FR2782745A1 - Exhaust system for heat engines especially automobiles, has heat exchanger fitted with by pass valve to allow exhaust flow to be controlled through heat exchanger or by pass by single valve - Google Patents

Exhaust system for heat engines especially automobiles, has heat exchanger fitted with by pass valve to allow exhaust flow to be controlled through heat exchanger or by pass by single valve Download PDF

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Publication number
FR2782745A1
FR2782745A1 FR9810909A FR9810909A FR2782745A1 FR 2782745 A1 FR2782745 A1 FR 2782745A1 FR 9810909 A FR9810909 A FR 9810909A FR 9810909 A FR9810909 A FR 9810909A FR 2782745 A1 FR2782745 A1 FR 2782745A1
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France
Prior art keywords
branch
heat exchanger
valve
pass
heat
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
FR9810909A
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French (fr)
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FR2782745B1 (en
Inventor
Denis Perset
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.)
Valeo Thermique Moteur SA
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Valeo Thermique Moteur SA
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Publication date
Application filed by Valeo Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Priority to FR9810909A priority Critical patent/FR2782745B1/en
Publication of FR2782745A1 publication Critical patent/FR2782745A1/en
Application granted granted Critical
Publication of FR2782745B1 publication Critical patent/FR2782745B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/025—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from both the cooling liquid and the exhaust gases of the propulsion plant
    • 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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • 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
    • F01N2240/02—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 heat exchanger
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/18—Heater
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The exhaust system includes a heat exchanger (5) fitted downstream of the engine on a heat exchange branch (4) off the by pass branch (6) of the system. The heat exchanger is designed to operate between the exhaust gas and a cooling fluid. A single selection valve (7) is fitted into the system to allow the exhaust gas to be directed through the by pass or through the heat exchanger branch.

Description

Ligne d'échappement des gaz de moteur à combustion interne, notamment pourExhaust line for internal combustion engine gases, especially for

véhicule automobile La présente invention concerne une ligne d'échappement des gaz de moteur à combustion interne, notamment pour véhicule  motor vehicle The present invention relates to an exhaust line for internal combustion engine gases, in particular for vehicles

automobile, et plus particulièrement une telle ligne compre-  automotive, and more particularly such a line compre-

nant: - un échangeur de chaleur entre les gaz d'échappement et un fluide de refroidissement, ledit échangeur de chaleur étant disposé en aval du moteur sur une branche d'échangeur de chaleur, et - une branche de dérivation dudit échangeur, ladite branche de dérivation se raccordant à ladite branche d'échangeur de chaleur par un raccordement amont et un raccordement aval  nant: - a heat exchanger between the exhaust gases and a cooling fluid, said heat exchanger being arranged downstream of the engine on a branch of heat exchanger, and - a branch of bypass of said exchanger, said branch of bypass connecting to said heat exchanger branch by an upstream connection and a downstream connection

respectivement en amont et en aval de l'échangeur de chaleur.  respectively upstream and downstream of the heat exchanger.

On connaît des systèmes de récupération de chaleur sur les  There are known heat recovery systems on

gaz d'échappement.exhaust gas.

Le principe de fonctionnement de ces systèmes consiste, en phase de démarrage à froid, à dériver les gaz d'échappement à l'aide d'une vanne de dérivation vers un échangeur de chaleur puis sur une vanne de restriction de débit qui  The operating principle of these systems consists, in the cold start phase, in diverting the exhaust gases using a bypass valve to a heat exchanger and then on a flow restriction valve which

provoque une contre-pression à l'échappement. La contre-  causes exhaust back pressure. The counter

pression provoque une élévation de la température d'échappe-  pressure increases the exhaust temperature

ment et permet donc de récupérer davantage de chaleur dans l'échangeur. Un tel système est particulièrement utile dans les moteurs suralimentés à injection directe, dans les moteurs à essence à injection directe, ou encore dans les moteurs à essence à mélange pauvre. On constate en effet, dans tous les cas  and therefore allows more heat to be recovered in the exchanger. Such a system is particularly useful in supercharged direct injection engines, in direct injection petrol engines, or in lean-mix petrol engines. In fact, in all cases

précités, que la chaleur récupérée sur le moteur est insuffi-  mentioned above, that the heat recovered from the engine is insufficient

sante pour assurer un chauffage convenable de l'habitacle.  health to ensure adequate heating of the passenger compartment.

Ce système présente toutefois l'inconvénient de nécessiter deux vannes, à savoir une vanne de dérivation qui est placée dans la branche de dérivation, et une vanne de restriction de débit, ainsi que leurs moyens de commande. Il est donc relativement complexe et onéreux. La présente invention vise à pallier ces inconvénients, et plus particulièrement à fournir une ligne d'échappement des  However, this system has the disadvantage of requiring two valves, namely a bypass valve which is placed in the bypass branch, and a flow restriction valve, as well as their control means. It is therefore relatively complex and expensive. The present invention aims to overcome these drawbacks, and more particularly to provide an exhaust line for

gaz relativement simple.relatively simple gas.

A cet effet, l'invention a pour objet une ligne d'échappement des gaz de moteur à combustion interne, notamment pour véhicule automobile, comprenant: - un échangeur de chaleur entre les gaz d'échappement et un fluide de refroidissement, ledit échangeur de chaleur étant disposé en aval du moteur sur une branche d'échangeur de chaleur, et - une branche de dérivation dudit échangeur, ladite branche de dérivation se raccordant à ladite branche d'échangeur de chaleur par un raccordement amont et un raccordement aval respectivement en amont et en aval de l'échangeur de chaleur, et comprenant en outre une vanne de sélection unique pour sélectivement diriger les gaz d'échappement dans la branche de dérivation ou dans la branche d'échangeur de chaleur,  To this end, the subject of the invention is an exhaust line for internal combustion engine gases, in particular for a motor vehicle, comprising: - a heat exchanger between the exhaust gases and a cooling fluid, said heat exchanger heat being arranged downstream of the engine on a branch of heat exchanger, and - a branch branch of said exchanger, said branch branch connecting to said branch of heat exchanger by an upstream connection and a downstream connection respectively upstream and downstream of the heat exchanger, and further comprising a single selection valve for selectively directing the exhaust gases in the branch branch or in the heat exchanger branch,

ladite vanne étant disposée au niveau d'un desdits raccorde-  said valve being arranged at one of said connection-

ments. Par conséquent, la ligne d'échappement selon l'invention comporte une vanne de sélection unique disposée au niveau de l'un des raccordements de la ligne de dérivation à la ligne  ment. Consequently, the exhaust line according to the invention comprises a single selection valve disposed at one of the connections of the bypass line to the line.

d'échangeur de chaleur. On a pu constater qu'un tel agence-  heat exchanger. We have seen that such an agency-

ment permet d'éviter la présence de la vanne de restriction  avoids the presence of the restriction valve

de débit.of debt.

Dans un mode de réalisation particulier, la ligne d'échappe-  In a particular embodiment, the escape line

ment selon l'invention comprend des moyens de restriction  ment according to the invention comprises means of restriction

fixes sur la branche d'échangeur de chaleur.  fixed on the heat exchanger branch.

On décrira maintenant, à titre d'exemple non limitatif, deux  We will now describe, by way of nonlimiting example, two

modes de réalisation particuliers de l'invention, en réfé-  particular embodiments of the invention, with reference to

rence aux dessins schématiques annexés dans lesquels les  Refer to the accompanying schematic drawings in which the

figures 1 et 2 représentent ces deux modes de réalisation.  Figures 1 and 2 show these two embodiments.

On voit sur les figures un moteur thermique 1 à combustion interne, par exemple un moteur diesel ou essence à injection directe, équipé d'un pot d'échappement non représenté. Une ensemble de canalisations 2 relie le collecteur d'échappement  We see in the figures an internal combustion engine 1, for example a diesel or petrol engine with direct injection, equipped with an exhaust pipe not shown. A set of pipes 2 connects the exhaust manifold

du moteur 1 à l'entrée 3 du pot d'échappement.  from engine 1 to inlet 3 of the muffler.

L'ensemble de canalisations 2 est constitué d'une branche 4 sur laquelle est monté un échangeur de chaleur 5, et d'une branche de dérivation 6. L'échangeur 5 est prévu pour le refroidissement des gaz d'échappement par un fluide de refroidissement, par exemple le fluide de refroidissement du moteur 1, ce fluide étant utilisé pour le chauffage de  The set of pipes 2 consists of a branch 4 on which is mounted a heat exchanger 5, and a branch branch 6. The exchanger 5 is provided for cooling the exhaust gases with a cooling, for example the engine coolant 1, this fluid being used for heating

l'habitacle du véhicule.the passenger compartment of the vehicle.

Dans le mode de réalisation de la figure 1, une vanne de sélection 7, par exemple une vanne papillon, pilotée par tout moyen convenable permet de diriger les gaz d'échappement sélectivement vers l'échangeur 5 ou vers la branche de dérivation 6. Cette vanne 7 est ici placée au niveau du raccordement aval de la branche de dérivation 6 sur la  In the embodiment of FIG. 1, a selection valve 7, for example a butterfly valve, controlled by any suitable means makes it possible to direct the exhaust gases selectively to the exchanger 5 or to the branch branch 6. This valve 7 is here placed at the level of the downstream connection of the branch branch 6 on the

branche d'échangeur de chaleur 4.heat exchanger branch 4.

Dans le mode de réalisation de la figure 2, la vanne de sélection 7' est placée au niveau du raccordement amont de la branche 6 sur la branche 4. Sa fonction est la même que la  In the embodiment of FIG. 2, the selection valve 7 ′ is placed at the level of the upstream connection of the branch 6 on the branch 4. Its function is the same as the

vanne 7 de la figure 1.valve 7 of figure 1.

A la figure 1, la vanne 7 est représentée dans la position o elle ferme la branche de dérivation 6. La ligne d'échappement est dans sa configuration de démarrage à froid, les gaz  In Figure 1, the valve 7 is shown in the position where it closes the branch branch 6. The exhaust line is in its cold start configuration, the gases

d'échappement passant dans l'échangeur 5.  exhaust passing through the exchanger 5.

La chaleur ainsi récupérée permet, par l'intermédiaire du fluide de refroidissement de l'échangeur de chaleur, dans un premier temps d'accélérer la mise en température du moteur,  The heat thus recovered makes it possible, firstly through the coolant of the heat exchanger, to accelerate the warming up of the engine,

puis de chauffer l'habitacle.then heat the passenger compartment.

Au contraire, à la figure 2, la vanne 7' est représentée dans la position o elle ouvre la branche de dérivation 6, en mode de fonctionnement normal du moteur. Les gaz d'échappement  In contrast, in Figure 2, the valve 7 'is shown in the position where it opens the branch branch 6, in normal engine operating mode. The exhaust gas

sont transférés directement vers le pot d'échappement.  are transferred directly to the exhaust.

On observera à la figure 2 qu'une restriction fixe de débit 8 est prévue sur la branche 4 en aval de l'échangeur de chaleur 5. Cette restriction a pour effet, lorsque les gaz d'échappement empruntent la branche 4 de l'échangeur de chaleur, de créer une contre-pression. Cette dernière provoque un échauffement des gaz et donc un fonctionnement amélioré de l'échangeur. Bien entendu, une telle restriction pourrait également être prévue dans le mode de réalisation de  It will be observed in Figure 2 that a fixed flow restriction 8 is provided on the branch 4 downstream of the heat exchanger 5. This restriction has the effect, when the exhaust gases pass through the branch 4 of the exchanger of heat, to create a back pressure. The latter causes heating of the gases and therefore improved operation of the exchanger. Of course, such a restriction could also be provided in the embodiment of

la figure 1.Figure 1.

Claims (4)

RevendicationsClaims 1 - Ligne d'échappement des gaz de moteur à combustion interne (1), notamment pour véhicule automobile, comprenant: - un échangeur de chaleur (5) entre les gaz d'échappement et un fluide de refroidissement, ledit échangeur de chaleur  1 - Exhaust line for internal combustion engine gases (1), in particular for a motor vehicle, comprising: - a heat exchanger (5) between the exhaust gases and a cooling fluid, said heat exchanger étant disposé en aval du moteur sur une branche (4) d'échan-  being arranged downstream of the engine on a branch (4) of exchanger geur de chaleur, et - une branche de dérivation (6) dudit échangeur, ladite  heat gor, and - a branch branch (6) of said exchanger, said branche de dérivation se raccordant à ladite branche d'échan-  branch branch connecting to said branch branch geur de chaleur par un raccordement amont et un raccordement aval respectivement en amont et en aval de l'échangeur de chaleur, caractérisée par le fait qu'elle comprend une vanne de sélection unique (7; 7') pour sélectivement diriger les gaz d'échappement dans la branche de dérivation (6) ou dans la branche (4) d'échangeur de chaleur, ladite vanne étant  heat sink by an upstream connection and a downstream connection respectively upstream and downstream of the heat exchanger, characterized in that it comprises a single selection valve (7; 7 ') for selectively directing the gases of exhaust in the branch branch (6) or in the branch (4) of heat exchanger, said valve being disposée au niveau d'un desdits raccordements.  disposed at one of said connections. 2 - Ligne d'échappement selon la revendication 1, dans laquelle ladite vanne (7; 7') est disposée au niveau du  2 - exhaust line according to claim 1, wherein said valve (7; 7 ') is arranged at the raccordement amont.upstream connection. 3 - Ligne d'échappement selon la revendication 1, dans laquelle ladite vanne (7; 7') est disposée au niveau du  3 - exhaust line according to claim 1, wherein said valve (7; 7 ') is disposed at the raccordement aval.downstream connection. 4 - Ligne d'échappement selon l'une quelconque des revendica-  4 - Exhaust line according to any one of the claims tions 1 à 3, comprenant des moyens de restriction fixes (8)  1 to 3, including fixed restriction means (8) sur la branche (4) d'échangeur de chaleur.  on the branch (4) of heat exchanger.
FR9810909A 1998-09-01 1998-09-01 INTERNAL COMBUSTION ENGINE GAS EXHAUST LINE, ESPECIALLY FOR MOTOR VEHICLE Expired - Fee Related FR2782745B1 (en)

Priority Applications (1)

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FR9810909A FR2782745B1 (en) 1998-09-01 1998-09-01 INTERNAL COMBUSTION ENGINE GAS EXHAUST LINE, ESPECIALLY FOR MOTOR VEHICLE

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FR9810909A FR2782745B1 (en) 1998-09-01 1998-09-01 INTERNAL COMBUSTION ENGINE GAS EXHAUST LINE, ESPECIALLY FOR MOTOR VEHICLE

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101265829B (en) * 2007-03-17 2011-03-23 浪达科技（深圳）有限公司 Heat exchanger utilizing diesel tail gas thermal quantity and its valve control method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598512A (en) * 1982-07-06 1984-01-17 Mazda Motor Corp Room heating device of car mounted with water-cooled engine
GB2301177A (en) * 1995-05-18 1996-11-27 Mechadyne Ltd Exhaust gas heat exchanger in an internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598512A (en) * 1982-07-06 1984-01-17 Mazda Motor Corp Room heating device of car mounted with water-cooled engine
GB2301177A (en) * 1995-05-18 1996-11-27 Mechadyne Ltd Exhaust gas heat exchanger in an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 094 (M - 293) 28 April 1984 (1984-04-28) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101265829B (en) * 2007-03-17 2011-03-23 浪达科技（深圳）有限公司 Heat exchanger utilizing diesel tail gas thermal quantity and its valve control method

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Publication number Publication date
FR2782745B1 (en) 2001-11-16

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