Gm Global Technolgoy Operations, Inc.

Kelly Eber

Todd R Berger

Christopher G Benson

Steven Patrick Moorman

Ryan M Jenness

Christopher M Kaminski

Cheol W Kim

A hydraulic control system for a transmission of a motor vehicle includes a source of pressurized hydraulic fluid that communicates with an analog electronic transmission range selection (ETRS) subsystem or a manual valve. The ETRS subsystem includes an ETRS valve, a park servo, a park mechanism, a mode valve, and a plurality of solenoids. The ETRS and manual valve communicate with a clutch actuator subsystem that engages a one-way clutch and six clutches/brakes.

Hydraulic control system for an automatic transmission

A solenoid assembly is disposed in a bore of a valve body where the bore includes a plurality of ports. The solenoid assembly includes a bushing or sleeve disposed in the bore. The sleeve has at least one slot that is aligned with at least one of the plurality of ports. A valve is slidably disposed within the sleeve. A solenoid has a movable armature configured to move the valve.

Normally high acting linear force solenoid

A one-way clutch includes a clutch body and body bore. A clutch plate stack includes first, second, and third clutch plates, the first and third clutch plates fixed to the clutch body. The second clutch plate rotates axially on a longitudinal axis. The first clutch plate includes a first strut cavity and the second clutch plate includes a second strut cavity. A forward strut is rotatably connected to the second clutch plate and biased toward the first clutch plate. The forward strut when positioned in the first strut cavity defines a clutch engaged position preventing second clutch plate rotation in a first rotational direction, while allowing rotation in a second rotational direction. A reverse strut slidably disposed in a strut bore extends through the third clutch plate, is partially positioned in the second strut cavity and is displaced in the strut bore during rotation of the second clutch plate.

Selectable one-way clutch with torque independent release element

A hydraulic control system is provided for controlling the actuation of a plurality of torque transmitting mechanisms. The hydraulic control system includes an accumulator having parallel feed paths to the plurality of torque transmitting mechanisms.

Transmission hydraulic control system having an automatic engine stop-start accumulator

A vehicle includes an engine and transmission. A first rotating clutch engages as an oncoming clutch during a predetermined shift maneuver having a total required clutch energy. A second rotating clutch acts as a holding clutch. A third rotating clutch engages as an additional oncoming clutch during the shift maneuver to share clutch energy with the first rotating clutch. The third rotating clutch, when not engaged, has a zero slip speed relative to the input member. A method includes building a shift table for a transmission design, including identifying slip speed ratios, with respect to the input member, for each clutch, and selecting, from the shift table, a direct drive or other gear state in which three of the rotating clutches are simultaneously operating at a zero slip speed ratio with respect to the input member. The third rotating clutch engages during the shift maneuver.

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Oxford, MI, United States of America

Kelly Eber