(19)
(11) EP 2 610 450 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:
16.10.2013 Bulletin 2013/42

(43) Date of publication:
03.07.2013 Bulletin 2013/27

(21) Application number: 10848131.8

(22) Date of filing: 02.09.2010
(51) International Patent Classification (IPC): 
F01N 3/08(2006.01)
 F01N 3/36(2006.01)
(86) International application number:
PCT/JP2010/065449
(87) International publication number:
WO 2012/029189 (08.03.2012 Gazette 2012/10)
(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 SE SI SK SM TR

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

(72) Inventors:
  • UMEMOTO, Kazuhiro
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • YOSHIDA, Kohei
    Toyota-shi, Aichi-ken, 471-8571 (JP)
  • INOUE, Mikio
    Toyota-shi, 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 DEVICE FOR INTERNAL COMBUSTION ENGINE


(57) In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. On the exhaust purification catalyst (13), platinum Pt (51) is carried and a basic layer (53) is formed. At the time of engine operation, a main concentration changing action in which the concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to change by a predetermined amplitude (ΔHA) and predetermined period (ΔTA) is performed. Furthermore, before each main concentration changing action, an auxiliary concentration changing action in which the concentration of hydrocarbons is made to change by an amplitude (ΔHB) smaller than the amplitude (ΔHA) at the time of each main concentration changing action is performed.