(19)
(11) EP 2 581 576 A8

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

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
26.06.2013 Bulletin 2013/26

(43) Date of publication:
17.04.2013 Bulletin 2013/16

(21) Application number: 11837288.7

(22) Date of filing: 29.08.2011
(51) International Patent Classification (IPC): 
F01N 3/08(2006.01)
F02D 41/04(2006.01)
F01N 3/36(2006.01)
(86) International application number:
PCT/JP2011/070085
(87) International publication number:
WO 2013/031027 (07.03.2013 Gazette 2013/10)
(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 RS SE SI SK SM TR

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

(72) Inventors:
  • BISAIJI, Yuki
    Aichi-ken, 471-8571 (JP)
  • YOSHIDA, Kohei
    Aichi-ken, 471-8571 (JP)
  • INOUE, Mikio
    Aichi-ken, 471-8571 (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) An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst where NOx which is contained in exhaust gas and modified hydrocarbons react. The exhaust purification catalyst carries precious metal catalysts and is formed with a basic exhaust gas flow surface part. The exhaust purification catalyst has the property of reducing NOx if making the concentration of hydrocarbons which flow into the exhaust purification catalyst vibrate by within a predetermined range of amplitude and within a predetermined range of period. The system estimates the holding ability by which the NOx in the exhaust gas is held on the basic exhaust gas flow surface part of the exhaust purification catalyst and, when the holding ability becomes less than a predetermined judgment value of the holding ability, makes the concentration of hydrocarbons which flow into the exhaust purification catalyst rise.