Patent ID: 8402855
Filing Date: 2013-03-26
Classification: 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 first pressure control solenoid valve having an inlet connected to said source of hydraulic fluid and a first outlet, a first clutch actuator assembly in fluid communication with said first 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 first 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 second pressure control solenoid valve having an inlet connected to said source of hydraulic fluid and a second outlet, a first two position solenoid valve having an inlet connected to said second outlet and an outlet, a first pressure or flow control solenoid valve having an inlet connected to said second outlet and having an outlet, a second pressure or flow control solenoid valve having an inlet connected to said second outlet and having an outlet, a first logic valve having a first inlet port connected to said outlet of said first two position solenoid valve, a second inlet port connected to said outlet of said first pressure or flow control solenoid and a third inlet port connected to said outlet of said second pressure or flow control solenoid valve, a plurality of exhaust ports, a control port, a first outlet port, a second outlet port, a third outlet port, a fourth outlet port, a fifth outlet port and a sixth outlet port, a second two position solenoid valve having an inlet connected to said second outlet and an outlet connected to said control port of said first logic valve, a second logic valve having a first inlet port connected to said third outlet port of said first logic valve, a control port connected to said first outlet port of said first logic valve, a first outlet port and a second outlet port, a first gear selection piston and cylinder assembly having a first port connected to said first outlet port of said second logic valve and a second port connected to said to said fifth outlet of port said first logic valve, a second gear selection piston and cylinder assembly having a first port connected to said second outlet port of said second logic valve and a second port connected to said to said control port of said second logic valve, a third logic valve having an inlet port connected to said sixth outlet port of said first logic valve, a control port connected to said second outlet port of said first logic valve, a first outlet port and a second outlet port, a third gear selection piston and cylinder assembly having a first port connected to said second outlet port of said third logic valve and a second port connected to said to said control port of said third logic valve, a fourth logic valve having a first inlet port connected to said fourth outlet port of said first logic valve and a second inlet port connected to said first outlet port of said third logic valve, a plurality of exhaust ports, a control port, a first outlet port, a second outlet port, a third outlet port and a fourth outlet port, a third two position solenoid valve having an inlet connected to said second outlet and an outlet connected to said control port of said fourth logic valve, a fourth gear selection piston and cylinder assembly having a first port connected to said first outlet port of said fourth logic valve and a second port connected to said third outlet port of said fourth logic valve, and a fifth gear selection piston and cylinder assembly having a first port connected to said second outlet port of said fourth logic valve and a second port connected to said to said fourth outlet port of said fourth logic valve.