EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

Japanese Patent JP2016211484

A

PROBLEM TO BE SOLVED: To provide an exhaust gas purification device using a NOx catalyst which adsorbs NOx exhausted from an engine right after started, to purify the NOx, where the device can purify the NOx in an appropriate manner to the deteriorating state of the NOx catalyst.SOLUTION: The exhaust gas purification device uses the NOx catalyst having a support formed of zeolite and Pd supported by the support for purifying NOx from exhaust gas. An ECU of the exhaust gas purification device acquires the catalyst temperature of the NOx catalyst (S2), estimates an integrated thermal load under stoichiometric or rich exhaust gas as one of parameters for specifying the deteriorating state of the NOx catalyst (S3), uses the estimated deteriorating state for setting a NOx purge starting temperature and a NOx purge finishing temperature (S4), and starts NOx purge control for the air-fuel ratio of the exhaust gas to be stoichiometric or rich according to the catalyst temperature exceeding a predetermined NOx purge starting temperature and then finishes the NOx purge control according to the catalyst temperature exceeding a predetermined NOx purge finishing temperature.SELECTED DRAWING: Figure 5

JPH06299842	STRUCTURE FOR FITTING EXHAUST PIPE WITH CATALYST SUPPORT ELECTRICALLY HEATABLE
JP5527024	Exhaust purification device
JP2009019559	SULFUR COMPONENT DETECTOR

TSUYAMA TOMOKO
WADA KATSUJI
MURATA YUICHIRO
ONO HIROSHI

JP2015097457A

December 15, 2016

May 12, 2015

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HONDA MOTOR CO LTD

F01N3/20; B01D53/94; B01J29/068; F01N3/08; F01N3/10; F02D41/04

JP2003097324A	2003-04-03
JPH11315713A	1999-11-16

Masayuki Masabayashi
Hayashi Ichiyoshi
Hiroaki Hoshino

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