EP3884145A1 - Procede et dispositif de refroidissement d'un moteur a combustion interne - Google Patents
Procede et dispositif de refroidissement d'un moteur a combustion interneInfo
- Publication number
- EP3884145A1 EP3884145A1 EP19806024.6A EP19806024A EP3884145A1 EP 3884145 A1 EP3884145 A1 EP 3884145A1 EP 19806024 A EP19806024 A EP 19806024A EP 3884145 A1 EP3884145 A1 EP 3884145A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- loop
- clock
- cooling
- liquid
- time
- 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
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 44
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002826 coolant Substances 0.000 claims description 53
- 239000007788 liquid Substances 0.000 claims description 40
- 238000007872 degassing Methods 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 23
- 239000003507 refrigerant Substances 0.000 claims description 8
- 230000033228 biological regulation Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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 a coolant which circulates 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 detect the engine temperature and to open or "switch" one or more return circuit lines to allow the heated coolant to exit the engine and return to the pump inlet.
- 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 When the engine is cold or operating below a given temperature threshold, the thermostat allows you to close (or keep closed) the radiator duct and open (or keep open) a bypass duct so that the coolant does not circulate in the radiator, but is returned to the engine inlet.
- a device for cooling an internal combustion engine requires means to remove the gases from the coolant.
- the origin of these gases which increases the volume of the coolant and decreases its efficiency, generally comes from the leakage of the combustion gases outside the cylinder head. This can be prevented by providing a degassing pipe which leads from the engine to a so-called degassing tank or box in which the heated refrigerant can flow and which allows the separation of the gases from the heated refrigerant.
- the degassing pipe is part of an engine outlet circuit so that the heated coolant flows into the degassing tank and is then returned to the engine inlet circuit for recirculation.
- 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 in operation and when it does not. is not.
- the flow in the degassing tank occurs even when the volume of gas suspended in the refrigerant is low, and the degassing of the refrigerant is not necessary.
- the engine takes longer to warm up due to a potentially unnecessary flow of coolant into the degassing tank.
- the flow of coolant into the degassing tank can also adversely affect the performance of incidentally attached heating units for heating the engine during start-up in cold climates.
- the degassing operation of the coolant is associated with the threshold temperature for opening the thermostat and therefore with the cooling of said coolant.
- 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 a too low temperature regulation setpoint on the engine.
- Another objective of the present invention is to provide a method and a cooling device allowing regular degassing of the cooling circuit.
- the invention provides for this purpose a method of cooling an internal combustion engine by means of a cooling device comprising an inlet intended to admit a coolant into the engine and an outlet intended to evacuate said coolant, the device further comprising a pump at said inlet for setting in motion said liquid, as well as a means for regulating the circulation of the outgoing liquid, said regulating means allowing the coolant to borrow either a first loop, called bypass loop, or a second loop passing through an exchanger, called the cooling loop, said first and second loops performing a return to the motor input, the device further comprising a degassing unit connected to the second loop, the means for regulating circulation of the liquid comprising control means for directing the liquid as a function of its temperature towards the first o u indeed the second loop, said control means being provided with a first clock intended to count down the time CtO during which the coolant borrows the second loop, and of a second clock intended to count down the time CtEGZ during which the engine works, process in which:
- the liquid is directed towards the first loop, called the bypass loop, when the temperature of the liquid is below a determined threshold value, and is directed towards the second loop passing through the exchanger, when the temperature of the liquid is above said value threshold,
- the first clock for counting the time CtO by the first clock is activated when the coolant borrows the second loop
- the second CtEGZ time countdown clock by the second clock is activated when the engine is running
- the initial threshold value Tinit is lowered to a value T2 ⁇ Tinit, when the counting of time CtEGZ by the second clock exceeds a determined duration D2,
- the threshold value T2 is lowered to a value T3 ⁇ T2, when the counting of the time CtEGZ by the second clock exceeds a determined duration D3, D3> D2.
- the degassing operation of the coolant is associated with the threshold temperature for opening the thermostat and therefore with the cooling of said coolant.
- the first clock and the second clock are reset to zero when the counting of time CtO by the first clock exceeds a determined threshold value D1, D1> D3 and D1 ⁇ D2.
- the means for controlling the regulation means comprise a third clock intended to count down the time CtF during which the coolant 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 borrows the second loop, being reset to zero when the time count CtF exceeds a determined threshold value D4.
- the coolant is water, preferably additive, such as glycol water.
- the invention further provides a device for cooling an internal combustion engine, comprising an inlet for admitting a coolant into the engine and an outlet for discharging said coolant, the device further comprising a pump at said inlet for setting in motion said liquid, as well as a means for regulating the circulation of the outgoing liquid, said regulating means allowing the liquid to cooling to take either a first loop, called the bypass loop, or a second loop passing through a heat exchanger, called the cooling loop, said first and second loops performing a return to 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 the second loop, which are provided with at least one first clock intended to count down the time CtO during which the coolant borrows 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 coolant no longer circulates in the second loop, said clock being reset to zero when the counting 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 pitted upstream and downstream of the heat exchanger.
- the degassing unit can also be connected to the second loop by means of a second pitted circuit at the outlet of the regulating means and downstream of the heat exchanger.
- the means for regulating the circulation of the liquid leaving the engine is a thermostat.
- cooling device can also further comprise a third loop intended to supply a heating module for the passenger compartment.
- Figure 1 is a block diagram of the method according to one embodiment of the invention.
- Figure 2 is a schematic view of an embodiment of the device according to the invention.
- variants of the invention comprising only a selection of described characteristics, isolated from the other described characteristics (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 comprises at least one characteristic, preferably functional without structural details, or with only part of the structural details if this part only is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art .
- Figure 2 shows 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 coolant.
- the device further comprises a pump 5 at the level of said inlet for setting in motion said liquid through in particular the motor, as well as a means 7 for regulating the circulation of the liquid at outlet.
- the engine is connected to the regulating means 7 which allows the coolant to pass through either a first loop 9, called the bypass loop, or a second loop 8 passing through an exchanger 13 (generally a radiator), called the cooling loop.
- a first loop 9 called the 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 as a function of its temperature towards the first or else the second loop.
- the first and second loops are part of a cooling system return circuit, so that they return to the motor input.
- the means 7 for regulating the circulation of the liquid leaving the engine is a thermostat.
- the device also comprises a heating module 10 connected to the motor output circuit by means of a loop 3, so that heated coolant is supplied to the heating module and captured 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 unit 12 connected to the second loop 8.
- the degassing unit generally comprises a reservoir with a free air surface and a means for discharging the overpressure.
- the degassing unit 12 is connected to the second loop 8 by means of a first circuit 11 pitted upstream and downstream of the heat exchanger 13.
- the degassing unit 12 is additionally connected to the second loop 8 by means of a second circuit 4 spiked 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 the heated refrigerant to the degassing tank 12 where the gases can separate from the heated refrigerant.
- the circulation of 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 operating 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 loop of the radiator 13 which is used to extract the 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 changes as a function of the count of the first clock which counts down the time CtO when the coolant borrows the second loop, and as a function of the count of the second clock which counts down the CtEGZ time when the engine is running.
- the threshold value is initialized when all the counters are reset to zero at a determined value Tinit.
- the initial threshold value Tinit is lowered to a value T2 ⁇ Tinit, when the time count 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 filling time CtEGZ are stored between each run.
- the first clock and the second clock are reset to zero when the time count CtO of the first clock exceeds a determined threshold value D1, D1> D3 and D1 ⁇ D2.
- This process therefore incorporates a strategy of protection against fueling 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 taxiing, and does not reach a sufficient value to be able to reset the counter to 0. CtEGZ firing time of the second clock.
- the filling time counter will take a large value, and the engine will run unnecessarily on a low regulation setpoint, which will have an impact on consumption and on dilution.
- control means 1 of the regulating means 7 also comprise a third clock intended to count down the time CtF during which the coolant 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 borrows the second loop, being reset to zero when the counting of the time CtF exceeds a determined threshold value D4.
- the countdown of time 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 borrows 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 coolant no longer circulates in the second loop.
- the third clock only makes it possible to reset the clock CtO, which 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 as a function of three clocks counting down respectively 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 Dl, D2, D3 and D4 assigned respectively to the three clocks will be defined by the skilled person according to the type of engine chosen.
- the order of magnitude of D1 is ten minutes while the order of magnitude of D2 is one hour.
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)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
Description
Claims
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)
Publication Number | Publication Date |
---|---|
EP3884145A1 true EP3884145A1 (fr) | 2021-09-29 |
EP3884145B1 EP3884145B1 (fr) | 2022-11-30 |
Family
ID=66218184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19806024.6A Active EP3884145B1 (fr) | 2018-11-20 | 2019-10-16 | Procede et dispositif de refroidissement d'un moteur a combustion interne |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3884145B1 (fr) |
FR (1) | FR3088677B1 (fr) |
WO (1) | WO2020104735A1 (fr) |
Family Cites Families (5)
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 |
-
2018
- 2018-11-20 FR FR1871613A patent/FR3088677B1/fr not_active Expired - Fee Related
-
2019
- 2019-10-16 EP EP19806024.6A patent/EP3884145B1/fr active Active
- 2019-10-16 WO PCT/FR2019/052446 patent/WO2020104735A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
FR3088677A1 (fr) | 2020-05-22 |
FR3088677B1 (fr) | 2020-11-13 |
EP3884145B1 (fr) | 2022-11-30 |
WO2020104735A1 (fr) | 2020-05-28 |
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