[특허]Method and apparatus for improving engine fuel economy

Method and apparatus for improving engine fuel economy 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01N-003/20 F02D-041/14
출원번호	US-0843948 (1997-04-17)
발명자 / 주소	Cullen Michael John Farmer David George Surnilla Gopichandra Cok Susan Nicole
출원인 / 주소	Ford Global Technologies, Inc.
대리인 / 주소	Lippa
인용정보	피인용 횟수 : 103 인용 특허 : 0

초록 ▼

A managed fuel air mode control system is provided which operates in an open loop lean mode of operation whenever open loop enable criteria is met. During the open loop lean mode of operation, a rich A/F purge mode of operation is dictated when a NO.sub.x trap is determined to be full. After purging the trap, engine operation returns to stoichiometric and either enters a closed loop learning operation or returns to lean operation depending upon the time that has passed since the last learning operation. During the learning operation, an adaptive control algorithm learns or updates a long term correction factor that is used during the open loop lean A/F mode of operation. Also during open loop operation, the amount of SO.sub.x accumulated in the trap is calculated and the open loop mode is terminated when the amount of SO.sub.x exceed a threshold.

대표청구항 ▼

[ What is claimed is:] [1.] A method of operating an internal combustion engine with a NO.sub.x trap located in the engine exhaust path comprising a sequence of the following steps:operating the engine in an open loop lean fuel control mode wherein the fuel calculation includes an open loop correction factor;calculating the NO.sub.x accumulated in said trap during said lean fuel control mode;when the accumulated NO.sub.x exceeds a predetermined amount ramping the A/F of the mixture supplied to said engine from a lean A/F to stoichiometric and switching from stoichiometric to a rich A/F for a predetermined purge time and thereafter switching back to stoichiometric;ramping the A/F of the mixture supplied to said engine to said lean A/F from stoichiometric if the time since the last correction of said open loop correction factor is less than a predetermined update interval; andoperating the engine in a closed loop fuel control mode at stoichiometric to update said open loop correction factor if the time since the last correction of said open loop correction factor exceeds said update interval.

이 특허를 인용한 특허 (103)

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Gopichandra Surnilla ; Jeffrey Scott Hepburn ; Jerry D. Robichaux ; Michael John Cullen, Method and system for reducing vehicle tailpipe emissions when operating lean.
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Surnilla, Gopichandra; Farmer, David George, Method and system for transitioning between lean and stoichiometric operation of a lean-burn engine.
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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

Method and apparatus for improving engine fuel economy 원문보기

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연구과제 타임라인

이 특허를 인용한 특허 (103)

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Method and apparatus for improving engine fuel economy 원문보기

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