EXHAUST GAS PURIFIER FOR INTERNAL COMBUSTION ENGINE

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(11)

EP 2 581 575 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:
	28.08.2013 Bulletin 2013/35

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

(21)	Application number: 11826140.3

(22)	Date of filing: 25.08.2011

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International Patent Classification (IPC):

F01N 3/08^(2006.01)
F02D 41/04^(2006.01)

F01N 3/36^(2006.01)

(86)	International application number:
	PCT/JP2011/069859

(87)	International publication number:
	WO 2013/027300 (28.02.2013 Gazette 2013/09)

(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)	Inventor:
	BISAIJI, Yuki Toyota-shi, Aichi-ken, 471-8571 (JP)

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

(54)	EXHAUST GAS PURIFIER FOR INTERNAL COMBUSTION ENGINE

(57) In an internal combustion engine, an upstream side air-fuel ratio sensor (23), hydrocarbon feed valve (15), exhaust purification catalyst (13), and the downstream side air-fuel ratio sensor (24) are arranged in an engine exhaust passage in that order from the upstream side. If hydrocarbons are fed from the hydrocarbon feed valve (15), the air-fuel ratio which is detected by the downstream side air-fuel ratio sensor (24) changes to the rich side from the reference air-fuel ratio which is detected when hydrocarbons are not fed from the hydrocarbon feed valve (15). The amount of hydrocarbons which are fed from the hydrocarbon feed valve (15) and which slip through the exhaust purification catalyst (13) is detected from the air-fuel ratio difference between the air-fuel ratio detected by the upstream side air-fuel ratio sensor (23) and the reference air-fuel ratio detected by the downstream side air-fuel ratio sensor (24).