US5671600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing the NOx emission of a supercharged piston-type internal combustion engine
Assignee: FEV Europe GmbH
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Filing: 1995-11-09
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Granted: 1997-09-30
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Expires: 2015-11-09
Abstract
Abstract A method of reducing NO x emissions of a turbo-charged internal combustion engine. The engine has an exhaust conduit guiding an exhaust gas stream, a charge-air intake conduit guiding a charge-air stream and a turbocharger including a turbine disposed in the exhaust conduit and a compressor disposed in the charge-air intake conduit. The method comprises the steps of branching off a partial exhaust gas quantity from the exhaust gas stream upstream of the turbine as viewed in a direction of exhaust gas flow; passing the partial exhaust gas quantity through a particle filter; and introducing the partial exhaust gas quantity into the charge-air stream upstream of the compressor.
Inventors
- 👤 Franz Pischinger
- 👤 Manfred Durnholz
- 👤 Gerhard Lepperhoff
- 👤 Georg Huthwohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:50
CPC Classifications
F; F02; F02B; F02B47/00; F02B47/04; F02B47/08; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/07; F02M26/13; F02M26/14; F02M26/15; F02M26/35; F02B29/00; F02B29/04; F02B29/0406; F02B3/00; F02B3/06; F02M26/22; F02M26/23; F02M26/28; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
A method of reducing NO x emissions of a turbocharged internal combustion engine having an exhaust conduit guiding an exhaust gas stream, a charge-air intake conduit guiding a charge-air stream and a turbocharger including a turbine disposed in the exhaust conduit and a compressor disposed in the charge-air intake conduit; comprising the following steps: (a) after an engine operation close to full load conditions is reached, branching off, by a controlled operation of a valve, a partial exhaust gas quantity from the exhaust gas stream upstream of the turbine as viewed in a direction of exhaust gas flow; (b) passing the partial exhaust gas quantity through a particle filter; (c) introducing the partial exhaust gas quantity into the charge-air stream upstream of the compressor; and (d) heating the particle filter by at least one part of the exhaust gas stream.
Claim 2
Independent Claim
140 words
A method of reducing NO x emissions of a turbocharged internal combustion engine having an exhaust conduit guiding an exhaust gas stream, a charge-air intake conduit guiding a charge-air stream and a turbocharger including a turbine disposed in the exhaust conduit and a compressor disposed in the charge-air intake conduit; comprising the following steps: (a) after an engine operation close to full load conditions is reached, branching off, by a controlled operation of a valve, a partial exhaust gas quantity from the exhaust gas stream upstream of the turbine as viewed in a direction of exhaust gas flow; (b) passing the partial exhaust gas quantity through a particle filter; (c) introducing the partial exhaust gas quantity into the charge-air stream upstream of the compressor; and (d) heating the particle filter by at least one part of the exhaust gas stream.
Claim 3
Dependent Claim
22 words
The method as defined in claim 1, further comprising the step of cooling the partial exhaust gas quantity prior to step (c).
Claim 4
Independent Claim
144 words
A method of reducing NO x emissions of a turbocharged internal combustion engine having an exhaust conduit guiding an exhaust gas stream, a charge-air intake conduit guiding a charge-air stream and a turbocharger including a turbine disposed in the exhaust conduit and a compressor disposed in the charge-air intake conduit; comprising the steps of (a) branching off, by a controlled operation of a valve, a partial exhaust gas quantity from the exhaust gas stream of at least one predetermined engine cylinder upstream of the turbine as viewed in a direction of exhaust gas flow; (b) passing the partial exhaust gas quantity through a particle filter in a zone where step (a) is performed; (c) introducing the partial exhaust gas quantity into the charge-air stream upstream of the compressor; and (d) heating the particle filter by at least one part of the exhaust gas stream.
Claim 5
Independent Claim
144 words
A method of reducing NO x emissions of a turbocharged internal combustion engine having an exhaust conduit guiding an exhaust gas stream, a charge-air intake conduit guiding a charge-air stream and a turbocharger including a turbine disposed in the exhaust conduit and a compressor disposed in the charge-air intake conduit; comprising the steps of (a) branching off, by a controlled operation of a valve, a partial exhaust gas quantity from the exhaust gas stream of at least one predetermined engine cylinder upstream of the turbine as viewed in a direction of exhaust gas flow; (b) passing the partial exhaust gas quantity through a particle filter in a zone where step (a) is performed; (c) introducing the partial exhaust gas quantity into the charge-air stream upstream of the compressor; and (d) heating the particle filter by at least one part of the exhaust gas stream.
Claim 6
Dependent Claim
35 words
The method as defined in claim 3, further comprising the step of operating said at least one predetermined engine cylinder in a partial load condition at a higher engine load than the other engine cylinders.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-29 | 2001-03-31 | 2001-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-29 | 2005-03-31 | 2005-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-29 | 2009-03-31 | 2009-09-30 | $7700.00 | Window Closed / Lapsed |