Patent ID: 8070636

Claim:
An electrohydraulic control device ( 1 ) of an 8-speed transmission of a motor vehicle having at least one solenoid valve ( 5 ) and several electrically controllable pressure control valves ( 6 to 12 ) for hydraulically actuating five switching elements (A to E) and an electric gear control unit, via which different operating states of the 8-speed transmission are adjusted, at least three of the switching elements being connected in the force flow of the gear control unit for representing a gear ratio (â€œ1â€; â€œ2â€; â€œ3â€; â€œ4â€; â€œ5â€; â€œ6â€; â€œ7â€; â€œ8â€; â€œRâ€), when the gear control device is de-activated and consequently a power supply to the solenoid valve ( 5 ) and the pressure control valves ( 6 to 12 ) is interrupted and in the presence of an operating state of the 8-speed transmission in which the gear ratio (â€œ1â€; â€œ2â€; â€œ3â€; â€œ4â€; â€œ5â€; â€œ6â€; â€œ7â€; â€œ8â€; â€œRâ€) is engaged in the 8-speed transmission, a predefined emergency transmission (â€œ6â€; â€œRâ€) is represented by three simultaneously entirely hydraulically connected switching elements (C, D, E; A, B, D).