[특허]Passive secondary air delivery system for two bed catalyst system

Woodward, Inc.

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특허 상세정보

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Passive secondary air delivery system for two bed catalyst system

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01N-003/30
미국특허분류(USC)	060/280; 060/307
출원번호	US-0166119 (2008-07-01)
등록번호	US-8661786 (2014-03-04)
발명자 / 주소	Hemsley, Geoffrey V.
출원인 / 주소	Woodward, Inc.
대리인 / 주소	Reinhart Boerner Van Deuren P.C.
인용정보	피인용 횟수 : 2 인용 특허 : 10

초록
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A passive secondary air delivery system for a two bed catalyst is provided. The system delivers passive secondary air to the second catalyst bed to facilitate oxidation of CO and remaining unburned HC. In a turbocharged engine, the secondary air may be provided from the compressor side of the turbocharger. Control of the amount of air bled from the turbocharger is provided by an orifice in the pipe connecting the turbocharger to the catalyst bed. No active controls are required. In non-turbocharged engines, passive secondary air may be provided by a vent...

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1. A passive secondary air delivery system for a turbocharged engine, comprising: a single exhaust gas treatment facility comprising a two bed catalyst having a first catalyst bed and a second catalyst bed positioned in an exhaust of the engine to reduce NOx and CO contained therein;a turbocharger comprising a compressor having an outlet;a passive secondary air introduction pipe having an inlet, the inlet positioned to receive passive secondary air from the outlet of the compressor, the passive secondary air introduction pipe having an outlet positioned at a location between the first catalyst bed and the second catalyst bed to introduce passive secondary air therebetween; anda fixed restriction for introducing the passive secondary air intermediate of the introduction pipe inlet and the introduction pipe outlet. 2. The passive secondary air delivery system of claim 1, wherein the two bed catalyst is housed in a single housing, and wherein the passive secondary air introduction pipe inlet is coupled downstream of the turbocharger compressor outlet and the passive secondary air pipe outlet is coupled to the single housing such that the passive secondary air pipe outlet fluidly communicates compressed air from the turbocharger between the first catalyst bed and the second catalyst bed. 3. The passive secondary air delivery system of claim 2, wherein the fixed restriction includes an orifice positioned in series with the passive secondary air introduction pipe, the orifice being sized to ensure sufficient air delivery over a whole engine speed/load range to assure oxidation of CO in the second catalyst bed. 4. The passive secondary air delivery system of claim 2, wherein no additional air pump is required to generate the passive secondary air. 5. The passive secondary air delivery system of claim 1, wherein the first catalyst bed is housed in a first housing positioned in the exhaust of the engine to reduce NOx, and wherein the second catalyst bed is housed in a second housing positioned in the exhaust of the engine downstream of the first housing to reduce CO contained in the exhaust, wherein the fixed restriction is provided by a venturi mixer interposed between the first housing and the second housing; andwherein the passive secondary air introduction pipe outlet is coupled to the venturi mixer to draw in passive secondary air for mixing therein with exhaust gases received from the first catalyst bed. 6. The passive secondary air delivery system of claim 5, wherein the porting of the venturi mixer is sized to ensure sufficient air delivery over a whole engine speed/load range to assure oxidation of CO in the second catalyst bed. 7. A passive secondary air delivery system for an engine exhaust system, comprising: a single exhaust gas treatment facility comprising a two bed catalyst having a first catalyst bed and a second catalyst bed positioned in the exhaust of the engine to reduce NOx and CO contained therein;a turbocharger comprising a compressor having an outlet;a passive secondary air pipe having an inlet, the inlet positioned to receive passive secondary air from the outlet of the compressor, the passive secondary air pipe having an outlet positioned at a location between the first catalyst bed and the second catalyst bed to introduce passive secondary air therebetween, the passive secondary air not being generated via a dedicated air pump; anda fixed restriction intermediate of the pipe inlet and the pipe outlet for introducing the passive secondary air. 8. The passive secondary air delivery system of claim 7, wherein the two bed catalyst is housed in a single housing, and wherein the passive secondary air pipe inlet is coupled downstream of the turbocharger and the passive secondary air pipe outlet is coupled to the single housing such that the passive secondary air outlet fluidly communicates compressed air from the turbocharger between the first catalyst bed and the second catalyst bed. 9. The passive secondary air delivery system of claim 8, wherein the fixed restriction includes an orifice positioned in series with the passive secondary air introduction pipe, the orifice being sized to ensure sufficient air delivery over a whole engine speed/load range to assure oxidation of CO in the second catalyst bed. 10. The passive secondary air delivery system of claim 7, wherein the first catalyst bed is housed in a first housing positioned in the exhaust of the engine to reduce NOx, wherein the second catalyst bed is housed in a second housing positioned in the exhaust of the engine downstream of the first housing to reduce CO contained in the exhaust, wherein the fixed restriction is provided by a venturi mixer that is interposed between the first housing and the second housing, and wherein the passive secondary air pipe outlet is coupled to the venturi mixer to draw in passive secondary air for mixing therein with exhaust gases received from the first catalyst bed. 11. The passive secondary air delivery system of claim 10, wherein the porting of the venturi mixer is sized to ensure sufficient air delivery over a whole engine speed/load range to assure oxidation of CO in the second catalyst bed. 12. A low emission engine system, comprising: a single exhaust gas treatment facility comprising a two-bed catalyst in fluid communication with an exhaust port of the engine to receive combusted air/fuel mix, the two-bed catalyst having a passive secondary air inlet positioned between a first catalyst bed and a second catalyst bed to supply passive secondary air to the second catalyst bed to assist oxidation in the second catalyst bed of CO contained in the combusted air/fuel mix;a turbocharger comprising a compressor having an outlet;a passive secondary air introduction pipe having an inlet and an outlet, the inlet of the passive secondary air introduction pipe positioned to receive passive secondary air from the outlet of the compressor, the outlet of the passive secondary air introduction pipe coupled to the passive secondary air inlet of the two-bed catalyst; anda fixed restriction intermediate of the inlet and the outlet of the passive secondary air introduction pipe for introducing the passive secondary air. 13. The engine system of claim 12, further comprising: a single housing for the two-bed catalyst, the single housing accommodating the passive secondary air inlet therethrough. 14. The engine system of claim 13, wherein the fixed restriction includes an orifice interposed between the turbocharger and the secondary air inlet, the orifice being sized to ensure sufficient air delivery over a whole engine speed/load range to assure oxidation of CO in the second catalyst bed. 15. The engine system of claim 13, wherein no additional air pump is required to generate the passive secondary air. 16. The engine system of claim 12, further comprising: a first housing configured to house the first catalyst bed of the two-bed catalyst, the first housing being positioned to reduce NOx in the combusted air/fuel mix;a second housing configured to house the second catalyst bed of the two-bed catalyst, the second housing being positioned downstream of the first housing to reduce CO contained in the combusted air/fuel mix;wherein the fixed restriction is provided by a venturi mixer interposed between the first housing and the second housing, the venturi mixer accommodating the passive secondary air inlet therethrough; andwherein the passive secondary air introduction pipe is coupled to the passive secondary air inlet to allow the venturi mixer to draw in passive secondary air for mixing therein with exhaust gases received from the first catalyst bed.

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이 특허를 인용한 특허 피인용횟수: 2

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Passive secondary air delivery system for two bed catalyst system

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Passive secondary air delivery system for two bed catalyst system

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