Patent ID: 8356529

Claim:
A hydraulic control system for a dual clutch transmission comprising, in combination, a source of pressurized hydraulic fluid including a pump, a pair of pressure control solenoid valves having inputs communicating with said source of hydraulic fluid and a first output and second output independent of said first output, a pair of clutch actuator assemblies each in fluid communication with one of said outputs and including a piston and cylinder assembly and a solenoid valve for selectively supplying hydraulic fluid to said piston and cylinder assembly, a pair of pressure or flow control solenoid valves, one of said pair of valves having a first inlet connected to said first output and having a third output and another of said pair of valves having a second inlet connected to said second output and having a fourth output, a first logic valve having a first inlet connected to said third output and a second inlet connected to said first output, a plurality of exhaust ports, a control port, a first outlet, a second outlet, a third outlet and a fourth outlet, a first gear selection piston and cylinder assembly having a first port connected to said first outlet of said first logic valve and a second port connected to said to said third outlet of said first logic valve, a second gear selection piston and cylinder assembly having a first port connected to said second outlet of said first logic valve and a second port connected to said to said fourth outlet of said second logic valve, a second logic valve having a first inlet connected to said fourth output, a second inlet connected to said second output, a plurality of exhaust ports, a control port, a first outlet, a second outlet, a third outlet and a fourth outlet, a third gear selection piston and cylinder assembly having a first port connected to said first outlet of said second logic valve and a second port connected to said to said third outlet of said second logic valve, and a fourth gear selection piston and cylinder assembly having a first port connected to said second outlet of said second logic valve and a second port connected to said to said fourth outlet of said second logic valve.