Patent ID: 9574654
Date: 2017-02-21
CPC Classifications: F16H,Y10T

Claim:
1. A hydraulic control system for a continuously variable transmission, the transmission having a parking mechanism, a first torque transmitting device, a second torque transmitting device, a primary moveable pulley, and a secondary moveable pulley, the hydraulic control system comprising: a pressure regulator subsystem providing a pressurized hydraulic fluid; a pulley ratio control subsystem in downstream fluid communication with the pressure regulator subsystem and configured to control the pressurized hydraulic fluid to the primary moveable pulley and the secondary moveable pulley; an enablement valve assembly in downstream communication with the pressure regulator subsystem, wherein the enablement valve assembly selective communicates the pressurized hydraulic fluid there through; a first mode valve assembly in downstream communication with the enablement valve assembly; a second mode valve assembly in downstream communication with the first mode valve assembly; a first clutch actuator for selectively engaging a first torque transmitting device, the first clutch actuator in downstream fluid communication with the second mode valve assembly; a second clutch actuator for selectively engaging a second torque transmitting device, the second clutch actuator in downstream fluid communication with the second mode valve assembly; a park servo in downstream fluid communication with both the first mode valve assembly and the second mode valve assembly, the park servo mechanically connected to the parking mechanism.