Patent ID: 8429994
Filing Date: 2013-04-30
Classification: F16D,F16H,Y10T

Abstract:
1. A hydraulic control system for a dual clutch transmission comprising, in combination, a source of pressurized hydraulic fluid having a pump, a pressure control device having an inlet communicating with said source of hydraulic fluid and a pressure outlet, a first clutch actuator assembly in fluid communication with said pressure outlet and including a first piston and cylinder assembly and a first solenoid valve for selectively supplying hydraulic fluid to said first piston and cylinder assembly, a second clutch actuator assembly in fluid communication with said pressure outlet and including a second piston and cylinder assembly and a second solenoid valve for selectively supplying hydraulic fluid to said second piston and cylinder assembly, a first pressure or flow control solenoid valve having an inlet connected to said pressure outlet and an outlet, a second pressure or flow control solenoid valve having an inlet connected to said pressure outlet and an outlet, a first logic valve having a first inlet connected to said outlet of said first pressure or flow control solenoid and a second inlet connected to said outlet of said second pressure control solenoid valve, a plurality of exhaust ports, a control port, a first outlet, a second outlet, a third outlet and a fourth outlet, a third solenoid valve for selectively providing hydraulic fluid to said control port of said first logic valve, 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 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 fourth solenoid valve for selectively providing hydraulic fluid to said control port of said second logic valve, 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 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 to said fourth outlet of said second logic valve, a third logic valve having a first inlet connected to said fourth outlet of said first logic valve and a second inlet connected to said second 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 solenoid valve for selectively providing hydraulic fluid to said control port of said third logic valve, 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 to said third outlet of said third logic valve, a fourth logic valve having a first inlet connected to said second outlet of said third logic valve and a second inlet connected to said fourth outlet of said third logic valve, a plurality of exhaust ports, a control port, a first outlet, a second outlet, a third outlet and a fourth outlet, a fourth gear selection piston and cylinder assembly having a first port connected to said first outlet of said fourth logic valve and a second port connected to said third outlet of said fourth logic valve, and a fifth gear selection piston and cylinder assembly having a first port connected to said second outlet of said fourth logic valve and a second port connected to said to said fourth outlet of said fourth logic valve.