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. 17, 2009
Filed:
Feb. 24, 2006
Hikokazu Akimoto, Nishikamo-gun, JP;
Osamu Harada, Toyota, JP;
Takahiro Nishigaki, Nagoya, JP;
Akihiro Katayama, Toyota, JP;
Hikokazu Akimoto, Nishikamo-gun, JP;
Osamu Harada, Toyota, JP;
Takahiro Nishigaki, Nagoya, JP;
Akihiro Katayama, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The engine misfire detection apparatus of the invention successively determines whether a rotational fluctuation difference Nxdas a difference between a rotational fluctuation Nxd at a certain crank angle CA of an engine and a rotational fluctuation Nxd at a 360 degree-prior crank angle CA exceeds a predetermined reference value A(step S) and whether a rotational fluctuation difference Nxdas a difference between the rotational fluctuation Nxd at the certain crank angle CA and a rotational fluctuation Nxd at a 720 degree-prior crank angle CA exceeds a predetermined reference value B(step S). The engine misfire detection apparatus detects a misfire of the engine upon satisfaction of all conditions regarding rotational fluctuation difference proportions Nja, Nja, and Njaon the basis of the rotational fluctuation difference Nxd(step S) and all conditions regarding rotational fluctuation difference proportions Njb, Njb, and Njbon the basis of the rotational fluctuation difference Nxd(step S), when both the rotational fluctuation differences Nxdand Nxdexceed the respective reference values Aand B(steps Sand S). This arrangement ensures adequate and accurate detection of an engine misfire during warm-up of a catalyst included in an exhaust emission control unit with a significant delay of the ignition timing in the engine.