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:
Apr. 12, 2011
Filed:
Feb. 03, 2009
Yoshiya Omuro, Saitama, JP;
Katsuhiro Ouchi, Saitama, JP;
Yoshiya Omuro, Saitama, JP;
Katsuhiro Ouchi, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A method and a system for detecting a crank angle of an engine includes detecting a non-toothed portion of a crank pulse rotor during a inlet valve open period for preventing falsely recognizing compression top dead center as a position of the non-toothed portion. A crank angle sensor is arranged at a position facing an outer circumference of a crank pulse rotor including a non-toothed portion thereof. An interval calculating unit measures crank pulse time intervals between adjacent teeth based on a sensing signal received from the crank angle sensor. The measured successive crank pulse time intervals are compared for detection of the non-toothed portion. A ratio calculating unit calculates a ratio of crank pulse intervals. A maximum ratio detecting unit determines presence of the non-toothed portion when the calculated ratio of crank pulse interval is the maximum in the cycle of the engine.