EP2187016A1 - Kühlmittelkreislauf eines Motors - Google Patents

Kühlmittelkreislauf eines Motors Download PDF

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Publication number
EP2187016A1
EP2187016A1 EP09174963A EP09174963A EP2187016A1 EP 2187016 A1 EP2187016 A1 EP 2187016A1 EP 09174963 A EP09174963 A EP 09174963A EP 09174963 A EP09174963 A EP 09174963A EP 2187016 A1 EP2187016 A1 EP 2187016A1
Authority
EP
European Patent Office
Prior art keywords
coolant
housing
thermostatic valve
degassing
water outlet
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.)
Withdrawn
Application number
EP09174963A
Other languages
English (en)
French (fr)
Inventor
Pierre Dumoulin
Armel Le Lievre
Ludovic Lefebvre
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP2187016A1 publication Critical patent/EP2187016A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • 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

Definitions

  • the invention relates to the cooling circuits of motor vehicle engines, and in particular the degassing of the heated coolant from the engine.
  • a known motor vehicle engine cooling system includes a water outlet housing having a thermostat.
  • the water outlet housing includes an outlet main line for conveying the coolant to a radiator whose function is to cool the liquid.
  • the thermostat opens to allow flow in the main line to the radiator.
  • the coolant thus cooled is then conveyed by means of a pipe of the radiator towards the inlet of a degassing box.
  • the degassing box makes it possible to remove gas bubbles present in the coolant. Gas bubbles appear in the coolant in particular during a filling fault or during a malfunction of the engine.
  • the degassed coolant is then piped to the inlet of a water pump located upstream of the engine.
  • the radiator has an output connected to an inlet of the water pump.
  • the pump helps to circulate the coolant in the engine and the thus-heated coolant is then recovered in the water outlet housing.
  • a first bypass line connects an outlet of the water outlet housing to the water pump. This first bypass line bypasses the radiator.
  • the water outlet housing includes a secondary coolant outlet pipe for supplying a coolant heater with the function of creating heating in the passenger compartment of the motor vehicle. The coolant recovered at the outlet of the heater is returned to the water pump via a nozzle in the first branch line.
  • a second branch line connects the water outlet box to an inlet of the degassing box. This line ensures continuous flow to the degassing box, even when the thermostat blocks flow to the radiator.
  • Such a cooling circuit has drawbacks.
  • coolant heating is relatively slow.
  • the heater will not be able to warm the vehicle interior sufficiently.
  • the engine takes longer to reach its optimum operating temperature.
  • the invention aims to solve these disadvantages.
  • the invention thus relates to a cooling circuit of an internal combustion engine, especially a motor vehicle, comprising a water outlet housing; a cooling radiator having a discharge outlet and an inlet connected to a first outlet of the water outlet housing; a degassing housing having a first inlet connected to the radiator discharge outlet and a second inlet connected to a second outlet of the water outlet housing; a first thermostatic valve selectively closing the flow between the water outlet housing and the radiator; characterized in that it further comprises a second thermostatic valve selectively closing the flow between the second outlet of the water outlet housing and the second inlet of the degassing housing, the thermostatic valve closing when the temperature of the coolant exceeds a first threshold.
  • automotive vehicle comprising a water outlet housing having first and second outlets; a cooling radiator having an inlet connected to the first outlet of the water outlet housing, and a discharge outlet of cooling liquid ; a degassing housing having a first inlet connected to the radiator discharge outlet and a second inlet connected to the second outlet of the water outlet housing; a first thermostatic valve selectively closing the flow between the water outlet housing and the radiator; and a second thermostatic valve selectively shutting off the flow between the second outlet of the water outlet housing and the second inlet of the degassing housing, the thermostatic valve closing when the coolant temperature exceeds a first threshold.
  • said first threshold is between -5 and 20 ° Celsius, and preferably between 0 and 5 ° Celsius.
  • the second thermostatic valve comprises a member whose thermal expansion displaces a seal and closes the flow between the second outlet of the water outlet housing and the second inlet of the degassing housing when said temperature of the coolant exceeds the first threshold.
  • said member is made of wax.
  • said thermostatic valve is disposed at the second outlet of the water outlet housing.
  • said first thermostatic valve opens when the temperature of the coolant exceeds a second threshold greater than the first threshold.
  • the second threshold is between 70 and 90 ° Celsius.
  • the circuit comprises a heater with an input connected to the water outlet housing.
  • the circuit comprises means for purging the circuit when the second thermostatic valve is closed. This variant is more particularly used if the vehicle frequently operates in extreme cold.
  • the invention proposes a cooling circuit for internal combustion engines of motor vehicles.
  • This circuit includes a water outlet housing connected to a cooling radiator via a first thermostatic valve that selectively closes the flow between them.
  • the water outlet housing is also connected to a degassing housing.
  • the radiator is also connected to the degassing box.
  • a second thermostatic valve selectively closes the flow between the water outlet housing and the degassing housing, the second thermostatic valve closes when the temperature of the coolant exceeds a threshold.
  • the invention limits heat losses after benefitting from degassing.
  • the temperature rise of the engine is therefore faster. It is not necessary to degrade certain points of operation of the engine to accelerate the rise in temperature, which leads to a reduction in fuel consumption.
  • the volume of coolant to be heated is reduced because of the closure of the second thermostatic valve. Consequently, the opening frequency of the first thermostatic valve will be higher, allowing more frequent degassing in cold weather. Moreover, this result is obtained with a simple solution having a particularly low additional cost.
  • the figure 1 illustrates an embodiment of a cooling circuit 1 according to the invention.
  • the arrows illustrate the direction of flow of the coolant in this circuit 1.
  • An internal combustion engine 2 typically a diesel engine for use in countries with cold climate, has tubings to be traversed by liquid of cooling. These pipes run in particular the cylinder head and the motor block 2.
  • a coolant outlet housing or water outlet housing 3 is intended to collect the coolant that has passed through the tubes of the engine 2.
  • An output of the housing of outlet 3 is connected to an inlet of a main radiator 7 via a pipe 6.
  • a thermostatic valve 5 is disposed on this outlet of the outlet housing 3, and selectively closes the flow of coolant in the 6.
  • a first outlet of the radiator 7 is connected to an inlet of a delivery pump 8, via a pipe 9.
  • the main radiator 7 is intended to evacuate the heat of the cooling liquid therethrough, through heat exchange with fresh air taken from outside the vehicle.
  • the radiator 7 has pipes communicating the pipe 6 with the pipe 9 and having a large heat exchange surface with air
  • the thermostatic valve 5 opens at a temperature between 70 and 90 ° Celsius to allow the flow of the coolant inside the radiator 7.
  • the radiator 7 has a second output.
  • This second output is advantageously arranged in the part This second outlet makes it possible to discharge coolant towards a degassing box 18.
  • the second outlet is connected to the inlet of the degassing box 18 via a pipe 17.
  • An outlet of the degassing box 18 is connected to an inlet of the pump 8 via a pipe 19.
  • a pipe connects an outlet of the outlet housing 3 to an inlet of the degassing housing 18. This connection makes it possible to degass the coolant when the thermostatic valve 5 is closed.
  • a thermostatic valve 4 selectively closes the flow between the outlet housing 3 and the degassing housing 18.
  • the thermostatic valve 4 When the temperature of the coolant in the outlet housing 3 is below a threshold, the thermostatic valve 4 remains open to allow flow to the degassing housing 18. Thus, when the coolant temperature is substantially not increased soon after starting the engine 2, the coolant can be degassed with a minimum of heat losses, the coolant has not yet absorbed a significant amount of heat from the engine 2.
  • the thermostatic valve 4 closes to close the flow of the outlet housing 3 to the degassing housing 18. This closure therefore occurs when the coolant begins to be warmed by the engine 2. Thus, closing the thermostatic valve 4 limits the heat dissipation during the heating of the coolant, the warming time of the coolant is thus reduced.
  • the closure of the valve 4 limits the amount of coolant to be heated, which increases the frequency of opening of the valve 5 and therefore the degassing frequency of the coolant when valve 4 is closed.
  • the opening temperature of the thermostatic valve 5 will be greater than the opening temperature of the thermostatic valve 4.
  • the threshold beyond which the thermostatic valve 4 closes will be advantageously between -5 and 10 ° Celsius, and preferably between 0 and 5 ° Celsius.
  • a bypass line 20 connects an outlet of the outlet housing 3 to an inlet of the discharge pump 8.
  • the bypass line 20 maintains a continuous circulation of coolant in the engine 2.
  • the pump 8 delivers liquid from the cooling in the tubes of the engine 2 and thus causes the coolant in the circuit 1.
  • the cooling circuit 1 comprises a heater 11.
  • This heater 11 withdraws cooling liquid in the outlet housing 3 via a pipe 10.
  • the cooling liquid having passed through the heater is discharged via a connected pipe 16. on an intermediate portion of the pipe 20.
  • This heater 11 comprises an exchanger for supplying the cabin of the vehicle with air heated by the coolant. Due to the closing of the thermostatic valve 4 during the heating phase of the coolant, the temperature of the coolant passing through the heater increases more rapidly. Thus, the heating of the cabin will intervene more quickly, without requiring overconsumption of fuel.
  • the thermostatic valve 4 may comprise, in a manner known per se, a member whose thermal expansion displaces a seal and closes the flow between the outlet box 3 and the inlet of the degassing box 18 beyond said first threshold. temperature.
  • This organ may for example be made of wax.
  • the figure 2 is a sectional view of an example of a thermostatic valve 4.
  • This thermostatic valve 4 has a piston 41 actuated by the expansion of a wax cartridge 43.
  • the thermostatic valve 4 is advantageously disposed near the outlet housing 3.
  • the wax cartridge 43 protrudes inside the outlet housing 3, in order to detect as soon as possible an increase in temperature of the coolant.
  • the cartridge 43 is directed upstream of the flow of the outlet housing 3 towards the degassing housing 18.
  • the thermostatic valve 4 will preferably be fixed directly on the outlet housing 3.
  • the wax cartridge 43 When the wax cartridge 43 is immersed in the coolant, it retracts the piston 41 when the temperature of this liquid is below the closure threshold. When the piston 41 is retracted (on the left side of the figure 2 ), it spreads a membrane 42 provided with a seal relative to a sealing seat 45. The coolant can then flow through the thermostatic valve 4 as illustrated by the arrow in broken lines. A spring 44 recalls the membrane 42 to its contact position (on the right side of the figure 2 ) with the seat 45 when the coolant temperature reaches the closing threshold. The piston 41 unfolds and lets the spring 44 apply the seal of the membrane 42 against the seat 45 to interrupt the flow through the thermostatic valve 4.
  • the Figures 3 to 5 schematically represent the hydraulic connections in the cooling circuit 1 in different cases of operation.
  • the coolant and the engine 2 are cold.
  • the coolant has a temperature below the closing temperature of the valve 4.
  • the valve 4 remains open and thus allows the degassing of the coolant.
  • the coolant has a temperature below the opening temperature of the valve 5.
  • the valve 5 thus remains closed and thus prevents the flow of coolant from the outlet housing 3 to the radiator 7.
  • the temperature of the coolant in the outlet housing 3 exceeds the closing threshold of the valve 4.
  • the valve 4 thus closes and thus closes the flow of coolant from the outlet housing 3 to the degassing housing 18
  • the temperature of the coolant in the outlet housing 3 is lower than the opening threshold of the valve 5.
  • the valve 5 thus remains closed and closes the flow of coolant from the outlet housing 3 to the radiator 7. The heat exchange of the coolant is thus reduced and its heating rate is thus optimized.
  • the temperature of the coolant in the outlet housing 3 increases.
  • the coolant applied to the thermostatic valve 5 then has a temperature greater than its opening threshold.
  • the thermostatic valve 5 thus opens and allows the flow of coolant from the outlet box 3 to the radiator 7, and then from the radiator 7 to the degassing box 18.
  • the coolant applied to the thermostatic valve 4 keeps a temperature above its closing threshold, and thus keeps the thermostatic valve 4 closed.
  • a thermostat open below a certain temperature for example between -5 ° C and 20 ° C to ensure the degassing of the circuit in this temperature range, then close beyond to promote the engine warm-up for cabin heating, consumption and abatement purposes.
  • these air pockets can cause irreversible damage to the engine (breakage) or dangerous (projection of hot fluids under pressure) or disturbing (noise in the heater) or also accumulate at the degassing thermostat, which is basic and preferentially a high point of the circuit, making it irremediably inoperative.
  • the element of figure 6 further comprises a valve 63, associated with a return spring 64; the thermostatic element 65 and the purge 66, an O-ring 67 is also provided.
  • the "trap” is positioned on the body of the degassing thermostat, at the thermostatic element, at a high point to ensure the proper filling and degassing of the circuit.
  • This element is both light and inexpensive so that it does not substantially change the total cost of the system, nor does it induce changes in the performance of the vehicle.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
EP09174963A 2008-11-13 2009-11-03 Kühlmittelkreislauf eines Motors Withdrawn EP2187016A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0857670A FR2938297A1 (fr) 2008-11-13 2008-11-13 Circuit de refroidissement moteur

Publications (1)

Publication Number Publication Date
EP2187016A1 true EP2187016A1 (de) 2010-05-19

Family

ID=40757039

Family Applications (1)

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EP09174963A Withdrawn EP2187016A1 (de) 2008-11-13 2009-11-03 Kühlmittelkreislauf eines Motors

Country Status (2)

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EP (1) EP2187016A1 (de)
FR (1) FR2938297A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2530736A (en) * 2014-09-30 2016-04-06 Ford Global Tech Llc Engine Cooling System
WO2020008040A1 (de) * 2018-07-06 2020-01-09 Volkswagen Aktiengesellschaft Kühlkreislauf für ein kraftfahrzeug und komponente des kühlkreislaufs sowie ein entlüftungsventil
FR3088677A1 (fr) * 2018-11-20 2020-05-22 Psa Automobiles Sa Procede et dispositif de refroidissement d'un moteur a combustion interne
CN112673156A (zh) * 2018-09-13 2021-04-16 标致雪铁龙汽车股份有限公司 防止热力发动机的冷却***中的载热流体集气的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3114127B3 (fr) 2020-09-15 2022-08-12 Renault Sas Piquage de dégazage thermostaté

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4131357C1 (en) * 1991-09-20 1992-07-09 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De IC engine cooling installation with engine-driven pump - has electrically driven second pump with external line contg. two thermostatic valves
FR2800125A1 (fr) * 1999-10-20 2001-04-27 Coutier Moulage Gen Ind Dispositif de distribution et de regulation d'un liquide de refroidissement dans un circuit de refroidissement d'un moteur a combustion interne et son procede
US6405688B1 (en) * 1999-11-26 2002-06-18 Daimlerchrysler Ag Cooling circuit for an internal combustion engine
US6550431B1 (en) 1998-07-31 2003-04-22 Volvo Lastvagnar Ab Method and a device for degassing a cooling system for an internal combustion engine
WO2008091027A2 (en) * 2007-01-25 2008-07-31 Toyota Jidosha Kabushiki Kaisha Cooling apparatus
WO2008097166A1 (en) * 2007-02-09 2008-08-14 Volvo Lastvagnar Ab Coolant system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4131357C1 (en) * 1991-09-20 1992-07-09 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De IC engine cooling installation with engine-driven pump - has electrically driven second pump with external line contg. two thermostatic valves
US6550431B1 (en) 1998-07-31 2003-04-22 Volvo Lastvagnar Ab Method and a device for degassing a cooling system for an internal combustion engine
FR2800125A1 (fr) * 1999-10-20 2001-04-27 Coutier Moulage Gen Ind Dispositif de distribution et de regulation d'un liquide de refroidissement dans un circuit de refroidissement d'un moteur a combustion interne et son procede
US6405688B1 (en) * 1999-11-26 2002-06-18 Daimlerchrysler Ag Cooling circuit for an internal combustion engine
WO2008091027A2 (en) * 2007-01-25 2008-07-31 Toyota Jidosha Kabushiki Kaisha Cooling apparatus
WO2008097166A1 (en) * 2007-02-09 2008-08-14 Volvo Lastvagnar Ab Coolant system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2530736A (en) * 2014-09-30 2016-04-06 Ford Global Tech Llc Engine Cooling System
GB2530736B (en) * 2014-09-30 2020-04-15 Ford Global Tech Llc Engine cooling system
WO2020008040A1 (de) * 2018-07-06 2020-01-09 Volkswagen Aktiengesellschaft Kühlkreislauf für ein kraftfahrzeug und komponente des kühlkreislaufs sowie ein entlüftungsventil
CN112673156A (zh) * 2018-09-13 2021-04-16 标致雪铁龙汽车股份有限公司 防止热力发动机的冷却***中的载热流体集气的方法
CN112673156B (zh) * 2018-09-13 2023-07-04 标致雪铁龙汽车股份有限公司 防止热力发动机的冷却***中的载热流体集气的方法
FR3088677A1 (fr) * 2018-11-20 2020-05-22 Psa Automobiles Sa Procede et dispositif de refroidissement d'un moteur a combustion interne
WO2020104735A1 (fr) * 2018-11-20 2020-05-28 Psa Automobiles Sa Procede et dispositif de refroidissement d'un moteur a combustion interne

Also Published As

Publication number Publication date
FR2938297A1 (fr) 2010-05-14

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