Clutch and torque converter control for a continuously variable transmission

摘要

A hydraulic control system with clutch and torque converter control for a CVT includes a pressure regulator subsystem, a cooler subsystem, a manual valve assembly, and a torque converter control valve assembly connected to the torque converter clutch (TCC) and the cooler subsystem. A boost valve assembly is connected to the pressure regulator subsystem, the manual valve assembly, and the torque converter clutch control valve assembly. A clutch control solenoid is configured to move the boost valve to the boost position and the control valve to the release position and to control a pressure of the hydraulic fluid provided to the manual valve assembly. A TCC control solenoid is configured to move the boost valve to the boost position and to control a pressure of the hydraulic fluid provided to the torque converter control valve assembly.

主权项

1. A hydraulic control system for a powertrain in a motor vehicle, the powertrain having a torque converter with a torque converter clutch (TCC) connectable with a continuously variable transmission, the transmission having a forward clutch and a reverse clutch, the hydraulic control system comprising:
a pressure regulator subsystem providing a pressurized hydraulic fluid; a cooler subsystem for reducing a temperature of the pressurized hydraulic fluid; a manual valve assembly configured to selectively communicate the pressurized hydraulic fluid to the forward clutch and the reverse clutch; a torque converter control valve assembly connected to the TCC and the cooler subsystem, wherein the torque converter control valve assembly includes a control valve moveable between an apply position that allows pressurized hydraulic fluid to communicate with an apply side of the TCC and a release position that allows pressurized hydraulic fluid to communicate with a release side of the TCC and then to the cooler subsystem; a boost valve assembly connected to the pressure regulator subsystem, the manual valve assembly, and the torque converter clutch control valve assembly, wherein the boost valve assembly includes a boost valve moveable between a boost position that allows pressurized hydraulic fluid from the pressure regulator subsystem to communicate with the manual valve, and a failsafe position that allows pressurized hydraulic fluid from the pressure regulator subsystem to communicate with the torque converter control valve assembly through to the cooler subsystem; a clutch control solenoid configured to move the boost valve to the boost position and the control valve to the release position and to control a pressure of the hydraulic fluid provided to the manual valve assembly; and a TCC control solenoid configured to move the boost valve to the boost position and to control a pressure of the hydraulic fluid provided to the torque converter control valve assembly.