JPH06307225A - Exhaust particulate eliminator of diesel engine - Google Patents

Abstract

PURPOSE:To delay the deterioration timing of the whole of a device by parallely providing two filters in an exhaust passage, and periodically changing the regenerating order of the filters, so as to bring each other the degrees of the deterioration of two filters close to. CONSTITUTION:Particulates in exhaust gas are simultaneously collected by two sets of filters 5A, 5B parallely provided in an exhaust pipe 2 of a diesel engine l. When the regenerating timing is judged in collecting, one filter 5B continues the collection while the other filter 5A carries out the regeneration by a regenerating means. After the regenerative processing is finished, particulates are collected by the filter 5A, and the regenerative processing of the filter 5B is carried out by the regenerating means. After that, the simultaneous collection by the filters 5A, 5B is carried out. The regenerating order of two sets of filters 5A, 5B is periodically changed in regenerating after the simultaneous collection. Thus, the degrees of the deterioration of two filters can be brought closely to each other, and the deterioration timing of the whole of the device can be made closer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing exhaust particulates of a diesel engine, and more particularly to a device for collecting particulates contained in exhaust gas at the same time by two filters and carrying out a regeneration process alternately. The present invention relates to an exhaust particulate removal device for a diesel engine that can delay the deterioration time of the entire device by controlling the degree of deterioration of the filter in the same manner.

[0002]

2. Description of the Related Art Exhaust gas of an internal combustion engine of an automobile or the like, especially a diesel engine, contains exhaust particulates (particulates) containing carbon as a main component, which is a cause of exhaust black smoke. From the viewpoint of environmental pollution, it is desirable to remove the particulates. In recent years, it has been proposed to dispose a diesel particulate by this filter by disposing a ceramic filter in the exhaust passage of the diesel engine.

[0003] In an exhaust particulate remover configured to remove particulates by a ceramic filter disposed in the exhaust passage of a diesel engine, the particulates trapped inside the particulate filter when the particulate filter is used. When the amount of the particulate matter is increased, the air permeability is gradually lost and the engine performance is deteriorated. Therefore, it is necessary to periodically regenerate the filter in which the particulates are trapped to some extent.

The judgment of the regeneration time is made by detecting the amount of particulates trapped in the filter, and the amount of particulates trapped in the filter is usually detected by the exhaust gas on the upstream side of the particulate filter. And the differential pressure (pressure loss) on the downstream side. That is, it is judged that the regeneration time is reached when the pressure difference becomes larger than a predetermined value.

In the filter regeneration process, generally, a filter that collects particulates is separated from an exhaust gas flow path by an exhaust cutoff valve, and a regeneration gas, for example, secondary air is supplied to the filter into which the exhaust gas does not flow. At the same time, the electric heater is energized and heated to ignite the particulates in the filter and burn the particulates.

In an apparatus having only one filter in the exhaust passage, when the filter is regenerated, the exhaust gas must be discharged by bypassing the regenerating filter, and the exhaust gas cannot be purified during this period. . Therefore, the present inventor arranges two filters in parallel in the exhaust passage without providing a bypass passage, simultaneously collects the two filters, and first executes the regeneration processing of one filter at the regeneration time. However, during this time, exhaust gas is made to flow to the other filter to discharge the purified exhaust gas, and when the regeneration of one filter is completed, the collection and regeneration are exchanged, and the regeneration of the other filter is completed. At the time point, an exhaust particulate purifying apparatus that switches to simultaneous collection by two filters has already been proposed (see Japanese Patent Laid-Open No. 3-134215).

[0007]

However, in the device proposed in Japanese Unexamined Patent Publication No. 3-134215, the order of reproduction in the reproduction processing is always the same, so that the amount of trapped by the filter which is reproduced later becomes large. During the regeneration, the filter that regenerates later is repeatedly subjected to a larger heat load than the filter that regenerates first, and there is a fear that the filter that regenerates later is more likely to deteriorate first.

In view of the above, the present invention provides an exhaust particulate removal device for a diesel engine in which two filters are provided in parallel in the exhaust passage, and the two filters are used to simultaneously collect and alternately perform regeneration processing. The exhaust particulate removal apparatus is capable of delaying the deterioration time of the entire apparatus by making the heat loads of the two filters closer to each other by periodically replacing the two, and making the degrees of deterioration of the two filters closer to each other. The purpose is to

[0009]

According to the present invention, there is provided a device for removing exhaust particulates of a diesel engine, wherein two sets of filters arranged in parallel in an exhaust passage of an internal combustion engine simultaneously capture particulates in exhaust gas. When it is judged that it is time to collect the light, the one filter continues the collection while the other filter carries out the regeneration processing by the regeneration means, and after the regeneration processing is completed, the other filter collects. In addition, in the exhaust particulate removal device of the diesel engine in which the regeneration processing of the one filter is performed by the regeneration means and then the simultaneous collection is performed, the regeneration of the two sets of filters is performed at the time of the regeneration processing after the simultaneous collection. The feature is that the order is changed regularly.

[0010]

According to the exhaust particulate remover of the diesel engine of the present invention, the particulates in the exhaust gas are simultaneously collected by the two filters, and when the two filters come to the regeneration time, the filters are alternately switched one by one. It is regenerated. Then, the reproduction order of the two filters at the time of the reproduction processing is periodically changed, and the number of times the two filters are reproduced first and the number of times the two filters are reproduced are close to each other in a long period.

[0011]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of an embodiment of an exhaust particulate removing device 20 of a dual filter type diesel engine of the simultaneous collection and reverse flow alternating regeneration according to the present invention. In the exhaust gas particulate remover 20 of the diesel engine of this embodiment, the exhaust pipe 2 for guiding the exhaust gas from the engine 1 is
It branches into branch pipes 2A and 2B at the branch portion a, and then merges at the merge portion b to be connected to the muffler 6. Casing 3 provided in the middle of the branch pipes 2A, 2B
A first filter 5A and a second filter 5B are provided in A and 3B, respectively, for collecting particulates in the exhaust gas.

Each of the filters 5A and 5B is a honeycomb filter having partition walls made of a porous material such as ceramic, and is generally cylindrical, and has a large number of rectangular parallelepiped passages (filter cells) surrounded by partition walls. ). Adjacent ones of these passages are closed passages that are alternately plugged with ceramic plugs (plugs) on the exhaust gas inflow side and the exhaust gas outflow side. Therefore, the particulates in the exhaust gas flowing into the filters 5A and 5B are collected by the filter cell when the exhaust gas passes through the wall surface of the filter cell.

Further, pressure introducing pipes SPU and SPD are provided on the upstream side of the branch portion a of the branch pipes 2A and 2B and on the downstream side of the joining portion b, respectively, and the differential pressure sensor 10 is provided upstream of the branch portion a. The pressure on the side and the pressure on the downstream side of the merging portion b are introduced. Then, the pressure difference (pressure loss) between the upstream and downstream sides of the filters 5A and 5B is obtained by the differential pressure sensor 10, and the detected value is input to the ECU (control circuit) 100. The control circuit 100 determines the regeneration timing of the filters 5A and 5B based on this pressure difference (differential pressure).

On the other hand, electric heaters HA and HB for heating the filters and igniting the particulates near the downstream end faces of the filters 5A and 5B, or at the plug members (not shown) at the downstream end, during filter regeneration. The electric heaters HA and HB have one end grounded and the other end connected to the battery 11 via switches SWA and SWB controlled by the control circuit 100. Furthermore, filter 5
A temperature sensor ST that detects the exhaust gas temperature is provided upstream of A and 5B, and the detected value ThG of the exhaust temperature of this temperature sensor ST is also input to the control circuit 100. Although not shown, the engine 1 is provided with an intake air temperature sensor that detects the intake air temperature ThA, an intake air amount sensor that detects the intake air amount Ga, and a water temperature sensor that detects the temperature of the engine 1 by the water temperature ThW. Intake air temperature ThA, intake air amount Ga, and water temperature ThW from these sensors
Is also input to the control circuit 100.

The branch part a is provided with a first control valve V1 for distributing the flow of exhaust gas from the exhaust pipe 2 on the upstream side of the branch part a to the branch pipes 2A and 2B, and the junction part b is branched. A second control valve V2 is provided for switching the connection to the exhaust pipe 2D on the downstream side of the joining portion b of the pipes 2A and 2B. Both of the control valves V1 and V2 are driven by the control circuit 100, and the control valves V1 and V2 are controlled by a control signal from the control circuit 100 so that the branch pipes 2A and 2B are not closed, or a branch position. It is positioned at a position where either one of the tubes 2A and 2B is closed.

At the time of reproducing the above-mentioned filters 5A and 5B,
It is necessary to energize the electric heater HA or HB, to flow the regeneration gas from the downstream side of the energized side of the filter 5A or the filter 5B, and to discharge the combustion gas from the upstream side. Therefore, in this embodiment, the branch pipe 2
A regeneration gas supply pipe 7 is provided between the merging portion b of A and 2B and the filters 5A and 5B, and an electric air pump 9 for supplying secondary air is provided at one end of the regeneration gas supply pipe 7. ing. A check valve V3 is provided in the regeneration gas supply pipe 7 on the secondary air discharge side of the electric air pump 9, and an opening / closing valve V5 is provided at a connection portion of the regeneration gas supply pipe 7 to the branch pipes 2A and 2B. , V6 are provided.

A combustion gas discharge pipe 8 is provided between the branch portions a of the branch pipes 2A and 2B and the filters 5A and 5B, and one end of the combustion gas discharge pipe 8 is open to the atmosphere. A check valve V4 is provided near the open end of the combustion gas discharge pipe 8, and opening / closing valves V7 and V8 are provided at the connection portions of the combustion gas discharge pipe 8 to the branch pipes 2A and 2B, respectively. The valves V3 to V8 and the electric air pump 9 are all driven and controlled by the control circuit 100.

The valves V1 to V8 are actually driven by a diaphragm type actuator, a negative pressure switching valve, or an electric type actuator, but the drive mechanism is not particularly limited, and therefore is shown here. And their description is omitted. The control circuit 100 includes, for example, an interface INa for inputting an analog signal, an interface INd for inputting a digital signal, a converter A / D for converting an analog signal into a digital signal, a central processing unit CPU for performing various arithmetic processes, and a random access memory RA.
M, read-only memory ROM, backup memory B that retains data even when the engine key switch is turned off
Although it is configured by a microcomputer including a RAM, an output circuit OUT, and a bus line 111 that connects these, a detailed description of the operation of the configuration is omitted.

The particulate filter 5 is provided in the interface INa for inputting the analog signal of the control circuit 100.
A differential pressure signal PD of the exhaust gas on the upstream and downstream sides of A and 5B,
Intake air temperature signal ThA, intake air amount Ga, water temperature signal T of the engine 1
Engine speed signal N from hW or a speed sensor (not shown)
e or the like is input, and a signal or the like from the key switch is input to the interface INd for inputting a digital signal.

Next, the control circuit 10 of the exhaust particulate remover 20 of the diesel engine of the embodiment constructed as described above.
An example of the operation of 0 will be described with reference to the flowchart shown in FIG. The routine shown in FIG. 2 is actually executed in the form of an interrupt at predetermined time intervals, but here, in order to simply show the overall flow of processing, a series of processing is regarded as a continuous flow from start to end. An interval is provided in the middle of the processing in order to show that the processing is executed every predetermined time. All subsequent flow charts will be described in this form.

During operation of the engine 1, the control valves V1 and V2 are controlled to the neutral position, and the check valves V3 and V4 and the open / close valves V5 to V8 are closed. FIG. 1 shows this state, in which the exhaust gas discharged from the diesel engine 1 flows through both the branch pipes 2A and 2B and the filters 5A and 5B.
The particulates are removed by B and are discharged into the atmosphere through the muffler 6.

In this state, the differential pressure PD, the exhaust gas temperature ThG, and the intake air amount Ga are detected in step 201, and the exhaust gas temperature ThG and the intake air amount Ga are detected in step 202.
The detected value of the differential pressure PD is corrected based on the corrected differential pressure PDc
Is calculated. In the following step 203, it is determined whether or not it is the regeneration time by comparing the corrected differential pressure PDc with the determination value. When it is not the reproduction time, the process returns to step 201 again after a predetermined interval indicated by □, and then step 201.
The processing from step 203 to step 203 is repeated. On the other hand, if the amount of particulates trapped in the filters 5A and 5B exceeds the predetermined value and the differential pressure correction value PDc of the differential pressure sensor 10 on the upstream side and the downstream side of the filters 5A and 5B exceeds the reference value, step 2
In 02, it is judged to be the reproduction time, and the routine proceeds to step 204.

In step 204, it is determined whether or not the flag FA indicating the filter reproduction order is "1". When the flag FA is "1", the filter 5A is reproduced first, and the filter 5B is reproduced later. When the flag FA is "0", the filter 5B is reproduced first and the filter 5A is reproduced later. Show. Then, it is assumed that the value of the flag FA when the engine 1 is first operated is "1".

First, the case of FA = “1” will be described. At this time, the process proceeds to step 205, and the filter regeneration process is executed from the filter 5A. When the filter 5A is regenerated, the control valves V1 and V2 close the inlet side and the outlet side of the branch pipe 2A, and the exhaust gas is discharged from the muffler 6 into the atmosphere through the filter 5B. In this state, check valves V3 and V4
Further, the opening / closing valves V5 and V7 are opened, the secondary air from the air pump 9 is supplied to the filter 5A through the regeneration gas supply pipe 7, and the heater HA is energized. In this process, the particulates in the filter 5A are burned, and the combustion gas is discharged into the atmosphere through the combustion gas discharge pipe 8.

While the regeneration process of the filter 5A as described above is being executed, it is determined in step 206 whether or not the regeneration of the filter 5A is completed. When the filter reproducing process is not completed, the reproducing process is continued, and thereafter, the determination of step 206 is repeated for each predetermined interval until the reproducing is completed. On the other hand, in step 206, the filter 5
When it is judged that the reproduction of A is completed, the routine proceeds to step 207, where it is judged whether the flag FA indicating the reproduction order of the filter is "1". Since FA = “1” at this time, the routine proceeds to step 208, where the regeneration of the filter 5B is executed.

During regeneration of the filter 5B, the control valves V1 and V
2 is switched to block the inlet side and the outlet side of the branch pipe 2B,
The exhaust gas comes to flow through the filter 5A that has been regenerated. Then, while the check valves V3 and V4 remain open, the open / close valves V5 and V7 close and the open / close valves V6 and V8 open. The secondary air from the air pump 9 is the regeneration gas supply pipe 7
Through the filter 5B, the heater HB is energized, and the particulates in the filter 5B burn.
The combustion gas is discharged into the atmosphere through the combustion gas discharge pipe 8.

While the regeneration process of the filter 5B as described above is being executed, it is judged in step 209 whether or not the regeneration of the filter 5B is completed. When the filter reproducing process is not completed, the reproducing process is continued, and thereafter, the determination of step 209 is repeated for each predetermined interval until the reproducing is completed. On the other hand, in step 209, the filter 5
When it is determined that the reproduction of B is completed, the routine proceeds to step 210, where it is determined whether the flag FA indicating the reproduction order of the filter is "1". Since FA = “1” at this time, the process proceeds to step 211, the value of the flag FA is changed to “0”, and the process proceeds to step 212.

In step 212, the control valves V1 and V2 are controlled to the neutral position so that the exhaust gas flows through both the filter 5A and the filter 5B. And check valve V
3, V4 and the on-off valves V5 to V8 are all closed, and the operation of the electric air pump 9 is stopped. In this way, at the time of regeneration after simultaneous collection using the filters 5A and 5B,
The regeneration process is first performed from the filter 5A, then the regeneration process of the filter 5B is performed, and when both regeneration processes are completed, in step 211, the flag FA is set so that the regeneration process is performed from the filter 5B side at the next regeneration time. Change the value of.

Next time, in step 203, the filter 5
If it is determined that A and 5B have reached the reproduction time, FA =
Since it is "0", it becomes NO in the next step 204, and the routine proceeds to step 208, where the regeneration of the filter 5B is executed first. Then, when the regeneration of the filter 5B is completed, it is determined to be NO in step 210, so step 20
In step 5, the reproduction process of step 5A is continuously executed. When the reproduction of the filter 5A is completed, YES is determined in step 206 and the process proceeds to step 207. Since FA = “0” at this time, the process proceeds to step 213. In step 213, the value of the flag FA is changed to "1" in order to perform the reproduction process from the filter 5A at the next reproduction time, and the process proceeds to step 212.

In step 212, the control valves V1 and V2 are controlled to the neutral position so that the exhaust gas flows through both the filter 5A and the filter 5B. And check valve V
3, V4 and the on-off valves V5 to V8 are all closed, and the operation of the electric air pump 9 is stopped. In this way, at the time of regeneration after simultaneous collection using the filters 5A and 5B,
The regeneration process is first performed from the filter 5B, then the regeneration process of the filter 5A is performed, and when both regeneration processes are completed, in step 213, the flag FA is set so that the regeneration process is executed from the filter 5A side at the next regeneration time. Change the value of.

In the embodiment described above, the order of regeneration of the filters 5A and 5B is exchanged at each regeneration time. As a result, even if the amount of collected particulates of the filter that is regenerated later increases and the heat load during regeneration increases, the filter that is regenerated later is not fixed and is replaced every time, so one filter is replaced. It is possible to prevent the deterioration of the exhaust particulate removal device 20, and to delay the deterioration timing of the exhaust particle removing device 20.

In the control procedure of FIG. 2, the filter that is first regenerated at each regeneration time is replaced, but the filter that is first regenerated at the regeneration time is not replaced each time, and may be replaced periodically at predetermined times. good. The flowchart shown in FIG. 3 shows an embodiment in which the filters to be reproduced first at the reproduction time are replaced every K times, and this processing will be briefly described.

First, when FA = "1", the filter 5
When A and 5B reach the regeneration time, the routine proceeds from step 301 to step 302, where it is judged as YES and the regeneration process of the filter 5A is executed at step 303. Then, when it is determined in step 304 that the regeneration of the filter 5A is completed, YES is determined in step 305, and therefore the process proceeds to step 306, and the regeneration process of the filter 5B is executed.
When the reproduction process of the filter 5B is completed in step 307, the process proceeds to step 308, and YES is determined here, and the process proceeds to step 309.

In step 309, the filter 5 is added at the regeneration time.
The number N of times when the regeneration process of A is performed first and the regeneration process of the filter 5B is performed afterwards is counted. It is assumed that the number of times N is 0 in the initial value. Therefore, the number of times N is increased in step 309 each time the regeneration process of the filter 5A is performed first after the regeneration time and the regeneration process of the filter 5B is performed later. Step 310 is the number of times N
Has reached K times, and when N is smaller than K, the routine proceeds to step 315, where the filters 5A, 5
This routine is terminated by setting B in the collecting state. Therefore,
At this time, the regeneration process of the filter 5A is performed first even at the next regeneration time.

On the other hand, the filter 5A after the regeneration time
When the number of times N of performing the regeneration process of the filter 5B later is performed K times, the process proceeds from step 310 to step 311, the value of the flag FA is set to "0", and the value of the number of times N is set. After clearing and proceeding to step 315, the filters 5A and 5B are set in the collecting state, and this routine ends.

Thus, in step 311, FA =
When it becomes "0", when the filters 5A and 5B reach the regeneration time from the next time, the routine proceeds from step 301 to step 302, where it is judged as NO and the routine proceeds to step 306 where the regeneration processing of the filter 5B is executed first. Step 307
When the reproduction processing of the filter 5B is completed in step 308
Then, the flow also returns to NO in step 303 and proceeds to step 303.
In step 303, the reproduction process of the filter 5A is executed.

If it is determined in step 304 that the regeneration of the filter 5A is completed, the answer is NO in step 305, so the flow proceeds to step 312, and the filter 5B is regenerated at the regeneration time.
The reproduction process of 1 is performed first, and the number M of times the reproduction process of the filter 5A is performed afterwards is counted. It is assumed that the number M of times is also 0 in the initial value. Therefore, after the regeneration time comes, the regeneration process of the filter 5B is performed first to
Each time the reproduction process of A is performed later, the number M of times is increased in step 312. In step 313, it is determined whether or not the number of times M has reached K times. When M is less than K, the process proceeds to step 315 and filters 5A and 5B are performed.
Is set to the collecting state, and this routine ends. Therefore, at this time, the regeneration process of the filter 5B is performed first even at the next regeneration time.

On the other hand, after the regeneration time, the filter 5B
When the number of times M of performing the regeneration process of the filter 5A afterwards is performed K times, the process proceeds from step 313 to step 314, the value of the flag FA is set to "1", and the value of the number of times M is set. After clearing and proceeding to step 315, the filters 5A and 5B are set in the collecting state, and this routine ends. As a result, from the next time, when the regeneration time comes, the filter 5A will be regenerated first.

In the embodiment described above, the order of regeneration of the filters 5A and 5B is switched every time the regeneration time of K times is reached. As a result, in the long run, the filter 5A and the filter 5B are regenerated at the same time earlier at the regeneration time, so that one of the filters will not be deteriorated earlier, and the exhaust particle removal device 20 will be deteriorated. Can be delayed.

In the diesel particulate filter 20 of the diesel engine shown in FIG. 1, the regeneration timing of the filter 5A and the filter 5 is determined by the correction value P of the average differential pressure between the two filters.
It's Dc. In this case, if the pressure difference between the upstream and downstream sides of the individual filters 5A and 5B varies, or if the inner diameter of the exhaust gas flow passage including the casings 3A and 3B varies, the amount of particulate matter trapped by the filters 5A and 5B is reduced. The amount is biased toward the filter with the smaller differential pressure, resulting in different heat loads.

In such a case, the differential pressure in the individual flow paths of the filter 5A and the filter 5B is detected in advance when the exhaust particulate removal device 20 of the diesel engine is manufactured, and the two are adjusted so that they have the same differential pressure value. . As shown in FIG. 4, this adjustment is performed at the connection between the casing 3 and the exhaust pipe 2 having the smaller differential pressure, that is, at the flange 3F provided at the end of the casing 3 and the end of the exhaust pipe 2. This can be performed by sandwiching the differential pressure adjusting ring 4 having an inner diameter smaller than the inner diameter of the exhaust pipe 2 between the formed flanges 2F. This differential pressure adjusting ring 4 is provided on the casing 3 on the downstream side of the filter 5.
It is better to attach it to the connection between the exhaust pipe 2 and the exhaust pipe 2. this is,
This is because when the filter 5 is attached to the connecting portion between the casing 3 on the upstream side of the filter 5 and the exhaust pipe 2, the pressure difference changes due to adhesion of particulates to the pressure difference adjusting ring 4. The inside diameter of the chain double-dashed line shown in the opening of the exhaust pipe 2 in FIG. 4 shows the effect of reducing the inside diameter of the exhaust pipe 2 by attaching the differential pressure adjusting ring 4.

The exhaust particle removing apparatus 20 for the diesel engine in the above-described embodiment uses the filters 5A and 5B to simultaneously collect the particulates in the exhaust gas, and the secondary air is used as the exhaust gas flow at the regeneration time. The present invention is an exhaust particulate removal device for a diesel engine of the simultaneous collection and reverse flow alternate regeneration type, which is a simultaneous capture and reverse flow alternate regeneration type in which the filters 5A and 5B are alternately regenerated by flowing from the opposite direction. It is not limited. For example, filters 5A and 5B as shown in FIG. 5 are used to simultaneously collect particulates in the exhaust gas, and secondary air is caused to flow from the same direction as the flow of the exhaust gas at the time of regeneration to filter 5A and 5B.
The present invention can also be applied to the exhaust particulate removal device 30 of a diesel engine of the simultaneous collection and forward flow alternating regeneration type that alternately regenerates.

In the exhaust particulate matter removing device 30 of the diesel engine shown in FIG. 5, the same components as those of the exhaust particulate matter removing device 20 of the diesel engine are designated by the same reference numerals, so that the configuration thereof is omitted. The description is omitted. FIG. 6A is a partially cutaway plan view of a vehicle in which the exhaust particulate removal device 20 of the diesel engine shown in FIGS. 1 and 5 is actually mounted. Since the vehicle 50 of this embodiment is a shared vehicle and is driven by rear wheels, the exhaust particle removing apparatus 20 of the present invention is provided under the floor between the front wheels and the rear wheels 52 and at the entrance / exit 5.
It is located at the rear of the 3.

In FIG. 6 (a), 60 is a vehicle body frame, 61 is a diesel engine, 62 is a propeller shaft, 63 is a differential gear, 64 is an exhaust pipe of the engine 61, 65 is a muffler, and 66 is an exhaust manifold. . The exhaust particulate removal device 20 of this embodiment is provided in the exhaust pipe 64 upstream of the muffler 65,
The arrangement position is on the side of the vehicle frame 60 on the side where the fuel tank (not shown) is not attached, and
1 and behind the vehicle entrance / exit 52.

In this embodiment, the exhaust manifold 66 of the engine 61 is on the right side in the direction of travel of the vehicle, and the exhaust particulate remover 20 is disposed on the left side in the direction of travel of the vehicle. Therefore, the exhaust pipe 64 connected to the exhaust manifold 66 is connected to the propeller shaft 6 disposed in the center of the vehicle 50 in the traveling direction.
After arranging in the lateral direction of the vehicle 50 so as to traverse 2, the air-particle removal device 20 is connected. In this case, the exhaust pipe 64
The vehicle crossing portion is firmly supported by the vehicle body frame 60 by a support mechanism (not shown).

Further, the exhaust particulate removing device 2 of this embodiment
0 performs reverse flow regeneration, so the combustion gas exhaust pipe 8 is connected to the vehicle 5
It is in the direction of 0. The combustion gas discharge port of the combustion gas discharge pipe 8 can be opened to the side surface in the traveling direction of the vehicle 50, but when the combustion gas is discharged from the combustion gas discharge pipe 8 to the side surface side of the vehicle 50 while the vehicle is traveling, It may be mistaken for a vehicle failure. Therefore, in this embodiment, the combustion gas exhaust pipe 8 extends in the longitudinal direction of the vehicle body frame 60, and the opening 8A thereof has the opening 6A of the exhaust pipe 64 as shown in FIG. 6 (b).
It is provided so as to line up with 4A. In this way, even if the combustion gas is discharged from the opening 8A of the combustion gas discharge pipe 8 while the vehicle is traveling, there is no risk that it will be mistaken for a vehicle failure.

On the other hand, when the combustion gas exhaust pipe 8 is provided so as to extend in the longitudinal direction of the vehicle body frame 60 as shown in FIG. 6A, as shown in FIG.
The height h1 of the side combustion gas exhaust pipe 8 from the ground E needs to be higher than the height h2 of the opening 8A of the combustion gas exhaust pipe 8 from the ground E. This is because even if condensed water is generated in the combustion gas discharge pipe 8 by the combustion gas, the condensed water does not collect in the combustion gas discharge pipe 8 and the opening 8
This is for discharging from A. As a countermeasure against this condensed water, a condensed water reservoir 12 may be provided on the upstream side of the combustion gas discharge pipe 8. Further, cooling fins 13 may be provided on the outer circumference of the combustion gas discharge pipe 8 on the upstream side of the condensed water reservoir 12.

Further, as shown in FIG. 7 (b), the condensed water sump 12 is kept so that the condensed water accumulated in the condensed water sump 12 does not overflow.
Alternatively, a siphon-type condensed water discharge pipe 14 may be provided.

[0049]

As described above, according to the exhaust particle removing apparatus for a diesel engine of the present invention, the exhaust passage is provided with two filters in parallel, and the two filters are used to simultaneously collect and alternately perform regeneration processing. In the exhaust gas particulate remover of a diesel engine that performs the above-mentioned operation, the heat load of the two filters can be made closer by periodically changing the regeneration order of the filters, so that the degree of deterioration of the two filters can be made closer. Therefore, it is possible to delay the deterioration time of the entire apparatus.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of an exhaust particulate removal apparatus of the simultaneous collection and reverse flow alternate regeneration dual filter type of the present invention.

FIG. 2 is a flowchart showing an example of a procedure of collecting and reproducing processing of two filters of the control circuit of FIG.

FIG. 3 is a flowchart showing another embodiment of a procedure of collecting and reproducing processing of two filters of the control circuit of FIG.

FIG. 4 is an assembled perspective view illustrating an adjustment method in the case where the upstream and downstream differential pressures of the two branch pipes are different in the exhaust particulate removal device of FIG.

FIG. 5 is a diagram showing a schematic configuration of an embodiment of an exhaust particulate removal device of the simultaneous collection and forward flow alternate regeneration dual filter type of the present invention.

FIG. 6 is a partially cutaway plan view showing a schematic configuration of an embodiment in which the backflow regeneration type exhaust particulate removal device of the present invention is installed in an actual vehicle.

FIG. 7 (a) is an explanatory view for explaining the height regulation of the combustion gas exhaust pipe arranged as shown in FIG. 6 with respect to the ground, and FIG.
It is an expanded sectional view which shows the structure of an example of the condensed water reservoir of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Diesel engine 2 ... Exhaust pipe 2A, 2B ... Branch pipe 4 ... Differential pressure adjustment ring 5A, 5B ... Filter 7 ... Regeneration gas supply pipe 8 ... Combustion gas discharge pipe 8A ... Opening 9 ... Air pump 10 ... Differential pressure sensor 12 ... Condensed water reservoir 13 ... Fin 100 ... Control circuit a ... Branching part b ... Merge part HA, HB ... Electric heater V1 ... First control valve V2 ... Second control valve V3, V4 ... Check valve V5-V8 ... Opening and closing valve

Claims (1)

[Claims] 1. A pair of filters provided in parallel in an exhaust passage of an internal combustion engine collects particulates in exhaust gas at the same time, and one filter collects when it is judged that it is time to regenerate. While the other filter is continued, the other filter performs the regeneration process, and after the regeneration process is completed, the other filter collects it, and at the same time, the one filter performs the regeneration process by the regeneration unit, and then simultaneously captures it. An exhaust particulate removal device for a diesel engine, characterized in that the regeneration order of the two sets of filters is periodically changed during the regeneration process after simultaneous collection.