Patent ID: 7780572

Claim:
A control valve arrangement for controlling actuation of at least one starting clutch of an automatic transmission of a motor vehicle, the control valve arrangement comprising: a clutch regulation valve ( 3 ) for directing a supply pressure (P_V 1 ) to a pressure chamber of a clutch actuation device ( 4 ) of the at least one starting clutch; a pressure regulation valve ( 166 ) being controlled by an electronic control unit to produce and direct a controllable pilot pressure (P_VST 3 ) to at least one control valve; a self-holding hydraulic system which, upon initiation of an emergency operation function caused by a failure of the electronic control system and a consequential loss of the pilot pressure (P_VST 3 ), maintains the clutch actuation device ( 4 ) of the at least one starting clutch in a switching condition that existed before the failure of the electronic control system and the consequential loss of the pilot pressure (P_VST 3 ), in at least one operating situation, to operate the self-holding hydraulic system in the emergency operation function, the self-holding hydraulic system comprises a self-holding valve ( 1 ) and an actuation valve ( 2 ), the self-holding valve ( 1 ) directs an actuation pressure (P_A) to the actuation valve ( 2 ) depending on an engine-speed-dependent control pressure (P_D), the actuation valve ( 2 ) then directs the actuation pressure (P_A) to the at least one clutch regulation valve ( 3 ); a means for preventing, in at least one of the at least one operating situation, the emergency operation function despite loss of the pilot pressure (P_VST 3 ) and a presence of an engine-speed-dependent control pressure (P_D) which is sufficiently high enough to initiate the emergency operation function; and the at least one operating situation is a particular operating situation in which the motor vehicle has first been driven in one of a forward drive gear and a reverse drive gear via the at least one starting clutch which is at least partially engaged, the motor vehicle has then been stopped and then while one of the forward drive gear and the reverse drive gear was engaged in the automatic transmission, the at least one starting clutch has been disengaged by biasing a transmission selector lever into one of a neutral position and a parking position (P).