JPH06173638A - Re-combustion control device for particulate filter - Google Patents

Abstract

PURPOSE:To reduce manufacturing cost by regenerating reliably a particulate filter while preventing a crack or a cinder at re-combustion time, and realizing control of an exhaust gas temperature raising means in simple logic. CONSTITUTION:At filter re-combustion time, a belonging degree in a rule based on a particulate scavenging quantity Qtrap and the time variation equivalence (-) DELTAQtrap is calculated by fuzzy inference, and increase equivalence DELTATref of a target exhaust gas temperature causing no overheat or extinction is inferred from the belonging degree. An intake air throttling quantity is controlled by an intake air throttle valve so that an actual exhaust gas temperature becomes the target exhaust gas temperature found from the increase equivalence DELTATref. In this way, since the intake air throttling quantity is controlled in the optimal value, a filter is kept at a proper temperature, so that the rule or a membership function necessary for the fuzzy inference can be set quite easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reburning control device for a particulate filter, and more particularly, it reburns particulate matter contained in exhaust gas of a diesel engine or the like and collected by the particulate filter. The present invention relates to a reburning control device for regenerating a particulate filter.

[0002]

2. Description of the Related Art As is well known, since particulate matter contained in exhaust gas of a diesel engine is composed of fine carbonized compounds and may be harmful to the human body, a particulate filter for collecting the particulate matter is required. Research is widely conducted. Since this particulate filter tends to gradually block the exhaust passage due to the collection and accumulation of particulates, the particulate filter is reburned by utilizing the property of flammable particulates to regenerate the particulate filter. The device is being researched.

A conventional reburning control device for this type of particulate filter is disclosed in, for example, JP-A-60-216.
Examples thereof include those described in Japanese Patent Laid-Open No. 018.

This re-combustion control system executes intake throttle by an intake valve, retard of fuel injection timing and EGR respectively to reduce the efficiency of the engine, and increases the fuel injection amount to compensate for the reduced amount. , The exhaust gas temperature of the engine is raised to reburn the particulate filter. Then, the intake throttle amount, the retard amount of the fuel injection timing and the EGR rate at this time are constantly controlled to be constant during the re-combustion.

[0005]

As described above, the conventional reburning control device for a particulate filter controls the intake throttle amount, the retard amount, and the EGR rate during reburning to be constant. However, the control amount of these means for raising the exhaust gas temperature has a great influence on the combustion state of particulates, and when these are excessively large, cracks occur in the particulate filter due to overheating, and they are too small. When it is, there is a problem that unburned residue occurs due to disappearance of combustion.

As a countermeasure, for example, it is possible to control the intake throttle amount, the retard amount, and the EGR rate in accordance with the amount of collected particulates and the temporal variation thereof. Causes another problem that the logic becomes complicated and the cost increases.

Therefore, the present invention can prevent cracks due to overheating at the time of re-combustion and the occurrence of unburned residue due to extinguishing, so that the particulate filter can always be reliably regenerated and the exhaust gas temperature rise at the time of re-combustion. An object of the present invention is to provide a reburning control device for a particulate filter, which can realize control of the means by a simple logic and eventually reduce the manufacturing cost.

[0008]

A reburning control device for a particulate filter according to a first aspect of the present invention, as shown in FIG. 1, collects a particulate filter M2 provided in an exhaust passage of an internal combustion engine M1. The collection amount determination means M3 for determining the amount, and the patties collected by raising the exhaust temperature of the internal combustion engine M1 when the collection amount determined by the collection amount determination means M3 is a predetermined value or more. Exhaust temperature raising means M4 for reburning the curate, filter temperature detecting means M5 for detecting the temperature of the particulate filter M2 during the reburn, and particulate filter M2 during the reburn.
In order to prevent overheating and extinction of a plurality of rules, a plurality of rules for setting the target temperature based on the trapped amount and the temporal variation of the trapped amount, and the trapped amount and the trapped amount time in the plurality of rules. A target temperature setting storage unit M6 that stores a function of setting the degree of membership of each set by dividing the dynamic variation into a set of a predetermined range, and the degree of membership of each of the plurality of rules is calculated, and the degree of membership is calculated. Target temperature setting means M7 for setting the target temperature of the particulate filter M2 from
And so that the actual temperature of the particulate filter M2 detected by the filter temperature detecting means M5 becomes the target temperature set by the target temperature setting means M7,
Exhaust temperature control means M8 for controlling the exhaust temperature raising means M4
It is equipped with and.

As shown in FIG. 2, the particulate filter re-combustion control apparatus according to the second aspect of the present invention detects the amount of passing air of the particulate filter M2 provided in the exhaust passage of the internal combustion engine M1. Quantity detecting means M
9, a front-rear differential pressure detecting means M10 for detecting a front-rear differential pressure of the particulate filter M2, a passing air amount detected by the passing air amount detecting means M9, and a front-rear differential pressure detecting means M10. Exhaust gas temperature raising means M4 for raising the exhaust gas temperature of the internal combustion engine M1 and reburning the collected particulates when the trapped amount of the particulate filter M2 determined from the front-rear differential pressure is a predetermined value or more. A filter temperature detecting means M5 for detecting the temperature of the particulate filter M2 during the re-combustion, and the passing air amount and the passing air amount so that the particulate filter M2 during the re-combustion does not overheat or disappear. A plurality of rules for setting the target temperature based on the temporal variation, the front-back differential pressure, and the temporal variation of the front-back differential pressure, and passing air in the plurality of rules. For setting the target temperature that stores the amount, the amount of passing air over time, the differential pressure before and after, and the function over which the amount of change over time of the differential pressure is divided into sets within a predetermined range and the degree of membership of each set is set. A storage unit M6, a target temperature setting unit M7 for calculating the degree of belonging to each of the plurality of rules, and setting the target temperature of the particulate filter from the degree of belonging, and a pattern detected by the filter temperature detecting unit M5. The exhaust temperature control means M8 is provided to control the exhaust temperature raising means M4 so that the actual temperature of the curate filter M2 becomes the target temperature set by the target temperature setting means M7.

According to a third aspect of the present invention, there is provided a particulate filter reburning control device, wherein:
In order that the actual temperature of the particulate filter detected by the filter temperature detecting means becomes the target temperature set by the target temperature setting means, the temperature difference between the actual temperature and the target temperature and the temperature difference A plurality of rules for setting the control amount of the exhaust gas temperature raising means based on a temporal variation, and a temperature difference in the plurality of rules and a temporal variation of the temperature difference are divided into a set of predetermined ranges, and each set Control amount setting storage means for storing a function for setting the degree of affiliation, and control amount setting means for calculating the degree of affiliation in each of the plurality of rules and setting the control amount of the exhaust gas temperature raising means from the degree of affiliation And is equipped with.

[0011]

In the inventions of claims 1 and 2, the trapped amount of the particulate filter M2 provided in the internal combustion engine M1 is judged by the trapped amount judging means M3, or the passing air amount detecting means. It is judged from the amount of passing air detected by M9 and the front-rear differential pressure detected by the front-rear differential pressure detection means M10. When the trapped amount is equal to or more than a predetermined value, the exhaust temperature of the internal combustion engine M1 is increased by the exhaust temperature raising means M4. The temperature is raised, and the reburning of particulates is started. At the time of this re-combustion, a rule based on the trapped amount of the particulate filter M2 stored in the target temperature setting storage means M6 and its temporal variation, or the particulate filter M
The degree of belonging in the rule based on the amount of passing air of 2 and its temporal variation and the differential pressure before and after and its temporal variation is calculated by the target temperature setting means M7, and overheating or extinction does not occur from the degree of belonging. Particulate filter M2
The target temperature of is set. Then, the exhaust gas temperature control device M8 controls the exhaust gas temperature raising device M4 so that the actual temperature of the particulate filter M2 detected by the filter temperature detection device M5 becomes the target temperature described above.

Therefore, when the amount of the particulate filter M2 collected gradually decreases with the progress of reburning,
The exhaust gas temperature raising means M4 is controlled to an optimum control amount according to the occasion, the particulate filter M2 is always kept at an appropriate temperature, and cracks due to overheating and unburned residue due to extinction are prevented from occurring. . Since the rules and functions necessary for setting the target temperature can be set very easily, the control of the exhaust gas temperature raising means M4 can be realized by an extremely simple logic.

According to the third aspect of the invention, the degree of belonging to each rule stored in the controlled quantity setting storage means is calculated by the controlled quantity setting means, and the actual temperature of the particulate filter is calculated from the belonging degree as the target temperature. Is set, and the exhaust gas temperature raising means is controlled. And
Similar to the setting of the target temperature, the rules and functions necessary for setting the control amount of the exhaust gas temperature raising means can be set very easily, so that the control of the exhaust gas temperature raising means can be realized by a simpler logic. .

[0014]

EXAMPLES Examples of the present invention will be described below.

FIG. 3 is a schematic configuration diagram showing a reburning control device for a particulate filter which is an embodiment of the present invention.

As shown in the figure, the diesel engine 1 is operated by the fuel supplied from the fuel injection pump 9, and the engine speed Ne during operation is detected by the engine speed sensor 2. An intake passage 3 of the diesel engine 1 is provided with an air cleaner 4, an intake pressure sensor 5 for detecting an intake pressure Pm0, and an intake temperature sensor 6 for detecting an intake temperature TH, and the intake passage 3 is driven by a stepper 10. The opening degree is adjusted by the throttle valve 11. A particulate filter 8 for collecting particulates in the exhaust gas is provided in the exhaust passage 7 of the diesel engine 1, and the pressure of the exhaust gas (hereinafter, simply referred to as “ A front pressure sensor 15 and a rear pressure sensor 16 for detecting a front pressure Pm1 and a “rear pressure Pm2” are provided, and an exhaust temperature sensor 17 for detecting an exhaust temperature Tex is provided downstream of the filter 8. .

The intake throttle valve 11 is provided to raise the exhaust temperature of the diesel engine 1 and reburn the particulate filter 8.
That is, as is well known, when the intake air amount is limited by the intake throttle valve 11, the diesel engine 1 has a reduced combustion efficiency and requires more fuel under the same conditions. If the fuel injection amount is increased in order to maintain the same engine torque as when the intake throttle valve 11 is fully opened, the increased amount can be spent to raise the exhaust gas temperature to reburn the particulate filter 8. You can do it. The exhaust gas temperature referred to here is the temperature of the exhaust gas discharged from the diesel engine 1, and the filter 8 detected by the exhaust gas temperature sensor 17 is used.
It is handled separately from the exhaust temperature Tex on the downstream side (which is regarded as the temperature of the filter 8 itself).

The sensors such as the rotational speed sensor 2, the intake pressure sensor 5, the intake temperature sensor 6, the front pressure sensor 15, the rear pressure sensor 16 and the exhaust temperature sensor 17, the fuel injection pump 9 and the stepper 10 are described. Each of the actuators such as is connected to an electronic control unit 18 (hereinafter, simply referred to as “ECU”) that controls the operation of the reburning control unit, and the ECU 18 is connected to the accelerator depression amount ACCP of the vehicle.
An accelerator sensor 12 for detecting the is also connected.

FIG. 4 is a schematic configuration diagram showing an ECU of a reburning control device for a particulate filter which is an embodiment of the present invention.

As shown in the figure, the ECU 18 includes a central processing unit 19 (hereinafter simply referred to as "CPU"), a read-only memory 20 (hereinafter simply referred to as "ROM"), and a random access memory 21 (hereinafter simply referred to as "CPU"). RAM ”), an input circuit 22 and an output circuit 23. The CPU 19 inputs signals from each sensor via the input circuit 22, executes arithmetic processing according to a program stored in the ROM 20 in advance, and drives each actuator via the output circuit 23 based on the arithmetic result. Further, the RAM 21 temporarily stores data during the calculation of the CPU 19 and calculation results. The details are not explained,
The CPU 19 of this embodiment adjusts the fuel injection amount and the fuel injection timing of the fuel injection pump 9 based on the signal from each sensor as well as the control of the reburning control device, and also controls the operation of the diesel engine 1 itself. .

Next, the processing executed by the CPU 19 of the reburning control device for the particulate filter 8 thus configured will be described. In addition, as the processing of the CPU 19,
The process for determining the regeneration time of the particulate filter 8 and the process for controlling the regeneration can be roughly classified. First, the regeneration time determination process will be described.

FIG. 5 is a flowchart showing a filter regeneration timing determination routine executed by the CPU of the particulate filter reburning control apparatus according to an embodiment of the present invention.

The routine shown in the figure is executed at predetermined time intervals, for example, 1
It is activated every second. In step S100, the CPU 19 determines whether or not the regeneration request flag F is set, and when it is set, this routine is once ended in order to execute the regeneration control of the particulate filter 8. When the regeneration request flag F is cleared, a drive signal is output to the output circuit 23 of the ECU 18 in step S101, and the stepper 10 causes the intake throttle valve 11 to operate.
Keep it fully open. Therefore, the diesel engine 1 is maintained in a normal operating state without causing a decrease in combustion efficiency due to the restriction of intake air, and the exhaust gas thereof collects particulates when passing through the particulate filter 8 and is discharged to the outside. To be done.

Next, the CPU 19 executes the calculation processing of the particulate trapped amount Qtrap in the processing after step S102. First, in step S102, the intake air amount U0 of the diesel engine 1 is calculated from the engine speed Ne detected by the speed sensor 2 and the intake pressure Pm0 detected by the intake pressure sensor 5 as shown in the following equation. calculate.

U0 = f (Ne, Pm0) Further, in consideration of the volume expansion due to combustion in the diesel engine 1 in step S103, the intake air amount U0 and the front pressure sensor 15 are detected as shown in the following equation. Pre-pressurized P
The amount U of air passing through the particulate filter 8 is calculated from m1 and the exhaust temperature Tex detected by the exhaust temperature sensor 17.

U = f (U0, Pm1, Tex) Then, in step S104, as shown in the following equation, the pre-pressure P
The differential pressure ΔP across the particulate filter 8 is calculated from m1 and the post pressure Pm2 detected by the post pressure sensor 16.

ΔP = Pm1−Pm2 Then, in step S105, as shown in the following equation, the amount of particulate collection Q is calculated from the passing air amount U and the front-rear differential pressure ΔP.
Calculate trap.

Qtrap = f (U, ΔP) In other words, the filter 8 becomes clogged with an increase in the amount of trapped particulate Qtrap, the passing air amount U tends to decrease, and the front-rear differential pressure ΔP tends to increase. Since it fluctuates, the trapped amount Qtrap is calculated using this phenomenon.

Next, the CPU 19 determines in step S106 whether the calculated particulate collection amount Qtrap has exceeded a preset limit collection amount Qreg preset as the collection amount near the limit of the particulate filter 8. Then
If it is less than or equal to the set limit collection amount Qreg (Qtrap ≦ Qreg), the regeneration request flag F is cleared in step S107 because the regeneration process is not yet required, and this routine is finished. When the particulate collection amount Qtrap exceeds the set limit collection amount Qreg (Qtrap> Qreg),
Since the reproduction process is required, the process proceeds to step S108.

Then, in step S108, it is determined whether or not the current exhaust gas temperature Tex is less than a preset limit exhaust gas temperature Treg preset as a temperature near the limit that the particulate filter 8 can withstand, and the temperature is equal to or more than the set limit exhaust gas temperature Treg. (Tex ≧
At the time of (Treg), the particulate filter 8 is already at a high temperature, and if the regeneration process is executed, cracking may occur due to overheating, and the regeneration request flag F is cleared in step S107. When the exhaust temperature Tex is less than the set limit exhaust temperature Treg (Tex <Treg), it is determined that the temperature of the filter 8 is not so high that the regeneration process can be executed, the regeneration request flag F is set in step S109, and this routine is executed. To finish.

Next, the reproduction control process of the particulate filter 8 executed by the CPU 19 will be described.

FIG. 6 is a flowchart showing a filter regeneration control routine executed by the CPU of the particulate filter reburning control apparatus according to one embodiment of the present invention.

The routine shown in the figure is executed at predetermined time intervals, for example, 1
It is activated every second. In step S200, the CPU 19 determines whether or not the regeneration request flag F is set, and when it is cleared, it is determined that the regeneration process of the particulate filter 8 is not necessary, and this routine is once ended. Further, when the regeneration request flag F is set, the particulate collection amount Qtrap is determined in step S201.
To calculate. Although not described in detail, this calculation process is performed in step S102 of the filter regeneration timing determination routine described above.
The procedure is similar to that of step S105. In this case, the amount of trapped particulate Qtrap
Represents the remaining amount that has not yet been burned and is collected by the particulate filter 8, and gradually decreases with the progress of reburning.

Next, in step S202, the CPU 19 determines whether or not the particulate collection amount Qtrap of the calculation result exceeds 0, and when it exceeds 0 (Qtrap>
0) has a remaining amount and the regeneration process of the particulate filter 8 is not completed, and in step S203, the particulate trapped amount Qtrap and its temporal variation −ΔQ.
trap (the trapped amount Qtrap during the regeneration process is always in the decreasing direction as described above, and therefore has a negative value), as will be described later, fuzzy reasoning causes cracks due to overheating of the particulate filter 8 and unburned residue due to extinction. A target exhaust gas temperature Tref that does not cause the above is calculated.

Further, in step S204, the temperature difference e is calculated from the target exhaust gas temperature Tref and the actual exhaust gas temperature Tex as shown in the following equation.

E = Tref-Tex Then, in step S205, the actual exhaust gas temperature Tex is made to approach the target exhaust gas temperature Tref by fuzzy inference as will be described later from the temperature difference e and its temporal variation Δe, and the temperature difference e is obtained.
The intake throttle amount θ that converges to 0 is calculated. Here, the intake throttle amount θ is a control amount indicating how much the intake throttle valve 11 is closed from the fully open state. Then, step S2
At 06, the intake throttle amount θ is converted into a drive signal for the stepper 10 and output to the output circuit 23, and the stepper 10 drives the intake throttle valve 11 to have an opening corresponding to the intake throttle amount θ.

By the above processing, the intake air amount is limited by the intake throttle valve 11, and the combustion efficiency of the diesel engine 1 is reduced. Then, at this time, in order to maintain the same engine torque, the fuel injection amount control routine, which will be described later, increases and corrects the fuel injection amount, and the increased amount is spent to raise the exhaust gas temperature, and the reburning of the particulate filter 8 is performed. Be started.

By this regenerating process, the particulate collection amount Qtrap gradually decreases, and when the particulate collection amount Qtrap becomes 0 or less (Qtrap ≦ 0) in the step S202, the process shifts to step S207 and the regeneration request flag F.
Is cleared and this routine ends. Therefore, C
PU19 is step S of the filter regeneration timing determination routine.
From 100 to step S101, the intake throttle valve 1
Hold 1 in the fully open position. Therefore, the restriction of the intake air amount is released, the exhaust gas temperature of the diesel engine 1 is lowered, and the diesel engine 1 returns to the normal operating state, and the particulate filter 8 starts collecting the particulates again.

As described above, during the regeneration process, when the particulate collection amount Qtrap gradually decreases as the re-combustion progresses, the optimum intake throttle amount θ corresponding to each time is sequentially obtained in steps S203 to S205. The opening of the intake throttle valve 11 is calculated and controlled. Therefore, the particulate filter 8 during regeneration is always kept at an appropriate temperature, and cracks due to overheating and unburned residue due to extinction are prevented from occurring.

On the other hand, the procedure of fuzzy inference of the target exhaust gas temperature Tref executed in step S203 will be described.

FIG. 7 is an explanatory diagram showing rules for fuzzy inference of the target exhaust gas temperature increment of the particulate filter reburning control apparatus according to an embodiment of the present invention, and FIG. 8 is an embodiment of the present invention. It is explanatory drawing which shows the membership function at the time of carrying out fuzzy inference about the increase of the target exhaust temperature of the reburning control apparatus of a certain particulate filter.

The target exhaust temperature Tref is calculated by obtaining the increment ΔTref by fuzzy reasoning and sequentially adding it as shown in the following equation.

Tref = Tref + ΔTref Further, the increment ΔTref of the target exhaust gas temperature Tref is set by a rule executed based on the particulate trapped amount Qtrap and its temporal variation −ΔQtrap. As shown below, this rule is expressed by a logical expression rather than a mathematical expression, and in this rule, the amount of trapped particulate trap Qtrap and its temporal variation −ΔQtrap are zero (Z), middle (M), It is expressed in three stages of large (B), and the increment ΔTref of the target exhaust temperature Tref is negatively large (NB), negatively small (NS), zero (Z), positively small (PS), and positive. It is expressed in 5 levels of large (PB). Then, for example, the amount of trapped particulate Qtrap
Is large (B) and the temporal variation −ΔQtrap is zero (Z), the increment ΔTref of the target exhaust temperature Tref is set to a positive and large (PB) value, and is expressed as follows.

IF Qtrap = B & −ΔQtrap = Z
THEN ΔTref = PB A plurality of such rules are created and collectively expressed as shown in FIG. 7. The rule in the above example corresponds to the thick line portion in the figure. These rules are set so that the optimum target exhaust temperature Tref that can prevent cracks due to overheating and unburned residue due to extinction of combustion can be inferred when the particulate filter 8 is regenerated.

In the case of the above classification, the membership function representing the degree (grade) of the particulate trapped amount Qtrap, its temporal variation −ΔQtrap, and the increment ΔTref of the target exhaust temperature Tref to each stage. Is as shown in FIG. Here, input variables Qt1, Qt2, −ΔQt1, −
ΔQt2, −ΔT1, −ΔT2, ΔT3, ΔT4 are values determined in advance according to the characteristics of the diesel engine 1 and the particulate filter 8. The above rules and membership functions are stored in the ROM 20 in advance, and the fuzzy reasoning is executed by the CPU 19 based on these rules.

Here, the procedure for fuzzy inference of the target exhaust gas temperature Tref will be described with reference to the flowchart of FIG.

FIG. 9 is a flow chart showing a target exhaust temperature calculation routine executed by the CPU when fuzzy inferring the target exhaust temperature increment of the particulate filter reburning control apparatus according to one embodiment of the present invention. FIG. 14 is an explanatory diagram showing an inference example when fuzzy inference is performed on the target exhaust gas temperature increase of the particulate matter reburning control apparatus according to the embodiment of the present invention. Here, FIGS.
FIG. 10 shows rules used for inference, FIG. 11 shows rules, FIG. 12 shows rules, FIG. 13 shows rules, and FIG. 14 shows these rules. It shows the inference result based on.

Now, the amount of trapped particulate Qtrap is x which belongs to both zero (Z) and medium (M), and its temporal variation −ΔQtrap is both medium (M) and large (B). Infer the increment ΔTref of the target exhaust gas temperature Tref, assuming that y belongs to y.

Step S2 of the filter regeneration control routine
When the target exhaust temperature calculation routine is called in 03, CP
U19 is the particulate collection amount Q in step S300.
A set (zero (Z) and medium (M)) to which trap is applied is selected, and a set (medium (M) and large (B)) to which temporal variation −ΔQtrap is applied is selected in step S301. Next, in step S302, the corresponding rule is executed to select the degree of belonging of the increment ΔTref of the target exhaust temperature Tref in each rule.

That is, a rule or a rule including both the above-mentioned set of the particulate collection amount Qtrap and its temporal variation −ΔQtrap is selected and executed.

IF Qtrap = Z & −ΔQtrap = M THEN
ΔTref = NS IF Qtrap = M & −ΔQtrap = B THEN
ΔTref = Z IF Qtrap = Z & −ΔQtrap = B THEN
ΔTref = NB IF Qtrap = M & −ΔQtrap = M THEN
ΔTref = Z Here, as shown in FIGS. 10 to 13, in the rule, the degree of belonging of the particulate trapped amount Qtrap is zero (Z) is 0.7, and its temporal variation −ΔQtrap is medium ( The degree of affiliation of M) is 0.8, and the resulting degree of increment ΔTref of the target exhaust temperature Tref is negative and small (NS) is 0.7, which is the smaller of the two degrees of affiliation. .
Similarly, according to the rule, the degree of belonging of the particulate trapped amount Qtrap is medium (M) is 0.3, the degree of temporal variation −ΔQtrap is large (B) is 0.2, and
The degree of belonging where the resulting increase ΔTref of the target exhaust temperature Tref is zero (Z) is 0.2 which is the smaller of the two degrees of belonging. In addition, according to the rule, the degree of belonging when the amount of trapped particulate Qtrap is zero (Z) is 0.7, and the degree of belonging of the time variation −ΔQtrap is large (B) is 0.2. Increment ΔT of target exhaust temperature Tref
The degree of belonging in which ref is negative and large (NB) is 0.2 which is the smaller of the two degrees of belonging. Further, according to the rule, the degree of belonging of the particulate collection amount Qtrap is medium (M) is 0.3, and the temporal variation-ΔQtrap is the degree of belonging of medium (M) is 0.8. The degree of belonging in which the increment ΔTref of the resulting target exhaust temperature Tref is zero (Z) is 0.3, which is the smaller of the two degrees of belonging.

Thereafter, the CPU 19 synthesizes the rule or the result of the rule as a figure in step S303, obtains the center of gravity of the figure after synthesis in step S304, and terminates this routine. As a result, as shown in FIG. 14, a value z is inferred as the increment ΔTref of the target exhaust temperature Tref, and the target exhaust temperature Tref is calculated based on the increment ΔTref.

Next, the procedure of fuzzy inference of the intake throttle amount θ executed in step S205 will be described.

FIG. 15 is an explanatory view showing a rule when fuzzy inference is made on the increment of the intake throttle amount of the reburning control device for the particulate filter which is one embodiment of the present invention, and FIG. 16 is one embodiment of the present invention. It is explanatory drawing which shows the membership function at the time of carrying out fuzzy inference about the increment of the intake throttle amount of the reburning control apparatus of a certain particulate filter.

The intake throttle amount θ is calculated by obtaining the increment Δθ by fuzzy reasoning and sequentially adding it as shown in the following equation.

Θ = θ + Δθ Further, the increment Δθ of the intake throttle amount θ is set by a rule executed based on the temperature difference e between the target exhaust gas temperature Tref and the actual exhaust gas temperature Tex, and its temporal variation Δe. It In this rule, the temperature difference e, its time variation Δe, and the increment Δθ of the intake throttle amount θ are large in the negative (NB), small in the negative (NS), zero (Z), small in the positive (PS),
It is expressed in five steps of positive and large (PB). For example, when the temperature difference e is positive and large (PB) and the temporal variation Δe is negative and large (NB), the intake throttle amount θ Increment Δ
Let θ be zero (Z), and express as follows.

IF e = PB & Δe = NB THEN Δθ = Z A plurality of such rules are created and collectively expressed as shown in FIG. The rule in the above example corresponds to the thick line portion in the figure. And these rules are
The actual exhaust gas temperature Tex is set close to the target exhaust gas temperature Tref so that the intake throttle amount θ that can converge the temperature difference e to 0 can be inferred.

When divided as described above, the membership function representing the degree of belonging to each stage of the temperature difference e, the time variation Δe thereof, and the increment Δθ of the intake throttle amount θ is as shown in FIG. Become. Here, input variables -e1, -e2, e3, e4,
−Δe1, −Δe2, Δe3, Δe4, −Δθ1, −Δθ2, Δθ3,
Δθ4 is a value determined in advance according to the characteristics of the diesel engine 1 and the particulate filter 8. The above rules and membership functions are stored in the ROM 2 in advance.
0, and the fuzzy inference is executed by the CPU 19 based on these.

Now, the procedure of fuzzy inference of the intake throttle amount θ will be described with reference to the flowchart of FIG.

FIG. 17 is a flow chart showing an intake throttle amount calculation routine executed by the CPU when fuzzy inference is performed on the intake throttle amount increment of the particulate filter reburning control apparatus according to one embodiment of the present invention. It is explanatory drawing which shows the inference example at the time of carrying out fuzzy inference about the increase of the intake throttle amount of the reburning control apparatus of the particulate filter which is one Example of this invention.

Now, the target exhaust temperature Tref and the actual exhaust temperature Tex
The temperature difference e with x belongs to both negative and small (NS) and zero (Z), and its temporal variation Δe belongs to both positive and small (PS) and positive and large (PB). Infer the increment Δθ of the intake throttle amount θ.

Step S2 of the filter regeneration control routine
When the intake throttle amount calculation routine is called in 05, CP
In step S400, U19 selects a set (negative and small (NS) and zero (Z)) to which the temperature difference e is applied, and in step S401, a set to which the temporal variation Δe is applied (positive and small (PS) and positive and large). (PB)) is selected. Then, in step S402, execute the corresponding rule,
The degree of belonging of the increment Δθ of the intake throttle amount θ in each rule is selected.

That is, a rule and a rule including both the set of the temperature difference e and the temporal variation Δe thereof are selected and executed.

IF e = NS & Δe = PS THEN Δθ
= Z IF e = Z & Δe = PB THEN Δθ
= PS Here, as shown in FIG. 18, in the rule, the degree of belonging of the temperature difference e is negative and small (NS) is 0.7, and the degree of temporal variation Δe thereof is positive and small (PS). Is 0.2
The resulting degree of belonging where the increment Δθ of the intake throttle amount θ is zero (Z) is 0.2 which is the smaller of the two degrees of belonging. Similarly, in the rule, the temperature difference e
Is zero (Z), the degree of belonging is 0.3, and its temporal variation Δe
Is positive and is large (PB), the degree of belonging is 0.8, and the resulting degree of increase Δθ of the intake throttle amount θ is positive and small (PS) is the smaller of the two degrees of belonging. Set to 0.3.

Thereafter, the CPU 19 synthesizes the rule and the result of the rule as a figure in step S403, obtains the center of gravity of the figure after synthesis in step S404, and ends this routine. As a result, a value of z is inferred as the increment Δθ of the intake throttle amount θ, and the intake throttle amount θ is calculated based on the increment Δθ.

As described above, the target exhaust gas temperature Tref of the particulate filter 8 during regeneration and the intake throttle amount θ required to bring the actual exhaust gas temperature Tex close to the target exhaust gas temperature Tref.
And are both obtained by fuzzy reasoning. And, as is well known, the rules and membership functions necessary for implementing fuzzy inference can be set very easily,
The control of the intake throttle amount θ by the intake throttle valve 11 can be realized by an extremely simple logic.

Next, the above particulate filter 8
A fuel injection amount control routine executed to maintain the engine torque at the time of re-combustion will be described.

FIG. 19 is a flowchart showing a fuel injection amount control routine executed by the CPU of the particulate filter reburning control apparatus according to the embodiment of the present invention.
Is an explanatory view showing the characteristic of the basic fuel injection amount of the reburning control device of the particulate filter which is one embodiment of the present invention,
FIG. 21 is an explanatory diagram showing the characteristics of the intake throttle correction coefficient of the reburning control device for a particulate filter that is an embodiment of the present invention.

The routine shown in the figure is the diesel engine 1
Is started in synchronism with the rotation (injection timing) or in every cycle sufficiently shorter than the injection timing. CPU19
Is the rotational speed sensor 2 in step S500 as shown in the following equation.
The basic fuel injection amount Q0 is calculated from the engine speed Ne detected in step S1 and the accelerator depression amount ACCP detected in the accelerator sensor 12.

Q0 = f (Ne, ACCP) The characteristic of the calculated basic fuel injection amount Q0 is, for example, as shown in FIG.
The basic fuel injection amount Q0 corresponds to the injection amount when the intake air amount is not limited by the intake throttle valve 11.

Next, the CPU 19 carries out step S501.
Then, the intake throttle correction coefficient K is calculated from the intake throttle amount θ calculated in step S205 of the filter regeneration control routine as shown in the following equation.

K = f (θ) Then, in step S502, the final fuel injection amount Q is calculated from the basic fuel injection amount Q0 and the intake throttle correction coefficient K.

Q = K × Q0 As shown in FIG. 21, the intake throttle correction coefficient K is set to 1 when the intake throttle amount θ is 0 (the intake throttle valve 11 is in the fully open state). As the fuel injection amount Q, the basic fuel injection amount Q0 is applied as it is, and the diesel engine 1 is maintained in a normal operating state. Further, since the intake throttle correction coefficient K is also set to increase with the increase of the intake throttle amount θ, the final fuel injection amount Q at this time is increased and corrected, and the intake air amount is limited, so that the diesel engine 1 Even if the combustion efficiency decreases, the same engine torque is maintained. Then, as described above, the increased amount of the fuel injection amount is spent to raise the exhaust gas temperature, and the reburning of the particulate filter 8 is performed.

As described above, in this embodiment, the internal combustion engine M1
The diesel engine 1 functions as, and the particulate filter 8 serves as the particulate filter M2.
The CPU 19 when executing the processing of steps S102 to S105 and step S201 functions as the collection amount determination means M3, and the stepper 10 and the intake throttle valve 11 function as the exhaust gas temperature increasing means M4. Further, the exhaust gas temperature sensor 17 as the filter temperature detection means M5, the ROM 20 as the target temperature setting storage means M6, the CPU 19 as the target temperature setting means M7 when executing the processing of step S203, and the exhaust gas temperature control means M8 as the step S2
CP when executing the processing from 04 to step S206
Each U19 works.

Further, a ROM is used as a control amount setting storage means.
20 functions, and as a control amount setting means, step S205
The CPU 19 functions when executing the processing of.

As described above, the particulate filter reburning control apparatus of this embodiment is provided in the exhaust passage 7 by limiting the intake air amount of the diesel engine 1 by the intake throttle valve 11 to raise the exhaust temperature. A stepper 10 for reburning the particulates of the particulate filter 8;
Exhaust temperature T of the particulate filter 8 during the reburning
The exhaust gas temperature sensor 17 for detecting ex and the particulate collection amount Qtrap of the particulate filter 8 and its temporal variation −ΔQtrap are set so that the particulate filter 8 is not overheated or extinguished during the reburning. A plurality of rules for setting the target exhaust temperature Tref based on
Amount of particulate collection Qtr in the plurality of rules
ROM for storing ap and its temporal variation −ΔQtrap into sets in a predetermined range and a membership function for setting the degree of membership of each set, and the amount of trapped particulate Qtrap is calculated to capture When the collection amount Qtrap is equal to or more than a predetermined value, the stepper 10 drives the intake throttle valve 11 to reburn the particulate filter 8 and
The degree of belonging to each of the plurality of rules stored in the ROM 20 is calculated, and the target exhaust temperature T is calculated from the degree of belonging.
CPU 19 which sets ref and controls the intake throttle amount θ by the intake throttle valve 11 so that the actual exhaust temperature Tex of the particulate filter 8 detected by the exhaust temperature sensor 17 becomes the target exhaust temperature Tref. It has and. This structure corresponds to the embodiment of the invention of claim 1.

Therefore, when the particulate collection amount Qtrap gradually decreases as the reburning progresses, the intake air throttle amount θ is controlled to an optimum value depending on the occasion, and the particulate filter 8 is always maintained at an appropriate temperature. Be drunk Therefore, it is possible to prevent cracks due to overheating of the particulate filter 8 and unburned residue due to extinction, and always reliably reproduce.

Moreover, since the target exhaust temperature Tref of the particulate filter 8 being regenerated is obtained by fuzzy inference, the rules and membership functions necessary for carrying out the fuzzy inference can be set very easily. As a result, the control of the intake throttle amount θ can be realized by an extremely simple logic, and thus the manufacturing cost of the reburning control device can be reduced.

Further, the particulate filter reburning control apparatus of the present embodiment is designed so that the actual exhaust temperature Tex of the particulate filter 8 detected by the exhaust temperature sensor 17 becomes the target exhaust temperature Tref. A plurality of rules for setting the intake throttle amount θ based on the temperature difference e between the exhaust temperature Tex and the target exhaust temperature Tref and the time variation Δe of the temperature difference e, and the temperature difference e and the time thereof in the plurality of rules. A ROM 20 that stores the dynamic variation Δe into a set within a predetermined range and stores a membership function that sets the degree of membership of each set.
And a CPU 19 that calculates the degree of belonging to each of a plurality of rules stored in the ROM 20 and sets the intake throttle amount θ from the degree of belonging. This structure corresponds to the third embodiment of the invention.

Therefore, since the intake throttle amount θ for making the actual exhaust gas temperature Tex of the particulate filter 8 during regeneration the target exhaust gas temperature Tref is obtained by fuzzy inference, it is necessary to carry out the fuzzy inference. Rules and membership functions can be set very easily. As a result, the control of the intake throttle amount θ can be realized by an even simpler logic, and further, the manufacturing cost of the reburning control device can be further reduced.

By the way, in the above embodiment, the amount of trapped particulate Qtrap is calculated from the amount of air U passing through the particulate filter 8 and the differential pressure ΔP between the front and rear, and the amount of trapped particulate Qtrap and its temporal variation −ΔQtrap. The target exhaust temperature Tref was calculated by fuzzy inference based on the above.
However, the target exhaust temperature Tre using fuzzy reasoning
The inference procedure of f is not limited to this. For example, the calculation process of the trapped amount Qtrap of particulates may be omitted, and fuzzy inference may be performed based on the amount U of air passing through the particulate filter 8 and the differential pressure ΔP across the filter. It is also possible to directly calculate the target exhaust temperature Tref.

The case of executing this inference procedure will be described below. In this case, the ROM 20 at this time is previously stored in the ROM 20 with the passing air amount U and the passing air amount U of the particulate filter 8.
A plurality of target exhaust gas temperatures Tref are set based on the time variation of the differential pressure ΔP and the time variation of the front-rear differential pressure ΔP and the front-rear differential pressure ΔP so that the particulate filter 8 does not overheat or disappear during reburning. Rules (corresponding to FIG. 7 of the above embodiment) and the passing air amount U in these rules,
The temporal variation, the front-rear differential pressure ΔP, and the membership function (corresponding to FIG. 8 of the above embodiment) that sets the degree of belonging by dividing the temporal variation into a set in a predetermined range are stored. . Then, the CPU 19 calculates the degree of belonging to each rule and infers the target exhaust gas temperature Tref of the particulate filter 8 from the degree of belonging according to the same procedure as that of FIG. 9 of the above embodiment.

In this alternative example, the CPU 19 at the time of executing the processing of steps S102 and S103 of FIG. 5 described in the above embodiment functions as the passing air amount detecting means M9, and the front-rear differential pressure detecting means M10. As a result, the CPU 19 functions when executing the process of step S104.

As described above, the reburning control device for the particulate filter using another example of the fuzzy reasoning is as follows.
The intake throttle valve 11 limits the intake air amount of the diesel engine 1 to raise the exhaust temperature, and re-combusts the particulates of the particulate filter 8 provided in the exhaust passage 7. Exhaust gas temperature sensor 1 for detecting the exhaust gas temperature Tex of the particulate filter 8
In order to prevent overheating and extinction of the particulate filter 8 during the re-combustion, the passing air amount U of the particulate filter 8 and the temporal variation of the passing air amount U and the front-back differential pressure ΔP and the front-back difference. A plurality of rules for setting the target exhaust temperature Tref based on the temporal variation of the pressure ΔP, the passing air amount U in the plurality of rules, the temporal variation thereof, the front-rear differential pressure ΔP and the temporal variation thereof. A ROM 20 that stores a membership function that divides the set into a set of predetermined ranges and sets the degree of belonging to each set, and the amount of trapped particulate Qtrap from the passing air amount U and the differential pressure ΔP across
When the trapped amount Qtrap is equal to or more than a predetermined value, the stepper 10 drives the intake throttle valve 11 to reburn the particulate filter 8 and the RO
The degree of belonging to each of the plurality of rules stored in M20 is calculated, the target exhaust temperature Tref is set from the degree of belonging, and the actual exhaust temperature Tex of the particulate filter 8 detected by the exhaust temperature sensor 17 is set. So as to become the target exhaust temperature Tref. This constitution corresponds to the embodiment of the invention of claim 2.

Therefore, as in the above embodiment, the intake throttle amount θ during re-combustion is controlled to an optimum value to prevent cracks and unburned residue from occurring in the particulate filter 8 and always reproduce reliably. be able to. Moreover, since the rules and membership functions necessary for fuzzy inference of the target exhaust temperature Tref can be set very easily, the intake throttle amount θ can be realized with extremely simple logic, and the manufacturing cost of the reburning control device can be reduced. You can

On the other hand, in the above-mentioned embodiment, the target exhaust gas temperature Tref is inferred based on the amount of trapped particulate Qtrap and its temporal variation −ΔQtrap. However, in addition, temporal variation −ΔQtrap temporal variation − Considering Δ ² Qtrap, the target exhaust gas temperature Tref may be inferred by setting a rule such as IF Qtrap = B & −ΔQtrap = Z & −Δ ² Qtrap = Z THEN ΔTref = PB.

Similarly, in the above embodiment, the target exhaust temperature Tre
The intake throttle amount θ by the intake throttle valve 11 was inferred based on the temperature difference e between f and the actual exhaust temperature Tex and the temporal variation Δe of the temperature difference e. Considering the variation Δ ² e, for example, IF e = PB & Δe = NS & Δ ² e = Z T
The intake throttle amount θ may be inferred by setting a rule such as HEN Δθ = Z.

Then, in this way, a new time variation
By considering Δ ² Qtrap and Δ ² e with respect to time variation, it is possible to improve the inference accuracy of the target exhaust temperature Tref and the intake throttle amount θ.

Further, in the above embodiment, the exhaust temperature of the diesel engine 1 is raised by limiting the intake air amount of the diesel engine 1 by the intake throttle valve 11, but when the present invention is carried out, this Is not limited to
The point is that it is possible to intentionally reduce the efficiency of the engine and reach the operating state in which the fuel injection amount needs to be increased. Therefore, various means other than the intake throttle can be used. For example, pumping loss may be increased by limiting the exhaust gas with an exhaust throttle valve to reduce the efficiency of the engine. Further, the efficiency of the engine may be reduced by retarding the fuel injection timing or executing EGR.

[0090]

As described above, according to the reburning control device for a particulate filter of the inventions of claims 1 and 2, cracks due to overheating are always maintained at an appropriate temperature for the particulate filter during reburning. It is possible to prevent the occurrence of unburned residue or the like due to the disappearance or disappearance, and always reliably reproduce. Moreover, since the rules and functions necessary for setting the target temperature can be set very easily, the control of the exhaust gas temperature raising means can be realized by an extremely simple logic, which in turn reduces the manufacturing cost of the reburning control device. it can.

Further, according to the reburning control device for a particulate filter of the third aspect of the invention, the rules and functions necessary for setting the control amount of the exhaust gas temperature raising means can be set very easily. The control of the raising means can be realized by a simpler logic, and further, the manufacturing cost of the reburning control device can be further reduced.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram conceptually showing the contents of an embodiment corresponding to the invention of claim 1.

FIG. 2 is a claim correspondence diagram conceptually showing the contents of an embodiment corresponding to the invention of claim 2.

FIG. 3 is a schematic configuration diagram showing a reburning control device for a particulate filter that is an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing an ECU of a reburning control device for a particulate filter according to an embodiment of the present invention.

FIG. 5 is a flowchart showing a filter regeneration timing determination routine executed by the CPU of the particulate filter reburning control apparatus according to an embodiment of the present invention.

FIG. 6 is a flowchart showing a filter regeneration control routine executed by the CPU of the particulate filter reburning control apparatus according to an embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a rule when fuzzy inference is performed on the target exhaust gas temperature increment of the particulate filter reburning control apparatus according to an embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a membership function when performing a fuzzy inference on the target exhaust temperature increment of the particulate matter reburning control apparatus according to the embodiment of the present invention.

FIG. 9 is a flowchart showing a target exhaust temperature calculation routine executed by a CPU when fuzzy inferring an increase in a target exhaust temperature of a particulate filter reburning control apparatus according to an embodiment of the present invention.

FIG. 10 is an explanatory diagram showing an inference example when performing a fuzzy inference on the increment of the target exhaust gas temperature of the reburning control device for the particulate filter according to the embodiment of the present invention.

FIG. 11 is an explanatory diagram showing an inference example when performing a fuzzy inference on the target exhaust gas temperature increment of the reburning control device for a particulate filter according to an embodiment of the present invention.

FIG. 12 is an explanatory diagram showing an inference example when performing a fuzzy inference on the target exhaust gas temperature increase of the particulate matter filter reburning control apparatus according to an embodiment of the present invention.

FIG. 13 is an explanatory diagram showing an inference example when performing a fuzzy inference on the target exhaust temperature increment of the reburning control device for a particulate filter according to an embodiment of the present invention.

FIG. 14 is an explanatory diagram showing an inference example when performing a fuzzy inference on the target exhaust temperature increment of the reburning control device for a particulate filter according to an embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a rule when fuzzy inference is performed on the increment of the intake throttle amount of the reburning control device for the particulate filter according to the embodiment of the present invention.

FIG. 16 is an explanatory diagram showing a membership function when performing a fuzzy inference on the increment of the intake throttle amount of the reburning control device for the particulate filter according to the embodiment of the present invention.

FIG. 17 is a flowchart showing an intake throttling amount calculation routine executed by the CPU when fuzzy inferring an increase in the intake throttling amount of the reburning control device for a particulate filter, which is an embodiment of the present invention.

FIG. 18 is an explanatory diagram showing an inference example when performing a fuzzy inference on the increment of the intake throttle amount of the reburning control device for the particulate filter according to the embodiment of the present invention.

FIG. 19 is a flowchart showing a fuel injection amount control routine executed by the CPU of the particulate filter reburning control apparatus according to an embodiment of the present invention.

FIG. 20 is an explanatory diagram showing a characteristic of a basic fuel injection amount of a reburning control device for a particulate filter that is an embodiment of the present invention.

FIG. 21 is an explanatory diagram showing a characteristic of an intake throttle correction coefficient of a reburning control device for a particulate filter according to an embodiment of the present invention.

[Explanation of symbols]

 M1 Internal combustion engine M2 Particulate filter M3 Collection amount determination means M4 Exhaust gas temperature raising means M5 Filter temperature detection means M6 Target temperature setting storage means M7 Target temperature setting means M8 Exhaust temperature control means M9 Passing air amount detection means M10 Cross pressure difference Detection means 1 Diesel engine 8 Particulate filter 10 Stepper 11 Intake throttle valve 17 Exhaust temperature sensor 19 CPU 20 ROM

Claims (3)

[Claims] 1. A collection amount determination means for determining a collection amount of a particulate filter provided in an exhaust passage of an internal combustion engine, and a collection amount determined by the collection amount determination means is a predetermined value or more. Sometimes, an exhaust temperature raising means for raising the exhaust temperature of the internal combustion engine to re-burn the trapped particulates, a filter temperature detecting means for detecting the temperature of the particulate filter during the re-burning, and the re-burning In order not to overheat or extinguish the particulate filter in the inside, a plurality of rules for setting the target temperature based on the trapped amount and the temporal variation of the trapped amount, and the trapped amount in the plurality of rules and Target temperature setting storage means for storing a function of setting the degree of belonging to each set by dividing the temporal variation of the collected amount into a set within a predetermined range, and the respective points in the plurality of rules. Degree is calculated,
Target temperature setting means for setting the target temperature of the particulate filter from the degree of belonging, and the actual temperature of the particulate filter detected by the filter temperature detecting means is the target temperature set by the target temperature setting means. The exhaust gas temperature control means for controlling the exhaust gas temperature increasing means is provided so that the particulate matter filter re-combustion control device. 2. A passing air amount detecting means for detecting a passing air amount of a particulate filter provided in an exhaust passage of an internal combustion engine; a front-back differential pressure detecting means for detecting a front-back differential pressure of the particulate filter; When the trapped amount of the particulate filter determined from the passing air amount detected by the passing air amount detecting means and the front-rear differential pressure detected by the front-rear differential pressure detecting means is equal to or more than a predetermined value, the internal combustion engine Exhaust temperature raising means for raising the exhaust temperature to reburn the collected particulates, filter temperature detecting means for detecting the temperature of the particulate filter during the reburning, and of the particulate filter during the reburning In order to prevent overheating and extinguishing, based on the passing air amount and the temporal fluctuation of the passing air amount A plurality of rules for setting the reference temperature, the amount of passing air in the plurality of rules, the temporal variation of the passing air amount, the differential pressure before and after and the temporal variation of the differential pressure before and after are divided into a set of predetermined ranges. A target temperature setting storage unit that stores a function that sets the degree of membership of each set, and calculates the degree of membership of each of the plurality of rules,
Target temperature setting means for setting the target temperature of the particulate filter from the degree of belonging, and the actual temperature of the particulate filter detected by the filter temperature detecting means is the target temperature set by the target temperature setting means. The exhaust gas temperature control means for controlling the exhaust gas temperature increasing means is provided so that the particulate matter filter re-combustion control device. 3. The actual temperature of the exhaust gas temperature control means is set so that the actual temperature of the particulate filter detected by the filter temperature detection means becomes the target temperature set by the target temperature setting means. Difference between the target temperature and the target temperature, and a plurality of rules for setting the control amount of the exhaust gas temperature raising means based on the time variation of the temperature difference, the temperature difference in the plurality of rules and the time variation of the temperature difference. A control amount setting storage unit that stores a function for setting the degree of belonging of each set by dividing the set into a set of a predetermined range, and calculating the degree of belonging of each of the plurality of rules,
The reburning control device for a particulate filter according to claim 1 or 2, further comprising: a control amount setting unit that sets a control amount of the exhaust gas temperature raising unit based on a degree of belonging.