EP2956656B1 - Verfahren zur regelung eines steuerventils zur steuerung des durchflusses eines kühlmittels zur kühlung der rückgeführten gase einer brennkraftmaschine - Google Patents

Verfahren zur regelung eines steuerventils zur steuerung des durchflusses eines kühlmittels zur kühlung der rückgeführten gase einer brennkraftmaschine Download PDF

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Publication number
EP2956656B1
EP2956656B1 EP14705834.1A EP14705834A EP2956656B1 EP 2956656 B1 EP2956656 B1 EP 2956656B1 EP 14705834 A EP14705834 A EP 14705834A EP 2956656 B1 EP2956656 B1 EP 2956656B1
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EP
European Patent Office
Prior art keywords
temperature
internal combustion
combustion engine
heat exchanger
liquid coolant
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Application number
EP14705834.1A
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English (en)
French (fr)
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EP2956656A1 (de
Inventor
Laurence HOUZE
Manuela Hennequin
Pascal Emery
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.)
Renault SAS
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Renault SAS
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    • 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
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • 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
    • F02M26/33—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
    • 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
    • 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

Definitions

  • the present invention generally relates to the field of recirculation of burnt gases from the exhaust to the inlet of an internal combustion engine.
  • It relates more particularly to a control method of a control valve of a flow of coolant circulating in a cooling circuit of a recirculation line of an internal combustion engine.
  • Such a cooling circuit then comprises a heat exchanger, said cooler EGR, which is crossed, on the one hand, by the recirculation gas, and, on the other hand, by a cooling liquid.
  • the cooling circuit also comprises a bistable valve, located downstream of the EGR cooler, which is controlled in the open or closed position depending on the measured temperature of the recirculation gases.
  • the opening of the bistable valve generates a large and brutal cooling of the recirculation gases, in particular when the internal combustion engine has not yet reached its optimum operating temperature.
  • the closure of the bistable valve also prevents any circulation of coolant in the EGR cooler, which can lead to a failure of cooling of the recirculation gases and a release into the atmosphere of a large amount of soot particles and dusts. 'hydrocarbon.
  • the coolant blocked in the EGR cooler may reach its boiling point and cause damage to the EGR cooler.
  • the present invention proposes a method for controlling the more reliable control valve.
  • step b) the ambient temperature is measured, a target coolant temperature is deduced therefrom and the control setpoint is developed as a function of the temperature of the measured coolant and the target temperature.
  • control valve is controlled between a greater number of positions, which allows a better regulation of the flow of coolant and avoids any problem of boiling or sudden temperature change.
  • This better regulation also considerably reduces the fouling of the cooling circuit, especially when starting the engine or when the ambient temperature is low.
  • control of the control valve as a function of the temperature of the coolant ensures a more precise regulation of the temperature of the recirculation gases.
  • the invention also proposes a cooling circuit as defined in the introduction which comprises a control unit of said control valve, which is adapted to implement a control method as defined above.
  • the invention further provides an internal combustion engine as defined in the introduction which comprises a cooling circuit as defined above, the heat exchanger of which is positioned on said recirculation line.
  • upstream and downstream will be used in the direction of the flow of gases from the point of collection of fresh air into the atmosphere to the exit of the flue gases in the atmosphere. atmosphere.
  • FIG 1 schematically shows an internal combustion engine 1 of a motor vehicle, which comprises a motor unit 10 provided with a crankshaft and four pistons (not shown) housed in four cylinders 11.
  • This engine is here compression ignition ( Diesel). It could also be spark ignition (gasoline).
  • the internal combustion engine 1 Upstream of the cylinders 11, the internal combustion engine 1 comprises an intake line 20 which takes fresh air into the atmosphere and which opens into an air distributor 25 arranged to distribute the air to each of the four cylinders 11 of the engine block 10.
  • This intake line 20 comprises, in the direction of flow of fresh air, an air filter 21 which filters the fresh air taken from the atmosphere, a compressor 22 which compresses the air. fresh air filtered by the air filter 21, a main air cooler 23 which cools this compressed fresh air, and an inlet valve 24 which regulates the flow of fresh air into the air distributor 25 .
  • the internal combustion engine 1 At the outlet of the cylinders 11, the internal combustion engine 1 comprises an exhaust line 80 which extends from an exhaust manifold 81 in which the gases which have been previously burned into the cylinders 11 are discharged, to a silencer exhaust 87 to relax the burnt gases before they are discharged into the atmosphere. It also comprises, in the flow direction of the flue gas, a turbine 82, and a catalytic converter 83 for treating burnt gases.
  • the turbine 82 is rotated by the flow of burnt gas leaving the exhaust manifold 81, and it drives the compressor 22 into rotation, thanks to mechanical coupling means such as a simple transmission shaft.
  • the catalytic converter 83 is here a three-way catalyst which contains an oxidation catalyst 84, a particulate filter 85 and a nitrogen oxide trap 86.
  • the internal combustion engine 1 also comprises a high-pressure flue gas recirculation line, from the exhaust line 80 to the intake line 20.
  • This recirculation line is commonly called the EGR-HP line 40, in accordance with FIG. to the English acronym of "Exhaust Gas Recirculation - High Pressure”. It originates in the exhaust line 80, between the exhaust manifold 81 and the turbine 82, and it opens into the intake line 20, between the inlet valve 24 and the air distributor 25.
  • This line EGR-HP 40 makes it possible to take a part of the flue gases circulating in the exhaust line 80, called recirculation gases or EGR gas, for reinjecting it into the cylinders 11 in order to reduce the polluting emissions of the engine, and in particular emissions of nitrogen oxides, soot and hydrocarbon particles.
  • This EGR-HP line 40 comprises an EGR-HP valve 41 for regulating the flow of EGR gas opening into the air distributor 25.
  • this EGR-HP line could be supplemented or replaced by a low-pressure flue gas recirculation line, commonly known as EGR-LP line according to the English acronym of "Exhaust Gas Recirculation - Low Pressure" ".
  • EGR-LP line would then be born in the exhaust line, at the exit of the catalytic converter, and lead into the intake line, between the air filter and the compressor.
  • the internal combustion engine 1 also comprises a fuel injection line 60 in the cylinders 11.
  • This injection line 60 comprises an injection pump 62 arranged to collect the fuel in a reservoir 61 to bring it under pressure in a distribution rail 63 which opens into the cylinders 11 via four injectors 64.
  • the internal combustion engine 1 further comprises a primary cooling circuit (not shown), which in particular passes through the engine block 10 and the main air cooler 23 and in which circulates a cooling liquid.
  • a primary cooling circuit (not shown), which in particular passes through the engine block 10 and the main air cooler 23 and in which circulates a cooling liquid.
  • the internal combustion engine 1 also comprises a secondary cooling circuit 30, which could possibly be confused with the primary cooling circuit, and which comprises a heat exchanger 31 provided for cooling the EGR gases flowing in the line EGR-HP 40 (or alternatively, in line EGR-LP), so as to best reduce the temperature of the gases in the air distributor 25 to provide the internal combustion engine 1 better performance.
  • a secondary cooling circuit 30 which could possibly be confused with the primary cooling circuit, and which comprises a heat exchanger 31 provided for cooling the EGR gases flowing in the line EGR-HP 40 (or alternatively, in line EGR-LP), so as to best reduce the temperature of the gases in the air distributor 25 to provide the internal combustion engine 1 better performance.
  • the heat exchanger 31, here called EGR cooler 31, is positioned on the line EGR-HP 40 to cool the EGR gas.
  • the EGR cooler 31 more specifically comprises a main pipe 31A through which the EGR gas flows, and a secondary pipe 31 B through which circulates a cooling liquid.
  • the main line 31A is connected, on one side, to the exhaust line 80 via an upstream line 42 of the EGR-HP line 40, and, on the other hand, to the EGR-HP valve 41 via a downstream duct. 43 of the line EGR-HP 40.
  • the secondary pipe 31 B is connected to the remainder of the secondary cooling circuit 30, on one side, by an upstream pipe 33, and on the other by a downstream pipe 34.
  • the secondary cooling circuit 30 further comprises a control valve 35 of the coolant flow.
  • This control valve 35 is here arranged on the upstream duct 33 of the secondary cooling circuit 30. In a variant, it could of course be arranged elsewhere, for example on the downstream duct.
  • the control valve 35 is here a butterfly flap, but it could of course be otherwise.
  • the circulation of the coolant in this secondary cooling circuit 30 is provided by a pressurizing pump (not shown).
  • the coolant used here is a mixture of water and glycol.
  • a computer 100 comprising a processor (CPU), a random access memory (RAM), a read-only memory (ROM), analog-digital converters (A / D) and input and output interfaces.
  • CPU central processing unit
  • RAM random access memory
  • ROM read-only memory
  • a / D analog-digital converters
  • the computer 100 is adapted to receive different sensors input signals relating to engine operation and climatic conditions.
  • a first temperature probe 101 is especially provided, which makes it possible to measure the instantaneous temperature T.sub.o of the coolant circulating in the secondary cooling circuit 30.
  • this first temperature probe 101 is located in the downstream duct 34.
  • a second temperature probe 102 is also provided for measuring the ambient temperature Ta, that is, the temperature outside the vehicle equipped with the internal combustion engine 1.
  • the first temperature probe will therefore be positioned at a distance from the EGR cooler 31, preferably at 10 cm from the latter, so that the measurements are not disturbed by the EGR cooler 31.
  • the first temperature sensor is located inside the EGR cooler itself.
  • the load C (also called “engine load”) corresponds to the ratio of the work supplied by the engine to the maximum work that could develop this engine at a given speed. It is usually approximated using a variable called effective average pressure SME.
  • the R speed corresponds to the speed of rotation of the crankshaft, expressed in revolutions per minute.
  • the computer 100 is adapted to generate, for each operating condition of the engine, output signals.
  • the computer 100 is adapted to transmit these output signals to the various components of the engine, in particular to the control valve 35.
  • the computer 100 initializes and then controls the starter and the fuel injectors 64 for them to start the internal combustion engine 1.
  • the fresh air taken from the atmosphere through the intake line 20 is filtered by the air filter 21, compressed by the compressor 22, cooled by the main air cooler 23, and then burned in the cylinders 11.
  • the burnt gases are expanded in the turbine 82, treated and filtered in the catalytic converter 83, then relaxed again in the exhaust silencer 84 before being released into the atmosphere.
  • the computer 100 for this purpose controls the control valve 35 of the coolant flow circulating in the secondary cooling circuit 30, so that these EGR gases are cooled to the desired temperature.
  • this control valve 35 is controlled in extreme closed position (the time that the temperature of the EGR gas increases) before being gradually opened.
  • the coolant flow circulating in the secondary cooling circuit 30 is regulated as a function of the temperature T 0 of the coolant (and not as a function of the temperature of the EGR gases), which in particular avoids any risk of boiling or sudden change in coolant temperature, benefiting the longevity of the EGR cooler 31.
  • control valve 35 may have at least five stable positions. It can of course be expected that it can have more than 10 stable positions.
  • control valve 35 can take an infinity of stable positions.
  • control method of the control valve 35 will be implemented as shown on the flowchart of the figure 3 .
  • the computer 100 implements the following algorithm.
  • the computer 100 first checks whether a stopping of the internal combustion engine 1 is required (operation 73).
  • the computer 100 controls the stopping of the coolant pressurizing pump (operation 74) and the stopping of the injection of fuel into the cylinders 11 (operation 75).
  • the computer 100 acquires the temperature To of the coolant downstream of the cooler EGR 31 (operation 76) as well as the ambient temperature Ta (operation 77).
  • the calculator 100 then calculates a target temperature Tc of coolant as a function of at least ambient temperature Ta measured (operation 78). This target temperature Tc corresponds to the optimum temperature coolant, resulting in reduced fouling of the EGR-HP 40 line.
  • this target temperature Tc is carried out using a mathematical formula or a map stored in the read-only memory (ROM) of the computer 100 (this map corresponding, at each ambient temperature Ta, a target temperature Tc ).
  • this target temperature Tc for example the instantaneous load C of the internal combustion engine 1 and / or the instantaneous R speed of the internal combustion engine 1, and / or the injected fuel flow rate. in the cylinders 11.
  • the computer 100 compares the measured coolant temperature To with the calculated target temperature Tc (operation 79).
  • control valve 35 is controlled at the opening (operation 84), so as to increase the flow of coolant circulating in the EGR cooler 31.
  • the regulation valve 35 is controlled at closing (operation 82), so as to reduce the flow rate of coolant circulating in the EGR cooler 31.
  • This control setpoint C1 is then transmitted to the control valve 35, which opens or closes accordingly (operations 82 or 84).
  • valve for regulating the coolant flow otherwise, especially when the temperature probe is located in the EGR cooler or downstream of the EGR cooler.
  • the flow rate and the temperature of the EGR gases can be measured or calculated as a function of engine speed and torque.

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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)

Claims (8)

  1. Verfahren zum Steuern eines Regelventils (35) einer Durchflussmenge eines in einem Kühlkreislauf (30) einer Rückführleitung (20) eines Verbrennungsmotors (1) zirkulierenden Kühlmittels, dadurch gekennzeichnet, dass es Schritte enthält, die darin bestehen:
    a) die Temperatur (To) des Kühlmittels zu erfassen,
    b) abhängig von der im Schritt a) erfassten Temperatur (To) einen Steuersollwert (C1) des Regelventils (35) in einer stabilen Stellung zu bestimmen, die unter mindestens drei stabilen Stellungen ausgewählt wird, und
    c) das Regelventil (35) gemäß dem im Schritt b) bestimmten Steuersollwert (C1) zu steuern,
    dadurch gekennzeichnet, dass im Schritt b) der Steuersollwert (C1) abhängig von der erfassten Temperatur (To) des Kühlmittels und einer Zieltemperatur (Tc) des Kühlmittels bestimmt wird, die von der vorher gemessenen Umgebungstemperatur (Ta) abgeleitet wird.
  2. Steuerverfahren nach Anspruch 1, wobei, da der Kühlkreislauf einen auf der Rückführleitung positionierten Wärmetauscher aufweist, im Schritt a) die Temperatur des Kühlmittels im Wärmetauscher gemessen wird.
  3. Steuerverfahren nach Anspruch 1, wobei, da der Kühlkreislauf (30) einen auf der Rückführleitung (20) positionierten Wärmetauscher (31) aufweist, im Schritt a) die Temperatur (To) des Kühlmittels in Abstand zum Wärmetauscher (31) gemessen wird.
  4. Steuerverfahren nach Anspruch 3, wobei im Schritt a) die Temperatur (To) des Kühlmittels stromabwärts hinter dem Wärmetauscher (31) gemessen wird.
  5. Steuerverfahren nach einem der Ansprüche 2 oder 4, wobei im Schritt b) ein Temperaturwert des Kühlmittels stromaufwärts vor dem Wärmetauscher abhängig von der gemessenen Temperatur des Kühlmittels, einer Durchflussmenge von Abgasen in der Rückführleitung und einer Temperatur von Abgasen in der Rückführleitung geschätzt wird.
  6. Steuerverfahren nach einem der Ansprüche 1 bis 5, wobei die augenblickliche Last (C) des Verbrennungsmotors (1) und/oder die augenblickliche Drehzahl (R) des Verbrennungsmotors (1) und/oder die Durchflussmenge von in Zylinder (11) des Verbrennungsmotors (1) eingespeistem Kraftstoff verwendet werden, um die Zieltemperatur (Tc) zu berechnen.
  7. Kühlkreislauf (30) der in einer Rückführleitung (20) eines Verbrennungsmotors (1) zirkulierenden Abgase, der enthält:
    - einen auf der Rückführleitung (20) positionierten Wärmetauscher (31),
    - zwei Kühlmittelzirkulationsleitungen (33, 34), die am Eingang bzw. am Ausgang des Wärmetauschers (31) angeschlossen sind, und
    - ein Regelventil (35) einer Kühlmitteldurchflussmenge, das auf einer der Zirkulationsleitungen (33, 34) angeordnet ist, dadurch gekennzeichnet, dass er eine Steuereinheit (40) des Regelventils (35) enthält, die geeignet ist, ein Steuerverfahren nach einem der Ansprüche 1 bis 6 durchzuführen.
  8. Verbrennungsmotor (1), der enthält:
    - einen Motorblock, der innen Zylinder definiert,
    - eine Ansaugleitung von Ansauggasen in die Zylinder,
    - eine Abgasleitung der Abgase aus den Zylindern,
    - eine Rückführleitung (20) der Abgase, die in der Abgasleitung beginnt und in die Ansaugleitung mündet,
    dadurch gekennzeichnet, dass er einen Kühlkreislauf (30) nach Anspruch 7 enthält.
EP14705834.1A 2013-02-15 2014-01-22 Verfahren zur regelung eines steuerventils zur steuerung des durchflusses eines kühlmittels zur kühlung der rückgeführten gase einer brennkraftmaschine Active EP2956656B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1351334A FR3002276B1 (fr) 2013-02-15 2013-02-15 Procede de pilotage d'une vanne de regulation d'un debit de liquide de refroidissement des gaz de recirculation d'un moteur a combustion interne
PCT/FR2014/050117 WO2014125181A1 (fr) 2013-02-15 2014-01-22 Procede de pilotage d'une vanne de regulation d'un debit de liquide de refroidissement des gaz de recirculation d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP2956656A1 EP2956656A1 (de) 2015-12-23
EP2956656B1 true EP2956656B1 (de) 2017-03-22

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EP14705834.1A Active EP2956656B1 (de) 2013-02-15 2014-01-22 Verfahren zur regelung eines steuerventils zur steuerung des durchflusses eines kühlmittels zur kühlung der rückgeführten gase einer brennkraftmaschine

Country Status (3)

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EP (1) EP2956656B1 (de)
FR (1) FR3002276B1 (de)
WO (1) WO2014125181A1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55131557A (en) * 1979-04-02 1980-10-13 Toyota Motor Corp Egr gas temperature controller
US8056544B2 (en) * 2008-08-27 2011-11-15 Ford Global Technologies, Llc Exhaust gas recirculation (EGR) system
KR101251526B1 (ko) * 2011-06-13 2013-04-05 기아자동차주식회사 저압 이지알 시스템 및 저압 이지알 쿨러 효율 진단방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
EP2956656A1 (de) 2015-12-23
WO2014125181A1 (fr) 2014-08-21
FR3002276B1 (fr) 2016-05-27
FR3002276A1 (fr) 2014-08-22

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