Device and method for cooling a vehicle engine

Abstract

Device for cooling a vehicle engine, comprising: a combustion chamber in which a piston moves back and forth; Water jackets (16a, 16b) through which a coolant flows to cool the combustion chamber; and a cylinder block (1) which forms a frame of the vehicle engine, wherein the cylinder block (1) comprises: a cylinder block body (10) in which the combustion chamber is formed, and an exhaust gas recirculation (EGR) cooler (30) which is mounted in the cylinder block body (10) in such a way that the EGR cooler (30) exchanges heat with a coolant discharged from the combustion chamber, wherein the cylinder block body (10) is provided with an EGR cooler insertion section (20) to which a coolant from the combustion chamber is supplied and in which the EGR cooler (30) is inserted, wherein the EGR cooler (30) is provided with a gas pipe (36) in which an exhaust gas flows, wherein the exhaust gas of the gas pipe (36) is cooled by a coolant which is supplied to the EGR cooler insertion section (20), wherein a supply opening (12) is configured to supply a coolant to the EGR cooler insertion section (20) in which cylinder block body (10) is formed, wherein the cylinder block body (10) has a plurality of cylinder chambers (18), wherein the water jackets (16a, 16b) have a circulation flow channel (16b) configured to exchange heat with all cylinder chambers (18) and a direct flow channel (16a) configured to exchange heat with one of the cylinder chambers (18), wherein the feed opening (12) is formed at a point where the circulation flow channel (16b) and the direct flow channel (16a) meet, wherein the water jackets (16a, 16b) have an arc shape which encloses the outer circumferences of the cylindrical chambers (18), and wherein the EGR cooler insertion section (20) is designed such that it extends horizontally in the longitudinal direction of the cylinder block body (10).

Description

[0001] The invention relates to a device and a method for cooling a vehicle engine.

[0002] Vehicle emissions contain pollutants such as carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (HC), and the like. Of these three components produced during combustion, NOx always has an inverse causal relationship to CO and HC.

[0003] This means that most NOx is produced at a time when CO and HC are being reduced within a practical power range. NOx production increases while fuel is being fully combusted, that is, while the engine is at a higher temperature.

[0004] Therefore, emissions standards were regulated according to the relevant ordinance, leading to the development of various technologies to reduce emissions. Among these technologies is exhaust gas recirculation (EGR).

[0005] According to EGR (Exhaust Gas Recirculation), a portion of the exhaust gas (EGR gas) is added to the mixture that enters the combustion chamber, while maintaining a specific air-fuel ratio. This reduces NOx emissions without rapidly increasing other pollutants. In other words, EGR is a device used to lower the flame temperature by increasing the heat capacity of the exhaust gas.

[0006] In detail, EGR (Exhaust Gas Recirculation) recirculates a portion of the exhaust gas back into the intake system to lower the combustion temperature of a cylinder, thereby suppressing NOx production. In other words, EGR, as a means of reducing NOx in the exhaust gas, recirculates a portion of the exhaust gas to the intake system to lower the maximum combustion temperature, thus reducing NOx emissions.

[0007] Among the components of the EGR system, an EGR cooler is a type of heat exchanger that cools a high-temperature exhaust gas using engine coolant as a refrigerant. To ensure proper cooling, the EGR cooler is mounted outside the cylinder block or outside the engine itself.

[0008] JP 2015-25 420 A describes a device and a method for cooling a vehicle engine, comprising a combustion chamber in which a piston moves back and forth, water jackets in which a coolant flows to cool the combustion chamber, and a cylinder block forming a frame of the vehicle engine, wherein the cylinder block has a cylinder block body in which the combustion chamber is formed and an exhaust gas recirculation (EGR) cooler which is mounted in the cylinder block body such that the EGR cooler exchanges heat with a coolant discharged from the combustion chamber, wherein the cylinder block body is provided with an EGR cooler insert section to which a coolant from the combustion chamber is supplied and in which the EGR cooler is inserted, wherein the EGR cooler is provided with a gas pipe in which an exhaust gas flows, and wherein the exhaust gas of the gas pipe is cooled by a coolant supplied to the EGR cooler insert section. becomes.

[0009] Further devices and methods for cooling a vehicle engine are known from JP 2010-190 064 A and JP 2009-156 488 A.

[0010] The invention provides a device and a method for cooling a vehicle engine, suitable for reducing vibrations generated in a vehicle or engine, reducing working time as a result of soldering components while reducing the space (an arrangement) required for installing an exhaust gas recirculation (EGR) cooler, and increasing the cooling efficiency of a cylinder head and an EGR cooler.

[0011] This is achieved according to the invention by a device for cooling a vehicle engine according to the features of claim 1 and a method for cooling a vehicle engine according to the features of claim 8. Advantageous embodiments are described in the dependent claims.

[0012] According to one aspect of the invention, a device for cooling a vehicle engine comprises one or more combustion chambers in which a piston moves back and forth, water jackets in which a coolant flows to cool the combustion chamber, and a cylinder block that forms the frame of an engine (e.g., an internal combustion engine). The cylinder block includes a cylinder block body in which the combustion chamber is formed and an exhaust gas recirculation (EGR) cooler, which is mounted in the cylinder block body such that the EGR cooler exchanges heat with a coolant discharged from the combustion chamber.

[0013] The cylinder block is equipped with an EGR cooler inlet section, into which a coolant from the combustion chamber is supplied and in which the EGR cooler is installed. The EGR cooler is equipped with a gas pipe through which exhaust gas flows. The exhaust gas from the gas pipe is cooled by a coolant supplied to the EGR cooler inlet section.

[0014] The gas pipe can be located adjacent to the cylinder block body.

[0015] The gas pipe can contain multiple gas pipes and can have a U-shape.

[0016] The gas pipe can have an inlet channel through which an exhaust gas is introduced, a heat exchanger section that is curved from and extends from the inlet channel, and an outlet channel that is curved from and extends from the heat exchanger section, and which allows the exhaust gas introduced through the inlet channel to be discharged.

[0017] The EGR cooler may have a cooler cover that covers the EGR cooler inlet section and to which the gas pipe is mounted, and the cooler cover may be connected to the inlet and outlet ports of the gas pipe. Exhaust gas flowing in the heat exchanger section may be cooled by a coolant introduced into the EGR cooler inlet section.

[0018] The gas pipe can have a plurality of gas pipes that can be arranged one above the other parallel to a direction in which the gas pipe is inserted into the EGR cooler insertion section.

[0019] A feed opening, which supplies coolant to the EGR cooler insertion section, is formed in the cylinder block body.

[0020] The cylinder block body has multiple cylinder chambers, and the water jackets have a circulation flow channel that exchanges heat with all cylinder chambers and a direct flow channel that exchanges heat with one of the cylinder chambers. The inlet opening is located at the point where the circulation flow channel and the direct flow channel meet.

[0021] A first seal can be arranged between the gas pipe and the cooler cover on the EGR cooler, and a second seal can be arranged between the gas pipe and the EGR cooler insertion section.

[0022] According to another aspect of the invention, a method for cooling a vehicle engine comprises: introducing a coolant cooled by a radiator into a cylinder block body; introducing the coolant introduced into the cylinder block body into branched water jackets of the cylinder block body; supplying the coolant introduced into the water jackets to a combustion chamber of the cylinder block body, in which a piston moves back and forth, and to an EGR cooler insertion section formed on the outside of the cylinder block body; and exchanging heat through the coolant supplied to the EGR cooler insertion section with a gas pipe of an EGR cooler into which exhaust gas has been admitted.

[0023] When the coolant is supplied to the EGR cooler insertion section, the coolant introduced into the water jackets is diverted / branched in such a way that it moves towards a direct flow channel that is aligned with the EGR cooler insertion section and a circulation flow channel which is configured to cool a plurality of cylinder chambers of the cylinder block body.

[0024] The coolant introduced into the water jackets can be conveyed through the direct flow channel to a feed opening before it exchanges heat.

[0025] The method may further include: draining the coolant, which has exchanged heat with the EGR cooler inserted into the EGR cooler insertion section, through a discharge opening of the EGR cooler insertion section, after the coolant has been fed to the EGR cooler insertion section.

[0026] The method may further include: circulating the coolant that has flowed through the circulation flow channel and the coolant that has exchanged heat to the water jackets.

[0027] The invention is explained in more detail with reference to the drawing. The drawing shows: Fig. 1 a block diagram of the circulation of an exhaust gas from a vehicle engine and the circulation of a coolant according to an exemplary embodiment of the invention; Fig. 2 a perspective view of a vehicle engine; Fig. 3 a front view of a vehicle engine; Fig. 4 a perspective view of a cylindrical block body; Fig. 5 a perspective view of an EGR cooler insertion section of the cylinder block body made of Fig. 4th from the bottom; Fig. 6 a front view of the EGR cooler insertion section of the cylinder block body Fig. 4; Fig. 7 a perspective view of the installation of an EGR cooler in a cylinder block body; Fig. 8 a perspective view of an EGR cooler of a device for cooling a vehicle engine according to an exemplary embodiment of the invention; Fig. 9 a perspective exploded view of the EGR cooler from Fig. 8; and Fig. 10 a flowchart of a method for cooling a vehicle engine according to an exemplary embodiment of the invention.

[0028] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way.

[0029] The following description is merely exemplary and is not intended to limit the invention. It is understood that identical parts throughout the drawings are designated by the same or corresponding reference numerals.

[0030] In the drawings, the shapes and dimensions of elements may be exaggerated for clarity.

[0031] With regard to the Fig. Figures 1 to 3 describe a device for cooling a vehicle engine according to an exemplary embodiment of the invention, comprising a combustion chamber in which a piston moves back and forth, water jackets 16a and 16b in which a coolant flows to cool the combustion chamber, and a cylinder block 1 that forms the frame of an engine. The cylinder block 1 has a cylinder block body 10 and an EGR cooler insertion section 20, which is formed on the outside of the cylinder block body 10 and allows an EGR cooler 30 to be inserted therein. While a coolant is supplied to the EGR cooler insertion section 20, the cylinder block 1 can exchange heat with the EGR cooler 30.

[0032] With regard to the Fig. 4 to 6 the cylinder block 1 has a plurality of cylinder chambers 18 for the installation of the pistons and the cylinder block body 10 in which the EGR cooler insertion section 20 is formed, into which the EGR cooler 30 can be inserted.

[0033] The cylinder block body 10 has a plurality of cylinder chambers 18 arranged in a series along the longitudinal axis of the cylinder block body 10. The EGR cooler 30 can be positioned on the cylinder block 1 such that exhaust gas from a vehicle can exchange heat with the water jackets 16a and 16b. The EGR cooler 30 can be inserted into the EGR cooler insertion section 20. The EGR cooler insertion section 20 can be formed integrally along the longitudinal axis of the cylinder block body 10.

[0034] An inlet 14, which allows a coolant to be introduced through it, can be formed in the cylinder block body 10. A supply opening 12, which supplies a coolant introduced through the inlet 14 to the EGR cooler insertion section 20, can be formed in the cylinder block body 10.

[0035] Heat can be generated in the cylinder block 10 by a plurality of cylinder pistons moving vertically back and forth in the plurality of cylinder chambers 18. The cylinder block 10 can be provided with water jackets 16a and 16b to cool the plurality of cylinder chambers 18. The water jackets 16a and 16b can have a circulation flow channel 16b that exchanges heat with all cylinder chambers 18 and a direct flow channel 16a that exchanges heat with one of the cylinder chambers 18.

[0036] The feed opening 12 can be located at the point where the circulation flow channel 16b and the direct flow channel 16a meet. The feed opening 12 can be configured as a through-opening in the direction in which the EGR cooler 30 is installed, so that coolant is discharged.

[0037] A coolant can be supplied through the inlet 14 to the water jackets 16a and 16b and circulate within them. A portion of the coolant supplied to the water jackets 16a and 16b is discharged through the inlet 14 to the circulation flow channel 16b. The water jackets 16a and 16b can have an arc shape that encloses the outer circumferences of the cylinder chambers 18, which carry out heat exchange.

[0038] Here, the central angle (e.g., circular angle or central angle) of the direct flow channel 16a can be in the range of 90 degrees to 180 degrees. The circulation flow channel 16b can be formed on the outside of the cylinder chambers 18 in order to exchange heat with all cylinder chambers 18.

[0039] The EGR cooler insertion section 20 can be configured such that it extends horizontally in the longitudinal direction of the cylinder block body 10. The EGR cooler insertion section 20 has an EGR cooler insertion section body 22, which is configured such that it extends in one direction of the feed opening 12 in the cylinder block body 10.

[0040] A discharge opening 24 can be formed in the EGR cooler insertion section 20 and allows a coolant that exchanges heat with the EGR cooler 30 to be discharged through it. In one embodiment, the discharge opening 24 can be formed in one side of the EGR cooler insertion section body 22.

[0041] A receiving section 20a can be formed in the EGR cooler insertion section body 22 to accommodate the EGR cooler 30. Here, the receiving section 20a can form a coolant flow channel 20a, while the EGR cooler 30 is inserted therein.

[0042] Here, the discharge opening 24 can be configured such that coolant is discharged in a direction perpendicular to the direction in which coolant discharged from the supply opening 12 flows. The coolant discharged through the discharge opening 24 can be supplied / recirculated to the cylinder block body 10 by means of a water pump together with coolant discharged through the circulation flow channel 16b.

[0043] With regard to the Fig. 7 to 9, the EGR cooler 30 can be arranged in the cylinder block 10 such that exhaust gas flowing therein from the combustion chamber is subjected to heat exchange with a coolant introduced through the inlet 14. The EGR cooler 30 has a cooler cover 30a, which covers the EGR cooler insertion section 20, and a gas pipe 36 (e.g., gas line, including pipe and hose) which is provided on the cooler cover 30a and exchanges heat with a coolant.

[0044] The cooler cover 30a can be equipped with the gas pipe 36, which has an inlet channel 36a through which exhaust gas is supplied to the gas pipe 36, and an outlet channel 36b through which the exhaust gas is discharged. The EGR cooler 30 can exchange heat with exhaust gas flowing in the gas pipe 36 by means of a coolant supplied to the EGR cooler insertion section 20, in order to perform cooling.

[0045] The radiator cover 30a with the gas pipe 36 mounted to it can be inserted into and attached to the EGR cooler insertion section 20. A first through-opening 32, connected to the inlet channel 36a, and a second through-opening 34, connected to the outlet channel 36b, can be formed in the radiator cover 30a. The first through-opening 32 can be designed to allow the inlet channel 36a and an exhaust manifold 32a ( Fig. 3) are connected to each other, and the second through-opening 34 can be designed in such a way that it allows the outlet channel 36b to be connected to an intake manifold 34a ( Fig. 3) is connected. Accordingly, exhaust gas introduced from the exhaust manifold 32a can flow through the gas pipe 36, be cooled by a coolant and then be discharged through the exhaust channel 36b to the intake manifold 34a.

[0046] The EGR cooler 30 can be inserted into the receiving section 20a of the EGR cooler insertion section 20 and arranged at a predetermined distance from an outer wall of the cylinder block body 10 such that the coolant flow channel 20a is formed, which allows a coolant to flow in it. The EGR cooler 30 can exchange heat with the coolant flowing in the coolant flow channel 20a.

[0047] The gas pipe 36 can be provided on the radiator cover 30a to cool an exhaust gas by means of a coolant. The gas pipe 36 can cool an exhaust gas flowing within it by means of a coolant that is supplied to the EGR cooler insertion section 20. The gas pipe 36 can be arranged adjacent to the cylinder block body 10.

[0048] The gas pipe 36 has multiple gas pipes and can be U-shaped. The gas pipe 36 has an inlet channel 36a, through which exhaust gas is introduced, a heat exchanger section 36c, which is bent from and extends from the inlet channel 36a, and an outlet channel 36b, which is bent from the heat exchanger section 36c and allows the exhaust gas to be discharged. Since the inlet channel 36a is connected to the first through-opening 32, which in turn is connected to the exhaust manifold 32a, exhaust gas is introduced through it. Since the outlet channel 36b is connected to the second through-opening 34, which in turn is connected to the intake manifold 34a, the exhaust gas introduced through the inlet channel 36a is discharged through it.

[0049] The majority of the gas tubes 36 can be configured to effectively perform heat exchange. The gas tubes 36 can be arranged one above the other, parallel to the direction in which the gas tube 36 is inserted into the EGR cooler insertion section 20. A coolant can flow between / into recesses / cavities formed by stacking the gas tubes 36 and can exchange heat to increase the cooling rate.

[0050] Seals 38 can be provided at the front and rear of the gas pipe 36 to prevent coolant leakage. A first seal 38 can be arranged between the gas pipe 36 and the cooler cover 30a, and a second seal can be arranged between the gas pipe 36 and the EGR cooler insertion section 20.

[0051] Back to the Fig. 2 and Fig. 3. The exhaust manifold 32a can be connected to a catalyst device 50, and exhaust gas passing through the catalyst device 50 can be introduced into the EGR cooler 30. The catalyst device 50 can convert a gas harmful to the human body, contained in the exhaust gas produced by the vehicle engine, into a non-harmful component.

[0052] An EGR valve 40 can be installed on / in the second through-opening 34 and arranged in such a way that it can be opened and closed, so that exhaust gas can flow under the control of the EGR valve 40 only at speeds other than idle and warm-up speeds.

[0053] The following refers to the Fig. 2, Fig. 4, Fig. 7 and Fig. 10 a method for cooling a vehicle engine according to an exemplary embodiment of the invention is described.

[0054] During engine start-up, the cylinder block 10 can directly absorb combustion gases at a high temperature. Therefore, due to the high temperature, it is desirable for the cylinder block 10 to have high thermal conductivity and a high cooling effect. To prevent the cylinder block 10 from overheating, a coolant can be circulated within it. The coolant can be cooled by a heat exchanger of a radiator and then pumped to the water jackets 16a and 16b of the cylinder block 10 (S10).

[0055] Here, the coolant can be introduced through the inlet 14, which is connected to the radiator and the water jackets 16a and 16b of the cylinder block body 10. The coolant can flow to the circulation flow channel 16b of the branched water jackets 16a and 16b (S20).

[0056] Accordingly, the coolant can exchange heat with a section of a cylinder head (not shown) and then be discharged to the inlet 12. The coolant that has exchanged heat with the cylinder head through the circulation flow channel 16b can be discharged to the outside of the cylinder block body 10 and flow to the radiator's heat exchanger (S40). The coolant discharged from the heat exchanger can be returned to the water jackets 16a and 16b by means of the water pump, together with coolant that has exchanged heat with the EGR cooler 30, so that it can be circulated (S50).

[0057] According to another embodiment of the invention, the coolant removed from the heat exchanger can be guided through a heating pipe to the water pump.

[0058] Meanwhile, the coolant supplied to the water jackets 16a and 16b can flow to the direct flow channel 16a (S30). The coolant can be conveyed to the supply opening 12 more quickly via the direct flow channel 16a than via the circulation flow channel 16b. The coolant introduced through the supply opening 12 can exchange heat with the gas pipe 36 of the EGR cooler 30 (S33). The coolant that has exchanged heat with the EGR cooler 30 can be discharged through the discharge opening 24 (S36). The heat-exchanged coolant can be supplied back to the water jackets 16a and 16b by means of the water pump (not shown) together with the coolant that has passed through the circulation flow channel 16b (S36). Here, the coolant that has passed through the direct flow channel 16a can cool an exhaust gas flowing in the gas pipe 36 of the EGR cooler 30.

[0059] As described above, since the EGR cooler 30 is designed as a unit with the cylinder block body 10, the space required for installing the EGR cooler can be reduced. Likewise, since the EGR cooler 30 is inserted into the EGR cooler insertion section 20, vibrations from a vehicle or vibrations generated by a peripheral component, such as an engine or the like, can be reduced, and the labor time resulting from soldering components can be decreased. Furthermore, since the cylinder head and the EGR cooler 30 are cooled separately, cooling efficiency can be increased. Reference symbol list: 1 cylinder block 10 cylinder block bodies 12 Feed opening 14 Admission 16a, 16b Watercoats 18 cylinder chambers 20 EGR cooler insertion section 22 EGR cooler insert sections 24 Discharge opening 30 EGR coolers 30a Radiator cover 32 first passage opening 32a Exhaust manifold 34 second passageway 34a Intake manifold 36 Gas pipe 40 EGR valve 50 Catalyst device

Claims

Device for cooling a vehicle engine, comprising: a combustion chamber in which a piston moves back and forth; water jackets (16a, 16b) in which a coolant flows to cool the combustion chamber; and a cylinder block (1) forming a frame of the vehicle engine, wherein the cylinder block (1) comprises: a cylinder block body (10) in which the combustion chamber is formed, and an exhaust gas recirculation (EGR) cooler (30) which is mounted in the cylinder block body (10) such that the EGR cooler (30) exchanges heat with a coolant discharged from the combustion chamber, wherein the cylinder block body (10) is provided with an EGR cooler insertion section (20) to which a coolant from the combustion chamber is supplied and in which the EGR cooler (30) is inserted, wherein the EGR cooler (30) is provided with a gas pipe (36) in which an exhaust gas flows, wherein the exhaust gas of the gas pipe (36) is cooled by a coolant supplied to the EGR cooler insertion section (20),wherein a supply opening (12) is configured to supply a coolant to the EGR cooler insertion section (20) in which a cylinder block body (10) is formed, wherein the cylinder block body (10) has a plurality of cylinder chambers (18), wherein the water jackets (16a, 16b) have a circulation flow channel (16b) configured to exchange heat with all cylinder chambers (18) and a direct flow channel (16a) configured to exchange heat with one of the cylinder chambers (18), wherein the supply opening (12) is formed at a point where the circulation flow channel (16b) and the direct flow channel (16a) meet, wherein the water jackets (16a, 16b) have an arc shape which defines the outer circumferences of the cylinder chambers (18). encloses, and wherein the EGR cooler insertion section (20) is designed such that it extends horizontally in the longitudinal direction of the cylinder block body (10). Device according to claim 1, wherein the gas tube (36) is arranged adjacent to the cylinder block body (10). Device according to claim 1 or 2, wherein the gas pipe (36) has a plurality of gas pipes arranged one above the other parallel to a direction in which the gas pipe (36) is inserted into the EGR cooler insertion section (20). Device according to one of claims 1 to 3, wherein the gas pipe (36) has a plurality of gas pipes and is U-shaped. Device according to one of claims 1 to 4, wherein the gas pipe (36) comprises: an inlet channel (36a) through which an exhaust gas is introduced; a heat exchange section (36c) which is bent from and extends from the inlet channel (36a); and an outlet channel (36b) which is bent from and extends from the heat exchange section (36c) and which is configured to allow the exhaust gas introduced through the inlet channel (36a) to be discharged. Device according to claim 5, wherein the EGR cooler (30) has a cooler cover (30a) which covers the EGR cooler insertion section (20) and on which the gas pipe (36) is mounted, wherein the cooler cover (30a) is configured such that it is in contact with the inlet channel (36a) and the outlet channel (36b) of the gas pipe (36), and wherein an exhaust gas flowing in the heat exchanger section (36c) is cooled by a coolant supplied to the EGR cooler insertion section (20). Device according to one of claims 1 to 6, wherein a first seal (38) is arranged on / in the EGR cooler (30) between the gas pipe (36) and the cooler cover (30a), and a second seal (38) is arranged between the gas pipe (36) and the EGR cooler insertion section (20). Method for cooling a vehicle engine, comprising: introducing a coolant cooled by a radiator into a cylinder block body (10) (S10); introducing the coolant introduced into the cylinder block body (10) into branched water jackets (16a, 16b) of the cylinder block body (10) (S20); supplying the coolant introduced into the water jackets (16a, 16b) to a combustion chamber of the cylinder block body (10) in which a piston moves back and forth, and to an EGR cooler insertion section (20) formed on the outside of the cylinder block body (10) (S30, S40);and exchange of heat through the coolant led to the EGR cooler insertion section (20) with a gas pipe (36) of an EGR cooler (30) into which an exhaust gas has been admitted (S50), wherein when the coolant is supplied to the EGR cooler insertion section (20), the coolant introduced into the water jackets (16a, 16b) is diverted / branched in such a way that it moves towards a direct flow channel (16a) which is oriented towards the EGR cooler insertion section (20), and a circulation flow channel (16b) which is configured in such a way that it cools a plurality of cylinder chambers (18) of the cylinder block body (10), wherein the water jackets (16a, 16b) have an arc shape which encloses the outer circumferences of the cylinder chambers (18), and wherein the The EGR cooler insertion section (20) is designed such that it extends horizontally in the longitudinal direction of the cylinder block body (10). Method according to claim 8, wherein the coolant introduced into the water jackets (16a, 16b) is discharged through the direct flow channel (16a) to a supply opening (12) before exchanging heat. Method according to claim 9, further comprising draining the coolant which has exchanged heat with the EGR cooler (30) inserted into the EGR cooler insertion section (20) through a drain opening (24) of the EGR cooler insertion section (20) after the coolant has been / is being fed to the EGR cooler insertion section (20). Method according to one of claims 8 to 10, further comprising circulating the coolant which has flowed through the circulation flow channel (16b) and the coolant which has exchanged heat to the water jackets (16a, 16b).

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