JPH08326524A - Particulate purifying device for diesel engine - Google Patents

Abstract

PURPOSE: To prevent excessive combustion in the regenerating treatment of a particulate collecting filter. CONSTITUTION: A microcomputer 1 controls an air pump 7 for sucking air 6 and a valve 8 for regulating a flow rate so as to control the heating state of an AC heater 9 and an EHC heater 4 at the time of regenerating a filer 3 for collecting particulates in the exhaust gas of a diesel engine. A runaway detecting means 11 drives so as to fix load, controlled by the microcomputer 1, onto the safe side upon detecting a runaway state and displays by an alarm lamp 12. The microcomputer 1 monitors the overheat of the AC heater 9 and EHC heater 4 by a thermocouple 13, 14 during normal action and stops current application when the temperature rises excessively, and also monitors the air quantity, supplied by the air pump 7 and the valve 8, by a flow sensor 15 and drives in the cut-off direction when the air supply quantity becomes excessive so as to prevent excessive combustion in the filter 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for purifying particulates called particulates discharged from diesel engines mounted on various automobiles and forklifts, and more particularly to a fail-safe function thereof.

[0002]

2. Description of the Related Art Diesel engine exhaust gas contains particulates called "soot" which are called particulates, and it is necessary to collect and remove particulates with a filter in order to purify the exhaust gas. . When the particulates are collected, the filter is clogged and the particulate collection ability is reduced, so it is necessary to burn the particulates to regenerate the filter. The prior art of such a particulate purification device for a diesel engine is disclosed in, for example, Japanese Patent Laid-Open No. 5-3120.
21 and Japanese Patent Laid-Open No. 6-241024.
At the time of regeneration of the particulate collection filter, it is heated by a heater while supplying air to burn the particulates collected by the filter. In order to operate the particulate collection system efficiently, it is necessary to control the normal particulate collection operation and the regeneration operation of the filter that collects the particulates at appropriate timings. For this reason, a microcomputer that operates according to a preset program is used to control the particulate purification device, and an appropriate timing is determined according to various conditions to determine whether the filter is in a normal use state or a regeneration state. Switching is in progress.

[0003]

In a particulate purification device for a diesel engine, it is necessary to heat the filter in order to regenerate the filter. Therefore, when the control microcomputer runs out of control, the filter is overheated and the temperature of the filter becomes high. May cause fire hazard (FH) damage. Although the filter is made of ceramic and has good heat resistance, if it is overheated until a fire hazard occurs, it may be damaged and may not be regenerated. A prior art that monitors the operation of a microcomputer by a watchdog timer and shuts off the power source when it is determined that the microcomputer runs out of control is disclosed in Japanese Patent Application Laid-Open No. 3-204344, for example, regarding a vehicle constant speed traveling device. Further, prior art relating to failure diagnosis of an exhaust gas purifying apparatus for an internal combustion engine using a heater is disclosed in, for example, Japanese Patent Laid-Open No. 5-202735. However, these prior arts do not disclose how to deal with failsafe in a particulate purification device of a diesel engine or the like when a microcomputer runs out of control.

An object of the present invention is to provide a particulate purification device for a diesel engine which can realize an efficient fail-safe function with a simple structure.

[0005]

According to the present invention, particulates contained in exhaust gas from a diesel engine are collected by a filter, and the collected particulates are burned by supplying electricity to a heater while supplying air. In a particulate purification device for a diesel engine that regenerates a filter, an electronic control unit that controls the particulate purification process according to a preset program, and a runaway that detects the runaway state by monitoring the operating state of the electronic control unit In response to the output of the detection means and the runaway detection means,
A particulate purification device for a diesel engine, comprising: load fixing means for driving a load controlled by the electronic control means so as to be fixed to a safe side when the electronic control means runs out of control. Further, the load fixing means of the present invention drives the load so as to stop the energization of the particulate combustion heater or stop the supply of the particulate combustion air when the electronic control means runs out of control. And Further, the runaway detecting means of the present invention is characterized in that an alarm is issued when the electronic control means detects a runaway. Further, the present invention further includes a temperature detecting means for detecting the temperature of the particulate combustion heater, and a main relay interposed in a power supply line to the particulate combustion heater, wherein the electronic control means operates from the temperature detecting means. When the temperature of the particulate combustion heater rises excessively in response to the output of, the main relay is cut off. Further, the present invention further comprises a flow rate detecting means for detecting a flow rate of the particulate combustion air, and a main relay interposed in an electric power supply line to a supply system of the particulate combustion air, wherein the electronic control means is a flow rate. In response to the output from the detection means, when the supply of the particulate combustion air becomes excessive, the main relay is cut off. Further, the present invention further includes a temperature detecting means for detecting the temperature of the particulate combustion heater, and a normally closed type relay interposed in a power supply line to the particulate combustion heater, wherein the electronic control means is a temperature controller. In response to the output from the detection means, when the temperature of the particulate combustion heater rises excessively, the normally closed relay is cut off. Further, the present invention further includes temperature detection means for detecting the temperature of the particulate combustion heater, wherein the electronic control means responds to the output from the temperature detection means, and when the temperature of the particulate combustion heater rises excessively. The supply of air for particulate combustion is stopped. The present invention also provides
The electronic control means further includes a collection amount display means for displaying the collection amount of particulates by the filter, wherein the electronic control means monitors the operating state of the load to be controlled, and when it is determined that the operation of the load is a failure. The collection amount display means displays in a predetermined manner corresponding to the load and the alarm is issued.

[0006]

According to the present invention, the particulates contained in the exhaust gas from the diesel engine are collected by the filter, and the collected particulates are burned by energizing the heater while supplying air. The particulate purification process for regeneration is controlled by electronic control means that operates according to a preset program. The runaway detecting means monitors the operating state of the electronic control means and detects the runaway state. When the electronic control means goes out of control,
The load fixing means drives the load controlled by the electronic control means so as to fix the load on the safe side. As a result, it is possible to prevent the elements used in the particulate purification process from overheating and achieve a fail safe.

Further, according to the present invention, the load fixing means stops the energization of the particulate combustion heater or the supply of the particulate combustion air when the electronic control means runs out of control. Since it is driven, the combustion temperature for regeneration of the filter does not rise excessively, and it is possible to prevent the filter from burning.

According to the invention, the runaway detecting means issues an alarm when the electronic control means detects the runaway. Combustion of the particulates collected by the filter is often performed as unmanned operation when a vehicle equipped with a diesel engine is not in operation and stopped, but an alarm is issued to notify the user of the runaway condition. Can be informed.

According to the invention, the temperature of the particulate combustion heater is detected by the temperature detecting means, and the electronic control means sends the temperature to the particulate combustion heater when the temperature of the particulate combustion heater rises excessively. Shut off the main relay that is connected to the power supply line. Even if the control circuit of the particulate combustion heater fails and the particulate combustion heater remains energized, the main relay is turned off to stop the energization state and prevent the particulate combustion heater from overheating. Can be prevented.

According to the present invention, the flow rate detecting means detects the flow rate of the particulate combustion air, and when the electronic control means supplies the particulate combustion air excessively, the particulate combustion air supply system is provided. Shut off the main relay that is interposed in the power supply line to the. If the control circuit of the particulate combustion air supply system fails, the flow rate of the supply air becomes excessive and the combustion temperature rises excessively, which may cause fire hazard due to overcombustion, but by shutting off the main relay It is possible to prevent excessive temperature rise.

According to the invention, in response to the output from the temperature detecting means for detecting the temperature of the particulate combustion heater, the electronic control means intervenes in the power supply line of the particulate combustion heater. Shut off the relay. Normally closed relays
It is closed when de-energized, and normal temperature control is possible. When an excessive temperature rise is detected, the power supply to the particulate combustion heater is cut off by energization.
It is possible to prevent an excessive temperature rise.

Further, according to the invention, when the temperature detecting means detects an excessive temperature rise of the particulate combustion heater, the electronic control means stops the supply of the particulate combustion air. Even if the control system of the particulate combustion heater fails, if the supply of the particulate combustion air is stopped, abnormal overcombustion in the filter is eliminated, and the possibility of fire hazard can be considerably reduced.

Further, according to the present invention, the electronic control means is judged to have a failure in the operating state of the load to be controlled by using the collection amount display means for displaying the collection amount of the particulates by the filter. At this time, the collection amount display means displays in a predetermined manner corresponding to the load. Furthermore, since an alarm is also displayed, the load causing the failure can be specified only by referring to the alarm and the display means, and the accident diagnosis is performed again using the self-diagnosis function to specify the load. There is no need to take immediate action.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic structure of an embodiment of the present invention. The microcomputer 1 collects particulates contained in the exhaust gas of the diesel engine 2 by the filter 3 according to a preset program, and discharges them into the air as the exhaust gas 5 via the EHC heater 4. Control the purifier. The filter 3 collects particulates in the exhaust gas, and if the particulate collection amount increases, the filter 3 becomes clogged. Therefore, when the diesel engine 2 is not operating, the air 6 is supplied to the air pump 7.
Is sucked in, the flow rate is adjusted by the valve 8 to flow through the filter 3, and the particulates heated by the AC heater 9 are burned. by this,
The particulates trapped by the filter 3 can be removed and the filter 3 can be regenerated. The EHC heater 4 is
It is provided for burning and removing sulfur contained in the exhaust gas when burning particulates in the filter 3.

The microcomputer 1 which is the electronic control means visually displays the degree of clogging of the filter 3 by the collection display lamp 10 which is the collection amount display means. In the collection display lamp 10, for example, a plurality of lamps 10a, 10b, ..., 10j are arranged in a bar graph shape,
The number of lamps 10a, 10b, ..., 10j that light up when the amount of collected particulates is 0 is also 0, and the lamps 10a, 10b, ..., 1 that light up as the amount of collected particles increases.
As the number of 0j increases, all the lamps 10a, 10b,
.., 10j is lit, it indicates that the collection amount of the filter 3 has reached the maximum.

The operating state of the microcomputer 1 is monitored by the runaway detecting means 11. Runaway detection means 11
When detecting the runaway of the microcomputer 1, the alarm lamp 12 is turned on to display to the external user that the microcomputer 1 is in the runaway state. Further, the microcomputer 1 includes an EHC heater 4, an AC
Although the load of the heater 9, the valve 8 and the air pump 7 is controlled, when the microcomputer 1 runs out of control, each load is forcibly fixed to the safe side by the runaway detecting means 11.

In the range where the microcomputer 1 is operating normally, the temperature of the AC heater 9 is monitored by the thermocouple 13, the temperature of the EHC heater 4 is monitored by the thermocouple 14, and the air pump 7 and the valve 8 are used. The flow rate sensor 15 monitors the supply system of the particulate combustion air. When it is determined that the operation of each of these loads is abnormal, the microcomputer 1
Turns on the alarm lamp 12 and lights 10a, 1 of the collection display lamp 10 according to the load judged to be abnormal.
0b, ..., 10j are displayed in a predetermined manner, and the fact that the load has failed and which load has failed are externally displayed. In such a case, generally, it is necessary to use the diagnosis function provided in the microcomputer 1 to perform the operation of identifying the load having a failure, but according to the present embodiment, the collection display lamp 10 is viewed. It is possible to quickly determine which load is out of order. The runaway detecting means 11 is interposed between the control output 16 of the microcomputer 1 and each load, and monitors the monitoring output 17 of the microcomputer 1 while the load for fail-safe when the microcomputer 1 runs out of control. Acts as a fixing means.

FIG. 2 shows the electrical construction of the runaway detecting means 11 of FIG. A load 20 such as a relay for controlling the EHC heater 4, the air pump 7, the valve 8 and the AC heater 9 shown in FIG. 1 is switching-controlled by an NPN transistor 21 as a switching element. The base of the transistor 21 is connected to the control output 16 of the microcomputer 1 via the resistor 22. Control output 1
6 is assigned to the output port A of the microcomputer 1, for example. The output port B of the microcomputer 1 is assigned to the monitoring output 17, which repeats logical values 1 and 0 according to the program operation of the microcomputer 1 to output a rectangular wave waveform. This output waveform is input to the voltage doubler rectifier circuit including the diode 24 and the diode 25 via the capacitor 23. The output of the voltage doubler rectifier circuit is smoothed by the capacitor 26. A discharging resistor 27 is connected in parallel to the capacitor 26 and is connected to a non-inverting input of an operational amplifier 28.
A reference voltage source 29 is connected to the inverting input of the operational amplifier 28. The output of the operational amplifier 28 is connected to the cathode side of the diode 30. The anode side of the diode 30 is connected to the base of the transistor 21.

When the microcomputer 1 is operating normally, the voltage obtained by rectifying the rectangular wave output from the output port B by the diodes 24 and 25 is higher than the voltage of the reference voltage source 29, and the operational amplifier is used. 28 derives a high level output. Therefore, the diode 30 is in a reverse bias state, the output of the operational amplifier 28 and the base of the transistor 21 are electrically cut off, and the transistor 21 is driven only by the control signal from the output port A. When the microcomputer 1 goes out of control and the rectangular waveform is no longer output from the output port B, the input voltage on the non-inverting input side of the operational amplifier 28 becomes lower than the voltage of the reference voltage source 29 and the output of the operational amplifier 28. Becomes low level. Therefore, the diode 30 is in the forward direction, the base voltage of the transistor 21 is fixed to a low voltage, and the transistor 21 is disconnected from the control signal of the output port A.
The load 20 is fixed in the cutoff state.

As the load 20, the AC heater 9 and the EHC heater 4 consume a large amount of current and are driven by an AC power source in a stopped state. Therefore, in order to control the energized state, a solid state relay (hereinafter referred to as "SSR") is used. Abbreviated) is controlled. Air pump 7 and valve 8 are AC heater 9 and EH
Since the current consumption is smaller than that of the C heater 4, it is directly driven by connecting to + B of the DC power source. That is, when the microcomputer 1 runs out of control, the runaway detection means 11 causes the SSR of the AC heater 9 and the EHC heater 4 to run.
At least one of the SSR, the air pump 7 and the valve 8 is fixed to the shutoff side. By fixing the output of each load in this manner, fire hazard can be prevented even when the microcomputer 1 runs out of control.

FIG. 3 shows the configuration of another embodiment of the present invention. In the present embodiment, parts corresponding to those of the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, an electronic control unit (hereinafter abbreviated as "ECU")
The microcomputer 31 includes the microcomputer 1, output transistors 32 and 33, and the like. Each load 20 similar to that in FIG. 2 is connected to the battery (BATT) of the power source via the main relay 34. The exciting coil 35 of the main relay 34 is connected between the collector of the PNP transistor 32 in the ECU 31 and the ground, and makes the relay switch 36 conductive in the excited state and cut off in the non-excited state. PN
The base of the P-transistor 32 is connected to the cutoff output 37 of the microcomputer 1. Each load 20 is an ECU
The collector of the NPN transistor 32 in 31 is connected to the battery via the contact of the relay switch 36 of the main relay 34. Each load 20 is usually switching-controlled by a transistor 32, and a main relay 34
The relay switch 36 is normally kept in the ON state.
When the microcomputer 1 detects an excessive temperature rise of the heater or an abnormal increase of the air supply amount by the output from the thermocouples 13 and 14 or the flow rate sensor 15 in FIG. 1, the microcomputer 1 outputs the cutoff output 37. The main relay 34 by shutting off the transistor 32
The relay switch 36 is turned off. As a result, the power supply to each load 20 can be cut off and the fail-safe function can be achieved.

As described above, although AC power is supplied to the AC heater 9 and the EHC heater 4 via the SSR, these SSRs remain in the conductive state.
At the time of N failure, the main relay 34 can be cut off to cut off the power supply of the SSR and prevent fire hazard due to the high temperature of the AC heater 9 and the EHC heater 4. When it is determined by the flow sensor 15 that the air pump 7 and the valve 8 are in the ON failure, the main relay 34 is shut off, the power of the air pump 7 and the valve 8 is cut off, and the fire hazard caused by energization of the air pump 7 Prevent. According to the present embodiment, when each load fails, the fail-safe function can be achieved by cutting off the power supply that supplies power to the load side.

FIG. 4 shows the electrical construction of still another embodiment of the present invention. In the present embodiment, when a vehicle equipped with a diesel engine is not in operation, it is connected to the AC power source 40 at a predetermined location, and the filter regeneration process is performed with the AC heater 9 or the EHC heater 4 still attached. These heaters 4,
The power supply line 9 has a normally open SSR41
The relay switches 43 and 44 of the normally closed SSR 42 are interposed in series. Exciting coils 45 and 46 of the normally open SSR 41 and the normally closed SSR 42 are transistors 47 and 4, respectively.
Switching control is performed by 8. The normally open SSR 41 is controlled by the microcomputer 1 to perform a normal operation. Microcomputer 1
Are output from the thermocouples 13 and 14 to the heaters 4 and 9.
When an excessive temperature rise of, for example, a temperature of 800 ° C. or higher is detected, it is determined that the heaters 4 and 9 have failed, and the normally closed SSR 42 is energized to cut off the AC power source 40 applied to the heaters 4 and 9. . Normally open SSR
If only 41 is provided, if this normally open SSR 41 fails, the heaters 4 and 9 are always energized to prevent overheating. By adding the normally closed SSR 42, it is possible to stop the power supply to the heaters 4 and 9 even if the normally open SSR 41 fails, and the fail safe function is achieved.

As still another embodiment of the present invention, the AC heater 9 and the EHC can be used without using the main relay 34 and the normally closed SSR 42 shown in FIGS. 3 and 4.
When it is determined that the heater 4 or the like is in an abnormal energized state,
It is also possible to shut off the air pump 7 or the valve 8 to stop the supply of combustion air to prevent abnormal overcombustion. That is, when a failure occurs while the SSR of the AC heater 9 remains in the ON state, if the air pump 7 is de-energized, abnormal combustion in the filter can be suppressed. Also, by closing the valve 8, abnormal combustion in the filter can be suppressed. Similarly, when the ESR of the EHC heater 4 fails while the SSR is still ON, the air pump 7 or the valve 8 can be de-energized or closed to prevent abnormal combustion in the filter.

FIG. 5 shows the operation of the microcomputer 1 having the configuration shown in FIG. 1 as still another embodiment of the present invention. In this embodiment, the microcomputer 1 uses the collection display lamp 10 for the load determined to be abnormal to display. The collection display lamp 10 is provided with lamps 10a to 10j that perform bar graph lighting according to the amount of particulates collected by the filter 3. Normally, a bar graph is displayed in which the number of lamps that are turned on increases from the lamp 10a, such as the lamps 10b, 10c, ..., Depending on the amount of traps, the load confirmation operation from step a1 is repeated at a constant cycle. When it is determined that the AC heater 9 is abnormal in step a2, the tenth lamp 10j of the collection display lamp 10 is turned on in step a3. When it is determined in step a2 that the AC heater 9 is not abnormal,
Alternatively, when the display of the lamp 10j in step a3 is completed, it is determined in step a4 whether the EHC heater 4 is abnormal. If it is determined to be abnormal, the ninth lamp 10i is turned on in step a5. Step a4
When it is determined that the EHC heater 4 is not abnormal or when the lamp 10i is turned on in step a5, it is determined whether the air pump 7 is abnormal in step a6. If it is determined to be abnormal, the eighth lamp 10h is turned on in step a7. When it is determined in step a6 that the air pump 7 is not abnormal, or when step a7 ends, it is determined in step a8 whether the valve 8 is abnormal. If it is determined to be abnormal, step a
At 9, the seventh lamp 10g is turned on. When it is determined in step a8 that the valve is not abnormal, or when step a9 ends, the load confirmation operation ends in step a10.

Abnormalities in the AC heater 9 and the EHC heater 4 are thermocouples 1 for detecting whether or not the temperature rises excessively.
3,14. The abnormality of the air pump 7 and the valve 8 is determined by the flow rate of the flow rate sensor 15. According to the present embodiment, the upper lamps 10j to 10g, which normally have few opportunities to be lit, are lit, so that it is easy to understand that a failure has occurred. Furthermore, even if failures occur at a plurality of points, the failure points correspond to the specific lamps 10j to 10g, so that the failure points can be easily identified. Furthermore, if any of the malfunctions is detected, the alarm lamp 12 is also turned on so that it is easy to understand that the malfunction has occurred, for example, from a distance.

Although the AC power source 40 heats the AC heater 9 and the EHC heater 4 in the embodiment described above, it can be mounted on a vehicle if a large-capacity storage battery is provided or a generator is driven by a prime mover. The power supply can be energized. However, in a forklift used in the premises of a warehouse or a factory, it is easier to supply electric power using the AC power supply 40 while the vehicle is stopped, rather than mounting a large capacity power supply.

[0028]

As described above, according to the present invention, particulates contained in the exhaust gas of a diesel engine are collected by a filter according to a preset program,
Even if the electronic control unit that controls the purification process that burns the collected particulates and regenerates the filter runs away in an emergency, the load fixing unit can drive the load so that it is fixed on the safe side. Failsafe can be achieved by avoiding situations such as fire hazards.

Further, according to the present invention, the energization of the particulate combustion heater is stopped or the supply of the particulate combustion air is stopped to prevent an excessive temperature rise of the particulate combustion heater, You can prevent fire hazard.

Further, according to the present invention, since the alarm is displayed when the electronic control unit is out of control, the electronic control unit is out of control for the user even when the filter is regenerated by unmanned operation. I can inform you.

Further, according to the present invention, when the temperature of the particulate combustion heater rises excessively, there is a possibility of failure of the heater control system, but there is a main intervening power supply line separate from the control system. By breaking the relay, the possibility of fire hazard can be prevented.

Further, according to the present invention, the flow rate of the particulate combustion air is detected, and when the supply amount of the combustion air becomes excessive, it is presumed that the supply system is out of order.
By shutting off the main relay that is inserted into the power supply line separately from the control of the power supply system, it is possible to reliably stop the air supply to prevent excessive temperature rise of the particulate combustion heater and prevent fire hazard. You can

Further, according to the present invention, when the excessive temperature rise of the particulate combustion heater is detected, the normally-closed type relay interposed in the power supply line to the particulate combustion heater is shut off, so that the reliability is ensured. It is possible to prevent the situation of fire hazard by stopping the temperature rise of the particulate combustion heater.

Further, according to the present invention, the temperature of the particulate combustion heater is detected, and when the temperature rises excessively, the supply of the particulate combustion air is stopped, so abnormal overcombustion in the filter is prevented. Can be prevented to reduce the possibility of fire hazard.

Further, according to the present invention, when the operation of the load is judged to be a failure by using the collection amount display means for displaying the collection amount of the particulates, it is determined in a predetermined manner corresponding to the load. Since it is displayed, the load can be easily identified and a quick countermeasure can be taken.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is an electric circuit diagram showing an electric configuration of a runaway detecting means 11 of the embodiment shown in FIG.

FIG. 3 is a block diagram showing a schematic electrical configuration of another embodiment of the present invention.

FIG. 4 is a block diagram showing an electrical configuration according to still another embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the configuration of FIG. 1 as still another embodiment of the present invention.

[Explanation of symbols]

 1 Microcomputer 2 Diesel engine 3 Filter 4 EHC heater 5 Exhaust gas 6 Air 7 Air pump 8 Valve 9 AC heater 10 Collection display lamp 10a-10j lamp 11 Runaway detection means 12 Alarm lamp 13, 14 Thermocouple 15 Flow rate sensor 16 For control Output 17 Monitoring output 20 Load 28 Operational amplifier 29 Reference voltage 31 ECU 34 Main relay 37 Breaking output 40 AC power supply 42 Normally closed SSR

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F02B 77/08 F02B 77/08 K

Claims (8)

[Claims] 1. A diesel engine in which particulates contained in exhaust gas from a diesel engine are collected by a filter, and the collected particulates are burned by supplying electricity to a heater while supplying electricity to a heater to regenerate the filter. In the particulate purification apparatus of, the electronic control means for controlling the particulate purification process according to a preset program, the runaway detection means for monitoring the operating state of the electronic control means and detecting the runaway state, and the runaway detection means A particulate matter purification device for a diesel engine, comprising: a load fixing unit that responds to an output and that drives a load controlled by the electronic control unit so as to be fixed to a safe side when the electronic control unit runs out of control. 2. The load fixing means drives the load to stop energization of the particulate combustion heater or to stop supply of particulate combustion air when the electronic control means runs out of control. Claim 1 characterized by
Particulate purification device for diesel engine described. 3. The runaway detecting means issues an alarm when the electronic control means detects a runaway.
Alternatively, the particulate purification device for a diesel engine according to the item 2. 4. A temperature detecting means for detecting the temperature of the particulate combustion heater, and a main relay interposed in a power supply line to the particulate combustion heater, wherein the electronic control means operates from the temperature detecting means. In response to the output of
The particulate purification device for a diesel engine according to any one of claims 1 to 3, wherein the main relay is shut off when the temperature of the particulate combustion heater rises excessively. 5. A flow rate detecting means for detecting a flow rate of the particulate combustion air, and a main relay interposed in a power supply line to a supply system of the particulate combustion air are further included, and the electronic control means is a flow rate. In response to the output from the detection means,
When the supply of particulate combustion air becomes excessive,
4. The main relay is cut off, wherein the main relay is cut off.
The particulate purification device for a diesel engine according to any one of 1. 6. A temperature detecting means for detecting the temperature of the particulate combustion heater, and a normally-closed type relay interposed in a power supply line to the particulate combustion heater, wherein the electronic control means has a temperature. In response to the output from the detection means,
The particulate purification device for a diesel engine according to any one of claims 1 to 3, wherein when the temperature of the particulate combustion heater rises excessively, the normally closed relay is shut off. 7. A temperature detecting means for detecting the temperature of the particulate combustion heater, wherein the electronic control means is responsive to an output from the temperature detecting means,
The particulate purification device for a diesel engine according to any one of claims 1 to 3, wherein when the temperature of the particulate combustion heater excessively rises, the supply of the particulate combustion air is stopped. 8. A collection amount display means for displaying a collection amount of particulates by a filter, wherein the electronic control means monitors an operating state of a load to be controlled, and the operation of the load is a failure. The particulate purification device for a diesel engine according to claim 3, wherein when the determination is made, the collected amount display means displays in a predetermined manner corresponding to the load and the alarm is issued.