JPH10212928A - Filter recovering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover a filter and assure the durability of the filter by burning and removing a particulate with a high reproduction efficiency while restraining the increase of the particulate combustion temperature without using a temperature sensor, on the reproduction device of the filter for gathering the particulate in an exhaust gas. SOLUTION: In this device, a control means 79 estimates the temperature of a particulate induced and heated in the reproduction based on the detected micro wave strength of a micro wave strength detection means 67 obtained during the operation of a micro wave supply means 59 and an air supply means 72 and controls the micro wave supply means 59 and the air supply means 72 based on the estimated temperature. Thereby, the particulate gathered to the filter is burned and removed safely and efficiently and the durability of the filter 54 can be assured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for collecting particulates (particulate matter) contained in exhaust gas discharged from a diesel engine or the like with a filter and heating the particulates collected by the filter. The present invention relates to a filter regenerating apparatus that burns off and regenerates the trapping performance of a filter.

[0002]

2. Description of the Related Art A filter regeneration apparatus of this type suppresses filter erosion caused by particulate combustion heat during filter regeneration and clogging of the filter due to cracks or unburned particulates, thereby ensuring the durability of the filter. This is a major practical issue.

[0003] It is known that particulates burn from about 600 ° C, and burners, electric heaters, microwaves, and the like are considered as energy supply means for preheating the particulates in this temperature range. The inventors of the present invention have developed a microwave heating type filter regenerating apparatus capable of heating particulates inside the filter and uniforming the filter temperature in order to suppress cracks and achieve high regeneration efficiency.

[0004] In the microwave regeneration system, the particulates are preheated by dielectric heating with microwaves, air is supplied after the preheating, and the particulates are burned in a filter. In order to guarantee the durability of the filter not only in the microwave system but also in other heating systems, it is required to suppress excessive temperature rise during particulate combustion and to prevent misfire. For this reason, it is important to grasp the particulate temperature at the time of preheating to prevent overheating or underheating, and to manage the amount of collected particulates.

Japanese Patent Laid-Open No. 5-1 discloses a conventional filter regeneration apparatus for detecting the temperature of particulates and the amount of trapped particulates.
The one described in JP-A-49126 was common. As shown in FIG. 7, the apparatus includes a filter 4 for collecting particulates, a regeneration gas supply unit 11 for supplying air, an ignition unit 6, a temperature sensor 17 as a filter temperature detection unit, Control means 13;
It has an engine speed sensor 14, exhaust temperature sensors 15 and 16, and pressure sensors 18 and 19.

In order to determine the reproduction start timing in the concentration of particulates, the control means 13 controls the pressure sensor 1
The pressure loss of the filter 4 is detected from the difference between 8 and 19,
This is corrected by the signals from the engine speed sensor 14 and the exhaust temperature sensors 15 and 16 to estimate the trapping amount. When the estimated trapped amount reaches the specified value, regeneration is started.

[0007] The control means 13 operates the temperature sensor 1 after the collection is completed.
7, it is determined whether or not the filter 4 is within the regeneration start temperature range.
The filter 4 is cooled by raising the temperature or by operating the regeneration gas supply means 11, and the regeneration start temperature range (for example, about 200
(° C.), the ignition means 6 and the regenerating gas supply means 11 are operated to preheat the particulates by direct heating by the ignition means 6 and hot air. Temperature sensor 17
The temperature of the filter 4 during preheating is detected, and when the temperature reaches a specified temperature (for example, about 600 ° C.), the operation of the ignition means 6 is stopped, and the operation of the ignition means 6 is stopped.
The particulates are burned and removed with the supplied air.

[0008]

However, in the conventional filter regeneration apparatus, the temperature of particulates is detected by a temperature sensor, and a metal thermocouple or a temperature resistor generally used as a temperature sensor is a microwave. Since accurate temperature measurement in an atmosphere is difficult, there has been a problem that it is difficult to detect a particulate temperature in a preheating stage or the like at the time of filter regeneration even if the conventional invention is applied to a microwave regeneration system.

Regarding the estimation of the trapping amount, the response when the trapping amount estimation for the concentration becomes impossible (for example, a sensor failure) is not disclosed.

[0010]

According to the present invention, there is provided a microwave supply means for supplying microwaves to a filter, an air supply means for supplying air, and a microwave intensity of a space containing the filter. A microwave intensity detecting means for detecting a microwave intensity for detecting the temperature, and a control means, for estimating and estimating the dielectrically heated particulate temperature based on the detected microwave intensity obtained at a predetermined operation of the air supply means. The microwave supply means and the air supply means are controlled based on the temperature.

According to the above invention, the particulate temperature can be accurately estimated during the regeneration without using a temperature sensor by the correlation between the detected microwave intensity and the particulate temperature. Preheating time can be variably controlled to supply air. As a result, the combustion temperature due to excessive preheating is not affected by the variation in the particulate temperature before the start of the regeneration (it fluctuates with the exhaust gas temperature of the internal combustion engine that is concentrated) and the variation in the microwave supply amount (the fluctuation in the power supply voltage). It is possible to prevent the temperature of the filter from becoming high or prevent misfire due to insufficient preheating, and to assure the durability of the filter. Further, unnecessary heating power can be suppressed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a filter for collecting particulates contained in exhaust gas of an internal combustion engine, microwave supply means for dielectrically heating the particulates collected by the filter, Air supply means for supplying air, microwave intensity detection means for detecting microwave intensity in the space containing the filter, and the filter collected based on the microwave intensity detected by the microwave intensity detection means Control means for burning and removing the particulates, wherein the control means detects the particulates during the dielectric heating based on the detected microwave intensity obtained by the predetermined operation of the air supply means during the operation of the microwave supply means. Estimating a temperature and controlling the microwave supply means and the air supply means based on the estimated temperature; It is.

From the correlation between the amount of change in the microwave intensity and the particulate temperature, the temperature of the dielectrically heated particulate can be estimated from the microwave intensity obtained by the predetermined operation of the air supply means. As a result, the particulate temperature can be accurately estimated during the regeneration, and air for combustion can be supplied at the timing of preheating to the optimum temperature. As a result, the variation in the particulate temperature before the start of regeneration (it fluctuates with the exhaust gas temperature of the concentrated internal combustion engine), and the variation in the microwave supply amount (fluctuation in the power supply voltage)
For this purpose, the preheating time is variably controlled to prevent the combustion temperature from becoming too high due to excessive preheating, or to prevent combustion misfire due to insufficient preheating, thereby ensuring the durability of the filter.

The control means estimates the temperature of the particulates based on the change in the microwave intensity obtained by the operation of increasing or decreasing the air supply amount of the air supply means. Further, the control means shortens the cycle of the increase / decrease operation of the air supply amount of the air supply means when the estimated temperature exceeds the specified value.

When the estimated temperature exceeds the specified value, the period of the increase / decrease operation of the air supply amount is shortened, the frequency of temperature estimation near the particulate ignition temperature (about 600 ° C.) is increased, and the temperature is increased to the optimum temperature. Air can be supplied at the timing.

A filter for collecting the particulates contained in the exhaust gas of the internal combustion engine, microwave supply means for dielectrically heating the particulates collected by the filter, and air supply means for supplying air to the filter A microwave intensity detecting means for detecting a microwave intensity in a space accommodating the filter; and a control for burning and removing particulates collected by the filter based on the microwave intensity detected by the microwave intensity detecting means. Means, and the control means estimates the collection amount of particulates collected by the filter based on a detected microwave intensity obtained by a predetermined operation of the air supply means during operation of the microwave supply means. Controlling the microwave supply means and the air supply means based on the estimated trapping amount A.

The amount of trapped particulates can be estimated in the early stage of combustion from the correlation between the amount of change in microwave intensity and the amount of trapped particulates in the early stage of particulate combustion. In addition to the usual estimation of the trapping amount of particulates by the filter, the trapping amount is reconfirmed in the initial stage of particulate combustion during regeneration, and the microwave supply means and air supply are determined in accordance with the estimated trapping amount. By controlling the means, the reliability of collection volume management is improved,
Highly efficient regeneration at a low temperature can be guaranteed, and the reliability of the present apparatus can be improved.

The control means estimates the amount of trapped particulates based on the amount of change in the detected microwave intensity during a specified time period during continuous operation of the air supply means. The control means further reduces the supply amount of the microwave as the estimated trapping amount increases.

When the trapping amount is small, the amount of microwave supply necessary for maintaining the combustion is secured. On the other hand, when the trapping amount is large, the heating amount is reduced. The regeneration rate can be prevented from lowering, and the durability of the filter can be guaranteed. The control means further reduces the air supply amount as the estimated trapping amount increases.

Further, the combustion when the trapping amount is large is slowed down, the combustion temperature is prevented from increasing, and the durability of the filter can be guaranteed.

The control means operates the air supply means for a longer time as the estimated trapping amount increases.

When the trapped amount is large, the operation time of the air supply means is lengthened, and air is supplied until the trapped particulates are completely burned, so that the regeneration rate can be prevented from lowering. When the trapping amount is small, useless air supply can be omitted, and prolonged regeneration time can be prevented, thereby saving power.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram of a filter regeneration apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a flowchart showing a main routine of control of the apparatus.

In FIG. 1, exhaust gas discharged from an internal combustion engine (diesel engine) 51 is led through an exhaust pipe 52 to a filter 54 housed in a heating space 53.
The filter 54 has a honeycomb structure and captures particulates contained in the exhaust gas when the exhaust gas passes. The heating space 53 defines a space in which microwaves are substantially confined by microwave shielding means 55 and 56 having a punching hole configuration or a honeycomb configuration. Reference numeral 57 denotes a heat insulating material provided between the outer periphery of the filter 54 and the pipe wall 58 forming the heating space 53, and also serves as a support for the filter 54. The space in which the heat insulating material 57 is provided is cut off the flow of exhaust gas.

The microwave generated by the microwave supply means 59 is supplied to the coaxial transmission line 60 and the coaxial waveguide conversion antenna 6.
1. Power is supplied to the heating space 53 through the annular rectangular waveguide 62 and the power supply holes 63 and 64, and the particulates collected by the filter 54 are dielectrically heated. Reference numeral 65 denotes a driving power supply for the microwave supply means 59, which is an annular rectangular waveguide 62.
Has a configuration in which power supply holes 63 and 64 provided substantially facing the pipe wall surface of the exhaust gas discharge pipe 66 are disposed at the end. The coaxial waveguide conversion antenna 61 is disposed at a desired position of the annular rectangular waveguide 62 so that microwaves are emitted into the heating space 53 with a phase difference of 180 ° from the two feed holes 63 and 64. doing.

Reference numeral 67 denotes a microwave intensity detecting means provided in the heating space 53 in which the exhaust gas is blocked by the heat insulating material 57 and detecting the microwave intensity existing near the installation space by the operation of the microwave supply means 59. In addition, a coaxial line structure is adopted, and the center conductor 68 of the coaxial line is projected into the heating space 53 by a predetermined length. The microwave intensity detecting means 67 is provided at a position where the microwave intensity detection value monotonously decreases with an increase in the particulate collection amount at a desired particulate collection amount.

Normally, the valve 69 allows exhaust gas discharged from the internal combustion engine 51 to flow through the filter 54, and regenerates the filter 54 (burning and removing particulates collected by the filter 54 is referred to as filter regeneration). In this case, the exhaust gas is caused to flow through the exhaust branch pipe 70 by switching the valve position, and the exhaust gas is discharged through the muffler 71. The air supply means 72 supplies air containing oxygen into the heating space 53 through the air conveying pipe 73. Valve 7
4 and 75 control the flow of the oxygen-containing air to the filter 54. The valve 74 is disposed on a branch pipe 76 that is an exhaust path of air that has flowed through the filter 54 during regeneration of the filter 54, and the valve 75 is disposed between the heating space 53 and an exhaust pipe 77 that communicates with the atmosphere. By controlling the two valves 74 and 75, air for promoting the combustion of the heated particulates is passed through the filter 54 during regeneration of the filter 54.

The signal detected by the microwave intensity detecting means 67 is transmitted via a coaxial line 78 to an electronic control unit (ECU).
Is input to the control means 79. The control means 79 controls the drive power supply 65, the air supply means 72, the valve 69, the valve 74, and the valve 75 of the microwave supply means 59 based on the detected microwave intensity during the operation of the microwave supply means 59.
And the filter 54 is regenerated by burning and removing the particulates collected by the filter 54.

The operation and operation of the above configuration will be described below.
1 and 2, the control means 79 controls the valve 69, the valve 74, and the valve 75 at the time of particulate collection, and allows the exhaust gas discharged from the internal combustion engine 51 to pass through the filter 54, so that the particulate matter contained in the exhaust gas is removed. Collects curate and purifies exhaust gas. When the amount of the particulates collected in the filter 54 increases, the pressure loss in the filter 54 increases, the load on the internal combustion engine 51 increases, and in the worst case, the operation stops. The control unit 79 operates the microwave supply unit 59 at a predetermined cycle during the operation of the internal combustion engine 51 to estimate the trapping amount. Then, the detection value of the microwave intensity detecting means 67 is fetched at a point in time after a predetermined time from the start of the operation of the microwave supplying means 59. Control means 7
Numeral 9 estimates the amount of particulates collected by the filter 54 based on the detected microwave intensity detected by the microwave intensity detecting means 67. When the estimated trapping amount exceeds a predetermined value, it is determined that it is time to start the regeneration processing of the filter 54 (S100). In addition to the estimation of the collection amount of the concentration, in the present invention, the collection amount is estimated based on the microwave intensity detected by the microwave intensity detection means 67 during the reproduction (S107), and the concentration is estimated. In addition to responding to the variation in the collected amount, a backup is performed when the collected amount cannot be estimated for concentration, thereby improving the reliability of the collected amount management. The operating state of the internal combustion engine 51 (operating time,
The collection amount may be estimated from the load and the rotation speed).

When the control means 79 determines that it is time to start regeneration, it outputs a regeneration start signal (S101), and controls the valves 69, 74 and 75 during regeneration of the filter 4,
During the operation of the internal combustion engine 51, the exhaust gas is bypassed through the exhaust branch pipe 70. The microwave supply means 59 is operated (S102), and the particulates collected in the filter 54 are dielectrically heated by the supplied microwave.

The stop time toff during intermittent driving of the air supply means 72 is set to ta (for example, 3 minutes) (S103).
1) The estimated value Ti of the particulate temperature during dielectric heating is calculated based on the microwave intensity detected by the microwave intensity detecting means 67 obtained at the time of the intermittent operation (increase / decrease operation of the air supply amount) of the air supplying means 72 ( S1041, subroutine). T compared with the specified temperature T1 (for example, 450 ° C.)
If i is greater than T1, the process proceeds to the next step (S10).
51). Next, the stop time toff during the intermittent drive of the air supply means 72 is set to tc (for example, 1 minute) this time (S10).
32) Then, an estimated value Ti of the particulate temperature is calculated again (S1042, subroutine). Air supply means 72
The intermittent operation is shortened by shortening the stop time at the time of intermittent driving, and the frequency of the particulate temperature estimation is increased. If Ti is higher than T2 (for example, 650 ° C.), it is determined that the particulate preheating has been completed, and the process proceeds to the next step (S1052). In order to expand the combustion of particulates, the air supply amount Q0 (for example, 50
Air supply is started (continuous supply) at liters per minute (S106).

At the initial stage of combustion, the amount of trapped particulates Xi is calculated and reconfirmed (S107, subroutine) based on the microwave intensity detected by the microwave intensity detecting means 67 (S107, subroutine). And the operation of the air supply means 72 to control the respective supply amounts (S108, subroutine). In this way, it is possible to cope with the variation of the estimated value of the collection amount calculated for the concentration and to perform a backup when the estimation of the collection amount of the concentration cannot be performed.

After the end of S108, a reproduction end signal is output (S109), and the valve 69, the valve 74, and the valve 7 are output.
5 is again controlled to end one cycle of collection and regeneration. Then, the exhaust gas of the internal combustion engine 51 is caused to flow through the filter 54 in a state where the exhaust gas can flow through the regenerated filter 54.

Hereinafter, the estimation of the particulate temperature during regeneration of the filter 54 will be described in detail. The particulate temperature estimation is based on the microwave intensity detected by the microwave intensity detecting means 69 obtained when the air supply amount is increased or decreased due to the intermittent operation of the air supply means 72 at the stage of preheating the particulates for burning the particulates. Is estimated.

In FIG. 2, the stop time toff in the intermittent operation of the air supply means 72 is set to ta or tc (S1031 or S1032), and a subroutine (S1041 or S1042) for calculating the estimated particulate temperature is executed.

FIG. 3 is a diagram showing the subroutine.
The operation stop of the air supply means 72 is continued as it is for the time toff (S200), and thereafter the air supply means 72 is operated at the specified air volume Q0 (for example, 50 liters per minute) (S2).
01), the detected microwave intensity from the microwave intensity detecting means 67 is taken in as V0 (S202). Time tb
After a lapse of (for example, 30 seconds) (S203), the detected microwave intensity is taken in again as V1 (S204), and a change amount dV1 (V1-V0) of the detected microwave intensity is calculated (S205). Function f1 stored in control means 79
Is substituted for dV1 to obtain the estimated temperature Ti (S206), the operation of the air supply means 72 is stopped (S207), and this subroutine ends. Thereafter, Ti is compared with the specified temperature T1 or T2 (S1051 or S105
2), S1 until Ti becomes larger than T1 or T2
041 and S1051 or S1042 and S1052 are repeated. Here, the change amount dV of the detected microwave intensity is
F1 representing the relationship between 1 and the particulate temperature Ti
However, it has been found through experiments that there is a correlation between the detected microwave intensity variation dV1 and the particulate temperature Ti.

With these, the temperature of the particulates subjected to dielectric heating is estimated without using a temperature sensor, and when the particulates are preheated to an optimum temperature, air is continuously supplied to shift to a combustion state. Therefore, underheating or preheating can be prevented from being insufficient or excessive, and the filter can be regenerated with high efficiency at a low combustion temperature.

If the estimated temperature is higher than the specified temperature, the stop time during the intermittent drive of the air supply means 72 is shortened to shorten the cycle of the air supply amount increasing / decreasing operation and increase the frequency of estimating the particulate temperature. Accordingly, air can be supplied at the optimal timing for shifting to combustion, and the durability of the filter can be guaranteed by suppressing the combustion temperature from increasing and maintaining high regeneration efficiency.

Although the intermittent operation of the air supply means 72 has been described as the operation of increasing or decreasing the air supply amount, a valve (not shown) may be provided in the air flow path to increase or decrease the air amount.

Hereinafter, estimation of the amount of trapped particulate during regeneration of the filter 54 will be described in detail. In the particulate combustion stage after the completion of preheating, the amount of trapped particulates is estimated based on the detected microwave intensity of the microwave intensity detection means 67 obtained when the air supply means 72 operates continuously. Further, the operation of the microwave supply means 59 and the operation of the air supply means 72 are controlled in accordance with the estimated trapping amount to control the respective supply amounts.

In FIG. 2, the air supply means 72 has a supply amount Q.
0 (S10) and a subroutine (S10) for calculating the estimated particulate collection amount Xi during reproduction.
The process proceeds to 7), and further proceeds to a subroutine (S108) for controlling the microwave supply amount and the air supply amount according to Xi.

FIG. 4 is a diagram showing a subroutine for calculating the estimated particulate collection amount Xi during reproduction. The detected microwave intensity from the microwave intensity detecting means 67 is taken in as V2 (S300). After the specified time td (for example, 5 minutes) has elapsed (S301), the detected microwave intensity is set to V
3 (S302), and the detected microwave intensity change amount dV2 (= V3-V2) in the specified time zone td.
Is calculated (S303). The estimated trapping amount Xi is obtained by substituting dV2 into the function f2 stored in the control means 79 (S
304). At the initial stage of combustion during regeneration, the amount of trapped particulates, which is one of the factors that largely control the state of particulate combustion, is reconfirmed. Here, the function f2 represents the relationship between the change amount dV2 of the detected microwave intensity and the trapped amount Xi of the particulate matter. I discovered something through experimentation.

In this way, in addition to the estimation of the trapped amount of the particulate concentration, the trapped amount is reconfirmed in the initial stage of the particulate combustion during regeneration, and the microwave supply means 59 and the air supply are supplied in accordance with the estimated trapped amount. By controlling the means 72, even when it is impossible to estimate the collection amount of the concentration, it is possible to accurately grasp the collection amount and to guarantee the high regeneration efficiency at a low temperature, and the filter regeneration device Reliability can be improved.

FIG. 5 is a diagram showing a subroutine for controlling the microwave supply amount and the air supply amount according to Xi calculated in the previous subroutine. FIG. These are functions f3, f4, and f5 that use Xi as a variable to determine the supply amount and the supply time. First, a function f storing Xi in the control means 79
3, f4 and f5 to substitute microwave supply amount P1,
The air supply amount Q1 and their supply time te are obtained (S4001 to 4003). Microwave supply amount is P0
The output is changed from P0 to P1 (S401), the air supply amount is changed from Q0 to Q1 (S402), and the apparatus waits for a time te (S403). The microwave amount P1 and the air amount Q1
Continue to supply.

Here, P1 increases as Xi increases.
Is reduced. With this, when the trapping amount is large, the microwave supply amount is reduced to suppress the increase in combustion temperature,
On the other hand, when the trapping amount is small, the amount of microwaves necessary for maintaining combustion is secured, and high regeneration efficiency is maintained. In addition, as Xi increases, Q1 decreases. Thus, when the trapping amount is large, the combustion is slowed down by suppressing the air amount, and the combustion temperature is suppressed from increasing. As Xi further increases, t
e is lengthened. As a result, the total air amount is varied according to the trapped amount, and the particulates are burned efficiently.

The microwave supply is stopped to cool the burned filter 54 (S404), and the air supply amount is increased from Q1 to Q2 (for example, 100 liters per minute) (S405). After elapse of the time tf (S406), the air supply is stopped (S407), and this subroutine ends.

In the first embodiment, the exhaust gas during regeneration of the filter 54 is bypassed to the exhaust branch pipe 70 and the filter 5
4, the exhaust gas of the internal combustion engine 51 and the air supply means 72
The flow direction of the supply air is reversed in the bypass reverse flow regeneration method, but the twin filter method in which two filters 54 are provided, the flow of the exhaust gas of the internal combustion engine 51 and the flow of the supply air of the air supply means 72 with respect to the filters 54 The above embodiment can also be applied to a forward flow regeneration system having the same direction, a vehicle stop regeneration system in which the exhaust branch pipe 70 is eliminated, and the filter 54 is regenerated when the internal combustion engine 51 is stopped.

[0048]

As described above, according to the filter regeneration apparatus of the present invention, the following effects can be obtained.

(1) A microwave intensity detecting means is provided, and based on the detected microwave intensity of the microwave intensity detecting means obtained when the air supply means is operating during filter regeneration, the detected microwave intensity and the particulate temperature are compared. From the relation, it is possible to estimate the particulate temperature during dielectric heating without using a temperature sensor. As a result, the preheating time is variably controlled with respect to the variation in the particulate temperature before the start of the regeneration (it fluctuates with the exhaust gas temperature of the concentrated internal combustion engine), and the variation in the microwave supply amount (the fluctuation in the power supply voltage). Thus, it is possible to prevent the combustion temperature from becoming high, or to prevent the regeneration efficiency from decreasing due to combustion misfire due to insufficient preheating, and to guarantee the durability of the filter. Further, power can be saved by eliminating unnecessary preheating, which is particularly effective when the present apparatus is driven by a battery of a vehicle.

(2) If the estimated temperature exceeds a specified value, the cycle of the operation of increasing or decreasing the air supply amount is shortened, and the frequency of estimating the particulate temperature is increased, so that air can be supplied at the optimal timing for shifting to combustion, The durability of the filter can be guaranteed by suppressing the increase in temperature and maintaining high regeneration efficiency.

(3) A microwave intensity detecting means is provided, and based on the detected microwave intensity of the microwave intensity detecting means obtained at the time of operation of the air supply means during filter regeneration, the detected microwave intensity and the amount of collected particulates are determined. From the relationship, the amount of trapped particulates can be estimated in the initial stage of combustion. In this way, in addition to the collection amount estimation of particulate concentration by the filter which is usually performed, the collection amount is reconfirmed in the initial stage of particulate combustion during regeneration,
By controlling the microwave supply means and the air supply means according to the collected amount, the reliability of the collected amount management is improved,
Regeneration with high regeneration efficiency at low temperatures can be guaranteed, and the reliability of the filter regeneration device can be improved.

(4) When the amount of collected microwaves is small, the amount of supplied microwaves is reduced on the way, and the reduced amount of microwave supply is further reduced as the amount of collected particulates estimated during reproduction increases. Secures the amount of microwave supply necessary to maintain combustion, while reducing the amount of microwaves to reduce the amount of heating when the amount of trapping is large, to suppress the combustion temperature from increasing over a wide range of trapping and maintain high regeneration efficiency. As a result, the durability of the filter can be guaranteed.

(5) The air supply amount is reduced on the way, and the reduced air supply amount is further reduced as the particulate collection amount estimated during regeneration increases. The combustion can be slowed down by suppressing the amount, the combustion temperature of the filter can be prevented from increasing, and the durability of the filter can be guaranteed.

(6) By increasing the air supply time for combustion as the estimated trapping amount increases, the operating time of the air supply means is increased when the trapping amount is large, and Air can be supplied until the curate is completely burned to prevent a decrease in regeneration efficiency. On the other hand, when the trapping amount is small, useless air supply can be omitted, and a prolonged regeneration time can be prevented to save power. When the amount of power is small, useless air supply can be omitted to prevent a prolonged reproduction time, and power can be saved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a filter regeneration apparatus according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a main routine in control of Embodiment 1 of the filter regeneration device.

FIG. 3 is a flowchart of a subroutine in control of Embodiment 1 of the filter regeneration device.

FIG. 4 is a flowchart of a subroutine in control of Embodiment 1 of the filter regeneration device.

FIG. 5 is a flowchart of a subroutine in control of Embodiment 1 of the filter regeneration device.

FIG. 6 is a diagram showing control variables in control of Embodiment 1 of the filter regeneration device.

FIG. 7 is a configuration diagram of a conventional filter regeneration device.

[Explanation of symbols]

 Reference Signs List 51 internal combustion engine 54 filter 59 microwave supply means 67 microwave intensity detection means 72 air supply means 79 control means

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Norio Tao 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] 1. A filter for collecting particulates contained in exhaust gas of an internal combustion engine, microwave supply means for dielectrically heating the particulates collected by the filter, and air supply for supplying air to the filter. Means, microwave intensity detecting means for detecting microwave intensity in a space containing the filter, and burning and removing particulates collected by the filter based on the microwave intensity detected by the microwave intensity detecting means. Control means, wherein the control means estimates the temperature of the particulate during dielectric heating based on the detected microwave intensity obtained by the predetermined operation of the air supply means during the operation of the microwave supply means, and estimates the temperature. A filter regeneration device that controls the microwave supply means and the air supply means based on the temperature obtained. 2. The filter regenerating apparatus according to claim 1, wherein the control means estimates the temperature of the particulate based on a change amount of the detected microwave intensity obtained by an increase / decrease operation of the air supply amount of the air supply means. 3. The filter regeneration apparatus according to claim 1, wherein the control means shortens the cycle of the increase / decrease operation of the air supply amount when the estimated temperature exceeds a specified value. 4. A filter for collecting particulates contained in exhaust gas of an internal combustion engine, microwave supply means for dielectrically heating the particulates collected by the filter, and air supply for supplying air to the filter. Means, microwave intensity detecting means for detecting microwave intensity in a space containing the filter, and burning and removing particulates collected by the filter based on the microwave intensity detected by the microwave intensity detecting means. Control means, the control means estimating the amount of particulates collected by the filter based on a detected microwave intensity obtained by a predetermined operation of the air supply means during operation of the microwave supply means. And a filter for controlling the microwave supply means and the air supply means based on the estimated trapping amount. Raw devices. 5. The filter according to claim 4, wherein the control means estimates the amount of trapped particulates based on the amount of change in the detected microwave intensity during a specified time period during continuous operation of the air supply means. Playback device. 6. The filter regeneration apparatus according to claim 4, wherein the control means further reduces the supply amount of the microwave as the estimated trapping amount increases. 7. The filter regeneration apparatus according to claim 4, wherein the control means further reduces the air supply amount as the estimated trapping amount increases. 8. The filter regeneration apparatus according to claim 4, wherein the control means operates the air supply means for a longer time as the estimated trapping amount increases.