(19)
(11) EP 2 570 626 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 2 (W2 A1)

(48) Corrigendum issued on:
12.02.2014 Bulletin 2014/07

(88) Date of publication A3:
20.03.2013 Bulletin 2013/12

(43) Date of publication:
20.03.2013 Bulletin 2013/12

(21) Application number: 10851411.8

(22) Date of filing: 14.05.2010
(51) International Patent Classification (IPC): 
F01N 3/08(2006.01)
 B01D 53/94(2006.01)
(86) International application number:
PCT/JP2010/058193
(87) International publication number:
WO 2011/142028 (17.11.2011 Gazette 2011/46)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

(71) Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Toyota-shi, Aichi-ken, 471-8571 (JP)

(72) Inventors:
  • FUKUDA, Koichiro
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • HIROTA, Shinya
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • TOSHIOKA, Shunsuke
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • HOSHI, Sakutaro
    Kariya-shi, Aichi-ken, 448-8671 (JP)

(74) Representative: Kuhnen & Wacker 
Patent- und Rechtsanwaltsbüro Prinz-Ludwig-Straße 40A
85354 Freising
85354 Freising (DE)

   


(54) EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE


(57) This invention is intended to provide a technique which, in an exhaust gas purification apparatus of an internal combustion engine, can avoid a decrease in a NOx purification rate by adding a reducing agent as continuously as possible, while avoiding NH3 from passing through a selective reduction type NOx catalyst to a downstream side thereof. In this invention, the selective reduction type NOx catalyst has an active spot which purifies NOx by the use of NH3, and an adsorption site which adsorbs NH3, wherein a vicinity site, which is located in the vicinity of the active spot, and a distant site, which is located distant from the active spot, exist in the adsorption site. The vicinity site tends to deliver NH3 to the active spot more easily than the distant site does, and the desorption rate of NH3 in the vicinity site is faster than the desorption rate of NH3 in the distant site, and the addition of the reducing agent from the reducing agent addition part is controlled based on the desorption rate of NH3 in the vicinity site so as to continue to cause the NH3 adsorbed to the vicinity site to exist.