Patent ID: 8932167
Filing Date: 2015-01-13
Classification: F16H,Y10T

Abstract:
1. A hydraulic control system for a transmission, the transmission having six torque transmitting devices and one selectable one-way clutch selectively engageable to provide nine forward speed ratios and at least one reverse speed ratio, the hydraulic control system comprising: a pressure regulator subsystem for providing a pressurized hydraulic fluid; a range selection subsystem in downstream fluid communication with the pressure regulator subsystem and having first and second outputs; a first control device in downstream fluid communication with the pressure regulator subsystem; a clutch select valve assembly in downstream fluid communication with the first and second outputs and the first control device, wherein the clutch select valve assembly operates in first and second states; a servo in downstream fluid communication with the clutch select valve assembly for actuating a selectable one-way clutch; a first actuator in downstream fluid communication with the clutch select valve assembly for actuating a first torque transmitting mechanism; a second actuator in downstream fluid communication with the clutch select valve assembly for actuating a second torque transmitting mechanism; and third, fourth, fifth, and sixth actuators in downstream fluid communication with the pressure regulator subsystem each for actuating one of a third, fourth, fifth, and sixth torque transmitting mechanisms, wherein the clutch select valve assembly transmits pressurized hydraulic fluid from the first output to the servo and from the first control device to the first actuator when in the first state and wherein the clutch valve assembly transmits pressurized hydraulic fluid from the first control device to the servo and from the second output to the second actuator when in the second state.