Patent ID: 8443687
Filing Date: 2013-05-21
Classification: F16D,F16H,Y10T

Abstract:
1. A hydraulic control system for controlling a dual clutch transmission, the hydraulic control system comprising: a source of pressurized hydraulic fluid; a dual clutch control subsystem in downstream fluid communication with the source of pressurized hydraulic fluid and operable to selectively engage the dual clutch; a pressure control solenoid in downstream fluid communication with the source of pressurized hydraulic fluid; a first flow control solenoid in downstream fluid communication with the pressure control solenoid; a valve assembly in downstream fluid communication with the first flow control solenoid and the pressure control solenoid, wherein the valve assembly has a valve movable between a first and a second position; a second flow control solenoid in downstream fluid communication with the valve assembly; a third flow control solenoid in downstream fluid communication with the valve assembly; a first actuator in downstream fluid communication with the second flow control solenoid and the valve assembly, wherein the first actuator is movable between a first and second position when the valve of the valve assembly is in the second position; a second actuator in downstream fluid communication with the valve assembly, wherein the second actuator is movable between a first and second position when the valve of the valve assembly is in the second position; a third actuator in downstream fluid communication with the valve assembly, wherein the third actuator is movable between a first and second position when the valve of the valve assembly is in the first position; and a fourth actuator in downstream fluid communication with the valve assembly and the third flow control solenoid, wherein the fourth actuator is movable between a first and second position when the valve of the valve assembly is in the first position, wherein the pressure control solenoid generates a first hydraulic fluid pressure to move at least one of the third and fourth actuators into the second position when the valve is in the first position and to move at least one of the first and second actuators into the second position when the valve is in the second position, wherein the first flow control solenoid generates a first flow of hydraulic fluid to move at least one of the second and third actuators into the first position, the second flow control solenoid generates a second flow of hydraulic fluid to move the first actuator into the first position and the third flow control solenoid generates a third flow of hydraulic fluid to move the fourth actuator into the first position, and wherein selective engagement of the first, second, third, and fourth actuators and selective engagement of the dual clutch by the dual clutch control subsystem controls the transmission.