FR2861812A1 - Diesel engine arrangement for use in motor vehicle, has hydraulic circuit for controlling opening of valve towards cooler placed on recirculation duct, based on temperature of re-circulated exhaust gas - Google Patents

Diesel engine arrangement for use in motor vehicle, has hydraulic circuit for controlling opening of valve towards cooler placed on recirculation duct, based on temperature of re-circulated exhaust gas Download PDF

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Publication number
FR2861812A1
FR2861812A1 FR0350761A FR0350761A FR2861812A1 FR 2861812 A1 FR2861812 A1 FR 2861812A1 FR 0350761 A FR0350761 A FR 0350761A FR 0350761 A FR0350761 A FR 0350761A FR 2861812 A1 FR2861812 A1 FR 2861812A1
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Prior art keywords
exhaust gas
recirculation
temperature
duct
valve
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Granted
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FR0350761A
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French (fr)
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FR2861812B1 (en
Inventor
Jacky Guezet
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Renault SAS
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Renault SAS
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Priority to FR0350761A priority Critical patent/FR2861812B1/en
Publication of FR2861812A1 publication Critical patent/FR2861812A1/en
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Publication of FR2861812B1 publication Critical patent/FR2861812B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0425—Air cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D2041/0067—Determining the EGR temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases

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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 Circulating Devices (AREA)

Abstract

The arrangement has a recirculation duct (15) for recirculation of exhaust gas between inlet and exhaust ducts (17, 16). A cooler (2) is placed on duct (15) to cool the re-circulated exhaust gas, and a temperature sensor (10) is placed downstream of the cooler to measure temperature of re-circulated gas. A hydraulic circuit (12) controls an opening of a valve (9) towards the cooler based on the temperature measured by the sensor.

Description

AGENCEMENT DE MOTEUR COMPRENANT UNE RECIRCULATION DESMOTOR ARRANGEMENT COMPRISING A RECIRCULATION OF

GAZ D'ECHAPPEMENTEXHAUST GAS

DESCRIPTIONDESCRIPTION

Le sujet de cette invention est un agencement de moteur comprenant un conduit de recirculation des gaz d'échappement (souvent désigné par EGR d'après l'anglais).  The subject of this invention is an engine arrangement including an exhaust gas recirculation conduit (often referred to as EGR from English).

De nombreux moteurs tels que les moteurs diesels suralimentés d'automobile comprennent un conduit de recirculation des gaz d'échappement par lequel une portion du débit des gaz d'échappement retourne au moteur peu après avoir été produite par celui-ci. Le mélange arrivant au moteur est ainsi porté à une température plus élevée. Un avantage de ce procédé est que les polluants NOx (d'oxyde d'azote) sont réduits de façon significative. Un ajustement de la quantité des gaz soumise à cette recirculation est cependant nécessaire selon les régimes du moteur. Le conduit de recirculation est donc muni d'une vanne à ouverture progressive commandée automatiquement.  Many engines such as automotive supercharged diesel engines include an exhaust gas recirculation conduit through which a portion of the exhaust gas flow returns to the engine shortly after being produced therefrom. The mixture arriving at the engine is thus raised to a higher temperature. An advantage of this process is that NOx pollutants (nitrogen oxide) are significantly reduced. An adjustment of the amount of gas subjected to this recirculation is however necessary according to the engine speeds. The recirculation duct is therefore equipped with a progressive opening valve controlled automatically.

Un autre paramètre influençant grandement les émissions de polluants est la température des gaz de recirculation. Il est souvent avantageux de les refroidir par un système à échangeur de chaleur relié à un radiateur. Le brevet EP 1 091 113 décrit un tel dispositif, et même à deux exemplaires juxtaposés dans un mode de réalisation. Mais les performances du système de refroidissement sont irrégulières, dépendant B 14452/JCI des conditions de route, et ne permettent donc pas de tirer le meilleur parti de la recirculation.  Another parameter that greatly influences pollutant emissions is the temperature of the recirculating gases. It is often advantageous to cool them by a heat exchanger system connected to a radiator. Patent EP 1 091 113 describes such a device, and even two copies juxtaposed in one embodiment. But the performance of the cooling system is irregular, dependent on road conditions, and therefore does not make the most of recirculation.

Il est donc proposé ici de remédier à cette lacune de la technique connue. La solution exposée consiste à régler le refroidissement d'après une température atteinte par les gaz en recirculation refroidis et qu'on mesure. L'invention consiste ainsi en un agencement de moteur d'automobile comprenant un conduit de recirculation de gaz d'échappement entre un conduit d'admission et un conduit d'échappement menant au moteur, une vanne sur le conduit de recirculation de gaz d'échappement et un dispositif de réglage de la vanne, caractérisé en ce qu'il comprend un capteur de température placé sur le conduit de gaz d'échappement pour commander le dispositif de réglage, et une dérivation se branchant sur le conduit de gaz d'échappement autour de la vanne.  It is therefore proposed here to remedy this gap in the known art. The solution exposed consists of adjusting the cooling according to a temperature reached by the recirculating gases cooled and measured. The invention thus consists of an automobile engine arrangement comprising an exhaust gas recirculation duct between an intake duct and an exhaust duct leading to the engine, a valve on the gas recirculation duct. exhaust and a valve adjusting device, characterized in that it comprises a temperature sensor placed on the exhaust gas duct for controlling the control device, and a bypass connecting to the exhaust gas duct around the valve.

Il est avantageux que le circuit de refroidissement comprenne une branche de contournement de l'échangeur de chaleur, la vanne soit située à un embranchement d'entrée dans ladite branche de contournement, et ladite branche de contournement passe sur le moteur: il coïncide en réalité avec le circuit habituel de refroidissement du moteur et comprend simplement l'échangeur débit d'eau obtenu si 30 dérivation comprenant B 14452/JCIsupplémentaire passant par par laquelle une portion du est une et une vanne commandée par le moyen une branche de chaleur et est soutirée.  It is advantageous that the cooling circuit comprises a bypass branch of the heat exchanger, the valve is located at an inlet branch in said bypass branch, and said bypass branch passes on the engine: it coincides in reality with the usual engine cooling circuit and simply includes the water flow exchanger obtained if bypass comprising additional B 14452 / JCI passing through which a portion of is a and a valve controlled by the means a heat branch and is withdrawn .

Un perfectionnement à l'asservissement le conduit de recirculation comprend contournant l'échangeur de chaleur d'asservissement, en adoptant le mode d'asservissement détaillé plus loin.  An improvement to servo control the recirculation duct comprises bypassing the servo heat exchanger, adopting the servo mode detailed below.

L'invention sera maintenant décrite au moyen de la figure. Elle représente le schéma d'un moteur 7 suralimenté muni d'un système de recirculation des gaz brûlés EGR. Une partie des gaz d'échappement, sortant du moteur 7, est dirigée vers un refroidisseur 2 à l'aide d'une vanne de recirculation 6, le reste des gaz allant à la turbine 1. La turbine 1 est reliée à un compresseur 5 qui comprime l'air d'admission, celui-ci étant ensuite refroidi dans un radiateur 4 avant d'être mélangé avec les gaz de recirculation et réintroduit dans le moteur 7. Pour cela, un conduit de recirculation 15 relie un conduit d'échappement 16 à un conduit d'admission 17; le refroidisseur 2 est placé sur le conduit de recirculation 15, la turbine 1 sur le conduit d'échappement 16 et le compresseur 5 et le radiateur 4 sur le conduit d'admission 17; la vanne de recirculation 6 est enfin placée à la jonction des conduits de recirculation et d'échappement 16.  The invention will now be described by means of the figure. It represents the diagram of a supercharged engine 7 equipped with an EGR gas recirculation system. Part of the exhaust gas, leaving the engine 7, is directed to a cooler 2 using a recirculation valve 6, the rest of the gas going to the turbine 1. The turbine 1 is connected to a compressor 5 which compresses the intake air, which is then cooled in a radiator 4 before being mixed with the recirculation gases and reintroduced into the engine 7. For this, a recirculation duct 15 connects an exhaust duct 16 to an intake duct 17; the cooler 2 is placed on the recirculation duct 15, the turbine 1 on the exhaust duct 16 and the compressor 5 and the radiator 4 on the intake duct 17; the recirculation valve 6 is finally placed at the junction of the recirculation and exhaust ducts 16.

La température des gaz de recirculation est abaissée grâce à une circulation d'eau dans un circuit hydraulique 12 passant par le refroidisseur 2, qui forme un échangeur de chaleur avec le conduit de recirculation 15, et par un second radiateur 3 situé près du précédent et soumis comme lui à une ventilation d'air frais quand le véhicule se déplace. Un thermocouple 10 est situé sur le conduit de recirculation 15 à la sortie du refroidisseur 2 et mesure la température des gaz de recirculation parvenant au moteur 7; il envoie cette information à B 14452/JCI un calculateur 11 qui agit sur une vanne 9 afin de régler la proportion de l'eau du circuit hydraulique 12 qui passe par le refroidisseur 2, le reste circulant dans une branche 18 affectée au refroidissement du moteur 7. Une pompe 8 assure la circulation de l'eau de refroidissement.  The temperature of the recirculation gases is lowered by means of a circulation of water in a hydraulic circuit 12 passing through the cooler 2, which forms a heat exchanger with the recirculation duct 15, and by a second radiator 3 located near the previous one and like him to a ventilation of fresh air when the vehicle moves. A thermocouple 10 is located on the recirculation duct 15 at the outlet of the cooler 2 and measures the temperature of the recirculation gases reaching the engine 7; it sends this information to B 14452 / JCI a calculator 11 which acts on a valve 9 in order to adjust the proportion of the water of the hydraulic circuit 12 which passes through the cooler 2, the rest flowing in a branch 18 assigned to the cooling of the engine 7. A pump 8 circulates the cooling water.

Le conduit de recirculation 15 comprend encore un volet 13 à l'entrée d'une dérivation 14 contournant le refroidisseur 2.  The recirculation duct 15 further comprises a shutter 13 at the inlet of a bypass 14 bypassing the cooler 2.

Une carte lla de pilotage de la vanne 9 d'ajustement du débit d'eau du refroidisseur 2 est déterminée pour différents points de fonctionnement du moteur 7, selon le régime et le couple; ainsi, pour chaque état du moteur 7, le débit d'eau parvenant au refroidisseur 2 est réglé afin d'obtenir une température déterminée des gaz d'échappement en recirculation. Cette température est choisie pour obtenir le meilleur compromis entre les débits des différents polluants. Cet asservissement en boucle ouverte, susceptible de dériver rapidement, doit être complété pour donner une boucle fermée. Le thermocouple 10 mesurant la température des gaz de recirculation à la sortie de refroidisseur 2 et la transmettant au calculateur 11 permet une comparaison de cette température à une consigne de température fixée dans une seconde carte lib qui pourra consister en un régulateur de type PID. La valeur de consigne d'état de la vanne 9 fournie par la carte lia est alors corrigée d'une valeur proportionnelle à la différence entre la température mesurée et la consigne de température. Cet asservissement du débit d'eau passant par le B 14452/JCI refroidisseur 2 permet de s'approcher de moins d'un degré Celsius de la valeur de consigne.  A control card 11a of the valve 9 for adjusting the water flow of the cooler 2 is determined for different operating points of the engine 7, according to the speed and torque; thus, for each state of the engine 7, the flow of water to the cooler 2 is adjusted to obtain a determined temperature of the exhaust gas recirculation. This temperature is chosen to obtain the best compromise between the flow rates of the different pollutants. This enslavement in open loop, which can drift quickly, must be completed to give a closed loop. The thermocouple 10 measuring the temperature of the recirculation gas at the outlet of the cooler 2 and transmitting it to the computer 11 allows a comparison of this temperature with a set temperature setpoint in a second card lib which may consist of a PID type regulator. The state setpoint value of the valve 9 supplied by the card 11a is then corrected by a value proportional to the difference between the measured temperature and the temperature setpoint. This servocontrol of the flow of water passing through the B 14452 / JCI cooler 2 makes it possible to approach less than a degree Celsius of the set value.

Le refroidisseur 2 sera surdimensionné afin de respecter les consignes les plus faibles de la température des gaz de recirculation. Si toutefois la température des gaz de recirculation est plus faible que la température de consigne alors que le débit d'eau passant au travers du refroidisseur de 2 est minimal, il est possible d'éviter celui-ci à l'aide du volet 13, que le calculateur 11 commande aussi. Les gaz de recirculation ne sont alors plus refroidis, le système fonctionne en boucle ouverte. Lorsque la température des gaz de recirculation devient à nouveau plus forte que celle de consigne, le volet 13 se ferme et le système de refroidissement fonctionne à nouveau en boucle fermée.  Cooler 2 will be oversized to meet the lowest set of recirculation gas temperatures. If, however, the temperature of the recirculation gases is lower than the set temperature while the flow of water passing through the cooler of 2 is minimal, it is possible to avoid this by means of the flap 13, that the computer 11 also controls. The recirculation gases are no longer cooled, the system operates in open loop. When the temperature of the recirculation gas becomes again higher than that of setpoint, the shutter 13 closes and the cooling system operates again in a closed loop.

B 14452/JCIB 14452 / JCI

Claims (3)

REVENDICATIONS 1) Agencement de moteur (7) d'automobile comprenant un conduit de recirculation (15) de gaz d'échappement entre un conduit d'admission (17) et un conduit d'échappement (16) menant au moteur, un échangeur de chaleur (2) des gaz d'échappement en recirculation qui est disposé sur le conduit de recirculation, et un circuit de refroidissement alimentant l'échangeur de chaleur, caractérisé en ce qu'il comprend un capteur de température (10) des gaz d'échappement en recirculation, qui est disposé dans le conduit de recirculation (15) en aval de l'échangeur de chaleur (2), une vanne (9) sur le circuit de refroidissement, et un moyen (12) d'asservissement de la vanne relié au capteur de température (10) et ajusté pour régler un degré d'ouverture de la vanne vers l'échangeur de chaleur (2) en fonction d'une température mesurée par le capteur.  1) Automobile engine arrangement (7) comprising an exhaust gas recirculation duct (15) between an intake duct (17) and an exhaust duct (16) leading to the engine, a heat exchanger (2) recirculating exhaust gas which is arranged on the recirculation duct, and a cooling circuit supplying the heat exchanger, characterized in that it comprises a temperature sensor (10) of the exhaust gas in recirculation, which is arranged in the recirculation duct (15) downstream of the heat exchanger (2), a valve (9) on the cooling circuit, and a means (12) for controlling the connected valve to the temperature sensor (10) and adjusted to set a degree of opening of the valve to the heat exchanger (2) as a function of a temperature measured by the sensor. 2) Agencement selon la revendication 1, caractérisé en ce que le circuit de refroidissement comprend une branche (18) de contournement de l'échangeur de chaleur, la vanne (9) est située à un embranchement d'entrée dans ladite branche de contournement, et ladite branche de contournement passe sur le moteur (7).  2) Arrangement according to claim 1, characterized in that the cooling circuit comprises a branch (18) bypassing the heat exchanger, the valve (9) is located at an inlet branch in said branch bypass, and said bypass branch passes over the engine (7). 3) Agencement selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le conduit de recirculation (15) comprend une dérivation (14) contournant l'échangeur de chaleur (2) et comprenant une vanne commandée par le moyen d'asservissement (11).  3) Arrangement according to any one of claims 1 or 2, characterized in that the recirculation duct (15) comprises a bypass (14) bypassing the heat exchanger (2) and comprising a valve controlled by the means of servo (11). B 14452/JCIB 14452 / JCI
FR0350761A 2003-10-31 2003-10-31 MOTOR ARRANGEMENT COMPRISING EXHAUST GAS RECIRCULATION Expired - Lifetime FR2861812B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2897676A1 (en) * 2006-02-20 2007-08-24 Peugeot Citroen Automobiles Sa Radiator type heat exchanger for internal combustion engine of vehicle, has inlet and outlet nozzles arranged to increase cooling of fluid from one of heat exchange loops during passage of fluid in exchanger
DE102010055072A1 (en) * 2010-12-18 2012-06-21 Volkswagen Ag Cooling circuit for an internal combustion engine with an exhaust gas recirculation and method for operating an internal combustion engine with such a cooling circuit
CN110131018A (en) * 2019-07-03 2019-08-16 广西玉柴机器股份有限公司 Water cooling exhaust system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1091113A2 (en) 1999-10-07 2001-04-11 Cummins Engine Company, Inc. High-temperature coolant loop for cooled exhaust gas recirculation for internal combustion engines
EP1170498A1 (en) * 2000-07-06 2002-01-09 Peugeot Citroen Automobiles SA Device for thermal control of the intake air of an internal combustion engine of an automotive vehicle
FR2835884A1 (en) * 2002-02-12 2003-08-15 Valeo Thermique Moteur Sa METHOD FOR CONTROLLING THE TEMPERATURE OF GASES ALLOWED IN A MOTOR VEHICLE ENGINE, EXCHANGER AND DEVICE FOR MANAGING THE TEMPERATURE OF SUCH GASES
FR2847004A1 (en) * 2002-11-12 2004-05-14 Peugeot Citroen Automobiles Sa Temperature regulation for engine intake air and recirculated exhaust gas, uses single unit housing two heat exchangers to exchange heat between exhaust gas, fluid and intake air, with control of fluid flow

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1091113A2 (en) 1999-10-07 2001-04-11 Cummins Engine Company, Inc. High-temperature coolant loop for cooled exhaust gas recirculation for internal combustion engines
EP1170498A1 (en) * 2000-07-06 2002-01-09 Peugeot Citroen Automobiles SA Device for thermal control of the intake air of an internal combustion engine of an automotive vehicle
FR2835884A1 (en) * 2002-02-12 2003-08-15 Valeo Thermique Moteur Sa METHOD FOR CONTROLLING THE TEMPERATURE OF GASES ALLOWED IN A MOTOR VEHICLE ENGINE, EXCHANGER AND DEVICE FOR MANAGING THE TEMPERATURE OF SUCH GASES
FR2847004A1 (en) * 2002-11-12 2004-05-14 Peugeot Citroen Automobiles Sa Temperature regulation for engine intake air and recirculated exhaust gas, uses single unit housing two heat exchangers to exchange heat between exhaust gas, fluid and intake air, with control of fluid flow

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2897676A1 (en) * 2006-02-20 2007-08-24 Peugeot Citroen Automobiles Sa Radiator type heat exchanger for internal combustion engine of vehicle, has inlet and outlet nozzles arranged to increase cooling of fluid from one of heat exchange loops during passage of fluid in exchanger
DE102010055072A1 (en) * 2010-12-18 2012-06-21 Volkswagen Ag Cooling circuit for an internal combustion engine with an exhaust gas recirculation and method for operating an internal combustion engine with such a cooling circuit
CN110131018A (en) * 2019-07-03 2019-08-16 广西玉柴机器股份有限公司 Water cooling exhaust system

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