Gm Global Technolgoy Operations, Inc.

Todd R Berger

Christopher G Benson

Steven Patrick Moorman

Stephen W Powell

Brian W Whitmarsh

David Chris Webert

Kelly Eber

Mark A Vernacchia

Kevin Michael Dougan

Christopher J Landino

Derril A Loe

Matthew D Whitton

Orson S Wang

Joel H Gunderson

John E Marano

John R Czoykowski

Larry Diemer

Richard Francis Olenzek

Nathaniel E Wilke

Peter Donald Bock

Roberto Diaz

Timothy R Stockdale

Tsunlock A Yu

Ryan M Jenness

Christopher M Kaminski

Ed E Han

Cheol W Kim

Scott B Pollack

Bradford E Vorbeck

Dustin A Nygaard

Dong Da

Steven A Coleman

Joseph V Pittiglio

David H Moiseev

Bradley A Buczkowski

A method for controlling internal electronic range selection for an automatic transmission includes: confirming if a range change command has been ordered from a current transmission operating state; verifying expected performance from at least first and second mode valves and a park servo are present in the current transmission operating state prior to allowing a range change event; during the range change event: generating proactive commands including ordering a reduction in a hydraulic system pressure; and identifying if an unexpected event is detected; and following completion of the range change event confirming expected performance is obtained from at least the first and second mode valves and the park servo to achieve a driver intended state.

Method for controlling the internal electronic range selection for a 9 speed automatic transmission

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 method of operating a motor vehicle transmission includes measuring an operating temperature of the transmission, the transmission having at least seven torque transmitting mechanisms and at least three planetary gear sets, each planetary gear set having three gear members; determining if the transmission is in a park mode; determining if the operating temperature is below a predetermined threshold; if the operating temperature is below the predetermined threshold and the transmission is the park mode, implementing a shift delay mitigation process that includes engaging a fourth torque transmitting mechanism and a firth torque transmitting mechanism of the at least seven torque transmitting mechanisms so that they are locked to a ground to prevent a first gear member of the first planetary gear set from moving, which, in turn, prevents an input torque being transferred to a park pawl.

Transmission with cold shift delay mitigation

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 for a transmission includes a source of pressurized hydraulic fluid that communicates with an electronic transmission range selection (ETRS) subsystem or manual valve and a clutch actuation subsystem.

A vehicle includes an engine, a transmission with a shift valve, an alternator, an auxiliary battery, a voltage sensor operable to measure an auxiliary voltage, and an electronic transmission range selection (ETRS) system. The ETRS system includes a controller, and also an electronic range selector device that transmits an electronic range request signal to the controller to request the shift of the transmission to a requested operating range. The controller executes a method to predict a loss of auxiliary power aboard the vehicle, and to control an action of the vehicle in response to the predicted loss of auxiliary power. The electronic range request signal is received from the range selector device and auxiliary voltage. The controller calculates a slope of a decrease in the measured auxiliary voltage. A control action is executed with the alternator is in the charging state and the calculated slope exceeds a calibrated slope threshold.

Transmission with electronic range selector and pre-emptive power loss control logic

A torque converter hydraulic control subsystem for a transmission is provided. The torque converter hydraulic control subsystem includes a source of pressurized hydraulic fluid that communicates with a torque converter clutch (TCC) regulation valve, a TCC control valve, and a lubrication boost valve. The torque converter hydraulic control subsystem is configured to provide cooling and lubrication fluid flow to a torque converter in all modes of operation.

Torque converter hydraulic control system for an automatic transmission

A system for locking a Park device in a transmission in an out-of-Park mode of operation includes a valve body that defines a bore, a solenoid connected to the valve body, a lock feature disposed in the valve body and interconnected with the solenoid, and a servo piston disposed within the bore of the valve body. The servo piston has a detent and the servo piston is interconnected to the Park device and is moveable between a first position and a second position. The detent is radially aligned with the lock feature when the servo piston is in the first position. Activation of the solenoid locks the lock feature into the detent of the servo piston to lock the Park device of the transmission in the no-Park mode.

Valve integrated park inhibit solenoid assembly

A hydraulic control system for a transmission is provided. The hydraulic control system includes a source of pressurized hydraulic fluid that communicates with a discrete electronic transmission range selection (ETRS) subsystem. The hydraulic control system includes first and second mode valves located downstream of a hydraulic fluid pressure source. The mode valves are supplied with fluid via one or more solenoid valves or other valves. The mode valves have a plurality of ports configured to transfer pressurized hydraulic fluid. The first mode valve transfers pressurized hydraulic fluid from the source to the second mode valve. The second mode valve transfers pressurized hydraulic fluid from the first mode valve to one of drive or reverse. An electro-hydraulic circuit for pulling the transmission out of park and putting the transmission into park is also provided. A park sensor assembly including a Hall Effect sensor switch is also provided.

Discrete mechanism for electronic transmission range selection

A hydraulic control system of an automatic transmission includes a clutch compensator feed circuit that is in communication with clutch apply circuit exhaust fluid. The clutch compensator feed circuit receives exhaust fluid from one or more apply clutches, or other torque transmitting device(s), and feeds the exhaust fluid to the balance side of the clutch or other torque transmitting device. The clutch compensator feed circuit may be open to atmospheric pressure, such that the clutch compensator feed circuit is not pressurized with respect to atmospheric pressure.

Transmission clutch piston compensator feed circuit

A multiple plate friction clutch includes clutch plates or discs having reduced frictional (spin) losses and thus reduced heat generation and improved service life. The clutch plates include both leaf springs or spring tabs at the periphery of the clutch plate that axially bias adjacent plates away from one another and a reduced area of friction material that contacts an adjacent reaction plate. On a typical motor vehicle automatic transmission clutch, a total of six or eight leaf springs or tabs are utilized: with three or four offset to one side and three or four offset to the other side.

Tabbed clutch plates

A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid that communicates with an electronic transmission range selection (ETRS) subsystem. The ETRS subsystem includes an ETRS valve, a park mechanism, a mode valve, a latch valve assembly, and a plurality of solenoids. The ETRS subsystem is configured to provide desired operating conditions during a plurality of potential failure conditions.

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Pinckney, MI, United States of America

Todd R Berger