JP2011247188A - Exhaust apparatus for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the increase in cost caused by properly supplying fuel in a structure for supplying the fuel to a catalyst convertor and an ignition device from a common fuel addition valve disposed in an exhaust passage.SOLUTION: By driving a movable collision plate 50, an advancing state where the movable collision plate 50 interferes in a fuel orbit from the fuel addition valve 7 and a receding state where the movable collision plate 50 recedes from the fuel orbit are achieved. In the advancing state, supply of the fuel to a glow plug 21 is propelled, while in the receding state, the supply of the fuel to the glow plug 21 is prevented. A plurality of the fuel addition valves have to be provided for supplying the fuel to a pre-processing catalyst convertor 8 and the glow plug 21, thereby preventing the increase in costs.

Description

  The present invention relates to an exhaust device capable of supplying fuel to an exhaust passage of an internal combustion engine.

  For the purpose of purifying exhaust gas, an exhaust device that supplies fuel to an exhaust passage of an internal combustion engine has been proposed.

  In the apparatus disclosed in Patent Document 1, ignition means such as a glow plug is disposed at a position where fuel from a fuel addition valve provided in an exhaust passage directly contacts, and a catalyst is provided downstream of these fuel addition valve and glow plug. A converter is arranged. The fuel is ignited by the ignition means, and the catalytic converter is heated by the flame.

JP 2006-112401 A

  However, the apparatus of Patent Document 1 cannot change the ratio of the amount of fuel supplied to the ignition means and the amount of fuel supplied directly to the catalytic converter without going through the ignition means. However, it is necessary to provide a fuel addition valve for supplying to the ignition means and a fuel addition valve for supplying to the catalytic converter, which may increase the cost.

  An object of the present invention is to suppress an increase in cost when fuel is suitably supplied to a catalytic converter and an ignition device from a common fuel addition valve disposed in an exhaust passage. And

The first aspect of the present invention is:
A catalytic converter disposed in the exhaust passage of the internal combustion engine;
A fuel addition valve that is disposed upstream of the catalytic converter and supplies fuel into the exhaust passage;
An ignition device capable of igniting the fuel supplied from the fuel addition valve;
A movable collision member for causing the fuel from the fuel addition valve to collide and guiding the fuel to an ignition part of the ignition device;
An exhaust system for an internal combustion engine, comprising: drive means for rotating the movable collision member about a predetermined rotation axis.

  In this aspect, the fuel from the fuel addition valve is supplied to the catalytic converter, and the ignition device can ignite the fuel supplied from the fuel addition valve. The movable collision member collides the fuel from the fuel addition valve and guides it to the ignition part of the ignition device. Then, the driving means drives the movable collision member to rotate the movable collision member around a predetermined rotation axis. By changing the posture of the movable collision member, the trajectory of the fuel that collides with the movable collision member changes, and the ratio of the fuel supplied to the catalytic converter and the ignition device changes. Therefore, in the configuration in which the fuel is supplied to the catalytic converter and the ignition device, it is not necessary to provide a plurality of fuel addition valves when supplying the fuel to both of them appropriately, and an increase in cost can be suppressed.

  Preferably, the predetermined rotation axis intersects the exhaust flow direction. Preferably, the driving means realizes a deployed state in which the movable collision member interferes with the fuel trajectory from the fuel addition valve and a retracted state in which the movable collision member is retracted from the fuel trajectory. In these aspects, the fuel trajectory can be greatly changed with a simple configuration.

  Preferably, the driving means further realizes a cleaning operation state of the movable collision member. In this aspect, the function of the movable collision member can be maintained or recovered.

  Preferably, the driving means further realizes a standby state in which the exhaust resistance of the movable collision member is minimized. In this aspect, exhaust resistance due to the movable collision member can be suppressed.

  Preferably, the movable collision member is plate-shaped, and in the standby state, the thickness direction of the movable collision member is orthogonal to the exhaust flow direction. In this aspect, the exhaust resistance can be suitably suppressed by reducing the front projection area.

  Preferably, the movable collision member is disposed adjacent to the at least one so that at least one of the fuel addition valve and the ignition device can be cleaned by its operation. In this aspect, the function of at least one of the fuel addition valve and the ignition device can be maintained or recovered.

  The means for solving the problems in the present invention can be used in combination as much as possible.

  According to the present invention, in the configuration in which fuel is supplied to the catalytic converter and the ignition device, an increase in cost can be suppressed when fuel is preferably supplied to both.

It is a conceptual diagram of embodiment of this invention. It is a principal part enlarged view which shows the burner apparatus of the state which expand | deployed the movable collision board. It is sectional drawing which looked at the burner apparatus of the state which expand | deployed the movable collision board in the axial direction. It is a principal part enlarged view which shows the burner apparatus of the state which retracted the movable collision board.

  Preferred embodiments of the present invention will be described in detail below. However, it should be noted that the embodiments of the present invention are not limited to the following embodiments, and the present invention includes all modifications and applications included in the concept of the present invention defined by the claims. I must. The dimensions, materials, shapes, and relative arrangements of the constituent elements described as the embodiments are not intended to limit the technical scope of the invention only to those unless otherwise specified.

  FIG. 1 shows a schematic configuration of an engine body 1 and its intake and exhaust system in the embodiment. The engine body 1 is an on-vehicle four-cycle diesel engine. An intake pipe 2 and an exhaust pipe 3 (exhaust passage) are connected to the engine body 1. An air flow meter 4 that outputs a signal corresponding to the flow rate of the intake air flowing through the intake pipe 2 is provided in the middle of the intake pipe 2. The air flow meter 4 measures the amount of intake air into the engine body 1. The engine body 1 has a plurality of cylinders, and each cylinder is provided with an in-cylinder fuel injection valve 9. However, only a single in-cylinder fuel injection valve 9 is shown in FIG.

The end of the exhaust pipe 3 is connected to a silencer (not shown), and is opened to the atmosphere at the outlet of the silencer. In the middle of the exhaust pipe 3, the oxidation catalytic converter 6 and the NOx catalytic converter 26 are arranged in series in this order. The oxidation catalytic converter 6 reacts unburned components such as HC and CO with O ₂ to make CO, CO ₂ , H ₂ O and the like. As the catalyst material, for example, Pt / CeO ₂ , Mn / CeO ₂ , Fe / CeO ₂ , Ni / CeO ₂ , Cu / CeO ₂ or the like can be used. The NOx catalytic converter 26 preferably comprises an NOx storage reduction (NSR) converter. The NOx catalytic converter 26 occludes NOx in the exhaust when the oxygen concentration of the inflowing exhaust gas is high, and occludes when the oxygen concentration of the inflowing exhaust gas decreases and a reducing component (for example, fuel) exists. It has a function of reducing NOx. The NOx catalytic converter 26 is configured such that a noble metal such as platinum Pt as a catalyst component and a NOx absorption component are supported on the surface of a base material made of an oxide such as alumina Al ₂ O ₃ . The NOx absorbing component is at least one selected from, for example, an alkali metal such as potassium K, sodium Na, lithium Li, and cesium Cs, an alkaline earth such as barium Ba and calcium Ca, and a rare earth such as lanthanum La and yttrium Y. It consists of one. The NOx catalytic converter 26 may be a selective reduction type NOx catalytic converter (SCR: Selective Catalytic Reduction).

  A fuel addition valve 7, a pretreatment catalytic converter 8, and a glow plug 21 are disposed upstream of the oxidation catalytic converter 6 in the exhaust pipe 3. These fuel addition valve 7, pretreatment catalytic converter 8, and glow plug 21 constitute a burner device 30. The burner device 30 is disposed on the downstream side of a collecting portion of an exhaust manifold (not shown) connected to the engine body 1. The fuel addition valve 7 can add liquid fuel (light oil) into the exhaust.

  The fuel tank 11 is connected to the fuel addition valve 7 through a fuel suction pipe 12, a low pressure fuel pump 13, a high pressure fuel pump 14 and a fuel supply pipe 15. The fuel pumps 13, 14 suck the fuel stored in the fuel tank 11 through the fuel suction pipe 12 and discharge it to the fuel supply pipe 15, whereby the fuel is supplied to the fuel addition valve 7. A pipe 27 branches to the downstream side of the high-pressure fuel pump 14 and is connected to the in-cylinder fuel injection valve 9 installed in the engine body 1. Although details are not shown, the piping 27 branches toward the in-cylinder fuel injection valves 9 corresponding to the number of cylinders. The fuel pumps 13 and 14 are, for example, mechanical, and operate using a driving force of an output shaft (crankshaft) (not shown) of the engine body 1. Note that at least one of the fuel pumps 13 and 14 may be electrically operated, and a separate high-pressure fuel pump may be provided for the fuel addition valve 7 and the in-cylinder fuel injection valve 9.

  As shown in FIGS. 2 and 3, the fuel addition valve 7 is disposed in the exhaust pipe 3 in a posture in which the main body shaft 7 a is inclined toward the downstream side. The fuel addition valve 7 has a single injection hole 7b. The nozzle hole shaft 7 c of the nozzle hole 7 b coincides with the main body shaft 7 a and includes a component in a direction crossing the exhaust pipe 3.

  A pretreatment catalytic converter 8 for reforming the fuel injected from the fuel addition valve 7 is provided in a portion of the exhaust pipe 3 between the fuel addition valve 7 and the oxidation catalytic converter 6. The pretreatment catalytic converter 8 can be configured as an oxidation catalytic converter in which rhodium or the like is supported on a zeolite carrier, for example.

  When the fuel is supplied to the pretreatment catalytic converter 8, if the pretreatment catalytic converter 8 is activated at that time, the fuel is oxidized in the pretreatment catalytic converter 8. The temperature of the processing catalytic converter 8 is raised. Further, when the temperature of the pretreatment catalytic converter 8 is increased, hydrocarbons having a large number of carbon atoms in the fuel are decomposed to generate hydrocarbons having a small number of carbon atoms and high reactivity, whereby the fuel is a highly reactive fuel. To be modified. In other words, the pretreatment catalytic converter 8 constitutes a rapid heat generator that rapidly generates heat on the one hand, and a reformed fuel discharger that discharges the reformed fuel on the other hand.

  As shown in FIGS. 2 and 3, the exhaust pipe 3 is formed in a substantially cylindrical shape. The outer diameter of the pretreatment catalytic converter 8 is smaller than the inner diameter of the exhaust pipe 3, and when the pretreatment catalytic converter 8 is accommodated in the exhaust pipe 3, the outer peripheral surface of the pretreatment catalytic converter 8 and the inner peripheral surface of the exhaust pipe 3. Exhaust gas can pass through the catalyst bypass route, which is a gap between the exhaust gas and the catalyst. The pretreatment catalytic converter 8 is a so-called straight flow type in which individual cells communicate from upstream to downstream. The pretreatment catalytic converter 8 is disposed in a substantially cylindrical outer frame 8a, and the outer frame 8a is supported in the exhaust pipe 3 by a plurality of stays 8b disposed in a generally radial manner. The pretreatment catalytic converter 8 is surrounded by a catalyst detour around substantially the entire circumference except for the stay 8b. A lower portion of the front end portion of the outer frame 8a is a hook-shaped protruding portion 8c protruding toward the upstream side.

  The glow plug 21 is disposed downstream of the fuel addition valve 7 and upstream of the pretreatment catalytic converter 8. As shown in FIG. 1, the glow plug 21 is connected to an in-vehicle DC power supply 23 via a booster circuit 22, and ignites the fuel supplied from the fuel addition valve 7 by heat generated when energized. It is possible. The glow plug 21 has an axial center that is horizontal and orthogonal to the exhaust flow direction a, but may be arranged in other postures. In the present embodiment, the tip end portion of the glow plug 21 is the heat generating portion 21a (see FIG. 3), but the ignition portion may be the entire portion in the exhaust pipe 3 of the glow plug 21. In addition, as an ignition means, other apparatuses, such as a ceramic heater and a spark plug, especially an electrothermal type or a spark ignition type apparatus can be used suitably.

  On the other hand, a movable collision plate 50 is disposed adjacent to the upstream side of the heat generating portion 21 a at the tip of the glow plug 21. The movable collision plate 50 is disposed at a position deflected upward in the exhaust pipe 3. As shown in FIG. 3 as a track 50d on the outer peripheral portion, the movable collision plate 50 is composed of a substantially flat elliptical plate-like main body 50a and a shaft 50b fixed along the major axis. 50b is supported by the exhaust pipe 3 so that turning is possible.

  As shown in FIG. 3, the rotary actuator 41 is fixed to the shaft 50 a of the movable collision plate 50. By the operation of the rotary actuator 41, the movable collision plate 50 can take an arbitrary posture in the rotation direction. The rotary actuator 41 is fixed to the exhaust pipe 3 by a stay (not shown). Various mechanisms such as a stepping motor and a rotary solenoid can be adopted for the rotary actuator 41.

  The movable collision plate 50 can be formed of a material excellent in heat resistance and impact resistance such as SUS. The fuel addition valve 7 injects the fuel obliquely downward toward the movable collision plate 50. The trajectory of the fuel supplied from the fuel addition valve 7 includes a component in a direction crossing the exhaust pipe 3. The movable collision plate 50 promotes atomization and atomization of the fuel when the fuel collides, and improves dispersibility and diffusibility.

  As shown in FIG. 2, the distance d2 in the transverse direction of the exhaust pipe 3 between the collision point 50c of the movable collision plate 50 where the fuel supplied from the fuel addition valve 7 collides and the injection hole 7b of the fuel addition valve 7 is as follows. The distance d1 in the transverse direction of the exhaust pipe 3 between the collision point 8d of the protrusion 8c where the fuel supplied from the fuel addition valve 7 collides and the injection hole 7b of the fuel addition valve 7 is smaller. In other words, the collision point 50a of the movable collision plate 50 and the collision point 8d of the protrusion 8c are arranged at different positions with respect to the width direction (that is, the transverse direction) of the exhaust pipe 3. 2 and 4, the collision points 8d and 50c are drawn on the nozzle hole shaft 7c, respectively, but the actual position of the collision point may be deflected downstream by the exhaust flow. Further, the protruding portion 8c can be omitted, and in this case, it is preferable to cause the fuel to collide with the pipe wall of the exhaust pipe 3.

  As shown in FIGS. 2 and 3, when the movable collision plate 50 is tilted slightly upstream from the horizontal, the movable collision plate 50 interferes with the fuel trajectory from the fuel addition valve 7. This state is referred to as a developed state of the movable collision plate 50. In the deployed state, the injected fuel collides with the movable collision plate 50 at the collision point 50 c and atomizes, and is mainly supplied to the heat generating portion 21 a of the glow plug 21.

  On the other hand, as shown in FIG. 4, when the movable collision plate 50 is inclined slightly upstream from the vertical, the movable collision plate 50 is retracted without interfering with the fuel trajectory from the fuel addition valve 7. This state is referred to as a retracted state of the movable collision plate 50. In the retracted state, the injected fuel collides with the protrusion 8c at the collision point 8d and atomizes, and is mainly supplied to the pretreatment catalytic converter 8.

  Further, the track 50d on the outer peripheral portion of the movable collision plate 50 is disposed in the vicinity of the nozzle hole 7b of the fuel addition valve 7 and the heat generating portion 21a of the glow plug 21, and when the movable collision plate 50 rotates, Deposits such as PM (particulate matter) and sludge adhering to the vicinity of the injection hole 7b of the fuel addition valve 7 and each surface of the glow plug 21 can be scraped off.

  The engine body 1 is provided with an ECU 10 that is an electronic control unit for controlling the driving state in accordance with the operating conditions of the engine body 1 and the driver's request. The ECU 10 includes a CPU that executes various arithmetic processes related to the control of the engine body 1, a ROM that stores programs and data necessary for the control, a RAM that temporarily stores arithmetic results of the CPU, and the like. An input / output port for inputting / outputting signals is provided.

  In addition to the air flow meter 4, the ECU 10 includes a crank position sensor 24 that detects the crank angle of the engine body 1, an accelerator opening sensor 25 that outputs an electric signal corresponding to the accelerator opening, and exhaust gas downstream of the NOx catalytic converter 26. A NOx sensor 32 arranged in the passage, a water temperature sensor 33 for detecting the engine cooling water temperature, a SOx sensor 34 made of a solid electrolyte provided in the vicinity of the inlet of the NOx catalytic converter 26, and a vehicle speed arranged in the vicinity of a driving wheel (not shown). Various sensors including a vehicle speed sensor 35 for detecting the above are connected via electric wiring, and these output signals are input to the ECU 10. Further, the ECU 10 is connected to the fuel addition valve 7, the in-cylinder fuel injection valve 9, and the like via electric wiring, and these on-off valves are controlled by the ECU 10. The ECU 10 can detect the engine speed based on the output value of the crank position sensor 24 and can detect the required load of the engine body 1 based on the output value of the accelerator opening sensor 25.

  In the present embodiment, the ECU 10 performs the fuel addition valve 7 as a temperature raising process by ignition of fuel, a PM oxidation process for the pretreatment catalytic converter 8 and the oxidation catalyst converter 6, a NOx reduction process for the NOx catalytic converter 26, and a SOx poisoning recovery process. And the fuel is injected into the exhaust gas, and this fuel is supplied to the pretreatment catalytic converter 8, the oxidation catalytic converter 6, and the NOx catalytic converter 26. Among these, the temperature raising process by the ignition of the fuel is performed in a deployed state in which the movable collision plate 50 is deployed, and almost all of the supplied fuel is supplied to the glow plug 21. During the temperature raising process, the glow plug 21 is heated by the control of the ECU 10. All other processes are performed in a retracted state in which the movable collision plate 50 is retracted, and almost all of the supplied fuel is supplied to the pretreatment catalytic converter 8. ECU10 can determine the timing which performs each process based on the detected value of each sensor mentioned above, and can set the injection quantity of the fuel injected to the fuel addition valve 7 for every control. it can.

  In addition, when the ECU 10 does not perform the above-described various processes using the injection from the fuel addition valve 7, the movable collision plate 50 is driven by the rotary actuator 41 so that the thickness direction of the movable collision plate 50 is the exhaust flow direction. A standby state orthogonal to (arrow a in FIG. 2) is further realized.

  Further, when the ECU 10 detects that an ignition switch (not shown) is turned off to stop the engine main body 1, the ECU 10 drives the movable collision plate 50 by the rotary actuator 41, and deposits on the movable collision plate 50. A cleaning operation that can remove the ink is performed. In this cleaning operation, the movable collision plate 50 is rotated continuously or intermittently over a predetermined number of rotations. By realizing this cleaning operation state, deposits such as PM (particulate matter) and sludge adhered to the surface of the movable collision plate 50 are removed, and these deposits adhered to the surfaces of the fuel addition valve 7 and the glow plug 21. Can also be scraped off.

  As described above, in the present embodiment, the movable actuator 41 drives the movable collision plate 50 under the control of the ECU 10 to rotate the movable collision plate 50 about the shaft 50b. As the posture of the movable collision plate 50 changes, the trajectory of the fuel that collides with the movable collision plate 50 changes, and the ratio of the fuel supplied to the pretreatment catalytic converter 8 and the glow plug 21 changes. Therefore, in the configuration in which the fuel is supplied to the catalytic converter and the ignition device, it is not necessary to provide a plurality of fuel addition valves when supplying the fuel to both of them appropriately, and an increase in cost can be suppressed.

  Further, the axis 50b, which is the rotation axis of the movable collision plate 50, is orthogonal to the exhaust flow direction, and the movable actuator 41 has a deployed state in which the movable collision plate 50 interferes with the fuel trajectory from the fuel addition valve, A retreat state of retreating from the fuel trajectory is realized. In the deployed state that interferes with the fuel trajectory, the supply of fuel from the nozzle hole 7b of the fuel addition valve 7 to the glow plug 21 is promoted. However, in the retracted state of retracting from the fuel trajectory, the fuel is supplied to the glow plug 21. It is suppressed. Therefore, the fuel trajectory can be greatly changed with a simple configuration.

  Further, deposits of deposits on the surface of the movable collision plate 50 may deteriorate the ignitability of the glow plug 21 by the injected fuel penetrating into the deposits. In this embodiment, the movable actuator 41 is movable. Since the cleaning operation state of the collision plate 50 is realized, the function of the movable collision plate 50 can be maintained or recovered.

  In this embodiment, since the rotary actuator 41 further realizes a standby state in which the exhaust resistance of the movable collision plate 50 is minimized, the exhaust resistance due to the movable collision plate 50 can be suppressed. Further, the movable collision member has a plate shape, and the rotary actuator 41 drives the movable collision plate 50 to further realize a standby state in which the thickness direction of the movable collision plate 50 is orthogonal to the exhaust flow direction. By reducing the front projection area of 50, the exhaust resistance can be suitably suppressed.

  In the present embodiment, the movable collision plate 50 is disposed close to the fuel addition valve 7 and the glow plug 21 so as to be able to clean the fuel addition valve 7 and the glow plug 21 by the operation thereof. It can be maintained or recovered.

  Although the invention has been described with a certain degree of particularity, it should be understood that various modifications and changes can be made without departing from the spirit and scope of the claimed invention. Embodiments of the present invention are not limited to the above-described embodiments, and the present invention includes all modifications and applications included in the concept of the present invention defined by the claims. Therefore, the present invention should not be construed as being limited, and can be applied to any other technique belonging to the scope of the idea of the present invention. The means for solving the problems in the present invention can be used in combination as much as possible.

  For example, the arrangement method and shape of the movable collision plate 50 are appropriately changed within a range having a function of atomizing the fuel injected from the fuel addition valve 7 and a function of guiding the fuel to the pretreatment catalytic converter 8. Can do. The direction of the rotational axis of the movable collision plate may be a direction that intersects the exhaust flow direction at an angle other than a right angle, or may be a direction that does not intersect (that is, parallel to the exhaust flow). The movable collision plate 50 may be provided with an arbitrary number of through holes, concave portions and / or convex portions. The vertical cross section and / or the horizontal cross section of the movable collision plate 50 may not be a straight shape but may be a curved shape such as an arc. Although the movable collision plate 50 is configured to be axially symmetric, other arbitrary structures such as one having a rotation shaft at the upstream end can be employed, and the movable collision plate 50 may not be plate-shaped. When a movable collision member having a complicated shape that is not a plate is employed, a posture in which the exhaust resistance is minimized can be set as a standby posture.

  The movable collision plate 50 is arranged so that both the fuel addition valve 7 and the glow plug 21 can be cleaned. However, only one of them may be cleaned, and as long as the movable collision plate 50 can be cleaned, the desired effect is achieved in the present invention. Obtainable.

  As the driving means for driving the movable collision member, other configurations such as those using a diaphragm or a hydraulic actuator can be arbitrarily adopted.

  At least one of the pretreatment catalytic converter and the exhaust pipe may have a non-circular cross section such as an ellipse or an oval cross section. The interval in the transverse direction of the exhaust pipe 3 may be such that the pretreatment catalytic converter 8 is closer to the fuel addition valve 7 than the heat generating portion of the glow plug 21 (ignition device). The cross section of the pretreatment catalytic converter 8 in the transverse direction of the exhaust pipe 3 may extend over the entire interior of the exhaust pipe 3. The type and order of other exhaust treatment apparatuses existing downstream of the pretreatment catalytic converter 8 are also arbitrary.

1 Engine Body 3 Exhaust Pipe 6 Oxidation Catalytic Converter 7 Fuel Addition Valve 8 Pretreatment Catalytic Converter 9 In-Cylinder Fuel Injection Valve 10 ECU
21 Glow plug 26 NOx catalytic converter 30 Burner device 41 Rotary actuator 50 Movable collision plate

Claims (7)

A catalytic converter disposed in the exhaust passage of the internal combustion engine;
A fuel addition valve that is disposed upstream of the catalytic converter and supplies fuel into the exhaust passage;
An ignition device capable of igniting the fuel supplied from the fuel addition valve;
A movable collision member for causing the fuel from the fuel addition valve to collide and guiding the fuel to an ignition part of the ignition device;
An exhaust system for an internal combustion engine, comprising: driving means for rotating the movable collision member about a predetermined rotation axis. An exhaust system for an internal combustion engine according to claim 1,
An exhaust system for an internal combustion engine, wherein the predetermined rotation axis intersects the exhaust flow direction. An exhaust system for an internal combustion engine according to claim 1 or 2,
The drive means drives the movable collision member to realize a deployed state where the movable collision member interferes with a fuel trajectory from the fuel addition valve and a retracted state where the movable collision member retracts from the fuel trajectory. An exhaust system for an internal combustion engine. An exhaust system for an internal combustion engine according to any one of claims 1 to 3,
The exhaust device for an internal combustion engine, wherein the driving means further realizes a cleaning operation state in which deposits on the movable collision member can be removed. An exhaust system for an internal combustion engine according to any one of claims 1 to 4,
The exhaust device for an internal combustion engine, wherein the driving means further realizes a standby state in which the exhaust resistance of the movable collision member is minimized. An exhaust system for an internal combustion engine according to claim 5,
The movable collision member is plate-shaped,
An exhaust system for an internal combustion engine, wherein in the standby state, the thickness direction of the movable collision member is perpendicular to the exhaust flow direction. An exhaust system for an internal combustion engine according to any one of claims 1 to 6,
The exhaust device for an internal combustion engine, wherein the movable collision member is disposed in proximity to at least one of the fuel addition valve and the ignition device so that the movable collision member can be cleaned by its operation.

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