EP0114696A2
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EP
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A method and a device for exhaust emission control for diesel engines
Assignee: Hitachi Ltd
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Filing: 1984-01-23
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Granted: —
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Expires: 2004-01-23
Abstract
Abstract A method and a device for exhaust emission control for diesel engines including a trap (12) in the form of a filter formed of heat-resting material for catching carbon particulates. The trap has no directional effect with respect to air permeability, and combustion gas for heating the trap or a fuel for activating a catalyst provided to the trap is supplied to the trap from a direction which is substantially perpendicular to a direction in which an exhaust gas flows from the engine to the trap. Thus, then obturation of the trap occurs as a result of accumulation of the trapped carbon particles, such particulate material can be readily removed by oxidation treatment, to thereby enable regeneration of the trap to be effected with a high degree of efficiency-
Inventors
- 👤 Toshifumi Usui
- 👤 Syozo Yanagisawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 20:49
CPC Classifications
F; F01; F01N; F01N9/00; F01N9/002; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/025; F01N3/0253; F01N3/0256; F01N3/033; F01N3/035; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2882; F01N2250/00; F01N2250/02; F01N2390/00; F01N2390/02; F01N2900/00; F01N2900/04; F01N2900/0422; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y10; Y10S; Y10S55/00; Y10S55/10; Y10S55/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
228 words
A method for exhaust emission control for a diesel engine, characterized by the following steps: catching carbon particles in a path of exhaust gas by a trap having no directional effect with respect to air permeability; introducing air and directing it against said trap in a direction substantially perpendicular to thedirection in which the exhaust gas flows from the engine to the trap; subjecting said trap to oxidation treatment so as to oxidize particulates of carbon caught by the trap to achieve regeneration of the trap by controlled supply of fuel to a fuel injection nozzle opening in a path of flow of the introduced air, controlling the conditions under which said trap is subjected to oxidation treatment so that an allowable exhaust pressure of the engine is determined with respect to a rotational speed of the engine and a load applied to the engine, and controlling combustion carried out by the oxidation of the carbon particulatesin such a manner that when an exhaust pressure of the engine that is sensed exceeds the afore-mentioned allowable exhaust pressure an amount of heat and a heating time necessary for performing the oxidation are determined based on an actual value of temperature of the trap that is measured and the amount of heat thus determined is supplied for the trap for a period of the heating time that has been determined.
Claim 2
Independent Claim
228 words
A method for exhaust emission control for a diesel engine, characterized by the following steps: catching carbon particles in a path of exhaust gas by a trap having no directional effect with respect to air permeability; introducing air and directing it against said trap in a direction substantially perpendicular to thedirection in which the exhaust gas flows from the engine to the trap; subjecting said trap to oxidation treatment so as to oxidize particulates of carbon caught by the trap to achieve regeneration of the trap by controlled supply of fuel to a fuel injection nozzle opening in a path of flow of the introduced air, controlling the conditions under which said trap is subjected to oxidation treatment so that an allowable exhaust pressure of the engine is determined with respect to a rotational speed of the engine and a load applied to the engine, and controlling combustion carried out by the oxidation of the carbon particulatesin such a manner that when an exhaust pressure of the engine that is sensed exceeds the afore-mentioned allowable exhaust pressure an amount of heat and a heating time necessary for performing the oxidation are determined based on an actual value of temperature of the trap that is measured and the amount of heat thus determined is supplied for the trap for a period of the heating time that has been determined.
Claim 3
Dependent Claim
116 words
An exhaust emission control device for a diesel engine comprising: a trap (12) having no directional effect with respect to air permeability; means (21, 15) for introducing air and directing same against said trap in a direction substantially perpendicular to a direction in which an exhaust gas flows from the engine to the trap; and a fuel injection nozzle (16) opening in a path of flow of the air introducedby said air introducing means; wherein a fuel is supplied to said fuel injection nozzle (16) to control the conditions under which said trap (12) is subjected to oxidation treatment so as to oxidize particulates of carbon caught by the trap to achieve regeneration of the trap.
Claim 4
Dependent Claim
116 words
An exhaust emission control device for a diesel engine comprising: a trap (12) having no directional effect with respect to air permeability; means (21, 15) for introducing air and directing same against said trap in a direction substantially perpendicular to a direction in which an exhaust gas flows from the engine to the trap; and a fuel injection nozzle (16) opening in a path of flow of the air introducedby said air introducing means; wherein a fuel is supplied to said fuel injection nozzle (16) to control the conditions under which said trap (12) is subjected to oxidation treatment so as to oxidize particulates of carbon caught by the trap to achieve regeneration of the trap.
Claim 5
Dependent Claim
32 words
An exhaust emission control device as claimed in claim 2, wherein said trap is in the form of a trap with a three-dimensional, net-like structure having a coat of catalyst applied thereto.
Claim 6
Dependent Claim
37 words
An exhaust emission control device as claimed in claim 2 or 3, further comprising fuel injection means (20) provided to said fuel injection nozzle (16), to thereby enable the fuel injection nozzle to function as a burner.
Claim 7
Dependent Claim
148 words
An exhaust emission control device as claimed in claim4, further comprising a control unit (23) for effecting control of a volume of heat generated by said burner, said control unit having the function of setting an allowable exhaust pressure for determining an exhaust pressure of the engine which is allowable with respect to a rotational speed of the. engine and a load applied to the engine, and the function of controlling combustion carried out by the burner in such a manner that, when an exhaust pressure of the engine that is sensed exceeds the aforesaid allowable exhaust pressure, an amount of heat and a heating time necessary for performing the oxidation are determined based on an actual value of temperature of the trap that is measured and the amount of heat thus determined is supplied to the trap for a.period of the heating time that has been determined.
Claim 8
Dependent Claim
85 words
An exhaust emission control device as claimed in claim 4, wherein said burner is constructed in a manner to enable the combustion carried out thereby to be turned on and off by a control signal supplied from outside, and said control unit is operative to effect control of the combustion carried out by the burner by using as the control signal supplied to the burner a pulse signal having an on-off ratio which is commensurate with the amount of heat necessary for achieving the oxidation.
References Cited (Backward Citations)
No citation records indexed.
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