Patent ID: 8475336

Claim:
A hydraulic control system for controlling a dual clutch transmission, the hydraulic control system comprising: a source of pressurized hydraulic fluid; a first, a second, a third and a fourth variable force solenoid in downstream fluid communication with the source of pressurized hydraulic fluid; a first flow control solenoid in downstream fluid communication with the first variable force solenoid; a second flow control solenoid in downstream fluid communication with the second variable force solenoid; a first clutch actuator in downstream fluid communication with the first flow control solenoid for selectively actuating a first clutch of the dual clutch transmission; a second clutch actuator in downstream fluid communication with the second flow control solenoid for selectively actuating a second clutch of the dual clutch transmission; a first logic valve assembly in downstream fluid communication with the third and the fourth variable force solenoids, wherein the first logic valve assembly has a valve movable between a first and a second position; a second logic valve assembly in downstream fluid communication with the first logic valve assembly, wherein the second logic valve assembly has a valve movable between a first and a second position; a third logic valve assembly in downstream fluid communication with the first logic valve assembly wherein the third logic valve assembly has a valve movable between a first and a second position; a first actuator in downstream fluid communication with the second logic valve assembly, wherein the first actuator is movable between a first and second position when the valve of the first logic control valve assembly is in the first position and the valve of second logic control valve assembly is in the first position; a second actuator in downstream fluid communication with the second logic valve assembly, wherein the second actuator is movable between a first and second position when the valve of the first logic valve assembly is in the first position and the valve of second logic valve assembly is in the second position; a third actuator in downstream fluid communication with the third logic valve assembly, wherein the third actuator is movable between a first and second position when the valve of the first logic valve assembly is in the second position and the valve of third logic valve assembly is in the first position; and a fourth actuator in downstream fluid communication with the third logic valve assembly, wherein the fourth actuator is movable between a first and second position when the valve of the first logic valve assembly is in the second position and the valve of third logic valve assembly is in the second position, and wherein the third variable force solenoid modulates a first hydraulic fluid pressure to move at least one of the four actuators into the first position and the fourth variable force solenoid modulates a second hydraulic fluid pressure to move the at least one of the four actuators into the second position.