EP1405991B1 - Circuit de refroidissement pour un moteur à combustion interne de véhicule - Google Patents

Circuit de refroidissement pour un moteur à combustion interne de véhicule Download PDF

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Publication number
EP1405991B1
EP1405991B1 EP03022278A EP03022278A EP1405991B1 EP 1405991 B1 EP1405991 B1 EP 1405991B1 EP 03022278 A EP03022278 A EP 03022278A EP 03022278 A EP03022278 A EP 03022278A EP 1405991 B1 EP1405991 B1 EP 1405991B1
Authority
EP
European Patent Office
Prior art keywords
circuit
circuit branch
engine
branch
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.)
Expired - Fee Related
Application number
EP03022278A
Other languages
German (de)
English (en)
Other versions
EP1405991A1 (fr
Inventor
Roberto Cipollone
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.)
Sogefi Air and Cooling SAS
Original Assignee
Mark IV Systemes Moteurs SAS
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 Mark IV Systemes Moteurs SAS filed Critical Mark IV Systemes Moteurs SAS
Publication of EP1405991A1 publication Critical patent/EP1405991A1/fr
Application granted granted Critical
Publication of EP1405991B1 publication Critical patent/EP1405991B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/021—Cooling cylinders
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/024—Cooling cylinder heads
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/028—Cooling cylinders and cylinder heads in series
    • 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
    • F01P2007/143—Controlling of coolant flow the coolant being liquid using restrictions
    • 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
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves

Definitions

  • the present invention relates to a vehicle internal combustion engine cooling circuit.
  • internal combustion engines of vehicles and motor vehicles in particular, comprise an engine block defining the cylinders; and a cylinder head fixed to the engine block, and which defines the combustion chambers of the cylinders and houses the valves and relative control members.
  • Known engines are normally water-cooled, or rather by a coolant comprising a mixture of water and additives; and the cooling circuit normally comprises a cooling line inside the engine, defined by a number of channels formed in the engine block and cylinder head and communicating with one another through openings in the cylinder head seal.
  • the engine cooling line is known to comprise a first circuit branch for cooling the cylinder head; and a second circuit branch for cooling the engine block, and which is connected in series with and downstream from the first.
  • known cooling circuits the same amount of coolant flows through the cylinder head and the engine block, and, even with the above series arrangement of the circuit branches, it is impossible to obtain any great difference in temperature between the cylinder head and the engine block.
  • JP-A-58008222 discloses a cooling circuit according to the preamble of claim 1. It is preferable to make such circuit as compact as possible such that the advantages of an efficient cooling have a low impact on the available volume under the bonnet. Furthermore, it is preferable to simplify the interface between the engine and the cooling circuit.
  • Number 1 in the accompanying diagram indicates as a whole a cooling circuit for an internal combustion engine 2 of a motor vehicle.
  • Engine 2 comprises, in known manner, a cylinder head 3 and an engine block 4; and cylinder head 3 is fitted to engine block 4, in known manner not shown, with the interposition of a seal.
  • Cooling circuit 1 substantially comprises a tank 5; a cooling line 6 for cooling engine 2; a coolant circulating pump 7 in series with line 6; a known thermostatic distributor 8 having an inlet 9 connected to the cooling line, and a number of outlets 10, 11, 12; and a number of return lines 14, 15, 16 connecting respective outlets 10, 11, 12 of distributor 8 to tank 5.
  • Lines 14, 15, 16 are shown and described purely by way of example, may differ in number and configuration, and do not form part of the present invention.
  • One of the return lines (14) comprises, in known manner, a radiator 17 for heat exchange with an air stream, which may be natural, i.e. produced simply by the speed of the vehicle with respect to the outside air, and/or forced with the aid of a fan 18 facing radiator 17.
  • Another return line (15) supplies auxiliary user devices, indicated as a whole by 19, such as an exchanger for heating the passenger compartment, and an exchanger for cooling recirculated exhaust gas (EGR).
  • the third return line (16) is a bypass line.
  • Coolant distribution between return lines 14, 15, 16 by thermostatic distributor 8 may be effected in any known manner, and is not described by not forming part of the invention.
  • Cooling line 6 comprises a first circuit branch 23 for cooling cylinder head 3, and having an inlet 24 connected to tank 5, and an outlet 25; and a second circuit branch 26 for cooling engine block 4, and having an inlet 27 connected to outlet 25 of first circuit branch 23, and an outlet 28 connected to distributor 8.
  • circuit 1 comprises a feedback line 29 connecting outlet 28 of second circuit branch 26 to inlet 27 of the second circuit branch.
  • feedback line 29 comes out inside a mixing node 30 located between outlet 25 of first circuit branch 23 and inlet 27 of second circuit branch 26, and conveniently defined by a mixing chamber 30, which may be external to the engine or, preferably, formed in the casing, e.g. in engine block 4.
  • a valve 31 e.g. a proportional valve, is located along feedback line 29 to regulate coolant flow back to the mixing chamber.
  • pump 7 is located downstream from mixing chamber 30, between mixing chamber 30 and inlet 27 of the second circuit branch.
  • Cooling circuit 1 operates as follows.
  • circuit branch 23 of cylinder head 3 and 26 of engine block 4 receive the same amount of coolant, so that circuit 1 operates in the normal way, with very little difference in temperature between cylinder head 3 and engine block 4.
  • valve 31 When valve 31 is opened at least partly, a fraction of the coolant flow from second circuit branch 26 of engine block 4 is fed back to mixing chamber 30, where it mixes with the coolant from first circuit branch 23, so that the temperature of the coolant at inlet 27 of second circuit branch 26 is higher than it would be in a conventional circuit, i.e. with no feedback line 29.
  • valve 31 By regulating the opening of valve 31, it is therefore possible to obtain a predetermined difference in temperature between the coolant in first circuit branch 23 and in second circuit branch 26, and therefore a given difference in (mean) temperature between the engine block and cylinder head.
  • Valve 31 may be controlled, e.g. on the basis of values memorized beforehand in an electronic central control unit, as a function of the main operating variables measurable on the engine (cylinder head or engine block outflow coolant temperature, metal temperature, engine power output, etc..), so that the valve can be opened or closed by a straightforward electronic control.
  • first and second circuit branch 23, 26 alongside variations in the opening of valve 31, and therefore in coolant feedback, and the corresponding difference in mean temperature between cylinder head 3 and engine block 4 are shown in the Table below: Flow [l/min] Temperature [°C] Cyl. head Engine block Mean block-head difference Q23 Q26 T24 T25 T27 T28 115 115 119 122 123 130 6 115 100 117 121 123 130 8 115 80 114 119 123 130 10 115 50 104 112 123 130 19 115 30 87 101 123 130 33 where:
  • cooling circuit 1 According to the present invention will be obvious from the foregoing description.
  • Pump 7 downstream from mixing chamber 30 provides for establishing in cooling line 6 and feedback line 29 the pressures required for ensuring correct flow direction; and location of pump 7 upstream, as opposed to downstream, from second circuit branch 26 enables pump 7 to operate at a lower temperature (T27 as opposed to T28 in the Table) and therefore in conditions less subject to cavitation.
  • valve 31 may be controlled on the basis of a, possibly self-adapting, mathematical model.
  • valve 31 may be replaced by a fixed-section constriction of line 29, when flow along line 29 in the form of a fixed fraction of flow from second circuit branch 26 is acceptable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Organic Insulating Materials (AREA)
  • Plural Heterocyclic Compounds (AREA)

Claims (7)

  1. Circuit de refroidissement pour un moteur à combustion interne de véhicule (2), comprenant une première branche de circuit (23) pour refroidir une tête de cylindre (3) dudit moteur (2) ; et une deuxième branche de circuit (26) pour refroidir un bloc moteur (4) dudit moteur (2) ; lesdites première et deuxième branches de circuit (23, 26) étant en série l'une vis - à - vis de l'autre ; un exutoire ou une sortie de la première branche de circuit (23) étant connecté avec une admission (27) de ladite deuxième branche de circuit (26) ; une ligne de retour (29) connectant un exutoire (28) de ladite deuxième branche de circuit (26) avec ladite admission (27) de ladite deuxième branche de circuit (26), et un noeud de brassage (30) connecté avec ledit exutoire (25) de ladite première branche de circuit (23) et avec ladite ligne de retour (29), dans lequel ledit noeud de brassage est défini par une chambre de brassage (30), ledit circuit étant caractérisé en ce que ladite chambre de brassage (30) est formée dans ledit moteur (2).
  2. Circuit selon la revendication 1, caractérisé en ce qu'il comprend des moyens (31) pour commander le débit de refroidisseur le long de ladite ligne de retour (29).
  3. Circuit selon la revendication 2, caractérisé en ce que lesdits moyens pour commander le débit de refroidisseur le long de ladite ligne de retour (29) comprennent une vanne régulatrice de débit (31).
  4. Circuit selon la revendication 1, caractérisé en ce que ladite ligne de retour (29) comprend un rétrécissement fixe.
  5. Circuit selon l'une des revendications précédentes, caractérisé en ce qu'il comprend une pompe de circulation (7) en aval de ladite première branche de circuit (23).
  6. Circuit selon la revendication 5, caractérisé en ce que ladite pompe de circulation (7) est interposée entre ladite première branche de circuit (23) et ladite deuxième branche de circuit (26).
  7. Circuit selon l'une des revendications précédentes, caractérisé en ce que ladite pompe de circulation (7) est située entre ledit noeud de brassage (30) et ladite deuxième branche de circuit (26).
EP03022278A 2002-10-02 2003-10-01 Circuit de refroidissement pour un moteur à combustion interne de véhicule Expired - Fee Related EP1405991B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20020853 2002-10-02
IT000853A ITTO20020853A1 (it) 2002-10-02 2002-10-02 Circuito di raffredamento di un motore a combustione interna per un

Publications (2)

Publication Number Publication Date
EP1405991A1 EP1405991A1 (fr) 2004-04-07
EP1405991B1 true EP1405991B1 (fr) 2008-12-10

Family

ID=31986059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03022278A Expired - Fee Related EP1405991B1 (fr) 2002-10-02 2003-10-01 Circuit de refroidissement pour un moteur à combustion interne de véhicule

Country Status (4)

Country Link
EP (1) EP1405991B1 (fr)
AT (1) ATE417191T1 (fr)
DE (1) DE60325150D1 (fr)
IT (1) ITTO20020853A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4497082B2 (ja) * 2005-11-17 2010-07-07 トヨタ自動車株式会社 エンジンの冷却媒体循環装置
EP2562378B1 (fr) * 2011-08-23 2015-10-14 Ford Global Technologies, LLC Stratégie de fonctionnement d'un circuit d'agent réfrigérant séparé
EP2562379B1 (fr) * 2011-08-23 2015-10-14 Ford Global Technologies, LLC Circuit d'agent réfrigérant
US8739745B2 (en) 2011-08-23 2014-06-03 Ford Global Technologies, Llc Cooling system and method
US10866603B2 (en) 2014-10-21 2020-12-15 Ford Global Technologies, Llc Wax thermostat
JP2016094871A (ja) * 2014-11-13 2016-05-26 トヨタ自動車株式会社 シリンダブロック
SE540433C2 (en) * 2017-01-26 2018-09-18 Scania Cv Ab A cooling system for cooling a combustion engine and a vehicle comprising such a cooling system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176316A (en) * 1981-04-23 1982-10-29 Toyota Motor Corp Cooling equipment for engine
JPS588222A (ja) * 1981-07-03 1983-01-18 Toyota Motor Corp エンジンの冷却装置

Also Published As

Publication number Publication date
ITTO20020853A1 (it) 2004-04-03
EP1405991A1 (fr) 2004-04-07
ATE417191T1 (de) 2008-12-15
DE60325150D1 (de) 2009-01-22

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