[특허]Dual converter engine exhaust system for reducing hydrocarbon emissions

Dual converter engine exhaust system for reducing hydrocarbon emissions 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01N-003/28
출원번호	US-0535325 (1990-06-08)
발명자 / 주소	Patil Mallanagouda D. (Corning NY) Socha Jr. Louis S. (Painted Post NY) Lachman Irwin M. (Corning NY)
출원인 / 주소	Corning Incorporated (Corning NY 02)
인용정보	피인용 횟수 : 95 인용 특허 : 0

초록 ▼

An engine exhaust system and method of controlling hydrocarbon emissions are provided. The system and method are based on the use of two catalytic converter chambers, a first chamber containing a catalytic material and a second chamber containing catalyst as well as molecular sieves capable of adsorbing hydrocarbons during engine start-up and of having hydrocarbons desorbed therefrom when the catalysts reach an effective converting temperature. According to the invention, engine exhaust is selectively conveyed to each of the two converters in a manner such that initially produced hydrocarbon is withheld in the system by the molecular sieves in order to be recycled through the converters and brought into contact with the catalyst after an effective converting temperature has been attained.

대표청구항 ▼

An exhaust system for the conversion of hydrocarbons in an exhaust stream from an engine comprising: first catalytic converter means for substantially converting hydrocarbons in a hydrocarbon-containing engine exhaust stream to water and carbon dioxide, said first catalytic converter means having a light-off temperature; second catalytic converter means, situated farther from the engine than said first means, comprising (a) molecular sieve means capable of adsorbing hydrocarbons from said engine exhaust stream and further capable of having said hydrocarbons desorbed therefrom upon heating to a desorption temperature, and (b) at least one catalyst for the conversion of hydrocarbons to water and carbon dioxide, said catalyst having a light-off temperature; and one or more conveying means for selectively conveying said engine exhaust stream within said engine exhaust system, whereby said conveying means operate to (i) convey, during a first period of time prior to said first catalytic converter means attaining its light-off temperature, substantially all of said engine exhaust stream through said first catalytic converter means and then through said second catalytic converter means; (ii) convey, during a second period of time subsequent to said first catalytic converter means having attained its light-off temperature and prior to the molecular sieve means having attained its desorption temperature, (a) a portion of the exhaust stream discharged from said first catalytic converter means through said second catalytic converter means, and (b) the remainder of the exhaust from said first means to the atmosphere, bypassing said second means; and (iii) convey, during a third period of time subsequent to said molecular sieve means having attained its desorption temperature, (a) a portion of the exhaust stream from said first catalytic converter means through said second catalytic converter means and then recycle substantially all of the exhaust discharged from said second means back to either said engine or to said first means, and (b) the remainder of the exhaust stream from said first means to the atmosphere, bypassing said second means.

이 특허를 인용한 특허 (95)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Dual converter engine exhaust system for reducing hydrocarbon emissions 원문보기

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Dual converter engine exhaust system for reducing hydrocarbon emissions 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (95)

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