JP2019167906A - Exhaust emission control system - Google Patents

Abstract

To reduce thermal damage of a filter. An exhaust gas purifying device is provided in an exhaust pipe through which exhaust gas exhausted from an engine passes (a filter accommodating portion), and a filter (GPF224) for trapping particulate matter contained in the exhaust gas. A falling part (bottom surface 230) provided on the upstream side of the filter, where the particulate matter trapped by the filter falls, and an exhaust pipe 140 (downstream exhaust pipe 140b) contacting the particulate matter and introduced from the falling part. And a communication pipe 226 that communicates between the falling part and the storage part 228. [Selection] Figure 2

Description

  The present invention relates to an exhaust gas purification device.

  DPF (Diesel Particulate Filter) and GPF (Gasoline Particulate Filter) are known as filters for vehicles that capture and remove particulate matter such as soot contained in exhaust gas exhausted from an engine. Such filters become clogged with particulate matter as they continue to be used. Therefore, a regeneration process is performed in which the trapped soot is burned and removed from the filter by raising the temperature of the filter.

  In addition, a technique has been developed in which the particulate matter trapped in the filter is dropped by its own weight by tilting the filter upward from the upstream side toward the downstream side (for example, Patent Document 1). In the technique of Patent Document 1, a storage unit is provided vertically below (directly below) the upstream opening of the filter, and the particulate matter dropped from the filter is stored in the storage unit.

Japanese Patent Laid-Open No. 10-159540

  In the technique of the above-mentioned Patent Document 1, since the filter is arranged right above the housing portion, the soot stored in the housing portion may burn during the regeneration process, and the filter may be thermally damaged.

  In view of such a problem, an object of the present invention is to provide an exhaust gas purification device capable of reducing thermal damage of a filter.

  In order to solve the above problems, an exhaust gas purification apparatus of the present invention is provided in an exhaust pipe through which exhaust gas exhausted from an engine passes, and captures particulate matter contained in the exhaust gas, upstream of the filter The falling part where the particulate matter captured by the filter falls, the storage part that contacts the exhaust pipe and stores the particulate matter introduced from the dropping part, and the dropping part and the storage part are communicated with each other. And a communication pipe.

  Moreover, the cross-sectional area of the communication pipe may be smaller than that of the exhaust pipe.

  Further, one or a plurality of grooves may be formed in the dropping part.

  Moreover, you may provide the vibration provision part which vibrates a filter.

  According to the present invention, it is possible to reduce the thermal damage of the filter.

It is the schematic which shows the structure of an engine system. It is the schematic which shows the structure of an exhaust-gas purification apparatus. It is a figure explaining GPF. It is a figure explaining the bottom face of a filter accommodating part. It is a figure explaining a vibration provision part. It is a figure explaining the modification of a groove part.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a schematic diagram showing the configuration of the engine system 100. In FIG. 1, the signal flow is indicated by broken arrows. As shown in FIG. 1, the engine system 100 is provided with an ECU (Engine Control Unit) 110 formed of a microcomputer including a central processing unit (CPU), a ROM storing programs and the like, a RAM as a work area, and the like. The ECU 110 performs overall control of the engine 120. However, the configuration and processing related to the present embodiment will be described in detail below, and the description of the configuration and processing unrelated to the present embodiment will be omitted. Here, a gasoline engine will be described as an example of the engine 120.

  The engine 120 is a multi-cylinder engine having a plurality of cylinders 122a, and an intake manifold 126 is communicated with an intake port 124 of each cylinder 122a formed in the cylinder block 122. An intake pipe 130 is communicated with a collecting portion of the intake manifold 126 through an air chamber 128. An air cleaner 132 is provided on the upstream side of the intake pipe 130. A throttle valve 134 is provided on the downstream side of the air cleaner 132 in the intake pipe 130.

  An exhaust manifold 138 communicates with the exhaust port 136 of each cylinder 122 a formed in the cylinder block 122 of the engine 120. A muffler 142 is communicated with a collecting portion of the exhaust manifold 138 through an exhaust pipe 140. The exhaust pipe 140 is provided with an exhaust gas purification device 200 described later. Hereinafter, the exhaust pipe 140 that communicates the collecting portion of the exhaust manifold 138 and the filter unit 220 (described later) constituting the exhaust gas purification apparatus 200 is referred to as an upstream exhaust pipe 140a, and the exhaust that communicates the filter unit 220 and the muffler 142. The pipe 140 may be referred to as a downstream exhaust pipe 140b. The upstream exhaust pipe 140a and the downstream exhaust pipe 140b have substantially the same inner diameter.

  The engine 120 is provided with a spark plug 148 for each of the cylinders 122a so that the tip thereof is located in the combustion chamber 146. An injector 150 is provided in the combustion chamber 146 of each cylinder 122a.

  The engine system 100 includes an intake air amount sensor 160 that detects an intake air amount flowing into the engine 120 between an air cleaner 132 and a throttle valve 134 in the intake pipe 130, and air (outside air) that flows into the engine 120. An intake air temperature sensor 162 that detects the temperature is provided. The engine system 100 is also provided with a throttle opening sensor 164 that detects the opening of the throttle valve 134. The engine system 100 is also provided with a crank angle sensor 166 that detects the crank angle of the crankshaft and an accelerator opening sensor 168 that detects the opening of an accelerator (not shown).

  Each of these sensors 160 to 168 is connected to ECU 110, and outputs a signal indicating the detected value to ECU 110.

  ECU 110 acquires signals output from sensors 160 to 168 and controls engine 120. When the ECU 110 controls the engine 120, the signal acquisition unit 180, the target value derivation unit 182, the air amount determination unit 184, the injection amount determination unit 186, the throttle opening determination unit 188, the ignition timing determination unit 190, and the drive control unit 192. Function as.

  The signal acquisition unit 180 acquires signals indicating values detected by the sensors 160 to 168. The target value deriving unit 182 derives the current engine speed based on the signal indicating the crank angle acquired from the crank angle sensor 166. Further, the target value deriving unit 182 refers to the pre-stored map based on the derived engine speed and a signal indicating the accelerator opening acquired from the accelerator opening sensor 168, and the target torque and the target engine speed. Is derived.

  The air amount determination unit 184 determines a target air amount to be supplied to each cylinder 122a based on the target engine speed and the target torque derived by the target value deriving unit 182. The throttle opening determination unit 188 derives the total target air amount of each cylinder 122a determined by the air amount determination unit 184, and determines the target throttle opening for intake of the total amount of air from the outside.

  The injection amount determining unit 186 supplies each cylinder 122a based on the target engine speed and target torque derived by the target value deriving unit 182 and the target air amount of each cylinder 122a determined by the air amount determining unit 184. The target fuel injection amount is determined. Further, the injection amount determination unit 186 is based on a signal indicating the crank angle detected by the crank angle sensor 166 in order to inject the fuel of the determined target injection amount from the injector 150 in the intake stroke or compression stroke of the engine 120. The target injection timing and target injection period of each injector 150 are determined.

  Based on the target engine speed and target torque derived by the target value deriving unit 182, a signal indicating the crank angle detected by the crank angle sensor 166, etc., the ignition timing determining unit 190 is a spark plug 148 in each cylinder 122 a. The target ignition timing is determined.

  The drive control unit 192 drives a throttle valve actuator (not shown) so that the throttle valve 134 opens at the target throttle opening determined by the throttle opening determination unit 188. Further, the drive control unit 192 drives the injector 150 at the target injection timing and the target injection period determined by the injection amount determination unit 186, thereby causing the injector 150 to inject fuel of the target injection amount. Further, the drive control unit 192 ignites the spark plug 148 at the target ignition timing determined by the ignition timing determination unit 190.

  In this manner, the exhaust gas generated by burning the fuel in the combustion chamber 146 is discharged to the outside through the exhaust pipe 140. Since exhaust gas contains hydrocarbons (HC: Hydro Carbon), carbon monoxide (CO), nitrogen oxides (NOx), particulate matter such as soot, it is necessary to remove them. Therefore, an exhaust gas purification device 200 is provided in the exhaust pipe 140, and the exhaust gas purification device 200 removes hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter.

(Exhaust gas purification device 200)
FIG. 2 is a schematic diagram showing the configuration of the exhaust gas purification device 200. In FIG. 2, the vehicle body of the vehicle on which the engine 120 is mounted is indicated by a one-dot chain line. As shown in FIG. 2, the exhaust gas purification apparatus 200 includes a three-way catalyst 210, a filter unit 220, and a vibration applying unit 250. In the present embodiment, the exhaust gas purification device 200 is provided below the vehicle body.

  The three-way catalyst 210 is provided in the upstream exhaust pipe 140a. The three-way catalyst 210 includes a catalyst component such as platinum (Pt), palladium (Pd), rhodium (Rh), for example. The three-way catalyst 210 removes hydrocarbons, carbon monoxide, and nitrogen oxides in the exhaust gas discharged from the exhaust port 136.

  The filter unit 220 includes a filter housing part 222 (exhaust pipe), a GPF (filter) 224, a communication pipe 226, and a storage part 228. The filter housing part 222 connects the upstream exhaust pipe 140a and the downstream exhaust pipe 140b. The upstream exhaust pipe 140a and the filter housing part 222 are connected such that these communicating portions 222a are located away from the vehicle body from the center of the flow path cross section of the filter housing part 222. Further, the filter housing portion 222 and the downstream exhaust pipe 140b are connected so that these communication portions 222b are located on the vehicle body side from the center of the flow path cross section of the filter housing portion 222. The upstream exhaust pipe 140a, the filter unit 220, and the downstream exhaust pipe 140b are arranged along the bottom surface (horizontal direction) of the vehicle body, and the cross section of the flow path is perpendicular to the extending direction of the upstream exhaust pipe 140a. Is a cross-section in the direction of

  The GPF 224 is provided in the filter housing portion 222. That is, the GPF 224 is provided on the downstream side of the three-way catalyst 210 in the exhaust pipe 140. The GPF 224 captures particulate matter (soot) in the exhaust gas exhausted from the exhaust port 136. The GPF 224 is supported by a stopper (not shown).

  FIG. 3 is a diagram for explaining the GPF 224. FIG. 3A is a perspective view of the GPF 224. FIG. 3B is a front view of the GPF 224. FIG. 3C is an XZ sectional view of the GPF 224. In FIG. 3A, the flow of exhaust gas is indicated by white arrows, and in FIG. 3C, the flow of exhaust gas is indicated by solid arrows. Further, in FIG. 3 of the present embodiment, the X axis, the Y axis, and the Z axis (exhaust gas flow direction) that intersect perpendicularly are defined as illustrated. Further, in FIG. 3A to FIG. 3C, the cell 316 is shown larger than the outer cylinder 312 for easy understanding.

  As shown in FIGS. 3A to 3C, the GPF 224 is a wall flow type filter. The GPF 224 includes a filter unit 310, an upstream plug unit 320, and a downstream plug unit 330.

  The filter unit 310 includes a cylindrical outer cylinder 312 and a filter wall 314 through which exhaust gas passes. The outer cylinder 312 is made of ceramic, for example.

  The filter wall 314 is made of ceramic, for example. The filter wall 314 has a plurality of holes through which exhaust gas passes while capturing particulate matter contained in the exhaust gas. In FIG. 3, the filter wall 314 is provided on a plane parallel to the XZ plane, the first wall 314a extending in the Z-axis direction, and provided on a plane parallel to the YZ plane, and in the Z-axis direction. And an extending second wall 314b. Then, as shown in FIG. 3B, the space surrounded by the two first walls 314a and the two second walls 314b, or the first wall 314a, the second wall 314b, and the outer cylinder 312 is surrounded. A space is formed as a cell 316.

  Accordingly, the plurality of cells 316 extend in the axial direction of the outer cylinder 312 (Z-axis direction in FIG. 3) in the outer cylinder 312 (filter unit 310) and in a direction orthogonal to the axial direction (in FIG. 3). , X axis direction and Y axis direction). In GPF 224, cells 316A classified into the first cell group and cells 316B classified into the second cell group are alternately arranged. That is, the cells 316A and the cells 316B are alternately arranged adjacent to each other.

  As shown in FIG. 3C, the upstream plug portion 320 seals the upstream opening 318a on the upstream side of the cell 316A that is classified into the first cell group among the cells 316. The upstream plug portion 320 is made of, for example, ceramic.

  As shown in FIG. 3C, the downstream plug portion 330 seals the downstream opening 318b on the downstream side of the cell 316B (classified as the second cell group) other than the cell 316A. The downstream plug portion 330 is made of ceramic, for example.

  In the present embodiment, the GPF 224 has a function of trapping particulate matter, a function as a three-way catalyst for purifying exhaust gas, and a function as OSC (Oxygen Storage capacity). More specifically, the filter wall 314 constituting the GPF 224 carries the catalyst component constituting the three-way catalyst and the OSC material.

  As described above, the exhaust gas purification apparatus 200 can capture (deposit) the particulate matter on the GPF 224 and remove it from the exhaust gas by the configuration in which the exhaust pipe 140 includes the GPF 224. However, as particulate matter accumulates on the GPF 224, the GPF 224 is clogged, and the pressure loss increases.

  Therefore, the exhaust gas purification apparatus 200 drops the particulate matter captured by the GPF 224 to the upstream side of the GPF 224. Specifically, as shown in FIG. 2, the GPF 224 partitions the inside of the filter housing portion 222 into an upper space U and a lower space D. Here, the upper space U is a space communicating with the downstream exhaust pipe 140b in the filter housing portion 222, and is provided on the vehicle body side. The lower space D is a space communicating with the upstream exhaust pipe 140a in the filter accommodating portion 222, and is provided at a position separated from the vehicle body. The GPF 224 is provided in the filter housing portion 222 so that the downstream opening 318 b of the cell 316 faces the upper space U and the upstream opening 318 a of the cell 316 faces the lower space D. Therefore, the exhaust gas flows as an upward flow from the upstream opening 318a of the GPF 224 toward the downstream opening 318b, that is, from the lower side to the upper side.

  Furthermore, in the present embodiment, the GPF 224 is provided in the filter housing portion 222 so that the axial direction of the upstream exhaust pipe 140a and the downstream exhaust pipe 140b intersects the axial direction of the outer cylinder 312. For example, the GPF 224 includes the filter housing portion 222 such that the axial direction of the outer cylinder 312 is the vertical direction, or the axial direction of the outer cylinder 312 is inclined more than 0 degrees and less than 45 degrees downstream from the vertical direction. It is provided in the inside. That is, the upstream opening 318 a is provided facing the bottom surface (falling portion) 230 of the filter housing portion 222. Therefore, when the engine 120 is stopped and the exhaust gas does not pass through the GPF 224, the particulate matter captured by the GPF 224 falls to the bottom surface 230 by its own weight. As shown in FIG. 2, the bottom surface 230 inclines vertically downward from the upstream exhaust pipe 140a toward the communication pipe 226.

  4A and 4B are diagrams for explaining the bottom surface 230 of the filter housing portion 222. FIG. 4A is a top view of the bottom surface 230, and FIG. 4B is a cross-sectional view taken along the line IVb in FIG. FIG. In FIG. 4, the GPF 224 is indicated by a broken line for easy understanding.

  As shown in FIGS. 4A and 4B, the bottom surface 230 is formed with a groove 240 that is depressed downward. The groove part 240 includes a first groove part 240a and a second groove part 240b. The first groove 240a extends from the upstream exhaust pipe 140a toward the communication pipe 226. In the present embodiment, a plurality (three) of first groove portions 240a are provided. The second groove part 240b is connected to the first groove part 240a. The bottom surface of the second groove portion 240b is continuous with the bottom surface of the communication pipe 226.

  As shown in FIG. 4B, the bottom surface 230 is inclined downward from the side surface 230a of the filter housing portion 222 toward the first groove portion 240a. Furthermore, the top part 240ab is formed between the adjacent 1st groove parts 240a, and the bottom face 230 inclines vertically downward toward the 1st groove part 240a from the top part 240ab.

  Therefore, as shown by a solid arrow in FIG. 4B, the particulate matter that has fallen off from the GPF 224 and dropped onto the bottom surface 230 is guided to the first groove 240a. Therefore, it is possible to suppress stagnation of particulate matter at a location where the exhaust gas flow rate is high (a region surrounded by a one-dot chain line in FIG. 4B). As a result, the amount of particulate matter that is swept up by the exhaust gas can be reduced, and the amount of particulate matter that is reintroduced into the GPF 224 can be reduced.

  Further, as described above, the bottom surface 230 is inclined downward in the vertical direction from the upstream exhaust pipe 140a toward the communication pipe 226. That is, the first groove portion 240a is inclined downward in the vertical direction from the exhaust pipe 140 toward the communication pipe 226. Therefore, the particulate matter guided to the first groove portion 240a is guided to the second groove portion 240b by its own weight, and reaches the storage portion 228 via the second groove portion 240b and the communication pipe 226. Further, the particulate matter reaches the storage unit 228 along with the flow of the exhaust gas from the filter housing unit 222 toward the communication pipe 226 (storage unit 228).

  When the amount of particulate matter deposited on the GPF 224 exceeds a predetermined threshold, the ECU 110 supplies oxygen to the GPF 224 and raises the GPF 224 to a predetermined regeneration temperature (for example, 300 ° C. or more and 400 ° C. or less). Then, a regeneration process for burning the particulate matter (soot) is performed. At this time, oxygen is also introduced into the storage unit 228, and the particulate matter stored in the storage unit 228 also burns.

  Specifically, as shown in FIG. 2, the reservoir 228 is in contact with the downstream exhaust pipe 140b. For this reason, heat is exchanged between the reservoir 228 and the downstream exhaust pipe 140b, and the reservoir 228 rises to the regeneration temperature. Further, oxygen diffuses from the filter housing part 222 to the storage part 228 due to the difference between the oxygen concentration in the storage part 228 and the oxygen concentration in the filter storage part 222 (upstream exhaust pipe 140a) (difference in oxygen partial pressure). . That is, the oxygen concentration in the storage unit 228 is lower than in the filter housing unit 222. For this reason, oxygen is diffused from the filter housing part 222 to the storage part 228. Thereby, the particulate matter stored in the storage part 228 will combust.

  Thus, by providing the storage part 228 at a position retracted from the vertically lower side (directly below) of the GPF 224, heat (flame) generated by combustion of particulate matter in the storage part 228 is directly transmitted to the GPF 224. The situation can be avoided. Therefore, it becomes possible to reduce the thermal damage of the GPF 224.

  In the present embodiment, the flow passage cross-sectional area of the communication pipe 226 is smaller than that of the upstream exhaust pipe 140 a and the filter housing portion 222. Thereby, the amount of oxygen guided to the reservoir 228 through the communication pipe 226 can be suppressed. Therefore, it is possible to avoid a situation in which the particulate matter burns rapidly in the reservoir 228. For this reason, the thermal damage of GPF224 can be reduced.

The vibration applying unit 250 vibrates the GPF 224. FIG. 5 is a diagram illustrating the vibration applying unit 250. FIG. 5A is a diagram illustrating the vibration applying unit 250 of the present embodiment, and FIGS. 5B and 5C are diagrams illustrating the vibration applying units 260 and 270 of the modified example. .
In addition, in FIG. 5, a vehicle body is shown with a dashed-dotted line.

  As shown to Fig.5 (a), the vibration provision part 250 connects a vehicle body and the downstream exhaust pipe 140b. The vibration applying unit 250 includes a main body unit 252, an elastic unit 254, and a moving unit 256. The main body 252 has a cylindrical shape, and one end (upper end) is connected to the vehicle body. An opening 252 a is formed at the other end (lower end) of the main body 252. The main body 252 is provided with a partition plate 252b that divides the internal space into two in the vertical direction. The elastic part 254 is configured by a spring. The elastic part 254 is provided between the opening 252a and the partition plate 252b in the internal space of the main body part 252.

  The moving portion 256 includes a rod portion 256a, a locking portion 256b, and a connecting portion 256c. The bar portion 256a is a bar member. The locking portion 256b is provided at one end (upper end) of the rod portion 256a. The locking portion 256 b has a larger diameter than the opening 252 a of the main body portion 252. The locking portion 256 b is provided between the opening 252 a and the elastic portion 254 in the internal space of the main body portion 252. The locking portion 256b is urged vertically downward by the elastic portion 254. The connecting portion 256c is provided at the other end (lower end) of the rod portion 256a and is connected to the downstream exhaust pipe 140b.

  Therefore, if the vehicle body moves in a direction approaching the downstream exhaust pipe 140b while the vehicle is traveling due to vibration of the vehicle body, the elastic portion 254 is contracted by the partition plate 252b. When the downstream exhaust pipe 140b moves away from the vehicle body from this state, the elastic portion 254 extends by the partition plate 252b, and the locking portion 256b collides with the lower end of the main body portion 252. That is, the downward movement of the connecting portion 256c is restricted. Thereby, vibration is generated, and the vibration is applied to the GPF 224 through the downstream exhaust pipe 140b and the filter housing portion 222.

  Therefore, when the exhaust gas does not pass through the GPF 224, for example, when the vehicle is running and the engine is stopped, or when the hybrid vehicle is running with only the motor, vibration is applied to the GPF 224, and the GPF 224 It is possible to efficiently drop the particulate matter.

  In addition, the vibration applying unit 260 of the modification includes a main body unit 262, an elastic unit 264, and a moving unit 256. The main body 262 has a cylindrical shape, and one end (upper end) is connected to the vehicle body. An opening 262 a is formed at the other end (lower end) of the main body 262. The elastic portion 264 is made of rubber or elastomer. The elastic part 264 is provided in the internal space of the main body part 262. One end (upper end) of the elastic portion 264 is connected to the vehicle body by a connecting rod 262b. The other end (lower end) of the elastic part 264 is connected to the locking part 256 b of the moving part 256.

  Thus, also in the vibration applying unit 260 of the modification, it is possible to apply vibration to the GPF 224.

  Further, the vibration applying unit 270 of the modification includes a main body unit 272, a first elastic unit 274, a second elastic unit 276, and a moving unit 256. The main body 272 has a flat plate shape, and two holes 272a and 272b are formed. The holes 272a and 272b are spaced apart in the vertical direction, and the hole 272b is located below the hole 272a.

  The first elastic part 274 and the second elastic part 276 are made of rubber or elastomer. The first elastic portion 274 has a lower elastic modulus (softer) than the second elastic portion 276. The 1st elastic part 274 is provided in the upper part of hole 272a, 272b. The first elastic portion 274 provided in the hole 272a is connected to the vehicle body by a connecting rod 272c. The second elastic portion 276 is provided below the holes 272a and 272b. The second elastic portion 276 provided in the hole 272b is connected to one end (upper end) of the moving portion 256.

  As described above, the vibration applying unit 270 according to the modified example can attenuate the force in the upward direction and transmit the force in the downward direction, and can apply vibration to the GPF 224.

  As described above, the exhaust gas purifying apparatus 200 according to the present embodiment provides thermal damage to the GPF 224 by providing the storage unit 228 for storing the particulate matter at a position retracted from vertically below (below) the GPF 224. Can be reduced.

(Modification of groove)
6A and 6B are diagrams for explaining a modification of the groove portion 440. FIG. 6A is a top view of the bottom surface 230, and FIG. 6B is a cross-sectional view taken along the line VIb in FIG. is there. In FIG. 6, the GPF 224 is indicated by a broken line for easy understanding.

  As shown in FIG. 6B, a top portion 440ab extending from the upstream exhaust pipe 140a toward the communication pipe 226 is formed on the bottom surface 230. The bottom surface 230 is inclined vertically upward from the side surface 230a of the filter housing portion 222 toward the top portion 440ab. Accordingly, first grooves 440a extending from the upstream exhaust pipe 140a toward the communication pipe 226 are formed at both ends of the bottom surface 230. That is, the first groove portion 440a is formed along the side surface 230a of the filter housing portion 222.

  Thereby, as shown by the solid line arrow in FIG. 6B, the particulate matter that has fallen off from the GPF 224 and dropped onto the bottom surface 230 is guided to the first groove portion 440a. Therefore, also in the groove portion 440 of the modified example, the particulate matter can be prevented from staying in a portion where the exhaust gas flow rate is large (a region surrounded by a one-dot chain line in FIG. 6B).

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  In the above embodiment, the GPF 224 has been described by taking a wall flow type filter as an example. However, the configuration of the GPF 224 is not limited as long as the particulate matter can be captured.

  In the above-described embodiment, the configuration in which the GPF 224 includes a catalyst has been described as an example. However, the GPF 224 may capture the particulate matter and may not include the catalyst.

  Moreover, in the said embodiment, the flow path cross-sectional area of the communication pipe 226 demonstrated and demonstrated the structure smaller than the exhaust pipe 140 as an example. However, the channel cross-sectional area of the communication pipe 226 is not limited. The cross-sectional area of the communication pipe 226 may be equal to or larger than the cross-sectional area of the exhaust pipe 140 and the filter housing portion 222.

  Moreover, in the said embodiment and modification, it demonstrated taking the case of the structure in which the groove parts 240 and 440 are formed in multiple numbers. However, the number of grooves 240 and 440 is not limited and may be one.

  Moreover, in the said embodiment and modification, the exhaust-gas purification apparatus 200 demonstrated and demonstrated the structure provided with the vibration provision parts 250, 260, 270 as an example. However, the vibration applying units 250, 260, and 270 are not essential components.

  Further, in the above embodiment, the communication part 222b between the filter housing part 222 and the downstream exhaust pipe 140b is located on the vehicle body side, and the communication part 222a between the upstream exhaust pipe 140a and the filter housing part 222 is more than the communication part 222b. The case where it is separated from the vehicle body has been described as an example. However, the communication location 222b may be further away from the vehicle body than the communication location 222a. Further, the communication location 222a and the communication location 222b may be at the same position (the same distance from the vehicle body), that is, the upstream exhaust pipe 140a and the downstream exhaust pipe 140b may be coaxial.

  Moreover, in the said embodiment, the gasoline engine was mentioned as an example and demonstrated as the engine 120. FIG. However, the exhaust gas purification apparatus 200 is not limited to the type of engine (for example, a diesel engine), and can remove particulate matter contained in the exhaust gas exhausted from the engine.

  The present invention can be used for an exhaust gas purification device.

140a Upstream exhaust pipe 140b Downstream exhaust pipe 200 Exhaust gas purification device 222 Filter housing (exhaust pipe)
230 Bottom (falling part)
224 GPF (filter)
226 Communication pipe 228 Reserving part 240, 440 Groove part 250, 260, 270 Vibration applying part

Claims (4)

A filter provided in an exhaust pipe through which exhaust gas exhausted from the engine passes, and traps particulate matter contained in the exhaust gas;
A drop part provided on the upstream side of the filter, in which the particulate matter captured by the filter falls;
A storage part that contacts the exhaust pipe and stores the particulate matter introduced from the dropping part;
A communication pipe communicating the drop part and the storage part;
An exhaust gas purification apparatus comprising:   The exhaust gas purification device according to claim 1, wherein a cross-sectional area of the communication pipe is smaller than the exhaust pipe.   The exhaust gas purification device according to claim 1 or 2, wherein the dropping portion is formed with one or a plurality of grooves.   The exhaust gas purification apparatus according to any one of claims 1 to 3, further comprising a vibration applying unit that vibrates the filter.

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