JP2010038019A - Exhaust gas purifier for internal combustion engine - Google Patents

Abstract

An exhaust gas purifying apparatus for an internal combustion engine capable of making the amount collected by a suit filter uniform on the downstream side of each oxidation catalyst as long as at least one of the plurality of oxidation catalysts functions normally. To provide.
An exhaust gas purification device 10 of an internal combustion engine 1 includes first and second exhaust aftertreatment devices 11 and 12 provided so that exhaust gas from the internal combustion engine 1 flows in parallel. The first and second exhaust aftertreatment devices 11 and 12 oxidize the dosing fuel and generate heat, and are disposed downstream of the oxidation catalyst 21 to collect particulate matter (PM) in the exhaust gas. A suit filter 22 and a communication chamber 23 formed between the oxidation catalyst 21 and the suit filter are configured, and the communication chambers of the first and second exhaust aftertreatment devices 11 and 12 are connected to each other via a communication pipe 24. Communicated.
[Selection] Figure 2

Description

  The present invention relates to an exhaust gas purification device for an internal combustion engine.

  Conventionally, by providing an exhaust gas purification device in the middle of the exhaust pipe of the engine, particulate matter (PM) in the exhaust gas that is the source of black smoke is collected, and the PM It is done to prevent it from being released into the atmosphere. As this exhaust gas purification device, one using a plurality of suit filters is known (Patent Document 1). In such an aftertreatment device, when collecting PM, each suit filter is connected to the exhaust pipe so as to have a parallel relationship so that the exhaust gas flows evenly into each suit filter. It has become.

  On the other hand, when regenerating the suit filter, each suit filter is connected to the exhaust pipe so as to be in a serial relationship, and the back pressure is intentionally increased by each suit filter to raise the exhaust gas temperature. The PM collected by each suit filter is burned to be regenerated. That is, in the exhaust gas purifying apparatus described in the cited document 1, when a plurality of switching valves are provided in the middle of the exhaust pipe and PM is collected, the exhaust gas flows in parallel to each suit filter. When the switching valve is switched and regeneration is performed, the switching is performed so that the exhaust gas flows in series into each suit filter.

  By the way, in the exhaust gas purification device, the oxidation catalyst for oxidizing and heating the dosing fuel (for example, light oil) and the suit filter for collecting PM downstream thereof are each covered with a cylindrical case. One having an exhaust aftertreatment device is known. In such an exhaust gas purification device, dosing is performed when the suit filter is regenerated. By performing dosing, the temperature of the exhaust gas is raised, and the PM collected by the suit filter is burned and regenerated by the exhaust gas that has become hot.

  Here, when considering an exhaust gas purification device equipped with such an exhaust aftertreatment device, it is considered to simply use a plurality of exhaust aftertreatment devices in order to obtain a purification capacity suitable for a large displacement engine. It is done. For example, according to Patent Document 1, the exhaust pipe is branched into a plurality of systems, and an exhaust aftertreatment device is arranged in parallel in each branch pipe. In such a configuration, a processing capacity corresponding to a large displacement can be obtained, and it is not necessary to prepare a large size oxidation catalyst and a suit filter as one exhaust aftertreatment device, and an exhaust aftertreatment device of an existing size is provided. It is possible to respond reliably by using a plurality of. For this reason, as a whole exhaust gas purification device, development costs can be reduced, and the exhaust gas purification device can be efficiently arranged even in a narrow installation space.

JP 2001-289032 A

  However, in an exhaust gas purification device having a plurality of (for example, a pair) exhaust aftertreatment devices in parallel with each other, dosing fuel is excessively supplied to one oxidation catalyst, or the exhaust gas temperature is activated by the oxidation catalyst. If dosing fuel is supplied to one oxidation catalyst even though the temperature has not been sufficiently reached, one oxidation catalyst will stick to the film in a state where the dosing fuel is mixed with PM, and clogging will occur. As a result, exhaust gas will not flow. As a result, of the two exhaust aftertreatment devices, the exhaust gas flows only into the exhaust aftertreatment device that is not clogged with the oxidation catalyst, and the amount of PM collected by each suit filter is reduced. There is a problem that the maintenance frequency of each suit filter is different, such as a large difference, and the maintenance becomes complicated.

An object of the present invention is to provide an exhaust gas purification device for an internal combustion engine that can make the flow rate of exhaust gas passing through each suit filter uniform if at least one of the plurality of catalyst bodies functions normally. There is to do.
Another object of the present invention is to provide an exhaust gas purification device for an internal combustion engine that can make the flow rate of exhaust gas passing through each catalyst body uniform as long as at least one of the plurality of suit filters functions normally. Is to provide.

An exhaust gas purification device for an internal combustion engine according to the present invention includes a plurality of exhaust aftertreatment devices provided in the exhaust gas purification device for an internal combustion engine so that exhaust gas from the internal combustion engine flows in parallel. The exhaust aftertreatment device includes a catalyst body through which exhaust gas passes, a suit filter that is arranged upstream or downstream of the catalyst body and collects particulate matter in the exhaust gas, the catalyst body, and the suit A communication chamber formed between the filters, and the communication chambers of each exhaust aftertreatment device communicate with each other via a communication pipe.
Here, as the catalyst body, an oxidation catalyst that oxidizes and exotherms the dosing fuel, or a DeNOx catalyst such as a NOx reduction catalyst, a NOx storage reduction catalyst, or a urea denitration catalyst can be applied.

  In the present invention, it is desirable that the catalyst bodies used in the plurality of exhaust aftertreatment devices have the same shape or the like, and the suit filters also desirably have the same shape or the like.

  In the present invention, it is preferable that the catalyst body is an oxidation catalyst that oxidizes dosing fuel and generates heat, and the suit filter is disposed downstream of the oxidation catalyst.

  In the present invention, the internal combustion engine is connected to an exhaust pipe having first and second branch pipes for diverting the flow of exhaust gas, and the plurality of exhaust after-treatment devices include first exhaust pipes, The first and second exhaust aftertreatment devices respectively attached to the second branch pipes, and the first and second branch pipes of the exhaust pipe are respectively used as oxidation catalysts for the first and second exhaust aftertreatment devices. Desirably, first and second fuel supply devices for supplying dosing fuel are provided.

  In the above, according to the exhaust gas purifying apparatus of the present invention, a plurality of exhaust aftertreatment devices are used. However, since the communication chambers of the exhaust aftertreatment devices are communicated with each other through a communication pipe, one exhaust aftertreatment device is used. As long as the exhaust gas passes through the catalyst body, the exhaust gas that has passed through the catalyst body, even if the catalyst body of another exhaust aftertreatment device falls into a situation in which the passage of the exhaust gas is obstructed for some reason, It can be made to flow into the other exhaust aftertreatment devices via the communication pipe, can be exhausted through the suit filters of each exhaust aftertreatment device, and the flow rate flowing into each suit filter can be balanced to the same extent Thus, the collection amount can be made uniform. Such an effect can be obtained in the same manner even when the suit filter is arranged on the upstream side of the catalyst body. Thereby, the object can be achieved.

  On the other hand, according to the present invention, as long as the exhaust gas passes through the suit filter of one exhaust aftertreatment device, the suit filter of the other exhaust aftertreatment device falls into a situation where the passage of the exhaust gas is obstructed for some reason. Even if the exhaust gas is about to flow into the suit filter, the exhaust gas can flow into the other exhaust aftertreatment device via the communication pipe, and the exhaust gas aftertreatment device can pass through the catalyst body. The flow rate flowing into the catalyst body can be balanced to the same extent. Such an effect can be obtained in the same manner even when the suit filter is arranged on the upstream side of the catalyst body. This achieves another object of the present invention.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing the entire exhaust gas purification device 10 of the present embodiment. FIG. 2 is a schematic diagram showing a state in which one oxidation catalyst 21 used in the exhaust gas purification apparatus 10 is clogged.

  In FIG. 1, an exhaust gas purification device 10 is a device that collects PM in exhaust gas discharged from the internal combustion engine 1, and an exhaust pipe that discharges exhaust gas (see black arrows and hatched arrows in the figure). 2 is attached.

  Here, the internal combustion engine 1 is, for example, a diesel engine or a gasoline engine with a large displacement mounted on a construction machine, and an exhaust turbine that supercharges intake air (see white arrows in the figure) with exhaust energy of the exhaust gas. A supercharger 3 is provided. The exhaust turbine supercharger 3 includes an exhaust turbine 5 connected to an exhaust manifold 4 and a compressor 7 connected to an intake manifold 6, and an exhaust pipe 2 is connected to an exhaust gas outlet side of the exhaust turbine 5. Yes. The exhaust pipe 2 branches into a first branch pipe 8 and a second branch pipe 9 on the downstream side.

  The internal combustion engine 1 includes a radiator that exchanges heat between cooling water and cooling air, a cooling fan that supplies cooling air to the radiator, a fuel supply device that supplies fuel for combustion in the cylinder, A controller for controlling the fuel supply device is provided, but the illustration thereof is omitted in FIG.

  Further, the exhaust turbine supercharger 3 is not an essential component of the present invention, and may be provided as necessary. Further, in the case where a supercharger is provided, such supercharging is not limited to the exhaust turbine supercharger 3, but is provided with a compressor driven by an electric motor, or driven by the output of the internal combustion engine 1. It may be provided with a compressor.

  Specifically, the exhaust gas purification device 10 includes first and second exhaust aftertreatment devices 11 and 11 connected so that exhaust gas flows in parallel to the downstream sides of the first and second branch pipes 8 and 9, respectively. 12 and first and second fuel supply devices 13 and 14 provided in the middle of the first and second branch pipes 8 and 9, respectively.

  Each of the first and second exhaust aftertreatment devices 11 and 12 includes a cylindrical case 20 communicating with the first and second branch pipes 8 and 9, and an oxidation as a catalyst body is provided upstream in the case 20. A catalyst 21 is accommodated, and a suit filter 22 is accommodated on the downstream side.

  The oxidation catalyst 21 is a catalyst for oxidizing and heating the dosing fuel supplied by the first and second fuel supply devices 13 and 14. By oxidizing and heating the dosing fuel, the temperature of the exhaust gas is raised, and by using this raised exhaust gas, the PM deposited on the suit filter 22 is self-burned and removed by incineration, and the suit filter 22 is regenerated. Let

  Although the detailed illustration is omitted, the suit filter 22 has a structure in which a large number of small holes are arranged. The small holes communicate from the inflow side to the outflow side, and the cross section is formed in a polygonal shape (for example, a hexagonal shape). As the small holes, the ones opened on the inflow side and sealed on the outflow side and the ones sealed on the inflow side and opened on the outflow side were alternately arranged and flowed from the former small hole Exhaust gas passes through the boundary wall, escapes into the latter small hole, and flows downstream. And PM is collected by the boundary wall.

  The material of the suit filter 22 is made of ceramics such as cordierite or silicon carbide, or metal such as stainless steel or aluminum, and is appropriately determined according to the application. Note that an oxidation catalyst different in material from the oxidation catalyst 21 may be coated on the inflow side of the suit filter 22 with a wash coat or the like.

  Each of the first and second fuel supply devices 13 and 14 includes a nozzle for spraying dosing fuel in the first and second branch pipes 8 and 9, a flow control valve for controlling the flow rate of the dosing fuel, and the like. ing. The spray in the first and second fuel supply devices 13 and 14 and the spray amount are controlled by the above-described controller based on the temperature and pressure of exhaust gas detected by sensors (not shown).

  In the first and second exhaust aftertreatment devices 11 and 12 of this embodiment, the oxidation catalyst 21 and the suit filter 22 are separated from each other, and the space formed by the separation is the communication chamber 23. ing. In addition, the communication chambers 23 of the first and second exhaust aftertreatment devices 11 and 12 communicate with each other through a communication pipe 24. Although the communication pipe 24 is illustrated as a straight pipe in FIG. 1, it may have an arbitrary shape depending on the actual installation position of the first and second exhaust aftertreatment devices 11 and 12.

According to the exhaust gas purification device 10 described above, the exhaust gas discharged from the internal combustion engine 1 flows into the exhaust pipe 2 after passing through the exhaust turbine supercharger 3, and is discharged by the first and second branch pipes 8 and 9. Divided. The exhaust gas flowing into the first branch pipe 8 flows into the first exhaust aftertreatment device 11, passes through the oxidation catalyst 21 and the suit filter 22 in the first exhaust aftertreatment device 11, and is discharged to the outside. . At this time, PM in the exhaust gas is collected in the suit filter 22.
Similarly, the exhaust gas flowing into the second branch pipe 9 flows into the second exhaust aftertreatment device 12, passes through the oxidation catalyst 21 and the suit filter 22 in the second exhaust aftertreatment device 12, and goes to the outside. Discharged. Therefore, the PM in the exhaust gas is also collected by the suit filter 22.

In addition, each suit filter 22 normally accumulates a similar amount of PM with the passage of time, and when it is determined that the amount of PM collected has reached its limit, exhaust gas is exhausted. On the condition that the temperature is equal to or higher than the activation temperature in the oxidation catalyst 21, dosing fuel is sprayed from the first and second fuel supply devices 13 and 14, and the oxidation catalyst 21 oxidizes and generates heat to exhaust gas. Is raised above the regeneration temperature of the suit filter 22. Then, the PM accumulated on the suit filter 22 is burned by the exhaust gas raised to the regeneration temperature or higher, and the suit filter 22 is regenerated.
In such a normal state, almost no exhaust gas flows in the communication pipe 24 that connects the communication chambers 23 of the first and second exhaust aftertreatment devices 11 and 12.

On the other hand, for example, a failure occurs in the first fuel supply device 13, and an excessive amount of dosing fuel is supplied to the oxidation catalyst 21 in the first exhaust aftertreatment device 11, or is made liquid rather than mist-like. When the dosing fuel is supplied in a state where the exhaust gas temperature does not reach the activation temperature in the oxidation catalyst 21 or the dosing fuel is supplied, as shown in FIG. It will stick and eventually penetrate into the interior. This film-like substance S is a substance in which liquid fuel and PM are mixed, and clogging occurs in the oxidation catalyst 21 to inhibit the passage of exhaust gas.
When such a situation occurs, the supply of dosing fuel from the first fuel supply device 13 is stopped.

  In the situation shown in FIG. 2, the exhaust gas discharged from the internal combustion engine 1 flows into the exhaust pipe 2 after passing through the exhaust turbine supercharger 3, but the oxidation catalyst on the first exhaust aftertreatment device 1 side. 21 is not branched to the first branch pipe 8 due to clogging, but flows only to the second branch pipe 9. The exhaust gas that has flowed into the second branch pipe 9 flows into the second exhaust aftertreatment device 12, passes through the oxidation catalyst 21 in the second exhaust aftertreatment device 12, and then part of the exhaust gas remains as it is. It passes through the suit filter 22 and is discharged to the outside, and the remainder flows from the communication chamber 23 through the communication pipe 24 into the communication chamber 23 on the first exhaust post-treatment device 11 side, and the suit filter 22 of the first exhaust post-treatment device 11. Is discharged to the outside.

That is, in the exhaust gas purification apparatus 10 according to the present embodiment, even if one of the oxidation catalysts 21 is clogged, the exhaust gas passes through the communication pipe 24 so that the flow rate of the exhaust gas passing through each suit filter 22 is reduced. The balance can be made substantially the same, and the degree of PM accumulation can be equalized in each suit filter 22. Therefore, maintenance of each suit filter 22 can be performed at the same time, and the maintenance is not complicated.
On the contrary, although not shown, even if one suit filter 22 is clogged, the flow rate of the exhaust gas passing through each oxidation catalyst 21 can be balanced, and an appropriate amount of exhaust gas can be supplied to each oxidation catalyst 21. By making it flow in, the oxidation catalyst 21 can function reliably.

  Even if one of the oxidation catalysts 21 is clogged, the exhaust gas always flows into both the first and second exhaust aftertreatment devices 11 and 12, and therefore the temperature and pressure of the exhaust gas are detected. It is sufficient that the sensors to be provided are provided on either one of the first and second exhaust post-treatment devices 11 and 12, and it is not necessary to provide them on both sides, so that the part cost can be reduced.

  Furthermore, in order to purify the exhaust gas from the internal combustion engine 1, a capacity corresponding to both of the suit filters 22 is required. In this embodiment, a pair of capacities for satisfying the required purification capacity are used. Since the oxidation catalyst 21 and the pair of suit filters 22 are used, one oxidation catalyst 21 and one suit filter 22 are of a general size used in an exhaust gas purification device such as a truck. A pair of these may be prepared. Therefore, there is no need to specially develop and use a large oxidation catalyst or a suit filter corresponding to a large displacement engine of a construction machine, and the parts cost can be greatly reduced.

[Second Embodiment]
FIG. 3 shows an exhaust gas purification apparatus 1 according to the second embodiment of the present invention. In FIG. 3, the same members as those in the first embodiment are denoted by the same reference numerals.
In the first and second exhaust aftertreatment devices 11 and 12 in the present embodiment, a suit filter 22 is disposed on the upstream side, and a urea denitration catalyst 25 as a catalyst body with a communication chamber 23 sandwiched downstream thereof. Is arranged. Further, first and second reducing agent supply devices 15 and 16 for supplying urea as a reducing agent are provided at positions corresponding to the communication chambers 23 of the respective cases 20.

  The urea denitration catalyst 25 is made of a base metal such as zeolite or vanadium, reacts ammonia obtained from a reducing agent (urea) and NOx in the exhaust gas, and decomposes and purifies NOx into nitrogen and oxygen.

  By the way, in this embodiment using the urea denitration catalyst 25 as a catalyst body, a hydrolysis catalyst 26 is disposed upstream of the urea denitration catalyst 25 and an oxidation catalyst 27 is disposed downstream. The hydrolysis catalyst 26 has a function of decomposing the supplied reducing agent to generate ammonia, and the generated ammonia is used for reaction in the downstream urea denitration catalyst 25. Further, the oxidation catalyst 27 here is different in nature from the oxidation catalyst 21 and the oxidation catalyst coated on the suit filter 22 in the first embodiment, and the upstream urea denitration catalyst 25 becomes redundant. Ammonia is oxidized and decomposed into nitrogen and water to make them harmless.

  Even in this embodiment, even if one suit filter 22 is clogged or the passage of the exhaust gas on the one catalyst 25 to 27 side is obstructed, the flow rate of the exhaust gas flowing into the other Can be balanced, and the same effect as in the first embodiment can be obtained. However, FIG. 3 illustrates a case where the exhaust gas cannot pass through the catalysts 25 to 27 on the first exhaust aftertreatment device 11 side.

  The exhaust gas purification apparatus of the present invention may be attached to a frame, a bonnet, or the like forming the engine room, for example, in the engine room in which the internal combustion engine is accommodated, or attached to the upper side or the like of the internal combustion engine itself. The mounting position and the like may be determined as appropriate in the implementation.

The best configuration, method, and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of quantity and other detailed configurations.
Therefore, the description limited to the shape, quantity and the like disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  For example, in the first embodiment, when one oxidation catalyst 21 is clogged, the exhaust gas that has passed through the other oxidation catalyst 21 becomes the suit filter of each of the first and second exhaust aftertreatment devices 11 and 12. However, it is possible to provide a rectifying plate or the like for equalizing the flow rate at this time or to set the inner diameter or the like of the communication pipe 24 for the purpose of equalizing the flow rate. include. A similar configuration can also be applied to the second embodiment.

  In each of the above-described embodiments, the exhaust gas purification device 10 including the first and second exhaust aftertreatment devices 11 and 12 has been described. However, as the exhaust gas purification device of the present invention, the communication chambers communicate with each other through a communication pipe. Therefore, the number is not limited to two, and may be three or more. In such a case, a pipe branched into three or more can be used.

In each of the above embodiments, the internal combustion engine 1 is provided with one exhaust manifold 4, and one exhaust pipe 2 is connected to the exhaust manifold 4, and the exhaust pipe 2 is connected to the first and second branch pipes 8, 8. The structure in which the first and second exhaust aftertreatment devices 11 and 12 are respectively attached to the first and second branch flow paths 8 and 9 has been described. For example, a V-type engine or a horizontally opposed engine Thus, when the exhaust gas purification device of the present invention is applied to an internal combustion engine having two exhaust manifolds, the first exhaust aftertreatment device is attached to one exhaust manifold via an exhaust pipe, and the other exhaust A second exhaust aftertreatment device may be attached to the manifold via another exhaust pipe, and the communication chambers of these first and second exhaust aftertreatment devices may be communicated with each other by a communication pipe.
Further, even in an in-line engine having a plurality of cylinders, when a plurality of exhaust manifolds divided from each other are used, an exhaust aftertreatment device may be provided corresponding to each exhaust manifold.

  In the first and second exhaust aftertreatment devices 11 and 12 of the first embodiment, the oxidation catalyst 21 and the suit filter 22 are accommodated in one case 20, but they are accommodated in separate cases. In such a case, the space in the piping connecting the cases is a communication chamber, and the piping in each exhaust aftertreatment device may be communicated with the communication tube according to the present invention. Moreover, also in 2nd Embodiment, the suit filter 22 and each catalyst 25-27 can be accommodated in a separate case.

In the first embodiment, the first and second fuel supply devices 13 and 14 are provided in the first and second branch pipes 8 and 9, respectively. However, only one fuel is provided in the portion of the exhaust pipe 2 before branching. Even when a supply device is provided, it is included in the present invention.
Further, as the fuel supply device, a fuel supply device for fuel used for combustion in the engine cylinder may be used, or dosing fuel may be supplied to the oxidation catalyst by so-called post injection or the like.

In the first embodiment, the oxidation catalyst 21 that oxidizes and exotherms the dosing fuel is used as the catalyst body of the present invention. In the second embodiment, the urea denitration catalyst 25 is used. The medium may be a DeNOx catalyst other than the urea denitration catalyst 25, such as a NOx reduction catalyst or a NOx storage reduction catalyst. The NOx reduction catalyst, NOx occlusion reduction catalyst, and the like may be arranged either upstream or downstream of the suit filter with the communication chamber interposed therebetween.
Further, the present invention includes a case where an oxidation catalyst that oxidizes and exotherms the dosing fuel and a DeNOx catalyst are used in combination.

  INDUSTRIAL APPLICABILITY The present invention can be used for an exhaust gas purifying device for an internal combustion engine mounted on a civil engineering machine, an agricultural machine, a power generation device, a transportation vehicle, etc. (road vehicle and railway vehicle) in addition to various construction machines used for construction work. .

The schematic diagram which shows the whole exhaust-gas purification apparatus which concerns on 1st Embodiment of this invention. The schematic diagram which shows the state with which one oxidation catalyst used for the said exhaust gas purification apparatus was clogged. The schematic diagram which shows the whole exhaust gas purification apparatus which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Exhaust pipe, 8 ... 1st branch pipe, 9 ... 2nd branch pipe, 10 ... Exhaust gas purification apparatus, 11 ... 1st exhaust post-treatment apparatus, 12 ... 2nd exhaust post-treatment apparatus, 13 DESCRIPTION OF SYMBOLS ... 1st fuel supply apparatus, 14 ... 2nd fuel supply apparatus, 21 ... Oxidation catalyst, 22 ... Suit filter, 23 ... Communication room, 24 ... Communication pipe.

Claims (3)

In an exhaust gas purification device for an internal combustion engine,
A plurality of exhaust aftertreatment devices provided so that exhaust gas from the internal combustion engine flows in parallel;
These exhaust aftertreatment devices
A catalyst body through which exhaust gas passes;
A suit filter arranged on the upstream side or downstream side of the catalyst body to collect particulate matter in the exhaust gas;
An exhaust of an internal combustion engine comprising: a communication chamber formed between the catalyst body and the suit filter, wherein the communication chambers of each exhaust aftertreatment device communicate with each other through a communication pipe. Gas purification device. The exhaust gas purification apparatus for an internal combustion engine according to claim 1,
The catalyst body is an oxidation catalyst that oxidizes dosing fuel and generates heat,
The exhaust filter for an internal combustion engine, wherein the suit filter is disposed downstream of the oxidation catalyst. The exhaust gas purification device for an internal combustion engine according to claim 2,
The internal combustion engine is connected to an exhaust pipe having first and second branch pipes for diverting the flow of exhaust gas,
The plurality of exhaust aftertreatment devices are first and second exhaust aftertreatment devices attached to the first and second branch pipes of the exhaust pipe, respectively.
The first and second branch pipes of the exhaust pipe are provided with first and second fuel supply devices for supplying dosing fuel to the oxidation catalysts of the first and second exhaust aftertreatment devices, respectively. An exhaust gas purification device for an internal combustion engine.

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