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:
May. 03, 2011
Filed:
Dec. 11, 2006
Ryoji Nishiumi, Toyota, JP;
Takeshi Hashizume, Mishima, JP;
Ryoji Nishiumi, Toyota, JP;
Takeshi Hashizume, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
An object of the present invention is to provide a technology that enables to enhance the effect of decreasing the NOx emission achieved by an exhaust gas purification system as a whole while favorably achieving both reduction in the amount of NOx generated in an internal combustion engine by means of EGR and reduction reaction of NOx in an NOx catalyst even when a reduction process for the NOx catalyst is performed while EGR is being performed. In the invention, in the case where addition of fuel into an exhaust pipe from a fuel addition valveis performed to carry out the reduction process for the NOx catalystwhen EGR is being performed mainly by means of a low pressure EGR passage, the amount of the exhaust gas passing through the NOx catalystis decreased by decreasing the amount of the exhaust gas recirculated by the low pressure EGR passage