EP3884145B1 - Verfahren und vorrichtung zur kühlung eines verbrennungsmotors - Google Patents

Verfahren und vorrichtung zur kühlung eines verbrennungsmotors Download PDF

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Publication number
EP3884145B1
EP3884145B1 EP19806024.6A EP19806024A EP3884145B1 EP 3884145 B1 EP3884145 B1 EP 3884145B1 EP 19806024 A EP19806024 A EP 19806024A EP 3884145 B1 EP3884145 B1 EP 3884145B1
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EP
European Patent Office
Prior art keywords
loop
liquid
cooling
clock
time
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EP19806024.6A
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English (en)
French (fr)
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EP3884145A1 (de
Inventor
Michel ANGELI
Philippe Marcais
Olivier JEAN BAPTISTE
Daniel Coulaud
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PSA Automobiles SA
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PSA Automobiles SA
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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
    • 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
    • F01P11/028—Deaeration devices
    • 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
    • F01P11/0285—Venting devices
    • 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
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed

Definitions

  • the present invention relates to a method and a device for cooling an internal combustion engine. More specifically, the present invention relates to controlling the opening of the thermostat as a function of the coolant temperature.
  • a typical cooling system uses coolant that is circulated through the engine by means of, for example, a pump.
  • the liquid can be water advantageously comprising one or more additives.
  • Engine cooling systems typically include a heat exchanger (radiator) and a thermostat.
  • the thermostat can be used to sense engine temperature and to open or "switch" one or more lines of a return circuit to allow heated coolant to exit the engine and return as an inlet to the pump.
  • the thermostat can be arranged to open a radiator duct of the cooling system in order to allow the circulation of the heated coolant during its passage through the engine, in the radiator, and this, when the engine reaches a temperature threshold given.
  • the thermostat closes (or keeps closed) the radiator duct and opens (or keeps open) a bypass duct so that the coolant does not circulate in the radiator, but is returned to the engine inlet.
  • a cooling device for an internal combustion engine requires a means for removing gases from the coolant.
  • the origin of these gases which increase the volume of the coolant and reduce its efficiency, generally comes from the escape of combustion gases outside the cylinder head. This can be prevented by providing a degassing line which leads from the engine to a so-called degassing tank or box into which the heated coolant can flow and which allows the separation of gases from the heated coolant.
  • DE 10 2015 116407 A1 discloses such a method of cooling an internal combustion engine.
  • the degassing line is part of an engine outlet circuit so that heated coolant flows into the degassing tank and is then returned to the engine inlet circuit for recirculation. Because of this, the line leading to the degassing tank tends to be permanently open, so that the coolant flows into the degassing tank when the engine cooling system is operating and when it is not. is not. Thus, the flow in the degassing tank occurs even when the suspended gas volume in the refrigerant is small, and the degassing of the refrigerant is not necessary.
  • coolant flow into the degassing tank can also adversely affect the performance of incidentally attached heater units to warm the engine on start-up in cold climates.
  • the cooling liquid degassing operation is associated with the opening threshold temperature of the thermostat and therefore with the cooling of said liquid.
  • one of the objectives of the present invention is to propose a method and a cooling device allowing sufficient degassing of the coolant without imposing too low a thermal regulation setpoint on the engine.
  • Another object of the present invention is to provide a method and a cooling device allowing regular degassing of the cooling circuit.
  • the cooling liquid degassing operation is associated with the thermostat opening threshold temperature and therefore with the cooling of said liquid.
  • the first clock and the second clock are reset to zero when the countdown of time Ct0 by the first clock exceeds a determined threshold value D1, D1>D3 and D1 ⁇ D2.
  • control means of the regulation means comprise a third clock intended to count down the time CtF during which the cooling liquid no longer circulates in the second loop, said clock as well as the clock intended to count down the time CtO during which the cooling liquid takes the second loop, being reset to zero when the countdown of the time CtF exceeds a determined threshold value D4.
  • the cooling liquid is water, preferably with additives such as glycol water.
  • the invention also proposes a device for cooling an internal combustion engine, comprising an inlet intended to admit a liquid coolant into the engine and an outlet intended to evacuate said liquid coolant, the device further comprising a pump at the level of said inlet to set said liquid in motion, as well as means for regulating the circulation of the liquid at the outlet, said regulating means allowing the liquid to cooling to borrow either a first loop, called bypass loop, or a second loop passing through a heat exchanger, called cooling loop, said first and second loops effecting a return at the engine inlet, the device further comprising a degassing unit connected to the second loop, characterized in that the means for regulating the circulation of the liquid comprises control means for directing the liquid as a function of its temperature towards the first or else the second loop, which are provided with at least one first clock intended to count down the time CtO during which the coolant passes through the second loop, and a second clock intended to count down the time CtEGZ during which the engine operates.
  • control means of the regulation means comprise a third clock intended to count down the time CtF during which the cooling liquid no longer circulates in the second loop, said clock being reset to zero when the countdown of the time CtF exceeds a determined threshold value D4.
  • the degassing unit is connected to the second loop by means of a first circuit tapped upstream and downstream of the heat exchanger.
  • the degassing unit can also be connected to the second loop by means of a second circuit tapped at the output of the regulating means and downstream of the heat exchanger.
  • the means for regulating the circulation of the liquid at the engine outlet is a thermostat.
  • cooling device may also further comprise a third loop intended to supply a heating module of the passenger compartment.
  • variants of the invention may in particular be considered comprising only a selection of characteristics described, isolated from the other characteristics described (even if this selection is isolated within a sentence including these other features), if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
  • This selection includes at least one feature, preferably functional without structural details, or with only part of the structural details if only this part is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art .
  • the Figure 2 represents an example of an engine cooling device as envisaged in the invention.
  • the cooling device comprises an inlet intended to admit coolant into the engine and an outlet intended to evacuate said liquid coolant.
  • the engine is connected to the regulation means 7 which allows the coolant to borrow either a first loop 9, called bypass loop, or a second loop 8 passing through an exchanger 13 (generally a radiator), called the cooling loop.
  • a first loop 9 called bypass loop
  • a second loop 8 passing through an exchanger 13 (generally a radiator), called the cooling loop.
  • the means 7 for regulating the circulation of the liquid comprises control means 1 for directing the liquid according to its temperature towards the first or else the second loop.
  • the first and second loops are part of a feedback circuit of the cooling system, so that they provide feedback to the engine input.
  • the means 7 for regulating the circulation of the liquid leaving the motor is a thermostat.
  • the device also comprises a heating module 10 connected to the output circuit of the engine by means of a loop 3, so that heated coolant is supplied to the heating module and collected to supply heat to the passenger compartment of a vehicle before being returned to pump 5 via loop 3.
  • the device further comprising a degassing box 12 connected to the second loop 8.
  • the degassing box generally comprises a reservoir with a free air surface and a means of evacuating the excess pressure.
  • the degassing unit 12 is connected to the second loop 8 by means of a first circuit 11 tapped upstream and downstream of the heat exchanger 13.
  • the degassing box 12 is also connected to the second loop 8 by means of a second circuit 4 tapped at the outlet of the regulating means 7 and downstream of the heat exchanger 13.
  • the degassing circuit 4 is in permanent fluid communication with the engine, and allows the flow of heated coolant to the degassing tank 12 where the gases can separate from the heated coolant.
  • the circulation of the coolant in the device when the engine is cold or operating below a threshold temperature is due to the position of the thermostat which prevents the coolant from flowing through the radiator loop 13 and the coolant returns directly to the pump 5 via the bypass line 9.
  • the circulation of the coolant in the device when the engine is hot or operates above a threshold temperature, is linked to the position of the thermostat which prevents the coolant from passing through the bypass loop 9 and the heated coolant passes through the radiator loop 13 which serves to extract heat from the coolant before it is returned to the pump 5.
  • the opening of the thermostat 7 is controlled according to the method of the invention which defines that the liquid is directed towards the first bypass loop 9, when the temperature of the liquid is below a determined threshold value, and is directed towards the second loop 8 passing through the exchanger 13 when the temperature of the liquid is above said threshold value.
  • the determined threshold value evolves according to the countdown of the first clock which counts down the time CtO when the coolant passes through the second loop, and according to the countdown of the second clock which counts down the time CtEGZ when the engine is in operation.
  • the threshold value is initialized when all the counters are reset to a determined value Tinit.
  • the initial threshold value Tinit is lowered to a value T2 ⁇ Tinit, when the countdown of the time CtEGZ exceeds a determined duration D2.
  • the threshold value T2 is lowered to a value T3 ⁇ T2, when the countdown of the time CtEGZ of the second clock exceeds a determined duration D3, D3>D2.
  • the opening time CtO, the closing time CtF and the gassing time CtEGZ are stored between each run.
  • the first clock and the second clock are reset to zero when the countdown of the time Ct0 of the first clock exceeds a determined threshold value D1, D1>D3 and D1 ⁇ D2.
  • This method therefore incorporates a protection strategy against gassing which tends to increase the occurrence of the opening of the thermostat while lowering the regulation setpoint.
  • the opening time counter CtO of the first clock is reset to 0 between each run, and does not reach a sufficient value to be able to reset the opening time counter to 0. gassing time CtEGZ of the second clock.
  • the gassing time counter will take on a high value, and the engine will operate unnecessarily on a low regulation setpoint, which will have an impact on consumption and on dilution.
  • control means 1 of the regulation means 7 further comprise a third clock intended to count down the time CtF during which the cooling liquid no longer circulates in the second loop, said clock as well as the clock intended to count down the time CtO during which the coolant uses the second loop, being reset to zero when the countdown of the time CtF exceeds a determined threshold value D4.
  • the time countdown CtF of the third clock therefore takes place as soon as there has been at least one opening of the thermostat 7 and as soon as the coolant takes the bypass 9, that is to say when the vehicle is in a driving situation without the liquid cooling.
  • the determined threshold value Tinit also changes indirectly as a function of the countdown of the third clock which counts down the time CtF when the cooling liquid no longer circulates in the second loop.
  • the third clock only makes it possible to reset the clock CtO, which itself can modify the temperature threshold Tinit.
  • the method and the cooling device according to the invention use a thermostat whose opening is controlled by a threshold temperature value determined according to three clocks respectively counting down the opening time, the closing time of the thermostat and the driving time of the vehicle.
  • the predetermined temperature values Tinit, T2 and T3, as well as the durations D1, D2, D3 and D4 assigned respectively to the three clocks will be defined by those skilled in the art according to the type of motor chosen.
  • the order of magnitude of D1 is ten minutes while the order of magnitude of D2 is one hour.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Claims (10)

  1. Verfahren zum Kühlen eines Verbrennungsmotors mittels einer Kühlvorrichtung, die einen Einlass zum Einlassen von Kühlmittel in den Motor und einen Auslass zum Abführen des flüssigen Kühlmittels umfasst, wobei die Vorrichtung ferner eine Pumpe (5) auf Höhe des Einlasses umfasst die Flüssigkeit in Bewegung setzen, sowie ein Mittel (7) zum Regulieren der Zirkulation der Flüssigkeit am Auslass, wobei das Reguliermittel es der Kühlflüssigkeit ermöglicht, entweder einen ersten Kreislauf (9), Bypass-Kreislauf genannt, oder einen zweiten Kreislauf zu nehmen (8) durch einen als Kühlkreislauf bezeichneten Wärmetauscher (13) geführt, wobei der erste und der zweite Kreislauf eine Rückführung am Motoreinlass bewirken, wobei die Vorrichtung ferner eine Entgasungseinheit (12) umfasst, die mit dem zweiten Kreislauf (8) verbunden ist, dadurch gekennzeichnet dass das Mittel (7) zum Regulieren der Zirkulation der Flüssigkeit Steuermittel (1) zum Lenken der Flüssigkeit in Abhängigkeit von ihrer Temperatur hin umfasst s die erste oder die zweite Schleife, die mit einer ersten Uhr ausgestattet sind, die dazu bestimmt ist, die Zeit CtO herunterzuzählen, während der die Kühlflüssigkeit die zweite Schleife aufnimmt, und eine zweite Uhr, die dazu bestimmt ist, die Zeit CtEGZ herunterzuzählen, während der der Motor (6) arbeitet, ein Verfahren, bei dem :
    - die Flüssigkeit in Richtung des ersten Kreislaufs (9), Bypass-Kreislauf genannt, geleitet wird, wenn die Temperatur der Flüssigkeit unter einem bestimmten Schwellenwert liegt, und in Richtung des zweiten Kreislaufs (8) geleitet wird, der sie durchläuft der Austauscher (13), wenn die Temperatur der Flüssigkeit größer als der Schwellenwert ist,
    - die erste Countdown-Uhr CtO aktiviert wird, wenn die Kühlflüssigkeit den zweiten Kreislauf ausleiht,
    - die zweite Countdown-Uhr CtEGZ aktiviert wird, wenn der Motor läuft läuft,
    - der anfängliche Schwellwert Tinit auf einen Wert T2 < Tinit abgesenkt wird, wenn der Countdown der Zeit CtEGZ eine bestimmte Dauer D2 überschreitet,
    - der Schwellwert T2 wird auf einen Wert T3 < T2 abgesenkt, wenn der Countdown der Zeit CtEGZ der zweiten Uhr eine bestimmte Dauer D3 überschreitet, D3 > D2.
  2. Verfahren zum Kühlen eines Verbrennungsmotors nach Anspruch 1, dadurch gekennzeichnet, dass die erste Uhr und die zweite Uhr auf Null zurückgesetzt werden, wenn der Countdown der Zeit CtO der ersten Uhr einen bestimmten Schwellenwert D1 überschreitet, D1 > D3 und D1 < D2.
  3. Verfahren zum Kühlen eines Verbrennungsmotors nach Anspruch 2, dadurch gekennzeichnet, dass die Steuermittel (1) der Regelmittel (7) eine dritte Uhr umfassen, die dazu bestimmt ist, die Zeit CtF herunterzuzählen, während der die Kühlflüssigkeit nicht mehr zirkuliert die zweite Schleife, wobei sowohl die Uhr als auch die Uhr, die dazu bestimmt sind, die Zeit CtO herunterzuzählen, während der das Kühlmittel die zweite Schleife durchläuft, auf Null zurückgesetzt werden, wenn der Countdown der Zeit CtF einen bestimmten Schwellenwert D4 überschreitet.
  4. Verfahren zum Kühlen eines Verbrennungsmotors nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Kühlflüssigkeit Wasser, vorzugsweise mit Zusätzen, ist.
  5. Vorrichtung zum Kühlen eines Verbrennungsmotors (6), umfassend einen Einlass zum Einlassen von Kühlmittel in den Motor und einen Auslass zum Abführen des flüssigen Kühlmittels, wobei die Vorrichtung ferner eine Pumpe (5) an dem Einlass umfasst, um auch die Flüssigkeit in Bewegung zu setzen als ein Mittel (7) zum Regulieren der Zirkulation der Flüssigkeit am Auslass, wobei das Reguliermittel es der Kühlflüssigkeit ermöglicht, entweder einen ersten Kreislauf (9), Bypass-Kreislauf genannt, oder einen zweiten Kreislauf (8) zu leihen, der durch einen Wärmekreislauf strömt Austauscher (13), Kühlkreislauf genannt, wobei der erste und der zweite Kreislauf eine Rückführung am Motoreinlass durchführen, wobei die Vorrichtung ferner eine Entgasungseinheit (12) umfasst, die mit dem zweiten Kreislauf (8) verbunden ist, dadurch gekennzeichnet, dass die Mittel (7) zur Regulierung der Zirkulation der Flüssigkeit Steuermittel (1) umfasst, um die Flüssigkeit entsprechend ihrer Temperatur zu der ersten oder auch der s zu leiten zweiten Kreislauf, die mit einer ersten Uhr ausgestattet sind, die dazu bestimmt ist, die Zeit CtO herunterzuzählen, während der das Kühlmittel durch den zweiten Kreislauf fließt, und eine zweite Uhr, die dazu bestimmt ist, die Zeit CtEGZ herunterzuzählen, während der der Motor (6) arbeitet.
  6. Vorrichtung zum Kühlen eines Verbrennungsmotors nach Anspruch 5, dadurch gekennzeichnet, dass die Steuermittel (1) der Regelmittel (7) eine dritte Uhr umfassen, die dazu bestimmt ist, die Zeit CtF herunterzuzählen, während der die Kühlflüssigkeit nicht mehr zirkuliert die zweite Schleife, wobei die Uhr auf Null zurückgesetzt wird, wenn der Countdown der Zeit CtF einen bestimmten Schwellenwert D4 überschreitet.
  7. Vorrichtung zum Kühlen eines Verbrennungsmotors nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass der Entgasungskasten (12) mit dem zweiten Kreislauf (8) über einen ersten Kreislauf (11) verbunden ist, der stromaufwärts und stromabwärts des Wärmetauschers (1) angezapft ist (13).
  8. Vorrichtung zum Kühlen eines Verbrennungsmotors nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Entgasungseinheit (12) mit dem zweiten Kreislauf (8) mittels eines zweiten Kreislaufs (4) verbunden ist, der am Ausgang des Kreislaufs (4) angeschlossen ist Regelmittel (7) und stromabwärts des Wärmetauschers (13).
  9. Vorrichtung zum Kühlen eines Verbrennungsmotors nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, dass das Mittel (7) zum Regulieren der Zirkulation der Flüssigkeit am Ausgang des Motors ein Thermostat ist.
  10. Vorrichtung zum Kühlen eines Verbrennungsmotors nach einem der Ansprüche 5 bis 9, dadurch gekennzeichnet, dass die Vorrichtung ferner einen dritten Kreislauf (3) umfasst, der dazu bestimmt ist, ein Heizmodul (10) des Fahrgastraums zu versorgen.
EP19806024.6A 2018-11-20 2019-10-16 Verfahren und vorrichtung zur kühlung eines verbrennungsmotors Active EP3884145B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1871613A FR3088677B1 (fr) 2018-11-20 2018-11-20 Procede et dispositif de refroidissement d'un moteur a combustion interne
PCT/FR2019/052446 WO2020104735A1 (fr) 2018-11-20 2019-10-16 Procede et dispositif de refroidissement d'un moteur a combustion interne

Publications (2)

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EP3884145A1 EP3884145A1 (de) 2021-09-29
EP3884145B1 true EP3884145B1 (de) 2022-11-30

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FR (1) FR3088677B1 (de)
WO (1) WO2020104735A1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3932277B2 (ja) * 2002-10-18 2007-06-20 日本サーモスタット株式会社 電子制御サーモスタットの制御方法
FR2929330B1 (fr) * 2008-04-01 2010-04-09 Peugeot Citroen Automobiles Sa Circuit de refroidissement moteur.
FR2938297A1 (fr) * 2008-11-13 2010-05-14 Peugeot Citroen Automobiles Sa Circuit de refroidissement moteur
DE102014201170A1 (de) * 2014-01-23 2015-07-23 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Vorrichtung zur Entlüftung eines Wärmemanagementsystems einer Verbrennungskraftmaschine
GB2530736B (en) * 2014-09-30 2020-04-15 Ford Global Tech Llc Engine cooling system

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EP3884145A1 (de) 2021-09-29
FR3088677B1 (fr) 2020-11-13
WO2020104735A1 (fr) 2020-05-28
FR3088677A1 (fr) 2020-05-22

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