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:
Jul. 26, 2005
Filed:
Nov. 05, 2003
Hiroshi Katoh, Yokohama, JP;
Ritsuo Sato, Yokohama, JP;
Hiroshi Katoh, Yokohama, JP;
Ritsuo Sato, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A spark ignition internal combustion engine () performs ignition within a fixed ignition crank angle range. The operation control device comprises a programmable controller () and a unit crank angle sensor () outputting a unit crank angle signal on each unit crank angle. The controller () calculates the engine rotation speed based on the unit crank angle signals (S). By preventing the calculation of the engine rotation speed based on the unit crank angle signals detected in the ignition crank angle range, errors in the calculation of the engine rotation speed resulting from engine ignition noise are eliminated and a precise engine rotation speed is obtained.