JPH0710415U - Particulate trap device - Google Patents

Abstract

(57) [Summary] [Purpose] Reproduce each filter equally. [Structure] A plurality of filters 1 and 2 for collecting particulates in engine exhaust are provided, and high-pressure air from an air reservoir 5 is sequentially provided from backwash nozzles 3 and 4 provided on the downstream side of each filter 1 and 2 during a regeneration period. By blowing off the collected particulates into the combustion chamber,
In the particulate trap device for sequentially regenerating, the control means 6 for switching the regeneration order of the filters 1 and 2 each time the regeneration period comes.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a particulate trap device that traps and removes fine particles contained in the exhaust gas of a diesel engine.

[0002]

[Prior art]

 In a diesel engine exhaust passage, there is a particulate trap device that has multiple filters that collect particulates (particulates) in the exhaust and a backwash nozzle downstream of each filter.

This one has a combustion chamber below the filter, and when the filter is regenerated, the valve downstream of the filter is closed so that exhaust gas does not flow to the filter, and high pressure air is blown out from the backwash nozzle. The trapped particulates are blown down from the filter into the combustion chamber, and are burned and removed by the heater of the combustion chamber, so that each filter is regenerated in sequence at a predetermined time (Japanese Patent Laid-Open No. 2-188613). 3-18609, 4-10902, etc.).

[0004]

[Problems to be solved by the device]

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

The present invention aims to solve such a problem.

[0006]

[Means for Solving the Problems]

 As shown in FIG. 1, this device is provided with a plurality of filters 1 and 2 for collecting particulates in the exhaust gas of an engine, and backwash nozzles 3 and 4 provided on the downstream side of each filter 1 and 2 during a regeneration period. In the particulate trap device that blows high-pressure air from the air reservoir 5 in order to blow the trapped particulates down into the combustion chamber and regenerates the filters 1 and 2 in order, each filter 1, A control means 6 for switching the reproduction order of 2 is provided.

[0007]

[Action]

 Therefore, since the filter that has been regenerated later is regenerated first, even if the pressure of the air blown out with regeneration decreases, regeneration does not occur unevenly, and each filter is properly regenerated. To be done.

[0008]

【Example】

 FIG. 2 shows an embodiment of the present invention, and 10 is a trap body installed in an exhaust passage of a diesel engine.

In the trap body 10, the flow passage in the main body 10 is divided into two systems, and filters 11 and 12 for collecting particulates are inserted in the respective passages.

Shutter valves 15 and 16 are provided in the flow paths 13 and 14 on the downstream side of the filters 11 and 12, respectively.

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

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

Backwash nozzles 22 and 23 are installed on the downstream side of the filters 11 and 12 of the trap body 10, respectively.

High-pressure air from the air reservoir 19 is sent to the backwash nozzles 22 and 23 via the electromagnetic valves 24 and 25, respectively, and when the electromagnetic 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 controller 26 periodically issues a filter regeneration request to control the solenoid valves 17, 18, 24, 25 and the heater 21. 27 indicates a battery.

Although not shown, the air reservoir 19 is connected to a compressor of the engine, and when the pressure in the air reservoir 19 drops to a standard value, the compressor replenishes the air with a predetermined high pressure.

Next, the control content of the controller 26 will be described based on the flowchart of FIG. 3 and the timing chart of FIG.

When a filter regeneration request is generated, the filter 11 is started, and first, when a specified time t1 (for example, 1 second) elapses from the start by flag = 0 (initial value), the filter 11 (first block) is regenerated. (Steps 1 to 3). Note that 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 blown from the backwash nozzle 22 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 that have fallen into the combustion chamber 20 are incinerated by the heater 21.

When a specified time t3 (for example, 10 seconds) has elapsed from the start, the filter 12 (second block) is regenerated (steps 4 and 5).

To regenerate the filter 12, like the filter 11, the shutter valve 16 of the flow path 14 is closed and the solenoid valve 25 is opened for a very short time. As a result, the high-pressure air in the air reservoir 19 is blown 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 that have fallen into the combustion chamber 20 are incinerated by the heater 21.

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

Next, with the flag = 1, when the specified time t2 (for example, 300 seconds) has elapsed from the start, the filter 12 (second block) is regenerated (steps 1 → 7, 8).

The filter 12 is reproduced in the same manner as described above. The particulates that have fallen into the combustion chamber 20 are incinerated by the heater 21.

When a specified time t4 (for example, 310 seconds) has elapsed from the start, the filter 11 (first block) is reproduced (steps 9 and 10).

Regeneration of the filter 11 is performed in the same manner as described above. The particulates that have fallen into the combustion chamber 20 are incinerated by the heater 21.

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

Since the filters 11 and 12 are reproduced in this manner, 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 blown to the filter is reduced. However, the filter which has been regenerated first is regenerated next and is regenerated later. Since the filter performs the reproduction first, the reproduction of the filters 11 and 12 can be performed accurately without imbalance.

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

[0033]

[Effect of device]

 As described above, according to the present invention, a plurality of filters for collecting particulates in the exhaust gas of the engine are provided, and the high-pressure air from the air reservoir is blown out sequentially from the backwash nozzle provided on the downstream side of each filter during the regeneration period. In the particulate trap device that blows the trapped particulates into the combustion chamber and regenerates each filter in sequence, the regeneration order of each filter is switched every regeneration period, so each filter can be regenerated evenly and accurately. The system durability can be improved, high filter performance can be secured, and reliability can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a device.

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]

 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 (1)

[Scope of utility model registration request] 1. A trapping particulate matter is provided by providing a plurality of filters for trapping particulates in exhaust gas of an engine, and blowing out high-pressure air from an air reservoir sequentially from a backwash nozzle provided on the downstream side of each filter during a regeneration period. What is claimed is: 1. A particulate trap device, comprising: a particulate trap device that blows curate down into a combustion chamber and regenerates each filter in order.