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:
Aug. 27, 2002
Filed:
Sep. 04, 2001
Lynn Edward Davison, Saline, MI (US);
Arthur Joseph Varady, Chelsea, MI (US);
Cheryl Jeanette Stark, Canton, MI (US);
John Michael Kacewicz, Riverview, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
Methods of utilizing engine crankshaft acceleration to monitor cold start spark retard are presented. A first method utilizes a variance in a crankshaft acceleration based deviation signal and looks for changes in the variance to confirm if cold spark retard has occurred by the ignition system. In a second method, a threshold level of a group of cylinder crankshaft acceleration deviation signals &Dgr;, can be detected and compared to a level of crankshaft deviant acceleration when normal spark is commanded to determine if commanded spark retard has been realized.