JP2591562Y2 - Particulate trap device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particulate trap device for trapping and removing fine particles contained in exhaust gas of a diesel engine.

[0002]

2. Description of the Related Art There is a particulate trap device in which a plurality of filters for collecting fine particles (particulates) in exhaust gas are installed in an exhaust passage of a diesel engine, and a backwash nozzle is provided downstream of each filter.

[0003] This device has a combustion chamber below the filter, and during regeneration of the filter, closes a valve downstream of the filter so as to prevent exhaust gas from flowing through the filter.
The high-pressure air is blown out of the backwash nozzle to blow the trapped particulates down from the corresponding filter into the combustion chamber, and the combustion in the combustion chamber removes the burned particulates. (Japanese Unexamined Patent Publication No. 2-188613, No. 18609, and 4-10
No. 9020).

[0004]

However, in such a conventional apparatus, since the air in the air reservoir is used for the high-pressure air for backwashing, the filter that is to be regenerated later is blown out from the backwashing nozzle. As the pressure of the air decreases, the regeneration efficiency decreases, and the regeneration is not performed evenly.

The purpose of the present invention is to solve such a problem.

[0006]

In Means for Solving the Problems A first invention is provided with a plurality of filters 1 and 2 for trapping particulates that in exhaust in an exhaust passage of the engine, as shown by FIG 1 in parallel, regeneration timing To these filters 1 and 2 from the downstream side
By blowing high-pressure air from the turn air reservoir 5 via the backwashing nozzles 3,4, blown down collected particulate filter 1 in the combustion chamber in this backwash air,
In the particulate trap device in which the particulates are reburned in the combustion chamber , the backwashing process is performed as one cycle of the regeneration process each time the regeneration time comes.
Initially, for a plurality of filters 1 and 2 ,
Each time the backwash air is blown out for a predetermined time,
The rest is to wait for the air pressure in the air reservoir 5 to recover.
When the specified time t ₂ has elapsed, each again at the beginning and reverse order
Prevents backwash air from being blown out to filters 1 and 2 respectively
There is provided a control means 6 for performing only for a time . In the second idea
Is the air pressure inside the air reservoir 5 in the first invention.
There prescribed time t ₂ to wait for the recovery, 1 cycle
Set to about 300 seconds since the start of playback
Set.

[0007]

[Function] When the filter regeneration time comes, one cycle
Raw processing is performed. For backwashing of each filter,
Initially, backwash air is applied for a specified time in a specified order.
The air is blown out and the air pressure in the air reservoir is
When the prescribed time t ₂ to wait for the recovery has elapsed, the
Blow back air to each filter again in reverse order
Each operation is performed for a predetermined time. Filter collection
Particulates are collected by backwash air from the air reservoir.
And is blown down into the combustion chamber.
During the raw treatment, the fuel is reburned in the combustion chamber. this
In the case of a one-cycle regeneration process,
Filter that management is later carried out, after the lapse of the prescribed time t _2,
This time, since the backwashing process is performed first,
In the amount of trapped particulates blown off (removal rate)
There is no occurrence of noise , and each filter can be accurately reproduced.

[0008]

FIG. 2 shows an embodiment of the present invention. Reference numeral 10 denotes a trap body installed in an exhaust passage of a diesel engine.

In the trap body 10, the flow path in the body 10 is divided into two systems, and filters 11 and 12 for trapping particulates are interposed in the respective flow paths.

The flow paths 13 downstream of the filters 11
14, shutter valves 15 and 16 are interposed, respectively.

[0011] The shutter valves 15 and 16 are
When the air is sent from the air reservoir 19 when the air valves 7 and 18 are opened, the flow paths 13 and 14 are closed. When the electromagnetic valves 17 and 18 are closed and the air is shut off, the flow paths 13 and 14 are opened. .

Filters 11 and 12 are provided in the trap body 10.
A combustion chamber 20 is formed below the heater, and a heater 21 is installed in the combustion chamber 20.

On the downstream side of the filters 11 and 12 of the trap body 10, backwash nozzles 22 and 23 are provided, respectively.

High pressure air from an air reservoir 19 is sent to the backwash nozzles 22 and 23 via solenoid valves 24 and 25, respectively, and when the solenoid valves 24 and 25 are opened, the high pressure air is directed to the filters 11 and 12. It is designed to blow out.

A filter regeneration request is periodically issued by the controller 26, and the solenoid valves 17, 18, 24, 2
5. The heater 21 is controlled. 27 indicates a battery.

The air reservoir 19 is connected to a compressor of the engine (not shown), and is connected to the air reservoir 19.
When the internal pressure drops to a reference value, air is replenished by the compressor until a predetermined high pressure is reached.

Next, the contents of control by the controller 26 will be described with reference to the flowchart of FIG. 3 and the timing chart of FIG.

When a filter regeneration request is generated, the process starts. First, the flag is set to 0 (initial value).
1 (first block) is reproduced (steps 1 to 3).
Step 2 may be omitted.

To regenerate the filter 11, the shutter valve 15 in the flow path 13 is closed and the solenoid valve 24 is opened for a very short time. As a result, the high-pressure air in the air reservoir 19 is flushed with the backwash nozzle 2.
2 is blown out toward the filter 11, and the trapped particulates of the filter 11 are blown down into the combustion chamber 20.

After closing the solenoid valve 24, the shutter valve 15 is opened. The particulates dropped into the combustion chamber 20 are the heater 2
Incinerate by 1.

A specified time t3 (for example, 10
(Seconds), the filter 12 (second block) is reproduced (steps 4 and 5).

To regenerate the filter 12, the shutter valve 16 of the flow path 14 is closed,
Open 5 for a very short time. Thereby, the high-pressure air in the air reservoir 19 is blown out from the backwash nozzle 23 toward the filter 12, and the trapped particulates of the filter 12 are blown down into the combustion chamber 20.

After closing the solenoid valve 24, the shutter valve 16 is opened. The particulates dropped into the combustion chamber 20 are the heater 2
Incinerate by 1.

When the filters 11 and 12 are reproduced, a flag = 1 is set (step 6).

Next, according to the flag = 1, when a specified time t2 (for example, 300 seconds) has elapsed from the start, the filter 12 (second block) is reproduced (step 1 →).
7, 8).

The regeneration of the filter 12 is performed in the same manner as described above. The particulates falling into the combustion chamber 20 are the heater 21
By incineration.

A specified time t4 from the start (for example, 310
(Seconds), the filter 11 (first block) is reproduced (steps 9 and 10).

The regeneration of the filter 11 is performed in the same manner as described above. The particulates falling into the combustion chamber 20 are the heater 21
By incineration.

When the filters 11 and 12 are reproduced, a flag = 0 is set (step 11).

Since the filters 11 and 12 are thus reproduced, the filters 11 and 12 can be reproduced equally.

That is, as the regeneration is performed, the pressure of the high-pressure air in the air reservoir 19 that blows out to the filter decreases, but the filter that has performed the regeneration first performs the regeneration next, and then performs the regeneration later. The filter performs reproduction next, so that the reproduction of the filters 11 and 12 can be performed accurately without bias.

Therefore, the load is not biased to one of the filters 11 and 12 due to the difference in the regeneration efficiency, and the durability of the system can be improved, and the regeneration efficiency of the entire system can be improved. And high reliability can be ensured.

[0033]

As described above, in the first invention , the particulates in the exhaust gas are collected in the exhaust passage of the engine.
A plurality of filters are provided in parallel , and at the time of regeneration, high-pressure air from an air reservoir is sequentially blown from the downstream side to these filters through a backwash nozzle to thereby provide the backwash air.
Blow down the collected particulates of the filter into the combustion chamber, and re-burn the particulates in the combustion chamber.
In the particulate trap apparatus, the backwashing process is performed as one cycle of regeneration process every time the regeneration time comes.
For multiple filters, initially in a predetermined order.
The backwash air is blown out for a predetermined time, and then
Is a provision for waiting for the air pressure in the air reservoir to recover
When the time t ₂ has elapsed, each again in the order beginning with the reverse Fi
Blowing backwash air into the filter
Is provided with the Hodokosuru control means, in each filter can play accurately, can improve the durability of the system, it is possible to ensure a high filter performance, and reliability is improved. Second invention
Then, in the first invention, the air pressure inside the air reservoir
There prescribed time t ₂ to wait for the recovery, 1 cycle
Set to about 300 seconds since the start of playback
The starting conditions are the same as for the first backwashing process and air pressure.
Depending on the case, a later backwashing process can be performed. Also, re-filter
The specified time t ₂ using a timer for managing the raw processing time
Can also be counted.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the invention.

FIG. 2 is a configuration diagram of an embodiment.

FIG. 3 is a flowchart showing control contents.

FIG. 4 is a control timing chart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Trap main body 11, 12 Filter 15, 16 Shutter valve 17, 18 Solenoid valve 19 Air reservoir 20 Combustion chamber 21 Heater 22, 23 Backwash nozzle 24, 25 Solenoid valve 26 Controller

Claims (2)

(57) [Scope of request for utility model registration] 1. A plurality of filters for collecting particulates in exhaust gas are provided in parallel in an exhaust passage of an engine, and a backwash nozzle is provided to these filters from a downstream side thereof at the time of regeneration.
The high pressure air from the air reservoir in turn through
With this backwash air, the trapped particulates of the filter are blown down into the combustion chamber, and the particulates are collected in the combustion chamber.
In a particulate trap device that re-burns fuel , one cycle of regeneration processing and
For the backwash process,
First, blow backwash air in the specified order for the specified time.
And then the air pressure in the air reservoir recovers.
When the prescribed time t ₂ has elapsed to wait for that, beginning and
Blow backwash air to each filter again in reverse order.
A particulate trap device comprising a control means for performing the control only for a predetermined time . 2. The method according to claim 1, wherein the air pressure inside the air reservoir is recovered.
Specified time t to wait ₂ Is the start time of one cycle of playback
It is noted that the elapsed time from
The particulate trap device according to claim 1, wherein
Place.