Exhaust emission control device for internal combustion engine

Details Exhaust emission control device for internal combustion engine Exhaust emission control device for internal combustion engine

2006-02-28

2006-02-28

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S274000, C060S285000, C123S300000, C123S443000

Reexamination Certificate

active

07003945

ABSTRACT:
An exhaust emission control device for internal combustion engine comprising air-fuel ratio modulating means and air-fuel ratio modulation adjusting means. The air-fuel ratio modulation adjusting means adjusts a lean period to be longer or the degree of leaning to be higher, during which the air-fuel ratio of exhaust gas is a lean air-fuel ratio, compared with when an oxygen storage (S10) of a three-way catalyst exceeds a first given value X1if the oxygen storage is not higher than the first given value X1(S16, S18), and adjusts a rich period to be longer or the degree of enriching to be higher, during which the exhaust air-fuel ratio is a rich air-fuel ratio, compared with when a reducing agent storage (S12) exceeds a second given value Y1if the reducing agent storage is not higher than the second given value Y1(S20, S22).

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patent: 6766641 (2004-07-01), Surnilla et al.
patent: 2002-89250 (2002-03-01), None

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