JPH0710028Y2 - Particulate trap filter regenerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a particulate trap filter regeneration device.

<Prior Art> In a diesel engine or the like, a trap filter for collecting exhaust particulates (hereinafter referred to as “particulates”) contained in exhaust gas is provided in the exhaust passage, but the particulate matter contained in the exhaust gas is When trapped in the trap filter and the amount of collected particulates increases, the exhaust pressure rises due to the clogging of the trap filter and the engine performance deteriorates. For this reason, there is a device which burns and removes the particulates collected in the trap filter by using a heating device such as a burner or a heater to regenerate the trap filter (for example, the actual development Sho 61-74616). Issue).

By the way, the particulates have a certain temperature (about 500 ℃)
If it is not above the value, it will not burn and if the temperature rises too much (10
(Over 00 ℃) The trap filter will be melted. Therefore, conventionally, the trap filter is heated, the temperature of the heated trap filter is detected by the temperature detection means, and the temperature of the filter is controlled by the temperature controller according to the detected temperature, and the fan at the air inlet, In some cases, by controlling the passage opening / closing valve in the exhaust passage, the temperature of the trap filter is controlled by adjusting the amount of air sent into the trap filter when the trap filter is being regenerated (Shokai Sho 63-1328).
No. 22).

<Problems to be Solved by the Invention> However, in the above-mentioned conventional apparatus, since the air is forcibly sent to burn the particulates, the particulates may self-ignite at a stretch. At that time, the temperature controller controls the temperature. I don't hear. Therefore, there is a possibility that the temperature of the trap filter rapidly rises to the melting temperature or higher, and the trap filter is melted. Further, since the air is sent and burned, there is a possibility that the burning state of the particulates cannot be made uniform due to the flow of air.

The present invention has been made in view of the above circumstances, and does not melt the particulate trap filter.
Moreover, the purpose was to burn the particulates completely to regenerate the trap filter.

<Means for Solving the Problems> Therefore, the present invention is directed to a particulate trap / trap filter regenerator having a trap filter which is installed in an exhaust passage of an engine and collects particulates, and is provided on the upstream side of the trap filter. The exhaust passage on the downstream side is provided with a passage opening / closing valve that closes the passage and shuts off air during regeneration of the trap filter, while the trap filter is provided with a heater for heating the filter and temperature detecting means of the filter, and at the time of regeneration of the trap filter. A temperature control means is provided which is connected to a power source outside the vehicle, electrically connects the heater to the temperature detection means, and controls energization of the heater according to the temperature detected by the temperature detection means.

<Operation> According to this configuration, the particulate matter generated while the vehicle is traveling is collected by the trap filter. After running,
The temperature control means is connected to a power source outside the vehicle, and the heater is heated and controlled so that the temperature of the filter becomes a constant temperature according to the temperature detected by the temperature detection means. At this time, the passage opening / closing valve provided on the upstream side of the trap filter on the downstream side is completely closed to shut off the air, and the particulate matter in the trap filter is burned with a limited amount of air. Therefore, since the particulates do not self-ignite all at once, the temperature can be controlled, and since the passage opening / closing valve is closed, the heating temperature of the trap filter can be kept uniform.

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

In FIG. 1, a heater 3 is provided on the outer periphery of a trap filter 1 (hereinafter simply referred to as “filter”) via a cushion material 2 so as to be wound around the outer periphery thereof. It is fixed. Further, a heat insulating material 5 which also serves as a cushioning material is provided around the heat insulating material 4, and the heat insulating material 5 is held by the filter case 6 to form the particulate trapper 7. In the particulate trapper 7, a thermocouple 8 as a filter temperature detecting means is projected from the side surface into the heater fixing heat insulating material 4. The particulate trapper 7 is fixed to the exhaust passage 10 by fastening both ends of the filter case 6 with bolts 9.

Solenoid valves 11a and 1 are provided on the upstream side and the downstream side of the exhaust passage 10, respectively.
Passage on-off valves 13a, 13b that are opened and closed by air cylinders 12a, 12b driven by 1b are provided. Also the exhaust passage 10,
A heat insulating material 14 is attached to the inner surfaces of the passage opening / closing valves 13a and 13b so as to keep the temperature of the filter 1.

The temperature controller 15, which is a temperature control means, is provided separately from the vehicle, is provided with an outlet 16 for connecting an external power source, and is also provided with solenoid valves 11a, 11b and heaters via connectors 17a, 17b, 17c, 17d and harness 18, respectively. 3. The thermocouple 8 is configured to be electrically connectable.

Next, the operation will be described.

Filter the generated particulates while the vehicle is running 1
To collect. Then, for example, when one day's traveling is completed and the vehicle is put in a garage or the like, the outlet 16 of the temperature controller 15 is connected to a vehicle external power source such as a commercial power source, and a connector 17
The solenoid valves 11a and 11b, the heater 3, and the thermocouple 8 are connected by a, 17b, 17c, and 17d. Then, the temperature controller 15 energizes the solenoid valves 11a, 11b on the upstream and downstream sides to close the passage opening / closing valves 13a, 13b via the air cylinders 12a, 12b to shut off the inflow of air into the filter 1.

Next, as shown in FIG. 2, a target temperature at which the particulates can burn is set, and the heater 3 is energized to heat to the target temperature. At this time, the temperature of the filter 1 is detected by the thermocouple 8, and the temperature controller 15 controls ON / OFF of energization of the heater 3 according to the detected temperature to regenerate the filter 1.

Therefore, by shutting off the air in this way,
Particulate burns with a limited amount of air,
Since it does not self-ignite all at once, temperature control is possible and the filter 1 is not melted. Further, since the air flow is eliminated, the temperature of the filter 1 can be kept uniform and the particulates can be completely burned.

When the regeneration of the filter 1 is completed, each connector 17a, 17b, 17
Remove c and 17d and store the temperature controller 15 in a garage or the like. In this way, since the filter 1 is completely regenerated during the next traveling of the vehicle, it is possible to always trap the particulates in a good filter state.

In this embodiment, the connectors 17a, 17b, 17c, 17d are provided separately, but if the multi-pin connectors 17A, 17B are combined into one as shown in FIG. 3, the temperature controller 15 and the heater 3 are provided.
It becomes easy to attach and detach. Further, if the temperature controller 15 is provided with a timer, by setting the time for burning the particulates, there is no need to manage the particulate trap / trap filter regenerator during operation, and no waste of electricity is consumed. It is economical.

<Advantage of Device> As described above, according to the present invention, since air is shut off by closing the passage opening / closing valve provided in the exhaust passage when the filter is regenerated, the particulate matter is limited to a limited amount of air. Burning, self-ignition all at once, the temperature does not rise rapidly, and the heater energization is controlled according to the temperature detected by the filter in such a state, so that the trap filter may be melted and damaged. There is no.
Also, since the passage opening / closing valve is closed, there is no air flow and the temperature of the trap filter can be kept uniform, and since it can be heated for a long time using an external power source, it is possible to completely burn the particulates. I can. Further, since the particulate trap filter is regenerated when the vehicle is not used, for example, after the vehicle has run for one day, it is possible to always run in a good filter state during the next running. Further, the temperature controller does not have to be mounted on the vehicle, which is advantageous in terms of vehicle space.

[Brief description of drawings]

FIG. 1 is a sectional view of a particulate trap filter regeneration device, FIG. 2 is a graph showing an embodiment of temperature control, and FIG. 3 is a view showing another embodiment using a multi-pin connector. . 1 ... Trap filter, 3 ... Heater, 8 ... Thermocouple, 13 ...
Passage on-off valve, 15… Temperature controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanori Komori, 1-chome, Ii-chome, Ageo City, Saitama Prefecture Nissan Diesel Industry Co., Ltd. (72) Atsushi Yamada 1-chome, 1-chome, Ageo City, Saitama Prefecture Nissan Diesel Industry Co., Ltd. Incorporated (72) Inventor, written by Kitamura, 1-chome, Ii-chome, Ageo-shi, Saitama, Nissan Diesel Industry Co., Ltd. (72) Inventor, Keiichi Niimura, 1-chome, Io-chome, Ageo, Saitama Prefecture, Nissan Nissan Industrial Co., Ltd. ( 72) Inventor Shuichi Nakamura, 1-chome, Ichome, Ageo City, Saitama Prefecture, Nissan Nissan Diesel Industry Co., Ltd. (56) Reference JP-A-58-180714 (JP, A) SAIKAI Sho-59-79513 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A particulate trap / trap filter regenerator having a trap filter interposed in an exhaust passage of an engine for collecting particulates, wherein an exhaust passage upstream and downstream of the trap filter is regenerated during trap filter regeneration. While providing a passage opening / closing valve that closes the passage and shuts off air, a heater for heating the filter and a temperature detecting means for the filter are provided in the trap filter, and at the time of regeneration of the trap filter, the trap filter is connected to a power source outside the vehicle, A particulate trap filter regeneration device comprising a temperature control means for electrically connecting the heater and the temperature detection means and controlling energization of the heater according to the temperature detected by the temperature detection means.