Gm Global Technolgoy Operations, Inc.

Timothy Z Jin

Steven Patrick Moorman

Christopher G Benson

Timothy J Reinhart

Chinar S Ghike

Kenneth William Lampert

Brady Stein

Leah Rose Bridson

Patrick Jebson Carroll

A transmission hydraulic control system includes a manual valve, a default valve, and a clutch prime valve. The manual valve allows fluid flow from a pressurized line to a drive line when the manual valve is open (when a transmission is in drive or reverse). The manual valve prevents fluid flow from the pressurized line to the drive line when the manual valve is closed (when the transmission is in neutral or park). The clutch prime valve allows fluid to flow from the pressurized line to the drive line, and thereby bypass the manual valve, when the manual valve is closed and the clutch prime valve is open. The default valve allows fluid bypassing the manual valve to flow to prime a clutch of the transmission when the default valve is open. The clutch prime valve prevents fluid from bypassing the manual valve when the clutch prime valve is closed.

Hydraulic control system for priming clutches of an automatic transmission when the automatic transmission is in park

A hydraulic control system for a motor vehicle transmission includes a pressure regulation subsystem and a manual valve assembly in fluid communication with the pressure regulation subsystem. The manual valve assembly is moveable between at least park, neutral, drive, and reverse positions. A default disable valve assembly is in fluid communication with the manual valve assembly, a default disable solenoid valve assembly, and a default select valve assembly. A one-way valve may be provided to permit hydraulic fluid to flow to a second-priority hydraulic circuit when in a default mode of operation. A combined main regulation and priority valve may be provided to pressurize line pressure as a first priority, pressurize the second-priority hydraulic circuit as a second priority, and to feed excess pressure to a decrease-pressure circuit as a third priority.

Hydraulic control system for an automatic transmission

The present invention provides improved, real time sensing of pressure supplied to the hydraulic operator of a clutch for a motor vehicle driveline power take off. A proportional sensor in the hydraulic line to the power take off clutch actuator provides a data signal in real time of the actual pressure applied to the clutch actuator. This signal is provided to the power take off control module (PCM) and/or to the transmission control module (TCM). The power take off control module, having instantaneous data regarding the pressure applied to the hydraulic operator achieves two important operating functions: monitoring and feedback.

Pressure sensor for power take off

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Pleasant Ridge, MI, United States of America

Timothy Z Jin