EP0488386A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Exhaust gas purifier for diesel engine
Assignee: Mitsubishi Motors Corp
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Filing: 1991-11-29
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Granted: —
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Expires: 2011-11-29
Abstract
Abstract An exhaust gas purifier for a diesel engine is positioned in the middle of an inlet system (3) for supplying air to a combustion chamber (2). The exhaust gas purifier comprises an HC (hydrocarbon) supply means (6), and a catalytic converter (18), which is activated by the hydrocarbon as a reduction agent to crack NOx (oxides of nitrogen) in the exhaust gas, thereby purifying the exhaust gas.
Inventors
- 👤 Kiyoshi Miyajima
- 👤 Hiroshi Oikawa
- 👤 Yoichiro Kono
- 👤 Yasuaki Kumagai
- 👤 Shinji Nakayama
- 👤 Hiroshi C/O Nagasaki Res. & Dev. Center Nagakawa
- 👤 Masayoshi Nagasaki Res. & Dev. Center Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:49
CPC Classifications
F; F02; F02B; F02B49/00; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N2330/00; F01N2330/08; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
An exhaust gas purifier for a diesel engine, comprising: (a) a main fuel injection nozzle (20) for supplying a main fuel to a combustion chamber of the diesel engine; (b) HC supply means (6) for supplying HC (hydrocarbon), said HC supply means (6) being located in the middle of an inlet system (3) for supplying air to the combustion chamber; and (c) a catalytic converter (18) located in the middle of an exhaust gas passage (17) for guiding exhaust gas from said combustion chamber, said catalytic converter (18) being activated by hydrocarbon as a reduction agent to crack NOx (oxides of nitrogen).
Claim 2
Dependent Claim
67 words
An exhaust gas purifier according to claim 1, further including an inlet valve (4) for enabling and disabling communication between said combustion chamber and an inlet port (5) , and an exhaust valve (15) for enabling and disabling communication between said combustion chamber and an exhaust port (16), and wherein said HC supply means (6) is a fuel injector for injecting HC to said inlet port (5).
Claim 3
Dependent Claim
34 words
An exhaust gas purifier according to claim 1, wherein when said inlet valve (4) remains open, said HC supply means (6) is operated to inject HC into said combustion chamber during the inlet stroke.
Claim 4
Dependent Claim
67 words
An exhaust gas purifier according to claim 3, wherein the amount of the fuel from said main fuel injection nozzle (20) is determined so that a total of a calorific energy of HC from said HC supply means (6) and a calorific energy of the main fuel is equivalent to a calorific energy of the main fuel of a diesel engine without said HC supply means (6).
Claim 5
Dependent Claim
57 words
An exhaust gas purifier according to claim 1, wherein supply of HC is started prior to closure of said exhaust valve(15), and part of HC is introduced to the exhaust gas passage (17) from said HC supply means (6) during an overlapping period in which both said inlet valve (4) and said exhaust (15) valve remain open.
Claim 6
Dependent Claim
31 words
An exhaust gas purifier according to claim 1, wherein said HC supply means (6) is operated when the diesel engine is working in a range where much NOx is being formed.
Claim 7
Dependent Claim
29 words
An exhaust gas purifier according to claim 6, wherein data concering the range where much NOx is formed are stored based on an engine load and an engine speed.
Claim 8
Dependent Claim
30 words
An exhaust gas purifier according to claim 1, wherein said HC supply means (6) is operated when the exhaust gas temperature exceeds a temperature for activating said catalytic converter (18).
Claim 9
Dependent Claim
20 words
An exhaust gas purifier according to claim 1, wherein a gas oil for the diesel engine is used as HC.
Claim 10
Dependent Claim
54 words
An exhaust gas purifier according to claim 9, further including a fuel injection pump (21) connected to said main fuel injection nozzle (20) via a fuel pipe, said fuel injection pump (21) delivering a pressurized fuel to said fuel injection nozzle (20) and bypassing part of the fuel to said HC supply means (6).
Claim 11
Dependent Claim
89 words
An exhaust gas purifier according to claim 10, wherein the diesel engine includes a plurality of combustion chambers (2) which are operated in timed relationship with one another so that when some combustion chambers (2) is in the inlet stroke, another combustion chambers (2) is beginning the explosion stroke and so that the fuel supplied to said main fuel injection nozzles (20) associated with said combustion chamber in the explosion stroke is bypassed to said HC supply means (6) associated with said combustion chamber (2) in the inlet stroke.
Claim 12
Dependent Claim
17 words
An exhaust gas purifier according to claim 1, wherein said catalytic converter (18) is a zeolitic catalyst.
Claim 13
Dependent Claim
18 words
An exhaust gas purifier according to claim 12, wherein said zeolitic catalyst is a coppery zeolite catalyst (Cu/ZSM-5).
Claim 14
Dependent Claim
18 words
An exhaust gas purifier according to claim 12, wherein said zeolitic catalyst is a hydrogeneous zeolite catalyst (H/ZSM-5).
Claim 15
Dependent Claim
15 words
An exhaust gas purifier according to claim 1, wherein gasoline is used as hydrocarbon HC.
References Cited (Backward Citations)
WO1983000057A1
Cited
US4524730A
Cited
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