• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to an arrangement for recirculating exhaust gases of a single-combustion engine (2) in a vehicle (1). The arrangement comprises an exhaust line (4) which is intended to discharge exhaust gases from the internal combustion engine (2) and a return line (5) which is adapted to recirculate a part of the exhaust gases in the exhaust line (4) of the internal combustion engine (2). The arrangement also comprises a high temperature cooling system (11) comprising a circulating coolant consisting of a liquid medium which at a designated operating pressure in the high temperature cooling system (11) has a boiling temperature of at least 150 ° C, an EGR cooler (10) for cooling the recirculating exhaust gases in the return line ( 5) in a first step by means of the circulating high-temperature coolant and a cooler element (13) where the high-temperature coolant is adapted to be cooled by air. (riga 1)
    公开号:SE0802349A1
    申请号:SE0802349
    申请日:2008-11-05
    公开日:2010-05-06
    发明作者:Hans Wikstroem
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    The cooling system thus has high load peaks at times when the internal combustion engine is heavily loaded. In heavy vehicles, the internal combustion engine cooling system is generally also used for other cooling needs in the vehicle, such as, for example, cooling of the oil in a hydraulic retarder. It is therefore desirable to reduce the load on the internal combustion engine cooling system. SUMMARY OF THE INVENTION The object of the present invention is to provide an arrangement in which an efficient cooling of recirculating exhaust gases of an internal combustion engine can be obtained in a first step.
    This seam is achieved with the arrangement of the kind mentioned in the introduction, which is characterized by the features stated in the characterizing part of claim 1. Thus, according to the invention, a high temperature cooling system is used with a circulating coolant having a significantly higher boiling temperature than the coolant circulating in a conventional cooling system for cooling an internal combustion engine.
    The high temperature cooling system comprises an EGR cooler where the exhaust gases in the return line are cooled by the circulating coolant and a cooler element where the coolant is cooled by air.
    One way to raise the boiling temperature of a coolant in a cooling system is to raise the pressure in the cooling system. An easier way is to use a cooling medium that has a clearly higher boiling point than water. The recirculating exhaust gases can have a temperature of up to 600 ° C. Thus, the coolant in the high-temperature cooling system must have a relatively high boiling point so that it does not evaporate as it cools the exhaust gases in the EGR cooler. The coolant in the high temperature cooling system should therefore have at least a boiling temperature of 150 ° C and preferably a boiling temperature above 300 ° C. Heat transfer liquids with a high boiling point are commercially available. Such liquids are usually oils of various kinds. An example of such a heat transfer fluid is XCELTHERM® which has a boiling point of 400 ° C at atmospheric pressure. Such a heat transfer fluid with a suitable boiling point can be advantageously used in the high temperature cooling system to cool the recirculating exhaust gases in the EGR cooler. Since the recirculating exhaust gases have such a high temperature, they obtain a good cooling even with a coolant which has a relatively high temperature. The coolant in the high-temperature cooling system can, for example, have a temperature of approximately 150 ° C when it is led into the EGR cooler. With such a high temperature cooling system, an efficient cooling of the recirculating exhaust gases can be obtained in a first step. According to a preferred embodiment of the present invention, the radiator element of the high temperature cooling system is arranged in an area adapted to flow through air, in a position downstream of a radiator element of a cooling system adapted to cool the internal combustion engine. The coolant in the internal combustion engine cooling system is normally cooled in a radiator element which is arranged in an area at a front part of a vehicle. In this case, the radiator element of the high-temperature cooling system is thus arranged at the front portion behind the radiator element of the cooling system of the internal combustion engine. Thereby, the radiator element of the high-temperature cooling system is passed through by lye which has already passed through and been heated in the radiator element of the internal combustion engine cooling system. Since the coolant in the high temperature cooling system has a higher temperature than the coolant in the internal combustion engine cooling system, this relatively hot air can still provide efficient cooling of the coolant in the high temperature cooling system. a cooling air flow through the radiator elements. With such a placement of the cooler element of the high-temperature cooling system, it is flowed through by an abundant lye fl which cools the coolant in the high-temperature cooling system. In this case, an already existing air gap can thus be used to cool the coolant in the high-temperature cooling system.
    According to another embodiment of the invention, the high-temperature cooling system comprises a separate radiator som which is arranged in connection with the radiator element, which is adapted to generate a cooling leach current through the radiator element. With such a separate radiator fan, it is possible to mount the radiator element of the high-temperature cooling system in a substantially arbitrary position in the vehicle. Advantageously, the radiator element of the high-temperature cooling system is arranged in an interior area of the vehicle, which is located adjacent to the internal combustion engine. Thus, the lines of the high temperature cooling system in which the coolant is circulated can be made relatively short. The radiator element of the high temperature cooling system may be attached to the internal combustion engine. Thus, the lines circulating the coolant in the high temperature cooling system can be made very short. The cooler element of the high temperature cooling system can here be directly or indirectly fixed on the internal combustion engine by means of suitable fastening elements.
    According to another preferred embodiment of the invention, the arrangement comprises at least one further EGR cooler for cooling the recirculating exhaust gases in at least one further step before they are led to the internal combustion engine.
    The high-temperature cooling system, which has a coolant with a relatively high temperature, is generally unable to cool the recirculating exhaust gases to a desired low temperature.
    The recirculating exhaust gases should therefore be further cooled before being led to the internal combustion engine. The recirculating exhaust gases may be adapted to be cooled in an additional EGR cooler by the coolant from the internal combustion engine cooling system. The coolant in the cooling system of the internal combustion engine has a temperature of 80-100 ° C during normal operation.
    The coolant in the internal combustion engine cooling system has a lower temperature than the coolant in the high temperature cooling system. It is thus possible to use the coolant in the cooling system of the internal combustion engine to cool the recirculating exhaust gases in a second stage. Since the recirculating exhaust gases have already been cooled in a first stage of the high-temperature cooling system, a relatively moderate load on the cooling system of the internal combustion engine is obtained in this case. The recirculating exhaust gases are advantageously cooled in a third step to obtain a desired low temperature. The recirculating exhaust gases can then be cooled in an additional EGR cooler of coolant from a low-temperature cooling system where the coolant is adapted to have a lower temperature than the coolant in the cooling system of the internal combustion engine. This low-temperature cooling system advantageously comprises a cooler element where the coolant in the cooling system is cooled by lu fi of the ambient temperature. Thus, the coolant in the low temperature cooling system can obtain a temperature close to the ambient temperature. This enables cooling of the exhaust gases to a desired low temperature. Alternatively, the exhaust gases can be cooled in this step by a closed EGR cooler. In this case, the recirculating exhaust gases are advantageously cooled by air at ambient temperature.
    BRIEF DESCRIPTION OF THE DRAWINGS A In the following, by way of example, preferred embodiments of the invention are described with reference to the accompanying drawings, in which: Figs. Fig. 1 shows an arrangement of a supercharged diesel engine according to a first embodiment of the invention and Fig. 2 shows an arrangement of a supercharged diesel engine according to a second embodiment of the invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION Fig. 1 shows an arrangement of an internal combustion engine 2 which is adapted to drive a schematically shown vehicle 1. The internal combustion engine is exemplified here as a diesel engine 2. for a heavier vehicle l.
    The exhaust gases from the cylinders of the diesel engine 2 are led, via an exhaust collector 3, to an exhaust line 4. The arrangement comprises a return line 5 to provide a recirculation of some of the exhaust gases in the exhaust line 4. The return line 5 has a distance between the exhaust line 4 and an inlet line 6 for compressed air to the internal combustion engine 2. The diesel engine 2 is thus in this case supercharged. The return line 5 comprises an EGR valve 7, with which the exhaust gas in the return line 5 can be switched off. The EGR valve 7 can also be used to steplessly control the amount of exhaust gases fed to the internal combustion engine 2. A control unit 8 is adapted to control the EGR valve 7 with information about the current operating state of the diesel engine 2. The recirculating exhaust gases from the return line 5 are mixed with the compressed air in the inlet line 6 by means of a mixing device 9. In supercharged diesel engines 2, during certain operating conditions, the exhaust gas pressure in the exhaust line 4 is lower than the compressed air pressure in the inlet line 6. it is not possible to directly mix the exhaust gases in the return line 5 with the compressed air in the inlet line 6 without special aids. In this case, for example, a turbocharger with a variable geometry can be used. If the internal combustion engine 2 is instead an overcharged otto engine, the exhaust gases in the return line 5 can be led directly into the inlet line 6 as the exhaust gases in the exhaust line 4 of an otto engine have a higher pressure than the compressed air in the inlet line 6.
    The arrangement comprises a high-temperature cooling system 11 with a circulating coolant which consists of a cooling medium which at a intended operating pressure in the cooling system has a boiling temperature of at least 150 ° C. The high temperature cooling system 11 comprises an EGR cooler 10 where the recirculating exhaust gases in the return line 5 are adapted to be cooled in a first step. The recirculating exhaust gases introduced into the EGR cooler 10 can have a temperature of up to 600 ° C. The coolant in the high temperature cooling system should have such a high boiling temperature that it does not risk starting to evaporate in the cooling system as it cools the recirculating exhaust gases in the EGR cooler 10. A coolant with a boiling temperature above 300 ° C can be used in this case. The coolant in the high pressure system II may be an oil which has good heat transfer properties. A coolant pump 12 circulates the coolant in the high temperature cooling system 11. The high temperature cooling system 11 comprises a cooler element 13 for cooling the coolant. The radiator element 13 is located in an area A of the vehicle 1 where it is flowed through by a cooling air stream during operation of the internal combustion engine 2.
    The internal combustion engine 2 is cooled in a conventional manner by a cooling system 14 which comprises a circulating coolant. A coolant pump 15 circulates the coolant in the internal combustion engine cooling system 14. After the coolant. circulated through the internal combustion engine 2, it is led in a line 16 to a thermostat 17. In cases where the coolant has reached a normal operating temperature, the thermostat 17 is adapted to direct the coolant to a cooler element 18, which is mounted in area A in a position in front of the cooler element 13 in the high temperature cooling system. 11. A radiator 28 is adapted to generate a cooling air flow through the radiator elements 13, 18 during operation of the internal combustion engine 2. A part of the coolant in the line 16 is led into a line circuit 19 at a position 16a of the line 16. The coolant which is led into the line circuit 19 is passed through a second EGR cooler 20 where the coolant cools the recirculating exhaust gases in the return line 5 in a second step. The coolant is then returned to the line 16 in a position 16b which is located downstream of the position 16a with respect to the intended direction of the coolant in the line 16.
    The recirculating exhaust gases are passed on in the return line 5 to a third EGR cooler 21 where they are cooled in a third stage by the coolant in a low temperature cooling system 22.
    The low temperature cooling system 22 includes a circulating coolant having a lower temperature than the coolant in the internal combustion engine cooling system 14. A coolant pump 23 circulates the coolant in the low temperature cooling system 22. The low temperature cooling system 22 includes a radiator element 24 disposed in a peripheral region B of the vehicle. driven by an electric motor 26 produces a cooling air flow through the cooling element 24 in the area B. After the cooling in the three EGR coolers 10, 20, 21 the recirculating exhaust gases are led to the mixing device 9 where they are mixed with the compressed air in the inlet line 6. Then the mixture is led of air and exhaust gases, via a branch 27, to the respective engines of the diesel engine 2.
    During operation of the diesel engine 2, exhaust gases flow out of the internal combustion engine 2 and into the exhaust line 4. During the fl most of the diesel engine 2's dri standstill, the EGR valve 7 is kept open so that some of the exhaust gases in the exhaust line 4 are led 10 15 20 25 * 30 35 into the return line 5. The exhaust gases which are led into the return line 5 generally have a temperature in the range l50 ° C - 600 ° C depending on the shale state of the internal combustion engine. The recirculating exhaust gases in the return line 5 are cooled in a first step in the EGR cooler 10 by the coolant in the high temperature cooling system 11. The coolant in the high temperature cooling system 11 emits heat in a cooler element 13 which is thus located in area A on the flow direction of the air in the area A. The coolant in the cooler element 13 is thus cooled by air with a higher temperature than the coolant in the cooler element 18. The air which passes through the cooler element 18 generally has a temperature rise of 20 ° C - 40 ° C. The coolant in the high temperature cooling system will thus not be able to be cooled to the same low temperature as the coolant in the internal combustion engine cooling system 14. However, the coolant in the high temperature cooling system 11 can be cooled to a sufficiently low temperature to provide efficient cooling of the recirculating exhaust gases. The recirculating exhaust gases may, for example, have a temperature in the temperature range 150 ° C - 200 ° C when they leave the EGR cooler 10. The recirculating exhaust gases are then led to the EGR cooler 20 where they are cooled by coolant from the internal combustion engine cooling system 14.
    The coolant here normally has a temperature in the temperature range 80 ° C-100 ° C.
    Thus, the recirculating exhaust gases can be cooled to a temperature of about 100 ° C - 120 ° C in the EGR cooler 20. The recirculating exhaust gases are finally led to the EGR cooler 21 where they are cooled in the third stage with coolant from the low temperature cooling system 22.
    The cooler element 24 of the low temperature cooling system 22 is cooled by ambient temperature air forced through the cooler element 24 by means of the separate cooler 25. 25. Thus, the coolant of the low temperature cooling system can be cooled to a temperature close to the ambient temperature. The recirculating exhaust gases can thus be cooled to a relatively low temperature in the third stage of the EGR cooler 21 before being mixed with the compressed air, which is advantageously cooled to a corresponding temperature in a charge air cooler (not shown), before the mixture is led to the internal combustion engine 2.
    During operating times when the internal combustion engine 2 is heavily loaded, it requires good cooling. The exhaust gases also have a high temperature during these operating times. However, the initial cooling of the recirculating exhaust gases by means of the high temperature cooling system 11 significantly reduces the temperature of the exhaust gases before they are cooled in the second stage of the internal combustion engine cooling system 14. Thus, the load on the internal combustion engine cooling system 14 is significantly reduced. The location of the cooler element 13 of the high-temperature cooling system 11 in the area A means that the already existing cooling air stream in the area A can also be used to cool the coolant in the high-temperature cooling system 11.
    Fig. 2 shows an alternative embodiment of the arrangement. In this case, the radiator element 13 of the high temperature cooling system 11 has been arranged in an interior area C of the vehicle. The cooler element 13 has here been fastened to the internal combustion engine 2 with suitable fastening elements. A separate fan 29k driven by an electric motor 30 is adapted to generate a cooling air stream through the cooling element 13. The air in the vicinity of the combustion engine 2 is relatively hot but it can still be used to advantage to cool the coolant in the high temperature cooling system 11. In this case the lines for the circulating coolant is made very short as the distance between the EGR cooler 10 and the cooler element 13 is short. In this case, the cooler element 24 in the low temperature cooling system 22 has been arranged in the area A in a position upstream of the cooler element 18 of the internal combustion engine cooling system 14. The coolant in the low temperature cooling system 22 will again be cooled with air of ambient temperature. In this case, the air which cools the coolant in the cooler element 18 has a slightly elevated temperature. As the coolant in the cooling system of the internal combustion engine has a nominal temperature of approximately 80 ° C, this is not directly a disadvantage. In this embodiment of the arrangement, the recirculating exhaust gases are cooled in three steps in a substantially similar manner as in the embodiment in Figs. 1.
    We therefore do not make any further review of the cooling of the recirculating exhaust gases in this case. Also in this embodiment, the presence of the high temperature cooling system 11 results in a relief of the internal combustion engine cooling system 14.
    The invention is in no way limited to the embodiment described in the drawing but can be varied freely within the scope of the claims. It is not necessary to cool the recirculating exhaust gases in three steps, but they can also be cooled in fewer steps.
    权利要求:
    Claims (9)
    [1]
    An arrangement for recirculating exhaust gases of an internal combustion engine (2) in a vehicle (1), the arrangement comprising an exhaust line (4) intended to discharge exhaust gases from the internal combustion engine (2) and a return line (5) adapted to recirculate a part of the exhaust gases in the exhaust line (4) to the internal combustion engine (2), characterized in that the arrangement comprises a high temperature cooling system (11) comprising a circulating coolant consisting of a liquid medium which at a designated operating pressure in the high temperature cooling system (11) has a boiling temperature of at least 150 ° C, an EGR cooler (10) for cooling the recirculating exhaust gases in the return line (5) in a first step by means of the circulating high-temperature coolant and a cooling element (13) where the high-temperature coolant is adapted to be cooled by air. _
    [2]
    Arrangement according to claim 1, characterized in that the cooling element (13) of the high-temperature cooling system (11) is arranged in an area (A), which is adapted to be flowed through by air, in a position downstream of a cooling element (18) of a cooling system (14). ) adapted to cool the internal combustion engine (2).
    [3]
    Arrangement according to claim 2, characterized in that the radiator element (13) of the high temperature cooling system (11) is arranged in a position between the radiator element (18) of the internal combustion engine cooling system (14) and a radiator fl (28) adapted to generate the air flow through the radiator elements ( 18, 24).
    [4]
    Arrangement according to claim 1, characterized in that the high-temperature cooling system (11) comprises a separate fan (29) arranged in connection with the radiator element (13), which is adapted to generate a cooling air flow through the radiator element (13).
    [5]
    Arrangement according to claim 4, characterized in that the radiator element (13) of the high-temperature cooling system (11) is arranged in an interior area (C) of the vehicle (1), which is located adjacent to the internal combustion engine (2).
    [6]
    Arrangement according to Claim 5, characterized in that the radiator element (13) of the high-temperature cooling system (11) is fixed to the internal combustion engine (2). 10 15 20 10
    [7]
    Arrangement according to one of the preceding claims, characterized in that the arrangement comprises at least one further EGR cooler (20, 21) for cooling the recirculating exhaust gases in the return line (5) in at least one further step before they are led to the internal combustion engine (2).
    [8]
    Arrangement according to claim 7, characterized in that the recirculating exhaust gases are adapted to be cooled in an additional EGR cooler (20) of coolant from the cooling system (14) of the internal combustion engine.
    [9]
    Arrangement according to claim 7 or 8, characterized in that the recirculating exhaust gases are adapted to be cooled in a further EGR cooler (21) of coolant from a low temperature cooling system (22) where the coolant is adapted to have a lower temperature than the coolant in the cooling system of the internal combustion engine. (14). Arrangement according to one of Claims 9, characterized in that the coolant in the low-temperature cooling system (22) is adapted to be cooled in a cooling element (24) of lu fi with. ambient temperature.
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    法律状态:
    2021-06-29| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0802349A|SE534270C2|2008-11-05|2008-11-05|Arrangement for cooling of recirculating exhaust gases of an internal combustion engine|SE0802349A| SE534270C2|2008-11-05|2008-11-05|Arrangement for cooling of recirculating exhaust gases of an internal combustion engine|
    EP09825057.4A| EP2342445B1|2008-11-05|2009-10-21|Arrangement for cooling of recirculated exhaust gases in a combustion engine|
    BRPI0916115A| BRPI0916115A2|2008-11-05|2009-10-21|'' provision for recirculated exhaust gas cooling in a combustion engine ''|
    JP2011534446A| JP5001465B2|2008-11-05|2009-10-21|Cooling device for recirculated exhaust gas in a combustion engine|
    US13/125,830| US8627807B2|2008-11-05|2009-10-21|Arrangement for cooling of recirculated exhaust gases in a combustion engine|
    PCT/SE2009/051196| WO2010053429A1|2008-11-05|2009-10-21|Arrangement for cooling of recirculated exhaust gases in a combustion engine|
    CN200980144247.8A| CN102203402B|2008-11-05|2009-10-21|Arrangement for cooling of recirculated exhaust gases in a combustion engine|
    KR1020117010503A| KR101323776B1|2008-11-05|2009-10-21|Arrangement for cooling of recirculated exhaust gases in a combustion engine|
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