Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1993-12-02
1995-04-18
Yeung, James C.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, 60286, 60301, F01N 320
Patent
active
054067901
ABSTRACT:
A NO.sub.x absorbent which absorbs NO.sub.x in exhaust gas when the air-fuel ratio of the exhaust gas is lean and releases absorbed NO.sub.x when the oxygen concentration of the exhaust gas is lowered, is disposed in an exhaust passage of an engine. When the amount of the NO.sub.x absorbed by the NO.sub.x absorbent is increased, the regenerating process of the NO.sub.x absorbent is performed by supplying a reducing agent to the NO.sub.x absorbent so that the NO.sub.x absorbed by the NO.sub.x absorbent is released and reduced by the reducing agent. Usually, to reduce the amount of the reducing agent required for the regenerating process, the inflowing exhaust gas into the NO.sub.x absorbent is shut off. In the present invention, even in the regenerating process of NO.sub.x absorbent, a small amount of the exhaust gas (carrier gas) is introduced to the NO.sub.x absorbent to carry the supplied reducing agent through the NO.sub.x absorbent to thereby reduce the amount of the reducing agent required for the regenerating process and to shorten the time required to complete the regenerating process.
REFERENCES:
patent: 3716996 (1973-02-01), Maruoka
patent: 3733829 (1973-05-01), Henault
patent: 3739583 (1973-06-01), Tourtellotte
patent: 3810361 (1974-05-01), Weaving
patent: 3813226 (1974-05-01), Heitland
patent: 3814589 (1974-06-01), Heitland
patent: 5207990 (1993-05-01), Sekiya
Araki Yasushi
Hirota Shinya
Kobashi Kiyoshi
Murakami Fumitada
Oda Tomohiro
O'Connor Daniel J.
Toyota Jidosha & Kabushiki Kaisha
Yeung James C.
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