JP7067990B2 - Exhaust gas purification device - Google Patents

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 the exhaust gas exhausted from the engine. Such filters will become clogged with particulate matter as they continue to be used. Therefore, a regeneration process is performed in which the captured soot is burned and removed from the filter by raising the temperature of the filter.

Further, a technique has been developed in which the particulate matter captured by the filter is dropped by its own weight by inclining the filter upward from the upstream side to the downstream side (for example, Patent Document 1). In the technique of Patent Document 1, an accommodating portion is provided vertically below (directly below) the upstream opening of the filter, and the particulate matter dropped from the filter is accommodating in the accommodating portion.

Japanese Unexamined Patent Publication No. 10-159540

In the technique of Patent Document 1, since the filter is arranged directly above the accommodating portion, soot contained in the accommodating portion may be burned during the regeneration process, which may cause thermal damage to the filter.

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

In order to solve the above problems, the exhaust gas purification device of the present invention is provided in an exhaust pipe through which the exhaust gas exhausted from the engine passes, and has a filter for capturing particulate matter contained in the exhaust gas and an upstream of the filter. It is provided on the side and is provided at the drop part where the particulate matter captured by the filter falls and the position where it is retracted from directly under the filter, and it comes into contact with the exhaust pipe and stores the particulate matter introduced from the drop part. It includes a storage unit, a communication pipe that connects the drop unit and the storage unit, and a filter and a regeneration processing execution unit that supplies oxygen to the storage unit .

Further, the cross-sectional area of the flow path 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 falling portion.

Further, a vibration applying portion that vibrates the filter may be provided.

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

It is a schematic diagram which shows the structure of an engine system. It is a schematic diagram which shows the structure of the exhaust gas purification apparatus. It is a figure explaining GPF. It is a figure explaining the bottom surface of the filter accommodating part. It is a figure explaining the vibration addition part. It is a figure explaining the deformation example of the groove portion.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, etc. shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate explanations, and elements not directly related to the present invention are not shown. do.

FIG. 1 is a schematic view showing the configuration of the engine system 100. In FIG. 1, the signal flow is indicated by a broken line arrow. As shown in FIG. 1, the engine system 100 is provided with an ECU (Engine Control Unit) 110 which is a microcomputer including a central processing unit (CPU), a ROM in which a program or the like is stored, a RAM as a work area, and the like. , The entire engine 120 is collectively controlled by the ECU 110. However, in the following, the configurations and processes related to the present embodiment will be described in detail, and the description of the configurations and processes unrelated to the present embodiment will be omitted. Further, 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 the intake manifold 126 is communicated with the intake port 124 of each cylinder 122a formed in the cylinder block 122. An intake pipe 130 is communicated with the gathering portion of the intake manifold 126 via the 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.

Further, the exhaust manifold 138 is communicated with the exhaust port 136 of each cylinder 122a formed in the cylinder block 122 of the engine 120. The muffler 142 is communicated with the collecting portion of the exhaust manifold 138 via the exhaust pipe 140. The exhaust pipe 140 is provided with an exhaust gas purifying device 200, which will be 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 device 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 cylinder 122a so that its tip is located in the combustion chamber 146. Further, 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 the amount of intake air flowing into the engine 120 between the air cleaner 132 and the throttle valve 134 in the intake pipe 130, and an air (outside air) flowing into the engine 120. An intake air temperature sensor 162 that detects the temperature is provided. Further, the engine system 100 is provided with a throttle opening sensor 164 for detecting the opening degree of the throttle valve 134. Further, the engine system 100 is provided with a crank angle sensor 166 for detecting the crank angle of the crankshaft and an accelerator opening sensor 168 for detecting the opening degree of the accelerator (not shown).

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

The ECU 110 controls the engine 120 by acquiring the signals output from the sensors 160 to 168. 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 degree determination unit 188, the ignition timing determination unit 190, and the drive control unit 192. Functions as.

The signal acquisition unit 180 acquires a signal indicating a value detected by each sensor 160 to 168. The target value derivation 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 derivation unit 182 refers to the target torque and the target engine rotation speed with reference to the map stored in advance based on the derived engine rotation speed and the signal indicating the accelerator opening degree acquired from the accelerator opening sensor 168. Is derived.

The air amount determination unit 184 determines the 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 derivation unit 182. The throttle opening degree determining unit 188 derives the total amount of the target air amount of each cylinder 122a determined by the air amount determining unit 184, and determines the target throttle opening degree for sucking the total amount of air from the outside.

The injection amount determination unit 186 supplies to each cylinder 122a based on the target engine speed and target torque derived by the target value derivation unit 182, the target air amount of each cylinder 122a determined by the air amount determination unit 184, and the like. Determine the target injection amount of fuel to be used. 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 determined target injection amount of fuel from the injector 150 in the intake stroke or the compression stroke of the engine 120. , The target injection timing and the target injection period of each injector 150 are determined.

The ignition timing determination unit 190 has a spark plug 148 in each cylinder 122a based on the target engine speed and torque derived by the target value derivation unit 182, a signal indicating the crank angle detected by the crank angle sensor 166, and the like. Determine the target ignition timing.

The drive control unit 192 drives a throttle valve actuator (not shown) so that the throttle valve 134 opens at the target throttle opening degree determined by the throttle opening degree 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 to inject the fuel of the target injection amount from the injector 150. 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 way, the exhaust gas generated by the combustion of the fuel in the combustion chamber 146 is discharged to the outside through the exhaust pipe 140. Exhaust gas contains particulate matter such as hydrocarbons (HC: Hydro Carbon), carbon monoxide (CO), nitrogen oxides (NOx), and soot, so it is necessary to remove them. Therefore, an exhaust gas purifying device 200 is provided in the exhaust pipe 140, and the exhaust gas purifying device 200 removes hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter.

(Exhaust gas purification device 200)
FIG. 2 is a schematic view showing the configuration of the exhaust gas purification device 200. In FIG. 2, the body of the vehicle on which the engine 120 is mounted is shown by a alternate long and short dash line. As shown in FIG. 2, the exhaust gas purifying device 200 includes a three-way catalyst 210, a filter unit 220, and a vibration imparting unit 250. In the present embodiment, the exhaust gas purifying 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 contains, for example, catalyst components such as platinum (Pt), palladium (Pd), and rhodium (Rh). 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 accommodating portion 222 (exhaust pipe), a GPF (filter) 224, a communication pipe 226, and a storage portion 228. The filter accommodating portion 222 connects the upstream exhaust pipe 140a and the downstream exhaust pipe 140b. The upstream exhaust pipe 140a and the filter accommodating portion 222 are connected so that their communication points 222a are separated from the vehicle body from the center of the flow path cross section of the filter accommodating portion 222. Further, the filter accommodating portion 222 and the downstream exhaust pipe 140b are connected so that their communication points 222b are on the vehicle body side from the center of the flow path cross section of the filter accommodating 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 flow path cross section is orthogonal to the vertical direction (extending direction of the upstream exhaust pipe 140a). Direction).

The GPF 224 is provided in the filter accommodating 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 illustrating GPF 224. FIG. 3A is a perspective view of the GPF 224. FIG. 3B is a front view of the GPF 224. FIG. 3 (c) is an XZ cross-sectional view of GPF 224. In FIG. 3A, the flow of exhaust gas is indicated by a white arrow, and in FIG. 3C, the flow of exhaust gas is indicated by a solid arrow. Further, in FIG. 3 of the present embodiment, vertically intersecting X-axis, Y-axis, and Z-axis (exhaust gas flow direction) are defined as shown in the figure. Further, in FIGS. 3 (a) to 3 (c), in order to facilitate understanding, the cell 316 is shown larger than the outer cylinder 312.

As shown in FIGS. 3 (a) to 3 (c), 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, for example, ceramic.

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

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

As shown in FIG. 3C, the upstream plug portion 320 seals the upstream opening 318a on the upstream side of the cell 316A 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 into the second cell group) other than the cell 316A. The downstream plug portion 330 is made of, for example, ceramic.

Further, in the present embodiment, the GPF 224 has a function of capturing particulate matter, a function as a three-way catalyst for purifying exhaust gas, and a function as OSC (Oxygen Storage capacity). Specifically, the catalyst component and the OSC material constituting the three-way catalyst are supported on the filter wall 314 constituting the GPF 224.

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

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

Further, in the present embodiment, the GPF 224 is provided in the filter accommodating portion 222 so that the axial direction of the upstream exhaust pipe 140a and the downstream exhaust pipe 140b intersects with the axial direction of the outer cylinder 312. For example, the GPF 224 has a filter accommodating portion 222 so that the axial direction of the outer cylinder 312 is the vertical direction, or the axial direction of the outer cylinder 312 exceeds 0 degrees and is tilted by less than 45 degrees from the vertical direction to the downstream side. It is provided inside. That is, the upstream opening 318a is provided facing the bottom surface (falling portion) 230 of the filter accommodating 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 will fall to the bottom surface 230 by its own weight. As shown in FIG. 2, the bottom surface 230 is inclined vertically downward from the upstream exhaust pipe 140a toward the communication pipe 226.

4A and 4B are views for explaining the bottom surface 230 of the filter accommodating portion 222, FIG. 4A shows a top view of the bottom surface 230, and FIG. 4B is a sectional view taken along line IVb of FIG. 4A. It is a figure. In FIG. 4, the GPF 224 is shown by a broken line for ease of understanding.

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

Further, as shown in FIG. 4B, the bottom surface 230 is inclined downward from the side surface 230a of the filter accommodating portion 222 toward the first groove portion 240a. Further, a top portion 240ab is formed between the adjacent first groove portions 240a, and the bottom surface 230 is inclined vertically downward from the top portion 240ab toward the first groove portion 240a.

Therefore, as shown by the solid arrow in FIG. 4B, the particulate matter that has fallen off from the GPF 224 and has fallen to the bottom surface 230 is guided to the first groove portion 240a. Therefore, it is possible to suppress the retention of the particulate matter in the place where the flow velocity of the exhaust gas is large (the region surrounded by the alternate long and short dash line in FIG. 4B). As a result, the amount of particulate matter that is blown 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 vertically downward from the upstream exhaust pipe 140a toward the communication pipe 226. That is, the first groove portion 240a is inclined vertically downward 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 accommodating unit 222 to the communication pipe 226 (reservoir unit 228).

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

Specifically, as shown in FIG. 2, the storage unit 228 is in contact with the downstream exhaust pipe 140b. Therefore, heat exchange is performed between the storage unit 228 and the downstream exhaust pipe 140b, and the storage unit 228 rises to the regeneration temperature. Further, oxygen diffuses from the filter accommodating portion 222 to the accommodating portion 228 due to the difference (difference in oxygen partial pressure) between the oxygen concentration in the storage portion 228 and the oxygen concentration in the filter accommodating portion 222 (upstream exhaust pipe 140a). .. That is, the oxygen concentration in the storage unit 228 is lower than that in the filter storage unit 222. Therefore, oxygen is diffused from the filter accommodating portion 222 to the accommodating portion 228. As a result, the particulate matter stored in the storage unit 228 will be burned.

In this way, by providing the storage unit 228 at a position retracted from vertically below (directly below) the GPF 224, the heat (flame) generated by the combustion of the particulate matter in the storage unit 228 is directly transferred to the GPF 224. You can avoid the situation. Therefore, it is possible to reduce the thermal damage of the GPF 224.

Further, in the present embodiment, the flow path cross-sectional area of the communication pipe 226 is smaller than that of the upstream exhaust pipe 140a and the filter accommodating portion 222. As a result, the amount of oxygen introduced 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 is rapidly burned in the storage unit 228. Therefore, the thermal damage of GPF 224 can be reduced.

The vibration applying unit 250 vibrates the GPF 224. FIG. 5 is a diagram illustrating a vibration applying portion 250. FIG. 5A is a diagram for explaining the vibration applying portion 250 of the present embodiment, and FIGS. 5B and 5C are diagrams for explaining the vibration applying portion 260 and 270 of the modified example. ..
In FIG. 5, the vehicle body is shown by a alternate long and short dash line.

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

The moving portion 256 includes a rod portion 256a, a locking portion 256b, and a connecting portion 256c. The rod portion 256a is a rod member. The locking portion 256b is provided at one end (upper end) of the rod portion 256a. The locking portion 256b has a larger diameter than the opening 252a of the main body portion 252. The locking portion 256b is provided between the opening 252a 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, when the vehicle body moves in a direction close to the downstream exhaust pipe 140b while the vehicle is traveling due to vibration of the vehicle body or the like, the elastic portion 254 is reduced by the partition plate 252b. When the downstream exhaust pipe 140b moves away from the vehicle body from this state, the elastic portion 254 is extended 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. As a result, vibration is generated, and the vibration is applied to the GPF 224 through the downstream exhaust pipe 140b and the filter accommodating 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 only with the motor, vibration is applied to the GPF 224, and the GPF 224 is subjected to vibration. It is possible to efficiently drop particulate matter from.

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

In this way, vibration can be applied to the GPF 224 even in the vibration applying unit 260 of the modified example.

Further, the vibration applying portion 270 of the modified example includes a main body portion 272, a first elastic portion 274, a second elastic portion 276, and a moving portion 256. The main body portion 272 has a flat plate shape, and two holes 272a and 272b are formed. The holes 272a and 272b are vertically separated, and the hole 272b is located below the hole 272a.

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

In this way, the vibration applying portion 270 of the modified example can attenuate the upward force and transmit the downward force, and can apply vibration to the GPF 224.

As described above, in the exhaust gas purification device 200 according to the present embodiment, the storage unit 228 for storing the particulate matter is provided at a position retracted from vertically below (directly below) the GPF 224, thereby causing thermal damage to the GPF 224. Can be reduced.

(Deformation example of groove)
6A and 6B are views for explaining a modified example of the groove portion 440, FIG. 6A is a top view of the bottom surface 230, and FIG. 6B is a sectional view taken along line VIb of FIG. 6A. be. In FIG. 6, the GPF 224 is shown by a broken line for ease of 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 accommodating portion 222 toward the top portion 440ab. Therefore, first groove portions 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 accommodating portion 222.

As a result, as shown by the solid arrow in FIG. 6B, the particulate matter that has fallen off from the GPF 224 and has fallen to the bottom surface 230 is guided to the first groove portion 440a. Therefore, even in the groove portion 440 of the modified example, it is possible to suppress the retention of the particulate matter in the portion where the flow velocity of the exhaust gas is large (the region surrounded by the alternate long and short dash line in FIG. 6 (b)).

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present invention. Will be done.

In the above embodiment, a wall flow type filter as GPF 224 has been described as an example. However, the GPF 224 is not limited in composition as long as it can capture particulate matter.

Further, in the above embodiment, the configuration in which the GPF 224 contains a catalyst has been described as an example, but the GPF 224 may not contain a catalyst as long as it can capture particulate matter.

Further, in the above embodiment, the configuration in which the flow path cross-sectional area of the communication pipe 226 is smaller than that of the exhaust pipe 140 has been described as an example. However, the cross-sectional area of the communication pipe 226 is not limited. The cross-sectional area of the flow path of the communication pipe 226 may be equal to or larger than the cross-sectional area of the flow path of the exhaust pipe 140 or the filter accommodating portion 222.

Further, in the above-described embodiment and modification, a configuration in which a plurality of groove portions 240 and 440 are formed will be described as an example. However, the number of groove portions 240 and 440 is not limited, and may be one.

Further, in the above-described embodiment and modified example, the configuration in which the exhaust gas purifying device 200 includes the vibration imparting portions 250, 260, and 270 has been described as an example. However, the vibration applying portions 250, 260 and 270 are not indispensable configurations.

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

Further, in the above embodiment, a gasoline engine as an example of the engine 120 has been described. However, the exhaust gas purifying device 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 Storage section 240, 440 Groove section 250, 260, 270 Vibration applying section

Claims (4)

A filter provided in the exhaust pipe through which the exhaust gas exhausted from the engine passes, and a filter that captures particulate matter contained in the exhaust gas,
A drop portion provided on the upstream side of the filter and where the particulate matter captured by the filter falls,
A storage unit provided at a position retracted from directly below the filter, which comes into contact with the exhaust pipe and stores the particulate matter introduced from the drop portion, and a storage unit.
A communication pipe that communicates the drop portion and the storage portion,
A regeneration processing execution unit that supplies oxygen to the filter and the storage unit,
Exhaust gas purification device equipped with. The exhaust gas purification device according to claim 1, wherein the flow path cross section of the communication pipe is smaller than that of the exhaust pipe. The exhaust gas purification device according to claim 1 or 2, wherein one or a plurality of grooves are formed in the falling portion. The exhaust gas purification device according to any one of claims 1 to 3, further comprising a vibration applying portion that vibrates the filter.

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