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:
Mar. 17, 2015
Filed:
Apr. 12, 2012
Salem Ahmad Fayyad, Grand Blanc, MI (US);
Andy Tenka, Ypsilanti, MI (US);
Sergio Quelhas, Ann Arbor, MI (US);
Salem Ahmad Fayyad, Grand Blanc, MI (US);
Andy Tenka, Ypsilanti, MI (US);
Sergio Quelhas, Ann Arbor, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A method of detecting a crank signal error that includes incrementing a crank tooth counter in response to detecting a crank signal, comparing the crank tooth counter to an expected value when a cam signal is detected, and indicating a crank signal error if the crank tooth counter is not substantially equal to the expected value. This method is advantageous because a cam interval used to determine when to start and stop counting crank tooth pulses is automatically adjusted for variations in engine speed, while the prior art time based methods must adjust the time interval for variations in engine speed.