EP2187015B1 - Kühlmittelkreislauf eines Motors - Google Patents

Kühlmittelkreislauf eines Motors Download PDF

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Publication number
EP2187015B1
EP2187015B1 EP09173401A EP09173401A EP2187015B1 EP 2187015 B1 EP2187015 B1 EP 2187015B1 EP 09173401 A EP09173401 A EP 09173401A EP 09173401 A EP09173401 A EP 09173401A EP 2187015 B1 EP2187015 B1 EP 2187015B1
Authority
EP
European Patent Office
Prior art keywords
radiator
outlet
cooling circuit
thermostatic valve
cooling
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.)
Not-in-force
Application number
EP09173401A
Other languages
English (en)
French (fr)
Other versions
EP2187015A1 (de
Inventor
Pierre Dumoulin
Armel Le Lièvre
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 EP2187015A1 publication Critical patent/EP2187015A1/de
Application granted granted Critical
Publication of EP2187015B1 publication Critical patent/EP2187015B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/08—Cabin heater

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 temperature probe and 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 coolant thus cooled is then conveyed by means of a pipe to 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 pump helps to circulate the cooled coolant in the engine and the thus-heated coolant is then recovered in the water outlet housing.
  • the water outlet housing includes a first coolant outlet pipe for supplying a heater with water and whose function is to create heating in the passenger compartment of the motor vehicle.
  • the coolant recovered at the outlet of the heater is returned to the water outlet housing.
  • the water outlet housing has a second secondary outlet pipe connecting it to the inlet of the pump, and constituting a bypass portion bypassing the radiator. This bypass portion makes it possible to directly send heated coolant from the engine to the upstream portion of the cooling circuit positioned before said engine, passing through the water outlet housing.
  • An inlet of the water outlet housing is connected to the radiator. This inlet is closed by a thermostatic valve that opens only when the coolant temperature is high. The connection between the radiator and the degassing water outlet box allows a small flow to be maintained through the radiator even when the thermostatic valve at the inlet of the water outlet housing is closed.
  • 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, in particular a motor vehicle engine, comprising a cooling radiator having a coolant discharge outlet; a degassing housing having a coolant inlet connected to the exhaust outlet of the radiator; a thermostatic valve selectively sealing the flow between the radiator discharge outlet and the degassing box inlet, the thermostatic valve opening when the coolant temperature exceeds a first threshold.
  • the thermostatic valve includes a member whose thermal expansion displaces a seal and releases flow between the radiator discharge outlet and the degassing housing inlet when said coolant temperature exceeds the temperature. first threshold.
  • said member is made of wax.
  • said first threshold is between 45 and 65 ° Celsius, and preferably between 50 and 60 ° Celsius.
  • said thermostatic valve is disposed at the outlet of the radiator outlet.
  • no heat exchanger is connected between the thermostatic valve and the radiator.
  • said radiator outlet is formed in the upper part of this radiator.
  • the circuit further comprises a coolant outlet housing adapted to receive coolant from the engine; a pipe connecting the outlet box to the radiator; another thermostatic valve closing the pipe and opening when the temperature of the coolant applied to it exceeds a second threshold.
  • said conduit connects another radiator output to the output housing.
  • said second threshold is greater than the first threshold.
  • the circuit comprises a heater with an input connected to the output housing.
  • the invention proposes a cooling circuit for internal combustion engines of motor vehicles.
  • This circuit includes a cooling radiator.
  • An inlet of a degassing box is connected to a discharge outlet of the radiator.
  • a thermostatic valve selectively closes the flow between the radiator outlet and the inlet of the degassing housing. The thermostatic valve opens when the temperature of the coolant applied to it exceeds a threshold.
  • the invention makes it possible to limit the heat losses after a cold engine start.
  • 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. In addition, 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 flow direction of the coolant in this circuit 1.
  • An internal combustion engine 2 has nozzles intended to be traversed by coolant. These pipes run in particular through the cylinder head and the engine block 2.
  • a coolant outlet box 3 is intended to collect the coolant having passed through the tubes of the engine 2.
  • An output of the output box 3 is connected to an inlet a main radiator 7 through a pipe 6.
  • the main radiator 7 is intended to evacuate the heat of the coolant therethrough, by heat exchange with fresh air taken from the outside of the vehicle.
  • a first output of the radiator 7 is connected to an input of the output box 3, via a line 9.
  • a thermostatic valve 5 is disposed on this input of the output box 3, and selectively closes the flow of liquid In a manner known per se, the thermostatic valve 5 opens at a temperature of about 90 ° Celsius to allow the flow of the cooling liquid inside the radiator 7.
  • a bypass line 20 connects an outlet of the outlet box 3 to an inlet of a delivery pump 8.
  • the pump 8 delivers cooling liquid into the tubes of the engine 2 and thus causes the cooling liquid in the circuit 1.
  • the radiator 7 has a second output.
  • This second outlet is advantageously formed in the upper part of the radiator 7.
  • This second outlet makes it possible to discharge cooling liquid to a degassing box 18.
  • the second outlet is connected to the inlet of the degassing box 18 via of a pipe 17.
  • a thermostatic valve 4 selectively closes the flow in the pipe 17. When the temperature of the coolant that is applied to this valve 4 exceeds a first threshold, the valve 4 opens to allow the flow between the radiator 7 and the degassing housing 18.
  • An outlet of the degassing housing 18 is connected to an inlet of the pump 8 via a pipe 19.
  • the thermostatic valve 4 As long as the temperature of the coolant applied to the thermostatic valve 4 is lower than the first threshold, the flow through the degassing housing 18 is blocked. Thus, the thermostatic valve 4 will be kept closed when the engine 2 will be cold. The volume of the coolant that the engine 2 will heat up will be reduced. The cooling rate of the coolant will be increased.
  • the thermostatic valve 4 may comprise, in a manner known per se, a member whose thermal expansion displaces a seal and releases the flow between the outlet of the radiator 7 and the inlet of the degassing box 18 beyond said first threshold of 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 wax cartridge 43 is disposed inside the pipe 17, oriented towards its upstream part.
  • the piston 41 moves the piston 41 when the temperature of this liquid crosses the first threshold.
  • the piston 41 is moved (on the right side of the figure 2 )
  • the coolant can then flow as illustrated by the arrow in broken lines.
  • a spring 44 reminds the membrane 42 to its contact position (on the left side of the figure 2 ) with the seat 45 when the coolant temperature is below said threshold.
  • the wax cartridge 43 protrudes inside the radiator, in order to detect as soon as possible an increase in temperature.
  • the thermostatic valve 4 will preferably be fixed directly on the radiator 7.
  • the opening threshold of the thermostatic valve 4 is advantageously between 45 and 65 ° Celsius, and preferably between 50 and 60 ° Celsius. For such a temperature level, the coolant has been heated sufficiently and the opening of the thermostatic valve 4 will then ensure a safety against the presence of gas in the coolant.
  • the thermostatic valve 4 is placed at the exhaust outlet of the radiator 7.
  • the temperature of the coolant applied to the thermostatic valve 4 will be more rapidly representative of the temperature of this liquid at the outlet of the outlet housing 3.
  • the cooling circuit 1 does not have a heat exchanger connected between the thermostatic valve 4 and the radiator 7.
  • the opening temperature of the thermostatic valve 5 is preferably greater than the opening temperature of the thermostatic valve 4. Thus, as soon as the thermostatic valve 5 is open, the thermostatic valve 4 will open quickly when the thermostatic valve 5 is opened. coolant temperature rise in the radiator 7.
  • the cooling circuit 1 comprises a heater 11.
  • This heater 11 is connected to the outlet housing 3 via conduits 10 and 16.
  • This heater 11 comprises an exchanger intended to supply the passenger compartment with air heated by the liquid. cooling. Due to the closing of the thermostatic valve 4 when the engine 2 is cold, 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.
  • FIGS. 3 to 5 schematically represent the hydraulic connections in the cooling circuit 1 in different cases of operation.
  • engine 2 is cold.
  • the coolant has a temperature below the opening temperature of the valve 5.
  • the valve 5 remains closed and no flow takes place in the radiator.
  • the coolant also has a temperature below the opening temperature of the valve 4.
  • the valve 4 remains closed.
  • the temperature of the coolant in the outlet housing 3 exceeds the opening threshold of the valve 5.
  • the valve 5 opens and releases the flow of coolant in the radiator 7.
  • the coolant applied to the thermostatic valve 4 has a temperature below the opening threshold. The thermostatic valve 4 thus remains initially closed.
  • the temperature of the coolant in the radiator 7 increases, due to the circulation of coolant.
  • the coolant applied to the thermostatic valve 4 then has a temperature above the opening threshold.
  • the thermostatic valve 4 thus opens and allows the flow of cooling liquid from the radiator 7 to the degassing box 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Claims (11)

  1. Kühlkreislauf (1) eines Verbrennungsmotors (2), der einen Kühler (7) aufweist, der einen Ableitungsausgang für Kühlflüssigkeit aufweist, ein Entgasungsgehäuse (18), das einen Kühlflüssigkeitseingang aufweist, der an den Ableitungsausgang des Kühlers angeschlossen ist, dadurch gekennzeichnet, dass er ferner einen Thermostatschieber (4) aufweist, der selektiv den Abfluss zwischen dem Ableitungsausgang des Kühlers und dem Eingang des Entgasungsgehäuses verschließt, wobei sich der Thermostatschieber (4) öffnet, wenn die Temperatur der Kühlflüssigkeit einen ersten Schwellenwert überschreitet.
  2. Kühlkreislauf (1) nach Anspruch 1, bei dem der Thermostatschieber (4) ein Organ (43) aufweist, dessen Wärmedehnung eine Dichtung (42) verschiebt und den Abfluss zwischen dem Ableitungsausgang des Kühlers und dem Eingang des Entgasungsgehäuses freigibt, wenn die Temperatur der Kühlflüssigkeit den ersten Schwellenwert überschreitet.
  3. Kühlkreislauf (1) nach Anspruch 2, bei dem das Organ (43) aus Wachs hergestellt ist.
  4. Kühlkreislauf (1) nach einem der vorhergehenden Ansprüche, bei dem der erste Schwellenwert zwischen 45 und 65 °C liegt und vorzugsweise zwischen 50 und 60 °C.
  5. Kühlkreislauf nach einem der vorhergehenden Ansprüche, bei dem der Thermostatschieber (4) auf dem Niveau des Ableitungsausgangs des Kühlers (7) angeordnet ist.
  6. Kühlkreislauf nach einem der vorhergehenden Ansprüche, bei dem kein Wärmeaustauscher zwischen dem Thermostatschieber (4) und dem Kühler (7) angeschlossen ist.
  7. Kühlkreislauf nach einem der vorhergehenden Ansprüche, bei dem der Ausgang des Kühlers (7) in dem oberen Teil dieses Kühlers eingerichtet ist.
  8. Kühlkreislauf nach einem der vorhergehenden Ansprüche, der ferner ein Ausgangsgehäuse (3) für Kühlflüssigkeit aufweist, das Kühlflüssigkeit aufnehmen kann, die von dem Motor (2) kommt, eine Leitung (9), die das Ausgangsgehäuse (3) mit dem Kühler (7) verbindet, einen weiteren Thermostatschieber (5), der selektiv die Leitung (9) verschließt und sich öffnet, wenn die Temperatur des Kühlkreislaufs, die an ihn angelegt wird, einen zweiten Schwellenwert überschreitet.
  9. Kühlkreislauf nach Anspruch 8, bei dem die Leitung (9) einen anderen Ausgang des Kühlers (7) an das Ausgangsgehäuse (3) anschließt.
  10. Kühlkreislauf nach Anspruch 8 oder Anspruch 9, bei dem der zweite Schwellenwert größer ist als der erste Schwellenwert.
  11. Kühlkreislauf nach einem der Ansprüche 8 bis 10, der einen Lufterhitzer (11) aufweist, der mit einem Eingang versehen ist, der mit dem Ausgangsgehäuse (3) verbunden ist.
EP09173401A 2008-11-13 2009-10-19 Kühlmittelkreislauf eines Motors Not-in-force EP2187015B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0857676A FR2938298B1 (fr) 2008-11-13 2008-11-13 Circuit de refroidissement moteur

Publications (2)

Publication Number Publication Date
EP2187015A1 EP2187015A1 (de) 2010-05-19
EP2187015B1 true EP2187015B1 (de) 2011-12-07

Family

ID=40637137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09173401A Not-in-force EP2187015B1 (de) 2008-11-13 2009-10-19 Kühlmittelkreislauf eines Motors

Country Status (3)

Country Link
EP (1) EP2187015B1 (de)
AT (1) ATE536471T1 (de)
FR (1) FR2938298B1 (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716555A1 (de) * 1987-05-18 1988-12-08 Bayerische Motoren Werke Ag Befuell-, entlueftungs- und drucksteuer-vorrichtung fuer den fluessigkeits-kuehlkreis von kraft- und arbeitsmaschinen, insbesondere brennkraftmaschinen
FR2640315B1 (fr) * 1988-12-14 1991-02-08 Peugeot Dispositif de refroidissement a combustion interne
US5241926A (en) * 1991-08-09 1993-09-07 Mazda Motor Corporation Engine cooling apparatus
FR2804722B1 (fr) * 2000-02-03 2002-03-08 Peugeot Citroen Automobiles Sa Dispositif de refroidissement d'un moteur de vehicule automobile
FR2908830B1 (fr) * 2006-11-16 2008-12-19 Renault Sas Dispositif et procede de vidange d'un echangeur thermique pour recyclage des gaz d'echappement dans un moteur diesel

Also Published As

Publication number Publication date
FR2938298A1 (fr) 2010-05-14
FR2938298B1 (fr) 2010-11-12
EP2187015A1 (de) 2010-05-19
ATE536471T1 (de) 2011-12-15

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