Gm Global Technolgoy Operations, Inc.

Allison Transmission, Inc.

Bayerische Motoren Werke Aktiengesellschaft

Daimler Chrysler Ag

Daimler Ag

Chrysler Corporation

Daimlerchrysler Corporation

Eric S Tryon

Charles Francis Long

Bryan H Hagelskamp

Brian Schoolcraft

Michael D Foster

David Earl Earhart

Jy-Jen F Sah

William S Reed

Matthew R Knoth

Michael Foster

Ali K Naqvi

Joel E Mowatt

Timothy J Reinhart

Douglas S Burchett

Goro Tamai

James Allen Raszkowski

Lawrence A Kaminsky

Kenneth D Schoch

Grantland I Kingman

Scott A Miller

Kevin P Coleman

Michael J E Richardson

Christopher J Bowes

Steven J Shepherd

Richard L Wagner

Scott T Weisgerber

Patrick M Prihoda

William A Stewart

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

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and six selective couplers. The six selective couplers may include three clutches and three brakes.

Multi-speed planetary transmission

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and six selective couplers. The six selective couplers may include four clutches and two brakes or three clutches and three brakes.

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and six selective couplers. The six selective couplers may include four clutches and two brakes.

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Indianapolis, IN, United States of America

Eric S Tryon