JP2598817Y2 - 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 later regenerated is blown out from the backwashing nozzle. The pressure of the air decreases, and the regeneration efficiency decreases.

[0005] The air reservoir stores air sent from the compressor, but the compressor is activated only when the pressure in the air reservoir drops to a lower limit set value.

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

[0007]

According to the present invention, a plurality of filters for collecting particulates contained in exhaust gas of an engine are provided, and high-pressure air from an air reservoir is blown out from a backwash nozzle to remove the filters. of by dropping blowing collecting particulates in particulate trap system for re <br/> producing each filter sequentially respectively, Airy
Keep the reservoir tank pressure between the upper and lower limits.
A pressure governor starting solenoid valve is installed in the signal pressure line to the pressure governor that controls the operation of the compressor ,
Plexes immediately after the end of the backwash process of the filter to be reproduced first
Reduce the signal pressure to the shagavana below the tank pressure lower limit.
To operate the pressure governor starting solenoid valve at the specified operation.
Means to drive only for a while and backwash of the filter regenerated earlier
Predetermined interval time elapses immediately after processing ends
Wait for the next filter to be regenerated
Means for causing

[0008]

[Action] At the time of filter regeneration, reproduction order is blown out of the high-pressure air to the previous filter, blowing the collection Patekyureto of its
The pressure governor starts immediately after this playback.
The solenoid valve is driven. Therefore, the earlier filter
Immediately after regeneration, the tank pressure of the air reservoir is
Pressure governor-activated solenoid valve
Signal pressure to the pressure governor falls below the lower limit.
The compressor is forced to start and the air
Continue discharging until the reservoir tank pressure reaches the upper limit.
Continue.

[0009] By driving the compressor , the tank pressure of the air reservoir is increased, and a predetermined interval time is maintained .
After lapse, since the predetermined high-pressure air is blown even to the reproduction order is the filtered, regardless of the order of reproduction, each fill
High regeneration efficiency.

[0010]

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 on the downstream side of the filters 11 and 12
14, shutter valves 15 and 16 are interposed, respectively.

The shutter valves 15 and 16 are provided by the solenoid valve 1.
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. .

The trap body 10 includes filters 11 and 12.
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 the 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.

The air supplied from the compressor 26 of the engine via the air dryer 27 is stored in the air reservoir 19, and the air reservoir 1 is stored in the air reservoir 1 via a signal pressure line 28.
9 is the pressure governor 2 for compressor control
It is led to 9.

A pressure governor activation solenoid valve 30 capable of releasing the signal pressure to the pressure governor 29 is provided in the middle of the signal pressure line 28.

When the pressure governor activation solenoid valve 30 is in a non-operating state, the pressure in the air reservoir 19 is guided to the pressure governor 29, and when the pressure becomes equal to or lower than the lower limit set value, the pressure governor 29 operates to operate the compressor 2.
6 is activated, and air is supplied to the air reservoir 19.

When the pressure governor activation solenoid valve 30 is driven, the signal pressure to the pressure governor 29 is released,
The air is replenished to the air reservoir 19 by forcibly starting the compressor 26.

Once the compressor 26 has been started,
The drive is continued until the pressure guided to the pressure governor 29 reaches a predetermined upper limit.

The controller 31 issues a filter regeneration request at a predetermined time based on engine operating conditions and the like, and controls the solenoid valves 17, 18, 24, and 25, the heater 21, and the pressure governor-activated solenoid valve 30. 32
Indicates a battery.

Next, the contents of control by the controller 31 will be described with reference to the flowchart of FIG.

When a filter regeneration request is issued, first, the filter 11 (first block) is regenerated (step 1).

The regeneration of the filter 11 is performed by closing the shutter valve 15 of the flow path 13, opening the solenoid valve 24, sending high-pressure air from the air reservoir 19 to the backwash nozzle 22, and blowing the collected air toward the filter 11 to collect the air. The particulates are blown down into the combustion chamber 20. The solenoid valve 24 is driven to open for a very short time so as to blow out high-pressure air in a pulsed manner, and then driven to close. The particulates falling into the combustion chamber 20 are incinerated by the heater 21.

When the regeneration of the filter 11 is completed, the shutter valve 15 is opened. In this case, the driving of the shutter valve 15 is terminated, and at the same time, the pressure governor activation solenoid valve 3 is opened.
0 ON (driven) to open the signal pressure to the pressure governor 29, and is turned off after a predetermined operating time _{t 1} (e.g. 1 second) (Step 2-4). Thereby, the compressor 2
Force start.

Immediately after the end of the reproduction of the filter 11,
After a predetermined interval time t ₂ (for example, 60 seconds), the filter 12 (second block) is reproduced ( step 5).
→ 6 ).

In the regeneration of the filter 12, the shutter valve 16 of the flow path 14 is closed as in the filter 11,
By opening the solenoid valve 25 and sending high-pressure air from the air reservoir 19 to the backwash nozzle 23 and blowing it out toward the filter 12, the trapped particulates are blown down into the combustion chamber 20. The solenoid valve 25 is driven to open for a very short time so as to blow out high-pressure air in a pulsed manner, and then driven to close. The particulates falling into the combustion chamber 20 are incinerated by the heater 21.

When the regeneration of the filter 12 is completed, the shutter valve 16 is opened and the process is completed.

[0030] Thus when reproducing the filters 11 and 12, reproduction is blown a high pressure air to the previous filter 11, its
And blows off the trapped particulates
Immediately thereafter, the pressure governor activation electromagnetic valve 30 is driven.
Immediately after the regeneration of the filter 11, the air reservoir 1
9 when the tank pressure is not below the lower limit.
The operation of the governor activation solenoid valve 30 causes the pressure governor
29, the signal pressure to 29 drops below the lower limit.
The server 26 is forcibly activated.

For this reason, air is replenished from the compressor 26 to increase the pressure in the air reservoir 19, and when the high-pressure air is blown to the filter 12 after regeneration, the pressure in the air reservoir 19 is maintained at a predetermined high pressure. .

As a result, it is possible to prevent a decrease in the regeneration efficiency of the filter 12 in which the regeneration is performed later, and to ensure a high regeneration efficiency equivalent to that of the filter 11 in which the regeneration is performed first.

The compressor 26 is connected to the filter 12
Is stopped when the pressure in the air reservoir 19 reaches a predetermined upper limit after the regeneration of.

[0034]

As described above, according to the present invention, a plurality of filters for collecting particulates contained in the exhaust gas of the engine are provided, and high-pressure air from the air reservoir is blown out from the backwash nozzle to remove the filters. In the particulate trap device that sequentially regenerates each filter by blowing down the trapped particulates, the air reservoir
To keep the tank pressure between the upper and lower limits.
It established the pressure governor start solenoid valve signal <br/> No. pressure line to the pressure governor which controls the operation of the compressor, above
Puresshi immediately after the end of the backwash process of the filter to be reproduced
Reduce the signal pressure to the gabana below the lower limit of tank pressure.
Make sure the pressure governor start solenoid valve is in the specified operating time
Only driving means and backwashing of the filter regenerated earlier
The predetermined interval time elapses immediately after
Wait for the next filter to be regenerated
Means, high reproduction efficiency of each filter can be ensured regardless of the order of reproduction.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an embodiment of the present invention.

FIG. 2 is a flowchart for explaining control contents.

Claims (1)

(57) [Scope of request for utility model registration] 1. A provided with a plurality of filters for collecting particulates contained in exhaust gas of the engine, the high pressure air from the air reservoir from the backwash nozzle blowout, by dropping blown collected particulate filters, each filter In the particulate trap device that sequentially regenerates the air reservoir , the tank pressure of the air reservoir is adjusted to the upper limit and the lower limit.
Control the compressor operation to maintain the
A pressure governor activation solenoid valve is installed in the signal pressure line to the pressure governor to backwash the filter that is regenerated first.
Immediately after processing is completed , the signal pressure to the pressure governor is stored in the tank.
Pressure governor so that the pressure is reduced below the lower pressure limit.
And means for driving the dynamic electromagnetic valve for a predetermined operating time, re previously
Immediately after the backwashing process of the filter
Wait for the expiration of the tarball time before playing the next file.
Means for initiating a backwashing process of ruther.