US4887427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust particle removing system for an engine
Assignee: Nissan Motor Co Ltd
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Filing: 1988-09-02
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Granted: 1989-12-19
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Expires: 2008-09-02
Abstract
Abstract A first filter is disposed in an engine exhaust passage. A second filter is disposed in the engine exhaust passage at a location downstream of the first filter. Thus, the first and second filters are connected in series with one another. The first and second filters are designed so that an amount of exhaust particles trapped by the first filter is greater than an amount of exhaust particles trapped by the second filter. A pressure across the series combination of the filters may be detected. The filters may be rejuvenated when the detected pressure across the series combination of the filters reaches a reference pressure.
Inventors
- 👤 Motohiro Shinzawa
- 👤 Nobukazu Kanesaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:33
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/033; F01N3/035; F01N13/00; F01N13/009; F01N13/011; F01N13/08; F01N13/10; F01N3/023; F01N3/025; F01N9/00; F01N9/002; F01N2510/00; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
An exhaust particle removing system for an engine comprising: (a) first and second filter means disposed separately in an exhaust passage of the engine and connected in series with one another, the first filter residing at a location upstream of the second filter, the first filter being operative to trap an amount of exhaust particles greater than an amount of exhaust particles trapped by the second filter; (b) means for sensing a pressure across the series combination of the first and second filter means; and (c) means for rejuvenating the first and second filter means, when the sensed pressure reaches a reference pressure, (d) said first filter comprising sub-filters respectively disposed in branches of an exhaust manifold of the engine.
Claim 2
Dependent Claim
120 words
An exhaust particle removing system for an engine comprising: (a) first and second filter means disposed separately in an exhaust passage of the engine and connected in series with one another, the first filter residing at a location upstream of the second filter, the first filter being operative to trap an amount of exhaust particles greater than an amount of exhaust particles trapped by the second filter; (b) means for sensing a pressure across the series combination of the first and second filter means; and (c) means for rejuvenating the first and second filter means, when the sensed pressure reaches a reference pressure, (d) said first filter comprising sub-filters respectively disposed in branches of an exhaust manifold of the engine.
Claim 3
Dependent Claim
25 words
The system of claim 1, further comprising connecting means providing a passageway connecting the branches of the exhaust manifold at locations upstream of said sub-filters.
Claim 4
Dependent Claim
26 words
The system of claim 2, wherein said second filter means has a trapping efficiency which is greater than a trapping efficiency of said first filter means.
Claim 5
Dependent Claim
67 words
The system of claim 1 for use with an internal combustion engine having an intake passage means for supplying air to the engine and an exhaust system including said exhaust passage for discharging exhaust gases from the engine to the atmosphere wherein said first filter means traps exhaust particles discharged from the engine and said second filter means traps exhaust particles discharged from the first filter means.
Claim 6
Dependent Claim
74 words
The exhaust particle removing system as claimed in claim 1, wherein the exhaust passage further comprises an exhaust manifold, an exhaust passage and an exhaust pipe, and wherein said first filter means has an upstream end connected to the exhaust manifold and a downstream end connected to the exhaust passage, and wherein said second filter means has an upstream end connected to the exhaust passage and a downstream end connected to the exhaust pipe.
Claim 7
Dependent Claim
107 words
The exhaust particle removing system as claimed in claim 5 wherein said pressure sensing means is sensitive to a pressure differential between the upstream end of the first filter means and the downstream end of the second filter means for providing a sensed pressure differential, temperature sensing means sensitive to the temperature of the exhaust gas discharged from the engine for providing a sensed exhaust gas temperature, and condition responsive means for throttling the air flow to the engine to increase the exhaust gas temperature when the sensed pressure differential exceeds a predetermined value and when the sensed exhaust gas temperature is less than a predetermined value.
Claim 8
Dependent Claim
38 words
The exhaust particle removing system as claimed in claim 5, wherein said exhaust manifold has a plurality of branches, each of said branches having a third catalytic filter means for trapping exhaust particles discharged through the corresponding branch.
Claim 9
Dependent Claim
31 words
The exhaust particle removing system as claimed in claim 7, wherein each of said third filter means comprises a catalyst for burning the exhaust particles trapped in said third filter means.
Claim 10
Dependent Claim
41 words
The exhaust particle removing system as claimed in claim 1, wherein said first filter means comprises a catalyst for burning the exhaust particles trapped therein and wherein said second filter means comprises a catalyst for burning the exhaust particles trapped therein.
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |