Patent ID: 9249844
Filing Date: 2016-02-02
CPC Classification: F16D,F16H

Claim Text:
1. A hydraulic fluid latching system for a torque transmitting device of a transmission of a motor vehicle having an engine, the hydraulic fluid latching system comprising: a clutch feed channel having an inlet portion and a clutch portion, and wherein the clutch feed channel is configured to provide hydraulic fluid from a pressurized source to the torque transmitting device when the torque transmitting device is engaged and the engine is running; a latching valve connecting the clutch feed channel to the torque transmitting device, the latching valve configured to selectively trap pressurized hydraulic fluid within the torque transmitting device; a hydraulic pressure storage circuit having an accumulator and an inlet valve, and wherein pressurized hydraulic fluid is stored in the accumulator when the engine is on, the inlet valve connects the inlet portion of the clutch feed channel to the clutch portion of the clutch feed channel, the clutch portion of the clutch feed channel is in communication with the latching valve, the inlet portion of the clutch feed channel is in communication with the source of pressurized hydraulic fluid, and the hydraulic pressure storage circuit configured to selectively provide the pressurized hydraulic fluid stored in the accumulator to the latching valve to unlatch the latching valve, and a release valve configured to selectively hold the pressurized hydraulic fluid within the accumulator, the release valve being configured to selectively open to allow the pressurized hydraulic fluid to flow from the accumulator to the latching valve to unlatch the latching valve; and wherein the inlet valve of the hydraulic pressure storage circuit is normally open to allow pressurized hydraulic fluid to flow from the inlet portion of the clutch feed channel to the clutch portion clutch feed channel when the torque transmitting device is engaged and the hydraulic pressure storage circuit is configured to close the inlet valve to unlatch the latching valve.