US5711149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for purifying the exhaust gas of a diesel engine
Assignee: Toyota Motor Corp
•
Filing: 1996-05-15
•
Granted: 1998-01-27
•
Expires: 2016-05-15
Abstract
Abstract A device for purifying the exhaust gas of a diesel engine comprises a filter for collecting particulates which is arranged in the exhaust system of the engine, an oxidation catalyst arranged in the exhaust system upstream of the filter, diesel fuel supply unit for supplying diesel fuel to the oxidation catalyst when the filter must be regenerated, and a heater. The heater heats the diesel fuel supplied from the diesel fuel supply unit to the oxidation catalyst only in the initial step of supplying the diesel fuel when the temperature of the oxidation catalyst is lower than a predetermined temperature and the filter must be regenerated.
Inventors
- 👤 Yasushi Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
F; F01; F01N; F01N9/00; F01N9/002; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9481; B01D53/9495; F01N13/00; F01N13/009; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/025; F01N3/0253; F01N3/08; F01N3/0807; F01N3/0821; F01N3/0828; F01N3/0835; F01N3/0871; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2033; F01N3/24; F01N3/36; F01N2240/00; F01N2240/16; F01N2250/00; F01N2250/12; F01N2250/14; F01N2430/00; F01N2430/06; F01N2560/00; F01N2560/02; F01N2560/026; F01N2610/00; F01N2610/03; F01N2610/10; F01N2610/14; F02; F02B; F02B3/00; F02B3/06; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0055; F02D41/02; F02D41/021; F02D41/0235; F02D41/027; F02D41/029; F02M; F02M26/00; F02M26/13; F02M26/14; F02M26/15; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; and heating means for heating the diesel fuel supplied from said diesel fuel supply means to said oxidation catalyst only in the initial step of supplying the diesel fuel when a temperature of said oxidation catalyst is lower than a predetermined temperature and said filter must be regenerated.
Claim 2
Independent Claim
105 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; and heating means for heating the diesel fuel supplied from said diesel fuel supply means to said oxidation catalyst only in the initial step of supplying the diesel fuel when a temperature of said oxidation catalyst is lower than a predetermined temperature and said filter must be regenerated.
Claim 3
Dependent Claim
24 words
A device according to claim 1, wherein said diesel fuel supply means has a fuel passage connected to the fuel tank of said engine.
Claim 4
Dependent Claim
35 words
A device according to claim 1, wherein said diesel engine has an exhaust gas recirculation system which connects the intake system of the engine with the exhaust system between said oxidation catalyst and said filter.
Claim 5
Independent Claim
97 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; and separation means for separating light molecular weight components from the diesel fuel supplied from said diesel fuel supply means to supply said light molecular weight components to said oxidation catalyst in the initial step of supplying the diesel fuel.
Claim 6
Independent Claim
97 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; and separation means for separating light molecular weight components from the diesel fuel supplied from said diesel fuel supply means to supply said light molecular weight components to said oxidation catalyst in the initial step of supplying the diesel fuel.
Claim 7
Dependent Claim
24 words
A device according to claim 4, wherein said diesel fuel supply means has a fuel passage connected to the fuel tank of said engine.
Claim 8
Dependent Claim
25 words
A device according to claim 4, wherein said separation means is a hydrocarbon absorbent arranged between said diesel fuel supply means and said oxidation catalyst.
Claim 9
Independent Claim
106 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; and changing means for changing the molecular weight of the diesel fuel, supplied from said diesel fuel supply means to said oxidation catalyst at least in the initial step of supplying the diesel fuel to a low molecular weight by use of the heat of the previous filter regeneration.
Claim 10
Independent Claim
106 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; and changing means for changing the molecular weight of the diesel fuel, supplied from said diesel fuel supply means to said oxidation catalyst at least in the initial step of supplying the diesel fuel to a low molecular weight by use of the heat of the previous filter regeneration.
Claim 11
Dependent Claim
24 words
A device according to claim 7, wherein said diesel fuel supply means has a fuel passage connected to the fuel tank of said engine.
Claim 12
Dependent Claim
43 words
A device according to claim 7, wherein said changing means has a heat exchanger arranged around said exhaust system downstream of said filter through which said fuel passage of said diesel fuel supply means is connected to said fuel tank of said engine.
Claim 13
Independent Claim
110 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; intake air decreasing means for decreasing the amount of intake air in the initial step of supplying the diesel fuel; and diesel fuel decreasing means for decreasing the amount of diesel fuel supplied by said diesel fuel supply means when the amount of intake air is decreased by said intake air decreasing means.
Claim 14
Independent Claim
110 words
A device for purifying the exhaust gas of a diesel engine comprising: a filter for collecting particulates, which is arranged in the exhaust system of the engine; an oxidation catalyst arranged in said exhaust system upstream of said filter; diesel fuel supply means for supplying diesel fuel to said oxidation catalyst when said filter must be regenerated; intake air decreasing means for decreasing the amount of intake air in the initial step of supplying the diesel fuel; and diesel fuel decreasing means for decreasing the amount of diesel fuel supplied by said diesel fuel supply means when the amount of intake air is decreased by said intake air decreasing means.
Claim 15
Dependent Claim
24 words
A device according to claim 10, wherein said diesel fuel supply means has a fuel passage connected to the fuel tank of said engine.
Claim 16
Dependent Claim
35 words
A device according to claim 10, wherein said diesel engine has an exhaust gas recirculation system which connects the intake system of the engine with the exhaust system between said oxidation catalyst and said filter.
Claim 17
Dependent Claim
47 words
A device according to claim 10, wherein said diesel engine has an exhaust gas recirculation system, said device further comprises recirculation exhaust gas increasing means for increasing the amount of recirculation exhaust gas when the amount of intake air is decreased by said intake air decreasing means.
Claim 18
Dependent Claim
30 words
A device according to claim 13, wherein said exhaust gas recirculation system connects the intake system of the engine with the exhaust system between said oxidation catalyst and said filter.
References Cited (Backward Citations)
FR1382418A
Cited
US3699683A
Cited
US4294220A
Cited
US4345429A
Cited
US4535588A
Cited
US4372111A
Cited
US4322387A
Cited
US4359863A
Cited
US4449362A
Cited
JPS61122718A
Cited
JPS61181814A
Cited
JPS63198717A
Cited
JPS646311A
Cited
US5067320A
Cited
JPH0396611A
Cited
US5207990A
Cited
DE4238068A1
Cited
US5634331A
Cited
US5544482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-26 | 2001-07-28 | 2002-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-26 | 2005-07-28 | 2006-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-26 | 2009-07-28 | 2010-01-27 | $7700.00 | Window Closed / Lapsed |