JP2002357140A - Exhaust emission control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of simply regenerating DPF without generating sulfuric acid mist and obtaining clean exhaust gas. SOLUTION: In this exhaust emission control device 2, cerium oxide is charged into an air intake passage 21, and particulates stored in the DPF 811 are oxidized by the cerium oxide and are combusted and removed by utilizing a temperature of exhaust gas. Consequently, the particulates can be surely combusted and removed even at a temperature of exhaust gas, and the occurrence of sulfuric acid mist can be suppressed because a conventional platinum oxidation catalyst is not used at this time. Moreover, since the occurrence itself of the particulates can be suppressed by oxidation accelerating action of cerium oxide in a cylinder, exhaust gas can be made further clean owing to double effects of the suppression effect and scavenging effect in the DPF 811.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus for an internal combustion engine, and more particularly, to a particulate filter provided in an exhaust passage of the internal combustion engine for trapping particulates in exhaust gas. The present invention relates to an exhaust gas purification device.

[0002]

2. Description of the Related Art Conventionally, a combustion aid having an oxidation promoting action in a cylinder (combustion chamber) is constantly supplied to an intake passage or fuel of a diesel engine (internal combustion engine) to improve combustion efficiency on a cylinder wall or the like. It is known to reduce the generation of black smoke containing particulates and to clean exhaust gas. However, with such a combustion aid, it is possible to reduce the particulates, but it is difficult to completely suppress the discharge to the outside.

[0003] In recent years, particulates in exhaust gas exhausted from a diesel engine have been filtered by a diesel particulate filter (hereinafter referred to as DPF (Dielectric Filter)).
The development of an exhaust gas purification device that collects by eselParticulate Filter) has been actively developed. In such an exhaust gas purifying apparatus, since the particulates are physically collected, the discharge of the particulates can be almost certainly suppressed.

[0004]

In an exhaust gas purifying apparatus using a DPF, it is necessary to regenerate the DPF by burning particulates collected by the DPF. As a method for burning the particulates, there is known a method in which an electric heater is provided in a portion where the particulates are collected by the DPF, and the particulates are heated to about 600 ° by the electric heater and burned.

However, in this method, it is necessary to use a large electric heater having a large capacity due to a high heating temperature. In addition, the particulates must be heated while the engine is stopped and external air is supplied. In addition, a large-scale device for sending air is required, and the structure becomes complicated. In addition, it takes several tens of minutes to reliably burn the particulates, so that the engine cannot be operated during that time, which is inconvenient.

Accordingly, instead of using such an electric heater, a platinum-based oxidation catalyst has been carried on the DPF. In such an exhaust gas purification device, the particulates are oxidized by the oxidation catalyst,
Combustion can be performed at a low temperature of about 300 ° C., and the collected particulates can be burned at the exhaust gas temperature of the engine. Therefore, the regeneration of DPF is simple,
In addition, there is a merit that it can be performed automatically while the engine is running.

However, the method of regenerating an exhaust gas purifying apparatus using an oxidation catalyst has a problem that sulfur components present in the exhaust gas react with platinum of the oxidation catalyst to generate sulfuric acid mist.

An object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can easily regenerate a particulate filter, generate almost no sulfuric acid mist, and can obtain a cleaner exhaust gas. It is in.

[0009]

According to the first aspect of the present invention, there is provided an exhaust gas purifying apparatus for an internal combustion engine, wherein a combustion aid having an oxidation promoting action is introduced into an intake passage of the internal combustion engine. Means, and a particulate filter provided in an exhaust passage of the internal combustion engine for trapping particulates in exhaust gas, wherein the trapped particulates are oxidized and burned by the injected auxiliary agent. It is characterized by.

According to the present invention, the auxiliary agent introduced into the intake passage is reduced by releasing oxygen by the oxidation promoting action in the cylinder, but is oxidized again by nitrogen oxides in the exhaust gas. As a result, the oxidation promoting action is restored, and finally the particulates are collected by the particulate filter together with the particulates. For this reason, the auxiliary agent collected by the particulate filter also functions as a kind of oxidation catalyst, and similarly oxidizes the particulate collected by the particulate filter. As a result, the oxidized particulates are reliably burned and removed even at the temperature of the exhaust gas, so that clogging of the particulate filter, that is, regeneration is easily performed. In this case, there is no need to use a conventional platinum-based oxidation catalyst, so there is no need to worry about the generation of sulfuric acid mist. Further, the generation of particulates in the exhaust gas itself is suppressed by the oxidation promoting action of the auxiliary agent in the cylinder, and the double effect of this suppression effect and the trapping effect of the particulate filter provides an external effect. Particulates in the exhaust gas discharged to the air are greatly reduced, and the exhaust gas becomes cleaner.

According to a second aspect of the present invention, there is provided the exhaust gas purifying apparatus for an internal combustion engine according to the first aspect of the present invention, wherein the auxiliary means is supplied at predetermined time intervals to control the amount of the auxiliary agent. It is characterized in that it is provided with a combustion aid introduction start means for starting introduction. In such an exhaust gas purifying apparatus, the use of the auxiliary agent is periodically performed at intervals of a predetermined time by the auxiliary agent input start means, so that the amount of the auxiliary agent used is reduced, which is economical.

According to a third aspect of the present invention, in the exhaust gas purifying apparatus for an internal combustion engine according to the second aspect, the predetermined time (input interval) is variably set according to an operation mode of the internal combustion engine. It is characterized by being provided.
In such an exhaust gas purifying apparatus, in the operation mode in which the amount of the particulates discharged from the internal combustion engine is increased, the predetermined time (charging interval) is shortened, and the auxiliary agent is frequently charged, so that the discharge amount is reduced. In the small operation mode, the predetermined time (input interval) is lengthened to prevent unnecessary input of the auxiliary agent.

According to a fourth aspect of the present invention, there is provided the exhaust gas purifying apparatus for an internal combustion engine according to the first aspect, wherein the accumulated amount of the particulate matter collected by the particulate filter is detected. Detection means and / or accumulation amount calculation means for calculating the accumulation amount;
Accumulation amount comparing means for comparing the accumulation amount based on the detection result and / or the calculation result with a predetermined amount,
When the accumulation amount of the particulates is determined to exceed the specified amount based on the comparison result of the accumulation amount comparison unit, a combustion assisting agent injection start unit that controls the combustion assisting unit and starts the injection of the combustion assisting agent. It is characterized by having. In such an exhaust gas purifying apparatus, since it is determined that a large amount of particulates has been accumulated in the particulate filter, the supplementary fuel is supplied, wasteful introduction of the supplementary fuel is reliably prevented, and the economical efficiency is also reduced. Thus, the same function and effect as those of the exhaust gas purifying apparatus of the second aspect can be obtained.

According to a fifth aspect of the present invention, there is provided the exhaust gas purifying apparatus for an internal combustion engine according to the fourth aspect, wherein the exhaust gas is provided before the particulate filter for each rotation speed and each load of the internal combustion engine. A storage unit in which the specified pressure of the upper limit of gas is stored in advance as a map, a rotation speed detection unit that detects a rotation speed of the internal combustion engine, and a load detection unit that detects a load of the internal combustion engine, The accumulation amount detection means is pressure detection means for detecting a pressure of exhaust gas before the particulate filter, and the accumulation amount comparison means is an arbitrary rotation speed detected by the rotation speed detection means and the load detection means. And the load detected by the pressure detecting means and the upper limit specified pressure in the map are compared with each other. If the pressure detected by the pressure detecting means is determined to have exceeded the specified pressure by,
The method is characterized in that the auxiliary means is started by controlling the auxiliary means. In such an exhaust gas purification device,
The amount of accumulated particulates in the particulate filter is estimated based on the pressure of the exhaust gas, and the upper limit specified pressure for each rotation speed and each load of the internal combustion engine is stored as a map in the storage means. For this reason, when an arbitrary number of revolutions, a load, and the pressure of exhaust gas are detected by the various detecting means during the operation of the internal combustion engine, the detected pressure is reliably compared with any specified pressure in the map. Therefore,
The amount of accumulated particulates (clogged state) can be determined with certainty, and the timing of charging the auxiliary agent can be accurately controlled.

According to a sixth aspect of the present invention, there is provided an exhaust gas purifying apparatus for an internal combustion engine according to the fourth aspect, wherein the particulate filter is provided for a predetermined range of rotation speed and a predetermined range of load of the internal combustion engine. A storage unit in which a predetermined upper limit pressure of exhaust gas is stored in advance; a rotation speed detection unit that detects a rotation speed of the internal combustion engine; and a load detection unit that detects a load of the internal combustion engine. In addition, the accumulation amount detection means is pressure detection means for detecting the pressure of the exhaust gas before the particulate filter, and the accumulation amount comparison means is a rotation speed detected by the rotation speed detection means and the load detection means. Only when it is determined that the load is within the predetermined range of rotation speed and the predetermined range of load, the pressure detected by the pressure detecting means and the stored upper limit are defined. Comparing the pressure with the power, the combustion aid introduction start means controls the combustion aid introduction means when it is determined by the accumulation amount comparison means that the pressure detected by the pressure detection means exceeds the upper limit specified pressure. And then start charging the combustion aid. In such an exhaust gas purifying apparatus, only when it is determined that the actually detected rotation speed and load are within the predetermined range of rotation speed and the predetermined range of load, the pressure detected by the pressure detection unit and the stored pressure are stored. Since the internal pressure is compared with the upper limit specified pressure, in the internal combustion engine which often operates at the predetermined range of rotation speed and the predetermined range of load, the comparison in other operating states is omitted, and the accumulated amount of particulates is determined. The logic for it is simplified.

According to a seventh aspect of the present invention, there is provided an exhaust gas purifying apparatus for an internal combustion engine according to any one of the fourth to sixth aspects, wherein the accumulated amount detecting means is provided before the particulate filter. And the accumulated amount comparison means compares the pressure detected by the pressure detection means with a preset upper limit specified pressure, and starts the combustion assisting agent injection. The means controls the fuel-supplying agent charging means to start charging of the fuel-supplying agent when the pressure detected by the pressure detecting means has exceeded the specified pressure by the accumulation amount comparing means, and is collected. A prescribed pressure updating means for updating the prescribed pressure to a new upper prescribed pressure based on the pressure immediately after the combustion of the particulates. In such an exhaust gas purifying apparatus, the specified pressure is updated by the specified pressure updating means. Therefore, even if the pressure immediately after the combustion of the particulates fluctuates due to the performance conversion of the particulate filter over time, the fluctuation is reliably detected. Can respond to. That is, it is possible to determine whether the increase in the pressure of the exhaust gas is caused by the accumulation of particulates, or the performance change of the particulate filter over time, or whether the increase is due to the accumulation of the combustion aid itself. Even in a particulate filter that has been used for a long time, the amount of accumulated particulates can be accurately determined.

According to an eighth aspect of the present invention, there is provided an exhaust gas purifying apparatus for an internal combustion engine according to any one of the second to seventh aspects, wherein the temperature of the particulate filter or the temperature of the exhaust gas is increased. And a temperature comparing means for comparing a temperature detected by the temperature detecting means with a preset specified temperature. When it is determined that the temperature detected by the detecting means has exceeded the specified temperature, the fuel-supplying-agent charging means is controlled to start feeding the fuel-assisting agent. In such an exhaust gas purifying device, when it is determined that the temperature detected by the temperature detecting means has exceeded the preset specified temperature, the auxiliary agent is supplied, so that the temperature of the particulate filter or the exhaust gas significantly decreases. When the internal combustion engine is low and the particulates do not burn even when the auxiliary agent is injected, the auxiliary agent is not actually input. Therefore, the auxiliary agent is not wasted and is more economical.

According to a ninth aspect of the present invention, there is provided an exhaust gas purifying apparatus for an internal combustion engine according to any one of the second to eighth aspects, wherein the temperature of the particulate filter or the temperature of the exhaust gas is increased. Temperature detection means for detecting the temperature, and a temperature comparison means for comparing the temperature detected by the temperature detection means with a preset specified temperature,
When the temperature comparison means determines that the temperature detected by the temperature detection means has fallen below the specified temperature, the control means controls the combustion aid addition means to stop the addition of the combustion aid. Means. In such an exhaust gas purifying device, when the temperature of the particulate filter or the exhaust gas decreases for some reason during the addition of the auxiliary agent, and the combustion of the particulate becomes difficult, the temperature comparison means and the temperature control unit are used. Since the injection of the combustion aid is stopped by the mold combustion aid introduction stop means, wasteful consumption of the combustion aid is prevented as in the case of the exhaust gas purifying apparatus of the seventh aspect.

According to a tenth aspect of the present invention, in the exhaust gas purifying apparatus for an internal combustion engine according to any one of the second to ninth aspects, the pressure of the exhaust gas before the particulate filter is reduced. A pressure detecting means for detecting, a pressure comparing means for comparing the pressure detected by the pressure detecting means with a predetermined lower limit specified pressure, and a pressure detected by the pressure detecting means by the pressure comparing means. A pressure-management-type auxiliary-fuel-supply-supply stopping means for controlling the auxiliary-fuel-supplying means and stopping the supply of the auxiliary material when it is determined that the pressure is lower than the set lower-limit prescribed pressure. . In such an exhaust gas purifying device, the pressure-management-type auxiliary-fuel-agent-supply stopping means determines that the collected particulates have been burned and removed based on the result of comparison by the pressure comparing means, so that the particulates have been removed. In this case, the auxiliary agent is not continuously supplied, and wasteful consumption of the auxiliary agent is reliably prevented.

According to an eleventh aspect of the present invention, there is provided the exhaust gas purifying apparatus for an internal combustion engine according to any one of the second to tenth aspects, wherein the time elapsed after the start of the addition of the auxiliary agent is set in advance. Time comparing means for comparing the specified time with the specified time, and when it is determined by the time comparing means that the elapsed time after the start of the charging has reached a predetermined time set in advance, the fuel controlling means is controlled. A time-management-type supplementary-fuel-supply-stopping means for stopping the supply of the supplementary fuel through the use of the fuel-supplying agent. In such an exhaust gas purification device,
The time comparison means and the time-management-type auxiliary-fuel-agent-supply-stopping means allow the auxiliary fuel to be supplied only for a predetermined period of time, so that wasteful consumption of the auxiliary fuel is also reliably prevented. Note that the predetermined time is a time required for the collected and accumulated particulates to be substantially completely burned and removed, and is a time that can be obtained in advance by an experiment or the like.

According to a twelfth aspect of the present invention, in the exhaust gas purifying apparatus for an internal combustion engine according to any one of the first to eleventh aspects, an oxidation catalyst is carried on the particulate filter. It is characterized by being. In such an exhaust gas purifying device, the combustion start temperature of the particulates is lowered even by the oxidation catalyst carried on the particulate filter, so that the particulates are burned more easily, and the regeneration of the particulate filter is performed more efficiently. However, when a platinum-based oxidation catalyst is used, the amount of platinum is limited so that sulfuric acid mist is hardly generated.

According to a thirteenth aspect of the present invention, there is provided an exhaust gas purifying apparatus for an internal combustion engine according to any one of the first to twelfth aspects, wherein the auxiliary agent introducing means is provided in the intake passage. It is characterized in that it is provided so that a combustion aid can be injected into the venturi. In such an exhaust gas purifying apparatus, the auxiliary agent is injected into the intake passage by utilizing the pressure difference generated in the venturi, so that the structure of the auxiliary agent input means is simplified.

According to a fourteenth aspect of the present invention, in the exhaust gas purifying apparatus for an internal combustion engine according to any one of the first to thirteenth aspects, the auxiliary agent includes a base metal oxide. It is characterized by having been done. In such an exhaust gas purifying apparatus, since a base metal oxide is used as a combustion assisting agent, a slight amount of sulfur contained in the fuel of the internal combustion engine is not oxidized, and no sulfuric acid component which is a catalyst poison is generated. Therefore, sulfuric acid poisoning, in which the catalytic action of the auxiliary agent is significantly reduced by the sulfuric acid component, is prevented.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a diesel engine 1 as an internal combustion engine equipped with an exhaust gas purification device 2 according to the present embodiment.

The diesel engine 1 has an engine body 10 having a plurality of cylinders (not shown). The engine body 10 has an intake system 20 for sending air to the cylinders and an exhaust system for exhausting exhaust gas. 30
And a cooling system 40 for cooling the engine body 10, the supercharger 50, and a portion requiring cooling such as an oil cooler (not shown).
And a supercharger 50 having a compressor 51 and a turbine 52, and an exhaust gas recirculation device (EGR device) 60 that extracts a part of the exhaust gas and recirculates it to the intake side.

Each cylinder of the engine body 10 is connected to an intake passage 21 forming an intake system 20 and an exhaust passage 31 forming an exhaust system 30 via a cylinder head (not shown). Also, the engine body 10 includes:
A fuel injection pump 11 for supplying pressurized fuel to a fuel injection nozzle (not shown) is provided. The fuel injection amount and fuel injection time from the fuel injection nozzle into the cylinder are:
The operation is determined by the operation of the fuel injection pump 11, and the operation of the fuel injection pump 11 is controlled by the engine controller 70.

The intake system 20 includes an intercooler 22 provided in the intake passage 21 described above. The compressor 51 of the supercharger 50 is arranged on the upstream side of the intercooler 22. The inlet side of the compressor 51 is connected to an air cleaner (not shown), and the outlet side of the compressor 51 is connected to the intercooler 22. The outlet of the intercooler 22 communicates with each cylinder via the intake passage 21.

The exhaust system 30 includes the exhaust passage 31 described above.
And a DPF muffler 81 provided on the downstream side of the exhaust passage 31, and a turbine 52 of the supercharger 50 is arranged on a side of the exhaust passage 31 near the cylinder.

The cooling system 40 includes a water pump 41 driven by a crankshaft or the like, and the coolant is pumped by the water pump 41. The cooling liquid is air-cooled by a radiator 42 provided in the cooling system 40. The cooling effect of the radiator 42 and the intercooler 22 of the intake system 20 is promoted by a fan 43 driven by a crankshaft or the like.

The supercharger 50 is generally used for a diesel engine, and is generally mounted on a diesel engine for a construction machine which requires a particularly large output torque.

The exhaust gas recirculation device 60 connects the intake passage 21 and the exhaust passage 31 of the diesel engine 1 to the recirculation passage 6.
1 and an EG for adjusting the degree of opening of the conduit of the return path 61
It has an R valve 62, an intake throttle valve 63 arranged in the middle of the intake passage 21, and an EGR cooler 64 provided downstream of the EGR valve 62. It operates by setting the atmospheric pressure to a negative pressure with respect to the exhaust pressure. That is, the exhaust gas can be recirculated.

More specifically, one end of the recirculation passage 61 is connected to the intake passage 2.
The other end is connected to the downstream side of the intercooler 22, and the other end is connected to the exhaust passage 31 on the upstream side of the turbine 52.
The EGR valve 62 is composed of, for example, a butterfly valve, and adjusts the degree of opening of the pipeline by appropriately rotating a disk disposed in the recirculation passage 61, whereby the exhaust gas recirculated from the exhaust passage 31 to the intake passage 21 is adjusted. The amount of gas can be adjusted. The intake throttle valve 63 is arranged on the upstream side of the compressor 51 in the intake passage 21. The intake throttle valve 63 has a configuration similar to that of the EGR valve 62, so that the intake flow rate to the cylinder can be adjusted and the EGR amount can be controlled. Each of the EGR valve 62 and the intake throttle valve 63 is provided with an actuator (not shown).
The operation is controlled at 0.

The engine controller 70 includes a governor provided in the fuel injection pump 11 and an EG of the exhaust gas recirculation device 60.
It controls the R valve 62, the intake throttle valve 63, etc., and receives a rotation speed signal indicating the rotation speed of the diesel engine 1 and a fuel injection amount signal indicating the amount of fuel injected and supplied into the cylinder. You. Therefore, the engine body 1
0 and the fuel injection pump 11 are provided with a rotation speed sensor 12 as rotation speed detecting means for detecting the rotation speed in order to obtain the engine speed signal and the fuel injection amount signal described above.
And a fuel injection amount sensor (rack sensor) 13 as load detection means for detecting the amount of fuel injected into the cylinder.

The rotation speed sensor 12 outputs to the engine controller 70 a signal corresponding to the rotation speed (rotation speed) of a crankshaft, a flywheel or the like provided on the engine body 10 of the diesel engine 1.

The fuel injection amount sensor 13 detects the position of a control rack slidably provided on the plunger in order to adjust the injection amount of fuel injected from the fuel injection pump 11. A signal corresponding to the position of the control rack is output to the engine controller 70. When a high-pressure fuel injection device including a common rail and an injector is used as the fuel injection device for the diesel engine 1, the fuel injection amount sensor 13
A signal corresponding to the fuel injection amount determined by the injector opening time and the fuel pressure in the common rail is output to the engine controller 70.

Hereinafter, the most characteristic exhaust gas purifying apparatus 2 of the present embodiment will be described. The exhaust gas purifying device 2 discharges together with the exhaust gas from the cylinder by introducing a combustion aid comprising cerium oxide (CeO ₂ ), which is a base metal oxide, into the intake passage 21 as necessary. The particulate matter accumulated in the DPF muffler 81 is burned by this auxiliary agent, and thus the DPF muffler 81 is regenerated. Such an exhaust gas purifying device 2 controls the DPF muffler 81, a fuel-supplying agent feeding device 82 provided as a fuel-supplying agent feeding means provided in the Venturi 23 portion of the intake passage 21, and controls the start and stop of the feeding of the fuel-assistant. And the auxiliary combustion agent controller 83 that performs the operation.

The DPF muffler 81 has a columnar DPF 811 shown in FIG. 2 disposed inside the housing. The DPF 811 is made of a ceramic made of cordierite or silicon carbide, and the exhaust gas flows in from the upstream side as shown in a cross section along the flow direction of the exhaust gas,
In addition, the inlet side flow path 811A whose downstream side is plugged and the exhaust side flow path 811B whose upstream side is plugged and exhaust gas is exhausted from the downstream side are formed in a staggered manner.
A boundary wall portion 811C of each of the flow paths 811A and 811B has a random porous shape, and particulates in the exhaust gas are collected by the boundary wall portion 811C. To accumulate.

[0038] In the upstream part of the DPF 811,
An oxidation catalyst 811D is supported. Oxidation catalyst 811D
The amount of platinum is extremely small compared to the oxidation catalyst described in the background art, and is such an amount that almost no sulfuric acid mist is generated.

Immediately before (upstream) the DPF 811 of the DPF muffler 81, a pressure sensor 812 as pressure detecting means for measuring the pressure of the exhaust gas, and a temperature sensor 813 as a temperature detecting means for detecting the temperature of the exhaust gas are provided. Is provided, and a pressure signal and a temperature signal corresponding to the pressure and temperature detected by the pressure sensor 812 and the temperature sensor 813 are output to the auxiliary fuel controller 83.

The auxiliary fuel injection device 82 includes an auxiliary fuel tank 821 in which an auxiliary fuel is stored, and an input valve 823 provided in a supply pipe 822 between the auxiliary fuel tank 821 and the venturi 23. Are electrically connected to a combustion aid controller 83, and the opening and closing are controlled by the combustion assistance controller 83.

As shown in FIG. 3, the auxiliary agent controller 83 includes a pressure signal, a temperature signal, and a pressure signal from the DPF muffler 81.
And an input unit 831 to which a rotation speed signal and a fuel injection amount signal from the engine controller 70 are input, and a storage unit 832 in which pressure, temperature, rotation speed, and fuel injection amount based on the input signals are stored as data. And an arithmetic processing unit 833 that performs arithmetic processing based on the data stored in the storage unit 832, the specified values described below, and various programs, and outputs an open / close signal to the injection valve 823 of the auxiliary fuel injection device 82. An output unit 834 is provided, and the map unit 84 shown in FIG.

The map 84 is used to extract the upper limit specified pressure P corresponding to each rotation speed (horizontal axis) of the diesel engine 1 and each fuel injection amount as a load (vertical axis). In other words, in the present embodiment, the pressure of the exhaust gas immediately before the DPF 811 increases with the accumulation of the particulates. The pressure at the time of the injection amount is detected by the pressure sensor 812, and when this pressure exceeds the corresponding specified pressure P in the map 84, it is determined that a large amount of particulates has been collected and accumulated in the DPF 811. Then, based on this determination, a combustion aid is supplied, and the DPF 811 is regenerated by burning the particulates.

In order to realize the regeneration of the DPF 811, the arithmetic processing unit 833 of the auxiliary fuel controller 83 includes a prescribed pressure initial setting / updating means 833 A as prescribed pressure updating means, an exhaust pressure comparing means 833 B, an exhaust temperature Comparison means 833C, combustion aid introduction start means 833D, time comparison means 833E, temperature management type combustion aid introduction stop means 833
F, time-management type auxiliary burner charging stop means 833G, and D
PF exchange means 833H is provided. Each of these units 833A to 833H comprises a program (software) stored in the storage unit 832.

The prescribed pressure initial setting / updating means 833A
Specified pressure P when DPF 811 is used as new
Is a means for calculating and setting a new specified pressure P while the DPF 811 is continuously used, and updating the specified pressure P according to the use progress of the DPF 811.
Is set and updated.

The exhaust pressure comparing means 833B is the accumulated amount comparing means of the present invention, and compares the pressure detected by the pressure sensor 812 with the specified pressure P in the map 84, and the detected pressure exceeds the specified pressure P. If the detected pressure is lower than the specified pressure P, it is determined that it is necessary to regenerate the DPF 811 by burning the particulates. It is determined that there is no need to reproduce the DPF 811.

The exhaust gas temperature comparing means 833C compares the temperature of the exhaust gas based on the temperature signal from the temperature sensor 813 with the lower limit specified temperature stored in the storage means 832 in advance. Determine if the temperature is sufficient.

When the exhaust pressure comparison means 833B determines that it is necessary to regenerate the DPF 811 by burning the particulates, the auxiliary combustion agent initiating means 833D outputs a signal to start the injection of the auxiliary fuel, if necessary.
The opening / closing signal is output from the output unit 834 to open the charging valve 823 to start charging the combustion aid.

The time comparing means 833E comprises a timer or the like, and determines whether or not a specified time has been reached after the start of the introduction of the combustion aid by the combustion aid introduction start means 833D.

Temperature control type auxiliary combustion agent supply stopping means 833F
Means that the exhaust gas temperature comparing means 833
When it is determined by C that the exhaust gas has dropped below the temperature required for the combustion of the particulates, a signal for stopping the addition of the auxiliary agent is output to the output unit 834, and an opening / closing signal is output from the output unit 834 to supply the input valve. 823 is closed, and the injection of the auxiliary agent is stopped.

Time-management type auxiliary combustion agent supply stopping means 833G
Outputs a signal to the output unit 834 to stop the injection of the auxiliary fuel when the input time after the start of the input of the auxiliary fuel by the auxiliary agent input start means 833D is determined by the time comparison means 833E to have reached the specified time. Then, an opening / closing signal is output from the output unit 834 to close the charging valve 823, and the charging of the auxiliary agent is stopped.

The DPF exchange means 833H includes a DPF 811
Is a means for determining that the number of times of reproduction has reached a predetermined number of times, and outputs a signal corresponding to the determination result to the output unit 83.
4 is output. Then, the output unit 834 outputs a replacement signal (not shown) to warn the user and prompts the user to replace the DPF 811.

According to the exhaust gas purifying apparatus 2 described above, the auxiliary agent introduced into the intake passage 21 improves the combustion efficiency by the action of promoting oxidation in the cylinder, and suppresses the generation of particulates. In addition, particulates in the exhaust gas generated by avoiding the suppression and the auxiliary agent discharged together with the exhaust gas are collected by the DPF 811.
At this time, the auxiliary agent that has released oxygen in the cylinder is oxidized again by nitrogen oxides in the exhaust gas while passing through the exhaust passage 31. For this reason, the auxiliary agent trapped in the DPF 811 acts as an oxidation catalyst for oxidizing the particulates, and lowers the combustion start temperature of the collected and accumulated particulates.

Hereinafter, the process related to the regeneration of the DPF 811 of the exhaust gas purifying apparatus 2 will be described with reference to the flowchart shown in FIG. It is assumed that a new DPF 811 is mounted on the DPF muffler 81, and a description will be given below.

Steps (hereinafter, the steps are simply abbreviated as “S”) 1: First, when the diesel engine 1 is driven, the engine controller 70 outputs a rotation speed signal and a fuel injection signal from the rotation speed sensor 12 and the fuel injection pump 11, respectively. The input signal is input, and accordingly, the input unit 831 of the auxiliary fuel controller 83 inputs the rotation speed signal and the fuel injection amount signal from the engine controller 70. Further, the auxiliary agent controller 83 inputs pressure signals from the pressure sensor 812, and detects the rotational speed, the fuel injection amount,
The pressure is stored in the storage means 832.

S2: Next, it is determined whether or not to set or update the upper limit specified pressure P in the map 84 stored in the storage means 832. In this embodiment, a new D
When the PF 811 is attached, the update determination value M1 and the number of reproductions R1 are cleared, and are both "0" at the present time. Therefore, it is determined that the initial setting of the specified pressure P is necessary, and the process proceeds to S3.

S3: Here, at an arbitrary rotational speed and fuel injection state immediately after the operation of the engine 1, the pressure at that time (the pressure at which no particulate matter is accumulated at present) is detected. The detected pressure is multiplied by a predetermined coefficient to calculate an initial specified pressure P at the rotation speed and the fuel injection amount, and the specified pressure P is stored in a corresponding position on the map 84. Further, based on the interrelationship between the specified pressure, the number of revolutions, and the fuel injection amount that has been clarified in advance by experiments or the like, the map 84 corresponding to the other number of rotations and the fuel injection amount based on the stored specified pressure P calculating all specified pressure P (P ₁₁ ~Pnn) of
Store.

S4: Next, "1" is added to the update determination value M1, so that M1 ≠ 0. As described above, S2 to S4 are performed by the prescribed pressure initial setting / updating unit 833A.

S5: Thereafter, the exhaust pressure comparison means 833B of the auxiliary fuel agent controller 83 operates one by one during the operation of the engine 1.
A comparison is made as to whether the exhaust gas pressure at an arbitrary rotation speed and fuel injection amount has exceeded a specified pressure P, and the process returns to S1 to monitor until the pressure exceeds the specified pressure P. During the monitoring of the pressure, since M1 ≠ 0, the initial setting and updating of the specified pressure P are not performed.

S6: If it is determined in S5 that the pressure of the exhaust gas exceeds the specified pressure P and that the DPF 811 has accumulated a large amount of particulates, the auxiliary agent controller 8
3 inputs a temperature signal from the temperature sensor 813.

S7: Then, the exhaust gas temperature comparing means 833C
Compares the temperature C1 based on the temperature epicenter with the lower limit specified temperature C stored in advance in the storage means 832 to determine whether the exhaust gas is at a temperature sufficient for particulate combustion. If not, the process returns to S1 to continue monitoring the exhaust gas pressure and temperature.

S8: If it is determined in S7 that the exhaust gas temperature C1 exceeds the specified temperature C, the process proceeds to regeneration of the DPF 811. Before that, the DPF exchange means 833H checks the number of regenerations. Since the number of times of reproduction R1 is "0" and does not exceed the predetermined number of times R, the process proceeds to S9. Note that the specified number R is the number of times the DPF 811 can be reproduced, and when the specified number R is exceeded, the DPF 811
Need to be replaced with a new one.

S9: After that, the means 833 for initiating introduction of the auxiliary agent.
D outputs a signal instructing the start of auxiliary fuel injection, opens the input valve 823 of the auxiliary fuel injection device 82, inputs the auxiliary fuel, and starts the combustion of the particulates accumulated in the DPF 811. At the same time, the time comparison means 8
33E starts time measurement by a timer.

S10: When the combustion of the particulates is started, the exhaust gas temperature comparing means 833C again compares the temperature of the exhaust gas with the lower limit specified temperature C stored in the storage means 832, and determines whether the exhaust gas is particulate. Determine if the temperature is sufficient for combustion. If it is enough,
Proceed to S11.

S11: Here, the injection time T1 of the auxiliary agent
The time comparison means 833E monitors whether or not has reached the prescribed time T prescribed in advance.

S12: When the time comparison means 833E determines that the time T1 for adding the auxiliary fuel has reached the specified time T, the time management type auxiliary fuel injection stop means 833G closes the input valve 823 and turns off the auxiliary fuel. Stop feeding. Thus, the first regeneration of the DPF 811 is completed.

S13: Here, "1" is set for the number of reproductions R1.
Is added to make R1 ≠ 0.

S14: Then, both the update determination value M1 and the injection time T1 are returned to "0" by the prescribed pressure initial setting / updating means 833A and the time comparing means 833E. Thereafter, the process returns to S1.

Subsequently, when the process proceeds to S1 and S2, this time, M
Although 1 = 0, R1 再生
Since it is 0, the process moves to S15 after S2.

S15: Here, the prescribed pressure initial setting / updating means 833A updates the prescribed pressure P in the map 84. The updating procedure is such that, at an arbitrary rotational speed and a fuel injection state immediately after the regeneration of the DPF 811, the pressure at that time (the pressure immediately after the regeneration) is detected, and the detected pressure is multiplied by a predetermined coefficient to obtain the rotational speed and the fuel. A new specified pressure P for the injection amount is calculated, and the specified pressure P is restored (updated) to a corresponding position on the map 84. Also, by default the same method to calculate all the map 84 corresponding to the other rotational speed and the fuel injection amount of the specified pressure P (P ₁₁ ~Pnn), re-store (update).

The update of the prescribed pressure P is performed by M1 = 0
, That is, the DPF 811 is reproduced and the update determination value M
Performed each time 1 is cleared. On the other hand, the above-mentioned initial setting of the specified pressure P is performed only when the DPF 811 is replaced.

In S10, if the exhaust gas temperature comparing means 833C determines that the temperature of the exhaust gas becomes lower than the combustible temperature of the particulates for some reason during the combustion of the particulates, the process proceeds to S16.

S16: Here, the temperature control type auxiliary combustion agent supply stopping means 833F outputs a signal for instructing the stop of the supply of the auxiliary combustion material to the output section 834, and closes the supply valve 823 to stop the supply of the auxiliary combustion material.

Further, based on the above procedure, the DPF 81
When the reproduction of 1 is repeated the specified number of times R, the DPF exchange unit 833H determines that the number of reproductions R1 = the specified number of times R in S8, and proceeds to S17.

S17: Then, DPF exchange means 833H
Outputs an exchange signal (not shown) to warn that the DPF 811 cannot be regenerated anymore.
Prompt for replacement of 11.

According to the present embodiment, the following effects can be obtained. (1) In the exhaust gas purifying apparatus 2, the cerium oxide auxiliary agent introduced into the intake passage 21 is reduced by releasing oxygen by the oxidation promoting action in the cylinder, but the nitrogen oxides in the exhaust gas are reduced. Again, thereby recovering the oxidation promoting action, and acts as an oxidation catalyst when collected by the DPF 811. Therefore, by oxidizing the particulates collected by the DPF 811 with a combustion aid, the burning start temperature of the particulates is lowered to about 300 ° C., so that the particulates can be reliably burned and removed even at the temperature of the exhaust gas. In addition, clogging of the DPF 811 can be eliminated to facilitate regeneration.

(2) In this case, unlike the conventional case, a large amount of platinum in the oxidation catalyst is not used, so that the generation of sulfuric acid mist can be suppressed.

(3) In addition, the combustion promoting effect of the auxiliary agent in the cylinder improves the combustion efficiency and suppresses the generation of particulates in the exhaust gas. This suppressive effect and the trapping effect of the DPF 811 are also achieved. Due to the double effect of the above, the particulates in the exhaust gas discharged to the outside can be remarkably reduced, and the exhaust gas can be further cleaned.

(4) In addition, by improving the combustion efficiency of the combustion aid, the generation of hydrocarbons and carbon monoxide can be suppressed, and the combustion release agent that has released oxygen is reduced by nitrogen oxides during passage through the exhaust passage 31. Since it is oxidized again, oxygen can be released from the nitrogen oxide to reduce the nitrogen oxide.

(5) In the exhaust gas purifying apparatus 2, based on the pressure signal from the pressure sensor 812, the exhaust pressure comparing means 833
B determines the accumulation state of the particulates, and according to the result of the determination, the auxiliary combustion agent initiating means 833D starts the injection of the auxiliary medium. Therefore, when a large amount of the particulates is accumulated in the DPF 811, the auxiliary medium is surely supplied. To prevent wasteful consumption of the auxiliary agent.

(6) Further, the upper limit specified pressure P to be compared with the detected pressure is stored in the map 84 for each rotation speed of the diesel engine 1 and each fuel injection amount. of the pressure of the exhaust gas at any speed and load during operation, of the specified pressure P ₁₁ ～Pnn in the map 84, one of the specified pressure P and can be reliably compared. For this reason, it is possible to reliably determine the amount of accumulated particulates, and it is possible to accurately control the timing of adding the auxiliary agent.

(7) The specified pressure P is equal to DPF8
11 is updated by the specified pressure initial setting / updating unit 833A based on the pressure immediately after the regeneration detected every regeneration of the DPF 1111. When the pressure immediately after the regeneration, which is originally considered to be not accumulating particulates, such as when the accumulation amount of the gas becomes large, a new specified pressure P can be set in consideration of the fluctuation,
Even if the DPF 811 has been used for a long time, the amount of accumulated particulates can be accurately determined.

(8) Further, the specified pressure initial setting / updating means 833A performs the initial setting of the specified pressure P in the map 84 when the DPF 811 is replaced with a new one, so that the specified pressure P before replacement is maintained as it is. The determination of the amount of accumulated particulate after the exchange can be performed accurately.

(9) Since the auxiliary agent controller 83 of the exhaust gas purifying apparatus 2 is provided with the time comparing means 833E and the time management type auxiliary auxiliary agent supply stopping means 833G, the specified time T is reached after the auxiliary agent is supplied. Then, the injection of the auxiliary agent can be automatically stopped, and the unnecessary consumption of the auxiliary agent can be prevented.

(10) In the auxiliary combustion agent controller 83, the temperature detected by the temperature sensor 813 is used as the exhaust gas temperature comparing means 833.
C is compared with the specified temperature C to determine whether or not the exhaust gas is at a temperature suitable for introducing the auxiliary agent.
Therefore, when the temperature of the exhaust gas is extremely low and the particulate matter does not burn even when the auxiliary agent is injected, the injection of the auxiliary agent can be prevented at the time of starting the engine 1 or the like. Accordingly, also in this respect, there is no need to worry about wasteful consumption of the auxiliary agent, which is more economical.

(11) In the combustion aid controller 83,
If the temperature of the exhaust gas drops for some reason during the introduction of the combustion aid and the combustion of the particulates becomes difficult, the combustion temperature control means 833C and the temperature management type combustion aid introduction stop means 833F use the combustion aid. Can be stopped, and wasteful consumption of the auxiliary agent can be more reliably prevented.

(12) DPF 811 used in this embodiment
Since the oxidation catalyst 811D is supported on the upstream side, the combustion start temperature of the particulates can be lowered by the oxidation catalyst 811D, and the DPF 811 can be more efficiently regenerated and the DPF 811 can be more efficiently regenerated. .
At this time, a platinum-based oxidation catalyst 811D is used. However, since the amount of platinum is extremely small as compared with the conventional case, sulfuric acid mist is hardly generated.

(13) Since the auxiliary agent charging device 82 constituting the exhaust gas purifying device 2 is provided so that the auxiliary agent can be injected into the venturi 23 provided in the intake passage 21, the pressure difference generated in the venturi 23 is reduced. Utilizing the auxiliary agent, the auxiliary agent can be reliably and easily injected into the intake passage 21, and the structure of the auxiliary agent input device 82 can be simplified.

(14) Since the auxiliary agent used in the present embodiment is cerium oxide, which is a base metal oxide, it does not oxidize the sulfur contained in the fuel of the diesel engine 1 slightly, and is a sulfuric acid which becomes a catalyst poison. The generation of components can be prevented.
Therefore, sulfuric acid poisoning, in which the catalytic action of the combustible is significantly reduced by the sulfuric acid component, can be prevented, and the catalytic action of the combustible can be favorably maintained.

The present invention is not limited to the above-described embodiment, but includes other configurations that can achieve the object of the present invention, and also includes the following modifications.
For example, in the above-described embodiment, whether or not the auxiliary fuel is to be injected is determined by comparing the pressure P1 detected by the pressure sensor 812 as the pressure detecting unit with a preset specified pressure P. For example, the means for initiating the addition of the auxiliary agent is DPF.
Irrespective of the pressure immediately before 811 or the like, it may be provided such that the auxiliary agent can be periodically injected at intervals of a predetermined time, and such a case is included in claim 2 of the present invention. And also in such a case, since the auxiliary agent is periodically added,
It is economical because the amount of combustion aid used is reduced.

Further, such a predetermined time may be changed in accordance with the operation mode of the engine. In such a case, in the operation mode in which the amount of particulates discharged from the engine increases, the predetermined time may be changed. By shortening the time (injection interval) and frequently injecting the auxiliary agent, D
In the operation mode in which the PF 811 can be surely regenerated and the amount of discharge is small, use of the auxiliary agent can be prevented from being wasted by increasing the predetermined time (input interval).

The variable predetermined time (input interval) can be favorably used, for example, in construction machines in which the operation mode of the engine changes depending on the operation mode.
At this time, as a work mode, for example, when the construction machine equipped with the diesel engine 1 is a wheel loader, V-shape loading (or cross drive loading) for loading, leveling work to level the ground, normal running, idling, and the like There is.

In these work modes, the fuel injection amount (load) of the diesel engine 1 changes in a substantially constant cycle. For example, in the case of V-shape loading, when a work object such as soil is scooped into a bucket, the fuel injection amount is large (high load), and when the work object is loaded on a truck or the like, the fuel injection amount is small (low load). ), And the magnitude of the fuel injection amount (high load and low load) is repeated in a constant cycle.

In such a work mode, the driver operates a switch for selecting the work mode, and a signal output from this switch is input to the engine controller 70, so that the engine controller 70 The operation mode may be one that recognizes which operation mode, and the state of the rotation speed and the fuel injection amount of the diesel engine 1 is detected, and the cycle of the rotation speed and the fuel injection amount of the various operation modes is detected. By applying the pattern to a pattern, it may be possible to recognize which operation mode it is.

In the above embodiment, the diesel engine 1
A map 84 in which a specified pressure P is set for each rotation speed and each combustion injection amount is used, and the pressure at an arbitrary rotation speed and fuel injection amount is determined by using any one of the specified pressures P in the map 84. However, for example, a specified pressure P at a predetermined rotation speed and a fuel injection amount is set, and only when the engine 1 is driven at the rotation speed and the fuel injection amount, the pressure of the exhaust gas is detected. The detected pressure may be compared with the specified pressure P.

More specifically, as shown in FIG.
And only the specified pressure P at the fuel injection amount F is set, and the rotation speed N1 and the fuel injection based on the signals from the rotation speed sensor 12 and the fuel injection amount sensor 13, as shown in S2 of the flowchart of FIG. Only when the amount F1 matches the rotation speed N in the predetermined range and the fuel injection amount F in the predetermined range, the process proceeds to S3 and S4 (hereinafter, the same as the flow of the embodiment shown in FIG. 5), and the DPF 811 is regenerated. . Such a case is included in claim 6 of the present invention.

This is often the case when the engine is driven in a specific operation mode, such as an engine used for construction equipment, or when it is used at a rated rate, such as a stationary engine used for a generator. This is effective only when it is clear that the driving is performed only at the predetermined rotation speed N and the fuel injection amount F, and the comparison in other operating states can be omitted. Therefore, in this case, in order to correspond to any of the rotational speed and the fuel injection amount, a number of specified pressure P (P ₁₁ ~Pnn)
There is no need to prepare a complex map 84 having
The logic for judging the reproduction of F811 can be simplified, and the capacity of the storage means 832 can be reduced. Further, initial setting and updating of the specified pressure P can be easily performed. In such a modification, a plurality of predetermined ranges of the rotational speed N and a plurality of predetermined ranges of the fuel injection amount are set in accordance with the plurality of operation modes of the engine (for example, the plurality of operation modes of the construction machine described above). A plurality of prescribed pressures P corresponding to F may be set.

Further, in the above-described embodiment, as means for stopping the charging, the temperature-controlling type auxiliary combustion agent charging stopping means 833 is used.
Although the F and time management type auxiliary combustion agent supply stopping means 833G was provided, the invention is not limited to this. When the pressure detected by the pressure sensor 812 falls below a predetermined lower limit specified pressure, the auxiliary combustion agent is stopped. A pressure-management type auxiliary combustion agent charging means for stopping the charging may be provided. In this case, the exhaust pressure comparison means 833B may be used as a pressure comparison means so as to compare the detected pressure with the specified pressure for adjustment. Such a case is included in claim 10 of the present invention.

In the above embodiment, the pressure sensor 812 is used as the accumulation amount detecting means, and the exhaust pressure comparing means 833B is used as the accumulation amount comparing means.
A flow meter or the like provided immediately after (downstream side) is used as the accumulated amount detecting means according to the present invention, and by setting a specified flow rate in advance, the flow rate for comparing the specified flow rate with the detected flow rate is determined. The comparing means may be the accumulation amount comparing means according to the present invention.

Further, the amount of particulate emission for each rotation speed and each fuel injection amount (load) experimentally obtained is stored in advance in the storage means 832 as a map, and an arbitrary rotation speed and fuel injection amount ( Emissions at the time of (load) are extracted one by one from the map, the total emission of particulates is calculated from this emission and the elapsed elapsed time, and the calculated total emission and the preset prescribed total emission are calculated. In comparison, when the total discharge reaches the prescribed total discharge, a combustion aid may be introduced. In this case, the accumulation amount is estimated based on the total emission amount, and the means (program) for calculating the total emission amount is the accumulation amount calculation means according to the fourth aspect.

In the above embodiment, the temperature sensor 813 detects D
Although the temperature immediately before the PF 811 was detected, the temperature of the DPF 811 itself may be detected by the temperature sensor 813.
Even in such a case, the temperature sensor 813 can be used as a temperature detecting unit according to the present invention.

In the above embodiment, the turbocharger driven by the exhaust gas has been described as the supercharger. However, the supercharger is not limited to this. It may be a mechanically driven supercharger driven by a source. However, the supercharger is not an essential component of the present invention,
It can be omitted. Further, the exhaust gas recirculation device 60 in the above embodiment may be provided as needed, and even if omitted, it is included in the present invention. Further, the internal combustion engine is not limited to a compression ignition type diesel engine, but may be a spark ignition type internal combustion engine such as a gasoline engine, or may be a naturally aspirated type that does not perform supercharging.

In addition, the auxiliary agent is not limited to cerium oxide, but may be iron oxide, magnesium oxide,
Strontium oxide or the like may be used, and can be appropriately selected and used from base metal oxides.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an internal combustion engine including an exhaust gas purification device according to an embodiment of the present invention.

FIG. 2 is a perspective view and a sectional view showing a particulate filter of the exhaust gas purifying apparatus.

FIG. 3 is a block diagram illustrating a configuration of a part that controls the exhaust gas purification device.

FIG. 4 is a schematic diagram showing a map for controlling the exhaust gas purification device.

FIG. 5 is a flowchart showing a flow when the exhaust gas purifying apparatus is regenerated.

FIG. 6 is a schematic diagram showing a modification of the present invention.

FIG. 7 is a flowchart in the modified example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Diesel engine which is an internal combustion engine 12 Rotational speed sensor which is a rotation speed detecting means 13 Fuel injection amount sensor which is a load detecting means 21 Intake passage 23 Venturi 31 Exhaust passage 82 Combustion agent charging device which is a fuel injection device 84 Map 811 Party Cured filter (DPF) 811D Oxidation catalyst 812 Pressure sensor as pressure detecting means as accumulated amount detecting means 813 Temperature sensor as temperature detecting means 832 Storage means 833A Prescribed pressure setting / updating means as prescribed pressure updating means 833B Storage amount comparison Exhaust pressure comparing means 833C Exhaust temperature comparing means 833D Combustion agent introduction start means 833E Time comparison means 833F Temperature management type combustion aid introduction stop means 833G Time management type combustion aid introduction stop means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F02M 25/00 F02M 25/00 K R TZ // F02M 25/07 570 25/07 570J F-term (reference 3G062 AA01 BA04 ED08 GA04 GA05 GA06 GA09 GA15 GA22 3G090 AA02 BA01 CA01 DA02 DA12 DA18 DA20 EA05 EA06 EA08 3G092 AA02 AA06 AA17 AA18 AB03 AB13 AB18 BB20 DB03 FA18 HB01Z HD02Z HD08Z HE01Z

Claims (14)

[Claims] 1. A combustion aid charging means (82) for charging a combustion promoting agent having an oxidation promoting action into an intake passage (21) of the internal combustion engine (1), and an exhaust passage (31) of the internal combustion engine (1). And a particulate filter (811) provided for collecting particulates in the exhaust gas, wherein the collected particulates are oxidized and burned by the added auxiliary agent. An exhaust gas purification device (2) for the engine (1). 2. An exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to claim 1, wherein said auxiliary means (82) is controlled at predetermined time intervals to start charging of said auxiliary agent. Fuel injection start means (833D)
An exhaust gas purifying apparatus for an internal combustion engine (1), comprising: 3. The exhaust gas purifying apparatus for an internal combustion engine (1) according to claim 2, wherein the predetermined time is variably set according to an operation mode of the internal combustion engine (1). Internal combustion engine (1)
Exhaust gas purification equipment. 4. An exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to claim 1, wherein the accumulated amount detecting means detects an accumulated amount of the particulates collected by the particulate filter (811). And / or an accumulation amount calculating means for calculating the accumulation amount, and an accumulation amount comparing means (8) for comparing an accumulation amount based on the detection result and / or the calculation result with a preset prescribed amount.
33B), and when it is determined that the accumulated amount of the particulates exceeds the specified amount based on the comparison result of the accumulated amount comparing means (833B), the auxiliary fuel injection means (82) is controlled to input the auxiliary fuel. An exhaust gas purifying apparatus (2) for an internal combustion engine (1), characterized by comprising means for starting combustion of a combustion aid (833D). 5. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to claim 4, wherein the internal combustion engine (1) has a rotation speed and a load before each particulate filter (811). A storage unit (832) in which a predetermined upper limit pressure of exhaust gas is stored in advance as a map (84); a rotation speed detection unit (12) for detecting a rotation speed of the internal combustion engine (1); ) Load detection means (1)
3) and the accumulated amount detecting means is a pressure detecting means (812) for detecting the pressure of the exhaust gas before the particulate filter (811), and the accumulated amount comparing means (833B) The pressure detection means (81) at an arbitrary rotation speed and load detected by the rotation speed detection means (12) and the load detection means (13).
The pressure detected in 2) is compared with the upper limit specified pressure in the map (84), and the auxiliary fuel injection start means (833D) is provided by the accumulated amount comparison means (833B) to the pressure detection means (812).
When it is determined that the pressure detected in the step (c) exceeds the specified pressure, the control of the combustion assisting means (82) to start the combustion assisting is started, and the exhaust gas purification of the internal combustion engine (1) is performed. Apparatus (2). 6. The exhaust gas purification device (2) for an internal combustion engine (1) according to claim 4, wherein the particulate filter (811) for a predetermined range of rotation speed and a predetermined range of load of the internal combustion engine (1). A) a storage means (832) in which the specified upper limit pressure of the exhaust gas is stored beforehand; a rotation speed detection means (12) for detecting a rotation speed of the internal combustion engine (1); and the internal combustion engine (1). Load detecting means (1) for detecting the load of
3) and the accumulated amount detecting means is a pressure detecting means (812) for detecting the pressure of the exhaust gas before the particulate filter (811), and the accumulated amount comparing means (833B) The pressure detection means (8) only when it is determined that the rotation speed and the load detected by the rotation speed detection means (12) and the load detection means (13) are within the predetermined range of rotation speed and the predetermined range of load.
The pressure detected in step 12) is compared with the stored upper limit specified pressure, and the auxiliary fuel injection start means (833D) is operated by the accumulation amount comparison means (833B).
The internal combustion engine (1), characterized in that when it is determined that the pressure detected in (1) has exceeded the upper limit specified pressure, the combustion assisting agent introduction means (82) is controlled to start the combustion assisting agent introduction.
Exhaust gas purification equipment. 7. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to any one of claims 4 to 6, wherein the accumulated amount detecting means is provided in front of the particulate filter (811). A pressure detecting means (812) for detecting the pressure of the exhaust gas, and the accumulated amount comparing means (833B) compares the pressure detected by the pressure detecting means (812) with a predetermined upper limit specified pressure. The auxiliary combustion agent introduction start means (833D) is provided by the accumulated amount comparison means (833B) and the pressure detection means (812).
If it is determined that the pressure detected in step (b) exceeds the specified pressure, the control of the combustion assisting means (82) starts the introduction of the combustion assisting agent, and based on the pressure immediately after combustion of the collected particulates. An exhaust gas purification device (2) for an internal combustion engine (1), further comprising a specified pressure updating means (833A) for updating the specified pressure to a new upper specified pressure. 8. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to claim 2, wherein a temperature of the particulate filter (811) or a temperature of the exhaust gas is detected. Temperature detecting means (81
3) and a temperature comparing means (833) for comparing the temperature detected by the temperature detecting means (813) with a preset specified temperature.
C), and the auxiliary agent charging start means (833D) is provided when the temperature comparison means (833C) determines that the temperature detected by the temperature detection means (813) exceeds the specified temperature. An exhaust gas purifying apparatus (2) for an internal combustion engine (1), characterized in that the auxiliary means is started by controlling the auxiliary means (82). 9. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to claim 2, wherein a temperature of the particulate filter (811) or a temperature of the exhaust gas is detected. Temperature detecting means (81
3) and a temperature comparing means (833) for comparing the temperature detected by the temperature detecting means (813) with a preset specified temperature.
C), and when it is determined by the temperature comparing means (833C) that the temperature detected by the temperature detecting means (813) has fallen below the specified temperature, the auxiliary fuel injection means (82) is controlled to assist. An exhaust gas purifying apparatus (2) for an internal combustion engine (1), comprising: a temperature-controllable auxiliary combustion agent introduction stop means (833F) for stopping the introduction of a fuel. 10. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to claim 2, wherein a pressure of the exhaust gas in front of the particulate filter (811) is detected. Pressure detecting means (812), and pressure comparing means (8) for comparing the pressure detected by the pressure detecting means (812) with a predetermined lower limit specified pressure.
33B), and when it is determined by the pressure comparing means (833B) that the pressure detected by the pressure detecting means (812) has fallen below a predetermined lower limit specified pressure, the auxiliary fuel injection means (82) And a pressure-management-type auxiliary-fuel-supply-supply stopping means for controlling the supply of the auxiliary agent by controlling the exhaust gas purifier. 11. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to any one of claims 2 to 10, wherein an elapsed time after the start of the addition of the auxiliary agent and a predetermined time set in advance. A time comparing means (833E) for comparing the fuel injection means with each other, and when the time comparing means (833E) determines that the elapsed time after the start of the charging has reached a predetermined time set in advance, ) Is controlled to stop the introduction of the auxiliary agent.
33G) internal combustion engine (1)
Exhaust gas purification device (2). 12. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to claim 1, wherein the particulate filter includes an oxidation catalyst (811).
(1) An internal combustion engine carrying D)
Exhaust gas purifying device (2). 13. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to any one of claims 1 to 12, wherein the auxiliary agent charging means (82) is provided in the intake passage (21).
An exhaust gas purifying apparatus (2) for an internal combustion engine (1), characterized in that a ventilator (23) provided in the vehicle can be charged with a combustion aid. 14. The exhaust gas purifying apparatus (2) for an internal combustion engine (1) according to any one of claims 1 to 13, wherein the auxiliary agent includes a base metal oxide. An exhaust gas purifying device (2) for an internal combustion engine (1), characterized in that: