JPH07269328A - Exhaust particulate treatment device for internal combustion engine - Google Patents

Abstract

PURPOSE:To obtain efficient regeneration of a filter throughout the period of regeneration and in a range free from melting loss or the like by varying the guantity of heat supply by means of a filter temperature raising means to the filter in accordance with the degree of progress of the regenerative processing during the time of regeneration of the filter of an exhaust particulate treatment device, thereby varying filter temperature raising characteristics. CONSTITUTION:Particulate discharge from an engine 100 is detected by a discharge detecting means 113, while whether the time of regeneration or the completion of the regeneration is judged by an accumulation detecting means 114. When a filter 105 enters the period of regeneration, a first flow passage switching valve 106 is closed and a second flow passage switching valve 108 is opened, so that only the exhaust leaking from the first flow passage switching valve 106 enters the filter 105. Then, an electric heater 110 is electrified/heated via a heater driving circuit 111. Based on a signal from an operating condition detecting means 112, regenerative electric power is made relatively small in order to avoid a melting loss for high oxygen concentration, while the power is made relatively large in order to improve the combustion for low oxygen concentration. Thus, regeneration can be carried out efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust particle processing apparatus for collecting fine particles contained in exhaust gas of an internal combustion engine and treating the collected fine particles.

[0002]

2. Description of the Related Art Conventionally, from the viewpoint of environmental protection, fine particles (particulate "PM;
In order to prevent (rticulate Mattar ") from being discharged into the atmosphere, an exhaust particulate treatment device has been proposed in which the particulates are collected by a filter provided in the exhaust system. But,
When the collected exhaust particulates are deposited on the filter and the filter is clogged, the filter becomes a large passage resistance and the exhaust pressure increases, which results in deterioration of engine performance and deterioration of fuel consumption. Therefore, it is necessary to remove the trapped exhaust particulates from the filter to regenerate the filter.As a method for regenerating the filter, the trapped exhaust particulates are ignited through an electric heater or the like to propagate combustion. It is considered to be burned down by.

A conventional exhaust particulate treatment apparatus using such a regeneration method detects, for example, the operating state of the engine, estimates the amount of exhaust particulate discharged from the engine based on the detected operating state of the engine, and defines it in the filter. If the exhaust particulates of the above are accumulated, the valve provided in the exhaust passage is closed to suppress the removal of heat quantity by the exhaust gas passing through the filter, and the exhaust (regeneration exhaust) flow rate that can supply the amount of oxygen required for regeneration. There is a device that tries to regenerate the filter efficiently by adjusting it (Japanese Patent Application No. 5-5403).
No. 2).

[0004]

In such a conventional apparatus, as shown in FIG. 9, when the regeneration of the filter is started, the particulates deposited on the filter are heated by the electric heater, and first, the active ""Combustion by propagation" proceeds (the period [0 to t1] in FIG. 9 corresponds to the combustion period by propagation). This "combustion by propagation" is completed in a relatively short time, and the temperature of the filter rises considerably under high oxygen concentration (see FIG. 9 or the solid line [0 to t11] in FIG. 7). Note that under low oxygen concentration, combustion becomes less active than under high oxygen concentration, so the amount of heat generated by combustion itself is small, and the temperature of the filter is lower than under high oxygen concentration (broken line in FIG. 7). [0 to t12]).

By the way, it is difficult to carry out regeneration sufficiently only by "combustion by propagation", and some unburned residue remains. Therefore, it is necessary to continue the heating by the electric heater to burn the unburned particulates even after the “combustion by propagation” is completed. Combustion at the time of heating by the electric heater is defined as "combustion by heating" in order to distinguish it from "combustion by heating" (the period [t1 to t2] in Fig. 9 corresponds to the combustion period by heating).

This "combustion by heating" is inactive as compared with "combustion by propagation", so the amount of heat generated by combustion itself is small, and therefore the filter temperature does not rise so much (see FIG. 9). As described above, the characteristics of the filter regeneration change according to the progress, but in the conventional device, the regeneration power is most burned in order to prevent melting loss, cracks, etc. due to overheating of the filter. At the time of "combustion by propagation" under active high oxygen concentration (solid line [0-t11] in FIG. 9)
Since the filter temperature in Fig. 7) was fixed so as not to exceed the melting limit temperature of the filter, as a result, at the time of "combustion by propagation" under a low oxygen concentration (broken lines [0 to t in Fig. 7
12)), or during "combustion by heating" under low oxygen concentration and under normal oxygen concentration (broken line [t1 to t2] in FIG. 9).
(See, etc.), it was not possible to sufficiently heat and raise the temperature of the filter, and it was the actual situation that the particulates were not sufficiently burned to regenerate the good filter.

The present invention has been made in view of the above-mentioned conventional circumstances. While the filter is being regenerated, when the combustion is activated, melting loss and cracks due to overheating of the filter are prevented, while
An object of the present invention is to provide an exhaust particulate treatment device for an internal combustion engine, which controls the amount of heat supplied by a filter temperature raising means so as to heat the filter when combustion is inactive, thereby favorably regenerating the filter. And Further, depending on the operating state, the oxygen concentration in the exhaust changes and the degree of combustion activity also changes.To cope with this, the heat supply amount of the filter temperature raising means should be controlled according to the oxygen concentration in the exhaust. , Aim to be able to regenerate the filter more efficiently.

[0008]

Therefore, as shown in FIG. 1, an exhaust particulate treatment system for an internal combustion engine according to a first aspect of the present invention is installed in an exhaust passage of the internal combustion engine, and the exhaust particulate matter A filter A for collecting fine particles, a regeneration timing detecting means B for detecting the regeneration timing of the filter A, a filter temperature raising means C for supplying a heat quantity to raise the temperature of the filter A, and a filter A for flowing into the filter A. An exhaust gas inflow amount control means D for reducing the exhaust gas flow rate, and when the regeneration timing is detected by the regeneration timing detection means B, the exhaust gas inflow amount control means D reduces the exhaust gas flow rate into the filter. In addition, in the exhaust gas treatment apparatus for the internal combustion engine in which the temperature of the filter is raised by the filter temperature raising means C to regenerate the filter, the regeneration process progresses when the filter A is regenerated. It was constructed with a first filter temperature increasing characteristic change means E for changing the Atsushi Nobori characteristics of the filter by changing the amount of heat supplied to the filter of the filter Atsushi Nobori means C in accordance with the fit.

According to the second aspect of the invention, the first filter temperature rising characteristic changing means E is compared with the heat quantity supplied to the filter of the filter temperature rising means within a predetermined time from the start of regeneration, and after the predetermined time has elapsed. The amount of heat supplied to the filter by the filter temperature raising means is increased during the period from the end of regeneration to the end of regeneration. The invention according to claim 3 is configured to include a secondary air supply means F for supplying secondary air to the filter A when the filter A is regenerated.

According to the fourth aspect of the present invention, as shown in FIG. 2, the filter A is provided in the exhaust passage of the internal combustion engine to collect the particles in the inflowing exhaust gas, and the regeneration timing of the filter A. A regeneration timing detecting means B for detecting the temperature, a filter temperature raising means C for supplying a heat quantity to raise the temperature of the filter A,
An exhaust gas inflow amount control means D for reducing the amount of exhaust gas flowing into the filter A, and the regeneration timing detection means B.
When the regeneration timing is detected by, the exhaust gas inflow control means D controls the exhaust flow rate flowing into the filter A, and the filter temperature raising means C heats the filter A to regenerate the filter A. In the exhaust gas treatment apparatus for an internal combustion engine configured to perform the above, when the filter A is regenerated, the amount of heat supplied to the filter of the filter temperature raising means C is changed according to the oxygen concentration in the exhaust gas to improve the temperature raising characteristic of the filter. Second filter temperature rising characteristic changing means G for changing
It is equipped with.

According to the fifth aspect of the present invention, the second filter temperature raising characteristic changing means G is provided with the filter A of the filter temperature raising means C within a predetermined time from the start of regeneration when the oxygen concentration in the exhaust gas is high. The amount of heat supplied to the filter of the filter temperature raising means C is increased from the start of regeneration when the predetermined time elapses to the end of regeneration compared to the amount of heat supplied to the filter. The heat supply amount to the filter A of the filter temperature raising means C within a predetermined time is set to be larger than that when the oxygen concentration in the exhaust gas is high, and the heat supply amount and between the end of the predetermined time and the regeneration end. The amount of heat supplied to the filter A by the filter temperature raising means C is made to substantially match.

According to the sixth aspect of the present invention, the predetermined time is set to a time when combustion by propagation is almost completed.

[0013]

According to the exhaust gas treating apparatus for the internal combustion engine having the above-mentioned structure, when the regeneration timing is detected by the regeneration timing detecting means, the exhaust gas inflow amount controlling means causes the exhaust gas to flow into the filter. By controlling the exhaust gas flow rate to be reduced, the amount of oxygen suitable for regeneration is supplied and the amount of heat taken away during regeneration is suppressed, while the filter temperature raising means is operated to regenerate the filter. In the initial stage of the treatment, since many particles are collected, regeneration (combustion) is active and the filter temperature becomes high. On the other hand, as the regeneration process progresses, the amount of particulate accumulated on the filter decreases and The activity decreases and the filter temperature decreases. Therefore, as in the conventional case, when the heat supply amount to the filter of the filter temperature raising means is set to be constant during regeneration, combustion is activated near the melting limit temperature of the filter in the initial stage of regeneration, and combustion is not activated. Although it can be achieved, in the latter stage of regeneration, the filter temperature is lowered and the combustion of fine particles cannot be performed sufficiently. In view of this, in the present invention, the first filter temperature rising characteristic changing means changes the heat supply amount of the filter temperature rising means in accordance with the degree of progress of the regeneration process so that the filter is eroded during the regeneration period of the filter. The regeneration (combustion) is activated in the range where the above phenomenon does not occur, and thus the filter is regenerated with high efficiency.

According to the second aspect of the present invention, the first filter temperature raising characteristic changing means is compared with the heat quantity supplied to the filter of the filter temperature raising means within a predetermined time from the start of regeneration, and after the predetermined time has elapsed, The amount of heat supplied to the filter of the filter heating means until the end of regeneration is set to be large, and with such a simple configuration, during the period when combustion in the initial stage of regeneration is active (combustion period due to propagation), While the filter temperature is regenerated within the melting temperature limit range, in the latter period of regeneration where combustion is not active (combustion period due to heating), the filter temperature is increased by increasing the amount of heat supplied to activate combustion of fine particles. Plan.

According to the third aspect of the present invention, when the filter is regenerated, a secondary air supply means for supplying the secondary air to the filter is included, so that the amount of oxygen flowing into the filter during regeneration can be adjusted with high accuracy. By controlling and changing the engine operating state and changing the amount of oxygen in the exhaust flowing into the filter,
It prevents the filter playback state from changing and facilitates playback optimization.

According to the fourth aspect of the invention, when the regeneration timing is detected by the regeneration timing detecting means, the exhaust gas inflow control means controls the exhaust gas flow rate into the filter so that it is suitable for regeneration. The amount of oxygen is supplied and the amount of heat is removed during regeneration, while the filter temperature raising means is operated to regenerate the filter. This regeneration process is performed by the influence of the oxygen concentration in the exhaust gas (combustion). ) Is affected and regenerates (burns) under high oxygen concentration
Is activated and the temperature of the filter becomes high, while under low oxygen concentration, the activity of regeneration (combustion) is lowered and the filter temperature is lowered. Therefore, as in the conventional case, when the heat supply amount to the filter of the filter temperature raising means is set to be constant irrespective of the oxygen concentration in the exhaust gas, under the high oxygen concentration, near the melting limit temperature of the filter. Although the combustion can be activated by burning it, it cannot be said that the combustion temperature was sufficiently activated under the low oxygen concentration because the filter temperature was too low. Therefore, in the present invention, the second filter temperature raising characteristic changing means changes the heat supply amount of the filter temperature raising means in accordance with the oxygen concentration in the exhaust gas during regeneration (oxygen concentration flowing into the filter). In this way, the regeneration (combustion) of the filter is activated regardless of the oxygen concentration in the exhaust gas, so that the regeneration of the filter can be performed with high efficiency.

In a fifth aspect of the present invention, the second filter temperature raising characteristic changing means is configured to control the heat of the second filter temperature raising means to the filter within a predetermined time from the start of regeneration when the oxygen concentration in the exhaust gas is high. Compared with the supply amount, the heat supply amount to the filter of the filter temperature raising means is increased from the lapse of the predetermined time to the end of regeneration, and when the oxygen concentration in the exhaust gas is low, within a predetermined time from the start of regeneration. The heat supply amount to the filter of the filter temperature raising means is set to be larger than that when the oxygen concentration in the exhaust gas is high, and the heat supply amount of the filter temperature raising means during the period from the elapse of the predetermined time to the end of the regeneration. The amount of heat supplied to the filter is made to approximately match so that the filter melts during the period when combustion in the initial stage of regeneration is active (combustion period due to propagation), regardless of the oxygen concentration in the exhaust gas. Achieving activation of combustion of the particulate while suppressing the like, in the period combustion is not active in the later-stage regeneration (combustion period by heating) was to raise the filter temperature so as to revitalize the combustion of the particulate.

According to the sixth aspect of the present invention, the predetermined time is set to be a time at which the combustion by propagation is almost completed. By making it almost the end of "combustion", "combustion due to propagation" while preventing filter meltdown, etc.
And the subsequent "combustion by heating" optimization,
Therefore, the filter can be regenerated with high efficiency.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 3 shows the configuration of the exhaust particulate treatment system according to the first embodiment of the present invention. Exhaust passage 101 connected to exhaust manifold of internal combustion engine 100
In the middle of the first branch passage 102 and the second branch passage
It is configured such that it is once branched into the branch passage 103 and then merges again.

In the first branch passage 102, a filter 105, which is installed in a filter case 104 and collects particulate matter in exhaust gas, is interposed. A first flow path switching valve 106 that controls the amount of exhaust gas flowing into the filter 105 is provided downstream of the filter case 104 in the first branch passage 102 on the exhaust gas downstream side. The second
The branch passage 103 has the filter 105 in the middle thereof.
A second flow path switching valve 108 that controls the amount of exhaust gas flowing into the valve is interposed.

The second branch passage 103 has a filter 10
5 is a passage for bypassing the filter 105 and exhausting it during the regeneration of No. 5. The first flow path switching valve 106
A first valve drive device 107 that opens and closes and a second valve drive device 109 that opens and closes the second flow path switching valve 108 are provided. These first valve drive device 107 and second valve drive device 1
09 is controlled based on the drive signal from the control unit 115.

Here, the first flow path switching valve 10
6, the second flow path switching valve 109, the control unit 115 and the like constitute the exhaust gas inflow amount control means according to the present invention. An electric heater 110 for heating and burning the particulates collected by the filter 105 is provided on the exhaust gas upstream side of the filter 105. A heater drive circuit 111 for driving the electric heater 110 is provided. Such a heater drive circuit 11
1 is controlled based on a drive signal from the control unit 115.

Here, the electric heater 110 is
The filter temperature raising means according to the present invention is configured. Further, the load of the engine (basic injection amount Tp, accelerator opening C / L,
Engine operating state detecting means 11 for detecting the operating state of the engine such as throttle opening TVO), engine speed, cooling water temperature, etc.
Two are provided. The operating state detecting means 112 can use an accelerator sensor, a throttle sensor, a crank angle sensor, a water temperature sensor, etc. which are usually used for engine control.

Then, an emission amount detecting means 113 for detecting / estimating the amount of particulates discharged from the engine 100, and an amount of particulates deposited on the filter are estimated, and a deposition amount is detected to judge the regeneration time and the regeneration end time. Means 114
Is provided. The discharge amount detecting means 113 and the accumulation amount detecting means 114 are provided in the CPU, ROM, R, as will be described later.
The control unit 115 including a microcomputer including an AM, A / D converter, an input / output interface and the like is provided as software.

The operation of the filter regeneration of this embodiment having the above construction will be described below. When collecting the particulates with the filter 105, the first flow path switching valve 106 is opened via the first valve driving device 107, and the second flow path switching valve 108 is routed via the second valve driving device 109. And close the valve, filter 1
05 allows almost all the exhaust gas to pass through.

When the filter 105 reaches the regeneration time, first, the first flow path switching valve 106 on the downstream side of the filter 105 is closed via the first valve drive device 107 and the second flow path switching is performed. The valve 108 is opened via the second valve drive device 109. As a result, the ventilation resistance of the second branch passage 103 is reduced, while the passage resistance on the side of the first branch passage 102 is increased. Therefore, the filter 105 is provided with the amount of leakage of the exhaust gas from the first passage switching valve 106. Only the exhaust gas adjusted to a predetermined amount by the setting will flow in, that is, the exhaust gas (oxygen which is optimally regenerated within the range where the filter 105 does not melt and melt) suitable for "combustion by propagation" (oxygen). ) Will flow into the filter 105. Therefore, "combustion by propagation" can be optimized. It should be noted that since the exhaust pressure is suppressed from increasing during regeneration by switching the exhaust passage (switching from the first branch passage 102 to the second branch passage 103), deterioration of drivability during filter regeneration is prevented. Become.

In this state, the electric heater 110 is electrically heated via the heater drive circuit 111 to start regeneration of the filter. Under high oxygen concentration (for example, when the regeneration is performed in the operating region I shown in FIG. 6), the electric heater 1
After energization of 10, while "combustion by propagation" is progressing (that is, from the start of regeneration 0 to time t1 from the end of combustion propagation as shown in FIG. 9) Note that this t1 is
As shown in FIG. 7, in the case of the operating region I, it becomes t11. ), To supply the regenerative power required for "combustion by propagation". In this case, as described above, the combustion is activated because the combustion is performed under a high oxygen concentration.
Is not overheated and melted, that is, the filter 10
The regeneration power is controlled to a relatively small value (W2 in FIG. 10) so that the temperature of 5 becomes equal to or lower than the melting limit temperature of FIG.

On the other hand, under low oxygen concentration (for example, when regeneration is performed in the operating region II shown in FIG. 6), "combustion by propagation" (that is, from regeneration start 0 to combustion propagation end in FIG. 9). Until time t1, which is t12 in the operating region II, as shown by the broken line in Fig. 7, when the oxygen concentration is high (operating region I). Compared to the case where "combustion by propagation" is performed,
Since the degree of active combustion is low, the temperature of the filter 105 also becomes low (see the broken line in FIG. 7). Therefore, the regeneration power (W1 in FIG. 11) higher than the regeneration power (W2 in FIG. 10) supplied at the time of “combustion by propagation” under the high oxygen concentration is supplied, whereby the regeneration power in the low oxygen concentration is increased. It is designed to improve "combustion by propagation".

After the "combustion by propagation" is completed,
"Combustion by heating" until the regeneration is completed (that is, from t1 shown in FIG. 9 to time t2 when the regeneration is completed)
Since the relatively small amount of particulates left unburned by "combustion by propagation" burns during
Therefore, the temperature of the filter 105 also becomes lower than that during "combustion by propagation" (see the broken line in FIG. 9). Therefore, in the case of a high oxygen concentration, the regeneration power (W1 in FIG. 10) higher than the regeneration power (W2 in FIG. 10) at the time of “combustion by propagation” is supplied, and thus “heating” is performed. It is designed to improve "combustion".

The detection of the reproduction time and the reproduction end time is
It is performed as follows. First, based on the detection signal of the operating state detecting means 112 for detecting the accelerator opening degree, the engine speed, etc., the discharge amount detecting means 113 refers to the search map of the operating area & particulate discharge amount shown in FIG. Detect particulate emissions from institutions.

Then, based on the detection results of the operating state detecting means 112 and the discharge amount detecting means 113, the accumulation amount detecting means 114 detects the accumulation amount of particulates on the filter 105. After that, when the deposition amount becomes equal to or larger than a predetermined amount, the deposition amount detection means 114 determines that the filter 105 is to be regenerated, and determines the regeneration end time based on the deposition amount and the operating state. The control unit 115 is configured to perform the reproduction based on the judgment result of the reproduction time and the reproduction end time. Therefore, the accumulation amount detecting means 116 constitutes the regeneration timing detecting means according to the present invention.

Next, the filter regeneration control performed by the control unit 115 according to this embodiment will be specifically described with reference to the flow charts shown in FIGS. In step (denoted by S in the figure, the same applies hereinafter) 1, signals such as the engine speed and the engine load are read. The step 1 constitutes the operating state detecting means 112.

In step 2, the total amount of particulate emissions from the engine 100 per unit time is referred to by referring to the search map of the operating area & particulate emissions shown in FIG.
Find by searching. The step 2 constitutes the discharge amount detecting means 113. In step 3, it is determined whether the filter 105 is being regenerated. If it is being reproduced, the process proceeds to step 16, and if it is not being reproduced, the process proceeds to step 4.

In step 4, the particulate accumulation amount β on the filter 105 is obtained from the total particulate emission amount (integrated amount) obtained in step 2. In step 5, the amount of particulate accumulation β on the filter 105 is
It is determined whether or not the recyclable accumulation amount βRe, which is the regeneration time, has been exceeded. If the particulate accumulation amount β exceeds the recyclable accumulation amount βRe and it is determined that the regeneration time has come, the process proceeds to step 6, and if it is determined that it is not the regeneration time, step 1
Go to.

In step 6, a reproduction flag is added to indicate that the filter 105 is reproducing. In step 7, the first flow path switching valve 106 on the filter 105 side is set to the first
The valve is closed via the valve drive device 107. In step 8,
The second flow path switching valve 108 on the second exhaust passage 103 side is
The valve is opened via the valve drive device 109.

Then, the process proceeds to the flow chart A shown in FIG. In Flowchart A, step 1 described below
3 to step 17 are executed. In step 13, it is determined whether the exhaust gas in the operating state during regeneration has a high oxygen concentration or a low oxygen concentration based on the map showing the relationship between the operating state shown in FIG. 6 and the oxygen concentration in the exhaust gas.

In step 14, since it was judged in step 13 that the regeneration was carried out under high oxygen concentration, the energization pattern 1 at high oxygen concentration shown in FIG.
It corresponds to the first filter temperature rising characteristic changing means according to the present invention. ), The supply of the regenerative electric power to the regenerative electric heater 110 is started. That is, at the time of “combustion by propagation” (between 0 and t1 in FIG. 10) under high oxygen concentration, the electric power W2 for regeneration is controlled to “combustion by heating” (t in FIG. 10).
1 to t2), the reproduction power W1 (>
W2).

In step 15, since it was determined in step 13 that the regeneration was performed under a low oxygen concentration, the energization pattern 2 at the low oxygen concentration shown in FIG.
It corresponds to the second filter temperature rising characteristic changing means according to the present invention. ), The supply of the regenerative electric power to the regenerative electric heater 110 is started. That is, at the time of “combustion by propagation” (between 0 and t1 in FIG. 11) under low oxygen concentration, the regeneration electric power W1 is controlled, and “combustion by heating” (t in FIG. 11).
Even after the transition to (between 1 and t2), the electric power for reproduction W1 is controlled.

In step 16, it is determined whether the energization time t of the electric heater 110 has exceeded a predetermined time t2. That is, it is determined whether the reproduction is completed. In step 17, since the predetermined time t2 has elapsed (regeneration ends), the power supply to the electric heater 110 is ended. When steps 13 to 17 (flow chart A) are completed as described above, the process then returns to step 9 of the flow chart shown in FIG.

In step 9, the first filter on the filter 105 side is
The flow path switching valve 106 is opened via the first valve drive device 107. In step 10, the second flow path switching valve 108 on the second exhaust passage 103 side is closed via the second valve drive device 109. In step 11, since the regeneration of the filter 105 is completed, the particulate matter accumulation amount β on the filter 105 is
Is reset to 0.

At step 12, since the reproduction of the filter 105 is completed, the reproduction flag 1 is removed and the present flow ends. As described above, according to this embodiment, during the “combustion by propagation” under a high oxygen concentration, the regeneration exhaust flow rate commensurate with the combustion and the regeneration power W2 to the electric heater 110 are supplied. While it is possible to optimize “combustion by propagation” while preventing melting loss of the filter 105, etc., when burning the particulates left unburned by “combustion by propagation” by “combustion by heating”, electric heating is performed. The regeneration power to the heater 110 is controlled to W1 (> W2) to raise the temperature of the filter 105 to improve "combustion by heating" (see the solid line and the broken line in the period [t1 to t2] in FIG. 9). (See reference), so that the particulates can be completely burned out. That is, the filter 105 can be favorably regenerated without causing the filter 105 to melt or the like.

Further, in "combustion by propagation" under a low oxygen concentration, "combustion by propagation" under a high oxygen concentration
Since the regeneration power W1 (corresponding to the maximum capacity of the electrothermal heater 110) higher than the regeneration power W2 to the electrothermal heater 110 is supplied, the "combustion by propagation" under a low oxygen concentration can be improved. it can. In the present embodiment, the first flow path switching valve 106 is provided on the downstream side of the filter 105, but of course, it may be provided on the first branch passage 102 on the upstream side of the filter 105.
Further, in the present embodiment, the first flow path switching valve 106 and the second flow path switching valve 108 have been described by using the on-off valve, but instead of this, an orifice is adopted and the orifice diameter is variably controlled. However, the same effect as this embodiment can be obtained.

Further, the first flow passage switching valve 106 and the second exhaust flow passage switching valve 108 are constituted by valves whose opening can be adjusted so that the flow rate of exhaust gas flowing into the filter 105 at the time of regeneration is controlled to be high oxygen concentration or low. The flow rate is controlled to be suitable for "combustion by propagation" under oxygen concentration, and at the time of "combustion by heating", the flow rate is controlled to be suitable for the combustion mode, and the regeneration is appropriately performed according to the controlled exhaust flow rate. By controlling the power, it is possible to further optimize the regeneration of the filter 105 and reduce the power consumption.

In the present embodiment, for regeneration under a high oxygen concentration, the power supply is changed to W2 within a predetermined time from the start of regeneration, and the power supply is changed to W1 after the predetermined time elapses until the regeneration is completed. As described above, if it is desired to give priority to the suppression of battery consumption due to rapid charge / discharge even at the expense of shortening the reproduction time, a small amount of power for reproduction is required between the end of the predetermined time and the end of reproduction. The reproduction may be performed at W2. That is, by changing the supply amount of the regeneration electric power according to the oxygen concentration in the exhaust gas (that is, the electric power supplied under the high oxygen concentration is set to W2, while the electric power supplied under the low oxygen concentration is changed to W1). Setting) to improve "combustion due to propagation" under low oxygen concentration, the regeneration of the filter is sufficiently improved compared to the conventional one in which the power supply amount W2 is fixed regardless of the oxygen concentration. can do.

In the present embodiment, the oxygen concentration is detected based on the operating condition, but of course an oxygen sensor or the like which can directly detect the oxygen concentration in the exhaust gas may be provided. In this case, there is an advantage that finer reproduction control can be performed. Next, a second embodiment according to the present invention will be described.

FIG. 12 shows the overall structure of an exhaust particulate treatment system according to the second embodiment of the present invention. Internal combustion engine 100
Exhaust passage 10 connected to the exhaust manifold of
1 is configured such that, in the middle thereof, the first branch passage 102 and the second branch passage 103 are once branched and then merged again.

In the first branch passage 102, a filter 105 which is built in a filter case 104 and collects particulate matter in exhaust gas is interposed. And the first
On the exhaust gas upstream side of the filter case 104 in the branch passage 102, a first flow path switching valve 106A that controls the amount of exhaust gas flowing into the filter 105 is interposed. Then, when the filter 105 is regenerated, the filter 2 for regeneration
An air pump 116 for supplying secondary air is provided, and the secondary air for regeneration from the air pump 116 is a secondary air supply passage 117 opened between the first flow path switching valve 106A and the filter 105. It is designed to be supplied via. The air pump 116 is driven via a pump drive device 118 which is controlled by a signal from the control unit 115.

A second flow passage switching valve 108 for controlling the amount of exhaust gas flowing into the filter 105 is provided in the middle of the second branch passage 103. Such a second
The branch passage 103 is a passage for bypassing and exhausting the filter 105 during regeneration of the filter 105.
In addition, the first flow path switching valve 106A for opening and closing the first
A valve drive device 107A and a second valve drive device 109 that drives the second flow path switching valve 108 to open and close are provided. These first
The valve drive device 107A and the second valve drive device 109 are controlled based on a drive signal from the control unit 115.

Here, the first flow path switching valve 106
A, the second flow path switching valve 108, the control unit 115 and the like constitute the exhaust gas inflow amount control means according to the present invention. Then, the air pump 116, the secondary air supply passage 117, the control unit 115 and the like constitute the secondary air supply means according to the present invention. An electric heater 110 for heating and burning the particulates collected by the filter 105 is provided on the exhaust gas upstream side of the filter 105, and the electric heater 11 is also provided.
A heater drive circuit 113 for driving 0 is provided. The heater drive circuit 113 is controlled based on a drive signal from the control unit 115.

Here, the electric heater 110 is
The filter temperature raising means according to the present invention is configured. Further, an operating state detecting means 112 for detecting the operating state of the engine such as the load of the engine, the rotation speed, the cooling water temperature, etc. is provided.
Further, an emission amount detection means 113 for detecting / estimating the amount of particulate emissions from the engine and an amount of particulate deposits on the filter 105 are estimated / detected, and the regeneration timing of the filter 105 is based on the amount of particulate deposits. , Accumulation amount detecting means 114 for setting the regeneration end time
Is provided. The discharge amount detecting means 113 and the deposit amount detecting means 114 are provided in software in a microcomputer or the like in the control unit 115.

Now, the operation of the second embodiment will be described. When collecting the particulates in the filter 105, the first flow path switching valve 106A is set to the first valve drive device 107A.
And the second flow path switching valve 108 is closed via the second valve drive device 109.
Allow almost all the exhaust gas to pass through.

When particulates are deposited on the filter 105 and it is time to regenerate the filter 105, first, the first flow path switching valve 106A on the upstream side of the filter 105.
Is closed via the first valve drive device 107A, and the second flow path switching valve 108 is opened via the second valve drive device 109. As a result, the ventilation resistance on the side of the second branch passage 103 is greatly reduced and the passage resistance on the side of the first branch passage 102 is increased, so that almost all the exhaust gas flows through the side of the second branch passage 103.

In this state, the electric heater 110 is electrically heated via the heater driving circuit 111 to regenerate the filter. After energization of the electric heater 111, while "combustion by propagation" is in progress (that is, as shown in FIG. 9, from time 0 of regeneration to time t1 of completion of combustion propagation), as shown in FIG. As shown, the regeneration power W2 required for "combustion by propagation" is supplied. As a result, the regeneration of the filter 105 by "combustion due to propagation" can be favorably performed without causing melting loss or the like.

In the present embodiment, the filter 105
Since the secondary air having a stable oxygen concentration is supplied by the air pump 116 at the time of regeneration, the oxygen concentration at the time of regeneration does not depend on the operating state of the engine 100, so that it is stable and high. Regeneration efficiency can be obtained. From the end of the "combustion by propagation" to the end of the regeneration (that is, between t1 and t2), the regeneration power W1 higher than the regeneration power W2 at the "combustion by propagation" is supplied. . In other words, while the "combustion by heating" is performed, the degree of activeness of combustion is lower than that in the case where "combustion by propagation" is performed, so the temperature of the filter 105 becomes low. Therefore, the regeneration power higher than that at the time of "combustion by propagation" is supplied to raise the temperature of the filter 105, thereby improving "combustion by heating".

The detection of the reproduction time / reproduction end time is the same as in the first embodiment, and the description thereof will be omitted. Next, the filter regeneration control performed by the control unit 115 in the second embodiment will be specifically described with reference to the flowcharts shown in FIGS.

Since steps 1 to 8 shown in FIG. 13 are the same as the flowchart of FIG. 4 explained in the first embodiment, the explanation thereof will be omitted. After step 8, in the second embodiment, the process once proceeds to the flowchart B shown in FIG. That is, in the flowchart B, it is determined in step 6 that it is time to regenerate the filter 105, the first flow path switching valve 106A is closed in step 7, and the second flow path switching valve 108 is opened in step 8. After that, step 18 to step 22 are executed as follows. In step 18, the secondary air amount for regeneration is set to the air pump 116.
Supplied from The air pump 116 uses the pump drive device 1 based on a signal from the control unit 115.
Driven via 18.

In step 19, in this embodiment,
Regardless of the operating state of the engine 100 by the air pump 116, the secondary air for regeneration, which is accurately controlled to a predetermined amount, is supplied to perform regeneration, so that the energization pattern is changed according to the oxygen concentration as in the first embodiment. The predetermined regeneration power is supplied to the electric heater 110 according to the energization pattern 1 under the high oxygen concentration shown in FIG. 10 without switching. That is, at the time of "combustion by propagation" in the initial stage of regeneration (between 0 and t1 in Fig. 10), the electric power W2 for regeneration is controlled to perform "combustion by heating" (Fig. 10).
(Between t1 and t2), the reproduction power W1
(> W2).

In step 20, it is determined whether the energization time t of the electric heater 110 has exceeded a predetermined time t2. In step 21, the supply of the secondary air for regeneration is stopped, assuming that the regeneration has ended after the elapse of the predetermined time t2. In step 22, the electric heating of the electric heater 110 is finished.

Upon completion of steps 18 to 22 (flow chart B), the process again proceeds to step 9 of the flow chart shown in FIG. In step 9, the first flow path switching valve 106A on the filter 105 side is opened via the first valve drive device 107A. As a result, the exhaust gas passes through the filter 105, and the collection of particulates on the filter 105 is restarted.

In step 10, the second flow path switching valve 108 on the second exhaust passage 103 side is closed via the second valve drive device 109. This is because the inflow of the exhaust gas to the second exhaust passage 103 side is prohibited and the exhaust gas is allowed to flow to the filter 105 side to effectively collect the particulates and prevent the particulates from being discharged to the atmosphere. is there. In step 11, since the reproduction of the filter 105 is completed, the filter 1
The amount of particulate accumulation on 05 is reset to 0.

At step 12, since the reproduction of the filter 105 is completed, the reproduction flag 1 is removed. As described above, according to the present embodiment, during the “combustion by propagation”, the regeneration exhaust flow rate commensurate with the combustion and the regeneration power W2 to the electric heater 110 are supplied to melt the filter 105. While it is possible to optimize "combustion by propagation" while preventing the above, when burning the particulates left unburned by "combustion by propagation" by "combustion by heating",
The regeneration electric power to the electric heater 110 is controlled to W1 (> W2) to improve the "combustion by heating", so that the particulates can be completely burned out. That is, the regeneration efficiency of the filter 105 can be improved without causing the filter 105 to melt or the like.

Further, in this embodiment, since the secondary air for regeneration is supplied by the air pump 116, the oxygen concentration control accuracy is higher than in the first embodiment, and it depends on the operating state of the engine 100. Therefore, it is possible to stably obtain high regeneration efficiency. In addition, in the second embodiment, the one in which the secondary air for regeneration is supplied by the air pump 116 is explained, but in the internal combustion engine including the supercharger, a part of the compressed air of the supercharger is guided. For playback 2
It may be configured to be used as the next air.

Next, the third embodiment will be described. In the first embodiment, in order to simplify the configuration and control, regeneration control is performed with two types of regeneration power W1 and W2 (<W1). As a result, “combustion by propagation” under low oxygen concentration is performed. In the regeneration of "combustion by heating" and "combustion by heating", the same regeneration power W1 as in "combustion by heating" under high oxygen concentration was used for the regeneration. The optimum regeneration electric power exists within a range that does not cause melting loss and the like.

Therefore, in the third embodiment, in order to optimize "combustion by propagation" and "combustion by heating" under high oxygen concentration and low oxygen concentration, respectively, each combustion state is optimized. The reproduction power is variably controlled. Therefore, in the third embodiment, the electric heater 1
The basic configuration is the same as that of the first embodiment except that it is possible to supply the regeneration power of 10 to several stages, and thus detailed description of the configuration is omitted.

The filter regeneration control performed by the control unit 115 in the third embodiment will be described below with reference to the flow chart C shown in FIGS. Note that the flowchart C shown in FIG. 16 replaces the flowchart A of FIG. 5 in the first embodiment, and the flowchart shown in FIG. 15 differs from the flowchart of FIG. 4 in the first embodiment. It is the same.

That is, in step 1, the engine speed,
Read signals such as engine load. In step 2, institution 1
The total particulate emission amount per unit time from 00 is obtained by searching with reference to the operation area & particulate emission amount search map in FIG.

In step 3, it is determined whether the filter 105 is being regenerated. Step 16 if playing
Go to step 4, and if not reproducing, go to step 4. In step 4, the particulate accumulation amount β on the filter 105 is obtained from the total particulate emission amount (integrated amount) obtained in step 2. In step 5, the filter 10
It is determined whether or not the particulate accumulation amount β to 5 exceeds the reproducible accumulation amount βRe which is the regeneration time. If it is determined that the particulate accumulation amount β exceeds the reproducible accumulation amount βRe and the regeneration time has come, the process proceeds to step 6, and if it is determined that it is not the regeneration time, the process proceeds to step 1.

At step 6, a reproduction flag is added to indicate that the filter 105 is being reproduced. In step 7, the first flow path switching valve 106 on the filter 105 side is set to the first
The valve is closed via the valve drive device 107. In step 8,
The second flow path switching valve 108 on the second exhaust passage 103 side is
The valve is opened via the valve drive device 109.

Then, the process proceeds to the flowchart C shown in FIG. In the flowchart C, steps 31 to 39 described below are executed. In step 31,
Based on the map showing the relationship between the operating state and the oxygen concentration in the exhaust gas shown in FIG. 6, the exhaust gas in the operating state during regeneration has a high oxygen concentration (operating region I) or a low oxygen concentration (operating region I).
I) is determined.

At step 32, since it was judged at step 31 that the regeneration was performed under a high oxygen concentration, the energization pattern 3 at high oxygen concentration shown in FIG.
It corresponds to the first filter temperature rising characteristic changing means according to the present invention. ), The supply of the regeneration power W21 to the regeneration electric heater 110 is started. At step 33, it is determined whether or not the energization time t has passed the predetermined time t11, that is,
"Combustion by propagation" period under high oxygen concentration (0 in Fig. 17)
To t11) is completed. If YES, the process proceeds to step 34 to continue "combustion by heating". On the other hand, if NO, the regeneration power W21 is continuously supplied.

In step 34, "combustion by heating"
Since the shift is made (between t11 and t2 in FIG. 17), the reproduction power W11 (> W21) is supplied in accordance with the energization pattern 3 in FIG. In step 35, it is determined whether the energization time t of the electric heater 110 has exceeded a predetermined time t2. That is, it is determined whether the reproduction is completed.

At step 36, since the predetermined time t2 has elapsed (regeneration is completed), the power supply to the electric heater 110 is ended. On the other hand, in step 31, under low oxygen concentration (operating region I
If it is determined to be I), the process proceeds to step 37. In step 37, the energization pattern 4 at low oxygen concentration shown in FIG. 18 (the energization pattern 4 is the first filter mute according to the present invention). It corresponds to the characteristic changing means.
The difference in the power supply amount for regeneration between the energization pattern 3 and the energization pattern 4 corresponds to the second filter temperature rising characteristic changing means according to the present invention. ), The electric heater 110 for regeneration is
The supply of regeneration power W22 (> W21) is started.

At step 38, it is determined whether or not the energization time t has passed the predetermined time t12, that is, whether the "combustion by propagation" period (between 0 and t12 in FIG. 18) under a low oxygen concentration has ended. Determine whether or not. If YES, the process proceeds to step 39 to continue "combustion by heating". On the other hand, if NO, the regeneration power W22 is continuously supplied.

In step 39, "combustion by heating"
Since the operation has shifted to (between t12 and t2 in FIG. 18), the reproduction power W12 (> W22 and W12> W11) is supplied in accordance with the energization pattern 4 in FIG. After that, after passing through the above-mentioned step 35, the energization of the electric heater 110 is ended in step 36.

When the above steps 31 to 39 (flow chart C) are completed, the process then returns to step 9 of the flow chart shown in FIG. In step 9, the first flow path switching valve 106 on the filter 105 side is set to the first
Open via valve drive 107. In step 10, the second flow path switching valve 108 on the second exhaust passage 103 side is closed via the second valve drive device 109.

In step 11, since the regeneration of the filter 105 is completed, the particulate matter accumulation amount β on the filter 105 is reset to zero. In step 12, since the reproduction of the filter 105 is completed, the reproduction flag 1 is removed and the present flow ends. As described above, according to the third embodiment, the electric heaters 11 corresponding to “combustion by propagation” and “combustion by heating” under a high oxygen concentration, respectively.
By supplying the regeneration powers W21 and W11 to 0, the regeneration process can be most effectively performed while preventing the filter 105 from being melted and damaged. When the oxygen concentration is low, the regeneration electric power W22 and W11 are supplied to the electric heater 110 depending on the "combustion by propagation" and the "combustion by heating" under the low oxygen concentration. It is possible to most effectively perform the regeneration process while preventing melting damage and the like of 105. Therefore, regardless of the difference in oxygen concentration and combustion mode, it is possible to completely burn off the particulates without causing the filter 105 to melt and the like, and thus the filter 105
Can be best reproduced.

By the way, in each of the above-mentioned embodiments, for easy understanding or for simplification of the constitution, the regeneration process is divided into two, a "combustion period by propagation" and a "combustion period by heating", respectively. However, the present invention is not limited to this, and the power supply amount required for regeneration is gradually changed according to the degree of progress of regeneration (for example, with time, It may be changed steplessly or in a large number of steps) to optimize the regeneration while preventing the filter 105 from being melted or damaged during the regeneration period. In this case, in the first and third embodiments, it is desirable to use a valve whose opening degree can be controlled. In the second embodiment, the air pump 116
Since the oxygen concentration is used, the oxygen concentration can be easily variably controlled, and therefore the combustion can be easily optimized throughout the regeneration period. .

Further, in each of the above-mentioned embodiments, for easy understanding, the regeneration process is clearly described as being divided into the "combustion period by propagation" and the "combustion period by heating". "Combustion period due to propagation" and "Combustion period due to heating" depending on the shape, heat capacity, etc.
In some cases, the combustion period due to propagation (0 to t1) is not set strictly to the combustion period due to propagation, but is appropriately set so that the required regeneration characteristic can be obtained. I don't mind.

Further, without setting the energization pattern in advance, for example, the temperature of the filter 105 or the temperature in the vicinity of the downstream side is detected, and the end t1 of the combustion period due to propagation is detected based on the temperature detection result. The electric power supplied to the electric heater 110 may be changed based on the detection result. In this case, since the power supply control can be performed according to the actual reproduction state, the reproduction can be performed without waste compared to the case where the energization pattern is set in advance. further,
In each of the above examples, the latter stage of regeneration, that is, "combustion by heating"
The filter temperature at this time is set to be considerably lower than the melting temperature limit of the filter (see FIG. 9), but of course, it should be close to the melting temperature limit of the filter as long as melting loss does not occur. The "combustion by heating" may be further activated to further improve the efficiency of regeneration and shorten the regeneration time.

[0080]

As described above, according to the exhaust particulate treatment system for the internal combustion engine of the first aspect, the first
Since the amount of heat supplied to the filter temperature raising means is changed by the filter temperature raising characteristic changing means in accordance with the degree of progress of the regeneration process, the filter is regenerated within the range in which the filter is not melted or the like during the regeneration period of the filter. (Combustion) can be activated, so that the filter can be regenerated with high efficiency.

According to the invention of claim 2, the first
The filter temperature rising characteristic changing means compares the amount of heat supplied to the filter of the filter temperature increasing means within a predetermined time from the start of regeneration to the filter of the filter temperature increasing means after the predetermined time elapses to the end of regeneration. Since the amount of heat supplied was set to be large, during the period when combustion in the initial stage of regeneration was active (combustion period due to propagation) with a simple configuration, the combustion of fine particles was activated while suppressing melting loss of the filter, During the latter period of regeneration where combustion is not active (combustion period due to heating), the filter temperature can be raised to improve the combustion of fine particles.

According to the third aspect of the invention, since the secondary air supply means for supplying the secondary air to the filter at the time of regeneration of the filter is included, the amount of oxygen flowing into the filter during regeneration is increased. It is possible to prevent the regeneration of the filter from changing due to the change in the engine operating condition and the change in the amount of oxygen in the exhaust gas flowing into the filter, while facilitating the optimization of the regeneration. can do.

According to the fourth aspect of the present invention, the second filter temperature raising characteristic changing means changes the filter of the filter temperature raising means to the filter according to the oxygen concentration in the exhaust gas during regeneration (oxygen concentration flowing into the filter). Since the heat supply amount is changed, the regeneration (combustion) can be activated regardless of the oxygen concentration, and thus the filter can be regenerated with high efficiency.

According to the fifth aspect of the present invention, the second filter temperature raising characteristic changing means is arranged so that when the oxygen concentration in the exhaust gas is high, the heat of the filter temperature raising means to the filter within a predetermined time from the start of regeneration. Compared with the supply amount, the heat supply amount to the filter of the filter temperature raising means is increased from the lapse of the predetermined time to the end of regeneration, and when the oxygen concentration in the exhaust gas is low, within a predetermined time from the start of regeneration. The heat supply amount to the filter of the filter temperature raising means is set to be larger than that when the oxygen concentration in the exhaust gas is high, and the heat supply amount of the filter temperature raising means during the period from the elapse of the predetermined time to the end of the regeneration. Even if the oxygen concentration in the exhaust gas changes, the amount of heat supplied to the filter is made to approximately match, and even if the oxygen concentration in the exhaust gas changes, during the period when combustion in the early stage of regeneration is active (combustion period due to propagation), the filter is eroded While suppressing can be achieved activation of combustion of the particulates, in the period combustion is not active in the later-stage regeneration (combustion period by heating) can raise the filter temperature improve the combustion of the particulate.

According to the sixth aspect of the present invention, the predetermined time is set to be a time at which the combustion due to propagation is substantially completed. By making it almost the end of "combustion", "combustion due to propagation" while preventing filter meltdown, etc.
And the subsequent "combustion by heating" optimization,
Therefore, the filter can be regenerated with high efficiency.

[Brief description of drawings]

FIG. 1 is a diagram for responding to a claim of the invention according to claim 1.

FIG. 2 is a diagram for responding to a claim of the invention according to claim 4;

FIG. 3 is an overall configuration diagram of an exhaust particulate treatment device for an internal combustion engine in a first embodiment.

FIG. 4 is a flowchart illustrating reproduction control according to the embodiment.

FIG. 5 is a flowchart A for explaining reproduction control according to the embodiment.

FIG. 6 is a diagram for explaining the relationship between the engine operating state and the oxygen concentration of exhaust gas in the above embodiment.

FIG. 7 is a diagram for explaining the relationship between the energization heating time and the filter temperature in the same embodiment.

FIG. 8 is a diagram showing a search map of an operating area & particulate emission amount in the same example.

FIG. 9 is a diagram for explaining the relationship between the energization heating time and the filter temperature in the above embodiment.

FIG. 10 is a view for explaining the relationship between the energization heating time and the regeneration power in the above embodiment (energization pattern 1; high oxygen concentration condition).

FIG. 11 is a diagram for explaining the relationship between energization heating time and regeneration power in the above embodiment (energization pattern 2; low oxygen concentration condition).

FIG. 12 is an overall configuration diagram of an exhaust particulate treatment device for an internal combustion engine in a second embodiment.

FIG. 13 is a flowchart illustrating reproduction control according to the embodiment.

FIG. 14 is a flowchart B illustrating reproduction control according to the embodiment.

FIG. 15 is a flowchart illustrating reproduction control according to the third embodiment.

FIG. 16 is a flowchart C for explaining reproduction control in the above embodiment.

FIG. 17 is a diagram for explaining the relationship between the energization heating time and the regeneration power in the above embodiment (energization pattern 3; high oxygen concentration condition).

FIG. 18 is a diagram for explaining the relationship between energization heating time and regeneration power in the above embodiment (energization pattern 4; low oxygen concentration condition).

[Explanation of symbols]

 100 Internal Combustion Engine 101 Exhaust Passage 102 First Branch Passage 103 Second Branch Passage 105 Filter 106 First Passage Changeover Valve 108 Second Passage Changeover Valve 110 Electric Heater 115 Control Unit 116 Air Pump

Claims (6)

[Claims] 1. A filter which is installed in an exhaust passage of an internal combustion engine and collects fine particles in inflowing exhaust gas, a regeneration timing detecting means for detecting a regeneration timing of the filter, and a filter for supplying a heat quantity to the filter. The exhaust gas inflow amount when the regeneration timing is detected by the regeneration timing detection means. In the exhaust particulate treatment device of the internal combustion engine, which controls the exhaust flow rate flowing into the filter by the control means and heats the filter by the filter temperature raising means to regenerate the filter, at the time of regenerating the filter, A first filter that changes the temperature rise characteristic of the filter by changing the amount of heat supplied to the filter by the filter temperature raising means in accordance with the degree of progress of the regeneration process. Exhaust particulate processing device for an internal combustion engine, characterized in that it comprises a temperature characteristic changing means. 2. The first filter temperature raising characteristic changing means compares the heat quantity supplied to the filter of the filter temperature raising means within a predetermined time from the start of regeneration with the heat from the predetermined time to the end of regeneration. The exhaust particulate treatment system for an internal combustion engine according to claim 1, wherein the amount of heat supplied to the filter by the filter temperature raising means is large. 3. The internal combustion engine according to claim 1, further comprising a secondary air supply means for supplying secondary air to the filter when the filter is regenerated. Exhaust particulate treatment equipment. 4. A filter which is interposed in an exhaust passage of an internal combustion engine and collects fine particles in inflowing exhaust gas, a regeneration timing detecting means for detecting a regeneration timing of the filter, and a filter for feeding a heat quantity. The exhaust gas flow rate control means for reducing the flow rate of the exhaust gas flowing into the filter, and the exhaust gas flow rate when the regeneration timing is detected by the regeneration timing detection means. In the exhaust particulate treatment system of the internal combustion engine, wherein the control means controls the exhaust flow rate into the filter so as to reduce the temperature, and the filter temperature raising means heats the filter to regenerate the filter. A second filter temperature raising which changes the temperature raising characteristic of the filter by changing the amount of heat supplied to the filter by the filter temperature raising means according to the oxygen concentration in the exhaust gas. Exhaust particulate processing device for an internal combustion engine, characterized in that it comprises a gender changing means. 5. When the oxygen concentration in the exhaust gas is high, the second filter temperature raising characteristic changing means compares the predetermined amount of heat with the filter of the filter temperature raising means within a predetermined time from the start of regeneration. When the amount of heat supplied to the filter of the filter temperature raising means is increased from the lapse of time to the end of regeneration and the oxygen concentration in the exhaust gas is low, the filter of the filter temperature raising means within a predetermined time from the start of regeneration Increase the heat supply to the exhaust when the oxygen concentration in the exhaust is high,
5. The internal combustion engine according to claim 4, wherein the heat supply amount and the heat supply amount to the filter of the filter temperature raising means during the period from the lapse of the predetermined time to the end of the regeneration are substantially matched. Exhaust particulate treatment equipment. 6. The exhaust particulate treatment system for an internal combustion engine according to claim 2 or 5, wherein the predetermined time is a time when combustion by propagation is substantially finished.