EP1055813A2 - Liquid cooled combustion engine with an exhaust gas recirculation system - Google Patents

Liquid cooled combustion engine with an exhaust gas recirculation system Download PDF

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Publication number
EP1055813A2
EP1055813A2 EP00109834A EP00109834A EP1055813A2 EP 1055813 A2 EP1055813 A2 EP 1055813A2 EP 00109834 A EP00109834 A EP 00109834A EP 00109834 A EP00109834 A EP 00109834A EP 1055813 A2 EP1055813 A2 EP 1055813A2
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EP
European Patent Office
Prior art keywords
exhaust gas
combustion engine
internal combustion
heat exchanger
controlled
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
EP00109834A
Other languages
German (de)
French (fr)
Other versions
EP1055813A3 (en
EP1055813B1 (en
Inventor
Henryk Bednarek
Hariolf Dr. Gentner
Werner Lugs
Markus Kutscha
Wolfgang Kuttler
Peter Dr. Nefischer
Ewald Riemeyer
Wolfgang Seiler
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Publication of EP1055813A2 publication Critical patent/EP1055813A2/en
Publication of EP1055813A3 publication Critical patent/EP1055813A3/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
    • 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
    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves
    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/143—Controlling of coolant flow the coolant being liquid using restrictions
    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • 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
    • F01P2060/02—Intercooler
    • 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
    • F01P2060/08—Cabin heater
    • 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
    • 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
    • F02B29/045—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly
    • F02B29/0475—Constructional details of the heat exchangers, e.g. pipes, plates, ribs, insulation, materials, or manufacturing and assembly the intake air cooler being combined with another device, e.g. heater, valve, compressor, filter or EGR cooler, or being assembled on a special engine location
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • 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
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages

Definitions

  • the invention relates to a Liquid-cooled internal combustion engine with an exhaust gas recirculation system, the one with a coolant circulation controlled by a thermostat and a map-controlled Internal combustion engine connected on the inflow and outflow sides for cooling the recirculated into the machine intake air controlled by an EGR valve
  • Exhaust gas comprises, the heat exchanger on the inflow or outflow side a throttle thermostat is controlled.
  • Such an exhaust gas heat exchanger for an exhaust gas recirculation system of a liquid-cooled Internal combustion engine is for example from DE 28 42 653 A1 known, which serves to cool the recirculated exhaust gas.
  • DE 28 32 571 C is an exhaust gas coolant heat exchanger for one Internal combustion engine known in the warm-up phase of the internal combustion engine is used to heat the coolant so as to shorten the warm-up phase. Furthermore, the thermal energy supplied to the coolant in this operating phase can at low outside temperatures also for heating the passenger compartment as well as for windshield defrosting. A cooling the exhaust gas recirculated into the machine intake air is known in this Arrangement not provided.
  • the invention has for its object in a generic internal combustion engine using an EGR heat exchanger with little effort in use the heat present in the exhaust gas in a certain operating range.
  • the EGR heat exchanger for the use of exhaust gas heat can be operated in a controlled manner
  • Exhaust gas recirculation line downstream of the EGR valve a first switch for connection with a machine exhaust pipe and in an inlet or outlet pipe of the EGR heat exchanger in a bypass line bypassing its throttle thermostats a second switch for coolant circulation are provided, the EGR valve as well as the two switches for exhaust gas heat recirculation into the coolant circulation Map-controlled are on a free, respective medium passage.
  • the invention is particularly advantageous with a given EGR heat exchanger to realize in a simple manner for an advantageous rapid heating of the coolant the internal combustion engine after a cold start.
  • the EGR heat exchanger upstream of the thermostat of the internal combustion engine with the coolant circulation on the inlet side communicates.
  • the EGR heat exchanger in the warm-up phase of the internal combustion engine after a cold start warming coolant supplied, which in turn heats up by the exhaust gas is.
  • This arrangement allows this in a further advantageous manner by using the Exhaust gas heat cools the coolant more quickly into the internal or short circuit feed the internal combustion engine.
  • the EGR heat exchanger with exhaust gas heat recirculation controlled upstream of the Thermostats of the internal combustion engine with the coolant circulation and subsequent Exhaust gas cooling controlled on the inlet side downstream of a cooler Internal combustion engine can be connected to the coolant circulation.
  • This configuration can be used in an exhaust gas recirculation mode following the warm-up phase in partial load mode the EGR heat exchanger is charged with relatively cool coolant become.
  • the first Switch as exhaust switch and the second switch as coolant switch each as a control valve device are designed.
  • the invention is based on a coolant circuit shown schematically in the drawing a liquid-cooled internal combustion engine with an exhaust gas recirculation system described.
  • a liquid-cooled, map-controlled internal combustion engine 1 with an exhaust gas recirculation system 2 comprises one controlled by a thermostat 3 Coolant circulation connected to the EGR heat exchanger on the inlet and outlet side 5 for cooling the controlled in the machine intake air 7 via an EGR valve 6 recirculated exhaust gas, the EGR heat exchanger 5 on the discharge side via a Throttle thermostat 8 is controlled.
  • the EGR heat exchanger 5 is upstream of the Thermostats 3 of the internal combustion engine 1 with the coolant circulation 4 on the inlet side Connection with which coolant heated on the machine side to the EGR heat exchanger 5 is supplied, the temperature of which is further increased by using the exhaust gas heat is.
  • the internal combustion engine 1 can be further equipped so that with exhaust gas cooling the EGR heat exchanger 5 on the inlet side - not shown - is controlled downstream of one Radiator 15 of the internal combustion engine 1 can be connected to the coolant circulation 4.
  • the first switch 10 as an exhaust switch and the second switch 14 as a coolant switch each designed as a control flap device, each controlled by a map are operated.
  • Exhaust gas turbocharger 18 arranged in the engine exhaust line 11 is essential here that the throttled connection 16 downstream of the turbine of the exhaust gas turbocharger 18 opens into the machine exhaust pipe 11.
  • the EGR heat exchanger 5 on the discharge side with a return line 19 one with the Coolant circulation 4 of the internal combustion engine 1 controlled connectable vehicle and / or Air conditioning unit 20 in connection, with the heating return line 19 downstream of the thermostat 3 of the internal combustion engine 1 upstream of an inlet a water pump 21 opens.
  • the EGR heat exchanger 5 can be equipped with a separate, water-cooled one Charge air cooler (not shown) can be structurally combined.

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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)
  • Exhaust Silencers (AREA)

Abstract

The engine has an exhaust gas feedback heat exchanger (5) connected to the feed or return sides of a cooling medium circuit controlled by a thermostat for cooling the exhaust gas fed back into the induction air (7) via a valve (6). The heat exchanger i controlled on the feed or return side by a choke-thermostat (8). The heat exchanger is controlled to use exhaust gas heat. A fir branching device (10) downstream of the valve is connected to an engine exhaust gas line (11). A second branching device (14) to coolant circuit is arranged in the heat exchanger's feed or return line. The valve and the two branching devices are controlled a characteristic field to provide free passage for exhaust gas feedback.

Description

Die Erfindung bezieht sich nach dem Oberbegriff des Patentanspruches 1 auf eine flüssigkeitsgekühlte Brennkraftmaschine mit einem Abgasrückführsystem, das einen mit einem mittels eines Thermostaten gesteuerten Kühlmittelumlauf einer kennfeldgesteuerten Brennkraftmaschine zu- und abflußseitig verbundenen Wärmetauscher zur Kühlung des über ein AGR-Ventil gesteuert in die Maschinen-Ansaugluft rückgeführten Abgases umfaßt, wobei der Wärmetauscher zu- oder abflußseitig über einen Drossel-Thermostaten gesteuert ist.According to the preamble of claim 1, the invention relates to a Liquid-cooled internal combustion engine with an exhaust gas recirculation system, the one with a coolant circulation controlled by a thermostat and a map-controlled Internal combustion engine connected on the inflow and outflow sides for cooling the recirculated into the machine intake air controlled by an EGR valve Exhaust gas comprises, the heat exchanger on the inflow or outflow side a throttle thermostat is controlled.

Ein derartiger Abgas-Wärmetauscher für ein Abgasrückführsystem einer flüssigkeitsgekühlten Brennkraftmaschine ist beispielsweise aus der DE 28 42 653 A1 bekannt, der der Kühlung des rückgeführten Abgases dient.Such an exhaust gas heat exchanger for an exhaust gas recirculation system of a liquid-cooled Internal combustion engine is for example from DE 28 42 653 A1 known, which serves to cool the recirculated exhaust gas.

Weiter ist aus der DE 28 32 571 C ein Abgas-Kühlmittel-Wärmetauscher für eine Brennkraftmaschine bekannt, der in der Warmlaufphase der Brennkraftmaschine zum Aufheizen des Kühlmittels benutzt wird, um so die Warmlaufphase zu verkürzen. Weiter kann die dem Kühlmittel in dieser Betriebsphase zugeführte Wärmeenergie bei niedrigen Außentemperaturen außerdem zum Heizen des Fahrgastraumes sowie zur Windschutzscheiben-Enteisung genutzt werden. Eine Kühlung des in die Maschinen-Ansaugluft rückgeführten Abgases ist bei dieser bekannten Anordnung nicht vorgesehen.Furthermore, from DE 28 32 571 C is an exhaust gas coolant heat exchanger for one Internal combustion engine known in the warm-up phase of the internal combustion engine is used to heat the coolant so as to shorten the warm-up phase. Furthermore, the thermal energy supplied to the coolant in this operating phase can at low outside temperatures also for heating the passenger compartment as well as for windshield defrosting. A cooling the exhaust gas recirculated into the machine intake air is known in this Arrangement not provided.

Weiter ist aus der DE 25 53 174 A eine flüssigkeitsgekühlte Brennkraftmaschine zum Antrieb von Fahrzeugen bekannt, die einen zusätzlichen, vom Abgas durchströmten Wärmetauscher umfaßt, der sowohl mit dem Leitungskreislauf der Maschinenkühlung als auch mit einer Fahrzeug-Heizvorrichtung in Verbindung steht. Damit kann die Heizvorrichtung nach dem Anlassen der Brennkraftmaschine insbesondere bei tiefen Außentemperaturen und noch kalter Brennkraftmaschine relativ rasch wirksamer werden, wobei ferner über die Verbindung mit der Maschinenkühlung auch die Warmlaufphase der Brennkraftmaschine wesentlich verkürzt ist. Auch bei dieser bekannten Vorrichtung ist eine Abkühlung des rückgeführten Abgases nicht vorgesehen.Furthermore, from DE 25 53 174 A is a liquid-cooled internal combustion engine Known for driving vehicles that have an additional, flowed through by the exhaust gas Includes heat exchanger, both with the line circuit of the Machine cooling as well as with a vehicle heater. This allows the heating device in particular after starting the internal combustion engine at low outside temperatures and still cold internal combustion engine relative quickly become more effective, further via the connection with the machine cooling the warm-up phase of the internal combustion engine is significantly shortened. Also in this known device is a cooling of the recirculated exhaust gas not provided.

Dies trifft auch zu für die aus der DE 197 26 217 A1 bekannte Vorrichtung mit einem im Hauptstrom des Abgases einer flüssigkeitsgekühlten Brennkraftmaschine angeordneten Wärmetauscher, der insbesondere neben einer Verkürzung der Warmlaufphase auch einer früh wirksamen Fahrzeug-Heizung dient.This also applies to the device with a known from DE 197 26 217 A1 arranged in the main stream of the exhaust gas of a liquid-cooled internal combustion engine Heat exchanger, in particular in addition to shortening the warm-up phase also serves an early effective vehicle heating.

Wie aus dem vorbeschriebenen Stand der Technik erkennbar, ist mit der Übertragung von Abgaswärme an das Kühlwasser ein erheblicher Bauaufwand verbunden. Mit der Anordnung eines Abgas-/Wasser-Wärmetauschers zur Kühlung von in die Maschinen-Ansaugluft rückgeführtem Abgas sind Funktionsnachteile verbunden, die sowohl die Dimensionierung als auch die Anordnung des AGR-Kühlers innerhalb des Kühlmittelumlaufes der Brennkraftmaschine betreffen. So ist innerhalb des AGR-Bereiches der Kühlmitteldurchsatz durch den AGR-Kühler mittels eines Thermostaten zu drosseln, da bei zu starker Abkühlung der AGR-Menge die Vorteile der NOx-Absenkung durch Anstiege der HC-Emissionen teilweise kompensiert werden. Außerhalb des AGR-Bereiches bei geschlossener Abgasrückführleitung in die Maschinen-Ansaugluft muß die durch Gaspulsation anfallende, insbesondere im Vollastbereich größenordnungsmäßig über der eigentlichen AGR-Wärmemenge liegende Abgaswärme abgeführt werden, um örtliches Sieden im AGR-Kühler bzw. Wärmetauscher zu vermeiden. Dies bedingt eine deutlich über die Erfordernisse der reinen AGR-Kühlfunktion hinausgehende Kühlerdimensionierung. Wird schließlich der Zulauf des AGR-Kühlers bzw. Wärmetauschers an den Rücklauf des Wasserkühlers der Brennkraftmaschine angeschlossen, um zur Erzielung einer guten Kühlwirkung den AGR-Wärmetauscher mit möglichst kaltem Wasser anspeisen zu können, so ergibt dies bei geschlossenem Thermostaten der Brennkraftmaschine, also in einem Betriebsbereich, in dem eine rasche Erwärmung der Brennkraftmaschine erwünscht bzw. zusätzlich auch Heizbedarf erwartet ist, daß der AGR-Wärmetauscher bzw. Kühler seine Wärme an den externen Kühlmittelumlauf abgibt.As can be seen from the above-described prior art, with the transfer of exhaust heat to the cooling water is associated with a considerable construction effort. With the arrangement of an exhaust gas / water heat exchanger for cooling in the Machine intake air recirculated exhaust gas are associated functional disadvantages that both the dimensioning and the arrangement of the EGR cooler within of the coolant circulation of the internal combustion engine. So within the EGR range of coolant throughput through the EGR cooler using a thermostat throttling, because if the EGR amount cools down too much, the advantages of NOx reduction can be partially compensated for by increases in HC emissions. Outside the EGR area with the exhaust gas recirculation line closed into the engine intake air must be caused by gas pulsation, especially in Full load range in the order of magnitude above the actual EGR heat quantity horizontal exhaust gas heat is dissipated to local boiling in the EGR cooler or Avoid heat exchangers. This requires a clearly above the requirements of the EGR cooling function goes beyond radiator dimensioning. Eventually the inlet of the EGR cooler or heat exchanger to the return of the water cooler the internal combustion engine connected to achieve a good cooling effect to be able to feed the EGR heat exchanger with the coldest possible water, so this results when the thermostat of the internal combustion engine is closed, ie in an operating area where the internal combustion engine heats up rapidly The EGR heat exchanger is desired or additionally heating requirement is expected or cooler transfers its heat to the external coolant circulation.

Der Erfindung liegt die Aufgabe zugrunde, bei einer gattungsgemäßen Brennkraftmaschine unter Verwendung eines AGR-Wärmetauschers mit geringem Aufwand in einem bestimmten Betriebsbereich die im Abgas vorhandene Wärme zu nutzen.The invention has for its object in a generic internal combustion engine using an EGR heat exchanger with little effort in use the heat present in the exhaust gas in a certain operating range.

Diese Aufgabe ist mit dem Patentanspruch 1 dadurch gelöst, daß der AGR-Wärmetauscher zur Nutzung von Abgaswärme gesteuert betreibbar ist, wobei in einer Abgasrückführleitung stromab des AGR-Ventils eine erste Weiche zur Verbindung mit einer Maschinen-Abgasleitung und in einer Zu- oder Abflußleitung des AGR-Wärmetauschers in einer dessen Drossel-Thermostaten umgehenden Bypass-Leitung eine zweite Weiche zum Kühlmittelumlauf vorgesehen sind, wobei das AGR-Ventil sowie die beiden Weichen bei Abgaswärme-Rückführung in den Kühlmittelumlauf kennfeldgesteuert sind auf einen freien, jeweiligen Mediumsdurchlaß.This object is achieved with claim 1 in that the EGR heat exchanger for the use of exhaust gas heat can be operated in a controlled manner Exhaust gas recirculation line downstream of the EGR valve a first switch for connection with a machine exhaust pipe and in an inlet or outlet pipe of the EGR heat exchanger in a bypass line bypassing its throttle thermostats a second switch for coolant circulation are provided, the EGR valve as well as the two switches for exhaust gas heat recirculation into the coolant circulation Map-controlled are on a free, respective medium passage.

Die Erfindung ist besonders vorteilhaft bei einem gegebenen AGR-Wärmetauscher in einfacher Weise zu realisieren für eine vorteilhaft rasche Erwärmung des Kühlmittels der Brennkraftmaschine nach einem Kaltstart.The invention is particularly advantageous with a given EGR heat exchanger to realize in a simple manner for an advantageous rapid heating of the coolant the internal combustion engine after a cold start.

Für eine gleichzeitige rasche Erwärmung einer Fahrzeugheiz- und/oder Klimaanlage ist in Ausgestaltung der Erfindung vorgeschlagen, daß der AGR-Wärmetauscher stromauf des Thermostaten der Brennkraftmaschine mit dem Kühlmittelumlauf zulaufseitig in Verbindung steht. Damit wird in vorteilhafter Weise dem AGR-Wärmetauscher in der Warmlaufphase der Brennkraftmaschine nach einem Kaltstart sich erwärmendes Kühlmittel zugeführt, das seinerseits durch das Abgas weiter erwärmt ist. Diese Anordnung erlaubt in weiterer vorteilhafter Weise das durch Nutzung der Abgaswärme rascher erwärmte Kühlmittel in den internen bzw. Kurzschluß-Kreislauf der Brennkraftmaschine einzuspeisen.For simultaneous rapid heating of a vehicle heating and / or air conditioning system is proposed in an embodiment of the invention that the EGR heat exchanger upstream of the thermostat of the internal combustion engine with the coolant circulation on the inlet side communicates. This is advantageously the EGR heat exchanger in the warm-up phase of the internal combustion engine after a cold start warming coolant supplied, which in turn heats up by the exhaust gas is. This arrangement allows this in a further advantageous manner by using the Exhaust gas heat cools the coolant more quickly into the internal or short circuit feed the internal combustion engine.

In weiterer Ausgestaltung der Erfindung kann auch vorgesehen sein, daß der AGR-Wärmetauscher bei Abgaswärme-Rückführung zulaufseitig gesteuert stromauf des Thermostaten der Brennkraftmaschine mit dem Kühlmittelumlauf und bei anschließender Abgas-Kühlung zulaufseitig gesteuert stromab eines Kühlers der Brennkraftmaschine mit dem Kühlmittelumlauf verbindbar ist. Mit dieser Ausgestaltung kann bei einem an die Warmlaufphase im Teillastbetrieb anschließenden Abgasrückführ-Betrieb der AGR-Wärmetauscher mit relativ kühlem Kühlmittel beaufschlagt werden.In a further embodiment of the invention it can also be provided that the EGR heat exchanger with exhaust gas heat recirculation controlled upstream of the Thermostats of the internal combustion engine with the coolant circulation and subsequent Exhaust gas cooling controlled on the inlet side downstream of a cooler Internal combustion engine can be connected to the coolant circulation. With this configuration can be used in an exhaust gas recirculation mode following the warm-up phase in partial load mode the EGR heat exchanger is charged with relatively cool coolant become.

Hinsichtlich der einfachen Ausgestaltung wird weiter vorgeschlagen, daß die erste Weiche als Abgasweiche und die zweite Weiche als Kühlmittelweiche jeweils als eine Steuerklappen-Vorrichtung gestaltet sind.With regard to the simple design, it is further proposed that the first Switch as exhaust switch and the second switch as coolant switch each as a control valve device are designed.

Um die Gasdynamik der Maschinen-Abgasleitung durch den Nebenstrom über den AGR-Wärmetauscher bei geöffneter Abgasweiche nicht wesentlich zu stören, ist in weiterer Ausgestaltung der Erfindung stromab der Abgasweiche in der Verbindung mit der Maschinen-Abgasleitung eine Drosselstelle angeordnet. Diese Anordnung ist insbesondere bei einem in der Maschinen-Abgasleitung angeordneten Abgasturbolader von Bedeutung, wobei die gedrosselte Verbindung nach einem weiteren Vorschlag stromab der Turbine des Abgasturboladers in die Maschinen-Abgasleitung mündet. Zur vorteilhaft schnellen Erwärmung des Kühlmittelumlaufes im internen Kreislauf der Brennkraftmaschine ist ferner vorgeschlagen, daß der AGR-Wärmetauscher abflußseitig mit einer Rücklaufleitung einer mit dem Kühlmittelumlauf der Brennkraftmaschine gesteuert verbindbaren Fahrzeugheiz- und/oder Klimaanlage in Verbindung steht. Da diese Heiz-Rücklaufleitung üblicherweise in den internen- bzw. Kurzschlußkreis der Brennkraftmaschine stromauf einer Wasserpumpe mündet, ist somit eine rasche und intensive Erwärmung der Brennkraftmaschine einschließlich der zusteuerbaren Fahrzeugheizung erzielt.To the gas dynamics of the engine exhaust pipe through the bypass over the EGR heat exchanger with open exhaust switch is not to be significantly disturbed Another embodiment of the invention downstream of the exhaust switch in the connection arranged a throttle point with the engine exhaust pipe. This arrangement is in particular in the case of an exhaust gas turbocharger arranged in the engine exhaust line of importance, the throttled connection according to another proposal downstream of the turbine of the exhaust gas turbocharger into the engine exhaust pipe flows. For the advantageous rapid heating of the coolant circulation in the internal Circuit of the internal combustion engine is also proposed that the EGR heat exchanger on the discharge side with a return line with the coolant circulation of the Internal combustion engine controlled connectable vehicle heating and / or air conditioning in Connection is established. Since this heating return line is usually in the internal or Short circuit of the internal combustion engine opens upstream of a water pump thus including rapid and intensive heating of the internal combustion engine the controllable vehicle heating achieved.

Um schließlich bei einer mit einem Abgasturbolader ausgerüsteten Brennkraftmaschine im Kaltstartbereich die Wirkung des Abgasturboladers durch den Abgas-Nebenstromweg über den AGR-Wärmetauscher nicht ungünstig zu beeinflussen, wird weiter vorgeschlagen, daß die Abgasweiche und die Kühlmittelweiche sowie das AGR-Ventil bei einem in der Maschinen-Abgasleitung vorgesehenen Lader nach Maschinenstart zeitverzögert offen gesteuert sind. Damit ist das Hochlaufen des Abgasturboladers auf alle Fälle sichergestellt.Finally, for an internal combustion engine equipped with an exhaust gas turbocharger in the cold start area the effect of the exhaust gas turbocharger through the exhaust gas bypass path not adversely affected by the EGR heat exchanger, it is further proposed that the exhaust gas switch and the coolant switch as well the EGR valve on a charger provided in the engine exhaust pipe Machine start are controlled open delayed. This is the start of the Exhaust gas turbocharger ensured in all cases.

Die Erfindung ist anhand eines in der Zeichnung schematisch dargestellten Kühlmittelkreislaufes einer flüssigkeitsgekühlten Brennkraftmaschine mit einem Abgasrückführsystem beschrieben.The invention is based on a coolant circuit shown schematically in the drawing a liquid-cooled internal combustion engine with an exhaust gas recirculation system described.

Eine flüssigkeitsgekühlte, kennfeldgesteuerte Brennkraftmaschine 1 mit einem Abgasrückführsystem 2 umfaßt einen mit einem mittels eines Thermostaten 3 gesteuerten Kühlmittelumlauf zu- und abflußseitig verbundenen AGR-Wärmetauscher 5 zur Kühlung des über ein AGR-Ventil 6 gesteuert in die Maschinen-Ansaugluft 7 rückgeführten Abgases, wobei der AGR-Wärmetauscher 5 abflußseitig über einen Drossel-Thermostaten 8 gesteuert ist.A liquid-cooled, map-controlled internal combustion engine 1 with an exhaust gas recirculation system 2 comprises one controlled by a thermostat 3 Coolant circulation connected to the EGR heat exchanger on the inlet and outlet side 5 for cooling the controlled in the machine intake air 7 via an EGR valve 6 recirculated exhaust gas, the EGR heat exchanger 5 on the discharge side via a Throttle thermostat 8 is controlled.

Um bei dieser Brennkraftmaschine 1 unter Verwendung des AGR-Wärmetauschers 5 in der Kaltstartphase die im Abgas enthaltene Wärme zu nutzen, wird erfindungsgemäß vorgeschlagen, daß der AGR-Wärmetauscher 5 zur Nutzung von Abgaswärme gesteuert betreibbar ist, wobei in einer Abgasrückführleitung 9 stromab des AGR-Ventils 6 eine erste Weiche 10 zur Verbindung mit einer Maschinen-Abgasleitung 11 und in der Abflußleitung 12 des AGR-Wärmetauschers 5 in einer dessen Drossel-Thermostaten 8 umgehenden Bypass-Leitung 13 eine zweite Weiche 14 zum Kühlmittelumlauf der Brennkraftmaschine 1 vorgesehen sind, wobei das AGR-Ventil 6 sowie die beiden Weichen 10 und 14 bei Abgaswärme-Rückführung in den Kühlmittelumlauf 4 kennfeldgesteuert sind auf einen freien, jeweiligen Mediumsdurchlaß.In order to use this EGR heat exchanger in this internal combustion engine 1 5 Using the heat contained in the exhaust gas in the cold start phase is invented proposed that the EGR heat exchanger 5 to use exhaust heat can be operated in a controlled manner, with an exhaust gas recirculation line 9 downstream of the EGR valve 6 a first switch 10 for connection to an engine exhaust pipe 11 and in the drain line 12 of the EGR heat exchanger 5 in one of them Throttle thermostats 8 bypass line 13 a second switch 14 are provided for the coolant circulation of the internal combustion engine 1, the EGR valve 6 and the two switches 10 and 14 for exhaust gas heat recirculation in the Coolant circulation 4 are map-controlled on a free, respective medium passage.

Um in der Warmlaufphase der Brennkraftmaschine 1 eine rasche Erwärmung des umlaufenden Kühlmittels zu erzielen, steht der AGR-Wärmetauscher 5 stromauf des Thermostaten 3 der Brennkraftmaschine 1 mit dem Kühlmittelumlauf 4 zulaufseitig in Verbindung, womit maschinenseitig erwärmtes Kühlmittel dem AGR-Wärmetauscher 5 zugeführt ist, dessen Temperatur durch die Nutzung der Abgaswärme weiter gesteigert ist.In order to rapidly warm up the internal combustion engine 1 during the warm-up phase To achieve circulating coolant, the EGR heat exchanger 5 is upstream of the Thermostats 3 of the internal combustion engine 1 with the coolant circulation 4 on the inlet side Connection with which coolant heated on the machine side to the EGR heat exchanger 5 is supplied, the temperature of which is further increased by using the exhaust gas heat is.

Um gegebenenfalls bei an die Warmlaufphase anschließender Abgasrückführung im Teillastbereich eine stärkere Kühlung des rückgeführten Abgases zu erreichen, kann die Brennkraftmaschine 1 weiter so ausgerüstet sein, daß bei Abgas-Kühlung der AGR-Wärmetauscher 5 zulaufseitig - nicht gezeigt - gesteuert stromab eines Kühlers 15 der Brennkraftmaschine 1 mit dem Kühlmittelumlauf 4 verbindbar ist.In order, if necessary, in the exhaust gas recirculation following the warm-up phase To achieve greater cooling of the recirculated exhaust gas in the partial load range, The internal combustion engine 1 can be further equipped so that with exhaust gas cooling the EGR heat exchanger 5 on the inlet side - not shown - is controlled downstream of one Radiator 15 of the internal combustion engine 1 can be connected to the coolant circulation 4.

Zur Erzielung eines einfachen Aufbaues der Anordnung zur Abgas-Wärme-Nutzung sind die erste Weiche 10 als Abgasweiche und die zweite Weiche 14 als Kühlmittelweiche jeweils als eine Steuerklappen-Vorrichtung gestaltet, die jeweils kennfeldgesteuert betätigt sind.To achieve a simple structure of the arrangement for exhaust gas heat use are the first switch 10 as an exhaust switch and the second switch 14 as a coolant switch each designed as a control flap device, each controlled by a map are operated.

Um die Gasdynamik der Maschinen-Abgasleitung 11 nicht wesentlich zu stören durch den Abgas-Nebenstrom durch den AGR-Wärmetauscher 5 bei wirksamer Abgaswärme-Nutzung durch die offen gesteuerte Abgasweiche 10 ist stromab der Abgasweiche 10 in einer Verbindung 16 mit der Maschinen-Abgasleitung 11 eine Drosselstelle 17 angeordnet.In order not to significantly disturb the gas dynamics of the engine exhaust pipe 11 by the exhaust gas bypass flow through the EGR heat exchanger 5 with effective use of exhaust gas heat through the open-controlled exhaust switch 10 is the exhaust switch downstream 10 in a connection 16 with the engine exhaust pipe 11 a Throttle point 17 arranged.

Bei einer insbesondere als Dieselmotor gestalteten Brennkraftmaschine 1 mit einem in der Maschinen-Abgasleitung 11 angeordneten Abgasturbolader 18 ist hierbei wesentlich, daß die gedrosselte Verbindung 16 stromab der Turbine des Abgasturboladers 18 in die Maschinen-Abgasleitung 11 mündet. In an internal combustion engine 1 designed in particular as a diesel engine Exhaust gas turbocharger 18 arranged in the engine exhaust line 11 is essential here that the throttled connection 16 downstream of the turbine of the exhaust gas turbocharger 18 opens into the machine exhaust pipe 11.

Zur Erzielung einer raschen Erwärmung des Kühlmittels im Kühlmittelumlauf 4 steht der AGR-Wärmetauscher 5 abflußseitig mit einer Rücklaufleitung 19 einer mit dem Kühlmittelumlauf 4 der Brennkraftmaschine 1 gesteuert verbindbaren Fahrzeug-und/oder Klimaanlage 20 in Verbindung, wobei die Heizungs-Rücklaufleitung 19 stromab des Thermostaten 3 der Brennkraftmaschine 1 stromauf eines Zulaufes einer Wasserpumpe 21 einmündet.To achieve rapid heating of the coolant in the coolant circulation 4 is the EGR heat exchanger 5 on the discharge side with a return line 19 one with the Coolant circulation 4 of the internal combustion engine 1 controlled connectable vehicle and / or Air conditioning unit 20 in connection, with the heating return line 19 downstream of the thermostat 3 of the internal combustion engine 1 upstream of an inlet a water pump 21 opens.

Um das Hochlaufen des Abgasturboladers 18 der Brennkraftmaschine 1 nach einem Kaltstart sicherzustellen, sind die Abgasweiche 10 und die Kühlmittelweiche 14 sowie das AGR-Ventil 6 nach einem Maschinenstart zeitverzögert offen gesteuert.To start the exhaust gas turbocharger 18 of the internal combustion engine 1 after a To ensure a cold start, the exhaust switch 10 and the coolant switch 14 and the EGR valve 6 is openly delayed open after an engine start.

Im übrigen kann der AGR-Wärmetauscher 5 mit einem separaten, wassergekühlten Ladeluftkühler (nicht gezeigt) baulich kombiniert sein.Otherwise, the EGR heat exchanger 5 can be equipped with a separate, water-cooled one Charge air cooler (not shown) can be structurally combined.

Claims (8)

Flüssigkeitsgekühlte Brennkraftmaschine mit einem Abgasrückführsystem, das einen mit einem mittels eines Thermostaten (3) gesteuerten Kühlmittelumlauf (4) einer kennfeldgesteuerten Brennkraftmaschine (1) zu- und abflußseitig verbundenen AGR-Wärmetauscher (5) zur Kühlung des über ein AGR-Ventil (6) gesteuert in die Maschinen-Ansaugluft (7) rückgeführten Abgases umfaßt, wobei der AGR-Wärmetauscher (5) zu- oder abflußseitig über einen Drossel-Thermostaten (8) gesteuert ist,
dadurch gekennzeichnet, daß der AGR-Wärmetauscher (5) zur Nutzung von Abgaswärme gesteuert betreibbar ist, wobei in einer Abgasrückführleitung (9) stromab des AGR-Ventils (6) eine erste Weiche (10) zur Verbindung mit einer Maschinen-Abgasleitung (11) und in einer Zu- oder Abflußleitung (12) des AGR-Wärmetauschers (5) in einer dessen Drossel-Thermostaten (8) umgehenden Bypass-Leitung (13) eine zweite Weiche (14) zum Kühlmittelumlauf (4) vorgesehen sind, wobei das AGR-Ventil (6) sowie die beiden Weichen (10, 14) bei Abgaswärme-Rückführung in den Kühlmittelumlauf (4) kennfeldgesteuert sind auf einen freien, jeweiligen Mediumsdurchlaß. Liquid-cooled internal combustion engine with an exhaust gas recirculation system, the one with a coolant circulation (4) controlled by a thermostat (3) of a map-controlled internal combustion engine (1) connected on the inflow and outflow sides of the EGR heat exchanger (5) for cooling the controlled by an EGR valve (6) into the machine intake air ( 7) recirculated exhaust gas, wherein the EGR heat exchanger (5) on the inlet or outlet side is controlled by a throttle thermostat (8),
characterized by that the EGR heat exchanger (5) can be operated in a controlled manner for the use of exhaust gas heat, wherein in an exhaust gas recirculation line (9) downstream of the EGR valve (6) a first switch (10) for connection to an engine exhaust line (11) and A second switch (14) for the coolant circulation (4) is provided in an inlet or outlet line (12) of the EGR heat exchanger (5) in a bypass line (13) bypassing its throttle thermostats (8), whereby the EGR valve (6) and the two switches (10, 14) for exhaust gas heat return to the coolant circulation (4) are map-controlled to a free, respective medium passage. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der AGR-Wärmetauscher (5) stromauf des Thermostaten (3) der Brennkraftmaschine (1) mit dem Kühlmittelumlauf (4) zulaufseitig in Verbindung steht.Internal combustion engine according to claim 1, characterized in that the EGR heat exchanger (5) upstream of the thermostat (3) of the internal combustion engine (1) is connected to the coolant circulation (4) on the inlet side. Brennkraftmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der AGR-Wärmetauscher (5) bei Abgaswärme-Rückführung zulaufseitig gesteuert stromauf des Thermostaten (3) der Brennkraftmaschine (1) mit dem Kühlmittelumlauf (4) und bei Abgas-Kühlung zulaufseitig gesteuert stromab eines Kühlers (15) der Brennkraftmaschine (1) mit dem Kühlmittelumlauf (4) verbindbar ist. Internal combustion engine according to claim 1, characterized in that the EGR heat exchanger (5) is controlled on the inlet side in the case of exhaust gas heat recirculation upstream of the thermostat (3) of the internal combustion engine (1) with the coolant circulation (4) and in the case of exhaust gas cooling, on the inlet side, it can be connected downstream of a cooler (15) of the internal combustion engine (1) to the coolant circulation (4). Brennkraftmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die erste Weiche (10) als Abgasweiche und die zweite Weiche (14) als Kühlmittelweiche jeweils als eine Steuerklappen-Vorrichtung gestaltet sind. Internal combustion engine according to one of claims 1 to 3, characterized in that that the first switch (10) as an exhaust switch and the second switch (14) as a coolant switch is designed as a control flap device. Brennkraftmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß stromab der Abgasweiche (10) in einer Verbindung (16) mit einer Maschinen-Abgasleitung (11) eine Drosselstelle (17) angeordnet ist.Internal combustion engine according to one of claims 1 to 4, characterized in that a throttle point (17) is arranged downstream of the exhaust switch (10) in a connection (16) with an engine exhaust line (11). Brennkraftmaschine nach Anspruch 5, dadurch gekennzeichnet, daß die Verbindung (16) stromab der Turbine eines Abgasturboladers (18) in die Maschinen-Abgasleitung (11) mündet.Internal combustion engine according to claim 5, characterized in that the connection (16) opens into the engine exhaust line (11) downstream of the turbine of an exhaust gas turbocharger (18). Brennkraftmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der AGR-Wärmetauscher (5) abflußseitig mit einer Rücklaufleitung (19) einer mit dem Kühlmittelumlauf (4) der Brennkraftmaschine (1) gesteuert verbindbaren Fahrzeugheiz- und/oder Klimaanlage (20) in Verbindung steht.Internal combustion engine according to one of claims 1 to 6, characterized in that the EGR heat exchanger (5) on the outlet side with a return line (19) of a vehicle heating and / or air conditioning system (20) which can be connected in a controlled manner to the coolant circulation (4) of the internal combustion engine (1). communicates. Brennkraftmaschine nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Abgasweiche (10) und die Kühlmittelweiche (14) sowie das AGR-Ventil (6) bei einem in der Maschinen-Abgasleitung (11) vorgesehenen Lader (18) nach einem Maschinenstart zeitverzögert offen gesteuert sind.Internal combustion engine according to one of Claims 1 to 7, characterized in that the exhaust gas switch (10) and the coolant switch (14) and the EGR valve (6) in a supercharger (18) provided in the engine exhaust gas line (11) after an engine start are controlled open delayed.
EP00109834A 1999-05-27 2000-05-10 Liquid cooled combustion engine with an exhaust gas recirculation system Expired - Lifetime EP1055813B1 (en)

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WO2004022940A1 (en) * 2002-09-04 2004-03-18 Ford Global Technologies, Llc Engine cooling systems
WO2005028847A1 (en) * 2003-09-05 2005-03-31 Daimlerchrysler Ag Internal combustion engine for a motor vehicle
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FR2883923A1 (en) * 2005-04-01 2006-10-06 Renault Sas Motor vehicle engine e.g. diesel engine, and unit e.g. alternator starter, cooling device, has auxiliary circuit with auxiliary pump permitting circulation of coolant part in auxiliary cooler and across radiator`s part, when valve is closed
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EP1918545A2 (en) * 2006-10-31 2008-05-07 International Engine Intellectual Property Company, LLC. Coolant controller for an internal combustion engine
EP1918545A3 (en) * 2006-10-31 2009-05-06 International Engine Intellectual Property Company, LLC. Coolant controller for an internal combustion engine
EP1970548A2 (en) * 2007-03-16 2008-09-17 Toyota Jidosha Kabushiki Kaisha Cooling apparatus for internal combustion engine
EP1970548A3 (en) * 2007-03-16 2009-09-23 Toyota Jidosha Kabushiki Kaisha Cooling apparatus for internal combustion engine
DE102010001752A1 (en) 2010-02-10 2011-08-11 Ford Global Technologies, LLC, Mich. Cooling system for use in internal combustion engine of hybrid vehicle, has exhaust gas recirculation radiator connected with low temperature refrigerant circuit according to termination of warming-up phase
CN102431414A (en) * 2011-11-17 2012-05-02 奇瑞汽车股份有限公司 Heating system adopting waste heat of automobile exhaust
US20140158784A1 (en) * 2012-12-11 2014-06-12 V2 Plug-In Hybrid Vehicle Partnership Handelsbolag Running a phev in ev mode under cold conditions
US9649910B2 (en) * 2012-12-11 2017-05-16 V2 Plug-In Hybrid Vehicle Partnership Handelbolag Running a PHEV in EV mode under cold conditions

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EP1055813B1 (en) 2002-11-20
DE50000779D1 (en) 2003-01-02

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