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. 31, 1998
Filed:
Jul. 11, 1996
Youichi Kishimoto, Chigasaki, JP;
Toshio Takahata, Kanagawa, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
A mechanism is provided for outputting reference signals in synchronism with the firing action of the cylinders of a multi cylinder engine. Correction coefficients are calculated for correcting deviations in the periods between the cylinders from the periods of the reference signals which are obtained during the fuel cut off state. The periods of the reference signals for each cylinder are corrected according to these correction coefficients, and the presence or absence of misfiring for each cylinder is determined from the corrected periods. On the one hand the determination of misfiring is prevented when input of external interference to the engine is present, and on the other hand the learning of the correction coefficients is prevented when instability has occurred in the reference signals during the fuel cut off state. Since the learning of the correction coefficients is prevented in different circumstances from those in which the determination of misfiring is prevented, the learning accuracy for the correction coefficients is elevated.