JPH03210011A - Exhaust gas particulate purification device of diesel engine - Google Patents

Abstract

PURPOSE:To complete combustion of particulates with a smaller power consumption by providing a transmitting means which outputs high frequency for a transmitting period corresponding to the ratio of combustible grains and carbon grains in the captured particulates. CONSTITUTION:An exhaust gas particulate purification device 11 of a Diesel engine 1 has a filter 17 which captures particulates containing combustible grains and carbon grains in exhaust gas and a transmitting means made up of a magnetron transmitter 15 which combusts the particulates and reactivates the filter 17 and a waveguide 16. A control means 13 calculates accumulated value of the combustible grains and the carbon grains based on the operation hysteresis of the Diesel engine 1, and outputs high frequency from the magnetron transmitter 15 for a transmitting period corresponding to the ratio of the accumulated values. The transmitting means is operated for a transmitting period corresponding to the ratio of the combustible grains and the carbon grains in the particulates, so that the combustion of the particulates is performed with a smaller power consumption.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to DPF (Diesel Particu
This invention relates to a diesel engine exhaust particulate purification device that uses a magnetron oscillator to regenerate the late filter.

[Conventional technology]

Diesel engines, which use low-cost diesel oil, have superior fuel efficiency compared to gasoline engines, so they are now being used not only in large vehicles but also in ordinary cars. However, the above diesel engine
SOF (S.

1ble Organic Fraction
) and carbon particles such as 5OOT. Therefore, an exhaust particulate purification device that removes the above-mentioned particulates has become an important element in creating a low-pollution engine that protects the environment, as well as a device that improves the performance of a diesel engine.

Generally, the above-mentioned exhaust particulate purification device uses a filter such as a DPF made of ceramic in a honeycomb structure, and the particulates in the exhaust gas are collected and removed by this filter. It has become. However, the above filters become clogged due to the collection of fine particles. Therefore, conventional exhaust particulate purification devices burn the particulates using, for example, a filter regeneration device such as a burner or a heater, or an intake/exhaust throttle of the engine, to eliminate clogging of the filter.

[Problem to be solved by the invention]

However, 1. In the conventional diesel engine exhaust particulate purification device described above, in the case of a filter regeneration device using a burner, it is possible to reliably burn the particulates collected in the filter and eliminate clogging.
There are problems in that the structure of the burner etc. becomes complicated, leading to an increase in cost, and it is difficult to sufficiently improve reliability when igniting the burner.

In addition, in the case of a filter regeneration device using a heater, it is possible to construct it at a lower cost than the case of the burner described above, but it is difficult for the flame to propagate in the radial direction of the filter, and it is difficult to reliably burn particulates. The problem is that it is difficult to

Furthermore, in the case of intake/exhaust throttling, it is necessary to raise the exhaust gas temperature to the extent that particulates can be combusted. Therefore, in this case, it is necessary to operate the diesel engine at high speed and high load, and there is a problem in that the operating conditions are subject to very severe restrictions.

As described above, the above-mentioned filter regeneration device and the conventional exhaust particulate purification device that regenerates the filter using intake and exhaust throttles each have their own problems, and have not yet been commercialized.

Therefore, in recent exhaust particulate purification devices, clogging has been eliminated with a filter regeneration device using a magnetron oscillator, which has a completely different concept from the burner, heater, and intake/exhaust throttle described above.

That is, the above-mentioned filter regeneration device is composed of a magnetron oscillator that emits high-frequency waves that selectively heat particulates, and a reflecting member that reflects the high-frequency waves that are emitted from the magnetron oscillator. By irradiating the fine particles while being reflected by the reflective member, only the fine particles can be selectively and efficiently heated and burned.

By the way, the above-mentioned magnetron oscillator is electrically driven, and a battery mounted on a car is used as a power source. At this time, since the above-mentioned batteries are installed in automobiles, the amount of electric power is often limited. Therefore, it is desirable that the heating and combustion of fine particles by the magnetron oscillator described above can be completed with less power consumption.

Therefore, for example, Japanese Patent Application Laid-open No. 11414/1983 discloses an exhaust particulate purification device that regenerates the filter by adjusting the output of a magnetron oscillator according to the amount of adhering particulates collected by the filter. However, the above-mentioned fine particles have SOF and 500T, and their capacities differ depending on the number of rotations, load, etc. of the diesel engine. Furthermore, the above-mentioned SOF and 5OOT differ in the temperature at which combustion starts, and also in the optimum frequency for heating. Therefore, if the output is adjusted only by the adhesion amount of fine particles in which SOF and 5OOT are mixed, it is not possible to reduce the power consumption sufficiently.

Therefore, in the present invention, SOF in fine particles and 5OO
To provide an exhaust particulate purification device for a diesel engine, which can set the oscillation time or oscillation frequency of a magnetron oscillator to the optimum one for incinerating particulates based on the ratio with T, and can complete the incineration of particulates with even less power consumption. The purpose is to

[Means to solve the problem]

In order to solve the above problem, the diesel engine exhaust particulate purification device according to the invention of claim 1 includes a filter that collects particulates consisting of unburned particles and carbon particles in exhaust gas, and a filter that collects particulates consisting of unburned particles and carbon particles in exhaust gas. In a diesel engine exhaust particulate purification device that includes a filter regeneration device that regenerates the filter by combustion, the filter regeneration device has an oscillation time that corresponds to the ratio of unburned particles and carbon particles in the collected particulates. It is characterized by having an oscillation means such as a magnetron oscillator that outputs high frequency waves.

In order to solve the above problem, the diesel engine exhaust particulate purification device according to the invention of claim 2 includes a filter that collects particulates consisting of unburned particles and carbon particles in exhaust gas, and a filter that collects particulates made of unburned particles and carbon particles in exhaust gas. In a diesel engine exhaust particulate purification device that includes a filter regeneration device that regenerates the filter by combustion, the filter regeneration device has an oscillation frequency that corresponds to the ratio of unburned particles and carbon particles in the collected particulates. It is characterized by having an oscillation means such as a magnetron oscillator that outputs high frequency waves.

[For production]

According to the structures of claims 1 and 2, the particulates collected by the filter are composed of unburned particles and carbon particles. The above-mentioned unburned particles and carbon particles have different temperatures at which combustion starts, and also have different optimum frequencies for heating. Therefore, if the proportion of unburned particles and carbon particles in the collected particles differs, the time for irradiation with high frequency waves and the time for completion of combustion will vary depending on the frequency of the high frequency waves.

As a result, in the case of claim 1, the oscillation means for outputting high frequency waves is operated for an oscillation time corresponding to the ratio of unburned particles and carbon particles in the collected particles, so that the particles are incinerated. can be completed with even less power consumption.

On the other hand, in the case of claim 2, the oscillation means for outputting high frequency waves is operated at an oscillation frequency corresponding to the ratio of unburned particles and carbon particles in the collected particles, so that the incineration of the particles is prevented. It becomes possible to complete the process with even less power consumption.

[Embodiment 1] An embodiment of the invention as claimed in claim 1 will be described below with reference to FIGS. 1 to 4.

The diesel engine exhaust particulate purification device 11 according to this embodiment is connected to the exhaust pipe 2 of the diesel engine, as shown in FIG. The above-mentioned diesel engine 1 has a combustion chamber 3 consisting of, for example, four pistons and cylinders, and each of these combustion chambers 3 and
An intake manifold 4 having an opening 4a for sucking air is provided on the fuel intake side. and,
The intake manifold 4 includes an air cleaner 5 that filters the air taken in from the opening 4a, a throttle 6 that adjusts the intake amount of air filtered by the air cleaner 5, and a reflective member such as a wire mesh that reflects high frequencies. 22 are provided in this order. Note that this reflecting member 22 may be provided at the inlet 11a of the exhaust particulate purification device 11, which will be described later.

The diesel engine 1 is also provided with a drive shaft 7 that transmits the driving force generated in the combustion chambers 3, and this drive shaft 7 transmits fuel via a transmission member 8 such as a V-belt. It is connected to a fuel injection pump 9 that sends high pressure air to the combustion chambers 3 . . . and an air pump 10 that forcibly sends air to an exhaust particulate purification device 11 .

The air pump 10 described above includes a control unit (CPU) 1 which will be described later.
The electromagnetic clutch 12 is controlled by the transmission member 8 and the air pump 10.
The drive of the air pump IO is controlled by arbitrarily disconnecting the air pump IO. The air pump 10 is also provided with an air pipe 14 that leads air to the exhaust particulate purifier 11. It is located in Further, on the exhaust port 11b side of the exhaust particulate purification device 11, a reflecting member 23 similar to the above-mentioned reflecting member 22 is provided, and a silencer 24 for reducing exhaust noise is provided.

The above exhaust particulate purification device 11 is provided with a filter 17 that is a DPF. This filter 17 is
Wall Flow is a ceramic material with a honeycomb structure that has micropores that communicate from the front surface to the back surface.
This type is designed to collect unburned particles such as SOF and carbon particles of 800T contained in the exhaust gas from the diesel engine 1. Note that the filter 17 described above may be of a ceramic foam type.

The above-mentioned SOF is mainly composed of CH left after burning of the above-mentioned light oil, etc., and 5OOT is mainly composed of carbon after the light oil etc. are burned. These SOF and 5OOT are the engine speed of diesel engine 1 (
The ratio of SOF present in the exhaust gas differs depending on engine speed (rpm) and load (Pe), and as shown in Fig.
As e) decreases, it increases in the direction of the arrow. On the other hand, as shown in FIG. 4, the ratio of 5OOT increases in the direction of the arrow as the engine speed (rpm) decreases and the load (Pe) increases. The abundance ratio of each of these is calculated from the SOF emission map and 5OOT.
It is stored in the memory of the control means 13 as a discharge map.

The exhaust particulate purification device 11 that collects the above-mentioned SOF and 5OOT is provided with an oscillating means on the intake port 11a side as a filter regeneration device that burns these particulates. This oscillation means consists of a magnetron oscillator 15 that outputs a high frequency wave and a waveguide I6 that leads the high frequency wave into the exhaust particulate purification device 11. The magnetron oscillator 15 is connected to the control means 13. . This allows the magnetron oscillator 15 to have its high frequency frequency, output time, etc. controlled by the control means 13.

The above-mentioned magnetron oscillator 15 uses a multi-segment magnetron such as a Lecher wire resonance type 4-segment anode magnetron or a cavity resonance type 8-segment magnetron, and a Lecher wire of an appropriate length is connected between the cathode and the anode. By arranging them, a vibration circuit is formed. The output of the magnetron oscillator 15 is adjusted by moving the Lecher line, and the wavelength is adjusted by the voltage of the anode.

Further, on the same side as the magnetron oscillator 15, an exhaust pressure sensor 18 that detects the pressure on the suction port 11a side in the exhaust particulate purification device 11 and an 02 sensor 19 that detects the oxygen concentration are provided. Exhaust pressure sensor 18 and Ot
Sensor 19 is connected to control means 13 . Furthermore, an exhaust pressure sensor 20 and an 02 sensor 21 similar to the exhaust pressure sensor 18 and 02 sensor 19 described above are connected to this control means 13, and these exhaust pressure sensors 20 and 08 sensor 21 are connected to exhaust particulate matter. It is also provided on the exhaust port 11b side of the purification device 11. As a result, the control means 1
3 is capable of recognizing the combustion state of particulates and the clogging state of the filter 17 by inputting the exhaust pressure and oxygen concentration at the inlet 11a side and the outlet 11b side of the exhaust particulate purification device 11. There is.

Further, in addition to the exhaust pressure and oxygen concentration, the rotation speed, load, intake temperature, water temperature, and oil temperature of the diesel engine 1 are input to the control means 13 described above. Each of these data is stored in a memory in the control means 13 so that an operation history can be calculated, and this operation history includes the amount of SOF, which is the amount of SOF discharged by the filter 17, and the amount of SOF collected in the filter 17. It is now used as the basic data for calculating the amount of 5OOT, which is the amount of emissions.

Furthermore, the control means 13 includes the amount of SOF and 500TI.
A timer for setting the operating time of the magnetron oscillator 15 is built-in. These timers have two types of oscillation times T1 and T2 using a time setting reproduction routine programmed as a subroutine in the memory in the control means 13.
are set, and these oscillation times T1
- T2 can be switched arbitrarily based on the comparison result between 5OFI and 5OOT amounts.

The above oscillation times Tl-72 are different times, and the oscillation time T1 corresponds to the time required to incinerate SOF, which has a combustion start temperature of about 400°C.

On the other hand, the oscillation time T2 corresponds to the time required to incinerate 5OOT, which is a combustion start temperature of about 600°C. Therefore, if the amount of SOF is greater than the amount of 5OOT,
An oscillation time T1 corresponding to the time required to incinerate SOF is set, while an oscillation time T2 corresponding to the time required to incinerate 5OOT is set when 5OOTii is greater than 5OFil. Note that the above oscillation times T1 and T2 are set to the shortest time in which the SOF and 500T are completely incinerated.

In the above configuration, the procedure for regenerating the exhaust particulate purification device 11 will be described below based on the flowchart of the time setting regeneration routine shown in FIG.

First, a time setting regeneration routine is called during operation of the diesel engine l, and step (hereinafter referred to as S) 1 is performed.
is executed (S 1 ), and as shown in FIG. 2, the rotation speed, load, oil temperature, water temperature, intake temperature, and exhaust pressure are input as operating conditions to the control means 13 (32).
After this, the filter 17 (DP
It is determined whether or not it is time to reproduce F). Then, if it is not the time of playback, the answer is NO and S2 is executed again, and if it is the time of playback, the answer is YES and S4 is executed (S3).

In S4, the operating history is calculated from the rotation speed, load, etc. of the diesel engine 1 stored in the memory (S4), and furthermore, the integrated value of the SOF amount and 5OOTii is calculated based on this operating history (S5). ). Then the above SOF
The integrated value of the amount and the integrated value of the 5OOT amount are compared, and SOF
If the amount is greater than the 5OOT amount, select YES in S7.
is executed, while if the SOF amount is less than the 5OOT amount, S8 is executed as NO (S6).

S, which is the jump destination when the SOF amount is greater than 5OOT amount
In step 7, an oscillation time T1 corresponding to the SOF incineration time is set as the time for operating the magnetron oscillator 15 (S7). Then, at the same time as the timer starts counting, the magnetron oscillator 15 starts oscillating (S9
).

On the other hand, in S8, which is the jump destination when 5OFI is less than the amount of 5OOT, the oscillation time T2 corresponding to the incineration time of 5OOT is the time for operating the magnetron oscillator 15.
is set (S8). Then, the timer starts counting, and the magnetron oscillator 15 starts oscillating (39).

Next, both O2 sensors 19 and 20 provided on the intake port lla side and the exhaust port 11b side of the exhaust particulate purification device 11
An output indicating the detected oxygen concentration is input to the control means 13, and this oxygen concentration is temporarily stored, for example, in a calculation area formed in a memory (SIO). In addition, after the above oxygen concentration is memorized, the counting time T counted by the timer and the oscillation times T1 and T2 set in S7 or S8
are compared. Then, the counting time T is the oscillation time T1・
If it is smaller than T2, 312 is executed as YES, which is still within the oscillation time T1/T2, while if the counting time T is greater than or equal to the oscillation time T1/12, the oscillation time T1/T2 has elapsed. S15 is executed as NO (
311).

In S12, which is the jump destination when the counting time T is smaller than the oscillation times T1 and T2, the oxygen concentration OA on the suction port 11a side
It is determined whether or not is below a certain value, and if it is below a certain value, YES, indicating that there is a lack of oxygen required for combustion of particulates.
On the other hand, if the value exceeds a certain value, S14 is executed as NO indicating that oxygen is sufficiently present (S12). Then, when step 313 is executed, the air pump 10 is operated to supply air into the exhaust particulate purification device 11, and then step 314 is executed (step 5).
13).

314, the inlet 11a in the exhaust particulate purification device 11;
The oxygen concentration OA on the side and the oxygen concentration 0 on the exhaust port 11b side. are compared, and if the two oxygen concentrations OA'OI+ are not equal, it is assumed that the incineration of the particulates has not been completed yet, and the execution is repeated from SIO. On the other hand, both oxygen concentrations OA
'If O1 is equal, YE has finished incineration of fine particles.
315 is executed as S (S14).

S executed when both oxygen concentrations OA and Oll are equal
15 is also the jump destination when the above-mentioned counting time T is longer than the oscillation time T1/T2, and by executing this, after the air pump 10 is stopped (315), the oscillation of the magnetron oscillator 15 is stopped. (316). and,
S2 is executed again, or the subroutine time setting playback routine is terminated and the process returns to the main routine (S17).

In this way, the exhaust particulate purification device of this embodiment calculates the integrated value of the SOF amount and 5OOT amount collected by the filter 17 from the operating history of the diesel engine I, and compares these integrated values to determine the SOF. Calculate the ratio between the amount and the 5OOT amount, and calculate the oscillation time T1 corresponding to the SOF incineration time.
Alternatively, the oscillation time T2 corresponding to the incineration time of 5 OOT can be arbitrarily selected. Therefore, in the exhaust particulate purification device, the oscillation time TI・T2 is SOF and 5OO
By preventing the magnetron oscillator 15 from operating for longer than the time required to incinerate the fine particles made of T, it is possible to further reduce power consumption.

Furthermore, the exhaust particulate purification device of this embodiment has O.

Sensors 19 and 21 on the inlet 11a side and the outlet 11b
The oxygen concentration OA'01 on the side is detected, and if they match, the oscillation of the magnetron oscillator 15 is stopped even within the oscillation time TI·T2. This results in
The exhaust particulate purification device is capable of further reducing power consumption required for incinerating particulates.

In this embodiment, the operating time of the magnetron oscillator 15 is managed by two types of oscillation time T1 and T2, but the invention is not limited to this. That is, the operating time is determined by the amount of SOF and 5O
The oscillation time may be managed by continuously varying the oscillation time depending on the ratio with the OT amount.

T = KXWs/Wt However, T is oscillation time, K is constant, Ws is SOF amount, Wt
is the weight of microparticles consisting of SOF and 5OOT.

[Embodiment 2] An embodiment of the invention as claimed in claim 2 will be described below with reference to FIGS. 5 to 7. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment will be denoted by the same reference numerals, and the explanation thereof will be omitted.

The diesel engine exhaust particulate purification device II according to this embodiment is connected to the exhaust pipe 2 of the diesel engine 1 similar to that of the first embodiment, as shown in FIG. This exhaust particulate purification device 11 includes a filter 1 which is a DPF.
7 is provided, and this filter 17 is configured to collect fine particles such as 5OOT, which is carbon particles, and SOF, which is unburned particles, contained in the exhaust gas.

In addition, the exhaust particulate purification device 11 includes SOF and 5OOT.
An oscillating means serving as a filter regeneration device for burning particulates consisting of It consists of a wave tube 16.

The above high frequency is set to 6 types as frequencies for induction heating, 13.56Mc±0.05%, 27.12Mc
c±0.6%, 40.68Mc±0.05%, 915M
c±0.05%, 2,450Mc±50Mc, and 5
, 850Mc±75Mc. Among these frequencies for induction heating, the magnetron oscillator 15 has frequencies of 2 and 4.
It outputs a high frequency of 50Mc±50Mc, which is a frequency for induction heating. As a result, the high frequency waves emitted from the magnetron oscillator 15 are reflected on the outer wall of the exhaust particulate purifier 11 made of metal and the reflecting members 22 and 23, and are transmitted through the filter 17 made of ceramic. There is. This magnetron oscillator 15 is connected to a control means 13, and the high frequency oscillation frequency is controlled by this control means 13 to 2.450Mc±5.
It is designed to be controlled within a range of 0Mc.

The control means 13 also includes an exhaust particulate purification device 1.
The exhaust pressure and oxygen concentration in the diesel engine 1, the rotation speed, load, intake temperature, water temperature, and oil temperature of the diesel engine 1 are input. Each of these data is stored in the control means 1.
The operation history is stored in the memory of the filter 17 so that it can be calculated. It is now used as the basic data for calculations.

The above-mentioned SOF is mainly composed of CH that remains unburned from the above-mentioned light oil, etc., and increases as the engine speed (rpm) of the diesel engine 1 increases and the load (Pe) decreases. On the other hand, 5OOT is mainly composed of carbon after the combustion of light oil, etc., and its proportion in exhaust gas increases as the engine speed (rpm) decreases and the load (Pe) increases. There is. Then, each of these abundance ratios is calculated from the SOF emission map and 5O
It is stored in the memory of the control means 13 as an OT discharge map.

Furthermore, two types of set values are stored in the memory of the control means 13, and these set values operate the magnetron oscillator 15 at two types of oscillation frequencies f1 and f2. At this time, the above oscillation frequency 11・f2
is set to the optimum frequency for heating SOF and 5OOT obtained by the calculation formula below.

f = 1/(PXεr""Xtanδ) where P is the depth of penetration, εr is the relative dielectric constant, and δ is the dielectric power factor.

As a result, the oscillation frequency rt is set to most efficiently burn SOF, which has a combustion start temperature of about 400°C, and the oscillation frequency f2 is set to most efficiently burn SOF, which has a combustion start temperature of about 600°C. It is designed to burn efficiently. The above oscillation frequencies f1 and f2 are determined by the SOF amount and the 5O
The setting is arbitrarily switched based on the comparison result with the OT amount, and when the SOF amount is greater than the 5OOT amount, the oscillation frequency ri that is optimal for SOF combustion is selected, while the 5OOT amount is If it is larger than the SOF amount, 5
The optimum oscillation frequency f2 for OOT combustion is selected.

In the above configuration, the procedure for regenerating the exhaust particulate purification device 11 will be described below based on the flowchart of the frequency setting regeneration routine shown in FIG.

First, a frequency setting regeneration routine is called while the diesel engine 1 is operating, and step (hereinafter referred to as S) is performed.
21 is executed (S21). Then, as shown in FIG. 6, the rotation speed, load, oil temperature, water temperature, intake temperature, and exhaust pressure are input as operating conditions to the control means 13 (322).
. After that, based on the above exhaust pressure, filter 17 (DP
It is determined whether or not it is time to reproduce F). Then, if it is not the time of playback, the answer is NO and step 322 is executed again, and if it is the time of playback, the answer is YES and step S24 is executed (323).

In S24, the diesel engine 1 stored in the memory
The operation history is calculated from the rotation speed, load, etc. (S24),
Furthermore, an integrated value of the SOF amount and the 5OOT amount is calculated based on this driving history (S25). Then, the above S
The integrated value of the OF amount and the integrated value of the 3007 amount are compared, and S
The amount of OF is S.

If the SOF amount is greater than the OT amount, YES is determined and S27 is executed, whereas if the SOF amount is less than 50OT amount, NO is determined and step 328 is executed (326).

S, which is the jump destination when the SOF amount is greater than 5OOT amount
In step 27, an oscillation frequency f1 optimal for SOF combustion is set (S27), and oscillation of the magnetron oscillator 15 is started (S29). On the other hand, the amount of SOF is 5OO
At 32B, which is the destination when the amount is less than T, 5O
The optimum oscillation frequency f2 for OT combustion is set (32
B).

Then, the magnetron oscillator 15 starts oscillating (
S29).

Next, both Ot sensors 19 and 21 provided on the inlet lla side and the outlet 11b side of the exhaust particulate purification device 11
An output indicating the detected oxygen concentration is input to the control means 13, and these oxygen concentrations are temporarily stored, for example, in a calculation area formed in a memory (330).

Next, it is determined from the above oxygen concentration whether the oxygen concentration O^ on the inlet port 11a side is below a certain value, and if it is below the certain value, YES is determined, indicating that the oxygen necessary to burn the particulates is lacking. On the other hand, if the value exceeds a certain value, it is determined that oxygen is sufficiently present, and S33 is executed (S31). If step 332 is executed, the air pump IO is operated to supply air into the exhaust particulate purifier 11, and then step S33 is executed (332).

In S33, the inlet 11a in the exhaust particulate purification device 11
The oxygen concentration OA on the side and the oxygen concentration 0 on the exhaust port 11b side. If the two oxygen concentrations OA and OIl are not equal, it is determined that the incineration of the particles has not yet been completed, and the execution is repeated from S30. On the other hand, both oxygen concentrations O
If A.08 are equal, S34 is executed as YES indicating that the incineration of the fine particles has been completed (S33).

After the air pump 10 is stopped at 334 (
S34), the oscillation of the magnetron oscillator 15 is stopped (335). Thereafter, S22 is executed again, or the frequency setting reproduction routine, which is a subroutine, is completed and the process returns to the main routine (S36).

In this way, the exhaust particulate purification device of this embodiment calculates the amount of SOF collected by the filter 17 and the integrated value of 5OOTI from the operating MW of the diesel engine 1, and compares these integrated values to determine the amount of SOF. and 5OOTI, and it is possible to arbitrarily select the oscillation frequency f1 that is optimal for SOF combustion or the oscillation frequency f2 that is optimal for 5OOT combustion. Therefore, the exhaust particulate purification device can further reduce power consumption by efficiently burning particulates whose oscillation frequencies f1 and f2 are SOF and 5OOT.

In this embodiment, two types of oscillation frequencies r1 and f
Although combustion of particulates is performed in No. 2, the present invention is not limited to this.

In other words, the relationship between SOF and 5OOT and oscillation frequency is as follows:
As shown in FIG. 7, when 5OOT exists at a 100% abundance rate, combustion occurs most efficiently at a starting frequency of 2,500 Mc, but as the abundance rate of 5OOT decreases, the oscillation frequency decreases. When SOF exists at a 100% abundance rate, combustion occurs most efficiently at an oscillation frequency of 2,400 Mc.

Therefore, by storing the above relationship in a memory, for example, SOF
If the oscillation frequency can be selected from the relationship between the abundance ratio of 5OOT and 5OOT, a more optimal oscillation frequency can be obtained, thereby making it possible to burn SOF and 5OOT more efficiently.

[Effect of the invention] As described above, in the diesel engine exhaust particulate purification device according to the invention of claim 1, the filter regeneration device corresponds to the ratio of unburned particles and carbon particles in the collected particulates. This configuration has an oscillation means that outputs a high frequency wave with a certain oscillation time.

As a result, fine particles consisting of unburned particles and carbon particles, which have different combustion starting temperatures and optimal frequencies for heating, are oscillated by the oscillation means at an oscillation time corresponding to the ratio of unburned particles and carbon particles in the fine particles. is activated, it is possible to complete the incineration of particulates with even less power consumption.

As described above, in the diesel engine exhaust particulate purification device according to the invention of claim 2, the filter regeneration device generates a high frequency oscillation frequency corresponding to the ratio of unburned particles and carbon particles in the collected particulates. This configuration has an oscillation means that outputs .

As a result, the fine particles consisting of unburned particles and carbon particles, which have different combustion starting temperatures and optimum frequencies for heating, are oscillated by the oscillation means at an oscillation frequency corresponding to the ratio of unburned particles and carbon particles in the fine particles. is activated, it is possible to complete the incineration of particulates with even less power consumption.

[Brief explanation of drawings]

1 to 4 show an embodiment of the invention as claimed in claim 1. FIG. FIG. 1 is a flowchart of the time setting playback routine. FIG. 2 is a schematic configuration diagram of an exhaust particulate purification device for a diesel engine. FIG. 3 is a graph showing the abundance ratio of SOF. FIG. 4 is a graph showing the abundance ratio of 5OOT. 5 to 7 show an embodiment of the invention as claimed in claim 2. FIG. FIG. 5 is a flowchart of the frequency setting reproduction routine. FIG. 6 is a schematic configuration diagram of an exhaust particulate purification device for a diesel engine. FIG. 7 is a graph showing the relationship between the abundance ratio of 5OOT and SOF and the oscillation frequency at which combustion is performed with optimum efficiency. 1 is a diesel engine, 2 is an exhaust pipe, 3 is a combustion chamber, 4
10 is an intake manifold, 10 is an air pump 11 is an exhaust particulate purification device, 13 is a control means, 14 is an air pipe, 15 is a magnetron oscillator (oscillation means), 16 is a waveguide (oscillation means), 17 is a filter, 18 and 20 are exhaust pressure sensor,
19 and 21 are 0□ sensors, and 22 and 23 are reflective members. Figure 3 Figure 3) Δη woman (rpm)

Claims (1)

[Claims] 1. Exhaust from a diesel engine that has a filter that collects particulates consisting of unburned particles and carbon particles in exhaust gas, and a filter regeneration device that regenerates the filter by burning the particulates. In the particulate purification device, the filter regeneration device has an oscillation means that outputs a high frequency wave with an oscillation time corresponding to the ratio of unburned particles and carbon particles in the collected particulates. Engine exhaust particulate purification device. 2. In a diesel engine exhaust particulate purification device having a filter that collects particulates consisting of unburned particles and carbon particles in exhaust gas, and a filter regeneration device that regenerates the filter by burning the particulates, the above-mentioned A diesel engine exhaust particulate purification device characterized in that the filter regeneration device has an oscillation means that outputs a high frequency wave with an oscillation frequency corresponding to the ratio of unburned particles and carbon particles in the collected particulates. .