JPH0610120Y2 - Particulate trap filter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a particulate trap filter device for an internal combustion engine, and more particularly to a filter clogging prevention technique.

<Prior Art> In a diesel engine or the like, a particulate trap filter device for collecting exhaust particulates such as carbon (hereinafter referred to as particulates) contained in exhaust gas is provided in an exhaust passage.

By the way, when the amount of collected particulates increases, the exhaust pressure rises due to the clogging of the filter and the engine performance deteriorates. Therefore, for example, a heating device as shown in Japanese Utility Model Laid-Open No. 59-22915 is provided to filter the filter. Particulates are burned and removed by heating them to a burning temperature of about 600 to 1000 ° C.

<Problems to be solved by the device> However, in addition to particulates, iron powder in exhaust pipes and manifolds, sand remaining during casting, and slag (ash) of oil additives, etc. also adhere to the filter, Since these do not burn and cannot be removed at the above heating temperature, there is a problem that the filter gradually becomes clogged and the engine performance deteriorates. At present, there is no effective method for removing such adhering substances except to periodically remove the filter and drop it by tapping or the like.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a particulate trap filter device capable of removing an adhering substance that cannot be removed by heating without removing the filter.

<Means for Solving the Problem> Therefore, the present invention is a particulate trap filter device having a trap filter for trapping particulates which is interposed in an exhaust passage. A passage opening / closing valve is provided which closes the exhaust passage in conjunction with the operation of the exhaust brake, communicates with the exhaust passage between the upstream passage opening / closing valve and the trap filter, and is opened in association with the operation of the exhaust brake. And an atmosphere opening passage through which a filter is provided, and an exhaust passage between the downstream passage opening / closing valve and the trap filter and an air pressure source are connected through an air supply passage which is opened in association with the operation of the exhaust brake. Then configured.

<Operation> According to the above configuration, when the exhaust brake is actuated, the exhaust passage is closed by the passage opening / closing valves upstream and downstream of the trap filter, and the passage opening / closing valve of the atmosphere opening passage is opened to open the trap filter. The upstream side communicates with the atmosphere.
Then, the compressed air is supplied to the trap filter from the downstream side of the trap filter via the air supply passage, and the iron powder, the sand, the burnt residue of the oil additive, and the like adhering to the trap filter are blown off. The compressed air supplied to the trap filter is discharged to the atmosphere from the upstream side of the trap filter through the atmosphere opening passage, and at this time, the deposit is collected by the filter. The filter that has collected the adhering substances may be periodically replaced. Therefore, it is possible to automatically remove deposits that could not be removed until now, each time the exhaust brake is activated,
The trap filter is not clogged.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 showing the present embodiment, a particulate trap filter device 4 having a trap filter 3 for trapping particulates in a cylindrical case 2 is provided in an exhaust passage 1 of an internal combustion engine such as a diesel engine. ing. Reference numeral 5 is a heat insulating material interposed between the inner circumference of the tubular case 2 and the trap filter 3.

On the upstream and downstream of the trap filter 3 in the exhaust passage 1, passage opening / closing valves 8 and 9 which are slid in a direction orthogonal to the exhaust passage 1 by actuators such as air cylinders 6 and 7 are provided. The exhaust passage 1 between the passage opening / closing valve 8 on the upstream side of the trap filter 3 and the trap filter 3 is connected to an atmosphere release passage 11 that is open to the atmosphere and has a filter 10 interposed therein. A butterfly-type passage opening / closing valve 14 that is opened / closed by an air cylinder 12 via a link 13 is provided at a connection portion of the atmosphere opening passage 11.
The passage opening / closing valves 8 and 9 above and downstream of the trap filter 3 are closed when compressed air is supplied to the air cylinders 6 and 7,
On the contrary, the passage opening / closing valve 14 provided at the connection portion of the atmosphere opening passage 11 opens when air is supplied to the air cylinder 12.

Each of the air cylinders 6, 7 and 12 has an air pipe 15 connected to an air reservoir tank (not shown) in which compressed air is stored.
From each of the branch pipes 15a, 15b,
It is connected to the air reservoir tank via 15c.
Further, in the exhaust passage 1 between the trap filter 3 and the passage opening / closing valve 9 downstream thereof, from the branch pipe 15b to the connector 17
Compressed air supply pipe as an air supply passage branched by
18 connected.

Further, a normally closed solenoid valve 19 is provided in the air pipe 15 upstream of the connector 16. As shown in FIG. 2, the solenoid valve 19 includes a manual exhaust brake switch 20 that is turned on when the exhaust brake is activated, a clutch switch 21 that is turned on when the clutch pedal is released, and an accelerator switch 22 that is turned on when the accelerator pedal is released. Is connected to the battery 23 in series.

Next, the operation will be described.

When the exhaust brake is not operating, the solenoid valve 19 is closed, the air cylinders 6, 7, 12 are open to the atmosphere, the passage opening / closing valves 8 and 9 are open, and the passage opening / closing valve 14 is closed. Has become. Therefore, the exhaust gas from the engine flows into the trap filter 3 through the exhaust passage 1, where the particulates are collected and purified, and then discharged to the atmosphere through the exhaust passage 1 on the downstream side of the trap filter 3.

On the other hand, when the exhaust brake switch 20 is turned on to release the accelerator pedal to operate the exhaust brake, the solenoid valve 19 is opened by energization from the battery 23. Then,
Compressed air in the air reservoir tank (not shown) is the air piping
15 is supplied to each air cylinder 6, 7 and 12 through each branch pipe 15a, 15b and 15c, and is supplied to the trap filter 3
While the downstream passage opening / closing valves 8 and 9 are closed, the other passage opening / closing valve 14 is rotated to the position indicated by the solid line in the drawing to open. As a result, the exhaust passage 1 is closed and the exhaust brake is applied,
Further, the upstream side of the trap filter 3 is in communication with the atmosphere via the atmosphere opening passage 11.

Then, in synchronization with the operation of the passage opening / closing valves 8, 9 and 12, compressed air is supplied from the downstream side of the trap filter 3 into the trap filter 3 through the compressed air supply pipe 18 and adheres to the trap filter 3. Iron particles, sand, and deposits such as slag (ash) of oil-added material including particulates are blown off and flow out to the atmosphere from the atmosphere opening passage 11. The blown off deposits are carried by the air flow into the atmosphere open passage 11 and are collected by the filter 10.

According to this structure, the deposits such as iron powder, sand, and the slag of the oil additive which have been adhered to the trap filter 3 and could not be removed by combustion can be automatically removed every time the exhaust brake is actuated. . Therefore, it is not necessary to remove the trap filter 3 for removing the adhering substances as in the conventional case. Then, the trap filter 3 can be prevented from being clogged, and good trapping efficiency can always be maintained, the exhaust emission performance can be improved, and the flow of exhaust gas can be improved to improve the fuel consumption rate.

It should be noted that if the particulate trap filter device 4 is tilted slightly (θ) so that its upstream side is located below the downstream side as shown in FIG.
It is effective because it easily flows into the. Further, the filter 10 that has collected the adhering substances may be periodically replaced.

<Advantages of Device> As described above, according to the present invention, since the deposits on the trap filter can be automatically removed every time the exhaust brake is actuated, the work of removing the trap filter for removing the deposits can be performed. It becomes useless. Further, the trap filter can be prevented from being clogged and the exhaust flow becomes favorable, so that the fuel consumption rate can be improved and the high exhaust purification performance can be always maintained to improve the exhaust emission performance.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a solenoid valve energization circuit diagram of the embodiment. 1 ... Exhaust passage, 3 ... Trap filter, 6, 7, 12
...... Air cylinder, 8, 9, 14 ...... Passage opening / closing valve, 10 ......
Filter, 11 …… Air passage, 15 …… Air piping, 15a
〜15c …… Branch pipe, 18 …… Compressed air supply pipe, 19 …… Solenoid valve

Front page continued (72) Inventor, written by Kitamura, 1-chome, Ii-chome, Ageo-shi, Saitama, Nissan Diesel Industry Co., Ltd. (72) Inventor Shuichi Nakamura 1-chome, Ichome, Ageo City, Saitama Prefecture, Nissan Nissan Diesel Co., Ltd. (56) References: 60-18213 (JP, U) 61-171813 (JP, U) Actual Development Sho 59-70017 (JP, U) Actual Public Sho 63-38329 (JP, Y2) Actual Public Sho 63-38327 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A particulate trap filter device having a trap filter for trapping particulate matter interposed in an exhaust passage, wherein an exhaust passage is provided upstream and downstream of the trap filter in association with an exhaust brake operation. A passage opening / closing valve to be closed is provided, and a passage opening / closing valve communicating with the exhaust passage between the upstream side passage opening / closing valve and the trap filter and opened in association with the operation of the exhaust brake and an atmosphere opening passage through which the filter is interposed are provided. A particulate trap filter, wherein the particulate trap filter is provided, and an exhaust passage between the downstream passage opening / closing valve and the trap filter and an air pressure source are connected via an air supply passage that opens in association with operation of an exhaust brake. apparatus.