EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

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(11)

EP 2 617 959 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:
	18.09.2013 Bulletin 2013/38

(43)	Date of publication:
	24.07.2013 Bulletin 2013/30

(21)	Application number: 10849177.0

(22)	Date of filing: 18.10.2010

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International Patent Classification (IPC):

F01N 3/36^(2006.01)
F02D 41/04^(2006.01)

F01N 3/08^(2006.01)

(86)	International application number:
	PCT/JP2010/068785

(87)	International publication number:
	WO 2012/053117 (26.04.2012 Gazette 2012/17)

(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 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) UMEMOTO, Kazuhiro 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. The concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to vibrate by within 200 ppm or more predetermined amplitude and within a 5 second or more predetermined period. At this time, when a predetermined amount or more of NO_x is stored in the exhaust purification catalyst (13) or can be stored, the concentration of hydrocarbons flowing into the exhaust purification catalyst (13) is temporarily increased to desorb NO_x which is stored at the exhaust purification catalyst (13).