JP2010038020A - Exhaust emission control device of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine, uniformly dispersing a reducing agent in exhaust gas. <P>SOLUTION: The exhaust emission control device of the internal combustion engine has a reducing agent supply valve 7 arranged in an exhaust passage 5 upstream of a catalyst 6 and controls emissions of exhaust in the catalyst 6 with the reducing agent injected from the reducing agent supply valve 7, wherein a deflecting member 12 is arranged downstream of the reducing agent supply valve 7 and in the exhaust passage 5 upstream of the catalyst 6. The deflecting member 12 can deflect an exhaust gas flow 11 between a direction of a wall surface on which the reducing agent supply valve 7 is arranged and a direction of the opposite wall surface by controlling its inclination angle with respect to an axis direction of the exhaust passage 5 and the inclination angle of the deflecting member 12 is controlled so that a deflection direction of the exhaust gas flow 11 containing the injected reducing agent is varied from the direction of the wall surface on which the reducing agent supply valve 7 is arranged to the direction of the opposite wall surface according to increase of a flow rate of the exhaust gas flow 11 in the exhaust passage 5 when the reducing agent is injected from the reducing agent supply valve 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust emission control device for an internal combustion engine.

  When the air-fuel ratio of the inflowing exhaust gas is lean, the NOx storage catalyst that stores NOx contained in the exhaust gas and releases the stored NOx when the air-fuel ratio of the inflowing exhaust gas becomes the stoichiometric air-fuel ratio or rich is disposed in the engine exhaust passage. The reducing agent supply valve is arranged upstream of the NOx storage catalyst, and when the NOx should be released from the NOx storage catalyst, the reducing agent is supplied from the reducing agent supply valve, and the air-fuel ratio of the exhaust gas flowing into the NOx storage catalyst Internal combustion engines that enrich the engine are known.

  In this internal combustion engine, in order to release NOx well from the NOx storage catalyst, it is necessary to disperse the reducing agent injected from the reducing agent supply valve in the exhaust gas as much as possible and to flow into the NOx storage catalyst. For this purpose, a breathable plate-like member comprising a collection of a plurality of exhaust flow passages arranged in parallel extending in the axial direction of the exhaust pipe is disposed in the exhaust pipe downstream of the reducing agent supply valve, and the breathable plate-like member is formed from the reducing agent supply valve. An internal combustion engine that injects a reducing agent that is injected toward the upstream end face of a member is known (see, for example, Patent Document 1). In this internal combustion engine, the reducing agent is dispersed and introduced into each exhaust flow passage of the breathable plate-like member, thereby dispersing the reducing agent in the exhaust gas.

JP-A-2005-214100

  However, in practice, the reducing agent is not uniformly dispersed and injected from the reducing agent supply valve onto the upstream end face of the air-permeable plate-like member, and the reducing agent is not uniformly dispersed and flows into each exhaust flow passage. That is, the injection pressure from the reducing agent supply valve is substantially constant, but the flow rate or flow rate of the exhaust gas flowing through the exhaust pipe varies depending on the operating state of the internal combustion engine, so that the injection was performed as shown in FIGS. 13 and 14, for example. The reducing agent 20 is biased. 13 and 14 are longitudinal sectional views of the exhaust pipe 5 in the vicinity of the reducing agent supply valve 7. FIG. 13 shows a case where the exhaust gas is at a low flow rate, that is, when the engine speed is low, and the reducing agent 20 injected from the reducing agent supply valve 7 is in the direction of the wall opposite to the wall on which the reducing agent supply valve 7 is disposed. Biased toward On the other hand, FIG. 14 shows a case where the exhaust gas is at a high flow rate, that is, when the engine speed is high, and the reducing agent 20 injected from the reducing agent supply valve 7 is directed toward the wall surface on the side where the reducing agent supply valve 7 is disposed. Biased toward

  Therefore, a different amount of reducing agent is discharged from each exhaust flow passage, and the different amount of reducing agent flowing out from each exhaust flow passage is not sufficiently mixed downstream of the air-permeable plate member, so that the reducing agent is put into the exhaust gas. There is a problem that it cannot be uniformly dispersed.

  In addition, there is another problem in terms of uniformly dispersing the reducing agent in the exhaust gas using the air-permeable plate-like member when viewed from a more microscopic viewpoint. That is, in order to promote the dispersion of the reducing agent, the reducing agent is temporarily attached to and held on the partition wall separating the exhaust flow passages of the breathable plate member, and the reducing agent is sufficiently vaporized while being held. Is preferred. However, as shown in the enlarged view of the partition wall surface in FIG. 15, there is a problem that the injected reducing agent droplets 18 are not adhered and held, that is, repelled on the surface without being sufficiently vaporized and not sufficiently vaporized. is there.

  Due to these problems, the dispersibility of the reducing agent is deteriorated, and when the non-uniform reducing agent flows into the downstream catalyst, partial deterioration occurs, resulting in a decrease in the exhaust purification rate.

  Accordingly, an object of the present invention is to provide an exhaust purification device for an internal combustion engine in which a reducing agent is uniformly dispersed in exhaust gas.

  In order to solve the above problem, according to the first aspect of the present invention, a reducing agent supply valve is disposed in the exhaust passage upstream of the catalyst, and exhaust gas is purified in the catalyst by the reducing agent injected from the reducing agent supply valve. In an exhaust gas purification apparatus for an internal combustion engine, a deflection member is disposed in a catalyst upstream exhaust passage downstream of a reducing agent supply valve, and the deflection member controls an exhaust gas flow by controlling an inclination angle of the exhaust passage with respect to an axial direction. The flow rate of the exhaust gas flow in the exhaust passage during the injection of the reducing agent from the reducing agent supply valve can be deflected between the wall direction in which the reducing agent supply valve is disposed and the opposite wall direction. Accordingly, the internal combustion engine controls the inclination angle of the deflecting member so as to change the deflection direction of the exhaust gas flow containing the injected reducing agent from the wall surface direction where the reducing agent supply valve is disposed to the opposite wall surface direction. Excretion Purifier is provided. That is, in the first aspect of the present invention, the reducing agent is exhausted by controlling the deflection member according to the flow rate of the exhaust gas to control the deflection of the reducing agent injected from the reducing agent supply valve caused by the flow rate of the exhaust gas. It becomes possible to disperse uniformly in the gas.

  According to the invention described in claim 2, in the invention described in claim 1, the position where the resistance to the exhaust gas flow received by the deflecting member is minimized except when the reducing agent is injected from the reducing agent supply valve. Further, an exhaust gas purification apparatus for an internal combustion engine that controls the inclination angle of the deflection member is provided. In other words, in the invention described in claim 2, it is possible to suppress the pressure loss in the exhaust passage due to the deflecting member when the reducing agent is not injected from the reducing agent supply valve.

  According to a third aspect of the present invention, there is provided an exhaust gas purification apparatus for an internal combustion engine according to the first or second aspect of the present invention, wherein at least two deflecting members are arranged in parallel to the exhaust gas flow. Is done. That is, in the invention described in claim 3, by using a plurality of deflecting members, it is possible to eliminate the unevenness of the reducing agent and to disperse the reducing agent more uniformly.

  Further, according to the invention described in claim 4, in the invention described in claim 4, the flow of exhaust gas containing the reducing agent is largely deflected toward the deflecting member disposed near the wall surface opposite to the deflecting direction. An exhaust gas purification apparatus for an internal combustion engine that controls the tilt angle is provided. That is, in the invention described in claim 4, the reducing agent can be more uniformly dispersed by changing the degree of deflection of the exhaust gas deflected by each deflecting member depending on the location.

  According to the invention described in claim 5, the exhaust gas purification of the internal combustion engine in which the reducing agent supply valve is disposed in the exhaust passage upstream of the catalyst, and the exhaust gas is purified in the catalyst by the reducing agent injected from the reducing agent supply valve. In the device, a mesh member having a breathable mesh surface is disposed in the exhaust passage downstream of the reducing agent supply valve and upstream of the catalyst, and the mesh surface temporarily holds the reducing agent injected from the reducing agent supply valve. When the reducing agent is injected from the reducing agent supply valve, the mesh surface adheres to or retains the reducing agent when the reducing agent is injected. Provided is an internal combustion engine exhaust gas purification apparatus that controls an angle at which resistance to an exhaust gas flow received by a mesh surface is minimized except during injection of a reducing agent from a reducing agent supply valve. That is, in the invention described in claim 5, the reducing agent can be uniformly dispersed with a simple structure by using the mesh member, and the mesh can be used at a time other than when the reducing agent is injected from the reducing agent supply valve. It becomes possible to suppress the pressure loss in the exhaust passage by the member.

  According to the sixth aspect of the present invention, in the exhaust gas purification apparatus for an internal combustion engine that purifies exhaust gas in the catalyst with the reducing agent injected from the reducing agent supply valve, the exhaust gas passage downstream of the reducing agent supply valve and upstream of the catalyst A reducing agent holding member having an adhesion holding portion that temporarily holds and vaporizes the reducing agent is disposed therein, and the photocatalytic material having a photocatalytic action is provided in the adhesion holding portion and light is irradiated to the photocatalytic material in the exhaust passage. There is provided an exhaust gas purification apparatus for an internal combustion engine that includes a light source that oxidizes and removes deposits adhering to an adhesion holding portion by photocatalysis. That is, in the invention according to the sixth aspect, the reducing agent can be uniformly dispersed in the exhaust gas by temporarily adsorbing and vaporizing the reducing agent in the adhesion holding portion, and easily generated in the adhesion holding portion. The deposit can be easily oxidized and removed by photocatalysis.

  According to the invention described in each claim, there is a common effect that the reducing agent can be uniformly dispersed in the exhaust gas.

  Hereinafter, an exhaust emission control device for an internal combustion engine according to the present invention will be described with reference to the drawings. FIG. 1 is an overall view of an internal combustion engine equipped with an exhaust emission control device of the present invention. In the embodiment shown in FIG. 1, the exhaust purification device of the present invention is used for a compression ignition type internal combustion engine, but it can also be used for other internal combustion engines such as a spark ignition type internal combustion engine.

  FIG. 1 shows an overall view of a compression ignition type internal combustion engine. Referring to FIG. 1, 1 is an engine body, 2 is an intake manifold, and 3 is an exhaust manifold. The outlet of the exhaust manifold 3 is connected to the inlet of the oxidation catalyst 4, and the outlet of the oxidation catalyst 4 is connected to the inlet of the catalyst 6 through the exhaust pipe 5. A reducing agent supply valve 7 is disposed in the exhaust pipe 5 upstream of the catalyst 6. The reducing agent supply valve 7 is connected to an electrically controlled supply variable discharge pump 9 via a reducing agent supply pipe 8, and the supply pump 9 is connected to a reducing agent tank 10 containing, for example, a liquid reducing agent. . In the exhaust pipe 5 downstream of the reducing agent supply valve 7 shown in A and in the upstream of the catalyst 6, a reducing agent disperser for dispersing the reducing agent, which will be described later according to some embodiments, is arranged.

  The type of the reducing agent can be determined according to the type of the catalyst 6 and the exhaust gas component to be purified. For example, hydrocarbon such as light oil (fuel), urea, ammonia or the like can be used as the reducing agent. In the embodiment described below, a case where urea water is used as the reducing agent and a NOx selective reduction catalyst is used as the catalyst 6 will be described.

The NOx selective reduction catalyst 6 is made of, for example, ammonia adsorption type Fe zeolite. When the urea water is to be supplied, the urea water stored in the reducing agent tank 10 is injected by the supply pump 9 into the exhaust gas flowing through the exhaust pipe 5 from the reducing agent supply valve 7, and at this time, the ammonia generated from the urea NOx contained in the exhaust gas is reduced in the NOx selective reduction catalyst 6 by ((NH ₂ ) 2 CO + H ₂ O → 2 NH ₃ + CO ₂ ). The oxidation catalyst 4 carries a noble metal catalyst such as platinum, for example, and this oxidation catalyst 4 functions to oxidize HC contained in the exhaust gas.

  The electronic control unit (ECU) 30 is a digital computer and includes a ROM (Read Only Memory) 32, a RAM (Random Access Memory) 33, a CPU (Microprocessor) 34, an input port 35, and the like connected to each other by a bidirectional bus 31. An output port 36 is provided. A load sensor 40 that generates an output voltage proportional to the depression amount L of the accelerator pedal 39 is connected to the accelerator pedal 39, and the output voltage of the load sensor 40 is input to the input port 35 via the corresponding AD converter 37. . Further, the input port 35 is connected to a crank angle sensor 41 that generates an output pulse every time the crankshaft rotates, for example, 15 °. The CPU 34 calculates the engine speed N based on the output pulse from the crank angle sensor 41. On the other hand, the output port 36 is connected to the reducing agent supply valve 7 and the supply pump 9 via a corresponding drive circuit 38.

  FIG. 2 is an enlarged cross-sectional view of part A of FIG. 1 in which the reducing agent disperser according to the first embodiment of the present invention is arranged. The reducing agent disperser according to the present embodiment has one or at least two deflecting plates 12. The deflection plate 12 has a rotating shaft 12a disposed perpendicular to the injection axis of the reducing agent supply valve 7 and parallel to the cross section of the exhaust pipe 5, and the exhaust pipe 5 with the rotating shaft 12a as the center. The position can be controlled by an actuator (not shown) by an inclination angle with respect to the direction of the central axis 5a. The arrangement of the deflection plate 12 shown in FIG. 2 is a steady position with an inclination angle of 0 degrees, and the deflection plate 12 is arranged at this steady position except when the reducing agent is injected, and the resistance to the exhaust gas flow 11 is minimized. Yes. FIG. 3 shows a cross section taken along line BB in FIG.

  FIG. 4 is an enlarged cross-sectional view of part A of FIG. 1 showing the arrangement of the deflection plate 12 when the reducing agent is injected when the exhaust gas is at a low flow rate. When the flow rate of the exhaust gas is low, as described above with reference to FIG. 13, the injected reducing agent 20 tends to be biased toward the wall surface opposite to the wall surface on which the reducing agent supply valve 7 is disposed. Therefore, as shown in FIG. 4, the inclination angle of the deflection plate 12 is controlled so that the exhaust gas flow 11 containing the reducing agent is directed toward the wall surface on the side where the reducing agent supply valve 7 is disposed. Accordingly, the reducing agent is not biased, and the reducing agent can be uniformly dispersed in the exhaust gas. Note that the position at which the inclination angle of the deflection plate 12 is not zero and the exhaust gas flow 11 is deflected is referred to as a deflection position.

  By controlling the deflection plate 12 closer to the wall surface opposite to the wall surface on which the reducing agent supply valve 7 having a large bias of the reducing agent is disposed, the displacement amount of the inclination angle of the deflection plate 12 is controlled to be larger. The dispersibility of the reducing agent can be further improved. Further, since the bias of the reducing agent increases as the flow rate decreases, it can be controlled to increase the displacement amount of the inclination angle of the deflector plate 12 as the flow rate decreases.

  FIG. 5 is an enlarged cross-sectional view of part A of FIG. 1 showing the arrangement of the deflection plate 12 when the reducing agent is injected when the exhaust gas is at a high flow rate. When the flow rate of the exhaust gas is high, as described above with reference to FIG. 14, the injected reducing agent 20 tends to be biased toward the wall surface on the side where the reducing agent supply valve 7 is disposed. Therefore, as shown in FIG. 5, the inclination angle of the deflection plate 12 is controlled so that the exhaust gas flow 11 containing the reducing agent is directed toward the wall surface on the side opposite to the side where the reducing agent supply valve 7 is disposed. Accordingly, the reducing agent is not biased, and the reducing agent can be uniformly dispersed in the exhaust gas.

  The deflection of the reducing agent is controlled by controlling the deflection plate 12 closer to the wall on the side where the reducing agent supply valve 7 having a large bias of the reducing agent is disposed so that the displacement amount of the inclination angle of the deflection plate 12 is increased. The sex can be further improved. Further, since the bias of the reducing agent increases as the flow rate increases, the amount of displacement of the tilt angle of the deflecting plate 12 can be controlled to increase as the flow rate increases.

  In the present embodiment, the deflecting plate 12 is disposed in the same cross section of the exhaust pipe 5, but may be disposed in different cross sections. Further, the shape of the deflecting plate 12 can be arbitrarily set within a range in which the flow of the exhaust gas can be deflected.

  FIG. 6 shows an example of the control mechanism of the deflection plate 12. 6A is a schematic view of the control mechanism viewed from the axial direction of the exhaust pipe 5, and FIG. 6B is a schematic side view thereof. Each deflection plate 12 is connected to a drive shaft 14 that reciprocates by an actuator 13, and an inclination angle can be controlled around a rotation axis 12 a of the deflection plate 12. According to this control mechanism, each deflection plate 12 can be integrally controlled, the structure is simplified, and the cost can be reduced. In addition, each deflection plate 12 may be controlled using an actuator that is independently controlled.

  7 and 8 are enlarged cross-sectional views of part A where the reducing agent disperser according to the second embodiment of the present invention is arranged. The reducing agent disperser according to the present embodiment has one mesh member 15, and the mesh member 15 controls the rotation angle, that is, the inclination angle similarly to the first embodiment, by an actuator (not shown) around the rotation shaft 15 a. It is possible. As shown in FIG. 9, the mesh member 15 has a mesh structure composed of a plurality of minute through holes 16, and therefore has a large surface area with which the reducing agent contacts.

  When the exhaust gas flow 11 containing the reducing agent passes through the through-hole 16, the reducing agent droplets hit the mesh portion and break up, thereby promoting atomization. Further, since the through hole 16 is very small, a liquid film that closes the through hole 16 by the surface tension of the reducing agent droplets is formed and temporarily attached and held. It is possible to vaporize sufficiently during the holding. Thereby, the reducing agent can be uniformly dispersed in the exhaust gas. In addition, when the mesh member 15 is comprised with a metal member, since it has higher heat conductivity and can improve evaporation property, it is preferable. Moreover, when a plurality of mesh members are stacked, the reducing agent is more easily held.

  FIG. 7 shows the arrangement of the mesh member 15 other than during the injection of the reducing agent, and the inclination angle as shown in the figure is zero so as to minimize the resistance to the exhaust gas flow 11 except during the injection of the reducing agent. Is controlled to be arranged. FIG. 8 shows the arrangement of the mesh member 15 when the reducing agent is injected. At the time of the injection of the reducing agent, in order to pass more injected reducing agent through the mesh member 15 and keep it attached, the arrangement shown in the figure is such that the injection axis of the reducing agent supply valve 7 and the plane of the mesh member 15 are perpendicular to each other. Controlled. Regarding the arrangement at the time of injection of the reducing agent, the inclination angle may be controlled so that the injected reducing agent is most adhered and held in accordance with the flow rate of the exhaust gas.

  FIG. 10 is an enlarged cross-sectional view of a part A where the reducing agent disperser according to the third embodiment of the present invention is arranged. The reducing agent disperser according to the present embodiment has a breathable plate-like member 17, and the breathable plate-like member 17 is a honeycomb composed of an aggregate of a plurality of exhaust flow passages 17b arranged in parallel and subdivided by partition walls 17a. It is formed from a structure.

  FIG. 11 is an enlarged view of the surface of the partition wall 17a. The present embodiment is characterized in that a coating material 19 is applied to the partition wall 17a so as to increase the affinity with the reducing agent. Due to the effect of the coating material 19, the injected reducing agent droplets 18 are adhered and held as a liquid film 18 a, and the reducing agent can be sufficiently vaporized 20 and can be uniformly dispersed in the exhaust gas. It becomes. This eliminates the problem described above with reference to FIG.

  In this embodiment, since urea water is used as the reducing agent, a highly hydrophilic substance such as titanium oxide is selected as the coating material. Further, by coating with a hydrophilic substance, even if a deposit mainly made of solid carbon adheres to the surface of the partition wall 17a, it can be washed by the reducing agent liquid film 18a to maintain the surface properties. Therefore, an increase in pressure loss due to deposit is prevented, and the dispersibility of the reducing agent is improved.

  FIG. 12 is an enlarged cross-sectional view of part A where the reducing agent disperser according to the fourth embodiment of the present invention is arranged. The reducing agent disperser according to the present embodiment has the same breathable plate-like member 17 as that of the third embodiment shown in FIG. 10, and further the ultraviolet light 21 so as to irradiate the surface of the partition wall 17a of the breathable plate-like member 17. Is disposed in the exhaust pipe 5. In the present embodiment, a material having an affinity for a reducing agent and having a photocatalytic action when irradiated with ultraviolet rays is selected as the coating material 19. Therefore, in the present embodiment, titanium oxide is used as the coating material 19.

  By irradiating the coating material 19 having a photocatalytic action with ultraviolet rays, deposits mainly composed of solid carbon deposited on the surface of the partition wall 17a can be oxidized and removed to maintain the surface properties. Furthermore, the surface is cleaned by the reducing agent liquid film 18a together with the oxidation removal, and the surface property can be maintained. Further, since the deposit also reacts with NOx in the exhaust gas in the oxidation reaction, it can be used for NOx reduction purification. Thereby, exhaust properties can be improved.

  The ultraviolet irradiation is performed at predetermined intervals or intervals, for example, after a predetermined operation time has elapsed since the previous irradiation or after a predetermined amount of reducing agent has been injected from the previous irradiation.

  In addition, as another embodiment for increasing the affinity with the reducing agent on the surface of the partition wall 17a and forming a liquid film of the reducing agent, a method of roughening the surface roughness, or applying a metal mesh to the surface of the partition wall 17a Alternatively, there is a method of forming the partition wall 17a itself with a metal mesh.

  The third, fourth, and other embodiments can be used in combination with the first and second embodiments. That is, the coating material 19 having a high affinity with the reducing agent may be applied to the surface of the deflection plate 12 in the first embodiment or the mesh member 15 in the second embodiment. Furthermore, a substance having a photocatalytic action may be used as the coating material 19 and the ultraviolet light 21 may be disposed in the exhaust pipe 5.

It is a figure of the whole internal combustion engine by which the exhaust gas purification apparatus of this invention is mounted. It is an expanded sectional view of the A section of Drawing 1 where the reducing agent disperser by a 1st embodiment by the present invention is arranged. 3 is a cross section taken along line BB in FIG. 2. It is an expanded sectional view of the A section of Drawing 1 where the reducing agent disperser by a 1st embodiment by the present invention when exhaust gas is injected at the time of low flow of exhaust gas is arranged. It is an expanded sectional view of the A section of Drawing 1 where the reducing agent disperser by a 1st embodiment by the present invention when exhaust gas is injected when exhaust gas is a high flow rate is arranged. It is a figure which shows an example of the control mechanism of the deflection | deviation plate. It is an expanded sectional view of the A section by which the reducing agent disperser by 2nd embodiment by this invention is arrange | positioned. It is an expanded sectional view of the A section by which the reducing agent disperser by 2nd embodiment by this invention is arrange | positioned. It is a figure which shows a mesh structure. It is an expanded sectional view of the A section by which the reducing agent disperser by 3rd Embodiment by this invention is arrange | positioned. It is an enlarged view of the partition surface. It is an expanded sectional view of the A section by which the reducing agent disperser by 4th embodiment by this invention is arrange | positioned. It is a figure which shows the bias | inclination of the reducing agent injected in the exhaust pipe. It is a figure which shows the bias | inclination of the reducing agent injected in the exhaust pipe. It is an enlarged view of the partition surface.

Explanation of symbols

5 Exhaust pipe 7 Reducing agent supply valve 11 Exhaust gas flow 12 Deflection plate

Claims (6)

  In an exhaust gas purification apparatus for an internal combustion engine, a reducing agent supply valve is disposed in an exhaust passage upstream of a catalyst, and exhaust gas is purified in the catalyst by the reducing agent injected from the reducing agent supply valve. A deflecting member is disposed in the exhaust passage, and the deflecting member controls the inclination angle of the exhaust passage with respect to the axial direction of the exhaust passage so that the flow of exhaust gas is directed to the wall surface direction where the reducing agent supply valve is disposed and the opposite wall surface direction. The deflection direction of the exhaust gas flow including the injected reducing agent can be changed according to the increase in the flow rate of the exhaust gas flow in the exhaust passage when the reducing agent is injected from the reducing agent supply valve. An exhaust emission control device for an internal combustion engine that controls an inclination angle of a deflection member so as to change from a wall surface direction in which a reducing agent supply valve is disposed to a wall surface direction on the opposite side.   2. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein the inclination angle of the deflecting member is controlled to a position where the resistance to the exhaust gas flow received by the deflecting member is minimized except when the reducing agent is injected from the reducing agent supply valve. .   The exhaust emission control device for an internal combustion engine according to any one of claims 1 and 2, wherein at least two deflecting members are arranged in parallel to the exhaust gas flow.   4. An exhaust emission control device for an internal combustion engine according to claim 3, wherein the deflection member disposed near the wall surface opposite to the deflection direction is controlled to an inclination angle that largely deflects the flow of exhaust gas containing the reducing agent that is injected.   In an exhaust gas purification apparatus for an internal combustion engine, a reducing agent supply valve is disposed in an exhaust passage upstream of a catalyst, and exhaust gas is purified in the catalyst by the reducing agent injected from the reducing agent supply valve. A mesh member having a breathable mesh surface is disposed in the exhaust passage, and the mesh surface temporarily holds and holds the reducing agent injected from the reducing agent supply valve to vaporize or atomize the mesh surface and the exhaust passage. The angle of inclination formed by the axial direction of the nozzle is the angle at which the mesh surface adheres to or retains the reducing agent when the reducing agent is injected from the reducing agent supply valve, except when the reducing agent is injected from the reducing agent supply valve. An exhaust purification device for an internal combustion engine that controls an angle at which resistance to an exhaust gas flow received by a mesh surface is minimized.   In an exhaust gas purification apparatus for an internal combustion engine, a reducing agent supply valve is disposed in an exhaust passage upstream of a catalyst, and exhaust gas is purified in the catalyst by the reducing agent injected from the reducing agent supply valve. A reducing agent holding member having an adhesion holding portion that temporarily holds and vaporizes the reducing agent is disposed in the exhaust passage, the photocatalytic material having a photocatalytic action is provided in the adhesion holding portion, and light is applied to the photocatalytic material in the exhaust passage. An exhaust gas purification apparatus for an internal combustion engine that includes a light source that irradiates and deposits adhering to the adhesion holding part by oxidation and photocatalysis.

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