JP2598533Y2 - 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 from the backwash nozzle, and the trapped particulates are blown down from the corresponding filter into the combustion chamber, and are burned and removed by the heater in the combustion chamber. Each filter is regenerated at a predetermined time. (Japanese Unexamined Patent Application Publication No. Hei 2-188613, No. 3-18609, and 4-1090)
No. 20, etc.).

[0004]

However, in such a conventional apparatus, since the air in the air reservoir mounted on the vehicle is used for the high-pressure air for backwashing, when the pressure in the air reservoir is low, The pressure of the air from the backwash nozzle drops and the regeneration efficiency of the filter decreases. Therefore, check that the pressure is higher than the specified value.
And control to blow out the air.
-26027).

[0005] In this case, when the operation is performed, air in the air reservoir is replenished by the compressor and the pressure gradually increases. However, if the pressure is sufficiently increased from the time of requesting regeneration, the accumulation of particulates may occur. The number of filters increases, making it difficult to regenerate the filter.

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

[0007]

According to a first aspect of the present invention, there is provided a plurality of filters for collecting particulates contained in exhaust gas of an engine, and a plurality of filters are provided from the downstream side toward the filters. > high-pressure air balloon and by dropping blow collected particulates from the air reservoir, each filter it
In a particulate trap device that sequentially regenerates, a pressure detecting means for detecting the pressure in the air reservoir, and at a predetermined time for regenerating the filter, blows out high-pressure air when the pressure in the air reservoir is equal to or higher than a specified value. A control means is provided, and a specified value for blowing out high-pressure air from the air reservoir is set lower than that of the filter that has been performed earlier, for the filter that is to be regenerated later.

[0008] The second device is included in the exhaust of the engine.
A a plurality of filters for collecting particulates that,
By dropping blow balloons with collecting particulates high pressure air from the air reservoir toward these downstream filter, the particulate trap device for reproducing each filter sequentially respectively, the pressure that detects the pressure in the air reservoir Detecting means and at a predetermined time for regenerating the filter, perform high-pressure air blowing when the pressure in the air reservoir is equal to or higher than a predetermined value, and wait for a predetermined time when the pressure in the air reservoir is lower than a predetermined value. Ru provided a control means for performing balloon of high pressure air.

According to a third aspect of the present invention, in the second aspect of the present invention, a specified value for blowing out high-pressure air from an air reservoir is set to be lower than that of a filter which has been previously used.

[0010]

According to the first invention, when the filter is regenerated, the air is removed.
When high pressure air is blown when the pressure in the reservoir is
As a result, the filter can be efficiently regenerated. Also air
The specified value for blowing high-pressure air from the reservoir is
Each filter is successively delayed because it becomes lower on the later filter side
And it can be played continuously .

In the second invention, the pressure in the air reservoir is increased.
Even if it is lower than the specified value, if a predetermined time elapses,
Since air blowing starts, it is driven by the engine
Operation with small compressor discharge
Even at times, the amount of trapped filter may become excessive.
Can be effectively prevented . The third device is based on the second device.
In addition to the effect, when blowing high pressure air from the air reservoir
Because the specified value of becomes lower on the filter side after regeneration,
Filters can be successively reproduced without delay .

FIG. 1 is a schematic diagram for explaining an embodiment of the present invention .
Yes, 1 and 2 are particles contained in the exhaust of the engine
It is a filter that collects the rate.
Means 5 for controlling the production is provided. Re-filter 1 and 2
Raw water is supplied to the air reservoirs sequentially from the downstream side.
Blow-out high-pressure air from bag 3 to collect particulates
It is performed by blowing down. In air reservoir 3
A pressure detecting means for detecting pressure;
At the predetermined time to regenerate filters 1 and 2
High pressure air blowing when the pressure in the chamber 3 is higher than the specified value
(Backwash treatment) .

[0013] Specifically, in FIG. 2, 10 track
Main body, which is installed in the exhaust passage of a diesel engine.
It is .

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 the solenoid valves 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. .

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 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 reservoir 19 includes an air reservoir 19.
A pressure sensor 26 for detecting the internal pressure is provided, and a detection signal thereof is input to a controller 27 together with a detection signal from an engine operating condition detecting means (not shown).

The controller 27 issues a request for regeneration of the filters 11 and 12 at a predetermined time based on the operating conditions of the engine.
, 18, 24, 25 based on the detection signal of
The heater 21 is controlled. Reference numeral 28 denotes a battery.

The air reservoir 19 is connected to a compressor (not shown) of the engine.
When the internal pressure becomes equal to or lower than a predetermined value, air is replenished by the compressor until the internal pressure reaches a predetermined high pressure.

Next, the contents of control by the controller 27 will be described with reference to the flowchart of FIG.

When a filter regeneration request is issued, the pressure P in the air reservoir 19 is compared with a specified value P ₀ in step 1, and if the pressure P is higher than the specified value P ₀ , step 3
, The filter 11 on one side is reproduced.

If the pressure P is lower than the specified value P ₀ , the time is counted in step 2. During this standby, the pressure P
Is higher than the specified value P ₀ , and if a predetermined time (for example, one minute) has elapsed, the process proceeds to step 3, and the filter 11 on one side is regenerated.

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 air toward the filter 11 to collect the air. The particulates are blown down into the combustion chamber 20. In this case, the solenoid valve 24
Is driven to open for a very short time so that high-pressure air is blown out in a pulse, and then closed again. The particulates falling into the combustion chamber 20 are incinerated by the heater 21.

After the regeneration of the filter 11, the shutter valve 15 is opened.

Thereafter, after a lapse of a predetermined time (for example, 10 seconds), the pressure P in the air reservoir 19 is compared with a specified value P ₀ in a step 5. If the pressure P is higher than the specified value P ₀ , a step 7 is performed. The filter 12 on the other side is reproduced.

If the pressure P is lower than the specified value P ₀ , the time is counted in step 6. During this standby, the pressure P
Is higher than the specified value P ₀ , and if a predetermined time (for example, 0.5 minutes) has elapsed, the process proceeds to step 7 and the filter 12 on the other side is reproduced.

The regeneration of the filter 12 is performed by closing the shutter valve 16 of the flow path 14 in the same manner as 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 closed again. Combustion chamber 2
The particulates falling to 0 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.

When the filters 11 and 12 are regenerated as described above, when the pressure in the air reservoir 19 is equal to or higher than a specified value,
By blowing high pressure air from the backwash nozzles 22 and 23,
The collection particulates can be quickly dropped from the filters 11 and 12, and the filters 11 and 12 can be efficiently and satisfactorily reproduced.

On the other hand, if the pressure in the air reservoir 19 is lower than the specified value, the compressor enters the regeneration mode after waiting for the compressor to increase the pressure in the air reservoir 19 or after a predetermined time has passed, and the backwash nozzle 22, 23
Since high-pressure air is blown out from the filter, the particulates do not accumulate excessively on the filters 11 and 12, and the particulates can be sufficiently dropped from the filters 11 and 12 by the high-pressure air, so that the filter can be properly regenerated.

In this case, since the pressure in the air reservoir 19 does not drop too much due to the blowing of the high-pressure air, the air pressure used for each part of the vehicle can be maintained at a predetermined pressure.

In the embodiment, the specified value for blowing out the high-pressure air from the air reservoir 19 is the same for the filters 11 and 12. However, the specified value can be set lower on the filter 12 side after the regeneration.

In the case where the filters 11 and 12 are regenerated almost continuously, if the specified value on the subsequent filter 12 side is reduced, the reproduction is delayed and it is not difficult to blow down the particulates.

[0037]

According to the first invention, during the exhaust of the engine,
A plurality of filters for collecting particulates contained in the provided by dropping blowing collecting particulates blows high pressure air from Eariza <br/> over bar toward these downstream filter, each filter Each sequentially
In the particulate trap apparatus for regenerating the filter, pressure detecting means for detecting the pressure in the air reservoir, and control means for blowing high-pressure air when the pressure in the air reservoir is equal to or higher than a prescribed value at a predetermined time for regenerating the filter. provided with, for the filter to become later playback, the specified value when blowing high-pressure air from the air reservoir, so set lower than the filter previously performed, the specified value or more high
The filter can be efficiently regenerated by blowing compressed air.
At the same time, the specified value becomes lower on the filter side after regeneration.
Therefore, it is possible to regenerate each filter sequentially without delay.
You .

According to the second invention, during the exhaust of the engine ,
A plurality of filters for collecting particulates contained provided, by dropping blow balloons with collecting particulates high pressure air from Eariza <br/> bar toward these downstream filter, each filter respectively In a particulate trap device that sequentially regenerates, a pressure detecting means for detecting the pressure in the air reservoir, and at a predetermined time when the filter is regenerated, when the pressure in the air reservoir is equal to or higher than a specified value, the high pressure air is discharged. While performing the blowing, when the pressure in the air reservoir is lower than the specified value , the control means for blowing out the high-pressure air after the elapse of a predetermined time is provided , so even if the pressure in the air reservoir is lower than the specified value,
After waiting for a predetermined time, the blowing of high-pressure air starts.
This means that even during idling,
It is possible to effectively prevent the amount of collected data from becoming excessive . Third
According to invention, in the second invention, the filter comprising after regeneration, the specified value when blowing high-pressure air from the air reservoir, so set lower than the filter previously performed sequentially without delay each filter It can be played continuously
You .

[0039]

[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.

[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 Pressure sensor 27 Controller

Claims (3)

(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, to blow down the balloon by collecting particulates high pressure air from the air reservoir toward these downstream filter Yo
In a particulate trap device that sequentially regenerates each filter, a pressure detecting means for detecting the pressure in the air reservoir and a high pressure when the pressure in the air reservoir is equal to or higher than a specified value at a predetermined time for regenerating the filter. A particulate trap provided with control means for blowing out air, wherein a specified value for blowing out high-pressure air from an air reservoir is set lower than that of a filter performed earlier for a filter to be reproduced later. apparatus. Wherein a plurality of filters for collecting particulates contained in exhaust gas of the engine, to blow down the balloon by collecting particulates high pressure air from the air reservoir toward these downstream filter Yo
In a particulate trap device that sequentially regenerates each filter, a pressure detecting means for detecting the pressure in the air reservoir and a high pressure when the pressure in the air reservoir is equal to or higher than a specified value at a predetermined time for regenerating the filter. When air is blown out and the pressure in the air reservoir is lower than the specified value, wait for a predetermined time to elapse
A particulate trap device provided with control means for blowing air. 3. A particulate trap according to claim 2, wherein a prescribed value for blowing out high-pressure air from an air reservoir is set lower than that of a filter that has been previously regenerated. apparatus.