内燃機関の排ガス浄化装置

Japanese Patent JP4186259

B2

PROBLEM TO BE SOLVED: To accurately detect the deterioration of a lean NOx catalyst by providing an estimation means which estimates the NOx storing capacity of the lean NOx catalyst based on the size of the output value of an oxygen concentration sensor in rich combustion and a deterioration detecting means which detects the deterioration of the catalyst based on the NOx storing capacity of the estimated lean NOx catalyst. SOLUTION: NOx catalyst 14 is arranged in an engine exhaust pipe 12, an A/F sensor 26 is arranged in its upstream, and an O2 sensor 27 is arranged in the downstream. A CPU 31 in an ECU 30 implements lean combustion in an air fuel ratio lean region, NOx in the exhaust gas exhausted in the lean combustion is stored by NOx catalyst 14, the air fuel ratio is temporarily controlled to become rich, and the stored NOx is emitted from the NOx catalyst 14. The CPU 31 finds the peak value of the output of the O2 sensor 27 in the rich combustion, and estimates the NOx storage capacity of the NOx catalyst 14 based on the peak value. The deterioration of the catalyst 14 is thus detected based on the estimated NOx storage capacity.

JP4042476	Exhaust gas purification device for internal combustion engine
JPS5831442	[Title of the Invention] Nainen Kikan Nohi Kikei Noon Dokan Shisouchi
WO/2020/074283	OPTIMIZED RECUPERATION STRATEGY FOR A HYBRID VEHICLE WITH ELECTRICALLY HEATABLE CATALYTIC CONVERTER

Yukihiro Yamashita

JP20357498A

November 26, 2008

July 17, 1998

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株式会社デンソー

F01N9/00; F02D45/00; F01N3/08; F01N3/20; F01N3/24; F01N3/28; F02D41/04

JP8014030A
JP9041948A
JP7238852A

Hironobu Onda

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