Patent ID: 7464617

Claim:
A servo-assisted control system for a double clutch gearbox of motor vehicle having six or seven forward gears and a reverse gear, the system comprising: a first hydraulically-operated actuator device for controlling the engagement of a first set of gears by selection and engagement movements; a second hydraulically-operated actuator device for controlling the engagement of a second set of gears by selection and engagement movements; a first solenoid valve arranged to selectively and alternatively put the first and the second actuator device into communication with a supply of fluid under pressure; a second solenoid valve arranged to control the selection movements of said first actuator device when it is in communication with the fluid supply and to control the selection movements of said second actuator devices when it is in communication with the fluid supply; and a third proportional pressure solenoid valve and a fourth proportional pressure solenoid valve arranged to control the engagement movements of said first actuator device when it is in communication with the fluid supply and to control the engagement movements of said second actuator device when it is in communication with the fluid supply; in such a way that a gear change operation requires the intervention of at most four solenoid valves.