Caterpillar Inc.

Sean E Carey

Charles W Birchenough

Jeffrey A Champa

A method and apparatus is configured for calibrating a fluid retarder in a transmission system. The transmission system may include an engine connected to a transmission through a driveshaft or power input shaft. The driveshaft is mechanically connected to the fluid retarder The fluid retarder includes a rotor mechanically connected to the driveshaft and a retarder valve adapted to enable fluid flow across the rotor The method includes the steps of delivering a valve command to the retarder valve, determining a speed of the engine, and calibrating the retarder valve in response to the engine speed, and the valve command.

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Bloomington, IL, United States of America

Sean E Carey