JP6933609B2 - Diesel engine exhaust treatment system - Google Patents

Description

The present invention relates to an exhaust treatment device for a diesel engine, and more particularly to a device capable of delaying the start of DPF regeneration and continuing indoor work or the like in which the emission of high-temperature exhaust gas is avoided.

Conventionally, as an exhaust treatment device for a diesel engine, a DPF arranged in an exhaust path, a PM deposition amount estimation device for estimating the amount of PM accumulated on the DPF, and an electronic control device are provided, and the PM accumulation amount estimation value of the DPF is provided. Is configured so that the electronic control device regenerates the DPF after reaching a predetermined regeneration required value (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-116913 (see FIGS. 5 and 6)

In Patent Document 1, when the estimated PM accumulation amount of the DPF reaches a predetermined required regeneration value, the regeneration of the DPF is automatically started, so that the indoor work or the like in which the discharge of high-temperature exhaust gas is avoided is continued. Can't.

An object of the present invention is to provide an exhaust gas treatment device for a diesel engine capable of delaying the start of DPF regeneration and continuing indoor work or the like in which the emission of high-temperature exhaust gas is avoided.

The main invention-specific matters of the present invention are as follows.
Based on the estimated PM accumulation value of the DPF reaching the predetermined required regeneration value, the regeneration hold period setting device sets the initial regeneration hold period for the DPF regeneration, and the electronic control device initially sets the regeneration advisory alarm device. If the extension operation device does not perform the initial extension operation during the initial regeneration hold period, the DPF regeneration process is started after the initial regeneration hold period elapses, and the initial DPF regeneration is started. If the initial extension operation is performed by the extension operation device during the regeneration hold period of, the regeneration hold period is initially extended after the lapse of the initial playback hold period.
The initial extension of the playback hold period is made only for the specified extension period,
During the initial extension period, the electronic control device issues a regeneration advisory alarm for the initial extension period with the regeneration advisory alarm device, and if the extension operation device does not perform the re-extension operation during the initial extension period, after the initial extension period has elapsed. , If the DPF regeneration process is started without the determination based on the PM deposition estimated value of the DPF and the re-extension operation is performed by the extension operation device during the initial extension period, the regeneration suspension period of the DPF regeneration is initially set. A diesel engine exhaust treatment device characterized in that it is configured to be re-extended after the extension period has elapsed.

The present invention has the following effects.
During the initial regeneration hold period, the initial extension operation by the extension operation device (6) is made, playback wait period of DPF regeneration is initialized extended (S2), delays the start of DPF regeneration, the discharge of the hot exhaust is repellent Indoor work, etc. can be continued.
During the initial regeneration hold period, if the initial extension operation of the extension operation device is not performed, because the regeneration process of the DPF after the lapse of the initial reproducing hold period starts, that the PM is excessively deposited on the DPF It can be prevented.
It is possible to prevent excessive PM accumulation in the DPF (2) during the initial extension period.
The regeneration suspension extension period of the DPF regeneration can be re-extended, the start of the DPF regeneration can be further delayed, and indoor work or the like in which the discharge of high-temperature exhaust gas is avoided can be continued.

It is a schematic diagram of the engine which concerns on embodiment of this invention. It is a flowchart of the process of the electronic control device of the engine of FIG. In the time chart of the regeneration advisory warning, FIG. 3 (A) is a regeneration advisory warning during the initial regeneration suspension period , FIG. 3 (B) is a regeneration advisory warning during the initial extension period, and FIG. 3 (C) is a regeneration advisory during the re-extension period. Indicates an alarm.

1 to 3 are views for explaining an engine according to an embodiment of the present invention, and in this embodiment, a vertical water-cooled in-line 4-cylinder diesel engine provided with an exhaust treatment device will be described.

The outline of this engine is as follows.
As shown in FIG. 1, this engine includes a cylinder block (11), a cylinder head (12) assembled on the upper part of the cylinder block (11), and a fly wheel (11) provided on the rear part of the cylinder block (11). 13), an engine cooling fan (14) provided at the front of the cylinder block (11), an intake manifold (not shown) arranged on one side of the cylinder head (12), and a cylinder head (12). ), An exhaust manifold (16) arranged on the other side, a supercharger (17) connected to the exhaust manifold (16), and an exhaust treatment case provided on the downstream side of the exhaust of the supercharger (17). (18), a fuel supply device (19a), and an electronic control device (20) are provided.

The outline of the intake device is as follows.
As shown in FIG. 1, the intake device includes a compressor (17a) of a supercharger (17), an air cleaner (21) arranged on the intake upstream side of the compressor (17a), an air cleaner (21), and a compressor (17a). ), An intercooler (23) arranged on the intake downstream side of the compressor (17a), and an intake throttle valve (23) arranged on the intake downstream side of the intercooler (23). 24) and an intake manifold (not shown) arranged on the intake downstream side of the intake throttle valve (24) are provided.
The air flow sensor (22) and the electric actuator (24a) of the intake throttle valve (24) are electrically connected to the electronic control device (20).
An engine ECU is used in the electronic control device (20). ECU is an abbreviation for electronic control unit and is a microcomputer.

The outline of the fuel supply device (19a) is as follows.
As shown in FIG. 1, the fuel supply device (19a) is a common rail type, and has a plurality of fuel injectors (25) inserted into each cylinder and a common rail (25) for distributing the accumulated fuel to the plurality of fuel injectors (25). It includes a 26), a fuel supply pump (27) that pumps fuel to the common rail (26), and a fuel tank (28).
The fuel supply pump (27) and the solenoid valve (25a) of the fuel injector (25) are electrically connected to the electronic control device (20). An accelerator sensor (29), a crankshaft sensor (30), and a cylinder discrimination sensor (31) are electrically connected to the electronic control device (20). The accelerator sensor (29) detects the target rotation speed of the engine, and the crankshaft sensor (30) detects the actual rotation speed and crank angle of the engine. The cylinder discrimination sensor (31) detects the combustion stroke of each cylinder.

In the fuel supply device (19a), the engine load is calculated by the electronic control device (20) based on the deviation between the target rotation speed and the actual rotation speed of the engine, and the fuel injector is calculated according to the target rotation speed and the engine load of the engine. The electromagnetic valve (25a) of (25) is opened at a predetermined timing for a predetermined time, and a predetermined amount of fuel (32) is injected from the fuel injector (25) into each cylinder at a predetermined timing. The fuel (32) is light oil.

As shown in FIG. 1, the accelerator sensor (29) detects a target rotation speed setting position of the accelerator lever (29a), and a potentiometer is used for the accelerator sensor (29).

As shown in FIG. 1, the crankshaft sensor (30) detects the passage of the protrusion of the crankshaft detection disc (30a) attached to the flywheel (13). The crankshaft detection disc (30a) is provided with one starting point protrusion on the peripheral edge and a large number of phase protrusions provided at equal pitches, and the actual engine rotation is performed by the electronic control device (20) based on the passing speed of these protrusions. The number is calculated, and the crank angle is calculated based on the phase difference between the passing phase protrusion and the starting protrusion.
The cylinder discrimination sensor (31) detects the passage of the protrusion of the cylinder discrimination disc (31a) attached to the valve drive cam shaft (not shown). The cylinder discrimination disk (31a) is provided with one protrusion on the peripheral edge, and the electronic control device (20) discriminates the combustion stroke of four cycles based on the passage of the protrusion.
An electromagnetic pickup sensor is used for the crankshaft sensor (30) and the cylinder discrimination sensor (31).

The outline of the exhaust system is as follows.
As shown in FIG. 1, the exhaust device includes an exhaust manifold (16), an exhaust turbine (17b) of a supercharger (17) provided on the exhaust downstream side of the exhaust manifold (16), and an exhaust turbine (17b). It is provided with an exhaust treatment device (33) provided on the downstream side of the exhaust gas. A series of paths from the exhaust manifold (16) to the exhaust treatment device (33) is the exhaust path (1).

The outline of the exhaust treatment device (33) is as follows.
As shown in FIG. 1, the exhaust treatment device (33) includes an exhaust treatment case (18) provided on the exhaust downstream side of the exhaust turbine (17b) of the supercharger (17) and the inside of the exhaust treatment case (18). It has a DOC (35) arranged on the upstream side of the exhaust gas and a DPF (2) arranged on the downstream side of the exhaust gas in the exhaust treatment case (18).

DPF is an abbreviation for diesel particulate filter, which captures PM in engine exhaust. PM is an abbreviation for particulate matter. As shown in FIG. 1, a large number of cells (2a) along the axial length direction are arranged side by side in the DPF (2), and the inlets and outlets of the adjacent cells (2a) and (2a) are alternately sealed. A wall-flow type ceramic honeycomb is used.
DOC is an abbreviation for diesel oxidation catalyst, and oxidizes CO (carbon monoxide) and NO (nitric oxide) in engine exhaust. For the DOC (35), a flow-through type ceramic honeycomb in which a large number of cells (35a) along the axial length direction are arranged side by side in a penetrating manner is used, and the cells are oxidized with rhodium of platinum or palladium. The catalyst component is supported.

The exhaust gas treatment device (33) includes a regeneration device (R) of the DPF (2).
As shown in FIG. 1, the regeneration device (R) of the DPF (2) has a DPF (2) arranged in the exhaust path (1) and a PM deposition that estimates the amount of PM deposited in the DPF (2). The electronic control device (20) is provided with the quantity estimation device (4) and the electronic control device (20), and after the PM deposition estimated value of the DPF (2) reaches a predetermined regeneration required value, as shown in FIG. Is configured to perform the regeneration process (S6) of the DPF (2).
As shown in FIG. 1, in the regeneration process of the DPF (2), the exhaust gas (39) is heated by the exhaust gas heating device (19), and the PM deposited on the DPF (2) is incinerated. There is.

As shown in FIG. 1, the PM deposition amount estimation device (4) is composed of an electronic control device (20), and is a differential pressure sensor (3) that detects the differential pressure between the exhaust inlet side and the exhaust outlet side of the DPF2). Based on the detected differential pressure, the amount of PM deposited on the DPF (2) is estimated. Instead of the differential pressure of the DPF (2), the accumulated amount of PM accumulated on the DPF (2) may be estimated based on the integrated value of the engine operating time and the integrated value of the fuel supply amount.
The exhaust temperature raising device (19) includes an intake throttle valve (24), a fuel supply device (19a), an DOC (35), and an exhaust gas on the DOC inlet side that detects the exhaust temperature on the exhaust inlet side of the DOC (35). The temperature sensor (37), the exhaust temperature sensor (36) on the DPF outlet side that detects the exhaust temperature on the exhaust outlet side of the DPF (2), and the DPF inlet side that detects the exhaust temperature on the exhaust inlet side of the DPF (2). It is equipped with an exhaust temperature sensor (38).
Each of the above sensors (36), (37), and (38) is electrically connected to the electronic control device (20).

As shown in FIG. 1, in the exhaust treatment device (33), the DPF (2) captures the PM in the engine exhaust (39), and the NO (nitrogen monoxide) in the exhaust (39) is converted by the DOC (35). With NO2 (nitrogen dioxide) obtained by oxidation, PM deposited on the DPF (2) is continuously oxidatively combusted at a relatively low temperature, and the differential pressure detected by the differential pressure sensor (3) requires predetermined regeneration. Based on the value reached, the unburned fuel supplied to the exhaust (39) by the post-injection of the common rail type fuel supply device (19a) under the control of the electronic control device (20) is DOC (35). The exhaust (39) is heated by catalytic combustion, and the PM deposited on the DPF (2) is burned at a relatively high temperature to regenerate the DPF (2).
When the exhaust temperature is low and the exhaust temperature on the inlet side of the DOC (35) does not reach the activation temperature of the DOC (35), the intake throttle valve (24) is throttled by the control of the electronic control device (20). , The exhaust temperature is raised.

The start time of the DPF regeneration process is as follows.
When the differential pressure detected by the differential pressure sensor (3) reaches the required regeneration value, the exhaust temperature on the inlet side of the DOC (35) has reached the activation temperature of the DOC (35), and at that point, post-injection is performed. When is started, the start time of the post injection becomes the start time of the regeneration process of the DPF.
When the differential pressure detected by the differential pressure sensor (3) reaches the required regeneration value, the exhaust temperature on the inlet side of the DOC (35) has not reached the activation temperature of the DOC (35), and the intake throttle valve (3) When 24) is throttled, the throttle start time of the intake throttle valve (24) becomes the start time of the DPF regeneration process. In this case, the time when the inlet side exhaust temperature of the DOC (35) reaches the activation temperature of the DOC (35) and the post injection is started may be defined as the start time of the DPF regeneration process.

Instead of the post-injection of the common rail type fuel supply device (19a), an exhaust pipe fuel injector (not shown) arranged between the exhaust turbine (17b) and the DOC (35) of the supercharger (17) is used. Exhaust pipe injection that injects unburned fuel into the exhaust (39) may be used. Further, instead of the post injection of the common rail type fuel supply device (19a), the exhaust temperature may be raised by the heat generated by the electric heater or the exhaust throttle of the exhaust throttle valve.

The engine is equipped with a DPF (2) regeneration holding device.
As shown in FIG. 1, the regeneration holding device of the DPF (2) includes a regeneration holding period setting device (9), a regeneration advisory alarm device (8), a timing device (5), and an extension operation device (6). As shown in FIG. 2, the regeneration suspension period setting device (9) sets the regeneration suspension period based on the PM deposition estimated value of the DPF (2) reaching a predetermined regeneration required value. Along with setting the period (S2), the electronic control device (20) issues an initial regeneration advisory alarm (S3) with the regeneration advisory alarm device (8), and the extension operation device (6) is issued during the initial regeneration suspension period of the DPF regeneration. If the initial extension operation according to) is not performed, the regeneration process (S6) of the DPF (2) is started after the initial regeneration hold period of the DPF regeneration elapses, and the extension is performed during the initial regeneration hold period of the DPF regeneration. When the initial extension operation is performed by the operating device (6) , the regeneration holding period is initially extended (S2) after the lapse of the initial regeneration holding period of the DPF regeneration.

Therefore, if the extension operation is performed by the extension operation device (6) during the initial regeneration hold period of the DPF regeneration, the regeneration hold period of the DPF regeneration is initially extended (S2), the start of the DPF regeneration is delayed, and the high temperature exhaust is performed. It is possible to continue indoor work, etc., which avoids the discharge of.
Moreover, during the initial playback wait period of DPF regeneration, when the initial extension operation of the extension operation device (6) is not performed, the reproduction process of the DPF (2) after the lapse of the initial reproduction wait period of DPF regeneration (S6 ) Is started, so that it is possible to prevent PM from being excessively deposited on the DPF (2).

As shown in FIG. 1, the reproduction holding period setting device (5) is composed of an electronic control device (20).
The reproduction advisory alarm device (8) is composed of an alarm lamp electrically connected to the electronic control device (20), and the alarm is issued by lighting the alarm lamp. A light emitting diode is used for the alarm lamp.
As the reproduction advisory alarm device (8), a display such as a liquid crystal display or an organic EL display can be used instead of the alarm lamp, and the alarm may be issued by displaying characters, figures, and symbols. EL is an abbreviation for electroluminescence.
As the reproduction advisory alarm device (8), an alarm buzzer, an alarm sound generator such as an alarm bell, or the like can be used instead of the alarm lamp, and the alarm may be issued by the alarm sound.
The extension operation device (6) is composed of a push button type operation switch electrically connected to the electronic control device (20), and the push operation of the operation switch is the extension operation.

As shown in FIG. 1, this engine includes a period extension operation device (6), and as shown in FIG. 2, the initial extension (S2) of the reproduction suspension period is performed only for a predetermined extension period.
Therefore, it is possible to prevent excessive PM accumulation in the DPF (2) during the initial extension period.

During the initial extension period is reproduced recommendation alert initial extended-life (S3) emitted by the electronic control device (20) reproducing advisory warning device (8), re-extend operation by the extending operating device during an initial extension period (6) is made If not, after the lapse of the initial extension period, the regeneration process (S6) of the DPF (2) is started without going through the judgment based on the PM deposition estimated value of the DPF (2), and the DPF (2) is extended during the initial extension period. When the re- extension operation is performed by the operating device (6), the regeneration suspension period of the DPF regeneration is configured to be re-extended (S2) after the lapse of the initial extension period.
Therefore, the regeneration suspension extension period of the DPF regeneration can be re-extended, the start of the DPF regeneration can be further delayed, and the indoor work or the like in which the discharge of high-temperature exhaust gas is avoided can be continued.

As shown in FIG. 1, in this engine, the re-extension (S2) of the reproduction suspension period is performed only for a predetermined re-extension period.
Therefore, it is possible to prevent excessive PM accumulation in the DPF (2) during the re-extension period.

During the re-extension period, the electronic control device (20) issues a regeneration advisory alarm (S3) during the re-extension period with the regeneration advisory alarm device (8), and during the re-extension period, the extension operation device (6) performs a re-extension operation. If not, the regeneration process (S6) of the DPF (2) is started after the re-extension period elapses, and if the re-extension operation is performed by the extension operation device (6) during the re-extension period, the DPF The regeneration suspension period of reproduction is configured to be further re-extended (S2) after the lapse of the re-extension period.
Therefore, the holding period of the DPF regeneration can be extended again, the start of the DPF regeneration can be delayed, and the indoor work or the like in which the discharge of high-temperature exhaust gas is avoided can be continued.
During the extension period, the pushing operation of the operation switch of the extension operation device (6) becomes the extension operation of further re-extension (re-extension).

In this engine, as shown in FIG. 1, the regeneration advisory alarm device (8) is composed of warning lights, and as shown in FIGS. 3 (A) to 3 (C), the regeneration advisory alarm during the initial regeneration suspension period is , The continuous lighting display is displayed, and the regeneration advisory alarm in the initial extension period and the regeneration advisory alarm in the re-extension period are blinking displays having different cycles.
Therefore, a single advisory alarm device (8) can clearly distinguish three different types of advisory alarms.

In this engine, as shown in FIGS. 3B and 3C, the blinking cycle of the re-extension advisory alarm in the re-extension period is set shorter than the blinking cycle of the long-term regeneration advisory alarm in the initial extension period.
Therefore, it is possible to emphasize the urgency of the regeneration advisory warning during the re-extension period by the short blinking cycle.

As shown in FIG. 2, the procedure of the DPF regeneration and the reproduction hold processing by the electronic control device (20) will be described with a flowchart.
In step (S1), it is determined whether or not the estimated PM deposition value of DPF (2) has reached the required regeneration value. The determination is repeated until the determination is affirmed, and when the determination is affirmed, the process proceeds to step (S2).
In step (S2), an initial reproduction holding period is set, in step (S3), an initial reproduction recommendation alarm is started, and in step (S4), it is determined whether or not the initial reproduction holding period has elapsed, and a determination is made. If is affirmed, the initial regeneration advisory alarm is terminated in step (S5), and the process proceeds to step (S6).

In step (S6), the regeneration process of the DPF (2) is started, and the process proceeds to step (S7).
In the regeneration process of the DPF (2), when the exhaust temperature on the inlet side of the DOC (35) does not reach the activation temperature of the DOC (35), the intake throttle valve (24) is throttled and reaches the activation temperature. Then, the unburned fuel is supplied to the exhaust (39) by the post injection of the fuel supply device (19), the unburned fuel is catalytically burned by the DOC (35), the exhaust temperature rises, and the fuel is accumulated in the DPF (2). PM is incinerated and removed.
In step (S7), it is determined whether or not the reproduction end condition is satisfied, and if the determination is affirmed, the process proceeds to step (S8).
In step (S8), the regeneration process of the DPF (2) is completed, and the process returns to step (S1).

If the determination in step (S7) is denied, the process returns to step (S6) and the regeneration process of the DPF (2) is continued.
The regeneration end condition of step (S7) is that the integrated time at which the DPF inlet exhaust temperature maintains a predetermined regeneration required temperature (for example, around 500 ° C.) reaches a predetermined end set time (for example, 20 minutes) by post injection. Is.
If the exhaust temperature on the DPF outlet side reaches an abnormally high temperature (for example, around 700 ° C.) during the regeneration of the DPF, the post injection is stopped in order to avoid thermal damage to the DPF (2).

If the determination is denied in step (S4) and the determination that the period extension operation has been performed is affirmed in step (S9) during the initial regeneration hold period, the regeneration hold period is initially extended in step (S2). Then, in step (S3), the initial regeneration recommendation display is continued during the initial regeneration hold period, and when the regeneration hold period of the initial extension period is entered, the regeneration recommendation display of the initial extension period is implemented, and in step (S4). If the elapse of the regeneration suspension period of the initial extension period is affirmed, the regeneration recommendation display of the initial extension period is terminated in step (S5), and the determination based on the PM deposition estimated value of the DPF (2) is not performed. The regeneration process of the DPF (2) is started in the step (S6).

If the determination is denied in step (S4) and the determination that the period re-extension operation has been performed is affirmed in step (S9) during the regeneration suspension period of the initial extension period, the regeneration suspension period in step (S2). Is re-extended, and in step (S3), the regeneration recommendation display of the extension period is continued during the regeneration suspension period of the extension period, and when the regeneration suspension period of the re-extension period is entered, the regeneration recommendation display of the re-extension period is implemented. When the regeneration suspension period of the re-extension period has elapsed in step (S4), the regeneration recommendation display of the re-extension period is terminated in step (S5), and the regeneration process of DPF (2) is started in step (S6). ..

If the determination is denied in step (S4) and the determination that the period re-extension operation has been performed is affirmed in step (S9) during the regeneration suspension period of the re-extension period, the regeneration suspension period in step (S2). Is re-extended, the regeneration recommendation display of the re-extension period is continued in step (S3), and when the regeneration suspension period of the re-extension period elapses in step (S4), the regeneration of the re-extension period is regenerated in step (S5). The recommendation display is finished, and the regeneration process of the DPF (2) is started in step (S6).

(1) ... Exhaust path, (2) ... DPF, (4) ... PM deposition amount estimation device, (5) ... Timekeeping device, (6) ... Extension operation device, (8) ... Regeneration advisory alarm device, (9) ... Reproduction hold period setting device, (20) ... Electronic control device, (S3) ... Regeneration advisory alarm, (S6) ... DPF regeneration processing.

Claims (5)

A DPF (2) arranged in the exhaust path (1), a PM deposition amount estimation device (4) for estimating the amount of PM deposited on the DPF (2), and an electronic control device (20) are provided, and the DPF ( After the PM deposition estimated value of 2) reaches a predetermined regeneration required value, the electronic control device (20) is configured to perform the regeneration process (S6) of the DPF (2).
It is equipped with a playback hold period setting device (9), a playback advisory alarm device (8), a timekeeping device (5), and a playback hold period extension operation device (6).
Based on the PM deposition estimated value of the DPF (2) reaching a predetermined regeneration required value, the regeneration suspension period setting device (9) sets the initial regeneration suspension period of the DPF regeneration (S2), and the electron If the control device (20) issues an initial regeneration advisory alarm (S3) with the regeneration advisory alarm device (8) and the extension operation device (6) does not perform the initial extension operation during the initial regeneration suspension period, If the regeneration process (S6) of the DPF (2) is started after the lapse of the initial regeneration hold period and the initial extension operation is performed by the extension operation device (6) during the initial regeneration hold period, the initial regeneration is performed. The playback hold period is configured to be initially extended (S2) after the hold period has elapsed.
The initial extension of the playback hold period (S2) is performed only for the predetermined initial extension period.
During the initial extension period, the electronic control device (20) issues a regeneration advisory alarm (S3) for the extension period with the regeneration advisory alarm device (8), and the extension operation device (6) does not perform the re- extension operation during the initial extension period. In that case, after the lapse of the initial extension period, the regeneration process (S6) of the DPF (2) is started without going through the determination based on the PM deposition estimated value of the DPF (2), and the extension operation is performed during the initial extension period. When the re- extension operation by the device (6) is performed, the regeneration suspension period of the DPF regeneration is configured to be re-extended (S2) after the lapse of the initial extension period. Exhaust treatment device. In the diesel engine exhaust treatment device according to claim 1,
The exhaust gas treatment device for a diesel engine, characterized in that the re-extension (S2) of the regeneration suspension period is performed only for a predetermined re-extension period. In the diesel engine exhaust treatment device according to claim 2.
During the re-extension period, the electronic control device (20) issues a regeneration advisory alarm (S3) during the re-extension period with the regeneration advisory alarm device (8), and during the re-extension period, the extension operation device (6) performs a re-extension operation. If not, the regeneration process (S6) of the DPF (2) is started after the re-extension period elapses, and if the re-extension operation is performed by the extension operation device (6) during the re-extension period, the DPF An exhaust treatment device for a diesel engine, wherein the regeneration suspension period of regeneration is configured to be further re-extended (S2) after the lapse of the re-extension period. In the diesel engine exhaust treatment device according to any one of claims 1 to 3.
The reproduction advisory alarm device (8) is composed of warning lights.
The reproduction advisory warning during the initial reproduction suspension period is continuously lit, and the reproduction advisory alarm in the initial extension period and the reproduction advisory alarm in the re-extension period are blinking with different cycles. Diesel engine exhaust treatment system. In the diesel engine exhaust treatment device according to claim 4.
A diesel engine exhaust treatment device characterized in that the blinking cycle of the regeneration advisory alarm in the re-extension period is set shorter than the blinking cycle of the regeneration advisory alarm in the initial extension period.

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