Exhaust device for an engine and method for detecting a pressure drop in a particulate filter

Abstract

Exhaust system for an engine, comprising: a particulate filter (GPF 3) which is provided or can be mounted on an exhaust or outlet path of the engine and comprises a filter body (33) for capturing a particulate material contained in the exhaust gas which is discharged from the engine, and a tubular filter casing (35) which accommodates the filter body (33); and a differential pressure detector (8) to detect a pressure difference between the exhaust gas located on an upstream side in an exhaust gas flow direction of the filter body (33) and the exhaust gas located on a downstream side in the exhaust gas flow direction of the filter body (33), wherein the differential pressure detector (8) comprises an upstream exhaust gas extraction section (81) which extracts the exhaust gas which is positioned on the upstream side in the exhaust gas flow direction of the filter body (33), a downstream exhaust gas extraction section (82) which extracts the exhaust gas which is positioned on the downstream side in the exhaust gas flow direction of the filter body (33), and a differential pressure detection section (83) to detect the pressure difference of the exhaust gas which is extracted through the upstream exhaust gas extraction section (81) and the downstream exhaust gas extraction section (82), an exhaust gas discharge opening (71) and an EGR gas extraction opening (70) are provided at a downstream end section of the tubular filter casing (35) such that a center of the EGR gas extraction opening (70) is located on the opposite side of the exhaust gas discharge opening (71) with respect to a central axis (L3) of the tubular filter casing (35), and the downstream exhaust gas extraction section (82) of the differential pressure detector (83) is provided between the exhaust gas discharge opening (71) and the EGR gas extraction opening (70) at the downstream end section of the filter casing (35).

Description

[0001] The present invention relates to an exhaust system for an engine. Furthermore, the invention relates to a method for detecting a pressure drop in a particle filter in order to determine whether regeneration is necessary.

[0002] Conventionally, a particulate filter is provided for cleaning particulate material contained in an exhaust gas on an upstream side in an exhaust or discharge path of a motor vehicle engine, such as a diesel engine or a gasoline engine.

[0003] The particulate materials contained in the exhaust gas are trapped at a partition wall of the particulate filter and then removed by combustion when a certain amount of particulate material has accumulated.

[0004] It is known that the amount of particulate material collected is determined by detecting a difference between an exhaust gas pressure located on an upstream side of the particulate filter and another exhaust gas pressure located on a downstream side of the particulate filter (an exhaust gas pressure difference) (see, for example, JP 2005 - 256 805 A).

[0005] While both the exhaust gas positioned on the upstream side of the particulate filter and the exhaust gas positioned on the downstream side of the particulate filter are used to detect the pressure difference described above, there are concerns that the accuracy of the detected pressure difference may be degraded by being adversely or unsuitably influenced by the exhaust gas flow in the exhaust or outlet path according to the structure of the exhaust or exhaust device.

[0006] EP 1 845 244 A2 discloses an exhaust gas purification system of an internal combustion engine with an exhaust gas throttle valve that opens when the exhaust gas purification device is broken.

[0007] JP 2011 / 117 409 A discloses an exhaust gas treatment device with a catalyst in a honeycomb structure and a honeycomb filter.

[0008] DE 103 26 530 A1 describes an exhaust gas purification device for an internal combustion engine with a recovery schedule for a diesel particulate filter.

[0009] Accordingly, one of the aims or subjects of the present invention is to improve the detection accuracy of the pressure difference by suppressing an adverse or unsuitable influence of the exhaust gas flow.

[0010] This subject matter is solved by the features of the independent claims. Preferred embodiments of the present invention are the subject of the other dependent claims.

[0011] The present invention is an exhaust system for an engine, comprising a particle filter, which is provided or mountable on an exhaust or outlet path of the engine, a filter body for capturing particulate material contained in the exhaust gas discharged from the engine, a filter casing for housing the filter body, and a differential pressure detector for detecting a pressure difference between the exhaust gas positioned on a downstream side in the exhaust gas flow direction of the filter body and the exhaust gas positioned on a downstream side in the exhaust gas flow direction of the filter body, wherein the differential pressure detector includes an upstream exhaust gas extraction section that extracts the exhaust gas positioned on the upstream side in the exhaust gas flow direction of the filter body.a downstream exhaust gas extraction section, which extracts the exhaust gas that is positioned on the downstream side in the exhaust gas flow direction of the filter body, and a pressure difference detection section to detect the pressure difference of the exhaust gas that is extracted through the upstream exhaust gas extraction section and the downstream exhaust gas extraction section, an exhaust gas discharge opening and an EGR gas extraction opening are provided at a downstream end section of the tubular filter jacket or filter housing such that a center of the EGR gas extraction opening is provided on the opposite side of the exhaust gas discharge opening with respect to a central axis of the tubular filter jacket,and the downstream exhaust gas extraction section of the differential pressure detector is provided between the exhaust gas discharge opening and the EGR gas extraction opening at the downstream end section of the filter casing.

[0012] According to the present invention, since the downstream exhaust gas sampling port is provided between the exhaust gas discharge port and the EGR gas sampling port, the exhaust gas for differential pressure detection, which is taken from each of the exhaust gas sampling ports, is not significantly influenced by the dynamic pressure of the exhaust gas flow directed towards the exhaust gas discharge port and the EGR gas sampling port. Accordingly, the accuracy of the differential pressure detection can be properly improved.

[0013] In one embodiment of the present invention, the exhaust device further comprises an L-shaped exhaust pipe, which is connected to an upstream side in the exhaust flow direction of the filter casing and is configured to be bent in an L-shape, wherein a stepped section, which is recessed or offset outwards, is provided on a section of a side wall at the outer circumference of the L-shaped bend of the L-shaped exhaust pipe, which is spaced remotely on one side of the filter body from an L-shaped bend section of the L-shaped exhaust pipe, and the upstream exhaust gas extraction section of the differential pressure detector is provided on the stepped section of the L-shaped exhaust pipe.

[0014] According to this embodiment, as the exhaust gas flows along the side wall at the outer circumference of the L-shaped bend in the L-shaped exhaust pipe, the flow of the exhaust gas becomes mild (calm) at a position near the outwardly recessed or stepped section of the side wall at the outer circumference. Thus, since the upstream exhaust gas extraction section is located at the stepped section where the exhaust gas flow becomes mild (calm), the exhaust gas for pressure differential detection, which is extracted from each exhaust gas extraction port, is not strongly influenced by the dynamic pressure of the exhaust gas flow.

[0015] In another embodiment of the present invention, a catalyst for cleaning the exhaust gas is connected to an upstream section of the L-shaped exhaust pipe, and a downstream section of the catalyst is configured to overlap a section of an upstream end face of the filter body when viewed in an axial direction of the particulate filter.

[0016] According to this embodiment, since the distance between an upstream end of the catalyst and a downstream end of the particle filter can be shortened, the exhaust device can be correspondingly compact, and the exhaust gas can also be caused to flow into the particle filter in a state where the temperature of the exhaust gas does not decrease very much, so that regeneration of the filter (removal of particulate material (PM) by combustion) can be properly achieved or maintained.

[0017] In another embodiment of the present invention, the particulate filter is arranged laterally such that the exhaust gas passes through the particle filter in a lateral direction, an L-shaped exhaust pipe is provided which is connected to an upstream side in the exhaust gas flow direction of the filter casing and is configured to be bent into an L-shape, the upstream exhaust gas extraction section and the downstream exhaust gas extraction section of the differential pressure detector are each provided on a lower section of the L-shaped exhaust pipe and a lower section of the downstream end section of the filter casing, and the differential pressure detection section of the differential pressure detector is provided around an upper side of the particulate filter.

[0018] According to this embodiment, the machinability or manufacturability of the differential pressure detection section can be improved by providing the differential pressure detection section at a position around the upper side of the particle filter.

[0019] In another embodiment of the present invention, the exhaust device further comprises an EGR gas extraction pipe, which is connected to the EGR gas extraction port and is provided to pass alongside the particulate filter, corresponding to one side of the outer circumference of the L-shaped bend of the L-shaped exhaust pipe; an EGR pipe support member, which is provided alongside the particulate filter and supports the EGR gas extraction pipe; an upstream exhaust extraction pipe, which connects the upstream exhaust extraction section and the pressure differential detection section; and an extraction pipe support member, which is fixed to the EGR gas extraction pipe and supports the upstream exhaust extraction pipe.

[0020] According to this embodiment, the upstream exhaust gas extraction pipe is supported by the EGR pipe support element via the extraction pipe support element and the EGR gas extraction pipe. By using this EGR gas extraction pipe as a support structure for the upstream exhaust gas extraction pipe, the exhaust system can be made more compact and its layout can be improved.

[0021] According to another aspect, a method for detecting a pressure drop (a pressure difference between an upstream side and a downstream side) of a particle filter is provided, comprising the steps of: Providing an upstream exhaust gas extraction section that extracts the exhaust gas which is positioned on the upstream side in the exhaust gas flow direction of a filter body of the particulate filter, Providing a downstream exhaust gas extraction section that extracts the exhaust gas which is positioned on the downstream side in the exhaust gas flow direction of the filter body, Providing a differential pressure detection section to detect the pressure difference of the exhaust gas drawn through the upstream exhaust gas extraction section and the downstream exhaust gas extraction section, Providing an exhaust gas discharge port and an EGR gas extraction port at a downstream end section of a tubular filter jacket such that a center of the EGR gas extraction port is located on the opposite side of the exhaust gas discharge port with respect to a central axis of the tubular filter jacket, and Arranging the downstream exhaust gas extraction section between an exhaust gas discharge opening and an EGR gas extraction opening at the downstream end section of the filter body.

[0022] Preferably, the method further comprises the steps of: Connecting an L-shaped exhaust pipe to an upstream side in the exhaust flow direction of a filter casing of the filter body, Providing a stepped section which is recessed or set off outwards on a section of a side wall on an outer circumference of an L-shaped bend of the L-shaped exhaust pipe, which is spaced remotely on one side of the filter body from the L-shaped bend section of the L-shaped exhaust pipe, and Provision of the upstream exhaust gas extraction section at the stage section of the L-shaped exhaust pipe.

[0023] Furthermore, the procedure preferably includes the steps of: Connecting a catalyst for cleaning the exhaust gas to an upstream section of the L-shaped exhaust pipe, and Forming a downstream section of the catalyst such that it overlaps a section of an upstream end surface of the filter body when viewed or considered in an axial direction of the particle filter.

[0024] Other features, aspects and advantages of the present invention will become apparent from the following descriptions, which refer to the accompanying drawings. Fig. Figure 1 is a side view which schematically shows a state where an exhaust gas cleaning device according to a first embodiment is installed on an engine. Fig. Figure 2 is a schematic top view of Fig. 1. Fig. Figure 3 is a side view showing the exhaust gas cleaning device of Fig. 1 shows. Fig. Figure 4 is a perspective view of the exhaust gas cleaning device of Fig. 3, when viewed from an upper left rear side. Fig. Figure 5 is a perspective view of the exhaust gas cleaning device of Fig. 3, when viewed from a left, forward-facing side. Fig. 6 is a sectional view taken along a line VI-VI from Fig. 3. Fig. 7 is a sectional view taken along a line VII-VII of Fig. 2. Fig. Figure 8 is a perspective view of a connecting or linking pipe, as seen from an upper left, forward-facing side. Fig. Figure 9 is a view of a GPF connection end section connecting pipe when viewed from a forward-facing side. Fig. Figure 10 is a perspective view of a pressure difference detector when viewed from the upper left, backward-facing side. Fig. Figure 11 is a perspective view of the pressure difference detector when viewed from a lower right, backward-facing side. Fig. Figure 12 is a sectional view of a differential pressure sensor.

[0025] Embodiments of the present invention will be described in detail below with reference to the drawings. The following descriptions of preferred embodiments are essentially exemplary representations of the present invention and are not intended to limit or restrict any applications or uses of the present invention. VERSION 1< Motor >

[0026] An engine to which an exhaust or exhaust device 1 according to a first embodiment is applied is an inline four-cylinder gasoline engine (inline multi-cylinder engine) installed on a motor vehicle. The engine is arranged laterally on a front section of a front-engine, front-wheel-drive (FF) vehicle.

[0027] The present invention is applicable not only to this four-cylinder gasoline engine, but also to any other multi-cylinder engine or a diesel engine. Furthermore, the present exhaust device 1 is applicable not only to the FF vehicle, but also to any vehicle of a different layout type, such as a rear-engine, rear-wheel-drive (RR) vehicle or a four-wheel-drive (4WD) vehicle, including a motorcycle.

[0028] The engine has an engine body E, which comprises a cylinder block E1 and a cylinder head E2, as shown in Fig. Figure 1 shows that, while detailed illustrations are omitted here, the first through fourth cylinders, formed by the cylinder block E1 and the cylinder head E2, are arranged vertically in a row on a paper surface. A combustion chamber for each cylinder is formed by a cylinder bore (not illustrated) of the cylinder block E1, a piston (not illustrated) located inside the cylinder bore, and the cylinder head E2.

[0029] Four exhaust ports (not illustrated), each connected to one of the four combustion chambers, are formed on the cylinder head E2. Exhaust gas generated inside the combustion chambers is discharged to the outside environment of the vehicle through an exhaust path containing these ports. < Exhaust path >

[0030] As this is in Fig. 1 and Fig. As shown in Figure 2, the exhaust device 1 according to the present embodiment is connected to the exhaust ports described above, and a downstream exhaust system (not illustrated), which connects to the vehicle's external environment, is connected to a downstream side of the exhaust device 1. Thus, an exhaust path of the engine comprises the exhaust ports described above, the exhaust device 1, and the downstream exhaust system. < Exhaust system >

[0031] The outlet or exhaust device 1 according to the present embodiment comprises, as shown in Fig. 1 and Fig. Figure 2 shows an exhaust manifold M, which is connected to the four exhaust ports of the engine body E, and an exhaust cleaning device Q, which is connected to an outlet M7 at the downstream end of the exhaust manifold M via a connecting section N. < Exhaust manifold and connecting section >

[0032] The exhaust gas, which is expelled from the engine's four combustion chambers through the exhaust ports, is fed from the exhaust manifold M to the exhaust gas cleaning device Q via the connecting section N. As shown in Fig. 2 and Fig. As shown in Figure 4, independent exhaust pipes are connected to the four exhaust ports, and a collector pipe is arranged at one end in a cylinder bank direction. This collector pipe, to which the four independent exhaust pipes are connected, extends essentially downwards.

[0033] The connecting section N is a tubular element that introduces the exhaust gas from the collector pipe of the exhaust manifold or distributor M into the exhaust gas cleaning device Q. < Direction >

[0034] A “vertical direction” and a “longitudinal direction” used in the present description are, as described in Fig. Figure 1 is shown, based on the directions where the cylinder head E2 is positioned on a top or upward-facing side of the engine body E, the cylinder block E1 is positioned on a bottom or downward-facing side of the engine body E, and the exhaust manifold M is positioned on a rear side of the engine body E. Furthermore, a "lateral direction," as shown in Figure 1, means... Fig. Figure 2 shows a direction of a cylinder row of the engine body E, in other words a direction vertical to the paper surface of Fig. 1, where a near side means a side to the left and a far side means a side to the right. Furthermore, "upstream" and "downstream" can each mean an "upstream side in the direction of flow of the exhaust gas being discharged from the combustion chamber through the exhaust port" and a "downstream side in the direction of flow of the exhaust gas being discharged from the combustion chamber through the exhaust port".

[0035] In the present embodiment, a “longitudinal direction” parallel to a central axis L3 of a gasoline particulate filter 3 (hereinafter referred to as “GPF 3”) is defined as a particle filter (hereinafter referred to as “PF”), which will be described later as follows: Fig. 1 is shown. < Exhaust gas cleaning device >

[0036] The exhaust gas cleaning device Q comprises, as described in Fig. Figure 6 shows a three-way catalyst 2, which is connected to the outlet of the connecting section N, a GPF (gasoline particulate filter) 3, which is arranged on the downstream side of the three-way catalyst 2, and an L-shaped exhaust pipe 4, which connects the three-way catalyst 2 and the GPF 3. < Three-way catalytic converter >

[0037] The three-way catalyst 2 is a catalyst for cleaning hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) contained in exhaust gas. While specific descriptions are omitted here, the three-way catalyst 2 is produced by coating a catalyst component, formed by carrying a precious metal such as Pt, Pd, or Rh on a support made of a metal oxide, onto a honeycomb substrate. The three-way catalyst 2 is not specifically limited to this type of substrate; any known type is applicable.

[0038] As this is in Fig. As shown in Figure 6, the three-way catalyst 2 is a cylindrical catalyst with a central axis L2. The shape of the three-way catalyst 2 is not particularly restricted, although a cylindrical shape is preferred when arranging it in the exhaust gas path and to provide a uniform exhaust gas flow. The cross-sectional shape of the three-way catalyst 2, which is perpendicular to the central axis L2, is not particularly restricted; any shape, such as a completely round shape, an oval shape, a rectangular or right-angled shape, or a polygonal shape, is applicable. However, a completely round or oval shape may be preferred to ensure a uniform exhaust gas flow and to reduce manufacturing costs.

[0039] As this is in Fig. Figure 6 shows a catalyst body of the three-way catalyst 2, which performs exhaust gas purification, comprising an upstream end surface 2A and a downstream end surface 2B. For simplicity, the upstream end surface 2A and the downstream end surface 2B of the catalyst body are sometimes referred to as the upstream end surface 2A and the downstream end surface 2B of the three-way catalyst 2, respectively. Both end surfaces 2A and 2B have a circular shape and the same diameter.

[0040] The three-way catalyst 2 has a two-stage structure, comprising a front stage part 21, located on the upstream side, and a rear stage part 22, located on the downstream side, as the catalyst body. The front stage part 21 is a three-way catalyst that exhibits excellent low-temperature activity for cleaning low-temperature exhaust gases during operation at low engine loads. The rear stage part 22 is a three-way catalyst that exhibits excellent high-temperature activity for cleaning high-temperature exhaust gases during operation at high engine loads.While catalyst 2 is the two-stage structure comprising part 21 of the front stage and part 22 of the rear stage according to the present embodiment, any type of catalyst structure, such as a single catalyst structure or a triple or multiply subdivided structure, is applicable.

[0041] Furthermore, the three-way catalyst 2 includes a mat 23, which covers an outer circumference of the part 21 of the front stage and the part 22 of the rear stage as the catalyst body, and a cylindrical casing 24, which covers an outer circumference of the mat 23.

[0042] The exhaust gas temperature is approximately 400°C during light engine operation, while it is approximately 800°C during heavy engine operation. Accordingly, the three-way catalytic converter 2 is always exposed to the high-temperature exhaust gas that has passed through it. Therefore, there are concerns that the three-way catalytic converter 2 could deteriorate due to heat damage.

[0043] The mat 23 securely holds the part 21 of the front stage and the part 22 of the rear stage as the catalyst body itself under an environment where the catalyst body is exposed to the exhaust gas at high temperature, and this mat 23 is made of a material which has high heat resistance properties and heat retention properties, such as ceramic.

[0044] The casing or housing 24 holds the catalyst body (part 21 of the front stage and part 22 of the rear stage) and the mat 23, and this casing 24 is made of a metal, such as stainless steel or iron. Any other known material can be used for the mat 23 and the casing 24. < Petrol Particulate Filter GPF >

[0045] As this is in Fig. As shown in Figure 6, the GPF 3 is arranged on the downstream side of the three-way catalyst 2, which includes a filter body (cleaning device body) 33 for capturing particulate material (hereinafter referred to as "PM") contained in the exhaust gas passing through the three-way catalyst 2. While specific descriptions are omitted here, the filter body 33 is manufactured by, for example, sealing it to the honeycomb support or the like and adding filtering capacity, or it may have a catalyst coating to assist in the combustion of the captured PM.If the PM contained in the exhaust gas is captured on a dividing wall of the filter 33 and accumulates, a post-injection is performed after a main injection, in which fuel is injected into the combustion chamber during an expansion stroke of the engine to increase the temperature of the filter body 33. This post-injection is performed to increase the temperature of the filter body 33 and thus burn and remove the PM that accumulates on the filter body 33. The filter body 33 is not limited to the structure described above; any known structure is applicable.

[0046] As this is in Fig. As shown in Figures 1-3, the filter body 33 is a cylindrical element having a central axis L3. The shape of the filter body 33 is not particularly restricted, although a cylindrical shape is preferred to facilitate its placement in the exhaust gas path and to ensure a uniform flow of the exhaust gas. The cross-sectional shape of the filter body 33, which is substantially perpendicular to the central axis L3, is not particularly restricted, and any shape, such as a completely round shape, an oval shape, a rectangular or right-angled shape, or a polygonal shape, is applicable. However, a completely round shape or an oval shape is preferred to ensure a uniform flow of the exhaust gas and to reduce manufacturing costs.

[0047] As this is in Fig. As shown in Figure 6, the filter body 33 of the GPF 3 comprises an upstream end surface 3A and a downstream end surface 3B. For simplicity, the upstream end surface 3A and the downstream end surface 3B of the filter body 33 are sometimes referred to as the upstream end surface 3A and the downstream end surface 3B of the GPF 3, respectively. Both end surfaces 3A and 3B have a circular shape and the same diameter.

[0048] Similar to the three-way catalyst 2, the GPF 3 comprises the filter body 33, a mat 34 covering a portion of the outer circumference of the filter body 33, a tubular casing 35 covering a portion of the outer circumference of the mat 34, and a downstream cover 7 covering the downstream end face 3B of the filter body 33 with a gap or space. The tubular casing 35 and the downstream cover 7 constitute a filter casing and filter housing, respectively, which accommodate the filter body 33. The mat 34 and the tubular casing 35 are used for the same purpose as the mat 23 and the casing 24 of the three-way catalyst 2 described above, and the same structure is applicable. < L-shaped exhaust pipe >

[0049] The L-shaped exhaust pipe 4 is a tubular member which is formed in an L-shaped curved shape and connects the three-way catalytic converter 2 and the GPF 3, which forms a section of the exhaust path.

[0050] As this is in Fig. As shown in Figure 6, the L-shaped exhaust pipe 4 comprises an upstream opening 4A, a downstream opening 4B, and a bending section 4C located between the two openings 4A and 4B. The bending section 4C comprises a first tubular section 4C1 extending substantially in the cylinder bank direction (downstream side) from the upstream opening 4A, a second tubular section 4C2 extending towards the engine block from the downstream opening 4B, and a bending section 4C3 connecting the first tubular section 4C1 and the second tubular section 4C2. The bending section 4C3 comprises a bending section 4C31 on the outer circumferential side, which is positioned on an outer circumferential side of the L-shaped bend, and a bending section 4C32 on an inner circumferential side, which is located on an inner circumferential side oris positioned on the side of an inner circumference of the L-shaped bend.

[0051] As this is in Fig. As shown in Figure 6, a downstream section of the three-way catalyst 2 is inserted into the L-shaped exhaust pipe 4 through the upstream opening 4A. In contrast, an upstream end section of the GPF 3 is inserted into the L-shaped exhaust pipe 4 through the downstream opening 4B. - Relative arrangement of three-way catalytic converter and GPF -

[0052] Fig. 7, which is a sectional view taken along a line VII-VII of Fig. Figure 2 shows a cross-section of the exhaust gas cleaning device, which is vertical to the central axis L2 of the three-way catalyst 2 and passes through the GPF 3 and the exhaust gas discharge pipe 5 when viewed from a left-facing side. The cross-section shown in Fig. The line shown in Figure 7 will be designated as the "VII-VII cross-section". A line marked with a reference symbol PL32 in Figure 7 will be designated as the "VII-VII cross-section". Fig. The figure 7 shows a plane which includes the central axis L3 of the GPF 3 and is parallel to the central axis L2 of the three-way catalyst 2.

[0053] As this is in Fig. As shown in Figure 7, the position of the central axis L2 of the three-way catalytic converter 2 is located below the plane PL32, i.e., the central axis L3 of the GPF 3 is located on the VII-VII cross-section. This allows the exhaust manifold or distributor M to be located above the three-way catalytic converter 2, so that the exhaust system 1 can be provided in a suitably compact manner within the vehicle.

[0054] As this is in Fig. As shown in Figure 6, the downstream end surface 2B of the three-way catalyst 2 and the upstream end surface 3A of the GPF 3 are configured such that the angle α between the two surfaces is approximately 90 degrees at the bending section 4C. This angle α is not limited to this specific value; rather, to ensure sufficient exhaust gas flow from the three-way catalyst 2 to the GPF 3, an angle of approximately 60 to approximately 120 degrees is preferred, an angle of approximately 70 to approximately 110 degrees is more preferred, and an angle of approximately 80 to approximately 100 degrees is particularly preferred.

[0055] Additionally, the three-way catalyst 2 and the GPF 3 are configured such that the downstream section of the three-way catalyst 2 overlaps a section of the upstream end surface 3A of the GPF 3 when viewed in the axial direction of the GPF 3. That is, an overlap section 31 is formed on the three-way catalyst 2 and the GPF 3.

[0056] Fig. 6 is a sectional view, which runs along a line VI-VI from Fig. Figure 3 is taken, which shows a cross-section containing the central axis L2 of the three-way catalyst 2 and parallel to the central axis L3 of the GPF 3 when viewed from the top or upward-facing side. The cross-section, which is in Fig. Figure 6 is shown and will be referred to as the “VI-VI cross-section” (cross-section). As shown in Fig. Figure 6 shows a length H31 of the side surface of the three-way catalyst 2, which forms the overlap section 31, relative to a total length H2 of the three-way catalyst 2 preferably about 10 to about 50% in the VV cross-section for a compact arrangement of the three-way catalyst 2 and the GPF 3 and for a unification of the exhaust gas flow inside the GPF 3.

[0057] Furthermore, the length H31 of the side surface of the three-way catalyst 2 relative to a width W3 of the GPF 3 is preferably about 10 to about 50% in the VI-VI cross-section of Fig. 6 for a compact arrangement of the three-way catalyst 2 and the GPF 3 and for a more uniform exhaust gas flow in the GPF 3.

[0058] Thus, by providing the overlap section 31 of the three-way catalyst 2 and the GPF 3, in a case where the three-way catalyst 2 and the GPF 3 are arranged alternately in the lateral direction, the distance between a downstream end of the exhaust manifold M and the GPF 3 can be made correspondingly short. Furthermore, by regulating or controlling (limiting) an area where the overlap section 31 is provided within the region described above, the exhaust device 1 can be made properly or correspondingly compact, and the operational efficiency of the GPF 3, in particular of a section or area of ​​the GPF 3 which is positioned downstream of the overlap section 31, can also be properly or correspondingly improved. - First pipe section and second pipe section -

[0059] The L-shaped exhaust pipe 4 comprises, as shown in Fig. 6 and Fig. Figure 8 shows a first pipe section 40 and a second pipe section 41. That is, the L-shaped exhaust pipe 4 comprises, as shown in Fig. Figure 6 shows the first tube section 40 and the second tube section 41, which are connected to each other, with a connecting line provided on a substantially vertical surface that passes through at a position around the center of the downstream opening 4B. This connecting line passes by or through at a position near and on the downstream side of the downstream end surface 2B of the three-way catalyst 2.

[0060] The first pipe section 40 forms the upstream opening 4A, and the downstream opening 4B is formed by connecting the first pipe section 40 and the second pipe section 41. Specifically, the first pipe section 40 forms the upstream opening 4A and part of the downstream opening 4B and part of the bend section 4C, including bend section 4C32 on the inner circumferential side. The second pipe section 41 forms the remaining part of the downstream opening 4B and the remaining part of bend section 4C, including bend section 4C31 on the outer circumferential side.

[0061] Since the L-shaped exhaust pipe 4 is formed by the first pipe section 40 and the second pipe section 41, the L-shaped exhaust pipe 4 is easily formed (manufactured). Furthermore, since the bending section 4C32 on the inner circumferential side, which has a simple or slight stress concentration and a small radius of curvature, is formed by the first pipe section 40, i.e., the connection line is provided, thus avoiding a section where the load is easily concentrated, the durability of the L-shaped exhaust pipe 4 can be properly ensured.

[0062] In the present description, respective points are positioned at the uppermost and lowest sections of the L-shaped exhaust or outlet pipe 4 in a state where the exhaust device 1, which includes the L-shaped exhaust pipe 4, is located in Fig. Figure 8 shows the motor body E, which is attached to or assembled with it, designated as an upper or top section 4D and a bottom section 4E. In the present embodiment, the upper section 4D and the bottom section 4E are positioned near a connecting section of the first pipe section 40 and the second pipe section 41. - First wall section and second wall section -

[0063] The L-shaped exhaust pipe 4 comprises, as shown in Fig. 6 and Fig. As shown in Figure 8, a first wall section 42 and a second wall section 43, which guides the exhaust gas passing through the three-way catalyst 2 to the GPF 3. As shown in Figure 8, the system has a first wall section 42 and a second wall section 43, which guides the exhaust gas passing through the three-way catalyst 2 to the GPF 3. Fig. As shown in Figure 6, the first wall section 42 is directed towards the downstream end face 2B of the three-way catalyst 2, and the second wall section 43 is directed towards the upstream end face 3A of the GPF 3 and forms the bending section 4C31 on the outer circumferential side.

[0064] The first wall section 42 and the second wall section 43 are provided on the second pipe section 41, which forms the L-shaped exhaust pipe 4. Accordingly, a smooth wall surface without any connecting line can be formed by the first wall section 42 and the second wall section 43, so that turbulence of the exhaust gas flow can be properly suppressed.

[0065] The first wall section 42, which is directed towards the downstream end face 2B of the three-way catalyst 2, comprises, as shown in Fig. 6 and Fig. Figure 8 shows an upstream wall section 42C, which forms the downstream opening 4B, a downstream wall section 42A, which connects to the bend section 4C31 on the outer circumferential side, and an inclined wall section 42B, which smoothly connects the two wall sections 42A and 42C. The upstream wall section 42C projects beyond the downstream wall section 42A in the direction of the three-way catalyst 2. In other words, the downstream wall section 42A is configured to be a stepped section, recessed or offset outwards. These wall sections 42A, 42B, and 42C form part of the second tubular section 4C2.

[0066] Since the upstream wall section 42C projects beyond the downstream wall section 42A in the direction of the three-way catalyst 2, the exhaust gas that has passed through the three-way catalyst 2 and reached the upstream wall section 42C tends to flow towards the central side of the upstream end face 3A of the GPF 3, as shown in Fig. 6 is shown. That is, it prevents the exhaust gas flow from concentrating on a section of the GPF 3 which corresponds to a side on the outer circumference or outer circumferential side of the L-shaped bend of the L-shaped exhaust pipe 4, so that the exhaust gas flow is induced or excited in the direction of the section (shadow section) which is positioned behind the overlap section 31 of the GPF 3.

[0067] As this is in Fig. 6 and Fig. Figure 8 shows a seating section 47, where an upstream exhaust gas extraction section 81 of a differential pressure detector 8, which is in Fig. 2 is shown and will be described later, is arranged on the downstream wall section 42A, which is recessed or set off further outwards than the upstream wall section 42C, and an exhaust gas extraction opening 47A for pressure detection is formed on the seat section 47.

[0068] As this is in Fig. As shown in Figure 8, a seat section 44 is provided on the second pipe section 41 on the side of the upper section 4D of the L-shaped exhaust pipe 4. A NOx sensor 92 (detector) is mounted on this seat section 44, which is Fig. As shown in Figure 2, for example, a fixing opening or fixing port 92A for fixing the NOx sensor 92 is provided on the seat section 44.

[0069] This is shown by arrows with a solid line in Fig. As shown in Figure 6, the exhaust gas passes through the three-way catalyst 2, swirling upwards along a wall surface of the first wall section 42, and then flows into the GPF 3 from the L-shaped exhaust pipe 4. Since the downstream wall section 42A of the L-shaped exhaust pipe 4 is further away from the three-way catalyst 2 than the upstream wall section 42C, the flow velocity of the exhaust gas positioned near the downstream wall section 42A is low. Accordingly, the exhaust gas pressure on the upstream side of the GPF 3 can be detected reliably without being strongly influenced by the exhaust gas flow, as the exhaust gas is drawn from the upstream exhaust gas extraction section 81, which is located at the seat section 47 of the downstream wall section 42A.

[0070] Furthermore, since the exhaust gas passing through the three-way catalyst 2 does not directly contact a position around the seat section 44, where the NOx sensor 92 of the upper section 4D of the L-shaped exhaust pipe 4 is provided, the NOx concentration in the exhaust gas can be detected stably without being strongly influenced by the exhaust gas flow.

[0071] Any control or regulating device, including various sensors or the like, can be arranged differently from the downstream exhaust gas sampling section 81 or the NOx sensor 92 at the seat sections 44, 47. This ensures stable detection accuracy.

[0072] In this context, while the seat sections 44, 47 are formed in a flat shape or form, these can be formed in a shape with a curved or bent surface. < Downstream end section of the GPF >

[0073] As this is in Fig. 6 and Fig. As shown in Figure 7, an exhaust gas discharge opening 71, which introduces the exhaust gas passing through the GPF 3 into the exhaust gas discharge pipe 5, and an EGR gas extraction opening 70 for supplying a portion of the exhaust gas to the engine intake system as EGR gas are provided at a downstream end section 7 of the GPF 3. An EGR gas extraction pipe 6 is connected to the EGR gas extraction opening 70 via an EGR gas injection section 72A. < Exhaust gas discharge pipe >

[0074] The exhaust gas discharge pipe 5 guides the exhaust gas passing through the GPF 3 to a downstream exhaust gas or outlet system and retains and removes water, which is accompanied by the cleaning of the exhaust gas by means of the three-way catalytic converter 2 and the GPF 3.

[0075] A line which is marked by a reference symbol PRL31 in Fig. The line labeled 6 is a projection line of the central axis L3 onto the VI-VI cross-section. Furthermore, a line labeled L5 indicates a central axis of the exhaust gas discharge pipe 5. A point labeled P5 is located on the central axis L5 of the exhaust gas discharge pipe 5 and indicates the center of an inlet of the exhaust gas discharge pipe 5.

[0076] As this is in Fig. As shown in Figure 6, the center of the exhaust gas discharge opening 71 on the side of the three-way catalyst 2 is offset from the projection line PRL31 of the central axis L3 of the GPF 3. Conversely, the center P5 of the inlet of the exhaust gas discharge pipe 5 is also offset from the projection line PRL31 of the central axis L3 of the GPF 3 on the side of the three-way catalyst 2.

[0077] According to this structure, as is the case in Fig. 6 and Fig. Figure 9 shows a flow or stream of exhaust gas flowing into the GPF 3, directed towards the exhaust outlet or exhaust pipe 5, as indicated by arrows with a solid line in Fig. Figure 6 shows that, according to this exhaust gas flow, which is directed towards the exhaust gas outlet pipe 5, the amount of exhaust gas flowing into the section (shadow section) positioned behind the overlap section 31 increases. This improves the operating efficiency of the GPF 3.

[0078] Herein, the offset extent of the center P5 of the exhaust gas discharge pipe 5 can preferably be set or determined such that a surface 5A on the right side of the exhaust gas discharge pipe 5, which is positioned on the side of the three-way catalyst 2, is arranged on the right-facing side, i.e., on the side of the three-way catalyst 2, of a GPF side surface 3C of the GPF 3, which is positioned on the side of the three-way catalyst 2, on the VI-VI cross-section from aspects of improving the utilization efficiency of the GPF 3 by sufficiently ensuring the extent or quantity of exhaust gas that flows into the section which is positioned behind the overlap section 31.In this case, from the perspective of suppressing an increase in flow resistance around the exhaust gas discharge pipe 5, it is preferred that the offset extent of the exhaust gas discharge pipe 5 is determined such that a surface 5B of the left side of the exhaust gas discharge pipe 5, which is positioned on the left-facing side, is arranged on the left-facing side of the GPF side surface 3C of the GPF 3, which is positioned on the side of the three-way catalyst 2 on the VI-VI cross-section.

[0079] Furthermore, as this is shown in Fig. As shown in Figure 7, the exhaust discharge pipe 5 is located below level PL32. In other words, as shown in Figure 7, the exhaust discharge pipe 5 is located below level PL32. Fig. As shown in Figure 9, the central position P5 of the exhaust gas discharge pipe 5 is located below a central position 07 of the downstream cover 7. Thus, by positioning the exhaust gas discharge pipe 5 at a lower level than the GPF 3, the water that accompanies the cleaning of the exhaust gas by the three-way catalyst 2 and the GPF 3 can be effectively retained, collected, and drawn off in the exhaust gas discharge pipe 5. < EGR >

[0080] The engine block E is equipped with an EGR system to recirculate a portion of the exhaust gas to the engine's intake system for the purpose of preventing knocking and / or reducing the amount of nitrogen oxides (NOx). The EGR gas extraction pipe 6 (EGR path), which extends substantially forward, passing alongside (to the left of) the GPF 3, is located on the downstream side of the GPF 3.

[0081] As this is in Fig. As shown in Figure 6, the center of the EGR gas extraction port 70 is offset from the projection line PRL31, which corresponds to the central axis L3 of the GPF 3, on the opposite side to the exhaust gas discharge port 71. The EGR gas extraction pipe 6 is connected to an EGR gas inlet port 72 of a tip section of the EGR gas inlet section 72A, which projects towards one side of the GPF 3 (towards the opposite side to an arrangement side of the exhaust gas discharge pipe 5). The EGR gas extraction pipe 6 extends from the EGR gas inlet port 72 towards the engine body side on the side of the GPF 3, parallel to the central axis of the GPF 3. The EGR gas inlet port 72 is located below the central position 07 of the downstream cover 7 of the GPF 3, as shown in Figure 6. Fig. 9 is shown.

[0082] This allows, as shown by arrows with a solid line in Fig. As shown in Figure 6, the EGR gas is extracted in the direction of inertia of the exhaust gas when the exhaust gas, which is discharged from the three-way catalyst 2, passes through the L-shaped exhaust pipe 4. Accordingly, a sufficient quantity of EGR gas can be ensured. Furthermore, the EGR can be extracted while suppressing any mutual interference or interaction with the exhaust gas flow towards the exhaust gas discharge pipe 5. In addition, the exhaust gas flow in the GPF 3 can be distributed and homogenized laterally, thus further improving the efficiency, function, and performance of the GPF 3.

[0083] As this is in Fig. 6 and Fig. As shown in Figure 9, a seat section 77, where the downstream exhaust gas extraction port 77A opens or terminates, is provided on a section between the exhaust gas discharge port 71 and the EGR gas extraction port 70 on the downstream cover 7 of the GPF 3, and a downstream exhaust gas extraction section 82 of the differential pressure detector 8, which will be described later, is provided on this seat section 77. The exhaust gas flow is branched around the seat section 77 into one side of the exhaust gas discharge port 71 and one side of the EGR gas extraction port 70, where the exhaust gas flow velocity tends to be slow and uniform. Accordingly, the exhaust gas pressure can be detected without being strongly influenced by the exhaust gas flow, since the exhaust gas is extracted from the downstream exhaust gas extraction section 82.

[0084] This includes a chamber section 78, which has a floor section positioned below the seat section 77 at a lower level than the EGR gas extraction port 70. Even if condensed water generated in the EGR path flows backwards, this water remains in chamber section 78, thus preventing the EGR gas extraction port 70 and the EGR gas inlet section 72A from becoming blocked by the condensed water. < Differential pressure detector >

[0085] The differential pressure detector 8, for detecting or determining a pressure difference of the exhaust gas between the upstream and downstream sides of the filter body 33 of the GPF 3, is provided on the GPF 3, as shown in Fig. Figures 1-5 and others show the amount of PM that accumulates at GPF 3. This is calculated based on the pressure difference detected by differential pressure detector 8.

[0086] The differential pressure detector 8 includes, as described in Fig. 6, Fig. 10 and Fig. Figure 11 shows the upstream exhaust gas extraction section 81, which extracts the exhaust gas which is positioned on the upstream side of the filter body 33, the downstream exhaust gas extraction section 82, which extracts the exhaust gas which is positioned on the downstream side of the filter body 33, and a differential pressure sensor (differential pressure detection section) 83, which detects the pressure difference of the respective pressures of the exhaust gas which are extracted from the extraction sections 81, 82.

[0087] The upstream exhaust gas extraction section 81 is provided at the seat section 47 of the L-shaped exhaust pipe 4, as described above. In contrast, the downstream exhaust gas extraction section 82 is provided at the seat section 77 of the downstream cover 7 of the GPF 3, as described above. The upstream exhaust gas extraction section 81 and the differential pressure sensor 83 are connected by an upstream exhaust gas extraction pipe 81A, as shown in Fig. 2 and Fig. Figure 4 shows the downstream exhaust gas extraction section 82 and the differential pressure sensor 83, which are connected by a downstream exhaust gas extraction pipe 82A.

[0088] As this is in Fig. As shown in Figure 11 and elsewhere, the upstream exhaust gas extraction pipe 81A comprises an extraction pipe 81A1 and another extraction pipe 81A2, which is connected to the extraction line or extraction pipe 81A1. Furthermore, the downstream exhaust gas extraction pipe 82A comprises an extraction pipe 82A1 and another extraction pipe 82A2, which is connected to the extraction pipe 82A1.

[0089] As this is in Fig. As shown in Figures 1-3, the differential pressure sensor 83 is located on an upper side next to the GPF 3.

[0090] As this is in Fig. As shown in Figure 12, the differential pressure sensor 83 comprises a diaphragm 93 that receives pressure on both sides, and a pressure-difference detecting film (not illustrated) with a strain gauge is provided on one surface of the diaphragm or membrane 93. The diaphragm 93 is fixed to a printed circuit board 94 by an adhesive 95. An upstream pressure inlet opening 94a, which introduces the pressure of the exhaust gas taken from the upstream exhaust gas extraction section 81 into one side of a lower surface of the diaphragm 93, is formed on the printed circuit board 94. The strain gauge of the diaphragm 93 and the printed circuit board 94 are connected by a bonding wire 95. A cover 96, which covers the diaphragm 93 and the bonding wire 95, is attached to the printed circuit board 94 by an adhesive.A downstream pressure inlet opening 96a, which introduces the pressure of the exhaust gas taken from the downstream exhaust gas extraction section 82 into one side of an upper surface of the diaphragm 93, is formed on the cover 96. The diaphragm 93 and the bonding wire 95 are covered with a gel-like material 97.

[0091] The differential pressure sensor 83 is configured such that the strain gauge detects a strain of the diaphragm 93 caused by a difference between the exhaust gas pressures applied to the upper and lower surfaces of the diaphragm 93. That is, the pressure difference is detected as a change in electrical resistance caused by a deformation of the strain gauge.

[0092] In Fig. Reference numeral 11 denotes a first support element 85, which is fixed to the L-shaped exhaust pipe 4. A second support element 84 is fixed to this first support element 85, and the differential pressure sensor 83 is supported on the second support element 84 by means of a plate 83A that secures the differential pressure sensor. The second support element 84 is fixed to the cylinder block E1, as shown in Fig. Figure 1 shows that the second support member 84 is connected to the cylinder block E1 and the L-shaped exhaust pipe 4. This second support member 84 is used jointly to support the differential pressure sensor 83 and the L-shaped exhaust pipe 4 through the cylinder block E1.

[0093] This is an illustration of plate 83A, which defines the differential pressure sensor. Fig. 2 omitted.

[0094] The upstream exhaust gas sampling section 81 and the downstream exhaust gas sampling section 82 are each arranged on an upstream lower section and a downstream lower section of the GPF 3, respectively, to stabilize the pressure detection. In contrast, the differential pressure sensor 83 is arranged on an upper side of a side section of the GPF 3, thus improving the machinability and operation of the differential pressure sensor 83. Furthermore, the long extraction pipes or lines 81A1, 82A1 are configured to extend from the upstream exhaust gas extraction section 81 and the downstream exhaust gas extraction section 82, and the respective lengths of the extraction pipes 81A2, 82A2, which connect to these sections 81A1, 82A1, are configured to be long enough to facilitate the installation of a differential pressure sensor 8, which involves pipe connection work and the like.includes improvements.

[0095] Furthermore, the differential pressure sensor 83 and the upstream exhaust gas sampling section 81 are arranged on the same side as the EGR gas sampling pipe 6 relative to the GPF 3. Therefore, the upstream exhaust gas sampling pipe 81A can also be arranged on the same side as the EGR gas sampling pipe 6.

[0096] As this is in Fig. 3 and Fig. As shown in Figure 4, the EGR gas extraction pipe 6 is supported by an engine-related component, such as a transmission (not illustrated), via an EGR pipe support member 61. As shown in Figure 4, the EGR gas extraction pipe 6 is supported by an EGR pipe support member 61. Fig. 10 and Fig. As shown in Figure 11, the first support member 38, which supports the GPF 3, is fixed to the EGR gas extraction pipe 6. Furthermore, an extraction pipe support member 81A3, which supports the upstream exhaust gas extraction pipe 81A, is fixed to this first support member 38. This ensures, as shown in Fig. As shown in Figure 4, the upstream exhaust gas extraction pipe 81A is also supported by the EGR pipe support element 61. Thus, the compactness and layout of the device can be improved by supporting the upstream exhaust gas extraction pipe 81A using the EGR pipe support element 61. Other embodiments

[0097] While the exhaust device 1 of the first embodiment is applied to the FF vehicle, the present invention is applicable to an FR vehicle by configuring the exhaust device such that the independent exhaust pipes of the exhaust manifold or distributor M, which are connected to the four exhaust or outlet openings or ports, extend substantially backwards and connect to each other and then extend substantially backwards along a central side in the vehicle width direction of the engine body E.

[0098] While the upstream catalyst is the three-way catalyst 2 and the downstream particulate filter PF is the GPF 3 in the first embodiment, any other type or species of catalyst or particulate filter PF is applicable. For example, the upstream catalyst can be an oxidation catalyst or the like. Even in a case where the exhaust gas cleaning device 1 is applied to the diesel engine, a diesel particulate filter can be used as the PF.

[0099] As this is in Fig. As shown in Figure 9, the three-way catalyst 2 is positioned slightly below the GPF 3 in the first embodiment. In this respect, the three-way catalyst 2 can be arranged essentially at the same level as the GPF 3 or at a higher level than the GPF 3. In either case, however, the fixed position of the various sensors or the like, such as the seat section 44 or the wall section 42A, can be set or fixed at any suitable position so that the exhaust gas flow on the side of the bottom section 4E, the first connecting element 40, or the like is unified or homogenized, and this is not limited to the side of the upper section 4D of the exhaust pipe 4.

[0100] While the outlet at the downstream end of the exhaust manifold M is provided on the side of the first cylinder in the cylinder row direction of the engine, and the upstream opening 4A of the L-shaped exhaust pipe 4 is directed towards the side of the first cylinder in the cylinder row direction according to the first embodiment, the upstream opening 4A can be directed in any other direction according to the vehicle layout, for example towards the side of the fourth cylinder, towards the top or upward-facing side, or towards the bottom or downward-facing side.

[0101] In the first embodiment, the outlet at the downstream end or the downstream end outlet of the exhaust manifold M is arranged on the right-facing side in the cylinder row direction, and the exhaust pipe 4 is configured such that the upstream opening 4A is arranged on the right-facing or right-hand side, as shown in Fig. Figure 6 shows that the upstream opening 4A can be provided here to face any other direction, for example, towards the side of the four cylinders.

[0102] The exhaust system of the engine according to the present invention can properly or accordingly improve and stabilize the detection accuracy of the pressure difference by suppressing the adverse or unsuitable influence of the exhaust flow.

Claims

[1] Exhaust system for an engine, comprising: a particulate filter (GPF 3) which is provided or can be mounted on an exhaust or outlet path of the engine and comprises a filter body (33) for capturing a particulate material contained in the exhaust gas which is discharged from the engine, and a tubular filter casing (35) which accommodates the filter body (33); and a differential pressure detector (8) to detect a pressure difference between the exhaust gas located on an upstream side in an exhaust gas flow direction of the filter body (33) and the exhaust gas located on a downstream side in the exhaust gas flow direction of the filter body (33), wherein the differential pressure detector (8) comprises an upstream exhaust gas extraction section (81) which extracts the exhaust gas which is positioned on the upstream side in the exhaust gas flow direction of the filter body (33), a downstream exhaust gas extraction section (82) which extracts the exhaust gas which is positioned on the downstream side in the exhaust gas flow direction of the filter body (33), and a differential pressure detection section (83) to detect the pressure difference of the exhaust gas which is extracted through the upstream exhaust gas extraction section (81) and the downstream exhaust gas extraction section (82), an exhaust gas discharge opening (71) and an EGR gas extraction opening (70) are provided at a downstream end section of the tubular filter casing (35) such that a center of the EGR gas extraction opening (70) is located on the opposite side of the exhaust gas discharge opening (71) with respect to a central axis (L3) of the tubular filter casing (35), and the downstream exhaust gas extraction section (82) of the differential pressure detector (83) is provided between the exhaust gas discharge opening (71) and the EGR gas extraction opening (70) at the downstream end section of the filter casing (35). [2] Exhaust device according to claim 1, further comprising an L-shaped exhaust pipe (4) which is connected to an upstream side in the exhaust flow direction of the filter casing (35) and is configured to be bent in an L-shape, wherein a stepped section, which is recessed outwards, is provided on a section of a side wall at the outer circumference of the L-shaped bend of the L-shaped exhaust pipe (4), which is spaced remotely on one side of the filter body (33) from an L-shaped bending section of the L-shaped exhaust pipe (4), and the upstream exhaust gas extraction section (81) of the differential pressure detector (8) is provided on the stage section of the L-shaped exhaust pipe (4). [3] Exhaust device according to claim 2, wherein a catalyst (2) to clean the exhaust gas is connected to an upstream section of the L-shaped exhaust pipe (4), and a downstream section of the catalyst (2) is configured to overlap a section of an upstream end face of the filter body (33) when viewed in an axial direction of the particulate filter (GPF 3). [4] Exhaust device according to claim 1, wherein the particulate filter (GPF 3) is arranged laterally such that the exhaust gas passes through the particulate filter (GPF 3) in a lateral direction, an L-shaped exhaust pipe (4) is provided which is connected to an upstream side in the exhaust gas flow direction of the filter casing and is configured to be bent into an L-shape, the upstream exhaust gas extraction section (81) and the downstream exhaust gas extraction section (82) of the differential pressure detector (8) are each provided on a lower section of the L-shaped exhaust pipe (4) and a lower section of the downstream end section of the filter casing (35), and the differential pressure detection section (83) of the differential pressure detector (8) is provided around an upper side of the particulate filter (GPF 3). [5] Exhaust device according to claim 2 or 3, further comprising: an EGR gas extraction pipe (6) which is connected to the EGR gas extraction port (72) and is designed to pass alongside the particulate filter (GPF 3), corresponding to one side on the outer circumference of the L-shaped bend of the L-shaped exhaust pipe (4); an EGR pipe support member (61) which is provided next to the particulate filter (GPF 3) and supports the EGR gas extraction pipe (6); an upstream exhaust gas sampling pipe (81A) which connects the upstream exhaust gas sampling section (81) and the pressure differential detection section (83); and a sampling pipe support member (81A3) which is fixed to the EGR gas sampling pipe (6) and supports the upstream exhaust gas sampling pipe (81A). [6] Method for detecting a pressure drop of a particle filter (GPF 3), comprising the steps of: Providing an upstream exhaust gas extraction section (81) which extracts the exhaust gas which is located on the upstream side in the exhaust gas flow direction of a filter body (33) of the particulate filter (GPF 3), Providing a downstream exhaust gas extraction section (82) which extracts the exhaust gas which is located on the downstream side in the exhaust gas flow direction of the filter body (33), Providing a differential pressure detection section (83) to detect the differential pressure of the exhaust gas drawn through the upstream exhaust gas extraction section (81) and the downstream exhaust gas extraction section (82), Providing an exhaust gas discharge opening (71) and an EGR gas extraction opening (70) at a downstream end section of a tubular filter jacket (35) such that a center of the EGR gas extraction opening (70) is arranged on the opposite side of the exhaust gas discharge opening (71) with respect to a central axis (L3) of the tubular filter jacket (35), and Arranging the downstream exhaust gas extraction section (82) between the exhaust gas discharge opening (71) and the EGR gas extraction opening (70) at the downstream end section of the filter body (33). [7] The method of claim 6, further comprising the steps of: Connecting an L-shaped exhaust pipe (4) to an upstream side in the exhaust flow direction of a filter casing (35) of the filter body (33), Providing a stage section which is set off outwards on a section of a side wall on an outer circumference of an L-shaped bend of the L-shaped exhaust pipe (4), which is spaced remotely on one side of the filter body (33) from the L-shaped bend section of the L-shaped exhaust pipe (4), and Providing the upstream exhaust gas extraction section (81) at the stage section of the L-shaped exhaust pipe (4). [8] The method of claim 7, further comprising the steps of: Connecting a catalyst (2) for cleaning the exhaust gas to an upstream section of the L-shaped exhaust pipe (4), and Forming a downstream section of the catalyst (2) such that it overlaps a section of an upstream end face of the filter body (33) when viewed in an axial direction of the particle filter (GPF 3).

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