JPH06264715A - Regeneration method of exhaust gas filter for diesel engine - Google Patents

Abstract

PURPOSE:To prevent bad influence on the driving feeling by reducing variation of the back pressure of a entire exhaust gas filter before and after regeneration when regeneration is taking place on a filter unit composing the exhaust gas filter. CONSTITUTION:A plural number of filter units 3 are arranged parallel to each other inside a housing 2 of an exhaust gas filter 1. Each filter unit 3 is equipped with a heater to burn and remove accumulations. An opening on the filter unit 3 is opened and shutted with a lid 22 which is actuated by an actuator 21. The heater is heated and accumulations burnt under the condition of exhaust gas flowing into the filter unit 3 being substantially intercepted when the filter unit 3 is regenerated. After accumulations are burnt, the lid 22 is slowly opened and exhaust gas is gradually introduced into the filter unit 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for regenerating an exhaust gas filter for a diesel engine, and more particularly to a method for regenerating an exhaust gas filter for a diesel engine mounted on an automobile.

[0002]

2. Description of the Related Art Conventionally, as a filter for removing particulates contained in exhaust gas of a diesel engine,
Various things have been proposed. When the filter accumulates a certain amount of particulates due to use, the accumulated particulates cause an increase in the back pressure of the exhaust pipe and a reduction in the output of the engine. To prevent this, it is necessary to remove the accumulated particulates and regenerate the filtration function.

Practically preferred is a filter that can be regenerated while the engine is running. As such a filter, Japanese Patent Application Laid-Open No. 2-256812 proposes a filter device including a large number of filter units incorporating an electric heater for removing accumulated particulates. In this device, a ceramic fiber filtration material and an electric heating element (heater) are alternately wound in a plurality of layers on the outer peripheral surface of a breathable support material (a metal cylinder having a large number of through holes formed therein). Therefore, voids of various sizes are formed by the ceramic fiber filtration material in the radial direction of the breathable support material, and when the exhaust gas of the diesel engine is passed through, particulates in the exhaust gas are collected in the state of being close to the heater. . Then, when the heater is energized, the particulates burn efficiently. Therefore, the filter units can be regenerated even when the engine is in operation by shifting the energization times to the plurality of filter units and sequentially regenerating them.

The particulates are mainly composed of carbon, and in order to burn them, it is necessary to raise the temperature to 600 ° C. or higher. The flow rate of the exhaust gas flowing through the filter unit during the operation of the engine varies depending on the structure of the device, the displacement of the engine, and the rotation speed, but it becomes considerable. When the filter unit is regenerated with the exhaust gas flowing into the filter unit, the heat generated by the heater is carried away by the exhaust gas flow passing through the filter unit.
As a result, the heat generated by the heater is not effectively used for burning the particulates, and the power consumption increases. As a method for eliminating this inconvenience, a method has been proposed in which, during regeneration of the filter unit, the particulates are burned while the inflow of exhaust gas into the filter unit is temporarily blocked. That is, at the time of regeneration, after blocking the inflow of exhaust gas into the filter unit, the heater is energized to heat the heater for a predetermined period of time required for burning particulates. After the lapse of a predetermined time, the flow of exhaust gas into the filter unit is restarted. In this regeneration method, when the inflow of exhaust gas into the filter unit is shut off, the shutoff is immediately performed. Further, immediately after the regeneration, the interruption is released so that the amount of the exhaust gas introduced into the filter unit becomes the value at the normal time.

[0005]

If the introduction of the exhaust gas into a part of the filter units is cut off for regeneration of the filter unit, the back pressure becomes high because the passage area of the exhaust gas is reduced. Further, when the introduction of the exhaust gas into the filter unit is started after the regeneration, the passage area of the exhaust gas increases and the back pressure becomes low. In the past, since the inflow of exhaust gas was shut off and the shutoff was quickly performed, the change in the back pressure of the filter as a whole when the inflow was shut off and when the shutoff was released was large as shown in FIG. In particular, the back pressure after the regeneration of the filter unit is significantly reduced.

The back pressure increase and the back pressure decrease do not adversely affect the operation of the engine. However, a change in engine output due to a change in back pressure deteriorates the driving feeling. The present invention has been made in view of the above problems, and an object thereof is to reduce a change in the back pressure of the entire filter before and after the regeneration when regenerating the filter unit that constitutes the filter, and to improve the driving feeling. An object of the present invention is to provide a method for regenerating an exhaust gas filter for a diesel engine, which can prevent adverse effects.

[0007]

In order to achieve the above object, according to the present invention, a plurality of filter units each having a heat source for regeneration are provided in parallel, and the deposits are sequentially burned and removed for each filter unit. In the exhaust gas filter for a diesel engine that regenerates the filter unit by doing so, when the filter unit is regenerated, the heat source is made to heat while the inflow of the exhaust gas to the filter unit is substantially blocked, and the deposit is burned. After combustion, the exhaust gas was gradually introduced into the filter unit.

Further, in the invention described in claim 2,
In addition to the above configuration requirements, when substantially blocking the inflow of exhaust gas into the filter unit to be regenerated, the amount of exhaust gas introduced into the filter unit is gradually decreased.

[0009]

According to the first aspect of the invention, when the exhaust gas filter is used and particulates or the like are deposited on each filter unit and the back pressure rises to a predetermined value, some of the filter units are regenerated. The regeneration is performed in a state where the introduction of the exhaust gas into the filter unit is substantially cut off, and the deposit is burned and removed by the heat generation of the heat source. After burning the deposit, the exhaust gas is introduced into the filter unit, and the filtration of the exhaust gas in the filter unit is restarted. When restarting the introduction of the exhaust gas, the introduction of the exhaust gas into the filter unit is gradually performed.

The resistance of the exhaust gas passing through the regenerated filter unit is smaller than that of the other filter units. Therefore, when the exhaust gas is allowed to freely flow into the filter unit after regeneration, most of the exhaust gas passes through the filter unit having a small resistance, and the back pressure of the entire filter sharply decreases. However, since the exhaust gas is gradually introduced into the filter unit, it is possible to prevent the back pressure of the entire filter from rapidly decreasing.

Further, according to the invention described in claim 2, when the inflow of the exhaust gas into the filter unit to be regenerated is substantially interrupted, the exhaust gas is introduced into the filter unit so as to be gradually decreased. To be done. Therefore, the rising speed of the back pressure becomes gentle.

[0012]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, a plurality of (7 in this embodiment) filter units 3 are arranged in parallel in a housing 2 of an exhaust gas filter 1 for a diesel engine. The housing 2 is formed in a cylindrical shape, and an exhaust gas introduction pipe 4 is projectingly provided on a peripheral surface near the first end thereof, and an exhaust pipe 5 is projectingly provided at a center of the second end thereof.

As shown in FIG. 2, a pair of circular partition plates 6 and 7 are fixedly arranged in the housing 2 in a state orthogonal to the longitudinal direction of the housing 2, and an inlet is provided near the first end of the housing 2. The side space 8 and the outlet side space 9 are formed near the second end. The exhaust gas introduction pipe 4 communicates with the inlet side space 8, and the exhaust pipe 5 communicates with the outlet side space 9.
The filter units 3 are fixed in parallel between the partition plates 6 and 7 at equal intervals.

The filter unit 3 comprises a cylindrical filter 10 formed of heat-resistant fiber in a cylindrical shape, and a heater 11 arranged along the inner surface of the cylindrical filter 10 as a heat source. For the cylindrical filter 10, for example, a cylindrical woven fabric woven using a three-dimensional loom previously proposed by the applicant of the present application (JP-A-2-221440) is used. Ceramic fibers such as silicon carbide fibers, alumina fibers, and tyranno fibers (trade name, manufactured by Ube Industries, Ltd.) are used as the heat resistant fibers. The yarn used in the fabric is composed of a large number of heat resistant fibers. The cylindrical woven fabric does not need to be a three-dimensional woven fabric, and may be a single layer woven fabric having a flat structure.

As the heater 11, a Kanthal wire (a Fe, Cr, Al alloy, trade name of Kanthal Gadelius Co., Ltd.) having excellent high temperature durability is used. The heater 11 is a cylindrical filter 10
Is formed in a spiral shape having a diameter slightly smaller than the inner diameter of the.

In order to guide the exhaust gas introduced into the inlet side space 8 to the inside of each filter unit 3, the partition plate 6 on the inlet side space 8 side has a through hole 6 smaller than the inner diameter of the cylindrical filter 10.
a is formed at a position corresponding to each filter unit 3. Further, both partition plates 6, 6 are provided on the partition plate 7 on the outlet side space 9 side.
A through hole 7a is formed for communicating the space partitioned by 7 with the outlet side space 9. The partition plate 7 is provided with a fitting protrusion 7b that also serves as a closing member that closes the second end of the filter unit 3 and a fixing member for the heater 11.

A cylindrical fixing member 12 is fitted and fixed to the first end of the cylindrical filter 10. Filter unit 3
The fixing metal fitting 12 is fitted and fixed in the through hole 6a, and is fixed between the partition plates 6 and 7 in a state where the second end of the tubular filter 10 is fitted in the fitting projection 7b. A through hole is formed in the fitting protrusion 7b and the fixture 12, and the end of the heater 11 is connected to the electric wire 15 by a screw 13 inserted into the through hole and a nut 14 screwed to the screw 13. In this state, it is fixed to the fixture 12 and the fitting projection 9b. The screw 13 is inserted into the through hole via the insulators 16a and 16b, so that the fixing fitting 12 and the fitting projection 7b cannot be energized. The electric wire 15 is drawn out of the housing from the outlet side of the housing 2 and is connected to the battery 19 via the heater relay 18. The heater relay 18 is controlled to open / close by the controller 20.
The heater 11 is energized when is closed.

Side wall 2a of the housing 2 on the inlet side space 8 side
An actuator 21 is attached at a position facing each filter unit 3. A pneumatic cylinder is used for the actuator 21, and a lid 22 for opening and closing the opening 3a of the filter unit 3 is fixed to the tip of a piston rod 21a protruding into the inlet side space 8. The actuator 21 is connected to the vacuum pump 23 via a pipe line 24, and a direction switching valve 25 is provided in the middle of the pipe line 24. The directional control valve 25 is electrically connected to the controller 20 so that the pipeline 24 connected to each actuator 21 is switched between a state in which it communicates with the vacuum pump 23 and a state in which it communicates with the atmosphere according to a command from the controller 20. Has become. A pressure sensor 26 for detecting the pressure of the exhaust gas introduced is attached to the exhaust gas introduction pipe 4. The pressure sensor 26 is electrically connected to the controller 20. The controller 20 has a pressure sensor 26.
The operation of the actuator 21 and the power supply timing to the heater 11 are controlled based on the detection signal from the.

As shown in FIG. 3, the actuator 21 is a single-acting cylinder in which the projecting operation (forward movement) of the piston rod 21a is performed with depressurized air and the returning movement is performed by the force of the spring 27. The actuator 21 has a conduit 24.
Is in communication with the vacuum pump 23, the lid 22
Is arranged at a position to close the opening 3a.
A speed controller 28 is connected to the conduit 24, and the speed controller 28 includes a check valve 28a and a throttle valve 28b. The check valve 28a is configured to prevent air from passing from the direction switching valve 25 toward the actuator 21 side.

Next, the operation of the exhaust gas filter 1 configured as described above will be described. The exhaust gas filter 1 is used by being connected in the middle of an exhaust pipe of a diesel engine. The exhaust gas introduced from the exhaust gas introducing pipe 4 into the inlet side space 8 is guided to the inside of each filter unit 3 through the opening 3a and passes through the tubular filter 10 from the inside to the outside. Then, while passing through the tubular filter 10, particulates and the like contained in the exhaust gas are filtered, and the cleaned exhaust gas is discharged from the exhaust pipe 5 through the outlet side space 9.

The particulates in the exhaust gas are collected by the cylindrical filter 10 by the inertial action and the diffusion action. The inertial action is the action that the aerosol adheres to the fiber due to the negative pressure due to the vortex flow that occurs when the aerosol collides with the fiber, and the diffusion action is the action that the flow velocity decreases when the aerosol collides with the fiber, and it accumulates on the surface of the fiber. . The cylindrical filter 10 has a large number of voids surrounded by three-dimensionally intersecting fibers, and while the exhaust gas passes through the cylindrical filter 10, particulates collide with the fibers to cause the inertia action and the diffusion action. It is captured and accumulated in the voids and the filtration performance is maintained for a long period of time.

The direction switching valve 25 is always held in a state in which the pipe line 24 connected to each actuator 21 is in communication with the atmosphere, and the lid 22 is arranged at a position where the opening 3a is opened. The pressure (back pressure) in the exhaust gas introducing pipe 4 rises as the amount of particulates collected by the tubular filter 10 increases. The filter unit 3 is regenerated when the back pressure reaches the combustion start set pressure.

The method of reproducing the filter unit 3 is roughly classified into the following two types. In the first method, all units are operated except during regeneration, and during regeneration, some units (usually one unit) are selected and the introduction of exhaust gas into the filter unit 3 is shut off. Burn particulates. After burning the particulates, exhaust gas is introduced into the filter unit 3 to return all the units to the operating state. In the second method, the inflow of exhaust gas into one unit is always shut off to put it in a dormant state, and the filter unit 3 is regenerated during this period. When it is time to regenerate the next filter unit 3, regeneration is completed by then.
Exhaust gas is introduced into the filter unit 3 that has been stopped, and the filter unit 3 is put into operation.

In this embodiment, the first method will be described, and the second method will be described in the second embodiment. The controller 20 detects the pressure in the exhaust gas introducing pipe 4 by the detection signal of the pressure sensor 26, and when the pressure in the exhaust gas introducing pipe 4 reaches the combustion start set pressure, selects one filter unit 3 and The filter unit 3 is regenerated, that is, the particulates are burned and removed. Since the back pressure rapidly increases during regeneration, the back pressure at the start of regeneration is set so that the back pressure after the increase does not hinder the operation of the engine.

At the time of regeneration, a control signal is output from the controller 20 to the directional control valve 25, and the pipe line 24 corresponding to the filter unit 3 is connected to the vacuum pump 2 first.
3 and the communication state. Then, the reduced pressure air is supplied to the actuator 21 via the conduit 24, and the piston rod 2
1a is operated against the force of the spring 27. The depressurized air is mainly the check valve 28a of the speed controller 28.
And is supplied to the actuator 21. Therefore,
The piston rod 21a is quickly moved, and the lid 22 is immediately placed at a position where it closes the opening 3a, and the introduction of exhaust gas into the filter unit 3 is blocked.

Next, the heater 11 of the filter unit 3 is energized to generate heat via the heater relay 18. And
Due to the heat generated by the heater 11, the particulates are heated to the combustion temperature and burned. The particulates deposited on the tubular filter 10 are first burned by the heat generated by the heater unit 11 and deposited on the inside of the tubular filter 10 near the heater unit 11. Thereafter, due to the heat generated by the heater unit 11 and the heat generated by the combustion of particulates, the fire is sequentially burned toward the outside of the cylindrical filter 10.

The closed state of the opening 3a by the lid 22 may be either a state in which the inflow of exhaust gas from the opening 3a is completely blocked or a state in which a small amount of exhaust gas flows.
Combustion proceeds relatively smoothly even when the inflow of exhaust gas from the opening 3a is completely blocked. Combustion proceeds even if oxygen necessary for combustion is not particularly supplied. It is said that unburned oxygen contained in exhaust gas (usually, exhaust gas contains about 5 to 16% oxygen). It is presumed that this is due to However, in order to promote the movement of heat inside the cylindrical filter 10 and to assist the burning of the accumulated particulates, it is preferable that a slight amount of exhaust gas be introduced.

After a lapse of a predetermined time (1 to 1.5 minutes) required for burning particulates, energization of the heater is stopped. Next, the directional control valve 25 is actuated by the actuation signal from the controller 20, the supply of depressurized air to the actuator 21 is stopped, and the conduit 24 is brought into communication with the atmosphere. Then, the piston rod 21a is retracted by the force of the spring 27, and the lid 22 is placed in the open position. When the conduit 24 is in communication with the atmosphere, the depressurized air supplied into the actuator 21 is released to the atmosphere via the conduit 24 and the speed controller 28.
The depressurized air causes the speed controller 28 to switch the direction switching valve 25.
When passing from the side to the actuator 21, the check valve 28a blocks the passage. Therefore, the depressurized air passes only through the throttle valve 28b, so that the air slowly flows into the actuator 21, and the piston rod 21a also slowly moves. That is, the lid 22 is slowly returned to the open position, and the inflow amount of the exhaust gas is gradually increased without flowing into the filter unit 3 at once. When the filter unit 3 after regeneration is brought into an operating state again, the back pressure is reduced and the output of the engine is secured. After that, when the back pressure rises again and the filter unit 3 needs to be regenerated, the next filter unit 3 is regenerated. This operation is repeated as long as the operation of the engine is continued.

When the lid 22 is arranged at the closed position, the exhaust gas passage for one filter unit is reduced, so that the back pressure temporarily increases rapidly. After the regeneration of the filter unit 3 is completed, when the exhaust gas is allowed to flow into the regenerated filter unit 3 with the lid 22 placed at the open position, a part of the exhaust gas passes through the filter unit 3 having a small passage resistance. Back pressure decreases as it passes. When the lid 22 is quickly opened as in the conventional case, most of the exhaust gas passes through the filter unit 3 having a small resistance, and the back pressure of the exhaust gas filter 1 as a whole is rapidly reduced. Therefore, the back pressure changes in the pattern shown in FIG.

However, according to the method of the present invention, the lid 22 is opened slowly, so that the exhaust gas gradually flows into the filter unit 3 and the back pressure of the entire filter slowly decreases. After the regeneration, the filter unit 3 which has returned to the operating state does not operate at full capacity immediately after the recovery, but gradually becomes full operation. That is, the operation rate of the filter unit 3 is gradually increased so as to compensate for the decrease in the processing capacity of the other filter units 3. Therefore, the back pressure changes in the pattern as shown in FIG. 4, and the fluctuation range of the back pressure becomes smaller than that in the case of FIG. As a result, the amount of change in engine output due to the change in back pressure is reduced, and the driving feeling is improved.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. In this embodiment, the exhaust gas filter 1
Is the same as that of the above-mentioned embodiment, but the method of regenerating the filter unit 3 is different from that of the above-mentioned embodiment. In this example,
The introduction of exhaust gas is always 6 out of 7 filter units 3.
This is performed for one of the filter units 3, and any one of the filter units 3 is kept in a state where the inflow of exhaust gas is blocked, that is, in a rest state. Then, the filter unit 3 is subjected to the regeneration process while in the idle state.

When the pressure in the exhaust gas introducing pipe 4 reaches the combustion start set pressure, after the regeneration is completed, the controller 20 outputs an operation signal to the directional switching valve 25 corresponding to the filter unit 3 which is in the idle state. And the directional control valve 25
Is switched to a position where the pipe line 24 is kept in communication with the atmosphere, and the lid 22 that has closed the opening 3a of the filter unit 3 is slowly placed in the open position.

On the other hand, the directional switching valve 25 corresponding to one filter unit 3 which has been in the operating state until then is operated, and the pipe line 24 corresponding to the filter unit 3 is brought into communication with the vacuum pump 23. Then, the lid 22 is immediately placed in the closed position, and the filter unit 3 is in a rest state in which the inflow of exhaust gas is blocked. Next, the heater 11 of the filter unit 3 is energized and heated for a predetermined time, and the particulates are burned. Even after the particulates have been burned, the lid 22 is kept in the closed position until the next regeneration time of another filter unit 3. After that, when the back pressure again rises to the predetermined pressure, the filter unit 3 in the rest state is put into operation, and the next filter unit 3 is regenerated.

That is, in this embodiment, when the back pressure reaches the combustion start set pressure, one of the filter units 3 which has been in the operating state until then replaces the exhaust gas treatment with the filter unit 3 after the regeneration is completed. Therefore, unlike the above-mentioned embodiment, the back pressure does not rise when the filter unit 3 is regenerated, and only the back pressure decreases. Then, since the lid 22 is slowly opened, the exhaust gas gradually flows into the filter unit 3, and the back pressure of the entire filter slowly decreases. That is, the filter unit 3 that has returned to the operating state after the regeneration does not operate at full capacity immediately after the restoration,
Gradually become full operation. Therefore, the back pressure changes in the pattern shown in FIG. That is, the fluctuation range of the back pressure is smaller than that in the above-described embodiment, and the driving feeling is also improved. If you open the lid 22 quickly,
Back pressure drops sharply. Therefore, the back pressure changes in the pattern shown in FIG.

The present invention is not limited to the above-mentioned embodiment. For example, when the actuator 21 is operated,
As a means for controlling the moving speed of the piston rod 21a, instead of using the speed controller 28, a damper 29 may be provided between the lid 22 and the actuator 21 in parallel with the piston rod 21a as shown in FIG. In this case, not only when the lid 22 is placed in the open position, but also when the lid 22 is placed in the closed position.
The moving speed of 1a becomes slow. Therefore, when applied to the first embodiment, the back pressure decreasing speed after regeneration is almost the same, and the back pressure increasing speed at the start of regeneration is slow. Therefore, the driving feeling becomes better. The same effect can be obtained by providing only the throttle valve instead of the speed controller 28 between the actuator 21 and the direction switching valve 25.

Further, as the actuator 21, a double-acting cylinder which is operated by depressurized air for both reciprocating motion is used instead of the single-acting cylinder, and other actuators such as a hydraulic cylinder and a solenoid are used instead of the pneumatic cylinder. May be. However, when the exhaust gas filter is used for an automobile, a pneumatic cylinder is preferable from the viewpoint of heat resistance. When using a pneumatic cylinder, it may be configured to operate with compressed air instead of depressurized air.

Further, when the lid 22 is moved from the closed position to the open position, the movement does not necessarily have to be continuously moved, and if the exhaust gas gradually flows into the filter unit 3, its opening degree is gradually increased. It may be increased.

Further, instead of setting the regeneration timing of the filter unit 3 based only on the back pressure, it may be set based on a state in which exhaust gas temperature, engine speed, etc., and back pressure are combined.

Further, the cylindrical filter 10 is not limited to a cylindrical woven fabric, and in addition to an annular woven fabric, a braid, etc., a general flat woven fabric is formed into a tubular shape, or a laminate of them is combined with a nonwoven fabric. Various configurations can be adopted.
In addition, the cylindrical filter 10 and the heater 11 are not separately provided, but a ceramic fiber and a heater are provided in a plurality of layers on the outer peripheral surface of the air-permeable support material as in the device described in JP-A-2-256812. It is also possible to adopt a structure wound around the. Further, the heater 11 may not have a spiral shape but may have a plurality of linear shapes arranged in parallel.
Further, the filter unit 3 is not limited to the tubular shape, and may be configured by a flat plate filter. Furthermore, the exhaust gas filter may be used not only for a diesel engine of an automobile but also for a diesel engine for power generation.

[0041]

As described in detail above, according to the present invention, when the filter unit constituting the exhaust gas filter is regenerated, the change in the back pressure of the entire exhaust gas filter before and after the regeneration is reduced and the operation feeling is improved. Become.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an exhaust gas filter of a first embodiment embodying the present invention.

FIG. 2 is a partial cross-sectional view of an exhaust gas filter.

FIG. 3 is a schematic diagram showing a relationship between an actuator and speed control means.

FIG. 4 is a graph showing changes in back pressure when exhaust gas treatment and filter unit regeneration are repeated.

FIG. 5 is a graph showing changes in back pressure when exhaust gas treatment and filter unit regeneration are repeated in a comparative example.

FIG. 6 is a graph showing changes in back pressure when exhaust gas treatment and filter unit regeneration of the second embodiment are repeated.

FIG. 7 is a graph showing changes in back pressure when exhaust gas treatment and filter unit regeneration are repeated in a comparative example.

FIG. 8 is a schematic diagram showing a relationship between an actuator and a speed control means of a modified example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Exhaust gas filter, 3 ... Filter unit, 10 ... Cylindrical filter, 11 ... Heater as a heat source, 21 ... Actuator, 22 ... Lid, 28 ... Speed controller 2
8, 28a ... Check valve, 28b ... Throttle valve, 29 ... Damper.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Matsuura 2-chome, Toyota-cho, Kariya-shi, Aichi Stock company Toyota Industries Corporation (72) Inventor Yoshiharu Yasui 2-chome, Toyota-cho, Kariya-shi, Aichi Stock Company Toyota Loom Works

Claims (2)

[Claims] 1. An exhaust gas filter for a diesel engine, wherein a plurality of filter units each having a heat source for regeneration are provided in parallel, and the filter units are regenerated by sequentially burning and removing deposits for each filter unit, Diesel that gradually burns the exhaust gas into the filter unit after the deposit is burned by heating the heat source in a state where the flow of the exhaust gas into the filter unit is substantially cut off when the filter unit is regenerated. Regeneration method of engine exhaust gas filter. 2. The diesel engine according to claim 1, wherein when the exhaust gas is substantially blocked from flowing into the filter unit to be regenerated, the exhaust gas is introduced into the filter unit so as to be gradually reduced. Exhaust gas filter regeneration method.