JPH07139335A - Exhaust gas purification device - Google Patents

Abstract

PURPOSE:To detect any opening/closing trouble of an opening/closing valve for opening/closing a space between an intake means and an exhaust pipe with a simple structure. CONSTITUTION:An intake air flow rate is accurately controlled by feedback- controlling an air intake means 13 by detecting an intake air flow rate of the air intake means 13 at the time of regenerating a filter 2. Additionally, opening trouble of an opening/closing valve 16 is discriminated by a quantity of the intake air flow rate. A temperature in the vicinity of the filter is detected during a period until a particulates are ignited by utilizing a temperature sensor 6 for detecting exhaust gas temperature which is used for calculation of a particulate collective quantity, after electrification to the air intake means 13 at the initial time of regeneration.

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 collecting and regenerating particulate matter (particulates) contained in the exhaust gas of a diesel engine.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 4-325707 is provided in the vicinity of a filter in order to regenerate the filter by burning particulates collected by a filter arranged in an exhaust path of a diesel engine. It is disclosed that the heater is energized and the outside air is supplied to the upstream side of the filter by the air pump.

Further, in the publication, in order to prevent the particulates in the exhaust gas from leaking to the outside through the air pump or accumulating on the air pump and causing malfunction of the engine during operation of the engine, the publication discloses that the particulates on the downstream side of the air pump. It is proposed that an on-off valve be installed in the air supply line and that this on-off valve be opened only during regeneration.

[0004]

However, the on-off valve disclosed in the above publication is affected by heat of exhaust gas and particulates, and in particular, the particulates enter the sliding surface of the valve body, which makes opening and closing difficult. As a result of the experiment, it was found that On the other hand, during filter regeneration, the air pump and heater are energized based on a fixed control sequence.
If the on-off valve opens improperly, the heater, filter, or air pump may overheat, which may eventually lead to failure.If the on-off valve fails improperly, untreated exhaust gas may leak or particulates on the sliding surface of the air pump. There is a possibility that there will be adhesion of the toner.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide an exhaust gas purifying apparatus capable of issuing a warning of a defective opening / closing of an opening / closing valve without complicating the apparatus structure. is there. A second object of the present invention is to provide an exhaust gas purifying device that can prevent a failure due to a defective opening / closing of the on-off valve without complicating the device configuration.

[0006]

An exhaust gas purifying apparatus according to a first aspect of the present invention comprises a filter arranged in an exhaust passage of a diesel engine and a particulate collected by the filter by heating the filter. Electric heating means for burning and regenerating the filter, air supply means for supplying external air to the exhaust path on the upstream side of the filter through an air supply pipeline, and the air supply pipeline at the outlet side of the air supply means An on-off valve, a temperature detecting means arranged in the vicinity of the electric heating means, and a particulate matter for calculating a particulate collection amount of the filter based on an exhaust gas temperature detected by the temperature detecting means. A trap collection amount calculating means, a filter regeneration timing determining means for determining a filter regeneration timing based on the particulate trapping volume, and a flow rate detecting means for detecting a flow rate of the air supply means. An energization control unit that controls energization to the electric heating unit and the air supply unit in a predetermined order and that feedback-controls the air supply flow rate during the filter regeneration based on the air supply flow rate detected by the flow rate detection unit, After the power supply to the air supply means is energized, the on-off valve open failure determination for determining the open failure of the on-off valve based on the air supply flow rate of the air supply means detected during the period until the particulate is ignited Means, and regeneration interruption means for interrupting the power supply to the electric heating means and the air supply means at the time of the opening failure.

In the exhaust gas purifying apparatus of the second invention, the filter disposed in the exhaust path of the diesel engine and the particulate matter collected by the filter by heating the filter are burned to burn the filter. Electric heating means for regeneration, air supply means for supplying external air to the exhaust path on the upstream side of the filter through the air supply pipeline, and opening / closing provided in the air supply pipeline on the outlet side of the air supply means A valve, a temperature detecting means arranged in the vicinity of the electric heating means, and a particulate trapping amount calculation for calculating a particulate trapping amount of the filter based on an exhaust gas temperature detected by the temperature detecting means. Means, a filter regeneration timing determining means for determining a filter regeneration timing based on the particulate collection amount, and an energization for controlling energization of the electric heating means and the air supply means in a predetermined order. Control means and opening / closing for determining whether the opening / closing valve is open poorly based on the temperature detected by the temperature detecting means during the period until the particulates are ignited after the air supply means is energized. It is characterized in that it comprises a valve opening failure determination means and a regeneration interruption means for interrupting the electric power supply to the electric heating means and the air supply means when the opening failure occurs.

In the exhaust gas purifying apparatus of the third invention, the filter disposed in the exhaust passage of the diesel engine and the particulate matter collected by the filter due to the heating of the filter are burned to burn the filter. Electric heating means for regeneration, air supply means for supplying external air to the exhaust path on the upstream side of the filter through the air supply pipeline, and opening / closing provided in the air supply pipeline on the outlet side of the air supply means A valve, a temperature detecting means arranged in the vicinity of the electric heating means, and a particulate trapping amount calculation for calculating a particulate trapping amount of the filter based on an exhaust gas temperature detected by the temperature detecting means. Means, a filter regeneration timing determining means for determining a filter regeneration timing based on the particulate collection amount, a flow rate detecting means for detecting a flow rate of the air supply means, the electric heating means and Energization control means for controlling energization to the air supply means in a predetermined order, and feedback control of the air supply flow rate during the filter regeneration based on the air supply flow rate detected by the flow rate detection means; The present invention is characterized by including an on-off valve closing failure determination means for determining a closing failure of the on-off valve based on the flow rate detected by the flow rate detection means, and an alarm means for outputting an alarm when the closing failure is caused.

[0009]

In each of the inventions, the air supply means supplies air to the filter, and the electric heating means heats the filter to burn the particulates. The on-off valve opens and closes between the air supply means and the exhaust path on the upstream side of the filter. The particulate collection amount is calculated using the supply air flow rate and the exhaust gas temperature, the filter regeneration timing is determined based on the particulate collection amount, and the electric heating means and the air supply means are energized in a predetermined order. Filter regeneration, that is, particulate combustion is performed.

In the first and third aspects of the invention, particularly, the supply flow rate is precisely controlled by detecting the supply flow rate of the supply means and performing feedback control of the supply means during filter regeneration.
In this case, when the filter is regenerated, the combustion temperature becomes too high (for example, 1000 ° C. or higher), which causes the melting loss of the filter and the life of the seal member, or the combustion temperature becomes too low (for example, 600 ° C. or less). Good regeneration is possible without causing filter regeneration failure. That is, according to the test results, the most important parameter that determines the combustion temperature is the supply oxygen flow rate, that is, the supply air flow rate,
The variation is the main cause of the fluctuation of the combustion temperature. Therefore, in the first and third aspects of the invention, the above problem is solved by precisely controlling the air supply flow rate by detecting the air supply flow rate of the air supply means and performing feedback control of the air supply means during filter regeneration.

Further, in the first aspect of the present invention, the supply air flow rate detecting means is used to detect the supply air flow rate until the particulates in the initial stage of filter regeneration are ignited, and the on-off valve is detected depending on the detected supply air flow rate. To determine the open failure. That is, if the air supply flow rate is small, it is determined that the opening is defective, and the power supply to the electric heating means and the air supply means is cut off. Further, in the third aspect of the invention, the supply air flow rate detecting means is used to detect the flow rate of the air supply means passing through during the engine operation period, and whether the on-off valve is closed or not is determined depending on the detected flow rate. That is, if the supply air flow rate is large, it is determined that the closing is defective, and the power supply to the electric heating means and the supply means is cut off.

In the first and third aspects of the invention, it is possible to detect a failure of the air supply means. In the second aspect of the invention, the temperature sensor for detecting the exhaust gas temperature used for calculating the amount of collected particulates described above is used, and after the power supply means is energized at the initial stage of regeneration, the particulates are discharged. The temperature near the filter is detected during the period until ignition. Here, if the detected temperature exceeds the predetermined level, it is determined that the on-off valve is not properly opened, and the power supply to the electric heating means and the air supply means is cut off.

(Effects of the Invention) As described above, in each of the above inventions, the opening and closing valve open / close failure is detected using the sensor installed for filter regeneration. Particularly, in the first and second inventions, the heating means and Since the power supply to the air supply unit is cut off, it is possible to prevent the electric heating unit and the air supply unit from being damaged. Further, according to the third aspect of the invention, it is possible to prevent the defective air supply means and prevent the pollution of the external environment.

[0014]

【Example】

(Embodiment 1) An embodiment of the exhaust gas purifying apparatus of the present invention is shown in FIG. This exhaust gas purifying apparatus has a filter housing case 1 whose both ends are hermetically sealed, and an upstream pressure sensor 7 for detecting exhaust pressure and a temperature sensor 6 (in the present invention) from the upstream side to the downstream side in the filter housing case 1. The temperature detecting means), the heater (electric heating means in the present invention) 11, the filter 2, and the downstream pressure sensor 17 for detecting the filter downstream pressure are sequentially arranged. The exhaust pipe 3 of the diesel engine 20 is provided on the upstream end wall of the filter housing case 1,
From the middle of the exhaust pipe 3 to the air supply pipe (the air supply pipe line in the present invention) 1
0 is branched. The air supply pipe 10 is connected to the discharge port of the blower 13 for air supply through an on-off valve 16, and the suction port of the air supply pipe 10 is passed through a supply air flow rate detection sensor (supply air flow rate detection means in the present invention) 19. It is connected to the suction port of the blower 13.

On the other hand, the above-mentioned heater 11 and blower 13 are drive-controlled by the controller 8, and the signal of the rotation speed sensor 18 mounted on the diesel engine 20 is output to the controller 8. The controller 8 is equipped with a microcomputer (not shown) with a built-in A / D converter, processes various data, controls the heater 11 and the blower 13 to execute regeneration, and also activates an abnormality warning lamp 9 when an abnormality occurs. Lights up (an abnormal signal is output). Reference numeral 91 is a reproduction instruction lamp.

The filter 2 is a honeycomb ceramic filter (manufactured by Nippon Insulator kk, diameter 5.66 inches × length 6 inches), which is fired into a cylindrical shape using cordierite as a raw material. The filter 2 has a large number of vent holes penetrating both end faces thereof, one of the adjacent vent holes is plugged at the upstream end, and the other is plugged at the downstream end. The exhaust gas passes through the porous partition wall between the adjacent vent holes, and only the particulates are trapped in the vent holes. Both end faces of the filter 2 face the both end faces of the case 1 with a predetermined distance.

The heater 3 is made of an electrothermal resistor made of a nichrome wire and is arranged in proximity to the end face of the filter 2 which is on the upstream side during regeneration. The operation of this device will be described below. (Particulate collection operation) Diesel engine 20
The exhaust gas discharged from the exhaust gas is introduced into the case 1 through the exhaust pipe 3, particulates in the exhaust gas are collected by the filter 2, and the purified exhaust gas is discharged to the outside from the tail pipe 4.

(Filter Regenerating Operation) Next, the regenerating operation of the filter 2 will be described with reference to the flow charts of FIGS. First, a filter regeneration timing determination routine executed during engine operation will be described with reference to FIG.

After the valve closing confirmation subroutine described below is executed in step 300, the exhaust pressures P1 and P2 detected by the pressure sensors 7 and 17 and the engine speed n detected by the rotation speed sensor 18 are calculated in step 100. The particulate collection amount G is calculated based on the temperature sensor 6 that detects the exhaust gas temperature T. The calculation of the particulate collection amount G will be described in detail in the subroutine of FIG.

First, at step 1001, the exhaust pressure P
1, P2, rotation speed n, and exhaust gas temperature T are input. Next, in step 1002, in order to eliminate the influence of the rotational speed n and the exhaust gas temperature T on the pressure loss (differential pressure) ΔP = P1-P2 of the filter 2, the corrected differential pressure ΔPeqi is calculated by the following correction formula. Ask.

ΔPeqi = ΔP × (523 / T) × (2600 / n) The exhaust gas temperature T is an absolute temperature, and the unit of the rotation speed n is r.
pm. That is, the measured differential pressure ΔP is calculated by the above equation, and the corrected differential pressure ΔPeqi corresponding to the differential pressure when the absolute temperature T is 523 and the rotation speed n is 2600 is calculated. Therefore, in this embodiment, the differential pressure is the exhaust gas temperature T or the rotation speed n.
Is inversely proportional to the fluctuation of. This corrected differential pressure ΔPeqi is calculated every 50 msec.

Next, at step 1003, the corrected differential pressure Δ
The moving average of the 64 calculated values immediately before Peqi is calculated, and this is set as the average correction differential pressure ΔPeqm. Next, step 1
At 004, the collection amount G is searched from the table stored in the memory (not shown) built in the microcomputer-type controller 8 and storing the relationship between the average correction differential pressure ΔPeqm and the collection amount G.

In step 102, it is checked whether or not the searched particulate collection amount G exceeds a predetermined threshold value Gt. If it does not exceed, the process returns to step 100, and if it does, the process proceeds to step 103. Step 103
Then, the lamp 91 for displaying the filter regeneration time is turned on and the routine ends.

After that, when the driver visually recognizes that the lamp 91 is lit and turns on the regeneration switch (not shown) while the engine is stopped, the filter regeneration execution routine shown in FIG. 3 is started. In this routine, first, in step 104, the blower 13 is started, and the built-in timer is started (10
6) In step 400, a valve opening confirmation subroutine, which will be described later, is executed, and then a timer control subroutine is executed to perform a regeneration operation (108).

The timer control subroutine will be described below with reference to FIG. This subroutine controls energization and air blowing based on a timer, and thereafter executes control operations in the order of the first term cooling mode, preheating mode, ignition mode, combustion propagation mode, and second term cooling mode. (First term cooling mode) First, in step 1161, the blower 13 is energized to set the air supply flow rate to a large value of 190 liters / minute, and air is blown for one minute to cool the filter 2 and the heater 11 to room temperature. This is because if the initial temperature of the filter 2 and the heater 11 varies due to heating by engine exhaust gas, the ignition timing and maximum temperature also vary. (Preheat mode) In the next step 1162, the heater 11
0.8 kW of electric power is supplied to the blower 13 and the air supply flow rate of the blower 13 is kept at 190 liters / minute, which continues for 10 minutes (1
163). By the blowing of the large air supply flow rate, each part of the filter 2 is uniformly preheated. (Ignition mode) In the next step 1164, the heater 11
Power supply to the blower 13
The supply air flow rate of is reduced to 20 liters / minute, and is continued for 3 minutes (1165). Due to the increase of the heating power and the decrease of the supply air flow rate, the temperature of the particulates on the front end face of the filter 2 suddenly rises and the ignition occurs. (Combustion Propagation Mode) In the next step 1166, the power supply to the heater 11 is slightly reduced to 1.2 kW, and the supply flow rate of the blower 13 is kept at 20 liters / minute.
Continue for 2 minutes (1167). This allows the filter 2
Combustion progresses downstream from the front end face of the.

However, in this embodiment, since the flow rate of the supply air is small, the amount of heat generated by the particulate combustion is not so large, and because the so-called wind pressure is weak, it is difficult to spread the fire in the direction of the air flow. As the heat balance leans toward the heat dissipation side, the temperature decreases as it goes to the downstream side of 2.
On the downstream side of the central portion of the filter 2 in the radial direction, the combustion temperature becomes lower than about 600 ° C. and the combustion is stopped.

By stopping this combustion, it is possible to prevent the radial center portion of the filter 2 from being burned to the downstream end face as in the conventional case, the air resistance is reduced, and the supply air flow rate does not pass through the radial center portion. Therefore, the middle-flow portion of the radial middle portion of the filter 2 is sufficiently burned until just before the downstream portion due to the supply of oxygen, and the upstream side of the outer peripheral portion of the filter 2 is also burned until just before the middle-flow portion for the same reason.

That is, according to this combustion propagation mode,
The downstream side of the radial center portion of the filter 2 burns up to the downstream end surface of the filter 2, the air resistance of the radial center portion of the filter 2 decreases, and the supply air flow rate passes through the radial central portion. It is possible to prevent the spread of flame from being delayed due to insufficient oxygen being supplied to the intermediate portion and the outer peripheral portion. (Late term cooling mode) In the next step 1168, the power supply to the heater 11 is stopped and the supply flow rate of the blower 13 is increased to 90 liters / minute for 10 minutes (1169).

When the supply air flow rate is greatly increased in this way,
Combustion is restarted on the downstream side of the radial center part due to the increase of the oxygen supply amount, especially the oxygen supply amount on the downstream side of the radial center part. Combustion is also accelerated, and regeneration is performed rapidly and uniformly in each part. Then, after the combustion of the particulates in each part is completed, the filter 2 is cooled by the large air supply flow rate, the blower 13 is turned off (1170), and the regeneration is completed.

Next, an interrupt routine for controlling the air flow rate of the blower 13 and checking the blower will be described with reference to FIG. This interrupt routine is executed at predetermined short time intervals (for example, several tens of msec). First, it is checked whether or not the blower operation command is output (200). If not, the process immediately returns to the main routine, and if it is output, the air flow rate sensor 19 detects the air flow rate (20).
2).

Next, the difference ΔF between the target flow rate stored at that time and the detected air flow rate is detected (204),
An energization duty ratio to a drive motor (not shown) with a built-in blower 13 corresponding to the difference ΔF is calculated (206), and the calculated energization duty ratio is applied to an energization control unit (built-in controller 8; not shown) for this drive motor. ) (20)
8). The energization control unit holds the energization duty ratio that is input, and also determines the energization duty ratio constant period 3
It comprises a gate control unit for outputting a phase pulse signal voltage and a MOS power transistor circuit which is opened / closed by the above-mentioned fixed-cycle three-phase pulse signal voltage. However, since its configuration and operation are well known, detailed description thereof will be omitted.

As a result, the blower 13 is feedback-controlled so that the difference ΔF becomes 0 and rotates at the accurate target rotation speed. Next, it is checked whether the current duty ratio is 100% (210), and if so, the process proceeds to step 212, and if not, the process returns to the main routine.

In step 212, it is checked from a built-in register (not shown) whether the previous energization duty ratio was 100%. If yes, the process proceeds to step 216, and if not, the built-in timer is started. (2
14) and proceeds to step 216. In step 216,
It is checked whether or not this timer has reached a predetermined set time (3 seconds in this case), and if it has not reached, it returns to the main routine, and if it has reached, the feedback control of the energization duty ratio is being performed. It is judged that the target air flow rate has not reached the target air flow rate even after the operation for 3 seconds at the energization duty ratio of 100%, the blower 13 is broken, the abnormality display lamp 9 is turned on, the timer is turned off, and the heater 1 is turned on.
The energization of 1 is stopped (218), and the routine ends.

Next, the above-mentioned valve closing confirmation subroutine 300 will be described with reference to FIG. First, the supply air flow rate Q is read based on the output signal of the supply air flow rate detection sensor (supply air flow rate detection means in the present invention) 19 (302), and whether the read supply air flow rate Q is larger than a predetermined flow rate Qt1. If it is below, it is determined that the on-off valve 16 is closed and the routine returns to the main routine. If it is larger, it is determined that the on-off valve 16 is not closed properly and the valve open signal is sent to the nonvolatile memory (EEPR).
OM), and this non-volatile memory (EEPROM) outputs an alarm signal for turning on the alarm lamp 9, whereby the alarm lamp 9 is turned on, and then the process returns to the main routine. It is of course possible to perform an operation such as prohibiting the engine start based on this alarm signal.

Next, the above-mentioned valve opening confirmation subroutine 400 will be described with reference to FIG. First, the supply air flow rate Q is read based on the output signal of the supply air flow rate detection sensor (supply air flow rate detection means in the present invention) 19 (402), and whether the read supply air flow rate Q is larger than a predetermined flow rate Qt2. If it is less than the above, it is determined that the on-off valve 16 is defectively opened, and a valve closing / opening signal is stored in the nonvolatile memory (EEPROM).
An alarm signal for lighting is output, whereby the alarm lamp 9 is turned on, and the routine ends. It is of course possible to perform an operation such as prohibiting the engine start based on this alarm signal.

On the other hand, the read supply air flow rate Q is the predetermined flow rate Q.
If t2 or more, it is determined that the opening / closing valve 16 is normally open without any trouble, and the process returns to the main routine. As described above, in this embodiment, the supply air flow rate detection sensor 19 used for controlling the flow rate of the blower 13 is used to detect and detect the supply air flow rate until the particulates in the initial stage of filter regeneration are ignited. Open / close valve 1 depending on the flow rate of supplied air
The open defect of 6 is determined. That is, if the supply air flow rate is small, it is determined that the opening is defective, and the power supply to the heater 11 and the blower 13 is cut off. Further, the on-off valve 16 is detected by detecting the flow rate through the air supply means during the engine operation period and depending on the detected flow rate.
Determine the closing failure of. That is, if the passing flow rate is large, it is determined that the valve is closed and an alarm is issued.

Therefore, the heater 11 and the blower 13 are de-energized due to defective opening / closing of the on-off valve 16, and the heater 11
Also, overheating of the blower 13 can be prevented. Also, obstacles due to particulate accumulation on the blower 13,
For example, it is possible to prevent rotation failure and increase in load torque at startup. Further, despite the addition of this function, it is possible to avoid complication of the device configuration, and since it is executed before the start of the timer control subroutine, there is no adverse effect on the regenerating operation or each part of the exhaust gas purification device. (Embodiment 2) Another embodiment of the valve opening confirmation subroutine will be described with reference to FIG.

In this embodiment, the opening failure of the on-off valve 16 is detected based on the temperature detected by the temperature sensor 6 when the filter is preheated. First, after preheating in step 1163, the temperature is detected from the temperature sensor 6 (502). If the on-off valve 16 is closed, the heater 11 does not cool or radiate heat by supplying air, so the temperature sensor 6 installed near the heater 11 detects much higher temperature than when the on-off valve 16 is open. .

Therefore, it is checked whether or not the detected temperature T is higher than a predetermined temperature Tt. If it is below, it is determined that the open / close valve 16 is open and the process returns to the main routine. The open signal is stored in a non-volatile memory (EEPROM), and the non-volatile memory (EEPROM) outputs an alarm signal for turning on the alarm lamp 9, whereby the alarm lamp 9 is turned on, and then the routine ends.

As described above, in this embodiment, the temperature sensor 6 used for calculating the trapped amount of the particulates is used to detect the temperature near the filter during the period until the particulates ignite in the initial stage of filter regeneration. Then, the opening failure of the on-off valve 16 is determined based on the detected temperature. That is, if the temperature is high, it is determined that the opening is defective, and the power supply to the heater 11 and the blower 13 is cut off.

Therefore, the heater 11 and the blower 13 are de-energized due to a defective opening of the on-off valve 16, and the heater 1
1 and the blower 13 can be prevented from overheating. Further, despite the addition of this function, it is possible to avoid complication of the device configuration, and since it is executed before the start of the timer control subroutine, there is no adverse effect on the regenerating operation or each part of the exhaust gas purification device.

Note that step 100 in FIG. 2 is a means for calculating the amount of collected particulates referred to in the present invention.
Reference numeral 02 is a filter regeneration timing determining means in the present invention,
Step 400 and the flowchart of FIG. 9 are the on-off valve opening failure determination means according to the present invention, and steps 406 and 50.
Reference numeral 6 is a reproduction interruption means in the present invention, and step 300
Is the on-off valve closing failure determination means in the present invention, and step 306 is an alarm means.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an exhaust gas purification device of the present invention,

FIG. 2 is a flowchart showing the reproducing operation,

FIG. 3 is a flowchart showing the reproducing operation,

FIG. 4 is a flowchart showing the reproduction operation,

FIG. 5 is a flowchart showing the reproducing operation,

FIG. 6 is a flowchart showing the reproducing operation,

FIG. 7 is a flowchart showing the reproducing operation,

FIG. 8 is a flowchart showing the reproducing operation,

FIG. 9 is a flowchart showing a reproducing operation of the second embodiment.

[Explanation of symbols]

2 is a filter, 6 is a temperature sensor (temperature detecting means), 7,
Reference numeral 17 is a pressure sensor (pressure detection means), 8 is a controller (particulate trap collection amount calculation means, filter regeneration timing determination means, energization control means, open / close valve open failure determination means, regeneration interrupt means, open / close valve closed failure determination means. ), 11 is a heater (electric heating means), 13 is a blower (air supply means), 18 is a rotation speed sensor (revolution speed detection means), and 9 is an alarm lamp (warning means).

Claims (3)

[Claims] 1. A filter arranged in an exhaust passage of a diesel engine, an electric heating means for regenerating the filter by burning particulates collected by the filter by heating the filter, and an air supply pipe. An air supply means for supplying external air to the exhaust path upstream of the filter through a passage, an opening / closing valve arranged in the air supply pipeline on the outlet side of the air supply means, and in the vicinity of the electric heating means Temperature detecting means disposed in the filter, particulate collection amount calculating means for calculating the particulate collection amount of the filter based on the exhaust gas temperature detected by the temperature detecting means, and the particulate collection. A filter regeneration timing determining means for determining a filter regeneration timing based on the collected amount, a flow rate detecting means for detecting a flow rate of the air supplying means, and a predetermined energization to the electric heating means and the air supplying means. An energization control unit that controls in sequence and feedback-controls the air supply flow rate during the filter regeneration based on the air supply flow rate detected by the flow rate detection unit; and, after the air supply unit is energized, the particulate -An open / close valve open failure determination means for determining an open failure of the open / close valve based on the air supply flow rate of the air supply means detected during the period until the ignition of the gate, and the electric heating means and the supply air when the open failure occurs. An exhaust gas purifying device comprising: a regeneration interrupting unit that interrupts energization to the air unit. 2. A filter arranged in an exhaust path of a diesel engine, an electric heating means for burning particulates collected by the filter by heating the filter to regenerate the filter, and an air supply pipe. An air supply means for supplying external air to the exhaust path upstream of the filter through a passage, an opening / closing valve arranged in the air supply pipeline on the outlet side of the air supply means, and in the vicinity of the electric heating means Temperature detecting means disposed in the filter, particulate collection amount calculating means for calculating the particulate collection amount of the filter based on the exhaust gas temperature detected by the temperature detecting means, and the particulate collection. A filter regeneration timing determining means for determining a filter regeneration timing based on the collected amount; an energization control means for controlling energization of the electric heating means and the air supplying means in a predetermined order; and the air supplying means. After the power is turned on, the open / close valve open failure determination means for determining the open failure of the open / close valve based on the temperature detected by the temperature detection means in the period until the particulate is ignited, and the open An exhaust gas purifying device, comprising: a regeneration interruption means for interrupting the electric power supply to the electric heating means and the air supply means in the event of a failure. 3. A filter arranged in an exhaust path of a diesel engine, an electric heating means for regenerating the filter by burning particulates collected by the filter by heating the filter, and an air supply pipe. An air supply means for supplying external air to the exhaust path upstream of the filter through a passage, an opening / closing valve arranged in the air supply pipeline on the outlet side of the air supply means, and in the vicinity of the electric heating means Temperature detecting means disposed in the filter, particulate collection amount calculating means for calculating the particulate collection amount of the filter based on the exhaust gas temperature detected by the temperature detecting means, and the particulate collection. A filter regeneration timing determining means for determining a filter regeneration timing based on the collected amount, a flow rate detecting means for detecting a flow rate of the air supplying means, and a predetermined energization to the electric heating means and the air supplying means. Based on the flow rate detected by the flow rate detection means during engine operation, the current control means for controlling the supply flow rate during the filter regeneration based on the supply air flow rate detected by the flow rate detection means. An exhaust gas purifying apparatus comprising: an on-off valve closing failure determination unit that determines whether the opening and closing valve is closed; and an alarm unit that outputs an alarm when the closing failure occurs.