Electrohydraulic drive control system for vehicle double clutch transmission - uses three switching cylinders each with central neutral pressure space and two end gear switching pressure spaces

摘要

The drive control system has three switching cylinders (11, 12, 13), each with a piston rod moved between three different switch positions, the two end positions corresponding to the switch positions for a respective gear and the middle position corresponding to the neutral position. The switching cylinders (11, 12, 13) each have three pressure spaces (42, 47, 44; 45, 48, 41; 46, 49, 43). The third pressure space (47, 48, 49) for the neutral position lies between the end pressure spaces (42, 44; 45, 41; 46, 43). All the pressure lines for the switching cylinders (11, 12, 13) are supplied via two blocking valves (31, 32) with a separate pressure suply for the neutral position pressure space (47, 48, 49) and for the gear switch positions of each switching cylinder (11, 12, 13). ADVANTAGE - Fail-safe characteristic, simplified design.