Allison Transmission, Inc.

Gm Global Technology Operations LLC

Charles Francis Long

Darren J Weber

Charles T Taylor

Phillip F McCauley

John William Edward Fuller

Martin Robert Dadel

Bryan H Hagelskamp

Jeffrey J Cole

Michael D Foster

Eric S Tryon

Stephen William Murray

John W E Fuller

John William Fuller

Jeffrey Kurt Runde

Thomas H Wilson

Phillip F Mc Cauley

Travis A Brown

David C Ames

Brian Schoolcraft

Gregory A Hubbard

Michael Foster

Jeffrey E Shultz

Todd M Steinmetz

Scott E Mundy

Michael L Duhaime

Jason Ellis

Randall S Conn

Thomas A Wright

Dennis M Cooke

Claire Etchason

Jacob Hoeschen

Steven Patrick Moorman

Sean E Gleason

Joel E Mowatt

Drew A Crafton

Carl A Lentz

Michael Rietdorf

Clifford H Oehme

Bradley L McCafferty

Richard H Price

Michael F King

Katherine M Klemen

Robert C Boyer

Robert Clinton Utter

John D Slaubaugh

J Curt Vapor

Lawrence E Dewey

Randall R Kirk

William J Summers

Duane E Colter

Mark A Rader

Phillip Mccauley

Stephen Murray

An electro-hydraulic control system for a multispeed transmission having a plurality of torque-transmitting mechanisms includes a controller for operably controlling the transmission, a fluid source for supplying hydraulic fluid, and a plurality of torque-transmitting mechanisms being operably selected between an applied and an unapplied state to achieve a plurality of ranges including at least one reverse, a neutral, and a plurality of forward ranges. The system includes a plurality of trim systems having pressure control solenoids and trim valves. The system may also include one or more shift valves disposed in fluid communication with the fluid source and being capable of moving between stroked and de-stroked positions. In any given range, only two of the plurality of torque-transmitting mechanisms may be applied. Moreover, three of the plurality of pressure control solenoids are normally high solenoids, and the remaining solenoids are normally low solenoids.

Control system and method thereof for multispeed transmission

Transmissions, park systems, and methods of operating transmissions are disclosed. A transmission includes an input shaft to receive torque from a drive unit, an output shaft to transmit torque to a load, and a park system to selectively brake the output shaft. The park system includes a park gear assembly, an actuator valve, and an actuation linkage coupled between the actuator valve and the park gear assembly.

Hydraulic park-by-wire shift systems, transmissions incorporating the same, and methods for transmissions

Systems and methods are provided for controlling a transmission. An engine stop-start event may be allowed or denied based on one or more characteristics of the vehicle including the transmission.

System and method for controlling engine stop-start events

A hydraulic system of a transmission having a controller and a variable displacement pump. The pump includes an inlet and outlet and is adapted to be driven by a torque-generating mechanism. The system also includes a lube circuit fluidly coupled to the pump. A lube regulator valve is disposed in the lube circuit, such that the lube regulator valve is configured to move between at least a regulated position and an unregulated position. The regulated position corresponds to a regulated pressure in the lube circuit. A pressure switch is fluidly coupled to the lube regulator valve and configured to move between a first position and a second position, where the switch is disposed in electrical communication with the controller. A solenoid is disposed in electrical communication with the controller and is controllably coupled to the pump to alter the displacement of the pump.

System and method for controlling pump performance in a transmission

A transmission system includes a fluid-coupling device, an electro-hydraulic control system, and a clutch. The fluid-coupling device includes an input coupled to an impeller, an output coupled to a turbine, and a stator disposed between the impeller and the turbine. The electro-hydraulic control system includes a flow valve disposed in fluid communication with the input and the output of the fluid-coupling device that is movable between at least a first position and a second position, at least one trim valve system fluidly coupled to the flow valve, and a solenoid disposed in fluid communication with the flow valve that is electrically controllable between an energized state and a de-energized state. The clutch is disposable in fluid communication with the flow valve and controllable between an applied position and an unapplied position.

Dual clutch control system for integral torque converter and retarder and method thereof

An apparatus and method of controlling a torque transmitting apparatus having multiple selectively engageable couplers is provided. The multiple couplers may be selectively engaged and disengaged to provide a mechanical, friction or fluid coupling between portions of the torque transmitting apparatus and other components of a vehicle powertrain during various operational stages. The control apparatus includes a fluid pressure control device and a fluid flow control device.

Control for torque converter having multiple selectively engageable converter couplers

The present disclosure is related to a transmission for a powered vehicle. The transmission includes a housing defining an interior of the transmission and a fluid supply portion disposed in the housing. The fluid supply portion is configured to supply fluid throughout the transmission. The transmission also includes a first fluid circuit disposed within the housing and defining a first fluid path in fluid communication with the fluid supply portion. A second fluid circuit fluidly defines a second fluid path in fluid communication with the fluid supply portion. The transmission further includes a coupling mechanism for fluidly coupling the first fluid circuit and second fluid circuit, wherein the second fluid circuit is disposed outside the housing of the transmission.

External lube system for a transmission

An auxiliary hydraulic pressurization system for use with a vehicle including a transmission having a hydraulic reservoir, a hydraulic circuit, and a main pump may include an auxiliary pump and a controller. The auxiliary pump has a low side adapted to be coupled to the hydraulic reservoir and a high side adapted to be coupled to the hydraulic circuit. The controller is electrically connectable to the auxiliary pump and is configured to turn on the auxiliary pump in response to receipt of a signal indicating that the vehicle is in a stop condition to maintain hydraulic pressurization of the hydraulic circuit of the transmission when the vehicle is in the stop condition.

Engine-off auxiliary hydraulic pressurization system and method for a transmission

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Pittsboro, IN, United States of America

Charles Francis Long