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. 10, 1997
Filed:
Jan. 04, 1995
Gregory R White, Columbus, IN (US);
Bryan S Gatewood, Westport, IN (US);
Mark L Wilson, Columbus, IN (US);
Peter J Griffen, North Yorkshire, GB;
Dennis Schwaiger, Whitmore Lake, MI (US);
Cummins Engine Company, Inc., Columbus, IN (US);
Abstract
An electronic engine control monitors engine speed, vehicle speed and determines various engine RPM values and RPM ranges used in fueling a molar vehicle engine to achieve desired engine speeds prior to and during an automatic gear shift sequence. The engine is coupled to a manual/automatic transmission that includes manually selectable gear operation modes and automatically selectable gear operation modes. In order to assist gear engagement of the automatically selectable gears, the engine is fueled to a series of predetermined RPM levels to rock the transmission gears into engagement. In so doing, throttle control by the operator is first inhibited and the engine is first governed to a synchronous RPM value. Throttle control is returned to the operator if gear engagement is verified within a first predetermined delay period. If gear engagement is not verified, the engine RPM is periodically increased or decreased, depending on whether an upshift or downshift is attempted, and throttle control is returned to the operator if gear engagement is verified within a second or third predetermined delay period. If gear engagement is still not verified, the engine RPM is returned to the synchronous RPM value for a fourth predetermined delay period. If gear engagement does not occur within the fourth delay period, an error recovery routine is executed.