EP3553304B1 - Vorrichtung zur kühlung eines durchflusses einer abgasrückführung (agr) eines verbrennungsmotors - Google Patents
Vorrichtung zur kühlung eines durchflusses einer abgasrückführung (agr) eines verbrennungsmotors Download PDFInfo
- Publication number
- EP3553304B1 EP3553304B1 EP18166599.3A EP18166599A EP3553304B1 EP 3553304 B1 EP3553304 B1 EP 3553304B1 EP 18166599 A EP18166599 A EP 18166599A EP 3553304 B1 EP3553304 B1 EP 3553304B1
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- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- valve
- exchanger module
- communication passage
- egr flow
- 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.)
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- 238000001816 cooling Methods 0.000 title claims description 68
- 238000002485 combustion reaction Methods 0.000 title claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 6
- 239000002826 coolant Substances 0.000 description 5
- 230000035882 stress Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
Images
Classifications
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- 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
- 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
- F02M26/24—Layout, e.g. schematics with two or more coolers
-
- 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
- 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
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- 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
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
- F28D7/0083—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium
- F28D7/0091—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium the supplementary medium flowing in series through the units
-
- 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
-
- 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
- F28D7/163—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 with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
- F28D7/1653—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 with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing the conduit assemblies having a square or rectangular shape
- F28D7/1661—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 with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing the conduit assemblies having a square or rectangular shape with particular pattern of flow of the heat exchange media, e.g. change of flow direction
-
- 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
- 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
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
-
- 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
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
-
- 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 present invention relates to devices for cooling an exhaust gas recirculation (EGR) flow of an internal combustion engine, of the type comprising:
- Such known devices usually include a single heat exchanger module and two valves, controllable according to the operating conditions of the engine, to vary the degree of cooling to which the EGR flow is subjected.
- such devices are able to operate in a "full cooling” condition, wherein the maximum cooling capacity of the heat exchanger module is exploited, in a condition of "partial cooling", wherein the cooling function is only partial, or in a "no cooling” condition wherein the cooling function is totally excluded.
- the first of the two valves being able to move between two different operating positions, can determine the exposure of the EGR flow to the cooling function, or the total exclusion of said cooling function.
- the second of the two valves also being able to move between two different operating positions, instead determines a partialization of the cooling function, being able to force the EGR flow to flow only through a reduced section of the single heat exchanger module, in case the first valve is in the operating position that determines the exposure of the EGR flow to the cooling function.
- the aforesaid known devices have the drawback of an uneven distribution of heat inside the heat exchanger module in the cooling" operating mode.
- the heat exchanger module can, therefore, be subjected to a non-uniform thermal field.
- This non-uniformity of the thermal field can cause deformations and/or thermal-mechanical stresses of the heat exchanger module, which can limit the resistance over time of the device for cooling the EGR flow.
- a device of the type indicated above is known from GB 2 473 821 A . Similar devices are known from DE 10 2012 011227 A1 , GB 2 453 831 A and US 2008/149080 A1 .
- the object of the present invention is to provide a device of the type indicated at the beginning of the present description, which is characterized by a structure that allows limiting the generation of non-uniform thermal fields inside the heat exchanger modules during the "partial cooling" operating mode.
- Another object of the invention is to provide more than one "partial cooling" operating mode, thus offering the possibility of varying more finely the degree of cooling to which the EGR flow can be subjected.
- Still another object of the invention is to provide a system for actuating the valve means arranged in the body of the device comprising a limited number of actuators.
- the present invention relates to a device for cooling an exhaust gas recirculation (EGR) flow having all the characteristics indicated in claim 1.
- EGR exhaust gas recirculation
- the reference number 1 indicates in its entirety a conventional cooling device for the exhaust gas recirculation (EGR) flow of an internal combustion engine.
- the device 1 comprises a body 2 with an inlet connector 2A and an outlet connector 2B.
- the connectors 2A, 2B define an inlet 3 and an outlet 4 of an in-line (or I-shaped) path inside the device.
- an in-line or "I-shaped" path means a path defined by a device having the inlet 3 and the outlet 4 located at opposite ends of the body 2 (in contrast to a "U-shaped" path).
- the device 1 thus has an in-line configuration, with the inlet 3 and the outlet 4 at opposite ends of the body 2.
- the body includes a heat exchanger module located between the inlet 3 and the outlet 4 inside a main duct 7 defined by the body 2.
- the body also includes a secondary duct 8 in parallel with the main duct 7 and, therefore, in parallel with the single heat exchanger 5.
- the secondary duct 8 thus allows "by-passing" the heat exchanger 5.
- the secondary duct 8 thus allows "by-passing" the heat exchanger 5.
- Circulation of the EGR flow is controlled by a door valve 9, pivotally connected in 10 to the body of the device, adjacent to the inlet 3.
- the door valve 9 enables the EGR to selectively flow towards the main duct 7, and therefore towards the heat exchanger 5, or towards the secondary duct 8.
- the door valve 9 of the device of Figure 1 has a first operating position, indicated with a continuous line in Figure 1 , wherein it obstructs the access to the heat exchanger 5, so that the entire EGR flow passes from the inlet 3 to the outlet 4 through the secondary duct 8 and the cooling function is completely excluded.
- the door valve 9 of the device of Figure 1 also has a second operating position, indicated by a dashed line in Figure 1 , wherein said door valve 9 completely obstructs the inlet of the secondary duct 8, so as to enable the cooling function, obtained through the passage of the entire EGR flow through the heat exchanger 5 located in the main duct 7.
- the heat exchanger 5 is usually constituted by a body including a bundle of tubes through which the EGR flow passes and that are arranged in a chamber, through which a coolant flows, typically the coolant of the internal combustion engine. To this end, the heat exchanger is inserted into the part of the engine cooling circuit that is external to the engine.
- the door valve 9 is controlled by an actuator, for example, an electrically-operated actuator, which is in turn controlled by an electronic controller on the basis of signals indicative of the operating conditions of the engine, so as to enable or disable the cooling function of the EGR flow according to these operating conditions.
- an actuator for example, an electrically-operated actuator, which is in turn controlled by an electronic controller on the basis of signals indicative of the operating conditions of the engine, so as to enable or disable the cooling function of the EGR flow according to these operating conditions.
- FIG. 2 illustrates a second device according to the prior art.
- the parts that are the same or corresponding to those of Figure 1 are indicated by the same reference numbers.
- a first door valve 9 which directs the EGR flow entering the device selectively towards the main duct 7 (and, therefore, towards the heat exchanger 5) or towards the secondary duct 8, as well as a second door valve 11, pivotally connected in 12 to the body of the device inside the main duct 7, which is able to "obstruct" a part of the bundle of tubes of the heat exchanger 5 with respect to the incoming EGR flow.
- Figures 3A and 3B schematically show the bundle of tubes 51 of the heat exchanger 5, immersed in a chamber 50 through which the engine coolant flows.
- the door valve 9 instead, analogously to that of the solution in Figure 1 , enables the arrival of the EGR flow to the heat exchanger 5, or completely excludes it, diverting the inlet flow entirely through the secondary duct 8, which represents the by-pass of the main duct 7 comprising the heat exchanger 5, so that in this condition the cooling function is totally excluded ("no cooling").
- the solution illustrated in Figure 2 is, therefore, able to obtain some form of regulation (partialization) of the cooling of the EGR flow, but has the drawback of causing undesired thermal stresses of the structure of the device, due to the non-uniform thermal field to which the heat exchanger 5 is subjected. These thermo-mechanical stresses can cause, for example, deformation of the structure of the heat exchanger 5, and limit its resistance.
- FIGS. 4A, 4B, and 4C are schematic cross-sectional views illustrating three different operating conditions of a first embodiment not forming part of the invention.
- the parts common or corresponding to the preceding figures are indicated by the same reference numbers.
- the device also has an in-line configuration with an inlet 3 and an outlet 4 at opposite ends of a body 2.
- a first and a second heat exchanger module 5, 6 are provided, arranged in series between the inlet 3 and the outlet 4, with the second heat exchanger module 6 arranged downstream of the first heat exchanger module 5, with reference to the direction of the EGR flow.
- both the heat exchangers 5, 6 are included within a main duct 7 defined by the body 2 of the device in direct correspondence with the inlet 3.
- This body also defines a secondary duct 8, in parallel with the main duct 7 (and, therefore, in parallel with both heat exchanger modules), which allows "by-passing" at least one of the heat exchangers 5, 6.
- the body 2 of the device exemplified in Figures 4A, 4B and 4C further defines a first communication passage 15 between the main duct 7 and the secondary duct 8, said first communication passage being located upstream of the first heat exchanger module 5, with reference to the direction of the EGR flow.
- the body 2 of the device defines a second communication passage 16 between the main duct 7 and the secondary duct 8, this second communication passage being located downstream of the first heat exchanger module 5 and upstream of the second heat exchanger module 6, with reference to the direction of the EGR flow.
- the inlet to each heat exchanger module can be enabled or disabled (opened or closed) by a respective door valve.
- the valve means of the device exemplified in Figures 4A, 4B and 4C comprise the door valve 9, arranged upstream of the first heat exchanger module 5 and at the first communication passage 15, which directs the EGR flow towards the first heat exchanger module 5 arranged in the main duct 7, or towards the secondary duct 8 through the first communication passage 15, and a second door valve 13 pivotally connected at the axis 14 upstream of the second heat exchanger module 6 and at the second communication passage 16, which directs the EGR flow towards the second heat exchanger module 6 arranged in the main duct 7, or towards the secondary duct 8 through the second communication passage 16.
- FIG 4A shows a first arrangement of the door valves 9, 13, corresponding to the "full cooling" operating condition of the device.
- the door valve 9 closes the first communication passage 15 between the main duct 7 and the secondary duct 8, while the door valve 13 closes the second communication passage 16.
- the EGR flow entering the device firstly flows entirely through the first upstream heat exchanger module 5, then through the second downstream heat exchanger module 6, and finally leaves the device through the outlet 4.
- FIG 4B shows a second arrangement of the door valves 9, 13, corresponding to the "partial cooling" operating condition of the device.
- the door valve 9 closes the first communication passage 15 between the main duct 7 and the secondary duct 8, while the door valve 13 obstructs the inlet of the second heat exchanger module 6 and opens the second communication passage 16.
- the EGR flow entering the device firstly flows entirely through the first heat exchanger module 5 arranged in the main duct 7, and from there it flows then into the secondary duct 8 through the communication passage 16, then leaving the device through the outlet 4, by-passing the second heat exchanger module 6.
- FIG. 4C shows a third arrangement of the door valves 9, 13, corresponding to the "no cooling" operating condition of the device.
- the door valve 9 blocks the inlet of the first heat exchanger module 5 and opens the first communication passage 15, while the door valve 13 closes the second communication passage 16.
- the EGR flow entering the device is forced to flow from the inlet 3 to the outlet 4 entirely passing through the secondary duct 8, and bypassing both heat exchanger modules 5, 6.
- the cooling function is therefore completely excluded.
- actuators M1, M2 arranged to control the operating position of the valve elements 9, 13, and an electronic controller E, which controls the actuators M1, M2 according to signals S1, S2, S3, etc. indicative of parameters that define the operating conditions of the internal combustion engine.
- These parameters can include, for example, the temperature of the engine coolant, the temperature of the engine exhaust gases, the engine rotation speed, the engine load, etc.
- the electronic controller E controls the actuators M1, M2 according to techniques well known to those skilled in the art, also on the basis of a signal indicative of the operating positions of the valve elements 9 and/or 13, or of the actuators M1 and/or M2, or any other element interposed in the transmission between the actuators M1, M2 and the respective valve elements 9, 13.
- actuators M1, M2 and this electronic controller E are not visible in Figures 4B and 4C for simplicity of illustration only. Since Figures 4B and 4C illustrate the same embodiment exemplified in Figure 4A in two additional operating conditions, it should be understood that these components M1, M2 and E are present, insofar as they are present in the embodiment exemplified in Figure 4A .
- each heat exchanger module 5, 6 is provided with a respective door valve 9, 13 located at the respective inlet.
- Each of the door valves 9, 13 can be actuated into two different positions, thus enabling the EGR to selectively flow towards the respective heat exchanger module, or towards the respective communication passage between the main duct 7 and the secondary duct 8, so as to be able to achieve three operating modes: "full cooling”, “partial cooling” and "no cooling”.
- the two heat exchanger modules 5, 6 can be equal or different (e.g. in relation to their dimensions such as length, cross-section, diameter of the tubes 51, number of the tubes 51 etc.).
- the two heat exchanger modules 5, 6 can be inserted into the same cooling circuit or into two separate cooling circuits, e.g. containing coolants with different characteristics and/or different temperatures.
- Figure 5 illustrates a variant of the first embodiment, which also does not form part of the invention.
- This variant is substantially similar to the solution of Figures 4A, 4B and 4C except that the door valve 13 can be moved into three different operating positions, instead of the two operating positions that characterize the operation of the valve 13 in the device illustrated in Figures 4A, 4B and 4C .
- This additional operating position of the door valve 13, illustrated in Figure 5 allows the "partial cooling" function to be carried out in a different manner from that illustrated in Figure 4B .
- Figure 5 shows an arrangement of the door valves 9, 13, corresponding to a second "partial cooling" operating condition, different from the one illustrated in Figure 4B .
- the door valve 9 obstructs the inlet of the first heat exchanger module 5 and opens the first communication passage 15, while the door valve 13 obstructs the secondary duct 8 downstream of the second communication passage 16.
- the EGR flow entering the device flows from the inlet 3 towards the secondary duct 8 through the first communication passage 15, then passes through the second communication passage 16 to flow through the second heat exchanger module 6, and from this it finally leaves the device through the outlet 4.
- the two heat exchanger modules 5, 6 can be different, for example, in relation to some of their geometric and/or structural characteristics, it follows that they can be characterized by different cooling capacities. Therefore, the "partial cooling 1" and “partial cooling 2" operating modes obtainable by means of the embodiment exemplified in Figure 5 can correspond to different degrees of cooling of the EGR flow, thus allowing a greater possibility of control and flexibility of use of the embodiment shown in Figure 5 with respect to the embodiment shown in Figures 4A, 4B and 4C .
- Two actuators (for example electric actuators) M1, M2 are also shown in a purely schematic way in Figure 5 , arranged for controlling the operating position of the valve elements 9, 13, and an electronic controller E, which controls the electric actuators M1, M2 as a function of signals S1, S2, S3, etc. as discussed above.
- Figures 6A , 6B and 6C illustrate an embodiment of the device according to the invention.
- the first heat exchanger module 5 is located inside the main duct 7
- the second heat exchanger module 6 is located inside the secondary duct 8.
- the body 2 of the device defines a first and a second communication passage 15, 16 between the main duct 7 and the secondary duct 8.
- the first communication passage 15 is also located upstream of the first heat exchanger module 5, with reference to the direction of the EGR flow, and the second communication passage 16 is located downstream of the first heat exchanger module 5 and upstream of the second heat exchanger module 6.
- each of the two door valves 9, 13 can be moved into three different operating positions.
- the two door valves are actuated by the same actuator M, in such a way that the respective movements are mutually linked.
- the two valves 9, 13 can rotate by the same angle, but in opposite directions.
- Figure 6A shows a first arrangement of the door valves 9, 13, corresponding to a "partial cooling" operating condition of the device.
- the door valve 9 closes the first communication passage 15 between the main duct 7 and the secondary duct 8, while the door valve 13 closes the second communication passage 16.
- the EGR flow entering the device firstly flows entirely through the first heat exchanger module 5, and from there it continues through the main duct 7 towards the outlet 4 of the device, by-passing the second heat exchanger module 6.
- Figure 6B shows a second arrangement of the door valves 9, 13, corresponding to the "no cooling" operating condition of the device.
- the door valve 9 obstructs the inlet of the first heat exchanger module 5 and opens the first communication passage 15, while the door valve 13 obstructs the inlet of the second heat exchanger module 6 and opens the second communication passage 16.
- the EGR flow entering the device flows from the inlet 3 towards the secondary duct 8 through the first communication passage 15, thus by-passing the first heat exchanger module 5, then it passes through the second communication passage 16 to flow through the main duct 7, thus by-passing the second heat exchanger module 6, and it finally leaves the device through the outlet 4.
- FIG. 6C shows a third arrangement of the door valves 9, 13, corresponding to the "full cooling" operating condition of the device.
- the door valve 9 obstructs the secondary duct 8 downstream of the first communication passage 15, while the door valve 13 obstructs the main duct 7 downstream of the second communication passage 16.
- the EGR flow entering the device firstly flows entirely through the first heat exchanger module 5 arranged in the main duct 7, and from there it then flows into the secondary duct 8 through the communication passage 16, thus passing through the second heat exchanger module 6 arranged in the secondary duct 8, then leaving the device through the outlet 4.
- an actuator e.g., an electric actuator
- an electronic controller E which controls the actuator M as a function of signals S1, S2, S3, etc.
- a device reduces the probability that the heat exchanger modules undergo deformations and/or breakages.
Claims (2)
- Vorrichtung (1) zum Kühlen eines AGR (Abgasrückführungs)-Stroms eines Verbrennungsmotors, die umfasst:- einen Körper (2) mit einem Einlass (3) und einem Auslass (4) für den AGR-Strom, der einen Hauptkanal (7) für den AGR-Strom von dem Einlass zu dem Auslass und einen Nebenkanal (8) parallel zu dem Hauptkanal bildet, wobei der Einlass (3) und der Auslass (4) sich an gegenüberliegenden Enden des Körpers (2) befinden,- ein erstes Wärmetauscher-Modul (5) und ein zweites Wärmetauscher-Modul (6) zum Kühlen des AGR-Stroms, wobei das erste Wärmetauscher-Modul (5) in dem Hauptkanal (7) angeordnet ist und das zweite Wärmetauscher-Modul (6) in Bezug auf die Richtung des AGR-Stroms stromab von dem ersten Wärmetauscher-Modul (5) liegt,- Ventileinrichtungen (9, 13), die in dem Körper (2) angeordnet sind, um den AGR-Strom durch den Hauptkanal (7) und den Nebenkanal (8) zu steuern,- einen ersten Verbindungs-Durchlass (15) zwischen dem Hauptkanal (7) und dem Nebenkanal (8), der in Bezug auf die Richtung des AGR-Stroms stromauf von dem ersten Wärmetauscher-Modul (5) liegt, und- einen zweiten Verbindungs-Durchlass (16) zwischen dem Hauptkanal und dem Nebenkanal, der in Bezug auf die Richtung des AGR-Stroms stromab von dem ersten Wärmetauscher-Modul (5) und stromauf von dem zweiten Wärmetauscher-Modul (6) liegt,- wobei die Ventileinrichtungen umfassen:- ein erstes Ventil (9), das stromauf von dem ersten Wärmetauscher-Modul (5) angeordnet ist und wenigstens eine erste Funktionsposition, in der das erste Ventil den ersten Verbindungs-Durchlass (15) schließt, und eine zweite Funktionsposition hat, in der das erste Ventil den Einlass des ersten Wärmetauscher-Moduls (5) sperrt, sowie
ein zweites Ventil (13), das stromauf von dem zweiten Wärmetauscher-Modul (6) angeordnet ist und wenigstens eine erste Funktionsposition, in der das zweite Ventil den zweiten Verbindungs-Durchlass (16) schließt, und eine zweite Funktionsposition hat, in der das zweite Ventil den Einlass des zweiten Wärmetauscher-Moduls (6) sperrt,
wobei die Vorrichtung des Weiteren Einrichtungen umfasst, mit denen das erste Ventil (9) und das zweite Ventil (13) so gesteuert werden, dass sie den AGR-Strom entweder durch beide Wärmetauscher-Module oder nur durch eines der zwei Wärmetauscher-Module oder über einen Weg leiten, der weder durch das erste Wärmetauscher-Modul noch durch das zweite Wärmetauscher-Modul verläuft,
wobei
das zweite Wärmetauscher-Modul (6) in dem Nebenkanal (8) enthalten ist,- das erste Ventil (9) eine dritte Funktionsposition hat, in der es den Nebenkanal (8) stromab von dem ersten Verbindungs-Durchlass (15) sperrt, und- das zweite Ventil (13) eine dritte Funktionsposition hat, in der es den Hauptkanal (7) stromab von dem zweiten Verbindungs-Durchlass (16) sperrt,und zwar so, dass:- in einer ersten Funktionskonfiguration der Ventile (9, 13) das erste Ventil (9) den ersten Verbindungs-Durchlass (15) schließt und das zweite Ventil (13) den zweiten Verbindungs-Durchlass (16) schließt, so dass der AGR-Strom nur durch das erste Wärmetauscher-Modul (5) geleitet wird,- in einer zweiten Funktionskonfiguration der Ventile (9, 13) das erste Ventil (9) den Einlass des ersten Wärmetauscher-Moduls (5) sperrt und das zweite Ventil (13) den Einlass des zweiten Wärmetauscher-Moduls (6) sperrt, so dass der AGR-Strom über einen Weg geleitet wird, der weder durch das erste Wärmetauscher-Modul (5) noch durch das zweite Wärmetauscher-Modul (6) verläuft, und- in einer dritten Funktionskonfiguration der Ventile (9, 13) das erste Ventil (9) den zweiten Kanal (8) stromab von dem ersten Verbindungs-Durchlass (15) sperrt und das zweite Ventil (13) den Hauptkanal (7) stromab von dem zweiten Verbindungs-Durchlass (16) sperrt, so dass der AGR-Strom durch den Hauptkanal (7) und durch das erste Wärmetauscher-Modul (5) und dann durch den zweiten Verbindungs-Durchlass (16) in den Nebenkanal (8) hinein und durch das zweite Wärmetauscher-Modul (6) geleitet wird. - Vorrichtung nach Anspruch 1, wobei die Einrichtungen zum Steuern des ersten Ventils (9) und des zweiten Ventils (13) ein Stellglied (M), eine elektronische Steuerung (E) zum Steuern des Stellgliedes (M) sowie einen kinematischen Mechanismus (L) umfassen, der die Bewegungen des ersten Ventils (9) und des zweiten Ventils (13) miteinander koppelt.
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