JP3165033B2 - Diesel particulate filter device for vehicle installation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for collecting particulates in exhaust gas discharged from a diesel engine mounted on a vehicle, and regenerating the filter by heating and burning the collected particulates. The present invention relates to a vehicle mounted diesel particulate filter device.

[0002]

2. Description of the Related Art Conventionally, an example of a diesel particulate filter device is disclosed in Japanese Patent Application Laid-Open No. 7-189657. The diesel particulate filter device is branched into two branch passages each having an on-off valve, and a filter element having a heater is provided in each branch passage, and these are merged downstream. Each of the branch passages has a hollow cylindrical shape with one end closed, and exhaust gas is introduced from the exhaust passage upstream from the open end of the porous filter element, and the exhaust fine particles in the exhaust gas while passing the exhaust gas from the inner periphery to the outer periphery of the filter. And a heater for collecting and removing the collected exhaust fine particles by incineration. Further, in the diesel particulate filter device, a hollow cylindrical tube is fixed between the outer peripheral wall of the filter element and the outer peripheral wall of the filter element so as to cover the outer peripheral portion of the filter element in order to perform uniform regeneration while preventing wasteful consumption of electric power. Are arranged with the gap of
A plurality of communication holes are formed through the peripheral wall near both ends of the hollow cylindrical tube.

Conventionally, a diesel particulate filter device is mounted on a vehicle, for example, as shown in FIG. The vehicle 20 equipped with the diesel engine 31
The frame 18 extends between the front and rear wheels 33, and the frame 1
8, a fuel tank 32, a diesel engine 31, a propeller shaft 19, and exhaust pipes 16 and 17 are attached. In order to mount the diesel particulate filter device 40 on the vehicle 20, it is installed between the exhaust pipe 16 and the exhaust pipe 17. As described above, the conventional diesel particulate filter device 40 has the pair of filters 34 and 35 arranged in parallel in the width direction of the vehicle 20. In order to purify the exhaust gas exhausted from the diesel engine 31, the inlet-side exhaust passage connected to the exhaust pipe 16 is branched into two exhaust passages 36, 37 for flowing the exhaust gas to the respective filters 34, 35. . The exhaust gas purified by the filters 34 and 35 is
Outlet side exhaust passages 38, 3 connected to
From 9, they are collected by a collecting pipe and connected to an exhaust pipe 17.

[0004]

The above-mentioned diesel particulate filter device has a function of regenerating the filter main body by heating and burning the particulates collected by the filter main body, and always captures the particulates. In order to collect, it was necessary to equip two or more filter elements. Then, the particulates in the exhaust gas are collected by one of the filter elements, and when a predetermined amount of the particulates is collected, the switching valve is switched to regenerate the filter element. I was collecting particulates inside.

However, Japanese Patent Laid-Open No. 7-18965, cited above,
In the diesel particulate filter device disclosed in Japanese Patent Publication No. 7 (1995), since the filters are arranged in parallel in the width direction, it is difficult to mount the filter on a vehicle in which space in the width direction is strict. In order to equip two or more filters, exhaust pipes are required for each filter in order to distribute exhaust gas exhausted from the engine to each filter. Therefore, the total volume of the filter and the exhaust pipe is required. ,
That is, the space for disposing the filter is increased, and it is difficult to mount the exhaust gas purifying device on the vehicle.

As shown in FIG. 5, in order to mount the diesel particulate filter device 40 on the vehicle 20, vehicle components such as the frame 18, the propeller shaft 19, and the fuel tank 32 are present. Since they interfere with each other as indicated by reference numerals A and B, the diesel particulate filter device 40 cannot be deformed and mounted at the expense of purification efficiency, or a space in the width direction cannot be secured in the vehicle 20. There is a problem.

[0007]

Means for Solving the Problems The object of the invention is to solve the above problems, the carbon contained in the exhaust gas discharged from a diesel engine mounted on a vehicle, HC, particulates such as SO _X A case in which a pair of filters for trapping air are arranged in a straight line in series, the exhaust gas flow is switched to one of the filters by switching a switching valve, and one filter collects particulates, and the other filter collects particulates. The case is disposed in the axial direction of the vehicle, that is, in the longitudinal direction, and the inlet-side exhaust passage extending from the exhaust pipe to the inlet and the outlet-side exhaust passage extending from the filter outlet to the exhaust pipe are provided on the outer surface of the filter. It is arranged along the longitudinal direction of the opposing position of the vehicle, shortened in the width direction of the vehicle, extended in the longitudinal direction, and formed into a substantially square shape as a whole cross-sectional shape, making it compact. And it is to provide a diesel particulate filter system for a vehicle mounted.

According to the present invention, a cylindrical case is installed in the middle of an exhaust pipe through which exhaust gas discharged from a diesel engine mounted on a vehicle flows so as to extend in the front-rear direction of the vehicle. A valve case portion, a front filter disposed on the front side case portion with respect to the valve case portion, and having an inlet opening to the valve case portion;
A rear filter disposed at a rear side of the valve case from the valve case and having an inlet opening to the valve case; and a rear filter provided at the valve case for opening and closing the respective inlets of the front filter and the rear filter. A switching valve, an inlet-side exhaust passage leading from the exhaust pipe to the inlet, and an outlet-side exhaust passage leading from the outlet to the exhaust pipe. The inlet-side exhaust path and the outlet-side exhaust The passages are each formed in a substantially triangular cross-section, and each of the inlet-side exhaust passages and each of the outlet-side exhaust passages are arranged along a longitudinal direction of a position facing the outer surface of the case, and the entire cross-sectional shape is substantially equal. The present invention relates to a vehicle mounted diesel particulate filter device having a square shape.

In the diesel particulate filter device for mounting on a vehicle, the outer surface of the case is formed to have a substantially square cross section, and the inlet side exhaust passage and the exhaust gas passage are formed on a surface of the case opposite to the outer surface having the substantially square cross section. An outlet-side exhaust passage is arranged.

Further, the present invention provides a tubular case which is installed in the exhaust pipe for discharging exhaust gas from a diesel engine mounted on a vehicle so as to extend in the front-rear direction of the vehicle, and a front case portion of the case. A front filter disposed, a rear filter disposed on a rear case portion of the case, and a branch branched from the exhaust pipe on the upstream side of the case and disposed along a longitudinal direction of a position facing an outer surface of the case. An inlet-side exhaust passage communicating with an inlet of the front-side case portion; an inlet-side exhaust passage branched from the exhaust pipe and communicating with an inlet of the rear-side case portion disposed along a longitudinal direction of a position facing an outer surface of the case; A switching valve provided at a branch of the exhaust pipe for opening and closing the passage, the front exhaust passage and the rear exhaust passage, and an outlet of the front case. An outlet-side exhaust passage, which communicates with the exhaust pipe on the downstream side of the case and is disposed along a longitudinal direction of a position facing the outer surface of the case, and an outlet side of the rear-side case portion that opens to the exhaust pipe. The present invention relates to a vehicle-mounted diesel particulate filter device comprising an exhaust passage.

As described above, this diesel particulate filter device mounted on a vehicle has a case in which at least two filters are housed in a straight line in the front-rear direction of the vehicle, that is, in the longitudinal direction of the vehicle. The exhaust passage that connects to the case is arranged along the longitudinal direction of the position facing the outer surface of the case, and the cross-sectional shape of the entire device is configured to be substantially square, so that the length in the width direction of the vehicle can be shortened and the width direction can be reduced. In addition, the space can be saved, and the vehicle can be easily mounted on a vehicle or the like in which a space is provided linearly in the longitudinal direction. Further, since each of the inlet-side exhaust passages and each of the outlet-side exhaust passages are formed in a substantially triangular cross-sectional shape, the cross-sectional shape is set in the longitudinal direction of the opposing surface of the outer surface of the substantially rectangular case. When each of the inlet-side exhaust passages and each of the outlet-side exhaust passages are attached, the cross-sectional shape of the entire device is formed in a substantially square shape, whereby the device itself can be stably fixed to the vehicle.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a diesel particulate filter device for a vehicle according to the present invention; FIG. 1 is a schematic explanatory view of a vehicle incorporating a vehicle mounted diesel particulate filter device according to the present invention, FIG. 2 is a schematic explanatory view showing one embodiment of a vehicle mounted diesel particulate filter device according to the present invention, and FIG. FIG. 3 is a front view of FIG. 2. Since the vehicle shown in FIG. 1 is substantially the same as the vehicle shown in FIG. 5, the same components are denoted by the same reference numerals, and redundant description will be omitted.

The on-vehicle diesel particulate filter device 1 of this embodiment has a cylindrical shape incorporated in exhaust pipes 16 and 17 for exhausting exhaust gas exhausted from a diesel engine 31 mounted on a vehicle 20. Case 2 is provided. The case 2 is disposed so as to extend in the vehicle front-rear direction.
9. A front case 21 is formed forward of the vehicle 20 from the valve case 29, and a rear case 22 is formed rearward of the vehicle 20 from the valve case 29. The front side case part 21 and the rear side case part 22 are linearly arranged in series. Therefore, the outlet 10 of the front case part 21 is located on the exhaust pipe 16 side on the upstream side,
The outlet 11 of the rear case portion 22 is located on the exhaust pipe 17 side on the downstream side. The exhaust pipe 16 on the upstream side communicates with the engine 31, and the exhaust pipe 17 on the downstream side communicates with the atmosphere exhaust side.

The front filter 3 is disposed on the front case 21 and the rear filter 4 is disposed on the rear case 22. The front filter 3 and the rear filter 4, for example, sandwich the inner and outer peripheral sides of a filter element made of a non-woven fabric of ceramic fiber with a heat-resistant metal mesh, process it into a pleated shape and form it into a cylindrical shape. One of the metal meshes is configured as a heater 90 that can be energized. The inlet 8 of the front filter 3 opens into the valve case 29 and the inlet 9 of the rear filter 4
Is opened in the valve case portion 29, the inlet 8 of the front filter 3 and the inlet 9 of the rear filter 4 are located on opposite sides of each other, and are arranged linearly in the axial direction on the opposite side to the outlets 10, 11. . An inlet 30 is formed in the valve case 29, and the switching valve 7 is disposed inside. The switching valve 7 is operated to switch the opening and closing of the inlet 8 of the front filter 3 and the inlet 9 of the rear filter 4 according to a command from the controller 80.

In the diesel particulate filter device 1 for mounting on a vehicle, the outer surface of the case 2 is formed to have a substantially square cross section. An exhaust passage 5 on the inlet side leading to the inlet 8 of the front filter 3 and an inlet 9 of the rear filter 4 leading from the exhaust pipe 16 on the upstream side to the inlet 30 of the valve case portion 29, and exhaust gas on the downstream side from the outlet 10 of the front filter 3. Tube 1
The outlet-side exhaust passage 6 leading to 7 is arranged along the longitudinal direction of the facing surface of the outer surface of the case 2. Further, the outlet 11 of the rear filter 4 opens to the exhaust pipe 17 on the downstream side. Front case portion front filter 3 disposed within 21 and a rear filter 4 disposed in the rear side case portion 22, carbon contained in the exhaust gas discharged from a diesel engine, HC, etc. SO _X Patti The curates are collected, and the particulates collected in the filters 3 and 4 are heated and incinerated to regenerate the filters 3 and 4. Therefore, the exhaust gas from the engine 31 flows through the inlet-side exhaust passage 5, and the exhaust gas from which the particulates are collected and purified flows through the outlet-side exhaust passage 6.

In the diesel particulate filter device 1, the exhaust gas flowing from the inlet 39 of the valve case 29 is supplied from the inlet 8 or 9 to the front filter 3 in the front case 21 or the rear filter in the rear case 22. 4 is introduced. In FIG. 2, the switching valve 7 opens the inlet 8 of one of the front-side case portions 21, flows exhaust gas to the front filter 3 in the front-side case portion 21, and removes particulates in the exhaust gas by the front filter 3. The inlet 9 of the other rear case part 22 is closed, and the rear case part 2 is closed.
It is switched so as to regenerate the rear filter 4 in 2. The exhaust gas from which particulates have been collected and purified by the front filter 3 is discharged to the exhaust pipe 17 through the exhaust passage 6.

In the diesel particulate filter device 1, as shown in FIG. 3, in particular, the exhaust passages 5 and 6 are formed to have a substantially triangular cross section, and the exhaust passages 5 and 6 Since it is arranged at each of the four positions in the longitudinal direction at the opposing position, the cross-sectional shape of the entire device is formed in a substantially square shape. In this embodiment, the case 2 is formed separately from the exhaust passages 5 and 6, and the mounting flange 27 provided in the exhaust passages 5 and 6 is exchangeably mounted on the mounting flange 28 provided in the case 2. ing.

The filters 3 and 4 are formed in hollow cylindrical bodies, and the end faces of the inlets 8 and 9 are shielded by shielding plates 12 and 13. An exhaust gas inflow side passage 25 is formed between the front case part 21 and the outer peripheral surface of the front filter 3, and an exhaust gas inflow side passage 26 is formed between the rear case part 22 and the outer peripheral surface of the rear filter 4. Are formed.
The hollow portion of the front filter 3 forms an outlet passage 23 for the purified exhaust gas, and the hollow portion of the rear filter 4 forms an outlet passage 24 for the purified exhaust gas. The outlet side of the filters 3 and 4 is located at the outlet side passage 2 in the hollow part.
Except for 3 and 24, they are shielded by shielding plates 14 and 15. Therefore, the exhaust gas is caused to flow from the outer peripheral side of the filters 3 and 4 to the hollow portion, and the particulates in the exhaust gas are collected by the filters 3 and 4. In FIG. 2, the flow of the exhaust gas is indicated by solid arrows, and a state in which the front filter 3 is collecting particulates in the exhaust gas and a state in which the rear filter 4 is regenerating (or stopped) are shown. . In FIG. 2, the exhaust gas flow is shown by imaginary lines for the reverse case of collecting by the rear filter 4 and regenerating the front filter 3.

Further, each of the filters 3 and 4 is provided with a heater 90 as a heating means for heating and burning the collected particulates. The heater 90 is
At least one of the metal meshes disposed on the inner and outer peripheral surfaces of the filters 3 and 4 which hold the filter element is used as at least one of the metal meshes, in this embodiment, the metal mesh on the outer peripheral surface side. The heating control is performed by a command from the controller 80. The switching valve 7 that opens and closes the inlets 8 and 9 of the front case portion 21 and the rear case portion 22 is switched in response to the amount of particulate collected by the filters 3 and 4.
The amount of particulates collected by the filters 3 and 4 is determined by, for example, detecting the exhaust gas pressure at the inlets 8 and 9 where the exhaust gas flows into the filters 3 and 4, and measuring the ratio of the detected pressure. Can be detected.

Further, the diesel particulate filter device 1 can be conventionally provided instead of a silencer at a mounting position of a silencer (not shown) mounted on the vehicle 20, and is applied as a substitute for the silencer. External noise was measured for the case where the diesel particulate filter device 1 was provided on the vehicle 20 and the case where a conventional silencer was provided for the vehicle, and the following results were obtained. That is, while the acceleration noise of the current silencer was 83 dB, the acceleration noise of the diesel particulate filter device 1 was 79.5 dB.
The proximity noise of the current silencer was 71 dB, while the proximity noise of the diesel particulate filter device 1 was 69.8 dB. Therefore, since the diesel particulate filter device 1 can function as a silencer, by incorporating the silencer at the position of the silencer mounted on the vehicle 31 instead of the silencer, the functions of purifying exhaust gas and reducing noise are also used. Can be done.

Next, another embodiment of a diesel particulate filter device for mounting on a vehicle according to the present invention will be described with reference to FIG. In this embodiment, the arrangement of the front filter and the rear filter is similar to that of the above embodiment, but the mounting of the exhaust passage is different. As shown in FIG. As for the function, the same effect can be exhibited.

The vehicle-mounted diesel particulate filter device 41 is provided with exhaust pipes 16 and 17 through which exhaust gas from a diesel engine 31 mounted on the vehicle 20 flows.
A cylindrical case 42 is incorporated so as to extend in the front-rear direction of the vehicle. The case 42 is arranged to extend in the vehicle front-rear direction, and a valve case 59 is provided at a branch portion of the exhaust pipe 16 in front of the case 42. Case 42
Is divided into a front side case portion 61 and a rear side case portion 62 by a shielding plate 54, and both are linearly arranged in series. A front filter 43 is disposed on the front case 61, and a rear filter 44 is disposed on the rear case 62. The front filter 43 and the rear filter 44 are formed in a hollow cylindrical body.

The inlet-side exhaust passages 56 branched from the exhaust pipe 16 on the upstream side of the case 42 are respectively arranged along the longitudinal direction of the position facing the outer surface of the case 42 and open to the side surface of the front case portion 61. It communicates with the inlet 48. The inlet-side exhaust passage 55 branched from the exhaust pipe 16 is
It is arranged along the longitudinal direction of the position facing the outer surface of the case 42, and communicates with an inlet 49 opened on the side surface of the rear case portion 62. The inlet side exhaust passages 55 and 56 are
It is switched and opened and closed by a switching valve 47 arranged in the valve case 59. The outlet-side exhaust passage 57 communicates with the exhaust pipe 17 on the downstream side of the case 42 through the passage 60 where the outlet 50 of the front-side case portion 61 opens, and extends along the longitudinal direction of the position facing the outer surface of the case 42. Are located. The outlet 51 of the rear case portion 62 opens to the exhaust pipe 17 through the outlet-side exhaust passage 58.

The front end surfaces of the front case 61 and the rear case 62 are shielded by shielding plates 52 and 53. An exhaust gas inflow passage 45 is formed between the front case portion 61 and the outer peripheral surface of the front filter 43, and an exhaust gas inflow passage 46 is formed between the rear case portion 62 and the outer peripheral surface of the rear filter 44. Are formed. The hollow portion of the front filter 43 forms an outlet passage 63 for the purified exhaust gas, and the hollow portion of the rear filter 44 forms an outlet passage 64 for the purified exhaust gas. The outlet sides of the filters 43 and 44 are shielded by shielding plates 65 and 66 except for the outlet passages 63 and 64 in the hollow portions. Therefore, the exhaust gas is caused to flow from the outer peripheral side of the filters 3 and 4 to the hollow portion, and the particulates in the exhaust gas are collected by the filters 3 and 4. In FIG. 2, the flow of the exhaust gas is indicated by solid arrows, and a state in which the front filter 3 is collecting particulates in the exhaust gas and a state in which the rear filter 4 is regenerating (or stopped) are shown. . In FIG. 4, when the switching valve 47 is switched to collect particulates by the rear filter 4, and the particulates collected by the front filter 3 are heated and incinerated to regenerate the front filter 3, the exhaust gas flow Are indicated by imaginary arrows.

[0025]

According to the diesel particulate filter device mounted on a vehicle according to the present invention, as described above, a case for accommodating two filters is disposed linearly in the longitudinal direction, and the entire device has a substantially square cross section. Although it is formed, the length in the axial direction becomes longer, but the length in the width direction can be shortened. Therefore, it can be used for vehicles where the space in the width direction is tight, and for vehicle parts such as propeller shafts, fuel tanks, suspension devices, etc. It can be mounted easily and properly without interference,
It is possible to mount a diesel particulate filter with the optimum purification capacity without sacrificing the purification efficiency. Therefore, this diesel particulate filter device can be easily installed in the middle of the exhaust pipe of the vehicle, and since the entire device is formed in a substantially square cross section, the mounting state of the device itself is stably fixed. Is done.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a vehicle incorporating a vehicle mounted diesel particulate filter device according to the present invention.

FIG. 2 is a schematic explanatory view showing an embodiment of a vehicle mounted diesel particulate filter device according to the present invention.

FIG. 3 is a front view showing one embodiment of the diesel particulate filter device of FIG. 2;

FIG. 4 is a schematic explanatory view showing another embodiment of the vehicle mounted diesel particulate filter device according to the present invention.

FIG. 5 is a schematic explanatory view of a vehicle incorporating a conventional diesel particulate filter device.

[Explanation of symbols]

 1,41 Diesel particulate filter device 2,22 Case 3,4,43,44 Filter 5,6,55,56,57 Exhaust passage 7,47 Switching valve 8,9,30,48,49 Inlet 10,11, 50,51 Outlet 16,17 Exhaust pipe 20 Vehicle 21,61 Front case 22,22 Rear case 29,59 Valve case

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-79209 (JP, A) JP-A-6-26325 (JP, A) JP-A-5-65818 (JP, A) JP-A-57-79 13211 (JP, A) JP-A-57-65812 (JP, A) JP-A-60-184917 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01N 3/02 B60K 13 / 04

Claims (3)

(57) [Claims] 1. A cylindrical case which is installed in an exhaust pipe through which exhaust gas exhausted from a diesel engine mounted on a vehicle flows so as to extend in the front-rear direction of the vehicle, and a valve formed at a central portion of the case. A case, a front filter disposed on the front side of the valve case from the valve case and having an inlet opening to the valve case, and a front filter disposed on the rear side of the valve case and connected to the valve case; A rear filter having an inlet opening, a switching valve provided in the valve case portion for opening and closing the respective inlets of the front filter and the rear filter, respective inlet-side exhaust passages leading from the exhaust pipe to the inlet, And each outlet-side exhaust passage leading from the outlet to the exhaust pipe ,
A cross section of each of the inlet-side exhaust passages and each of the outlet-side exhaust passages
Each of the inlet-side exhaust passages is formed in a substantially triangular shape.
And each of the outlet side exhaust passages at a position facing the outer surface of the case.
Are arranged along the longitudinal direction of the
A vehicle-mounted diesel particulate filter device having a substantially square shape . 2. The outer surface of the case has a substantially rectangular cross section.
And the outer shape of the case having a substantially square cross section.
The inlet-side exhaust passage and the outlet-side exhaust passage on opposite surfaces
2. The diesel particulate filter device for mounting on a vehicle according to claim 1, wherein the filter is disposed . 3. A tubular case which is installed in the exhaust pipe through which exhaust gas from a diesel engine mounted on a vehicle flows out so as to extend in the front-rear direction of the vehicle, and is disposed in a front case portion of the case. front filters, rear case portion disposed in the rear filter of the case, the front of which is arranged along the longitudinal direction of the position facing the outer surface of and the casing is branched from the exhaust pipe upstream of the case An inlet-side exhaust passage leading to the inlet of the side case,
The opposing position of outer surfaces of the branched and the casing from the exhaust pipe
An inlet-side exhaust passage leading to an inlet of the rear-side case portion, which is arranged along a longitudinal direction of the exhaust passage, and a branch portion of the exhaust pipe for opening and closing the front-side exhaust passage and the rear-side exhaust passage. switching valve, downstream the communication with the exhaust pipe and the outer surface longitudinally disposed along the outlet side exhaust passage of the opposite position of the case of the case of the outlet of the front-side case portion, and the exhaust pipe vehicle mounting diesel particulate filter device consists of and an outlet-side exhaust passage of the rear casing section which is open to.