Gm Global Technolgoy Operations, Inc.

Nathan A Schmidt

Paul G Otanez

Bret M Olson

Ronald F Lochocki, Jr

Christopher Jay Weingartz

Greg J Perantoni

Stuart W Parker

Mary M Whitley

An apparatus for ratio control of a continuously variable transmission includes a driver commanded ratio unit outputting a signal defining a commanded ratio. A clamp control portion is in communication with the driver commanded ratio unit. The clamp control portion includes: a ratio limits and override ring selecting a ratio matching the commanded ratio from an executable functions having stored ratio code data; a screening monitor continuously receiving output from the executable functions and using an input from a vehicle speed signal to compute minimum and maximum ratio limits for the ratio selected by the ratio limits and override ring; and a ratio control execution ring in communication with the screening monitor. The ratio control execution ring calculates a range of pressures allowed for operation of both primary and secondary pulleys of the continuously variable transmission.

Method and apparatus for ratio control for a continuously variable transmission

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South Lyon, MI, United States of America

Nathan A Schmidt