Latching clutch control system

摘要

A system is provided for latching and draining a torque transmitting device. The system may include a clutch feed channel having an inlet portion and a clutch portion. The inlet portion is configured to provide hydraulic fluid from a pressurized source to the clutch portion. The clutch portion is configured to provide hydraulic fluid to a torque transmitting device. An inlet valve connects the inlet portion of the clutch feed channel to the clutch portion of the clutch feed channel. The inlet valve is configured to open to allow the hydraulic fluid to flow from the inlet portion to the clutch portion when the torque transmitting device is engaged. The inlet valve is configured to close and to trap hydraulic fluid within the torque transmitting device when the torque transmitting device is not actively pressurized. A multispeed transmission is also provided.

主权项

1. A hydraulic fluid latching system for a torque transmitting device of a vehicular transmission, the hydraulic fluid latching system comprising:
a clutch feed channel having an inlet portion and a clutch portion, the inlet portion configured to provide hydraulic fluid from a pressurized source to the clutch portion, the clutch portion being configured to provide hydraulic fluid to a torque transmitting device; and a one-way inlet valve hydraulically connecting the inlet portion of the clutch feed channel to the clutch portion of the clutch feed channel, and wherein the one-way inlet valve allows hydraulic fluid to flow from the inlet portion to the clutch portion when the torque transmitting device is engaged, to close and to trap hydraulic fluid within the torque transmitting device when the torque transmitting device is not actively pressurized through the inlet portion, to open when the pressure of hydraulic fluid within the inlet portion of the clutch feed channel exceeds the pressure of hydraulic fluid within the clutch portion of the clutch feed channel, and to close when the pressure of the hydraulic fluid in the clutch portion of the clutch feed channel exceeds the pressure of the hydraulic fluid in the inlet portion of the clutch feed channel, and a bypass valve configured to selectively open to drain fluid from clutch portion of the clutch feed channel.