EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

Japanese Patent JP2785702

B2

PURPOSE: To aim at an appropriate deterioration recovery treatment by surely detecting unrecoverable temporary and permanent deterioration in a palladium group catalyst.
CONSTITUTION: An exhaust emission control device of an internal combustion device is provided with a catalyst 50 for exhaust emission control carrying mainly palladium, a deterioration degree detection means 51 for detecting deterioration degree of the catalyst 50, an exhaust temperature detection means 52 for detection exhaust temperature flowing in the catalyst 50, a deterioration recovery treatment timing judging means 53 for judging a deterioration recovery treatment timing of the catalyst according to the detected deterioration degree, and a deterioration recovery treating means 54 in which the deterioration of the catalyst is recovered by controlling the air-fuel ratio of exhaust gas to the leaner side than its theoretical air fuel ratio when the detected exhaust temperature is larger than a specified value. It is also provided with a recovery non-treatment judging means 55 for judging whether the recovery of the temporary deterioration is not yet treated or not based on the deterioration degree detected just after the engine is started, and an interrupt means 56 for making the deterioration recover treatment regardless of the deterioration recovery treatment timing, when the judged result shows no recovering treatment.

ISOBE AKIO
OOTA TADAKI
AOYAMA HISASHI
TAYAMA AKIRA

JP21741794A

August 13, 1998

September 12, 1994

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NITSUSAN JIDOSHA KK

F01N3/20; B01D53/94; B01J23/44; F01N3/24; F02D41/14; (IPC1-7): F01N3/20; B01D53/94; B01J23/44; F01N3/20; F02D41/14

JP7238854A
JP7217480A
JP6200811A

Masaki Goto (1 person outside)

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