EP3746647B1 - Entgasungsgefäss für kraftfahrzeugkühlkreislauf - Google Patents

Entgasungsgefäss für kraftfahrzeugkühlkreislauf Download PDF

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Publication number
EP3746647B1
EP3746647B1 EP19701366.7A EP19701366A EP3746647B1 EP 3746647 B1 EP3746647 B1 EP 3746647B1 EP 19701366 A EP19701366 A EP 19701366A EP 3746647 B1 EP3746647 B1 EP 3746647B1
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EP
European Patent Office
Prior art keywords
heating element
heat exchange
liquid
exchange circuit
jar
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Application number
EP19701366.7A
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English (en)
French (fr)
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EP3746647A1 (de
Inventor
Valentin MAZET
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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/029—Expansion reservoirs
    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
    • 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
    • F01P2070/00—Details
    • F01P2070/04—Details using electrical heating elements

Definitions

  • the subject of the invention is fluid heat exchange circuits.
  • the boiling of a heat transfer fluid in such a circuit causes premature erosion of the fluid conduits of the circuit, resulting in a risk of liquid leakage.
  • the invention proposes rapid pressurization of the complete cooling circuit to limit the risk of boiling in the cooling circuit, in particular in the EGR exchangers, and therefore the need for coolant flow.
  • the document FROM 10 2011 108041 A1 presents such a solution.
  • the volume of gas is preferably configured to make it possible to absorb expansions of the liquid in the temperature range of use of said liquid.
  • the heat exchange circuit is advantageously further configured to be able to be closed with respect to the external environment so as to be sealed against said liquid and said gas, while allowing circulation of the liquid in a loop from the degassing jar to the jar degassing, preferably through at least one heat exchanger.
  • the degassing jar is equipped with a heating element, the heating element being placed so as to remain out of the liquid under the intended conditions of use, and being configured to allow the gas surmounting the liquid to be directly heated, preferably without be in contact with the liquid.
  • the heating element if the heating element does not remain entirely out of the liquid for the entire range of use of the exchange circuit, at least the heating element is configured for, over the range of use of the exchange circuit exchange, cause when activated, a more rapid rise in the temperature of the gas than it causes a rise in the temperature of the liquid circulating in the exchange circuit.
  • the heating element can typically comprise an electrical resistance, but other types of heating elements are possible, for example a heat exchanger with a second circulation of a second fluid.
  • the jar may include a closure cap in the upper part of the jar, the cap carrying the heating element.
  • At least one portion of the heating element is placed at a portion of the wall of the jar distinct from the cap.
  • the liquid pressure sensor is located closer to the heat exchanger than to the degassing tank.
  • the electronic control unit can be configured to activate the heating element when the pressure sensor transmits to it a measurement in deviation from a pressure setpoint value, or when boiling is detected via a predefined profile of pressure waves.
  • High frequency pressure waves can for example be indicative of the start of boiling of the liquid, which we wish to avoid, in order to limit erosion of the heat exchange circuit by cavitation.
  • the circuit may further include a liquid temperature sensor or estimator connected to the control unit.
  • the liquid pressure sensor is located closer to the heat exchanger than to the degassing tank.
  • the temperature estimator may include a temperature sensor, placed for example on the liquid circuit.
  • the electronic control unit can be configured to trigger heating by the heating element if a pair of values (pressure temperature) obtained using the temperature estimator and using the pressure sensor are found. on a predefined side of a recorded threshold curve, on the side of higher temperatures and lower pressures in relation to the threshold curve.
  • the threshold curve can correspond to a boiling threshold curve of the liquid.
  • the electronic control unit can be configured to, when activating the heating element, cause the sending of a constant heating power of a predefined level, for a predefined heating time.
  • the heating element can thus transmit a given quantity of energy before a new evaluation by the control unit, and before if necessary triggering the sending of another equivalent quantity of energy if the risk of boiling of the liquid remains effective.
  • the electronic control unit can be configured to estimate the position of a pair of values (pressure temperature) obtained using the temperature estimator and the using the pressure sensor, in relation to a map comprising a series of threshold curves or comprising a threshold surface, and the control unit can be configured to, upon activation of the heating element, cause the sending at least two different heating powers for at least two different positions of the point on the map.
  • the different heating powers can be obtained, on average, for example by sending several successive quantities of energy, each quantity corresponding to the supply of the heating element with the same electrical power for the same duration, the number of quantities and the time interval separating the quantities, being adapted to obtain on average the desired heating power.
  • the different heating powers can be obtained by powering the heating element, for a predefined duration, at an electrical power which is adapted as a function of the heating power determined from the mapping.
  • the invention also relates to a motor vehicle with a burnt gas recirculation system, the burnt gas recirculation system being cooled by a heat exchange circuit as described above.
  • a heat exchange circuit according to the invention comprises a heat exchanger 10 crossed by a liquid 8, which is brought by pipes 2, using a pump 14, from the heat exchanger 10 to a jar of degassing 3 of the circuit, then again towards the heat exchanger 10.
  • the liquid 8 passes through at least a second heat exchanger (not shown in the figures), in order to yield / respectively recover at least part of the calories stored / respectively released, at the level of the exchanger 10.
  • said second heat exchanger can be a unit heater which makes it possible to heat air blown towards the passenger compartment of the vehicle.
  • the jar 3 includes a closure cap 4.
  • the jar 3 is equipped with a heating element, designated by the reference 5 on the figure 1 .
  • the heating element is carried by the cap 4.
  • the heating element designated by the reference 6 on the figure 2
  • the heating element can be carried by the walls of the jar, above the level of the liquid 8.
  • the degassing jar is sized, and is placed in the thermal circuit so that the liquid 8 present in this jar is surmounted by a gaseous volume 9.
  • the heating element is connected to an electronic control unit 7 which triggers and/or regulates the electrical power supply to the heating element as a function of values, respectively P, T, delivered by a temperature sensor. pressure 11 and by a temperature sensor 12.
  • the Qcons setpoint sent by the electronic control unit 7 to the heating element 5, makes it possible to trigger an increase in temperature and pressure of the gas volume 9, therefore rapid pressurization liquid 8, in order to delay its boiling.
  • the electronic control unit 7 can for this purpose compare the values P, T to values recorded in a map 13, in order to determine whether the liquid 8 is in conditions close to boiling, or not.
  • the heat exchange circuit 1 may comprise a cooling circuit of a motor (motor not shown) which is connected to the heat exchanger 10. Consequently, the liquid 8 circulating in the degassing tank may be liquid circulating through the vehicle's engine to exchange calories.
  • the heat exchange circuit equipped with a degassing tank according to the invention makes it possible to tolerate use at a higher temperature of the heat transfer liquid, therefore to limit the flow rate thereof, which ultimately makes it possible to limit consumption. in fuel of the vehicle equipped with the heat exchange circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (10)

  1. Wärmeaustauschkreis (1), der enthält:
    - einen Kreis von Leitungen (2), in denen eine Flüssigkeit (8) strömt, die dazu bestimmt ist, Kalorien für eine Wärmeregelung zu transportieren;
    - einen mit dem Kreis von Leitungen (2) verbundenen Entgasungsbehälter (3), der konfiguriert ist, ein Ausdehnungsvolumen freizuhalten, in dem die Flüssigkeit von einem Gasvolumen (9) überlagert wird,
    dadurch gekennzeichnet, dass der Entgasungsbehälter (3) mit einem Heizelement (5, 6) ausgestattet ist, wobei das Heizelement so platziert ist, dass es unter den vorgesehenen Benutzungsbedingungen außerhalb der Flüssigkeit (8) bleibt, und konfiguriert ist, die direkte Erwärmung des die Flüssigkeit (8) überlagernden Gases (9) zu erlauben.
  2. Wärmeaustauschkreis nach Anspruch 1, wobei der Behälter (3) eine Verschlusskappe (4) im oberen Bereich des Behälters enthält, wobei die Kappe (4) das Heizelement (5) trägt.
  3. Wärmeaustauschkreis nach den Ansprüchen 1 oder 2, wobei der Behälter (3) eine Verschlusskappe (4) im oberen Bereich des Behälters enthält, und wobei mindestens ein Teil des Heizelements (6) im Bereich eines Wandabschnitts des Behälters getrennt von der Kappe (4) platziert ist.
  4. Wärmeaustauschkreis nach einem der Ansprüche 1 bis 3, der außerdem enthält:
    - einen von der Flüssigkeit durchquerten Wärmetauscher (10);
    - einen Drucksensor der Flüssigkeit (11);
    - eine elektronische Steuereinheit (7), die mit dem Heizelement (5) und mit dem Drucksensor (11) verbunden ist.
  5. Wärmeaustauschkreis nach Anspruch 4, wobei die elektronische Steuereinheit (7) konfiguriert ist, das Heizelement (5, 6) zu betätigen, wenn der Drucksensor (11) eine Messung eines vordefinierten Profils von Druckwellen an sie überträgt.
  6. Wärmeaustauschkreis nach einem der Ansprüche 4 oder 5, der außerdem einen Sensor (12) oder Temperaturschätzer der Flüssigkeit enthält, der mit der elektronischen Steuereinheit (7) verbunden ist.
  7. Wärmeaustauschkreis nach Anspruch 6, wobei die elektronische Steuereinheit (7) konfiguriert ist, eine Heizung durch das Heizelement (5, 6) auszulösen, wenn ein mit Hilfe des Temperaturschätzers (12) und mit Hilfe des Drucksensors (11) erhaltenes Paar von Druck- und Temperaturwerten (P, T) sich auf einer vordefinierten Seite einer Schwellwertkurve befindet, die in einer Kartographie (13) auf der Seite der höheren Temperaturen und niedrigeren Drücke bezüglich der Schwellwertkurve aufgezeichnet ist.
  8. Wärmeaustauschkreis nach einem der Ansprüche 4 bis 7, wobei die elektronische Steuereinheit (7) konfiguriert ist, bei der Aktivierung des Heizelements (5, 6) das Liefern einer konstanten Heizleistung mit vordefiniertem Pegel während einer vordefinierten Heizzeit zu bewirken.
  9. Wärmeaustauschkreis nach Anspruch 7, wobei die elektronische Steuereinheit (7) konfiguriert ist, die Position eines mit Hilfe des Temperaturschätzers (12) und mit Hilfe des Drucksensors (11) erhaltenen Paars von Druck- und Temperaturwerten (P, T) bezüglich einer Kartographie (13) zu schätzen, die eine Folge von Schwellwertkurven enthält oder eine Schwellwertfläche enthält, und die Steuereinheit (7) konfiguriert ist, bei der Aktivierung des Heizelements (5, 6) das Liefern von mindestens zwei unterschiedlichen Heizleistungen für mindestens zwei verschiedene Positionen des Punkts (P, T) auf der Kartographie zu senden.
  10. Kraftfahrzeug mit Abgasrückführsystem, wobei das Abgasrückführsystem einen Wärmeaustauschkreis (1) nach einem der vorhergehenden Ansprüche enthält, um das Abgasrückführsystem zu kühlen.
EP19701366.7A 2018-01-29 2019-01-29 Entgasungsgefäss für kraftfahrzeugkühlkreislauf Active EP3746647B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1850650A FR3077332B1 (fr) 2018-01-29 2018-01-29 Bocal de degazage pour circuit de refroidissement automobile
PCT/EP2019/052039 WO2019145550A1 (fr) 2018-01-29 2019-01-29 Bocal de dégazage pour circuit de refroidissement automobile

Publications (2)

Publication Number Publication Date
EP3746647A1 EP3746647A1 (de) 2020-12-09
EP3746647B1 true EP3746647B1 (de) 2024-01-24

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ID=61656031

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Application Number Title Priority Date Filing Date
EP19701366.7A Active EP3746647B1 (de) 2018-01-29 2019-01-29 Entgasungsgefäss für kraftfahrzeugkühlkreislauf

Country Status (4)

Country Link
EP (1) EP3746647B1 (de)
CN (1) CN111727308A (de)
FR (1) FR3077332B1 (de)
WO (1) WO2019145550A1 (de)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693763B1 (fr) * 1992-07-17 1994-09-02 Peugeot Perfectionnements apportés aux circuits de refroidissement des moteurs à combustion interne.
SE530868C2 (sv) * 2007-02-09 2008-09-30 Volvo Lastvagnar Ab Kylsystem
FR2923261A1 (fr) * 2007-11-06 2009-05-08 Renault Sas Vase d'expansion pressurise et moteur a combustion interne comprenant un tel vase d'expansion
FR2949509B1 (fr) * 2009-09-03 2011-11-25 Peugeot Citroen Automobiles Sa Moteur a combustion interne presentant un circuit de refroidissement muni d'un conduit de derivation
DE102011108041B4 (de) * 2011-07-19 2022-01-20 Daimler Ag Beheizbare Vorrichtung zum Steuern des Systemdrucks in einem Kühlmittelkreislauf für eine Brennkraftmaschine
FR2979693B1 (fr) * 2011-09-06 2013-08-23 Valeo Systemes Thermiques Dispositif de chauffage electrique pour vehicule automobile, et appareil de chauffage et/ou de climatisation associe
CN202789250U (zh) * 2012-08-27 2013-03-13 亚普汽车部件股份有限公司 一种能控制内部温度的燃油箱

Also Published As

Publication number Publication date
FR3077332A1 (fr) 2019-08-02
EP3746647A1 (de) 2020-12-09
WO2019145550A1 (fr) 2019-08-01
CN111727308A (zh) 2020-09-29
FR3077332B1 (fr) 2020-05-01

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