US5592925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation device for internal combustion engine
Assignee: NGK Insulators Ltd
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Filing: 1995-09-06
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Granted: 1997-01-14
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Expires: 2015-09-06
Abstract
Abstract An exhaust gas recirculation device for an internal combustion engine has a filter for trapping particulates in a recirculation gas, which is arranged in a recirculation gas route, and a device for generating a reverse air flow in which a pure gas flow for the reverse air flow passing through said filter in a reverse direction with respect to a recirculation gas flowing direction in the filter is generated. In the exhaust gas circulation device, the trapped gases are discharged out of the filter by the reverse air flow and are not returned into the internal combustion engine due to an engine exhaust pressure.
Inventors
- 👤 Minoru Machida
- 👤 Toshio Yamada
- 👤 Yukihito Ichikawa
- 👤 Yoshiyuki Kasai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:42
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/0233; F02; F02M; F02M26/00; F02M26/13; F02M26/35; F02M26/36; F02M26/38; F02M26/39; F02M26/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
106 words
An exhaust gas recirculation device for an internal combustion engine comprising a filter for trapping particulates in a recirculation gas, which is arranged in a recirculation gas route, and a device for generating a reverse air flow in which a pure gas flow for said reverse air flow passing through said filter in a reverse direction with respect to a recirculation gas flowing direction in said filter is generated, wherein a filter regeneration is performed in such a manner that the trapped particulates are discharged out of said filter by said reverse air flow and the trapped particulates are not returned to said internal combustion engine.
Claim 2
Dependent Claim
106 words
An exhaust gas recirculation device for an internal combustion engine comprising a filter for trapping particulates in a recirculation gas, which is arranged in a recirculation gas route, and a device for generating a reverse air flow in which a pure gas flow for said reverse air flow passing through said filter in a reverse direction with respect to a recirculation gas flowing direction in said filter is generated, wherein a filter regeneration is performed in such a manner that the trapped particulates are discharged out of said filter by said reverse air flow and the trapped particulates are not returned to said internal combustion engine.
Claim 3
Dependent Claim
30 words
The exhaust gas recirculation device according to claim 1, wherein an exhaust valve is arranged in a route of said recirculation gas flow at a downstream position of said filter.
Claim 4
Dependent Claim
28 words
The exhaust gas recirculation device according to claim 2, wherein said exhaust valve is served as a recirculation gas valve for adjusting an amount of the recirculation gas.
Claim 5
Dependent Claim
55 words
The exhaust gas recirculation device according to claim 2, wherein a bypass route having an exhaust valve is arranged between an upstream position and a downstream position of said filter, and the recirculation gas is flowed through said bypass route by opening said exhaust valve during a filter regeneration operation using said reverse air flow.
Claim 6
Dependent Claim
46 words
The exhaust gas recirculation device according to claim 2, wherein at least two filters are arranged parallelly in said recirculation gas route and said device for generating the reverse air flow is arranged respectively to said filters, so as to perform a filter regeneration operation alternately.
Claim 7
Dependent Claim
28 words
The exhaust gas recirculation device according to claim 1, wherein a particulate re-trapping portion is arranged in said recirculation gas route at an upstream position of said filter.
Claim 8
Dependent Claim
21 words
The exhaust gas recirculation device according to claim 6, wherein a particulate firing means is arranged in said particulate re-trapping portion.
Claim 9
Dependent Claim
66 words
The exhaust gas recirculation device according to claim 1, wherein said filter has a honeycomb structure having a plurality of cells defined by partition walls having a filtering performance, in which one end of one cell is sealed and the other end of said cell is opened while one end of the adjacent cell is opened and the other end of said adjacent cell is closed.
Claim 10
Dependent Claim
51 words
The exhaust gas recirculation device according to claim 1, wherein said filter has a structure such that a plurality of plate-like filter elements each having a plurality of through-holes passing therethrough from one end surface to the other end surface are stacked via spacers so as to form a space therebetween.
Claim 11
Dependent Claim
27 words
The exhaust gas recirculation device according to claim 1, wherein said filter is formed by porous ceramics, porous metals, ceramics filters or three-dimensional net structure metal fibers.
Claim 12
Dependent Claim
32 words
The exhaust gas recirculation device according to claim 1, wherein a pressure loss of said filter is less than 10 kPa under a condition such that a maximum recirculation gas is flowed.
Claim 13
Dependent Claim
23 words
The exhaust gas recirculation device according to claim 1, wherein a particulate trapping efficiency of said filter is in a range of 30%-90%.
Claim 14
Dependent Claim
41 words
The exhaust gas recirculation device according to claim 1, wherein an amount of said pure gas flow used as said reverse air flow is less than 20 liters per one reverse air flow under a room temperature and a normal pressure.
Claim 15
Dependent Claim
40 words
The exhaust gas recirculation device according to claim 1, wherein an amount of said pure gas flow used as said reverse air flow per one filter is less than a volume 2 times as large as that of said filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-01-14 | 2000-07-15 | 2001-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-14 | 2004-07-15 | 2005-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-14 | 2008-07-15 | 2009-01-14 | $7700.00 | Window Closed / Lapsed |