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EP2045450B1 - Device for vaporising diesel and automobile exhaust line comprising this vaporisation device - Google Patents

Device for vaporising diesel and automobile exhaust line comprising this vaporisation device Download PDF

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Publication number
EP2045450B1
EP2045450B1 EP08165600A EP08165600A EP2045450B1 EP 2045450 B1 EP2045450 B1 EP 2045450B1 EP 08165600 A EP08165600 A EP 08165600A EP 08165600 A EP08165600 A EP 08165600A EP 2045450 B1 EP2045450 B1 EP 2045450B1
Authority
EP
European Patent Office
Prior art keywords
diesel
base
exhaust line
vaporizing
exhaust
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.)
Not-in-force
Application number
EP08165600A
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German (de)
French (fr)
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EP2045450A1 (en
Inventor
Frédéric Vilette
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2045450A1 publication Critical patent/EP2045450A1/en
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Publication of EP2045450B1 publication Critical patent/EP2045450B1/en
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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
    • F01N3/0253—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 adding fuel to exhaust gases
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/107—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance using glow plug heating elements

Definitions

  • the present invention generally relates to the field of exhaust of the combustion gases of a heat engine and more particularly the field of the exhaust with the use of pollution control elements such as a catalyst or a particulate filter with a post-injection of diesel for the cleaning of these elements.
  • pollution control elements such as a catalyst or a particulate filter with a post-injection of diesel for the cleaning of these elements.
  • FIG. figure 1 of this application Such a device for vaporizing diesel fuel, known from the state of the art, is shown in FIG. figure 1 of this application.
  • This device is positioned upstream of a catalyst of an exhaust line being disposed outside thereof, for example against it or an element leading to this catalyst.
  • This device essentially comprises a diesel inlet tube 1 from, for example, the diesel fuel opening at one end of a tube 3 incorporating a spark plug 2 at its other end and forming the body of the device at the same time as the a gasoline vaporization system by spark of the spark plug 2, a gasoline 4 vaporization outlet being provided laterally for supplying diesel vapor of the catalyst, generally in a pipe having a curved tube shape.
  • This diesel vaporization device is positioned on this bent tube by a support 8 of the body 3 of the device on this tube.
  • the object of the present invention is to integrate a compact-shaped gas oil spraying device into an element of the exhaust line in order to ensure the protection of this device and to simplify its fixing on this element.
  • the subject of the invention is a device for vaporizing diesel fuel, comprising a diesel feed inlet, a spark plug and a body having a vaporized gas oil outlet, this device being intended for vaporizing diesel fuel upstream of the catalyst of the exhaust line of a motor vehicle, characterized in that the spark plug, the diesel fuel are arranged on the same side of the body being fixed on a base connected to the body, said base being intended to come in abutment against said exhaust line at a suitable orifice, the body extending opposite the spark plug and the diesel feed inlet relative to the base and being intended to penetrate the interior of the exhaust line, said body having on its periphery, away from the base, the vaporized gas oil outlet.
  • the invention also relates to an exhaust line comprising a catalyst and a particulate filter and to such a device for vaporizing diesel fuel, characterized in that the body of the vaporization device is entirely incorporated in this line while the base of it rests on the outer surface of this exhaust line.
  • the part of the exhaust line receiving the body of the vaporization device is in the form of a bent tube located before the oxidation catalyst or forming the inlet of this catalyst, the base of the vaporization device resting on the bent part of the tube.
  • the bent tube is formed of two longitudinal shells made by stamping, each of these two shells carrying a complementary recess for housing the body of the vaporization device inside thereof prior to their joining to form the tube.
  • the diesel vaporization device is connected to the exhaust line L while remaining outside thereof with only the vaporized gas oil outlet tube 4 penetrating in a part of the exhaust line L, here shown in the form of a bent tube 5, which can form the inlet cone of the catalyst.
  • a base 6a for an oxygen probe 6, in order to control the concentration of oxygen in the exhaust gases of the line.
  • This solution has a low mechanical strength, a loss of heat because the body is disposed outside the exhaust line. In addition, it requires a chain mounting time for the positioning of the spray device on the exhaust line.
  • FIGS. 3 and 4 are views of a diesel fuel spraying device according to the present invention.
  • this device applies to diesel engine vehicles equipped with a particulate filter and equipped with diesel fuel injection technology exhaust.
  • This device comprises a diesel fuel supply inlet 1, a spark plug 2 and a body 3 having a vaporized gas oil outlet 4.
  • the spark plug 2 and the diesel feed 1 are arranged on the same side of the body 3 while being fixed on a base 7 connected to the body 3, the body 3 having on its periphery the vaporized gas oil outlet 4.
  • the feed elements 1 and ignition 2, diesel fuel and candle are grouped on the same side, that is to say on the side of the base 7 opposite the body 3, which represents a saving of space, hence a decrease in the size of the device.
  • an oxygen sensor 6 is also placed with the supply elements 1 and ignition 2 on the base 7, said base 7 thus joining several elements 1, 2, 6 to be connected to the exhaust line. It should be borne in mind, however, that the addition of an oxygen probe 6 to the device Spraying is an optional measure and the device can very well fulfill its role without this probe.
  • the base 7 has recesses corresponding to these various elements 1, 2, 6 to allow mainly the supply of diesel fuel and the combustion of this diesel fuel by the action of the candle 2 in the body 3.
  • This body 3 is located on the other side of the base 7 that that receiving the diesel fuel 1 and the spark plug 2 and extends substantially perpendicularly to the base 7 with the gas oil vaporization tube 4 in its central longitudinal portion or its end longitudinal portion opposite to that connected with the base 7.
  • the body 3 and the base 7 form a single piece and, advantageously, the body 3 and / or the base 7 are made by molding and machining.
  • the body 3 of the diesel vaporization device is fully incorporated in this line L while its base 7 rests on the outer surface of this line L exhaust.
  • the part of the exhaust line L accommodating the body 3 of the vaporization device is in the form of a bent tube 5 located before the oxidation catalyst or forming the inlet of this catalyst.
  • This tube shape makes it possible to better incorporate the body 3 having a certain length in the exhaust line L while ensuring complete support of the base 7 against the wall of the bent tube 5 of this line L.
  • the base 7 of the device of vaporization is based on the bent part of the tube 5.
  • the body 3 which is the part of the device where the vaporization of diesel fuel occurs is in the line L exhaust and there is virtually no heat loss.
  • the bent tube 5 is formed of two longitudinal shells 5a and 5b formed by stamping, each of these two shells 5a and 5b carrying a complementary recess for housing the body of the vaporization device inside of them beforehand. their solidarization to form the tube 5. The edges of this housing have sufficient support to the base 7 which rests on them.
  • This joining can be carried out by any means, for example by welding or gluing or fixing by mechanical means.
  • the regeneration mechanism of the particulate filter is as follows.
  • the vaporization of the gas oil and its oxidation on the catalyst raises the temperature thereof, preferably between 550 ° C and 650 ° C, which allows to burn the soot particles present in the particulate filter after this catalyst.
  • regeneration of the particulate filter must be avoided, which may lead to its destruction. Too much diesel fuel injection can also lead to increases in unburned hydrocarbons at the exit of the exhaust line L, which is undesirable with respect to compliance with antipollution standards.
  • an oxygen probe 6 a preferred but non-essential characteristic of the present invention, makes it possible to better regulate the regeneration of the particulate filter.
  • this can advantageously be controlled by a control logic, the injection of diesel being controlled in the case where a regeneration of the particulate filter of the exhaust line is necessary and controlled according to the temperature of the exhaust gases so that they exceed a certain temperature allowing regeneration of the particulate filter but remain in below another temperature threshold being dangerous for the conservation of this filter, other parameters, such as, for example, the oxygen content of the exhaust gas can be taken into consideration.
  • This temperature threshold depends on the type of particulate filter but is generally above about 670 ° C.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The device has a diesel supply inlet (1) and a spark plug (2) arranged on same side of a body (3). A base (7) is connected to the body and is supported against an exhaust line (L) of a diesel motor vehicle to a right of a suited opening. The body extends opposite of the spark plug and the inlet with respect to the base, where the body penetrates inside the exhaust line from distance of the base. A vaporized diesel outlet tube (4) is provided on a periphery of the body, where the body and the base form a mono-block part.

Description

La présente invention concerne d'une façon générale le domaine de l'échappement des gaz de combustion d'un moteur thermique et de façon plus particulière le domaine de l'échappement avec utilisation d'éléments de dépollution comme un catalyseur ou un filtre à particules avec une post-injection de gazole pour le nettoyage de ces éléments.The present invention generally relates to the field of exhaust of the combustion gases of a heat engine and more particularly the field of the exhaust with the use of pollution control elements such as a catalyst or a particulate filter with a post-injection of diesel for the cleaning of these elements.

Les normes concernant la pollution des véhicules automobiles deviennent de plus en plus sévères. Cela pousse les constructeurs automobiles à trouver des solutions techniques pour répondre à ces contraintes. L'utilisation de catalyseur et de filtre à particules s'est donc généralisée. Il convient cependant de nettoyer régulièrement ces éléments qui peuvent s'encrasser du fait de l'accumulation de particules sur ceux-ci.The standards concerning pollution of motor vehicles are becoming more and more severe. This is pushing car manufacturers to find technical solutions to meet these constraints. The use of catalyst and particulate filter is therefore widespread. However, it is necessary to regularly clean these elements that can become dirty due to the accumulation of particles on them.

Pour effectuer ce nettoyage, il est connu d'injecter un mélange homogène d'air et de gazole sur le catalyseur d'oxydation situé en amont du système de filtration de manière à augmenter comme pour une combustion la température des gaz d'échappement. Un niveau élevé de température est en effet nécessaire pour oxyder et brûler les particules charbonneuses ou de suie produites par le moteur et retenues sur ce système de filtration afin d'éviter leur accumulation et l'encrassement de celui-ci. Cette opération est appelée phase de régénération du système de filtration.To carry out this cleaning, it is known to inject a homogeneous mixture of air and diesel fuel on the oxidation catalyst situated upstream of the filtration system so as to increase the temperature of the exhaust gases as for a combustion. A high level of temperature is indeed necessary to oxidize and burn the carbonaceous particles or soot produced by the engine and retained on this filtration system to prevent their accumulation and fouling thereof. This operation is called the regeneration phase of the filtration system.

Un tel dispositif de vaporisation de gazole, connu de l'état de la technique, est montré à la figure 1 de la présente demande. Ce dispositif est positionné en amont d'un catalyseur d'une ligne d'échappement en étant disposé à l'extérieur de celui-ci, par exemple contre celui-ci ou un élément menant à ce catalyseur. Ce dispositif comprend essentiellement un tube d'entrée de gazole 1 en provenance, par exemple, de la réserve de gazole débouchant à une extrémité d'un tube 3 intégrant une bougie 2 à son autre extrémité et formant le corps du dispositif en même temps que le système de vaporisation du gazole par étincelle de la bougie 2, une sortie de vaporisation 4 gazole étant prévue latéralement pour l'alimentation en vapeur de gazole du catalyseur, généralement dans un conduit présentant une forme de tube cintré. Ce dispositif de vaporisation gazole est positionné sur ce tube cintré par un appui 8 du corps 3 du dispositif sur ce tube.Such a device for vaporizing diesel fuel, known from the state of the art, is shown in FIG. figure 1 of this application. This device is positioned upstream of a catalyst of an exhaust line being disposed outside thereof, for example against it or an element leading to this catalyst. This device essentially comprises a diesel inlet tube 1 from, for example, the diesel fuel opening at one end of a tube 3 incorporating a spark plug 2 at its other end and forming the body of the device at the same time as the a gasoline vaporization system by spark of the spark plug 2, a gasoline 4 vaporization outlet being provided laterally for supplying diesel vapor of the catalyst, generally in a pipe having a curved tube shape. This diesel vaporization device is positioned on this bent tube by a support 8 of the body 3 of the device on this tube.

Il est facile d'observer qu'un tel dispositif ne présente pas une forme compacte et qu'il est encombrant et demande une adaptation sur la ligne d'échappement sur laquelle il va être fixé et que sa protection n'est pas assurée efficacement.It is easy to observe that such a device does not have a compact shape and is bulky and requires adaptation to the exhaust line on which it will be fixed and that its protection is not ensured effectively.

La présente invention a pour but d'intégrer un dispositif de vaporisation de gazole de forme compacte dans un élément de la ligne d'échappement afin d'assurer la protection de ce dispositif et de simplifier sa fixation sur cet élément.The object of the present invention is to integrate a compact-shaped gas oil spraying device into an element of the exhaust line in order to ensure the protection of this device and to simplify its fixing on this element.

A cet effet, l'invention a pour objet un dispositif de vaporisation de gazole, comprenant une entrée d'alimentation de gazole, une bougie d'allumage et un corps présentant une sortie de gazole vaporisé, ce dispositif étant destiné à vaporiser du gazole en amont du catalyseur de la ligne d'échappement d'un véhicule automobile, caractérisé en ce que la bougie, l'alimentation de gazole sont disposées du même côté du corps en étant fixé sur un socle relié au corps, ledit socle étant destiné à venir en appui contre ladite ligne d'échappement au droit d'un orifice adapté, le corps s'étendant à l'opposé de la bougie et de l'entrée d'alimentation de gazole par rapport au socle et étant destiné à pénétrer à l'intérieur de la ligne d'échappement, ledit corps présentant sur sa périphérie, à distance du socle, la sortie de gazole vaporisé.For this purpose, the subject of the invention is a device for vaporizing diesel fuel, comprising a diesel feed inlet, a spark plug and a body having a vaporized gas oil outlet, this device being intended for vaporizing diesel fuel upstream of the catalyst of the exhaust line of a motor vehicle, characterized in that the spark plug, the diesel fuel are arranged on the same side of the body being fixed on a base connected to the body, said base being intended to come in abutment against said exhaust line at a suitable orifice, the body extending opposite the spark plug and the diesel feed inlet relative to the base and being intended to penetrate the interior of the exhaust line, said body having on its periphery, away from the base, the vaporized gas oil outlet.

Selon des caractéristiques additionnelles de la présente invention :

  • le corps et le socle du dispositif forment une pièce monobloc,
  • le corps et/ou le socle du dispositif sont réalisés par moulage et usinage,
  • le dispositif comprend une sonde à oxygène, celle-ci présentant une partie fixée sur le socle du dispositif tandis que sa partie de mesure s'étend dans son corps,
  • le dispositif est associé à une logique de commande, l'injection de gazole étant commandée dans le cas où une régénération du filtre à particules de la ligne d'échappement est requise et contrôlée selon la température des gaz d'échappement afin que ceux-ci dépassent une certaine température permettant la régénération du filtre à particules mais restent en dessous d'un autre seuil de température s'avérant dangereux pour la conservation de ce filtre, d'autres paramètres, comme, par exemple, la teneur en oxygène des gaz d'échappement pouvant être pris en outre en considération par la logique de commande.
According to additional features of the present invention:
  • the body and the base of the device form a single piece,
  • the body and / or the base of the device are made by molding and machining,
  • the device comprises an oxygen sensor, the latter having a part fixed on the base of the device while its measuring part extends in its body,
  • the device is associated with a control logic, the injection of diesel being controlled in the case where a regeneration of the particulate filter of the exhaust line is required and controlled according to the temperature of the exhaust gases so that these exceed a certain temperature allowing the regeneration of the particulate filter but remain below another temperature threshold proving to be dangerous for the preservation of this filter, other parameters, such as, for example, the oxygen content of the particulate gas. This escapement can also be taken into consideration by the control logic.

L'invention concerne aussi une ligne d'échappement comprenant un catalyseur et un filtre à particules ainsi qu'un tel dispositif de vaporisation de gazole, caractérisée en ce que le corps du dispositif de vaporisation est entièrement incorporé dans cette ligne tandis que le socle de celui-ci repose sur la surface externe de cette ligne d'échappement.
Avantageusement, la partie de la ligne d'échappement recevant le corps du dispositif de vaporisation est sous forme d'un tube cintré se trouvant avant le catalyseur d'oxydation ou formant l'entrée de ce catalyseur, le socle du dispositif de vaporisation reposant sur la partie cintrée du tube.The invention also relates to an exhaust line comprising a catalyst and a particulate filter and to such a device for vaporizing diesel fuel, characterized in that the body of the vaporization device is entirely incorporated in this line while the base of it rests on the outer surface of this exhaust line.
Advantageously, the part of the exhaust line receiving the body of the vaporization device is in the form of a bent tube located before the oxidation catalyst or forming the inlet of this catalyst, the base of the vaporization device resting on the bent part of the tube.

Préférentiellement, le tube cintré est formé de deux coquilles longitudinales réalisées par emboutissage, chacune de ces deux coquilles portant un évidement complémentaire pour le logement du corps du dispositif de vaporisation à l'intérieur de celles-ci préalablement à leur solidarisation pour former le tube.Preferably, the bent tube is formed of two longitudinal shells made by stamping, each of these two shells carrying a complementary recess for housing the body of the vaporization device inside thereof prior to their joining to form the tube.

L'invention va maintenant être décrite plus en détail mais de façon non limitative en regard des figures annexées, dans lesquelles :

  • la figure 1 est une représentation schématique d'un dispositif de vaporisation de gazole selon l'état de la technique,
  • la figure 2 est une représentation schématique de la fixation d'un dispositif de vaporisation de gazole selon l'état de la technique sur une ligne d'échappement,
  • la figure 3 est une vue schématique de dessus d'un dispositif de vaporisation de gazole selon la présente invention,
  • la figure 4 est une vue schématique en perspective d'un dispositif de vaporisation de gazole selon la présente invention,
  • la figure 5 est une vue schématique en coupe d'une ligne d'échappement incorporant un dispositif de vaporisation de gazole selon la présente invention,
  • la figure 6 est une vue schématique en perspective d'une ligne d'échappement incorporant un dispositif de vaporisation de gazole selon la présente invention.
The invention will now be described in more detail but in a nonlimiting manner with reference to the appended figures, in which:
  • the figure 1 is a schematic representation of a diesel fuel vaporization device according to the state of the art,
  • the figure 2 is a schematic representation of the fixing of a diesel fuel vaporization device according to the state of the art on an exhaust line,
  • the figure 3 is a diagrammatic view from above of a diesel fuel vaporization device according to the present invention,
  • the figure 4 is a schematic perspective view of a diesel fuel vaporization device according to the present invention,
  • the figure 5 is a schematic sectional view of an exhaust line incorporating a diesel fuel vaporization device according to the present invention,
  • the figure 6 is a schematic perspective view of an exhaust line incorporating a diesel fuel spraying device according to the present invention.

La figure 1 déjà été détaillée dans la présente description.The figure 1 already been detailed in the present description.

A la figure 2, selon l'état de la technique, le dispositif de vaporisation de gazole est relié à la ligne d'échappement L en restant à l'extérieur de celle-ci avec seul le tube de sortie de gazole vaporisé 4 pénétrant dans une partie de la ligne d'échappement L, ici montrée sous la forme d'un tube cintré 5, pouvant former le cône d'entrée du catalyseur. Accessoirement, à un autre endroit du tube cintré 5 que celui recevant le dispositif de vaporisation, se trouve une embase 6a pour une sonde oxygène 6, afin de contrôler la concentration d'oxygène dans les gaz d'échappement de la ligne.To the figure 2 according to the state of the art, the diesel vaporization device is connected to the exhaust line L while remaining outside thereof with only the vaporized gas oil outlet tube 4 penetrating in a part of the exhaust line L, here shown in the form of a bent tube 5, which can form the inlet cone of the catalyst. Incidentally, at another place of the bent tube 5 than that receiving the vaporizer device, there is a base 6a for an oxygen probe 6, in order to control the concentration of oxygen in the exhaust gases of the line.

Cette solution présente une faible résistance mécanique, une déperdition de chaleur du fait que le corps est disposé à l'extérieur de la ligne d'échappement. De plus, elle requiert un temps de montage sur chaîne pour le positionnement du dispositif de vaporisation sur la ligne d'échappement.This solution has a low mechanical strength, a loss of heat because the body is disposed outside the exhaust line. In addition, it requires a chain mounting time for the positioning of the spray device on the exhaust line.

Les figures 3 et 4 sont des vues d'un dispositif de vaporisation de gazole selon la présente invention.The Figures 3 and 4 are views of a diesel fuel spraying device according to the present invention.

Comme déjà énoncé, ce dispositif s'applique aux véhicules à motorisation Diesel équipés d'un filtre à particules et équipés d'une technologie d'injection de gazole à l'échappement.As already stated, this device applies to diesel engine vehicles equipped with a particulate filter and equipped with diesel fuel injection technology exhaust.

Ce dispositif comprend une entrée d'alimentation 1 en gazole, une bougie 2 d'allumage et un corps 3 présentant une sortie de gazole 4 vaporisé. La bougie 2 et l'alimentation 1 gazole sont disposées du même côté du corps 3 en étant fixées sur un socle 7 relié au corps 3, le corps 3 présentant sur sa périphérie la sortie de gazole vaporisé 4. Ainsi les éléments d'alimentation 1 et d'ignition 2, alimentation gazole et bougie, sont regroupés d'un même côté, c'est-à-dire du côté du socle 7 opposé au corps 3, ce qui représente un gain de place, d'où une diminution de l'encombrement du dispositif.This device comprises a diesel fuel supply inlet 1, a spark plug 2 and a body 3 having a vaporized gas oil outlet 4. The spark plug 2 and the diesel feed 1 are arranged on the same side of the body 3 while being fixed on a base 7 connected to the body 3, the body 3 having on its periphery the vaporized gas oil outlet 4. Thus the feed elements 1 and ignition 2, diesel fuel and candle, are grouped on the same side, that is to say on the side of the base 7 opposite the body 3, which represents a saving of space, hence a decrease in the size of the device.

Accessoirement, une sonde à oxygène 6 est aussi placée avec les éléments d'alimentation 1 et d'ignition 2 sur le socle 7, ledit socle 7 permettant ainsi de réunir plusieurs éléments 1, 2, 6 à raccorder à la ligne d'échappement. Il convient cependant de garder à l'esprit que l'adjonction d'une sonde oxygène 6 dans le dispositif de vaporisation est une mesure facultative et que le dispositif peut très bien remplir son rôle sans cette sonde.Incidentally, an oxygen sensor 6 is also placed with the supply elements 1 and ignition 2 on the base 7, said base 7 thus joining several elements 1, 2, 6 to be connected to the exhaust line. It should be borne in mind, however, that the addition of an oxygen probe 6 to the device Spraying is an optional measure and the device can very well fulfill its role without this probe.

Le socle 7 présente des évidements correspondants à ces divers éléments 1, 2, 6 pour permettre principalement l'alimentation en gazole et la combustion de ce gazole par l'action de la bougie 2 dans le corps 3. Ce corps 3 se trouve de l'autre côté du socle 7 que celui recevant l'alimentation 1 gazole et la bougie 2 et s'étend sensiblement perpendiculairement au socle 7 avec le tube de vaporisation 4 gazole dans sa partie longitudinale médiane ou sa partie longitudinale d'extrémité opposée à celle reliée avec le socle 7.The base 7 has recesses corresponding to these various elements 1, 2, 6 to allow mainly the supply of diesel fuel and the combustion of this diesel fuel by the action of the candle 2 in the body 3. This body 3 is located on the other side of the base 7 that that receiving the diesel fuel 1 and the spark plug 2 and extends substantially perpendicularly to the base 7 with the gas oil vaporization tube 4 in its central longitudinal portion or its end longitudinal portion opposite to that connected with the base 7.

Préférentiellement, le corps 3 et le socle 7 forment une pièce monobloc et, avantageusement, le corps 3 et/ou le socle 7 sont réalisés par moulage et usinage.Preferably, the body 3 and the base 7 form a single piece and, advantageously, the body 3 and / or the base 7 are made by molding and machining.

Aux figures 5 et 6, il est montré comment le dispositif de vaporisation de gazole, objet de l'invention, est incorporé dans une ligne L d'échappement.To the Figures 5 and 6 , it is shown how the diesel vaporization device, object of the invention, is incorporated in an exhaust line L.

Le corps 3 du dispositif de vaporisation de gazole est entièrement incorporé dans cette ligne L tandis que son socle 7 repose sur la surface externe de cette ligne L d'échappement. Sur les figures 5 et 6, la partie de la ligne L d'échappement logeant le corps 3 du dispositif de vaporisation est sous la forme d'un tube cintré 5 se trouvant avant le catalyseur d'oxydation ou formant l'entrée de ce catalyseur. Cette forme en tube permet de mieux incorporer le corps 3 présentant une certaine longueur dans la ligne L d'échappement tout en assurant un appui complet du socle 7 contre la paroi du tube cintré 5 de cette ligne L. Avantageusement, le socle 7 du dispositif de vaporisation repose sur la partie cintrée du tube 5.The body 3 of the diesel vaporization device is fully incorporated in this line L while its base 7 rests on the outer surface of this line L exhaust. On the Figures 5 and 6 the part of the exhaust line L accommodating the body 3 of the vaporization device is in the form of a bent tube 5 located before the oxidation catalyst or forming the inlet of this catalyst. This tube shape makes it possible to better incorporate the body 3 having a certain length in the exhaust line L while ensuring complete support of the base 7 against the wall of the bent tube 5 of this line L. Advantageously, the base 7 of the device of vaporization is based on the bent part of the tube 5.

Ainsi, le corps 3 qui est la partie du dispositif où se produit la vaporisation du gazole se trouve dans la ligne L d'échappement et il n'y a donc pratiquement pas de perte de chaleur.Thus, the body 3 which is the part of the device where the vaporization of diesel fuel occurs is in the line L exhaust and there is virtually no heat loss.

Préférentiellement, le tube cintré 5 est formé de deux coquilles 5a et 5b longitudinales réalisées par emboutissage, chacune de ces deux coquilles 5a et 5b portant un évidement complémentaire pour le logement du corps du dispositif de vaporisation à l'intérieur de celles-ci préalablement à leur solidarisation afin de former le tube 5. Les bords de ce logement présentent un appui suffisant au socle 7 qui repose sur ceux-ci.Preferably, the bent tube 5 is formed of two longitudinal shells 5a and 5b formed by stamping, each of these two shells 5a and 5b carrying a complementary recess for housing the body of the vaporization device inside of them beforehand. their solidarization to form the tube 5. The edges of this housing have sufficient support to the base 7 which rests on them.

Cette solidarisation peut être effectuée par un moyen quelconque, par exemple par soudage ou collage ou fixation par des moyens mécaniques.This joining can be carried out by any means, for example by welding or gluing or fixing by mechanical means.

Le mécanisme de régénération du filtre à particules est le suivant. La vaporisation du gazole et son oxydation sur le catalyseur élève la température de celui-ci, de préférence entre 550°C et 650°C, ce qui permet de brûler les particules de suies présentes dans le filtre à particules se trouvant après ce catalyseur. Il convient cependant d'éviter un emballement de la régénération du filtre à particules ce qui peut provoquer sa destruction. Une trop forte injection de gazole peut aussi conduire à des augmentations d'hydrocarbures imbrûlés à la sortie de la ligne L d'échappement ce qui est indésirable vis à vis du respect des normes antipollution.The regeneration mechanism of the particulate filter is as follows. The vaporization of the gas oil and its oxidation on the catalyst raises the temperature thereof, preferably between 550 ° C and 650 ° C, which allows to burn the soot particles present in the particulate filter after this catalyst. However, regeneration of the particulate filter must be avoided, which may lead to its destruction. Too much diesel fuel injection can also lead to increases in unburned hydrocarbons at the exit of the exhaust line L, which is undesirable with respect to compliance with antipollution standards.

L'emploi d'une sonde à oxygène 6, caractéristique préférentielle mais non essentielle de la présente invention, permet de mieux réguler la régénération du filtre à particules. En ce qui concerne le dispositif de vaporisation, celui-ci peut avantageusement être commandé par une logique de commande, l'injection de gazole étant commandée dans le cas où une régénération du filtre à particules de la ligne d'échappement est nécessaire et contrôlée selon la température des gaz d'échappement afin que ceux-ci dépassent une certaine température permettant la régénération du filtre à particules mais restent en dessous d'un autre seuil de température s'avérant dangereux pour la conservation de ce filtre, d'autres paramètres, comme, par exemple, la teneur en oxygène des gaz d'échappement pouvant être pris en considération.The use of an oxygen probe 6, a preferred but non-essential characteristic of the present invention, makes it possible to better regulate the regeneration of the particulate filter. With regard to the vaporization device, this can advantageously be controlled by a control logic, the injection of diesel being controlled in the case where a regeneration of the particulate filter of the exhaust line is necessary and controlled according to the temperature of the exhaust gases so that they exceed a certain temperature allowing regeneration of the particulate filter but remain in below another temperature threshold being dangerous for the conservation of this filter, other parameters, such as, for example, the oxygen content of the exhaust gas can be taken into consideration.

Ce seuil de température dépend selon le type de filtre à particules mais est situé généralement au dessus d'environ 670°C.This temperature threshold depends on the type of particulate filter but is generally above about 670 ° C.

Les avantages techniques du dispositif de vaporisation gazole selon la présente invention, par rapport aux propositions de l'état de la technique sont les suivants:

  • une simplification du système industriel obtenue grâce à la limitation du nombre de fournisseurs de composants des lignes échappement équipées du système, le fournisseur de la ligne étant aussi le fournisseur du dispositif de vaporisation gazole,
  • une robustesse mécanique et une limitation des impacts thermiques,
  • une modularité au montage pour des groupes motopropulseurs industrialisés à fort volume.
The technical advantages of the diesel vaporization device according to the present invention, compared to the proposals of the state of the art are as follows:
  • a simplification of the industrial system obtained by limiting the number of suppliers of exhaust system components equipped with the system, the supplier of the line also being the supplier of the diesel fuel spraying device,
  • mechanical robustness and limitation of thermal impacts,
  • assembly modularity for large volume industrial powertrains.

Les avantages économiques du dispositif de vaporisation gazole, selon la présente invention, sont les suivants :

  • une conception dans une logique globale limitant les diversités entre les lignes échappement équipées ou non équipées, d'où un coût moins élevé que les systèmes actuels,
  • une diminution des risques de défaillance pour le client,
  • un montage réduit en usine moteur, étant donné que le dispositif de vaporisation peut avoir été monté sur la ligne d'échappement préalablement au montage de celle-ci sur le véhicule automobile.
The economic advantages of the diesel vaporization device according to the present invention are as follows:
  • a design in a global logic limiting the diversities between the exhaust lines equipped or not equipped, resulting in a lower cost than current systems,
  • a decrease in the risk of failure for the customer,
  • a reduced installation in the engine plant, since the spraying device may have been mounted on the exhaust line prior to mounting thereof on the motor vehicle.

Claims (8)

  1. Device for vaporizing diesel, comprising a diesel supply inlet (1), a spark plug (2) and a body (3) having an outlet (4) for vaporized diesel, this device being intended for vaporizing diesel upstream of an oxidation catalyzer placed upstream of a particle filter in an exhaust line (L) of a motor vehicle, characterized in that the spark plug (2), the diesel supply inlet (1) are arranged on the same side of the body (3) being directly fixed on a base (7) connected to the body (3), the said base being intended to come to rest against the said exhaust line perpendicular to an adapted opening, the body (3) extending opposite the spark plug and the diesel supply inlet with respect to the base (7) and being intended to penetrate the interior of the exhaust line, the said body (3) having on its periphery, spaced apart from the base (7), the outlet (4) for vaporized diesel.
  2. Device for vaporizing diesel according to Claim 1, characterized in that the body (3) and the base (7) form a single-piece part.
  3. Device for vaporizing diesel according to Claim 1 or 2, characterized in that the body (3) and/or the base (7) are made by moulding and machining.
  4. Device for vaporizing diesel according to any one of Claims 1 to 3, characterized in that it comprises an oxygen probe (6), the latter having a fixed part on the base (7) of the device whilst its measuring part extends in the body (3) of the device.
  5. Device for vaporizing diesel according to any one of Claims 1 to 4, characterized in that it is associated with a control logic, the injection of diesel being controlled in the case where a regeneration of the particle filter of the exhaust line (L) is required and controlled according to the temperature of the exhaust gases such that the latter exceed a certain temperature allowing the regeneration of the particle filter but remain below another temperature threshold proving dangerous for the preservation of this filter, other parameters such as for example the oxygen content of the exhaust gases being able to be taken into consideration in addition by the control logic.
  6. Exhaust line (L) comprising a catalyzer and a particle filter and also a device for vaporizing diesel according to any one of the preceding claims, characterized in that the body (3) of the vaporization device is incorporated entirely in this line (L), whilst the base (7) thereof rests on the external surface of this exhaust line (L).
  7. Exhaust line (L) according to the preceding claim, characterized in that its part receiving the body (3) of the vaporization device is in the form of a curved tube (5) situated before the oxidation catalyzer or forming the inlet of this catalyzer, the base (7) of the vaporization device resting on the curved part of the tube (5).
  8. Exhaust line (L) according to Claim 7, characterized in that the curved tube (5) is formed by two longitudinal shells (5a, 5b) made by stamping, each of these two shells (5a, 5b) having a complementary recess for housing the body (3) of the vaporization device inside these shells prior to their being made integral with each other to form the tube (5).
EP08165600A 2007-10-04 2008-10-01 Device for vaporising diesel and automobile exhaust line comprising this vaporisation device Not-in-force EP2045450B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0758052A FR2921968A1 (en) 2007-10-04 2007-10-04 GAS VAPORIZATION DEVICE AND AUTOMOTIVE VEHICLE EXHAUST LINE COMPRISING SAID VAPORIZATION DEVICE.

Publications (2)

Publication Number Publication Date
EP2045450A1 EP2045450A1 (en) 2009-04-08
EP2045450B1 true EP2045450B1 (en) 2011-02-23

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EP08165600A Not-in-force EP2045450B1 (en) 2007-10-04 2008-10-01 Device for vaporising diesel and automobile exhaust line comprising this vaporisation device

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EP (1) EP2045450B1 (en)
AT (1) ATE499512T1 (en)
DE (1) DE602008005081D1 (en)
FR (1) FR2921968A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4242091C2 (en) * 1992-12-14 2002-11-07 Deutz Ag Device for starting the regeneration burner of a particle filter system at low temperatures
DE10256769B4 (en) * 2002-12-05 2005-10-06 Zeuna-Stärker GmbH & Co KG Motor vehicle with a diesel drive motor
US20050150218A1 (en) * 2004-01-13 2005-07-14 Crawley Wilbur H. Method and apparatus for determining accumulation in a particulate filter of an emission abatement assembly
FR2904361A1 (en) * 2006-07-26 2008-02-01 Renault Sas DEVICE FOR VAPORIZING FUEL IN A THERMAL ENGINE EXHAUST LINE

Also Published As

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EP2045450A1 (en) 2009-04-08
FR2921968A1 (en) 2009-04-10
DE602008005081D1 (en) 2011-04-07
ATE499512T1 (en) 2011-03-15

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