Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1996-11-06
1998-07-21
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60285, 60297, F01N 320
Patent
active
057820872
ABSTRACT:
An exhaust manifold of an engine is connected to a three way (TW) catalyst, and the TW catalyst is connected to an NH.sub.3 adsorbing and oxidizing (NH.sub.3 -AO) catalyst, such as the Cu-zeolite catalyst. The engine performs the lean and the rich operations alternately and repeatedly. When the engine performs the rich operation, the TW catalyst synthesizes NH.sub.3 from NO.sub.x in the inflowing exhaust gas, and the NH.sub.3 is then adsorbed in the NH.sub.3 -AO catalyst. Next, when the engine performs the lean operation, NO.sub.x passes through the TW catalyst, and the adsorbed NH.sub.3 is desorbed and reduces the inflowing NO.sub.x. When the rich operation is in process, or is to be started, the exhaust gas temperature flowing into the NH.sub.3 -AO catalyst is detected. If the temperature is equal to or higher than the upper threshold representing the rich endurance temperature, the lean or the stoichiometric operation is performed.
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Patent Abstracts of Japan, vol. 008, No. 020 (M-271), Jan. 24, 1984, Abstracts of JP-58-178848 A (Nippon Denso KK), Oct. 19, 1983.
Igarashi Kouhei
Itou Takaaki
Kinugasa Yukio
Suzuki Naoto
Tanaka Toshiaki
Argenbright Tony M.
Toyota Jidosha & Kabushiki Kaisha
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