KR20070105166A - Exhaust gas purifier for diesel engine and its control method - Google Patents

Abstract

An exhaust gas purifier for a diesel engine and a control method thereof are provided to regenerate a porous filter within a limited range of power supplied from an alternator and a battery. An exhaust gas purifier for a diesel engine includes an exhaust gas purifying unit(20), a thermal energy storing unit(30), a bypass pipeline(15), an exhaust gas direction adjustment unit(18), and an energy supply unit(40). The exhaust gas purifying unit is arranged on an exhaust pipeline(10), and equipped with a porous filter for reducing contaminant from exhaust gas. The thermal energy storing unit is arranged on the exhaust pipeline formed in front of the exhaust gas purifying unit, and stores thermal energy during regeneration of the filter, and heats exhaust gas. The bypass pipeline is connected to a front end and a rear end of the thermal energy storing unit. The exhaust gas direction adjustment unit adjusts flow direction of exhaust gas by opening/shutting a pipeline connected to the thermal energy storing unit and the bypass pipeline. The energy supply unit supplies energy for operating the thermal energy storing unit.

Description

Exhaust gas purifier for diesel engine and its control method

1 is a block diagram schematically showing a diesel exhaust gas purification apparatus according to a first embodiment of the present invention.

2 is a block diagram schematically showing a diesel exhaust gas purification apparatus according to a second embodiment of the present invention.

3 is a block diagram showing a diesel exhaust gas purification apparatus according to a third embodiment of the present invention.

4 is a block diagram showing a diesel exhaust gas purification apparatus according to a fourth embodiment of the present invention.

5 is a block diagram schematically showing a diesel exhaust gas purification apparatus according to a fifth embodiment of the present invention.

6 is a block diagram schematically showing a diesel exhaust gas purification apparatus according to a sixth embodiment of the present invention.

7 is a graph showing the relationship between the power supply amount and the BPT and the exhaust gas temperature in the prior art.

8 is a graph showing the relationship between the power supply amount and the BPT and the thermal energy storage body, the exhaust gas temperature in the present invention.

<Explanation of symbols for main parts of the drawings>

10: exhaust pipe 15: bypass pipe

18: exhaust gas direction control means 20, 20A: exhaust gas purification means

30: heat energy storage means 35: second exhaust gas purification means

40: energy supply means 40A: microwave generating means

40B: energy supply means 50: detection means

60: electronic control means

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel exhaust gas purification device for reducing pollutants in exhaust gas generated from a diesel engine, and in particular, a diesel exhaust gas purification device for regenerating a filter at an appropriate time by monitoring and burning smoke accumulated in the filter. And a control method thereof.

The diesel exhaust gas purification device is a device that burns and removes harmful components contained in a gas discharged from a diesel engine.

The term 'soot' refers to fine particles generated by the combustion of a fuel, which is also referred to in the art as particulate material (PM), soot or fine dust.

Diesel particulate filter (DPF) is a device that is installed in an exhaust pipe of a diesel vehicle to capture and burn soot in the exhaust gas generated from a diesel engine and release it to the atmosphere.

Balance point temperature (BPT) refers to an exhaust gas temperature at which the amount of soot collected in the diesel particulate filter is equal to the amount of combustion and removal.

An example of such a device is US Pat. No. 6,709,489. The device of the patent uses a honeycomb filter made of cordierite (2MgO-2Al ₂ O ₃ -5SiO ₂ ) as a filter. The filter is composed of a plurality of channels parallel to the traveling direction of the exhaust gas, and has a structure in which open channels and closed channels are alternately planarly formed on the inlet side of the exhaust gas. Exhaust gas introduced into the open channel of the filter accumulates soot near the end of the open channel or in the channel wall, and the remaining exhaust gas is discharged out of the filter through a so-called wall-flow through the channel wall.

As related patents, Korean Patent No. 194-0000808, US Patent No. 6,809489 B2, US Patent No. 6,328,779 B1, US Patent No. 5,195,317, US Patent No. 5,087,272, US Patent No. 4,934,141, and the like are known. It is.

In such a diesel particulate filter device, the channel wall is blocked by the particulate smoke accumulated in the filter, and thus a process of regenerating the filter by removing it is required. At this time, microwave is used as an energy source for regeneration of the filter. The microwaves generated by the microwave generating means are transmitted to the filter to dielectrically heat the filter and the soot, and the soot accumulated in the filter by the heating of the filter and the soot is burned and removed.

One of the most important points in the regeneration process of diesel particulate filter is the energy consumption (power consumption versus regeneration time) required for regeneration. In particular, it is important to complete the regeneration of the filter in a short time with low power consumption within the limited power range of the vehicle. If the power used for the regeneration of the filter is excessively larger than the power supplied by the generator and the battery of the vehicle or the regeneration time of the filter is excessively long, the lifespan of the generator and the battery of the vehicle is not only shortened, but the fuel economy is also deteriorated. . This problem becomes even more important in the case of using electric devices such as headlights, audio and electric heaters while driving a vehicle.

When the filter is regenerated using the electric energy of the vehicle, the energy consumption is greatly influenced by the engine condition (exhaust amount, load amount, engine speed, etc.) of the vehicle. According to the engine conditions, the state of the exhaust gas flowing into the filter is greatly affected. In general, in the city driving, the temperature of the exhaust gas is lower than the regeneration temperature of the filter, so that the electric energy heats the filter while the exhaust gas cools the filter.

Therefore, in order to overcome the cooling effect of the exhaust gas and to raise the filter to the regeneration temperature, considerable 'power' is required. As a result, the 'power consumption' required for filter regeneration is significantly increased. For example, if a diesel engine with a displacement of 2000cc is operated at 1500rpm and the exhaust temperature is 100 ° C, and it takes 10 minutes to raise the temperature of the filter to a regeneration temperature of about 300 ° C (all inputted electric energy is used to heat the filter). The power consumption required for the regeneration of the filter is about 5.5 kW or more. This is a 'power' that cannot be supplied by the generator and battery of a 2000cc diesel engine.

As described above, the diesel particulate reduction device using the conventional electric energy has a problem of shortening the life of vehicle generators and capacitors or failure and deterioration of fuel consumption due to excessive power required for filter regeneration. It is difficult to apply to diesel vehicles that supply very limited power.

The present invention has been made to solve the above problems, the diesel exhaust gas purification device to regenerate the porous filter collected diesel soot with less power consumption for a short time using the heat energy storage means and the exhaust gas direction control means. And to provide a control method thereof.

Another object of the present invention is to provide a diesel exhaust gas purification device and a control method thereof, which can regenerate a filter within a limited power range provided by an alternator and a battery (battery) of a vehicle when applied to a diesel vehicle. .

Diesel exhaust gas purification apparatus according to the present invention for realizing the above object, the exhaust gas purification means is provided on the exhaust pipe line and provided with a porous filter to reduce the pollutants of the exhaust gas; Heat energy storage means provided on an exhaust pipe in front of the exhaust gas purifying means to store thermal energy during the regeneration of the filter and then heat the exhaust gas; A bypass pipe connected to the front end and the rear end of the thermal energy storage means; Exhaust gas direction control means for controlling the flow direction of the exhaust gas by opening and closing the pipe line and the bypass pipe to the thermal energy storage means; It characterized in that it comprises an energy supply means for supplying energy to operate the thermal energy storage means.

Here, the exhaust gas purification means is preferably composed of a porous filter and a conductive housing containing the same.

The thermal energy storage means is preferably composed of a porous heating element and a conductive housing for receiving it.

The exhaust gas purifying means comprises a porous filter, the thermal energy storage means comprises a porous heating element, the porous heating element is used that is relatively low filtration rate, the porous filter is preferably used a relatively high filtration rate. Do.

The thermal energy storage means may be configured to simultaneously perform the heating element function and the purification filter function.

At least one of the porous filter of the exhaust gas purifying means and the porous heating element of the heat energy storage means preferably includes a catalytic material.

The exhaust gas direction control means is preferably composed of an electronically controlled valve for opening and closing each of the pipeline and the bypass pipe to the heat energy storage means.

The energy supply means is preferably configured to receive electric energy from an alternator or a battery (battery) of a diesel engine and to supply the thermal energy storage means.

The energy supply means may be configured to provide microwave energy to the thermal energy storage means. Here, the energy storage means is preferably composed of a porous heating element of the dielectric material.

Alternatively, the energy supply means is configured to provide electrical energy to the thermal energy storage means, the thermal energy storage means is preferably composed of a conductive heating element that generates heat by the electrical energy.

And detecting means provided on the exhaust pipe for detecting an exhaust gas state and electronic control means for controlling the operation of the energy supply means and the exhaust gas direction adjusting means based on the detection signal of the detecting means. Can be.

Preferably, the electronic control means is configured to control the operation of the energy supply means and the exhaust gas direction control means based on the detection signal of the diesel engine operating state while receiving the signal from the detection means.

Preferably, the electronic control means is configured to control the operation of the heat energy supply means and the electronically controlled valve at predetermined driving distances based on the driving distance information of the vehicle on which the apparatus is mounted instead of the amount of dust collected by the filter.

In addition, the diesel exhaust gas purification apparatus according to the present invention for realizing the above problems, is installed on the exhaust pipe, the first exhaust gas is composed of a porous filter and a conductive housing for receiving it to reduce the pollutants of the exhaust gas Purifying means; A heat energy storage means provided on an exhaust pipe path in front of the exhaust gas purifying means, the porous heating element and a conductive housing accommodating the heat gas storage means for storing heat energy during the regeneration of the filter and transferring the heat energy to the exhaust gas; A second exhaust gas purifying means located on an exhaust pipe between the thermal energy storage means and the first exhaust gas purifying means, the second exhaust gas purifying means comprising a porous filter and a conductive housing accommodating the second exhaust gas purifying means; A bypass conduit connected to a rear end of the second exhaust gas purification means at a front end of the thermal energy storage means; Exhaust gas direction control means for controlling the flow direction of the exhaust gas by opening and closing the pipeline leading to the thermal energy storage means and the second exhaust gas purification means and the bypass pipeline; It characterized in that it comprises an energy supply means for supplying energy to operate the thermal energy storage means.

In addition, the diesel exhaust gas purification apparatus control method according to the present invention for realizing the above object is a control method using the diesel exhaust gas purification apparatus, to the porous filter of the exhaust gas purification means and / or the thermal energy storage means. When the amount of soot collected is equal to or greater than a predetermined value, controlling to open the bypass pipe at the same time as blocking the pipe to the heat energy storage means, and controlling the heating element of the heat energy storage means to be heated; When the amount of soot collected in the exhaust gas purifying means and / or the porous filter of the thermal energy storage means is less than or equal to a predetermined value, the pipeline is connected to the thermal energy storage means and controlled to block the bypass pipe. The operation of the thermal energy storage means is characterized in that the control to stop.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

For reference, in describing various embodiments of the present disclosure, like reference numerals refer to like elements, and repeated descriptions thereof will be omitted.

1 is a block diagram schematically showing a diesel exhaust gas purification apparatus according to a first embodiment of the present invention.

As shown therein, the diesel exhaust gas purification apparatus according to an embodiment of the present invention includes exhaust gas purification means 20 installed on the exhaust pipe 10 and provided with a porous filter to reduce pollutants in the exhaust gas. On the exhaust pipe 10 in front of the exhaust gas purifying means 20, the thermal energy storage means 30 for storing the thermal energy during the filter regeneration process and heating the exhaust gas, and the thermal energy storage means 30 18. An exhaust gas direction control means 18 for controlling the flow direction of the exhaust gas by opening and closing the bypass pipe 15 connected to the front and rear ends, the pipe leading to the heat energy storage means 30 and the bypass pipe 15. ) And an energy supply means 40 for supplying electrical energy of a generator or storage battery of a diesel engine to the thermal energy storage means 30.

The exhaust gas purifying means 20 may be composed of a porous filter and a conductive housing accommodating the exhaust gas purifying means 20, and the heat energy storage means 30 is preferably composed of a porous heating element and a conductive housing accommodating the exhaust gas.

At least one of the porous filter of the exhaust gas purifying means 20 and the porous heating element of the thermal energy storage means 30 may further include a catalyst.

The exhaust gas direction control means 18 may be composed of an electronically controlled valve that opens and closes the conduit leading to the heat energy storage means 30 and the bypass conduit 15, respectively.

The energy supply means 40 is configured to receive electrical energy from an alternator or a battery (battery) of a diesel engine and to supply the thermal energy storage means 30.

Each of these components will be described in detail in the third embodiment to be described below.

2 is a block diagram schematically showing a diesel exhaust gas purification apparatus according to a second embodiment of the present invention.

As shown in the diesel exhaust gas purification apparatus according to another embodiment of the present invention, the exhaust gas purification means 20 of the above-described embodiment constitutes the first exhaust gas purification means 20A, the thermal energy storage means ( A second exhaust gas purifying means 35 is provided between 30A) and an end of the bypass pipe 15 to reduce pollutants of the exhaust gas.

Here, the second exhaust gas purifying means 35 may be composed of a porous filter and a conductive housing accommodating the same, similar to the first exhaust gas purifying means 20A.

At least one of the porous filter of the first exhaust gas purifying means 20A, the porous filter of the second exhaust gas purifying means 35, and the porous heating element of the thermal energy storage means 30A further includes a catalyst. desirable.

Since the other configuration is the same as the configuration of the above-described embodiment, a detailed description thereof will be omitted.

Next, the configuration of an embodiment incorporating the first and second embodiments of the present invention described above with reference to FIGS. 3 and 4 will be described.

3 is a block diagram showing a diesel exhaust gas purification apparatus according to a third embodiment of the present invention.

Diesel exhaust gas purification apparatus according to a third embodiment of the present invention, by using the microwave as the energy supply means 40 of the above embodiment, by detecting the state of the exhaust gas to adjust the energy supply means 40 and the exhaust gas direction It is configured to be able to control the means 18 and the like.

Each configuration of such a diesel exhaust gas purification device will be described in detail.

First, the exhaust gas purification means 20 includes a conductive housing 21 provided on the exhaust pipe line 10 and a porous filter structure provided inside the conductive housing 21 to reduce pollutants of the exhaust gas. Exhaust gas purifying filter 22 and the mat 23 provided inside the conductive housing 21 to block the flow of the exhaust gas, to insulate the filter 22 and to protect it from impact.

Next, the thermal energy storage means 30 is provided in the conductive housing 31 provided on the exhaust conduit 10 in front of the exhaust gas purifying means 20, and inside the conductive housing 31 to regenerate the filter. A thermal energy storage filter 32 having a porous heating element structure that stores and transfers thermal energy to the exhaust gas during operation, and blocks the flow of the exhaust gas inside the conductive housing 21 to insulate the filter 32 and insulate the impact. Mat 33 to protect against.

Here, the thermal energy storage filter 32 may use a dielectric filter coated or supported with a catalyst. The thermal energy storage filter 32 serves as an exhaust gas purification filter before the regeneration process, and burns and removes soot collected in the filter during the regeneration process. Serves as.

In consideration of the filtration rate of the exhaust gas, it is preferable that the thermal energy storage filter 32 uses a relatively low filtration rate, and that the exhaust gas purification filter 22 uses a relatively high filtration rate.

Meanwhile, the exhaust gas purification filter 22 having the porous filter structure and the thermal energy storage filter 32 having the porous heating element structure will be described in detail.

At least one of the two filters 22 and 32 may further include a catalytic material, preferably a precious metal catalyst or a transition metal catalyst such as Pt, Pd, Rh, Ir, Os, Ni, Co, Au, Ag, or the like. It includes. The combustion (oxidation) temperature of the soot, that is, the regeneration temperature of the filter, may be lowered according to the catalyst supported or coated on at least one of the two filters 22 and 32, and the pollutants such as CO, HC, and NOx may be reduced. Configured to do so.

Wherein the catalyst is activated at a temperature of about 250-400 ° C. to promote combustion of the soot. Further, in the present invention, as the catalyst, a catalyst in the form of a combination of the listed metal catalysts and other oxide catalysts, such as Pt / BaO, may also be used. The catalyst may be applied to the filter surface or doped inside the filter by conventional application means such as dipping. The catalyst particles are preferably dispersed in the filter on a nano scale, that is, a particle size of several tens to hundreds of nm.

In addition, the two filters 22 and 32 are ceramic materials such as cordierite, alumina (Al ₂ O ₃ ), silicon carbide (SiC), zirconia (ZrO ₂ ), titania (TiO ₂ ), zeolite, activated carbon, and silica. It may be formed of a material.

In the present invention, the structure of the two filters 22 and 32 may be a honeycomb monolith, a pleated fiber, a foam, or a pellet filter. In addition, the exhaust gas purification filter 22 and the thermal energy storage filter 32 of the present invention also have a filter of any structure regardless of the flow type of the exhaust gas, that is, the wall flow type or the channel flow type. Can be used).

In addition, the two filters 22 and 32 may be formed of a metal or a metal alloy. The two filters 22 and 32 may be metal fibrous, metal substrate, or metal foam filters.

On the other hand, the mat 23 constitutes a support between the two filters 22, 32 and each conductive housing 21 to insulate each filter and protect it from impact.

In addition, reference numeral 35 denotes that the thermal energy storage means 30 serves as a thermal energy storage body when the exhaust gas purification means 20 serves as the first exhaust gas purification means as described in the second embodiment. Together, it is shown that it can serve as the second exhaust gas purification means (35).

Also, reference numeral 34 denotes a conductive network that prevents microwaves from leaking to the outside.

Next, the exhaust gas direction control means 18 is preferably composed of an electronically controlled valve provided in each conduit 10 (15), as described above, the electronically controlled valve is an electronic control means 60 to be described later The opening and closing is controlled by.

Next, the energy supply means 40 is composed of a microwave generating means 40A and a microwave transmitting means 45 for transmitting the microwaves to the thermal energy storage means 30 in this embodiment.

Here, the microwave generating means 40A is a conventional microwave generator, and is preferably configured to generate microwaves by using electrical energy of a generator or a battery of a diesel engine, and the microwave transmitting means 45 is configured to generate microwaves. It consists of the configuration of a typical waveguide that transmits.

Next, in the third embodiment of the present invention, in addition to the basic components described above, the detection means for detecting the state of the exhaust gas, and the microwave supply being the energy supply means 40 based on the detection signal of the detection means. It further comprises an electronic control means (60) for controlling the operation of the electronically controlled valve means 40A and the exhaust gas direction control means (18).

The detection means may comprise first detection means 50 for detecting the pressure and / or temperature state of the exhaust gas and / or second detection means (not shown) for detecting the amount of soot collected in the porous filter. .

The first detection means 50 is preferably installed on the exhaust pipe 10 in front of the heat energy storage means 30, the pressure sensor 51 and so as to detect the pressure and / or temperature of the exhaust gas and And / or the temperature sensor 51.

The second detection means does not add a separate sensor or the like, and the amount of soot collected in the porous filter through the exhaust gas pressure information of the first detection means 50 and the engine speed information input from the ECU or the like. It can be configured to detect, and can be configured to control the operation of the heat energy supply means 40 and the electronically controlled valve based on the detection signal.

Alternatively, the second detection means is separately installed in at least one of the exhaust gas purifying means 20 or the thermal energy storage means 30 to detect the amount of soot collected in the filters 22 and 32 of each means. It can also be configured to do so. Since the second detection means can also be used using various known sensors for detecting the state of the exhaust gas, the installation configuration of the specific sensor for this is omitted.

The electronic control means 60 receives the signals of the first detection means 50 and / or the second detection means and at the same time the energy supply means 40 based on the detection signal of the diesel engine state (RPM, etc.). And control the operation of the electronically controlled valve.

The electronic control means 60 regenerates the filter 32 when the amount of soot collected in the filters 22 and 32, which is determined by the back pressure of the filter, the engine speed, and the like, is greater than or equal to a predetermined value. To operate the heat energy supply means 40 and the exhaust gas direction control means 18 to block the pipeline passing through the heat energy supply means 40 and open the bypass pipe 15, the amount of soot On the contrary, the bypass line 15 stops the valve operation of the heat energy supply means 40 and the exhaust gas direction control means 18 to block and open the pipe passing through the heat energy supply means 40. To perform the function.

On the other hand, the detection means 50 may include one pressure difference sensor or two pressure sensors, the amount of soot collected is the pressure of the exhaust gas flowing into the filter 22, 32 and is discharged from the filter It can be determined by the difference in pressure of the exhaust gas and the engine speed.

In addition, the electronic control means 60 adjusts the direction of the heat energy supply means 40 and the exhaust gas at predetermined driving distances based on the driving distance information of the vehicle on which the device is mounted, instead of the amount of smoke collected by the filters 22 and 32. It may be configured to control the operation of the means 18.

That is, the control of the electronic control means 60 may be performed according to the travel distance information as well as the state information of the exhaust gas and the engine. For example, the electronic control means 60 and the thermal energy supply means 40 periodically at every predetermined travel distance (for example, 100 km) based on the output of the travel distance sensor (not shown) of the vehicle or the travel distance information of the ECU. The exhaust gas directional control means 18 may be operated to burn the soot collected in the filter 32.

4 is a configuration diagram showing a diesel exhaust gas purification apparatus according to a fourth embodiment of the present invention.

The diesel exhaust gas purification apparatus according to the fourth embodiment of the present invention has the same basic configuration as in the third embodiment, but the energy supply means 40B is configured to receive electric energy from a generator and / or a storage battery of a diesel engine. And, the thermal energy storage means 30 is configured only differently consisting of a porous heating element of a conductive material to generate the thermal energy by receiving the electrical energy.

The energy supply means 40B may be configured to be directly connected to a generator and / or a storage battery, but adjusts the amount of electrical energy supplied to the thermal energy storage means 30 according to a control signal of the electronic control means 60. It is preferable that the function is configured to include.

The thermal energy storage means 30 is composed of a housing 31 and a porous heating filter 32, the porous heating filter 32 may be composed of an electric heater or an electric heating filter, the second embodiment As described above, it is preferable to have a porous filter structure so as to have the function of the heat energy storage means 30 and the second exhaust gas purifying means 35 at the same time, and also have an electric heating element function. At this time, the porous heating filter 32 serves as an exhaust gas purification filter before the regeneration process, and serves as a thermal energy storage filter during the regeneration process.

Since other configurations and operations are similar to those of the above-described third embodiment, description thereof will be omitted.

5 and 6 are block diagrams schematically showing the diesel exhaust gas purification apparatus according to the fifth and sixth embodiments of the present invention, the backflow prevention means 70 in the configuration of the first and second embodiments described above ) 70A is added.

That is, when the exhaust gas flows through the bypass pipe 15 in the filter regeneration process of the heat energy storage means 30 (30A), the rear pipe line in the state in which the front pipe of the heat energy storage means (30) (30A) is blocked. Since the exhaust gas may be introduced into the thermal energy storage means 30 (30A) through, the exhaust gas is prevented from flowing back into the thermal energy storage means 30 (30A) during the filter regeneration process.

The backflow prevention means (70, 70A) is a check valve having a one-way valve structure, the forward flow of the exhaust gas passing through the heat energy storage means (30, 30A) is possible, but passes through the bypass pipe (15) Reverse flow of one exhaust consists of a valve configured to prevent it.

Such backflow prevention means 70 and 70A may use any kind of check valve as long as it has sufficient heat resistance and durability to withstand exhaust heat and soot among known check valves.

Referring to the operation of the diesel exhaust gas purification apparatus according to the present invention configured as described above are as follows.

FIG. 7 is a graph illustrating a relationship between power supply amount and BPT and exhaust gas temperature in the related art. When diesel power supplies a filter (for example, 500 W) to a filter for a predetermined time (for example, 10 minutes) in a diesel vehicle, the exhaust gas passing through the filter Due to the cooling by the gas, the temperature of the exhaust gas is only slightly increased, and the filter regeneration cannot be performed normally because it is far below the BPT of the filter.

On the other hand, Figure 8 is a graph showing the relationship between the power supply amount and the BPT and the thermal energy storage body, the exhaust gas temperature in the present invention, a constant time (for example 500W) in a diesel vehicle under the same conditions as in FIG. 10 minutes), the exhaust gas is passed through the bypass pipe 15 by the exhaust gas direction adjusting means 18, so that the heat gas does not pass through the thermal energy storage means 30, so that the thermal energy storage means 30 is discharged. Since the cooling is not performed by the gas, the temperature of the thermal energy storage means 30 can be raised to a temperature much higher than the BPT of the filter as shown in FIG.

Then, by changing the valve of the exhaust gas direction control means 18, the bypass pipe 15 is blocked and the exhaust gas passes through the heat energy storage means 30, as shown in (c) of FIG. The exhaust gas is heated by the means 30 so that the temperature of the exhaust gas rapidly reaches a temperature higher than the BPT of the filter, thereby regenerating the filter of the exhaust gas purification means 20.

As described above, according to the present invention, thermal energy storage means is supplied to the energy supply means 40 in a state where the exhaust gas of the diesel engine flows from the front end to the rear end of the heat energy storage means 30 through the bypass pipe 18 at the time of regeneration of the filter. After heating the 30 for a predetermined time, the exhaust gas is flowed into the heated thermal energy storage means 30 to raise the exhaust gas to a temperature considerably higher than the BPT, thereby increasing the porosity of the exhaust gas purifying means 20, 20A, 35. The soot trapped in the filter can be effectively burned and removed.

The above-described embodiments of the present invention are merely illustrative of embodiments of the present invention. Those skilled in the art to which the present invention pertains can make various modifications and modifications to the above-described embodiments, the modifications and modifications to the extent that does not depart from the scope of the technical spirit of the present invention the scope of the present invention Will belong to.

The diesel exhaust gas purification apparatus according to the present invention configured and operated as described above has an advantage of effectively regenerating a porous filter in which soot is collected with low power consumption for a short time by using a thermal energy storage means and an exhaust gas direction control means. .

In addition, the present invention has the advantage that the porous filter of the diesel exhaust gas purification means within the limited power range supplied by the alternator and the battery (battery) of the vehicle when applied to a diesel vehicle.

In addition, the present invention can lower the regeneration temperature of the filter by supporting or coating the catalyst material on the porous filter provided in the energy storage means and / or the exhaust gas purification means as well as pollutants such as CO, HC, NOx in the exhaust gas There is also an advantage that can be reduced together.

Claims (16)

Exhaust gas purification means installed on the exhaust pipe and provided with a porous filter to reduce pollutants of the exhaust gas; Heat energy storage means provided on an exhaust pipe in front of the exhaust gas purifying means to store thermal energy during the regeneration of the filter and then heat the exhaust gas; A bypass pipe connected to the front end and the rear end of the thermal energy storage means; Exhaust gas direction control means for controlling the flow direction of the exhaust gas by opening and closing the pipe line and the bypass pipe to the thermal energy storage means; Diesel exhaust gas purification apparatus comprising an energy supply means for supplying energy to operate the thermal energy storage means. A first exhaust gas purifying means installed on the exhaust pipe and configured of a porous filter and a conductive housing accommodating the exhaust pipe to reduce contaminants of the exhaust gas; A heat energy storage means provided on an exhaust pipe path in front of the exhaust gas purifying means, the porous heating element and a conductive housing accommodating the heat gas storage means for storing heat energy during the regeneration of the filter and transferring the heat energy to the exhaust gas; A second exhaust gas purifying means positioned on an exhaust pipe between the thermal energy storage means and the first exhaust gas purifying means, the porous filter and a conductive housing accommodating the second exhaust gas purifying means to reduce pollutants in the exhaust gas; A bypass conduit connected to a rear end of the second exhaust gas purification means at a front end of the thermal energy storage means; Exhaust gas direction control means for controlling the flow direction of the exhaust gas by opening and closing the pipeline leading to the thermal energy storage means and the second exhaust gas purification means and the bypass pipeline; Diesel exhaust gas purification apparatus comprising an energy supply means for supplying energy to operate the thermal energy storage means. The method according to claim 1, The exhaust gas purification means is a diesel exhaust gas purification device, characterized in that consisting of a porous filter and a conductive housing for receiving it. The method according to claim 1, The thermal energy storage means is a diesel exhaust gas purification apparatus comprising a porous heating element and a conductive housing for receiving it. The method according to claim 1 or 2, The exhaust gas purifying means comprises a porous filter, the thermal energy storage means comprises a porous heating element, the porous heating element is used that has a relatively low filtration rate, the porous filter is characterized in that using a relatively high filtration rate. Diesel exhaust gas purification device. The method according to claim 1, The thermal energy storage means is a diesel exhaust gas purification device, characterized in that configured to perform a heating element function and a purification filter function at the same time. The method according to claim 1 or 2, At least one of the porous filter of the exhaust gas purification means and the porous heating element of the thermal energy storage means comprises a diesel exhaust gas purification device. The method according to claim 1 or 2, The exhaust gas direction control means is a diesel exhaust gas purification device, characterized in that composed of an electronically controlled valve for opening and closing each of the pipeline and the bypass pipe to the thermal energy storage means. The method according to claim 1 or 2, The energy supply means is a diesel exhaust gas purification device, characterized in that configured to be supplied to the thermal energy storage means receives the electrical energy of the alternator or battery (battery) of the diesel engine. The method according to claim 1 or 2, The energy supply means is a diesel exhaust gas purification device, characterized in that configured to provide microwave energy to the thermal energy storage means. The method according to claim 10, The energy storage means is a diesel exhaust gas purification device, characterized in that the porous heating element of the dielectric material. The method according to claim 1 or 2, The energy supply means is configured to provide electrical energy to the thermal energy storage means, The thermal energy storage means is a diesel exhaust gas purification device, characterized in that the conductive heating element to generate heat by electrical energy. The method according to claim 1 or 2, And detecting means provided on the exhaust pipe to detect the state of the exhaust gas, and electronic control means for controlling the operation of the energy supply means and the exhaust gas direction adjusting means based on the detection signal of the detecting means. Diesel exhaust gas purification device. The method according to claim 13, The electronic control means is configured to control the operation of the energy supply means and the exhaust gas direction control means based on the detection signal of the diesel engine operating state while receiving the signal of the detection means. . The method according to claim 13, The electronic control means is a diesel exhaust gas purification, characterized in that configured to control the operation of the thermal energy supply means and the electronically controlled valve for each predetermined travel distance based on the travel distance information of the vehicle on which the device is mounted instead of the amount of dust collected by the filter. Device. A control method using the diesel exhaust gas purification device of claim 1, wherein the amount of soot collected in the porous filter of the exhaust gas purification means and / or the thermal energy storage means is greater than or equal to a predetermined value. Blocking and controlling to open the bypass pipe, and to control the heating element of the thermal energy storage means is heated, When the amount of soot collected in the exhaust gas purifying means and / or the porous filter of the thermal energy storage means is less than or equal to a predetermined value, the pipeline is connected to the thermal energy storage means and controlled to block the bypass pipe. The control method of the diesel exhaust gas purification device, characterized in that for controlling the operation of the thermal energy storage means to be stopped.

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