Exhaust emission control device of internal-combustion engine

Details Exhaust emission control device of internal-combustion engine Exhaust emission control device of internal-combustion engine

Filed on

2005-07-26

Date issued

2005-07-26

Examiner

Tran, Binh Q. (Department: 3748)

Patent Class

Power plants

SubClass

Internal combustion engine with treatment or handling of...

SubSubClass

By means producing a chemical reaction of a component of the...

Other Related Categories

C060S274000, C060S276000, C060S297000

Type

Reexamination Certificate

Status

active

Patent number

06920752

Description

ABSTRACT:
An exhaust emission control device of an internal-combustion engine comprises a three-way catalytic converter provided in an exhaust passage of the internal-combustion engine, and an air-fuel ratio varying element for forcedly varying an air-fuel ratio of exhaust flowing into the three-way catalytic converter, between a rich air-fuel ratio and a lean air-fuel ratio. A variation characteristic altering element for altering a characteristic of the air-fuel ratio variation is provided, and the three-way catalytic converter has a HC selective oxidizing component for selectively oxidizing HC rather than CO, and a CO storage component for storing CO in a reducing atmosphere. The variation characteristic altering element alters a characteristic of the air-fuel variation (such as an A/F variation period) depending on an stored CO quantity correlative value (such as a quantity of flowing-in CO) which correlates with a quantity of CO stored by the CO storage component (S12).

REFERENCES:
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patent: 5577382 (1996-11-01), Kihara et al.
patent: 6192675 (2001-02-01), Hirota et al.
patent: 6490859 (2002-12-01), Kakuyama et al.
patent: 6499294 (2002-12-01), Katoh et al.
patent: 6672051 (2004-01-01), Tamura et al.
patent: 2002-89250 (2002-03-01), None

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