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:
Oct. 22, 1991
Filed:
Jul. 20, 1989
Jeffery L Vajgart, Corunna, MI (US);
Peter W Misangyi, Novi, MI (US);
Parshuram G Date, Novi, MI (US);
Roger S Heitzeg, Dearborn Heights, MI (US);
Noel A Walker, Royal Oak, MI (US);
David A McNamara, Saline, MI (US);
Joe C Attard, Dearborn, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
Engine lubricating oil temperature and the amount of engine usage are used to calculate when engine lubricating oil has reached the end of its predicted wear life. Each spark (engine speed) pulse is multiplied by weighting factors that are periodically determined by sampling the engine oil temperature and the length of time the engine has been in continuous use above a predetermined speed. When the value of the accumulated weighted spark pulses has reached a predetermined level, a warning signal is provided to indicate the necessity of changing the engine lubricating oil.