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:
Feb. 15, 2011
Filed:
Nov. 24, 2008
Kenichi Machida, Saitama, JP;
Katsuhiro Ouchi, Saitama, JP;
Kenichi Machida, Saitama, JP;
Katsuhiro Ouchi, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A stroke detection apparatus performs a stroke detection of 4-cycle engine based on a rotary engine speed when a throttle opening is large. A first crank-pulse time interval between a crank pulse inputted before a top dead center by 30°, and a crank pulse of the top dead center is measured by a pulse-interval calculation unit, and at the same time, a second crank-pulse time interval between a crank pulse inputted after the top dead center by 60° and a crank pulse inputted after the top dead center 90° is measured. An interval difference calculation unit calculates time-interval difference by subtracting the second crank-pulse time interval from the first crank-pulse time interval, for two continuous top dead centers. A stroke detection unit determines whether two top dead centers are a compression top dead center or an exhaust top dead center based on magnitudes of the time-interval differences.