The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2002
Filed:
Oct. 29, 1999
Charles W. Birchenough, Morton, IL (US);
Sean E. Carey, Bloomington, IL (US);
Jeffrey A. Champa, Washington, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
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.