Patent ID: 8403792

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, first and second pressure or flow control solenoid valves each having inlets connected to said source of hydraulic fluid and respective first and second outlets, a first logic valve having a first inlet connected to said first output and 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 second logic valve having a first inlet connected to said first outlet of said first logic valve, a second inlet connected to said third outlet, 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 second logic valve and a second port connected to said third outlet of said second logic valve, a second 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 fourth port of said second logic valve, a third logic valve having a first inlet connected to said second outlet of said first logic valve, a second inlet connected to said fourth outlet of said first logic valve, 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 third logic valve and a second port connected to said third port 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 third logic valve and a second port connected to said fourth port of said third logic valve.