KR20130127886A - Test apparatus for generating exhaust gas - Google Patents

Abstract

A test device for generating exhaust gas is disclosed. The test device for generating exhaust gas comprises: a combustion part which generates exhaust gas by igniting fuel and air supplied thereto; a cooler unit which cools the exhaust gas exhausted from the combustion part; a main pipeline part which guides the flow of the exhaust gas exhausted from the cooler unit; and a mounting part which is connected to the main pipeline part and allows a vehicle part to be installed thereon.

Description

Vehicle exhaust gas simulator {TEST APPARATUS FOR GENERATING EXHAUST GAS}

The present invention relates to a vehicle exhaust gas simulation apparatus, and more particularly, to a vehicle exhaust gas simulation apparatus capable of supplying exhaust gases having various temperatures and composition ratios.

In general, exhaust gas is generated while an engine of a vehicle is operated, and the exhaust gas is discharged to the outside of the vehicle through a muffler and a smoke reduction device that reduces noise.

In the case of testing the muffler and the smoke reduction device in contact with the exhaust gas, there was no separate test equipment, so the muffler and the smoke reduction device were directly installed in the vehicle.

Vehicles equipped with a muffler and a smoke reduction device are used to drive the road directly, or they are supported by a test device that supports the wheels of the vehicle to carry out a vehicle test.

Background art of the present invention is disclosed in Korean Unexamined Patent Publication No. 2008-0041700 (published on May 13, 2008, title of the invention: vehicle test apparatus and method).

Since there is no separate inspection equipment for testing vehicle components in contact with the exhaust gas, inspection time and inspection cost are increased.

In addition, when the exhaust gas is generated by installing a separate burner, the exhaust gas having various temperatures and composition ratios cannot be supplied, thereby reducing the accuracy of the inspection. Therefore, there is a need to improve this.

The present invention has been created by the necessity as described above, to provide a dedicated inspection equipment for testing the vehicle parts in contact with the exhaust gas to provide a vehicle exhaust gas mockup that can reduce the inspection time and inspection cost There is this.

In addition, the present invention can supply the exhaust gas having a variety of temperature and composition ratio, it is an object to provide a vehicle exhaust gas simulated value that can improve the accuracy of vehicle parts inspection.

The vehicle exhaust gas simulation apparatus according to the present invention includes: a combustion unit for supplying fuel and air and ignited to generate exhaust gas, a cooler unit for cooling the exhaust gas discharged from the combustion unit, and an exhaust discharged from the cooler unit It includes a main pipe portion for guiding the movement of the gas and the mounting portion in communication with the main pipe portion is installed vehicle parts.

The combustion unit further includes a case part having an inner space through which the exhaust gas moves to the cooler part, a fuel supply part supplying fuel from the outside of the case part to the inside of the case part, and an outer part of the case part from the outside of the case part to the inside of the case part surrounding the outside of the fuel supply part. It is preferable to include an air supply unit for supplying air and a guide unit connected to the air supply unit for guiding the movement of the exhaust gas.

In addition, the air supply unit preferably includes an outer conduit which forms a passage through which air flows along the outer periphery of the fuel supply part, and a supply conduit connected to the outer conduit at the outer side of the case part and spaced apart along the outer conduit.

In addition, the guide portion, one side is preferably formed in a cylindrical shape that is open toward the cooler portion and the other side toward the cooler.

The combustion unit may include a first supply pipe through which the case part passes and supplies the dilution gas mixed with air and fuel to the outside of the guide part, and a second supply pipe and guide part which penetrate the guide part and supply dilution gas into the guide part. It is preferable to include a side conduit which forms a passage through which the dilution gas moves between the case portions.

In addition, the cooler unit, it is preferable to include a cooling conduit which is installed in a wound state to guide the movement of the cooling water.

In addition, the main pipe portion preferably includes a first main pipe connecting the cooler and the mounting portion, and a second main pipe for guiding the movement of the exhaust gas passing through the mounting portion.

In another aspect, the present invention preferably further includes a bypass pipe passage portion connecting the first main pipe and the second main pipe to guide movement of the exhaust gas bypassing the mounting portion.

In addition, the main pipe line portion includes a first switching valve installed in the first main pipe to control the flow of exhaust gas, the bypass pipe portion is a second for controlling the movement of the exhaust gas flowing into the bypass pipe portion from the first main pipe It is preferable to include a switching valve.

In addition, the present invention preferably further comprises a recirculation unit connecting the second main tube and the combustion unit and returning the exhaust gas moving along the second main tube to the combustion unit.

In addition, the recirculation unit preferably includes a recirculation pipe connecting the second main pipe and the combustion unit and a suction valve to form a pressure for sucking the exhaust gas flowing through the second main pipe.

In addition, the recirculation unit preferably includes a recirculation cooling member installed in the recirculation conduit to cool the exhaust gas moving along the recirculation conduit.

In addition, the recirculation unit preferably includes a recirculation heater member which is installed in the recirculation conduit and heats exhaust gas moving along the recirculation conduit.

In addition, the combustion unit, it is preferable to include a rapid expansion combustor (Dump combustor).

Since the vehicle exhaust gas mock-up apparatus according to the present invention can supply the same exhaust gas as the set exhaust gas by changing the temperature and composition ratio of the exhaust gas, it is possible to improve the accuracy of vehicle component inspection.

In addition, the present invention, by providing a dedicated inspection equipment for testing a vehicle component can reduce the inspection time and inspection cost.

In addition, the present invention employs a rapidly expanding combustor, which is excellent in flame stability against fluctuations in pressure downstream and equivalent ratio in upstream, and combustion can be strongly designed even in a small combustion region, so that the apparatus can be compactly designed.

In addition, the present invention, by providing a cooler unit can be independent of changes in the exhaust gas temperature and composition, thereby enabling the configuration of a device that can grasp the various characteristics of the after-treatment device and the parts in contact with the high temperature under various conditions.

1 is a configuration diagram schematically showing a vehicle exhaust gas master head according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a combustion unit according to an embodiment of the present invention.
3 is a side view of a combustion unit according to an embodiment of the present invention.
4 is an exploded perspective view of a combustion unit according to an embodiment of the present invention.
5 is a block diagram of a vehicle exhaust gas simulation apparatus according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a vehicle exhaust gas simulation apparatus according to the present invention. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a configuration diagram schematically showing a vehicle exhaust gas scavenger according to an embodiment of the present invention, Figure 2 is a cross-sectional view schematically showing a combustion unit according to an embodiment of the present invention, Figure 3 is a present invention 4 is a side view of a combustion unit according to an embodiment of the present disclosure, FIG. 4 is an exploded perspective view of the combustion unit according to an embodiment of the present invention, and FIG. 5 is a block diagram of a vehicle exhaust gas simulation apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the vehicle exhaust gas simulation apparatus 1 according to an embodiment of the present invention includes a combustion unit 20 for supplying fuel and air and igniting to generate exhaust gas, and a combustion unit. The vehicle is in communication with the cooler unit 40 for cooling the exhaust gas discharged from the 20, and the main pipeline 50 and the main pipeline 50 for guiding the movement of the exhaust gas discharged from the cooler 40. And a mounting portion 60 on which the component 10 is installed. The vehicle component 10 may be detachably installed in the mounting unit 60, and various kinds of vehicle components may be installed in the mounting unit 60.

As shown in Figures 1 to 4, the combustion unit 20 for generating the exhaust gas, the supply of fuel and air is made, various kinds of burners can be used in the technical concept of ignited to generate the exhaust gas. . In the present embodiment, a case where the combustion unit 20 is a quick combustor (Dump combustor) will be described as an example. The rapid expansion combustor according to the present embodiment is excellent in flame stability against fluctuations in pressure downstream and equivalent ratio in the upstream, and can be compactly designed because combustion occurs strongly even in a small combustion region. Combustion unit 20 according to the present embodiment can ensure the stability of the flame in the large flow rate conditions of the exhaust gas. Although not specifically illustrated in the drawings, the combustion unit 20 according to the present embodiment has positioned holes upstream of the swirler and the end of the nozzle so that diffusion and premixed combustion may be simultaneously performed for stable flame generation. In consideration of the arrangement of five diameter 1mm holes in each position in a circular shape, and the combustor is arranged in double, the flame can be stably maintained even in the experiment of large flow rate.

The combustion unit 20 according to an embodiment includes a case unit 22 having an inner space 23 through which exhaust gas moves to the cooler unit 40, and a case unit 22 from the outside of the case unit 22. A fuel supply unit 24 for supplying fuel to the inside of the air), an air supply unit 26 for enclosing the outside of the fuel supply unit 24 and supplying air from the outside of the case unit 22 to the inside of the case unit 22; It is connected to the air supply 26 includes a guide unit 30 for guiding the movement of the exhaust gas.

In the combustion unit 20, fuel and air are respectively supplied through the fuel supply unit 24 and the air supply unit 26 to form a flame.

An inner space 23 through which exhaust gas is moved is provided inside the case part 22 forming the outer shape of the combustion unit 20.

The fuel supply unit 24 which communicates the inside and the outside of the case part 22 may be formed in various shapes within a technical concept of supplying fuel to the inside of the case part 22.

The fuel supply part 24 according to an embodiment passes through the side surface of the case part 22 and is installed in a pipe shape.

The air supply unit 26 for supplying air along the outer side of the fuel supply unit 24 supplies air in the circumferential direction along the outer side of the fuel supply unit 24 when the fuel is discharged through the fuel supply unit 24. It can be formed in various shapes within the technical spirit.

The air supply unit 26 according to an embodiment may be connected to the outer conduit 27 and the outer conduit 27 from the outside of the case part 22 and the outer conduit 27, which forms a passage through which air flows along the outer periphery of the fuel supply unit 24. And a supply pipe 28 spaced apart from each other along the circumference of the outer pipe 27.

Since the outer conduit 27 is provided outside the fuel supply section 24 provided in a pipe shape, air is moved between the fuel supply section 24 and the outer conduit 27.

Since the support member 29 is installed between the fuel supply unit 24 and the outer conduit 27, the outer conduit 27 is supported by the support member 29 so that air is moved into the outer conduit 27. Can be secured.

An outer conduit 27 connecting the inner side and the outer side of the case part 22 surrounds the fuel supply part 24 and is provided in a pipe shape.

The supply pipe 28 is connected to the outer conduit 27 extending to the outside of the case portion 22, the air is supplied to the inner side of the outer conduit 27 through the supply conduit 28.

The supply pipe 28 is provided in plurality along the circumference of the outer pipe 27. The supply pipe 28 according to the embodiment is spaced apart at intervals set along the outer circumferential surface of the outer pipe 27. Therefore, the air flowing between the fuel supply unit 24 and the outer conduit 27 can maintain a uniform flow.

The guide unit 30 is connected to the air supply unit 26 to guide the movement of the flame and the exhaust gas.

Guide portion 30 according to an embodiment, one side is connected to the air supply 26 and the other side is formed in a cylindrical shape that is open toward the cooler portion (40).

The guide part 30 connected to the outer side path 27 of the air supply part 26 is formed in diameter larger than the diameter of the outer side path 27.

The combustion unit 20 may be ignited by supply of fuel through the fuel supply unit 24 and supply of air through the air supply unit 26 to form exhaust gas, and a separate dilution gas is added to the combustion unit 20. Can be supplied to change combustion conditions.

Dilution gas according to an embodiment is mixed with nitrogen and air at a set ratio. This dilution gas is supplied to the inner space 23 through the case portion 22.

The combustion unit 20 includes a first supply pipe 32 passing through the case part 22 to supply the dilution gas to the inner space 23.

The first supply pipe 32 is spaced apart from the outer pipe 27 and penetrates one side of the case part 22 (the right side of FIG. 2).

The diluent gas mixed with air and fuel is supplied to the outside of the guide part 30 through the first supply pipe 32.

In order to supply the dilution gas into the guide part 30, a second supply pipe 34 penetrating one side of the guide part 30 is provided.

A part of the dilution gas supplied to the outside of the guide part 30 is moved to the inside of the guide part 30 through the second supply pipe 34, and the rest of the dilution gas is guide part 30 and the case part 22. ) Is moved through the side pipe 36 provided between.

The side channel 36 according to the exemplary embodiment is a space formed by separating the outside of the guide part 30 and the inside of the case part 22, and the diluting gas moves along the side pipe 36. Cool down 30).

In addition, the dilution gas moving through the side pipe 36 meets the flame exiting the guide unit 30 to further activate the flame.

The side pipe 36 may be formed in various shapes within the technical idea of forming a passage through which the dilution gas moves.

As shown in FIG. 1 and FIG. 5, the cooler part 40 connected to the case part 22 of the combustion part 20 may be used in various forms within the technical concept of cooling the exhaust gas discharged from the combustion part 20. A chiller can be used. The cooler unit 40 according to the present exemplary embodiment may independently change the exhaust gas temperature and the composition, and thus may configure a device capable of identifying various characteristics of the post-treatment device and parts in contact with high temperature under various conditions. .

The cooler unit 40 according to an embodiment includes a cooling conduit 42 that guides the movement of the coolant and is installed in a wound state.

In addition, since the temperature of the exhaust gas can be changed without changing the composition ratio of the exhaust gas, and the composition ratio can be changed without changing the temperature of the exhaust gas, it is possible to generate exhaust gas under various conditions. .

The main pipe line part 50 which guides the movement of the exhaust gas discharged from the cooler part 40 passes through the first main pipe 52 and the mounting part 60 connecting the cooler part 40 and the mounting part 60. And a second main pipe 56 for guiding the movement of the exhaust gas.

The first main pipe 52 and the second main pipe 56 are located at both sides of the mounting part 60, and the first main pipe 52 connecting the cooler part 40 and the mounting part 60 is first switched. A valve 54 is installed to control the flow of exhaust gas.

The mounting part 60 which communicates with the main pipe part 50 and in which the vehicle component 10 is installed is provided with a mounting flange 62 connected to the first main pipe 52 and the second main pipe 56.

The vehicle component 10 is fixed to the mounting flange 62 and exposed to the exhaust gas passing through the mounting portion 60.

The bypass pipe part 70 is installed on one side of the main pipe part 50. The bypass pipe part 70 connects the first main pipe 52 and the second main pipe 56 and guides the movement of the exhaust gas bypassing the mounting part 60. Can be used.

The bypass pipe part 70 according to an embodiment has one side connected to the first main pipe 52 positioned between the first switching valve 54 and the cooler part 40 and the second main pipe 56. It includes a bypass pipe 72 connected to the other side and a second switching valve 74 for controlling the movement of the exhaust gas flowing into the bypass pipe portion 70 from the first main pipe (52).

The second switching valve 74 is installed in the bypass pipe 72 and is operated under the control of the controller 100.

The first switching valve 54 installed in the first main pipe 52 to control the flow of the exhaust gas is also operated under the control of the controller 100 to guide the movement of the exhaust gas.

The first switch valve 54 and the second switch valve 74 are operated by the control signal of the controller 100. Accordingly, the first switching valve 54 and the second switching valve 74 may be modified in various ways such as allowing the flow of exhaust gas by only opening one of them, including the case in which both of the first switching valve 54 and the second switching valve 74 are open.

In order to vary the composition ratio and temperature of the exhaust gas through the combustion unit 20, a recirculation unit 80 connecting the second main pipe 56 and the combustion unit 20 is installed. The recirculation unit 80 according to the present exemplary embodiment may recycle the exhaust gas discharged to the outside in order to adjust the temperature of the exhaust gas and the concentration of oxygen. The recirculation unit 80 lowers the temperature of the high temperature exhaust gas using the recirculation cooling member 86, adjusts the oxygen concentration by using an apparatus for adjusting the amount of the exhaust gas recycled, and controls the recirculation heater member 88. The temperature can be adjusted additionally. In addition, the vehicle exhaust gas simulation apparatus 1 according to the present embodiment may be modified in various ways, such as by using the nitrogen generator 92 when the use condition is low.

The recirculation unit 80 may supply various exhaust gases discharged through the second main pipe 56 to the combustion unit 20 and change various structures within the technical concept of varying the exhaust gases to a predetermined temperature.

The recirculation unit 80 according to an embodiment is installed in the recirculation pipe line 82 and the recirculation pipe line 82 connecting the second main pipe 56 and the combustion unit 20 to the second main pipe 56. A suction valve 84 which forms a pressure to suck the flowing exhaust gas.

One side of the recirculation pipe 82 is connected to the second main pipe 56, and the other side of the recirculation pipe 82 is connected to the case part 22 of the combustion unit 20.

The suction valve 84 installed in the recirculation pipe line 82 is operated by a control signal of the control unit 100, and the intake pressure at which the exhaust gas is moved in the direction from the second main pipe 56 toward the recirculation pipe line 82. Form.

A recirculation cooling member 86 is installed in the recirculation pipe 82 of the recirculation unit 80, and cools the exhaust gas moving along the recirculation pipe 82 to a predetermined temperature.

A recirculation heater member 88 for heating the exhaust gas moving along the recirculation pipe line 82 to a set temperature is also provided in the recirculation pipe line 82.

On the other hand, the dilution gas supply unit 90 for supplying the dilution gas into the combustion unit 20 is provided outside the combustion unit 20.

The dilution gas supply unit 90 according to an embodiment includes a nitrogen generator 92 for generating nitrogen and an air supplier 96 for supplying air.

Nitrogen generated in the nitrogen generator 92 and air supplied through the air supplier 96 are supplied to the first supply pipe 32 installed in the combustion unit 20 through the connection pipe 99.

The first valve 94 is installed in the connecting pipe 99 connected to the nitrogen generator 92, and the second valve 98 is installed in the connecting pipe 99 connected to the air supply 96.

The first valve 94 and the second valve 98 are operated under the control of the controller 100, and can adjust the ratio of nitrogen and air constituting the diluent gas.

On the other hand, the injector 110 is installed in the first main pipe 52, the igniter 115 is generated inside the case portion 22 to generate a spark by generating a spark. The injector 110 of this embodiment may be used in various modifications, such as may be used for post-processing evaluation.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating state of the vehicle exhaust gas simulation apparatus 1 according to an embodiment of the present invention.

Fuel of the combustion unit 20 is supplied through the fuel supply unit 24, and air is supplied through the supply line 28.

The fuel supplied to one side of the fuel supply unit 24 (right side in FIG. 1) from the outside of the case unit 22 is discharged to the other side of the fuel supply unit 24 provided inside the case unit 22.

The air supplied through the supply line 28 is moved through the inside of the outer line 27, and then discharged along the outer circumferential direction of the fuel supply unit 24.

That is, since the air is discharged in a shape surrounding the outside of the fuel discharged through the fuel supply unit 24, it is easy to mix the fuel and air.

The igniter 115 is operated to generate a flame inside the guide part 30, and the generation of the flame generates exhaust gas.

On the other hand, the control unit 100 adjusts the opening and closing degree of the first valve 94 and the second valve 98, and adjusts the composition ratio of the dilution gas moving along the connecting pipe (99).

The dilution gas moves to the inside of the case part 22 through the first supply passage 32 formed in the case part 22.

A part of the dilution gas is introduced into the guide part 30 through the second supply pipe 34 formed in the guide part 30, and then mixed with fuel and air supplied into the case part 22 to flame. To form.

The second supply pipe 34 is installed in the circumferential direction along the outer circumference of the outer pipe 27 connected to the guide part 30. Therefore, since the flame formed by the dilution gas injected from the second supply pipe 34 is formed in a spiral shape rotating in one direction, the combustion efficiency is improved.

When it is necessary to change the composition ratio of the exhaust gas, the control unit 100 controls the operations of the first valve 94 and the second valve 98 of the dilution gas supply unit 90.

In addition, the temperature of the exhaust gas discharged from the combustion unit 20 is adjusted by the cooler unit 40 operated under the control of the control unit 100.

That is, when the temperature of the exhaust gas supplied to the vehicle component 10 installed in the mounting unit 60 is lower than the temperature of the exhaust gas discharged from the combustion unit 20, and there is no change in the composition ratio of the exhaust gas, the control unit 100 The cooler unit 40 is operated to cool the exhaust gas to a predetermined temperature.

On the other hand, according to the test environment of the vehicle component 10, the operation of the first switching valve 54 and the second switching valve 74 is controlled by the control unit 100, so that the main pipeline 50 and the bypass pipeline Exhaust gas movement is possible through various paths through the unit 70.

If further control of the temperature or composition ratio of the exhaust gas discharged from the combustion unit 20 is necessary, the control unit 100 operates the intake valve 84 to recycle the exhaust gas moving through the second main pipe 56. Inhale by blast furnace.

Since the exhaust gas moving through the recirculation pipe 82 is adjusted to a temperature set by the operation of the recirculating cooling member 86 and the recirculating heater member 88 and then supplied to the combustion unit 20 again, the temperature and composition ratio of the exhaust gas. Can be changed in various ways.

According to the above-described configuration, the vehicle exhaust gas simulation apparatus 1 according to the embodiment can supply the same exhaust gas as the exhaust gas set by changing the temperature and composition ratio of the exhaust gas, thereby inspecting the vehicle component 10. Can improve the accuracy.

In addition, by providing a dedicated inspection equipment for testing the vehicle component 10 can reduce the inspection time and inspection cost.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

In addition, the vehicle exhaust gas simulation apparatus used for the inspection of automobile parts has been described as an example, but this is merely exemplary, and the vehicle exhaust gas simulation apparatus according to the present invention may also be used for inspection of other mechanical devices.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

1: Vehicle Exhaust Simulator
10: vehicle part 20: combustion part
22: case portion 23: inner space
24: fuel supply unit 26: air supply unit
27: outer conduit 28: supply conduit
29: support member 30: guide portion
32: first supply line 34: second supply line
36: side pipe 40: cooler
42: cooling pipe line 50: main pipe line
52: first main pipe 54: first switching valve
56: second main tube 60: mounting portion
62: mounting flange 70: bypass pipe section
72: bypass line 74: second switching valve
80: recirculation unit 82: recirculation line
84: suction valve 86: recirculating cooling member
88: recirculation heater member 90: dilution gas supply unit
92: nitrogen generator 94: first valve
96: air supply 98: second valve
99: connector 100: control unit
110: injector 115: igniter

Claims (14)

A combustion unit for supplying fuel and air and igniting to generate exhaust gas;
A cooler unit for cooling the exhaust gas discharged from the combustion unit;
A main pipe part for guiding the movement of the exhaust gas discharged from the cooler part; And
And a mounting part in communication with the main pipe part and installed with a vehicle component.
The method of claim 1,
The combustion unit may include a case unit having an inner space through which exhaust gas moves to the cooler unit;
A fuel supply unit configured to supply fuel from the outside of the case unit to the inside of the case unit;
An air supply unit surrounding the outside of the fuel supply unit and supplying air from the outside of the case unit to the inside of the case unit; And
And a guide unit connected to the air supply unit and guiding the movement of the exhaust gas.
3. The method of claim 2,
The air supply unit, the outer tube to form a passage through which air flows along the outer periphery of the fuel supply unit; And
Vehicle supply gas simulation apparatus comprising a supply pipe connected to the outer pipe in the outer side of the case portion, and spaced apart along the circumference of the outer pipe.
3. The method of claim 2,
The guide part, the vehicle exhaust gas simulation apparatus, characterized in that the one side is connected to the air supply and the other side is formed in a cylindrical shape opening toward the cooler.
3. The method of claim 2,
The combustion unit comprises: a first supply pipe passing through the case part to supply a dilution gas mixed with air and fuel to the outside of the guide part;
A second supply pipe passing through the guide part and supplying a diluting gas to the inside of the guide part; And
And a side conduit for forming a passage through which the diluting gas moves between the guide part and the case part.
The method of claim 1,
The cooler unit, the vehicle exhaust gas simulation apparatus characterized in that it comprises a cooling conduit which is installed in a wound state to guide the movement of the cooling water.
The method of claim 1,
The main pipe part, the first main pipe connecting the cooler and the mounting portion; And
And a second main pipe for guiding the movement of the exhaust gas passing through the mounting portion.
The method of claim 7, wherein
And a bypass pipe path portion connecting the first main pipe and the second main pipe to guide movement of the exhaust gas bypassing the mounting portion.
The method of claim 8,
The main pipe passage portion is provided in the first main pipe includes a first switching valve for controlling the flow of exhaust gas,
The bypass pipe line unit, the vehicle exhaust gas simulation apparatus characterized in that it comprises a second switching valve for controlling the movement of the exhaust gas flowing into the bypass pipe section from the first main pipe.
The method of claim 7, wherein
And a recirculation unit connecting the second main tube and the combustion unit to return the exhaust gas moving along the second main tube to the combustion unit.
11. The method of claim 10,
The recirculation unit, the recirculation pipe passage connecting the second main pipe and the combustion unit; And
And a suction valve installed in the recirculation pipe passage, the suction valve forming a pressure for sucking the exhaust gas flowing through the second main pipe.
The method of claim 11,
The recirculation unit, the vehicle exhaust gas simulation apparatus, characterized in that it comprises a recirculation cooling member installed in the recirculation pipe to cool the exhaust gas moving along the recirculation pipe.
The method of claim 11,
The recirculation unit, the vehicle exhaust gas simulation apparatus characterized in that it comprises a recirculation heater member which is installed in the recirculation pipe to heat the exhaust gas moving along the recirculation pipe.
14. The method according to any one of claims 1 to 13,
The combustion unit vehicle exhaust gas simulation apparatus characterized in that it comprises a rapid expansion combustor (Dump combustor).

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