EP2719885A1 - Agencement de refroidissement des gaz d'échappement dans un moteur à combustion interne - Google Patents

Agencement de refroidissement des gaz d'échappement dans un moteur à combustion interne Download PDF

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Publication number
EP2719885A1
EP2719885A1 EP12188094.2A EP12188094A EP2719885A1 EP 2719885 A1 EP2719885 A1 EP 2719885A1 EP 12188094 A EP12188094 A EP 12188094A EP 2719885 A1 EP2719885 A1 EP 2719885A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
coolant fluid
egr
arrangement
heat exchange
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
Application number
EP12188094.2A
Other languages
German (de)
English (en)
Other versions
EP2719885B1 (fr
Inventor
Saeed Sohrabi
Mats Morén
Sassan Marandi
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.)
Volvo Car Corp
Original Assignee
Volvo Car Corp
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 Volvo Car Corp filed Critical Volvo Car Corp
Priority to EP12188094.2A priority Critical patent/EP2719885B1/fr
Publication of EP2719885A1 publication Critical patent/EP2719885A1/fr
Application granted granted Critical
Publication of EP2719885B1 publication Critical patent/EP2719885B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass

Definitions

  • the invention relates to an arrangement for cooling exhaust gases for exhaust gas recirculation (EGR) in an internal combustion engine.
  • the arrangement comprises a coolant fluid circuit comprising a coolant radiator and a coolant fluid pump.
  • the arrangement further comprises an EGR heat exchanger comprising a heat exchanger casing. At least one exhaust gas passage for allowing exhaust gases to pass through the EGR heat exchanger and at least one coolant fluid passage for allowing coolant fluid to pass through the EGR heat exchanger allows heat transfer to take place between the exhaust gases and the coolant fluid.
  • EGR exhaust gas recirculation
  • the object of the present invention is to provide an attachment arrangement for a vehicle where the previously mentioned problem is avoided. This object is achieved by the features of the characterising portion of claim 1.
  • the invention relates to an arrangement for cooling exhaust gases for exhaust gas recirculation (EGR) in an internal combustion engine.
  • the arrangement comprises a coolant fluid circuit comprising a coolant radiator and a coolant fluid pump.
  • the arrangement further comprises an EGR heat exchanger comprising a heat exchanger casing. At least one exhaust gas passage for allowing exhaust gases to pass through the EGR heat exchanger and at least one coolant fluid passage for allowing coolant fluid to pass through the EGR heat exchanger enables heat transfer to take place between the exhaust gases and the coolant fluid.
  • the EGR heat exchanger comprises an inlet and an outlet connected to the coolant fluid circuit.
  • the EGR heat exchanger further comprises a heat exchange section and a bypass section.
  • the heat exchange section comprises the at least one exhaust gas passage and the at least one coolant fluid passage.
  • the heat exchange section and the bypass section is in fluid connection with each other through at least one heat exchange opening, such that a predetermined flow of coolant fluid through the heat exchange section is determined by the area of the at least one heat exchange opening.
  • One advantage with an arrangement according to the invention is that the arrangement can be made smaller due to that the temperature in the EGR heat exchanger can be lower than in a conventional cooling arrangement where the coolant fluid is connected to the EGR heat exchanger via tubes from the coolant circuit.
  • the fact that the EGR heat exchanger is directly connected to the coolant fluid circuit allows for a higher flow of coolant fluid through the EGR heat exchanger thereby allowing for a reduction in operating temperature of the EGR heat exchanger.
  • Another advantage is that the tubes normally supplying the EGR heat exchanger with coolant fluid are made unnecessary as the EGR heat exchanger and the coolant fluid circuit are in direct contact with each other. This leads to a reduction in assembly cost and procurement cost. Further, as both the EGR heat exchanger is smaller and the tubes are removed it is possible to save installation space for the EGR heat exchanger. This leads to that other equipment can be placed in the engine compartment or that the engine compartment can be made smaller while still maintaining the same functionality.
  • An arrangement according to the invention can be beneficial for both petrol and diesel engines.
  • a diesel engine the temperature of the gases out from the engine can be lowered due to an increased flow through the coolant circuit and by having a lower temperature of the fluid that enters the EGR heat exchanger. This leads to reduced NOx emissions and lower fuel consumption.
  • the coolant fluid can be heated by the exhaust gases during a cold start by using the heat in the exhaust gases, thereby reducing the time it takes to warm the engine to a proper operating temperature.
  • the heat exchange opening can be regulated to extend from between 0 % - 100 % of a bottom area of the EGR heat exchanger.
  • the regulation can be made either automatically, i.e. by the vehicle's electronic control unit (ECU) or manually by the driver as a response to an indication that the flow of coolant fluid is not optimal.
  • ECU electronice control unit
  • the EGR heat exchanger can be made to fit on the coolant fluid circuit such that the heat exchange opening may be equipped with a valve that can be regulated such that the bottom area of the EGR heat exchanger can be opened towards the bypass section from between 0 % and 100 %. This means that at 0 % opening no coolant fluid passes through the EGR heat exchanger and that at 100 % opening the entire coolant fluid flow passes through the EGR heat exchanger.
  • a control valve is installed in the front of or in the rear of the coolant radiator. The flow of coolant fluid through the EGR heat exchanger is controlled by the design of the heat exchanger.
  • the heat exchange opening may extend along the whole length of the EGR heat exchanger.
  • the bypass section may have a reduced cross section area over the length of the coolant fluid pipe where the coolant fluid pipe and the EGR cooler are connected.
  • One advantage of having a reduced cross section area of the bypass section is that the flow velocity through the EGR heat exchanger thus can be increased.
  • the cross section area of the bypass section can be chosen such that a desired maximum flow velocity can be achieved when heat exchange opening of the EGR heat exchanger is maximally open towards the bypass section.
  • the coolant fluid pump may be located upstream of inlet of the EGR heat exchanger or the coolant fluid pump may be located downstream of the outlet of the EGR heat exchanger.
  • the placement of the coolant fluid pump is dependent on where there is room for the coolant fluid pump in the engine compartment. This means that the coolant fluid pump may be located either on the suction side of the coolant fluid circuit or on the pressure side of the coolant fluid circuit.
  • the EGR heat exchanger may be straight or the EGR heat exchanger may be U-shaped, bent or curved. Depending on the shape of the EGR heat exchanger the EGR heat exchanger can fit on different configurations of engines. Different shapes may also allow for a more flexible mounting position of the EGR heat exchanger depending on the amount of space available in the engine compartment.
  • the EGR heat exchanger casing may be made of plastic.
  • the EGR heat exchanger casing may be made of any suitable material such as a metal, a metal alloy or plastic.
  • One advantage with arrangement according to the invention is that the reduced temperature in the EGR heat exchanger due to the higher flow of coolant fluid allows the EGR heat exchanger casing to be made of plastic. This reduces both the weight and the cost of the EGR heat exchanger.
  • the at least one exhaust gas passage of the EGR cooler may be made of steel or aluminium.
  • the at least one exhaust gas passage is preferably made of metal, for instance steel or aluminium.
  • the passages can be enclosed in an EGR heat exchanger casing made as described above.
  • a vehicle may comprise an arrangement according to the invention.
  • FIG. 1 schematically shows a cross section view of an arrangement 1 for cooling exhaust gases in an internal combustion engine according to the invention.
  • the arrangement 1 comprises a coolant fluid circuit 2 comprising a coolant radiator (not shown) and a coolant fluid pump (not shown).
  • the arrangement 1 further comprises an EGR heat exchanger 3 comprising a heat exchanger casing 4, five exhaust gas passages 5 for allowing exhaust gases to pass through the EGR heat exchanger 3 and four coolant fluid passages 6 for allowing coolant fluid to pass through the EGR heat exchanger 3.
  • Heat transfer in the EGR heat exchanger 3 takes place between the exhaust gases and the coolant fluid resulting in that the exhaust gases passing through the exhaust gas passages 5 are cooled by the coolant fluid passing through coolant fluid passages 6.
  • the EGR heat exchanger 3 comprises an inlet 7 and an outlet 8 connected to the coolant fluid circuit 2.
  • the EGR heat exchanger 3 further comprises a heat exchange section 9 and a bypass section 10.
  • the heat exchange section 9 comprises a number of exhaust gas passages 5 and a number of coolant fluid passages 6.
  • the heat exchange section 9 and the bypass section 10 are in fluid connection with each other through one heat exchange opening 11, such that a predetermined flow of coolant fluid through the heat exchange section 9 is determined by the area of the heat exchange opening 11.
  • the heat exchange opening 11 may be one complete opening or a number of separate openings depending on the design of the heat exchange section 9 and the bypass section 10.
  • the heat exchange section 9 is connected to an EGR circuit (not shown in figure 1 ) which circulates exhaust gases from the engine to the EGR heat exchanger 3.
  • the exhaust gases passes through the EGR heat exchanger 3 through the exhaust gas passages 5 in the heat exchange section 9.
  • the bypass section 10 is part of the coolant fluid circuit 2 and is arranged to be able to support the full flow of coolant fluid even if no coolant fluid passes through the coolant fluid passages 6 of the EGR heat exchanger 3.
  • the heat exchange section 9 of the EGR heat exchanger 3 shows five exhaust gas passages 5.
  • the number of exhaust gas passages 5 is intended to show one example only, the number may be varied depending on the desired flow of exhaust gases through the heat exchange section 9 and the desired cooling of the exhaust gases.
  • the number of coolant fluid passages 6 depend on the number of exhaust gas passages 5 this is also only meant as an example.
  • the coolant fluid is arranged to enter the EGR heat exchanger 3 from the left side of the EGR heat exchanger 3 as seen in figure 1 , while the exhaust gases are arranged to enter from the right of the EGR heat exchanger 3. Further, in figure 1 the EGR valve 12 is shown.
  • the EGR valve 12 regulates the flow of EGR through the EGR circuit.
  • the placement of the EGR valve 12 is merely illustrative. Entry of the coolant fluid and exhaust gases from the opposite sides is of course possible depending on the design of the arrangement 1.
  • the coolant fluid and exhaust gases may also enter from the same side of the EGR heat exchanger 3, either the left or the right side.
  • Figure 2 schematically shows an isometric view of an arrangement 1 for cooling exhaust gases in an internal combustion engine according to the invention.
  • a more detailed layout of the arrangement 1 is shown.
  • one possible layout of the arrangement 1 is shown.
  • the coolant fluid circuit 2 and the EGR circuit 13 are shown in figure 2 .
  • the heat exchange section 9 and the bypass section 10 are also shown in order to clearer indicate the separate parts of the EGR heat exchanger 3.
  • the invention is capable of modification in various obvious respects, all without departing from the scope of the appended claims. Accordingly, the drawings and the description thereto are to be regarded as illustrative in nature, and not restrictive.
  • shape of the EGR heat exchanger can be made in various shapes to fit different engine designs, such as for instance U-shaped, bent or curved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP12188094.2A 2012-10-11 2012-10-11 Agencement de refroidissement des gaz d'échappement dans un moteur à combustion interne Active EP2719885B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12188094.2A EP2719885B1 (fr) 2012-10-11 2012-10-11 Agencement de refroidissement des gaz d'échappement dans un moteur à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12188094.2A EP2719885B1 (fr) 2012-10-11 2012-10-11 Agencement de refroidissement des gaz d'échappement dans un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2719885A1 true EP2719885A1 (fr) 2014-04-16
EP2719885B1 EP2719885B1 (fr) 2016-12-14

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ID=47002755

Family Applications (1)

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EP12188094.2A Active EP2719885B1 (fr) 2012-10-11 2012-10-11 Agencement de refroidissement des gaz d'échappement dans un moteur à combustion interne

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EP (1) EP2719885B1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11351074A (ja) * 1998-06-05 1999-12-21 Usui Internatl Ind Co Ltd Ｅｇｒガス冷却装置
EP1548267A1 (fr) * 2002-10-02 2005-06-29 Hino Motors, Ltd. Refroidisseur pour recirculation des gaz d'echappement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11351074A (ja) * 1998-06-05 1999-12-21 Usui Internatl Ind Co Ltd Ｅｇｒガス冷却装置
EP1548267A1 (fr) * 2002-10-02 2005-06-29 Hino Motors, Ltd. Refroidisseur pour recirculation des gaz d'echappement

Also Published As

Publication number Publication date
EP2719885B1 (fr) 2016-12-14

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