrangement controlling one of activation and de-activation of the hydraulic emergency operation with a clutch activation pressure (P_K, P_K′); the clutch activation pressure (P_K, P_K′) being passable through a first line ( the clutch activation pressure (P_K, P_K′) being passable from the pressure chamber (