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. 23, 2013
Filed:
Nov. 26, 2009
Toshihiro Kato, Toyota, JP;
Toshihiro Kato, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An EG-ECU suspends fuel cutoff when the fuel cutoff is being carried out and the engine speed NE becomes lower than or equal to the resumption engine speed NErtn. The EG-ECU forcibly opens and closes an EGR valve when the fuel cutoff is being carried out, and performs abnormality diagnosis for an EGR device based on a change amount of pressure in an intake pipe caused by opening and closing the EGR valve. The EG-ECU suspends the diagnosis when the diagnosis is being carried out and the engine speed NE becomes lower than or equal to a forcible suspension engine speed NEoff. When the diagnosis is being performed, the EG-ECU sets the forcible suspension engine speed NEoff to a smaller value when the EGR valve is not in a forcibly opened state than when the EGR valve is in the forcibly opened state. Specifically, the EG-ECU sets the forcible suspension engine speed NEoff in such a manner that an allowance ΔNEallw of the forcible suspension engine speed NEoff with respect to the resumption engine speed NErtn has a smaller value when the EGR valve is not in the forcibly opened state than when the EGR valve is in the forcibly opened state.