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. 28, 2008
Filed:
Jul. 20, 2005
Katsushi Hashizume, Gamagori, JP;
Katsushi Hashizume, Gamagori, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A crank angle sensor outputs a pulse signal whenever a crankshaft rotates a predetermined angle. An ECU performs an elimination process on a sequence of pulse signals to obtain a remaining signal used to determine the crank angle. When the rotation speed of the crankshaft becomes lower than a predetermined threshold, the ECU suspends the elimination process and determines the crank angle using pulse signals that have not undergone the elimination process. The ECU detects reverse rotation of the crankshaft based on pulse signals that have not undergone the elimination process. A crank counter is operated in synchronism with the falling of a pulse signal when the crankshaft rotates in the forward direction and is operated in synchronism with the rising of a pulse signal when the crankshaft rotates in the reverse direction.