GB2601903A - Exhaust-gas burner for a motor vehicle, and motor vehicle having an exhaust-gas burner of said type - Google Patents

Exhaust-gas burner for a motor vehicle, and motor vehicle having an exhaust-gas burner of said type Download PDF

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Publication number
GB2601903A
GB2601903A GB2115793.8A GB202115793A GB2601903A GB 2601903 A GB2601903 A GB 2601903A GB 202115793 A GB202115793 A GB 202115793A GB 2601903 A GB2601903 A GB 2601903A
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GB
United Kingdom
Prior art keywords
exhaust
gas burner
combustion chamber
motor vehicle
approximately
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB2115793.8A
Other versions
GB2601903B (en
GB202115793D0 (en
Inventor
Hemminger Sebastian
Fischer Rico
Engin Lukas
Munier Jerome
Berton Andrea
Sofan Uli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of GB202115793D0 publication Critical patent/GB202115793D0/en
Publication of GB2601903A publication Critical patent/GB2601903A/en
Application granted granted Critical
Publication of GB2601903B publication Critical patent/GB2601903B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/14—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a fuel burner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An exhaust gas burner 1 for a motor vehicle comprises a combustion chamber 2, a tubular inlet line 3 and a tubular outlet line 4 connected to the combustion chamber, a fuel injection valve 5 which opens into the combustion chamber, and an ignition device 9 which extends into the combustion chamber. The length L1 of the inlet line is approximately between 90 mm and 120 mm, and the length L2 of the outlet line is less than or equal to 200 mm, preferably between 100 mm and 115 mm. The injection frequency of the fuel injection valve is selected so as not to overlap the natural frequency of the exhaust gas burner so as to prevent resonance thereof. The diameter of the inlet line may be between 25 mm and 40 mm. The diameter of the outlet line may be between 25 mm and 30 mm.

Description

Exhaust-gas burner for a motor vehicle, and motor vehicle having an exhaust-gas burner of said type The present invention relates to an exhaust-gas burner for a motor vehicle, cornprising - a combustion chamber, - a tubular inlet line and a tubular outlet line which are fluidically connected to the combustion chamber, wherein, during the operation of the exhaust-gas burner, a fluid, in particular process air, flows into the combustion chamber through the inlet line, - an injection valve which opens into the combustion chamber and by means of which a defined fuel quantity is injected with a defined injection frequency into the combustion chamber during the operation of the exhaust-gas burner, and - an ignition device which extends into the combustion chamber and which is configured to ignite and thus burn the fuel-fluid mixture, in particular the fuel-process air mixture, within the combustion chamber, wherein the gas formed during this combustion process flows through the outlet line and passes out of the exhaust-gas burner.
The present invention furthermore relates to a motor vehicle having an exhaust-gas burner of said type.
Exhaust-gas burners of the type mentioned in the introduction are commonly used in exhaust-gas treatment devices of motor vehicles in order to improve the emissions values. Such exhaust-gas burners increase the temperature of the exhaust gas in order to trigger reactions which occur only when a certain temperature threshold is reached and which contribute to the purification of the exhaust gas. For example, soot accumulations in or blockages of a particle filter of the exhaust-gas treatment device can be removed by means of an exhaust-gas burner.
It has been found that the resonance behavior of the exhaust-gas burner influences the combustion stability thereof and, under some circumstances, can lead to an unstable combustion. Important variables that have an influence on the resonance behavior are in particular the geometry of the inlet line, the geometry of the outlet line, the geometry of the combustion chamber and the injection frequency with which the fuel is injected into the combustion chamber.
The present invention seeks to provide an exhaust-gas burner for a motor vehicle, which exhaust-gas burner exhibits particularly high combustion stability.
This can be achieved by means of an exhaust-gas burner of the type mentioned in the introduction having the features of claim 1. The dependent claims relate to advantageous developments of the invention.
An exhaust-gas burner according to an aspect of the invention is distinguished by the fact that the length L1 of the inlet line is selected so as to lie approximately between 90 mm and 120 mm, and in that the length L2 of the outlet line is selected so as to be 5 200 mm, and in that the injection frequency of the injection valve is selected so as not to overlap the natural frequency of the exhaust-gas burner. By means of the combination of these measures according to the invention, the resonance behavior of the exhaust-gas burner can advantageously be improved, such that high combustion stability can be ensured.
In one embodiment, it is proposed that the diameter D1 of the inlet line is selected so as to lie between 25 mm and 40 mm.
In one advantageous embodiment, it may be provided that the length L2 of the outlet line is selected so as to lie in the range from approximately 100 mm to approximately 115 mm. Preferably, the diameter D2 of the outlet line may then be selected so as to lie in the range from approximately 25 mm to approximately 30 mm.
A motor vehicle according to the invention is distinguished by the fact that the exhaust-gas burner is designed as claimed in any one of claims 1 to 4.
Further features and advantages of the present invention will become clear from the following description of preferred exemplary embodiments with reference to the appended drawings, in which: figure 1 is a schematically highly simplified illustration that shows the basic construction of an exhaust-gas burner for a motor vehicle, figure 2 is a graphical illustration that shows the influence of the diameter and of the length of an inlet line of the exhaust-gas burner on the combustion stability thereof, figure 3 is a graphical illustration that shows the influence of the length of an outlet line of the exhaust-gas burner on the operation irregularity thereof.
Based on the schematically highly simplified illustration in figure 1, the basic technical construction of an exhaust-gas burner 1 for a motor vehicle, which is arranged in an exhaust-gas treatment device of the motor vehicle and thus forms a part thereof, will firstly be discussed in more detail below. It is emphasized at this juncture that the schematic illustration in figure 1 serves exclusively for the purpose of providing an overview of the individual technical components of the exhaust-gas burner 1. Geometrical configurations and particular dimensions of individual components of the exhaust-gas burner 1 consequently cannot be derived from the illustration as per figure 1.
The exhaust-gas burner 1 comprises a combustion chamber 2, a tubular inlet line 3 and a tubular outlet line 4, which are fluidically connected to the combustion chamber 2. A fluid, in particular process air, can flow into the combustion chamber 2 through the inlet line 3. Furthermore, the exhaust-gas burner 1 comprises an injection valve 5 which opens into the combustion chamber 2 and by means of which a defined fuel quantity is injected with a defined injection frequency into the combustion chamber 2 during the operation of the exhaust-gas burner 1. Furthermore, the exhaust-gas burner 1 has an ignition device 9 which extends into the combustion chamber 2 and which is configured to ignite and thus burn the fuel-fluid mixture, in particular the fuel-process air mixture, within the combustion chamber 2. The gas formed during this combustion process subsequently flows through the outlet line 4 and exits the exhaust-gas burner 1.
It has been found that the resonance behavior of the exhaust-gas burner 1 influences the combustion stability thereof and, under some circumstances, can also lead to an unstable combustion. Important variables that have an influence on the resonance behavior of the exhaust-gas burner 1 are in particular the geometry of the inlet line 3, the geometry of the outlet line 4, the geometry of the combustion chamber 2 and the injection frequency with which the fuel is injected by means of the injection valve 5 into the combustion chamber 2.
Figure 2 graphically illustrates the influences of the diameter D1 and of the length Li of the inlet line 3 on the combustion stability of the exhaust-gas burner 1. In a first value pair range 6 of the diameter D1 and of the length L1 of the inlet line 3, which in this illustration is separated by a straight line 7 from a second value pair range 8 of the diameter Di and of the length L1 of the inlet line 3, a stable combustion occurs. By contrast, the combustion in the second value pair range 8 is unstable, such that a non-ideal resonance behavior of the exhaust-gas burner 1 is present there. Consequently, the diameter D1 and the length L1 of the inlet line 3 of the exhaust-gas burner 1 should be selected such that the value pairs always lie within the first value pair range 6. It is clear from this illustration that, in the case of a small diameter D1 of the inlet line 3, the length L1 thereof should likewise be selected to be relatively shod.
If the diameter D1 of the inlet line 3 is selected so as to lie between 25 mm and 40 mm, it is advantageous if the length L1 of the inlet line 3 is selected so as to lie between approximately 90 mm and 120 mm. A stable combustion can always be ensured in these ranges.
Referring to figure 3, said figure shows a number of results of tests that illustrate the influence of the length L2 of the outlet line 4 on the operation irregularity of the exhaust-gas burner 1. It can be seen from this illustration that the length L2 of the outlet line 4 should be selected such that the following applies: L2 200 mm. In this way, it is advantageously achieved that the operation irregularity always lies in the range of approximately 1% and below. Preferably, the length L2 of the outlet line 4 should be selected so as to lie in the range from approximately 100 mm to approximately 115 mm if the diameter D2 of the outlet line 4 lies in the range from approximately 25 mm to approximately 30 mm.
The resonance or natural frequencies of the exhaust-gas burner 1 are in particular dependent on the temperature, the geometry of the combustion chamber 2 and the inlet geometry. Therefore, the injection frequency of the injection valve 5 of the exhaust-gas burner 1 is selected so as not to overlap the natural frequency of the exhaust-gas burner 1.

Claims (4)

  1. Patent claims 1 An exhaust-gas burner for a motor vehicle, comprising - a combustion chamber, - a tubular inlet line and a tubular outlet line which are fluidically connected to the combustion chamber, wherein, during the operation of the exhaust-gas burner, a fluid, in particular process air, flows into the combustion chamber through the inlet line, - an injection valve which opens into the combustion chamber and by means of which a defined fuel quantity is injected with a defined injection frequency into the combustion chamber during the operation of the exhaust-gas burner, and - an ignition device which extends into the combustion chamber and which is configured to ignite and thus burn the fuel-fluid mixture, in particular the fuel-process air mixture, within the combustion chamber, wherein the gas formed during this combustion process flows through the outlet line and passes out of the exhaust-gas burner, and wherein the length of the inlet line is selected so as to lie approximately between 90 mm and 120 mm, and in that the length of the outlet line is selected so as to be 200 mm, and in that the injection frequency of the injection valve is selected so as not to overlap the natural frequency of the exhaust-gas burner.
  2. 2. The exhaust gas-burner as claimed in claim 1, wherein the diameter of the inlet line is selected so as to lie between 25 mm and 40 mm.
  3. 3. The exhaust-gas burner as claimed in either one of claims 1 and 2, wherein the length of the outlet line is selected so as to lie in the range from approximately 100 mm to approximately 115 mm.
  4. 4. The exhaust-gas burner as claimed in any one of claims 1 to 3, wherein the diameter of the outlet line is selected so as to lie in the range from approximately 25 mm to approximately 30 mm.A motor vehicle comprising an exhaust-gas burner which is arranged in an exhaust-gas treatment device of the motor vehicle, wherein the exhaust-gas burner is as claimed in any one of claims 1 to 4.
GB2115793.8A 2020-11-03 2021-11-03 Exhaust-gas burner for a motor vehicle, and motor vehicle having an exhaust-gas burner of said type Active GB2601903B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020128936.7A DE102020128936B3 (en) 2020-11-03 2020-11-03 Exhaust gas burner for a motor vehicle and motor vehicle with such an exhaust gas burner

Publications (3)

Publication Number Publication Date
GB202115793D0 GB202115793D0 (en) 2021-12-15
GB2601903A true GB2601903A (en) 2022-06-15
GB2601903B GB2601903B (en) 2022-11-30

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GB2115793.8A Active GB2601903B (en) 2020-11-03 2021-11-03 Exhaust-gas burner for a motor vehicle, and motor vehicle having an exhaust-gas burner of said type

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GB (1) GB2601903B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020101799A1 (en) * 2020-01-27 2021-07-29 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Device and method for operating a fuel burner

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5408970A (en) 1994-05-02 1995-04-25 General Motors Corporation Electronically controlled continuous flow fuel system
JP5827136B2 (en) 2012-01-12 2015-12-02 日野自動車株式会社 Engine exhaust purification system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020101799A1 (en) * 2020-01-27 2021-07-29 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Device and method for operating a fuel burner

Also Published As

Publication number Publication date
GB2601903B (en) 2022-11-30
DE102020128936B3 (en) 2022-03-31
GB202115793D0 (en) 2021-12-15

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