JP6612190B2 - Diesel engine exhaust treatment equipment - Google Patents

Description

  The present invention relates to an exhaust treatment device for a diesel engine, and more particularly, to an exhaust treatment device for a diesel engine that can suppress a problem of missing a DOC regeneration timing.

Conventional diesel engine exhaust treatment devices include the following (see, for example, Patent Document 1).
A DPF disposed in the engine exhaust path, a DOC disposed on the exhaust upstream side of the DPF, and an electronic control unit,
DPF regeneration processing and DOC regeneration processing are performed according to instructions from the electronic control means,
In the DPF regeneration process, the temperature of the engine exhaust is raised by catalytic combustion of the combustible gas by the DOC, the PM deposited on the DPF is incinerated by the heat of the engine exhaust, and the DPF is regenerated,
In the DOC regeneration process, the temperature of the engine exhaust is increased by the flame combustion of the combustible gas, and the unburned deposits clogged in the DOC are incinerated with the heat of the engine exhaust so that the DOC is regenerated. Diesel engine exhaust treatment equipment.

  This type of exhaust treatment apparatus has an advantage that the DPF can be continuously used by the DPF regeneration process.

  In the invention of Patent Document 1, the DPF regeneration time and the DOC regeneration time are identified by the regeneration pause interval.

JP 2014-196722 A (see FIGS. 3 and 4)

<< Problem >> There is a risk of missing the DOC regeneration time.
In the invention of Patent Document 1, since the DPF regeneration time and the DOC regeneration time are identified by the regeneration pause interval, accurate identification is difficult and the DOC regeneration time may be overlooked.

  The subject of this invention is providing the exhaust-air-treatment apparatus of the diesel engine which can suppress the malfunction which misses DOC reproduction | regeneration time.

(Invention-specific matters common to claim 1, claim 2 , claim 4 and claim 5 )
As illustrated in FIG. 1, a DPF (3) disposed in the engine exhaust path (2), a DOC (16) disposed on the exhaust upstream side of the DPF (3), and an electronic control device (1) are provided. ,
As illustrated in FIG. 2 or FIG. 3, the DPF regeneration process (S2) and the DOC regeneration process (S8) are performed according to the command of the electronic control unit (1) .
As illustrated in FIG. 1, in the DPF regeneration process (S2), the temperature of the engine exhaust (9) is raised by catalytic combustion of the combustible gas (8) by the DOC (16), and the heat of the engine exhaust (9) PM deposited on the DPF (3) is incinerated to regenerate the DPF (3),
In the DOC regeneration process (S8), the temperature of the engine exhaust (9) is increased by the flame combustion of the combustible gas (8), and unburned deposits clogged in the DOC (16) by the heat of the engine exhaust (9). An exhaust treatment device for a diesel engine configured to be incinerated to regenerate the DOC (16).

(Invention specific matter specific to claim 1)
As illustrated in FIG. 1, a DOC regeneration request notification component (10) and a DOC regeneration start operation component (11) are provided.
As illustrated in FIG. 2, when the DPF regeneration failure that does not end even if the DPF regeneration process (S2) elapses for a predetermined time, the DOC regeneration request notifying component (10) informs the DOC regeneration request (S6), and then the DOC. When the reproduction start operation component (11) is operated to start reproduction, the DOC reproduction process (S8) is performed .
As illustrated in FIG. 1, a storage device (70) is provided,
As illustrated in FIG. 2, when a DPF regeneration failure event that does not end even if the DPF regeneration process (S <b> 2) performed after the DOC regeneration process (S <b> 8) has not been completed for a predetermined time has occurred, this is detected. A failure diagnosis code storage process (S10) is performed in response to a command from the electronic control unit (1). In this failure diagnosis code storage process (S10), a failure diagnosis code that can identify the event is stored in the storage device (70). An exhaust treatment device for a diesel engine, characterized in that the exhaust gas treatment device is configured as described above.

(Invention specific matter specific to claim 2)
As illustrated in FIG. 3, the DPF regeneration process (S8) is performed when the DPF regeneration process (S2) does not end even after a predetermined time elapses, and the DOC regeneration process (S8) is performed .
As illustrated in FIG. 1, a storage device (70) is provided,
As illustrated in FIG. 3, when a DPF regeneration failure event that does not end even if the DPF regeneration process (S2) performed after the DOC regeneration process (S8) does not end even after a predetermined time has occurred, this is detected. A failure diagnosis code storage process (S10) is performed in response to a command from the electronic control unit (1). In this failure diagnosis code storage process (S10), a failure diagnosis code that can identify the event is stored in the storage device (70). An exhaust treatment device for a diesel engine, characterized in that the exhaust gas treatment device is configured as described above.
(Invention specific matter specific to claim 4)
As illustrated in FIG. 1, a DOC regeneration request notification component (10) and a DOC regeneration start operation component (11) are provided.
As illustrated in FIG. 2, when the DPF regeneration failure that does not end even if the DPF regeneration process (S2) elapses for a predetermined time, the DOC regeneration request notifying component (10) informs the DOC regeneration request (S6), and then the DOC. When the reproduction start operation component (11) is operated to start reproduction, the DOC reproduction process (S8) is performed.
It is equipped with a combustible gas generator (5) containing a gas generating catalyst (4).
In the DPF regeneration process (S2), liquid fuel (6) and air (7) are supplied to the combustible gas generator (5), and the mixture (14) is combustible by the catalytic reaction of the gas generating catalyst (4). Configured to produce sex gas (8),
As illustrated in FIG. 2, after the completion of the regeneration process (S2) of the DPF (3) and the regeneration process (S8) of the DOC (16), a fuel purge process is performed,
In the fuel purge process, air (7) is supplied to the combustible gas generator (5), and a mixture (14) of the air (7) and the liquid fuel (6) remaining in the combustible gas generator (5). The combustible gas (8) is generated by the catalytic reaction of the gas generating catalyst (4), and the combustible gas (8) is discharged into the engine exhaust path (2). Diesel engine exhaust treatment equipment.
(Invention specific matter specific to claim 5)
As illustrated in FIG. 3, the DPF regeneration process (S8) is performed when the DPF regeneration process (S2) does not end even after a predetermined time elapses, and the DOC regeneration process (S8) is performed.
As illustrated in FIG. 1, a combustible gas generator (5) including a gas generation catalyst (4) is provided.
As illustrated in FIG. 3, in the DPF regeneration process (S2), liquid fuel (6) and air (7) are supplied to the combustible gas generator (5), and a gas generation catalyst of these air-fuel mixture (14). Combustible gas (8) is generated by the catalytic reaction according to (4),
After completion of the regeneration process (S2) of the DPF (3) and the regeneration process (S8) of the DOC (16), a fuel purge process is performed,
In the fuel purge process, air (7) is supplied to the combustible gas generator (5), and a mixture (14) of the air (7) and the liquid fuel (6) remaining in the combustible gas generator (5). The combustible gas (8) is generated by the catalytic reaction of the gas generating catalyst (4), and the combustible gas (8) is discharged into the engine exhaust path (2). Diesel engine exhaust treatment equipment.

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<< Effect 1-1 >> The malfunction which misses DOC reproduction | regeneration time can be suppressed.
As illustrated in FIG. 2, in the present invention, when DPF regeneration fails, the DOC regeneration request notifying component (10) notifies the DOC regeneration request regardless of whether the failure is caused by clogging of the DOC (16) ( Therefore, it is possible to suppress the problem of missing the DOC regeneration time.

<< Effect 1-2 >> Accurate fault diagnosis can be performed.
In the present invention, when an event of a DPF regeneration failure again after the DOC regeneration occurs, this event can be confirmed later by a failure diagnosis code, so that the DPF regeneration failure is clogged in the DOC at the time of failure diagnosis. It can be presumed that it is not caused by DOC but due to a decrease in the catalytic function of the DOC, etc., and an accurate failure diagnosis can be performed.

(Invention of Claim 2)
The invention according to claim 2 has the effect 1-2 of the invention according to claim 1 in addition to the following effect 2 .
<Effect 2 > It is possible to suppress a problem of missing the DOC regeneration time.
As illustrated in FIG. 2, in the present invention, when the DPF regeneration fails, the DOC regeneration process (S8) is automatically performed regardless of the failure due to the clogging of the DOC (16). It is possible to suppress problems that miss the reproduction time.

(Invention of Claim 3 )
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2 .
<Effect 3 > DPF regeneration can be performed with a combustible gas generator having a simple structure.
As illustrated in FIG. 1, in the present invention, the combustible gas (8) can be generated by the combustible gas generator (5) including the gas generating catalyst (4) . The DPF regeneration process (S2) can be performed by the gas generator (5).

(Invention of Claim 4 )
The invention according to claim 4 has the following effect in addition to effect 1-1 of the invention according to claim 1 and effect 3 of the invention according to claim 3 .
<Effect 4-1 > The next DPF regeneration process is facilitated.
In the present invention, after completion of the regeneration process (S2) of the DPF (3) and the regeneration process (S8) of the DOC (16), the liquid fuel (6) remaining in the combustible gas generator (5) is purged. Therefore, when the normal regeneration process (S2) (S8) of the DPF (3) or DOC (16) is completed, the liquid fuel (6) remains in the combustible gas generator (5). Accordingly, the next regeneration process (S2) (S8) of the DPF (3) or DOC (16) is facilitated.

<< Effect 4-2 >> Parts and control used for the fuel purge process can be used together with those used for the regeneration process of the DPF or DOC.
In the present invention, the fuel purge process is performed in the same manner as the regeneration process (S2) (S8) of the DPF (3) or DOC (16), and therefore the components and control used for the fuel purge process are changed to the DPF (3) and DOC. This can also be used for the reproduction processing (S2) and (S8) of (16).
(Invention according to claim 5)
The invention according to claim 5 has the effects of the invention according to claim 2, the effects of the invention according to claim 3, the effects 4-1 and 4-2 of the invention according to claim 4.
(Invention of Claim 6)
The invention according to claim 6 has the effect 1-2 of the invention according to claim 1 in addition to the effect of the invention according to claim 4 or 5.

(Invention of Claim 7 )
The invention according to claim 7 has the following effects in addition to the effects of the invention according to any one of claims 3 to 6 .
<Effect> Even when the temperature of the engine exhaust is low, the regeneration process of the DPF is possible.
In the present invention, in the DPF regeneration process (S2), when the estimated temperature of the DOC (16) does not reach the predetermined activation temperature, the combustible gas (8) is ignited by the ignition component (17) and combustible. Since the temperature of the DOC (16) is increased by flame combustion of the property gas (8), the regeneration process (S2) (S11) of the DPF (3) is possible even when the temperature of the engine exhaust (9) is low.

(Invention of Claim 8 )
The invention according to claim 8 has the following effect in addition to the effect of the invention according to claim 7 .
<< Effect >> The DOC regeneration process can be performed in the same manner as the activation of the DOC.
As illustrated in FIG. 1, in the DOC regeneration process (S8), the ignition component (17) ignites the combustible gas (8) in the same manner as the activation of the DOC (16) in the DPF regeneration process (S2). Therefore, the DOC regeneration process (S8) can be performed in the same manner as the activation of the DOC (16).

It is a mimetic diagram of a diesel engine mounting machine concerning a 1st embodiment of the present invention. It is a flowchart of a DPF regeneration process and a DOC regeneration process by the control device used in the first embodiment of FIG. FIG. 3 is a view corresponding to FIG. 2 of a second embodiment of the present invention.

  FIG. 1 and FIG. 2 are diagrams illustrating a diesel engine mounting machine according to the first embodiment of the present invention, and FIG. 3 is a diagram illustrating a diesel engine mounting machine according to a second embodiment of the present invention.

First, the first embodiment will be described.
This engine-equipped machine is equipped with a diesel engine (15).
As the engine-mounted machine, an industrial machine such as an agricultural machine such as an agricultural tractor and a rice transplanter, a construction machine such as a backhoe, a transport machine such as a forklift, and a stationary machine such as an engine generator can be used.

As shown in FIG. 1, a diesel engine (15) mounted on this engine-equipped machine includes a crankshaft (19) installed in a crankcase (18) and a piston (21 fitted in a cylinder (20)). ), A connecting rod (21a) interposed between the crankshaft (19) and the piston (21), a combustion chamber (22) formed in the cylinder (20), and an intake device (not shown). The fuel supply device (23), the electronic governor (30), and the exhaust device (24) are provided.

The intake device supplies air (7) to the combustion chamber (22).
The fuel supply device (23) includes a fuel tank (25), a fuel feed pump (26), a fuel injection pump (27), a fuel injection camshaft (28), and a fuel provided in the combustion chamber (22). An injection valve (29) is provided, and the liquid fuel (6) in the fuel tank (25) is pumped to the fuel injection pump (27) by the fuel feed pump (26 ) and driven by the fuel injection cam shaft (28). The fuel injection pump (27) injects the fuel from the fuel injection valve (29) into the combustion chamber (22) and burns with the compression heat of the air (7) in the combustion chamber (22). The liquid fuel (6) is light oil.

The electronic governor (30) controls the engine speed.
The electronic governor (30) includes a metering control unit of the electronic control device (1), a governor actuator (31), and a biasing component (32), and a fuel metering rack (33) of the fuel injection pump (27). is pressed against the governor actuator (31) by the biasing force of the biasing part (32), following to the metering position to the operation of the governor actuator (31) is adjusted.

The electronic control unit (1) includes an accelerator sensor (35) for detecting the speed setting position information of the accelerator operating component (34), and an actual rotational speed sensor (36) for detecting the rotational speed information of the crankshaft (19). Are electrically connected.
The electronic governor (30) has a governor actuator (31) in a metering control unit of the electronic control unit (1) so that a rotational deviation between the target rotational speed detected based on the accelerator operation position information and the actual rotational speed becomes small. , The metering position of the fuel metering rack (33) of the fuel injection pump (27) is controlled, and the injection amount of the liquid fuel (6) injected from the fuel injection valve (29) into the combustion chamber (22) Adjust.

An engine ECU is used for the electronic control unit (1). The engine ECU is an abbreviation for engine electronic control unit and is a microcomputer.
A linear solenoid is used for the governor actuator (31).
An accelerator operating lever is used for the accelerator operating component (34). An accelerator operation pedal, an accelerator operation button, or an accelerator operation switch can be used for the accelerator operation component (34).

  A battery (37) and a key switch (12) are connected to the electronic control unit (1). When the key switch (12) is turned on to the engine operation position, the engine operation is performed by energizing each part of the engine from the battery (37). When the key switch (12) is turned on at the engine stop position, the power supply from the battery (37) to each part of the engine is stopped, and the urging force of the engine stop spring (not shown) in the governor actuator (31) The fuel metering rack (33) is pushed to the no fuel injection position, the injection of the liquid fuel (6) from the fuel injection valve (29) is stopped, and the diesel engine (15) is stopped.

The exhaust device (24) discharges the engine exhaust (9) from the combustion chamber (22).
The exhaust device (24) includes an engine exhaust path (2), and the engine exhaust path (2) is disposed on the exhaust downstream side of the exhaust port (38), the exhaust manifold (39), and the exhaust manifold (39). The engine exhaust treatment path (40) and the exhaust treatment device (41) provided in the engine exhaust treatment path (40) are provided. The engine exhaust (9) discharged from the combustion chamber (22) After being processed in 41), it is discharged to the atmosphere from the engine exhaust path (2).

As shown in FIG. 1, the exhaust treatment device (41) includes a DPF (3) disposed in the engine exhaust path (2), a DOC (16) disposed on the exhaust upstream side of the DPF (3), an electron A control device (1) is provided.
As shown in FIG. 2, in the exhaust treatment device (41), a DPF regeneration process (S2) and a DOC regeneration process (S8) are performed according to a command from the electronic control device (1) .
As shown in FIG. 1, in the DPF regeneration process (S2), the engine exhaust (9) is heated by catalytic combustion of the combustible gas (8) by the DOC (16), and the DPF is heated by the heat of the engine exhaust (9). The PM deposited in (3) is incinerated to regenerate DPF (3).
In the DOC regeneration process (S8), the temperature of the engine exhaust (9) is increased by the flame combustion of the combustible gas (8), and unburned deposits clogged in the DOC (16) by the heat of the engine exhaust (9). Incinerated and DOC (16) is regenerated.
The exhaust treatment device (41) has an advantage that the DPF (3) can be continuously used by the DPF regeneration process (S2).

The DPF (3) captures PM contained in the engine exhaust (9).
DPF is an abbreviation for diesel particulate filter, and PM is an abbreviation for particulate matter. In the DPF (3), a wall flow type ceramic honeycomb in which a large number of cells along the axial length direction are arranged in parallel and the inlets and outlets of adjacent cells are alternately sealed is used.
A DPF case (42) is disposed in the engine exhaust treatment path (40), and the DPF (3) is accommodated in the DPF case (42).
The electronic control unit (1) is a common item with the electronic governor (30).

DOC is an abbreviation for diesel oxidation catalyst.
DOC (16) is a flow-through ceramic honeycomb having a cylindrical shape and a large number of cells extending in the axial direction along the inside. The oxidation catalyst component such as platinum or palladium rhodium is contained in the cell. It is supported.
The DOC (16) is accommodated in the DPF case (42) on the exhaust upstream side of the DPF (3).

A combustible gas generator (5) is provided in the engine exhaust treatment path (40) on the exhaust upstream side of the DPF (3).
The combustible gas generator (5) includes an air-fuel mixture mixer (43), a catalyst storage chamber (44) communicating with the air-fuel mixture outlet of the air-fuel mixture mixer (43), and a gas stored in the catalyst storage chamber (44). A production catalyst (4), a combustible gas passage (45) communicating with the gas outlet of the gas production catalyst (4), and a secondary air mixer (46) communicating with the gas outlet of the combustible gas passage (45); An ignition chamber (47) communicating with the gas outlet of the secondary air mixer (46) and a combustible gas merging exhaust passage (48) communicating with the gas outlet of the ignition chamber (47) are provided. 48) constitutes a part of the engine exhaust treatment path (40) on the exhaust upstream side of the DPF (3).
The combustible gas generator (5) includes a secondary air passage (66), and a secondary air mixer (46) communicates with the secondary air outlet (67). The secondary air mixer (46) is provided with a cap-shaped gas nozzle (68) communicating with the gas outlet of the combustible gas passage (45), and is ejected from the gas nozzle (68) in the radial direction of the secondary air mixer (46). The combustible gas (8) is mixed with the secondary air (7) swirling along the circumferential direction of the gas nozzle (68).

  An air introduction passage (50) led out from the air supply pump (49) and a fuel introduction passage (52) led out from the fuel supply pump (51) are connected to the air-fuel mixture mixer (43), and an air cleaner (53 ) And the liquid fuel (6) in the fuel tank (25) are introduced into the air-fuel mixture mixer (43), and the air-fuel mixture (14) of the liquid fuel (6) and air (7) is introduced. It is formed.

The gas generation catalyst (4) is an oxidation catalyst, promotes oxidation of the gas mixture (14) by catalytic reaction, thermally decomposes the liquid fuel (6) with the reaction heat, and combusts the low temperature ignitable combustible gas (8). Is generated. The catalyst carrier of the gas generating catalyst (4) is made by weaving iron chromium wire into a truncated cone shape, and rhodium is supported on this catalyst carrier as a catalyst component.
The secondary air mixer (46) communicates with the gas outlet of the combustible gas passage (45) and the secondary air outlet (67) of the secondary air passage (66). A secondary air introduction passage (55) led out from the air supply pump (49 ) is connected to the air inlet.

  Combustible gas (8) and secondary air (7) purified by an air cleaner (53) are introduced into the secondary air mixer (46). In the secondary air mixer (46), combustible gas (8) is introduced. ) And secondary air (7) are mixed, and the combustible gas (8) containing the secondary air (7) flows from the secondary air mixer (46) through the ignition chamber (47) (combustible gas combined exhaust passage ( 48) is combined with the engine exhaust (9) passing through 48) and sent to the DPF (3) on the exhaust downstream side. In the ignition chamber (47), the combustible gas (8) is ignited as necessary.

A starting catalyst (56) is provided at the gas mixture inlet of the gas generating catalyst (4), an electric heater (57) is inserted into the starting catalyst (56), and a catalyst is provided at the gas outlet side of the gas generating catalyst (4). A temperature sensor (58) is inserted.
The catalyst carrier of the starting catalyst (56) is an alumina fiber mat, and this catalyst carrier carries rhodium as a catalyst component. The catalyst carrier of the starting catalyst (56) has a narrow void in the tissue and high retention of the liquid fuel (6) compared to the catalyst carrier of the gas generating catalyst (4) .

The air supply pump (49) is an electric blower, and the fuel supply pump (51) is an electric pump.
Electric metering valves (50a), (52a) and (55a) are provided in the air introduction passage (50), the fuel introduction passage (52) and the secondary air introduction passage (55), respectively.
The air supply pump (49), the fuel supply pump (51), the metering valves (50a) (52a) (55a), the electric heater (57), and the catalyst temperature sensor (58) are all electronic control units (1). Is electrically connected.
In the regeneration process of the DPF (3), the electric heater (57) generates heat in response to a command from the electronic control unit (1), and the startup catalyst (56) is preheated by the heat, and then the mixture (14) is started up. When the gas generating catalyst (4) is warmed up by catalytic combustion of the starting catalyst (56) and the temperature of the gas generating catalyst (4) reaches a predetermined warm-up end temperature, the gas generating catalyst ( The supply amount of the air-fuel mixture (14) to 4) is increased, the air-fuel mixture (14) diffuses throughout the gas generating catalyst (4), and a combustible gas (8) is generated by the catalytic reaction.

As shown in FIG. 1, the exhaust treatment device (41) includes a DOC regeneration request notification component (10) and a DOC regeneration start operation component (11).
As shown in FIG. 2, when the DPF regeneration failure does not end even if the DPF regeneration process (S2) elapses for a predetermined time, the DOC regeneration request notifying component (10) informs the DOC regeneration request (S6), and then the DOC regeneration. When the start operation component (11) is operated to start playback, DOC playback processing (S8) is performed.
As shown in FIG. 2, in the exhaust treatment device (41), when the DPF regeneration fails, the DOC regeneration request notification component (10) sends a DOC regeneration request regardless of whether or not the failure is caused by clogging of the DOC (16). (S6), it is possible to suppress the problem of missing the DOC regeneration time.

As shown in FIG. 1, the exhaust treatment device (41) includes a DPF regeneration notification component (13). During the DPF regeneration process (S2), the fact is notified by the DPF regeneration notification component (13).
For the DOC regeneration request notification component (10) and the DPF regeneration notification component (13), a lamp disposed on the dashboard (59) of the engine-equipped machine is used, and the notification during the DPF regeneration process (S2) is DPF regeneration. The notification part (13) lamp is continuously turned on, the DOC regeneration request notification (S6) is performed by the blinking of the DOC regeneration request notification part (10), and the notification during the DOC regeneration process (S8) is performed. The DOC regeneration request notification component (10) is continuously turned on. During the DOC regeneration process (S8), the lamp of the DPF regeneration notification component (13) is turned off.

As the DOC regeneration request notification component (10), an indicator lamp, an LED, a liquid crystal display, an organic EL display, an alarm buzzer, or the like provided on the dashboard (59) can be used. LED is a light-emitting diode, and EL is an abbreviation for electroluminescence.
As the DOC regeneration start operation component (11) , a start operation lever disposed on the dashboard (59) of the engine-equipped machine is used, and a start operation is performed by switching from the stop position to the start position.
As the DOC regeneration start operation component (11), a start operation button disposed on the dashboard (59) or the like or a start operation pedal disposed on the driver's seat can be used.

As shown in FIG. 1, the exhaust treatment device (41) includes a storage device (70).
As shown in FIG. 2, when a DPF regeneration failure event that does not end even if the DPF regeneration process (S2) performed after the DOC regeneration process (S8) has not been completed for a predetermined time has occurred, the detected electronic A failure diagnosis code storage process (S10) is performed according to a command from the control device (1). In this failure diagnosis code storage process (S10), a failure diagnosis code that can identify the event is stored in the storage device (70). .
In the exhaust treatment device (41), when a second DPF regeneration failure event after DOC regeneration occurs, this event can be confirmed later with a failure diagnosis code. It can be estimated that it is not due to clogging of the DOC but due to a decrease in the catalytic function of the DOC, etc., and an accurate failure diagnosis can be performed.

The storage device (70) is a non-volatile memory such as a flash memory.
The failure diagnosis code is indicated by a multi-digit number or symbol.
The exhaust treatment device (41) includes a monitor (71) and a port (72).
A failure diagnosis code is displayed on the monitor (71).
A plug of a failure diagnosis tool is inserted into the port (72), and a failure diagnosis code is displayed on the display of the failure diagnosis tool.
The monitor (71) and the port (72) are arranged on the dashboard (59) of the engine-equipped machine.
A liquid crystal display, an organic EL display, or the like can be used for the monitor (71). EL is an abbreviation for electroluminescence.
As the port (72), a USB port or the like can be used. USB is an abbreviation for Universal Serial Bus.
As the failure diagnosis tool, a notebook computer or a portable terminal installed with a failure diagnosis program can be used.

As shown in FIG. 1, the exhaust treatment device (41) includes a combustible gas generator (5) containing a gas generation catalyst (4) .
In the DPF regeneration process (S2), liquid fuel (6) and air (7) are supplied to the combustible gas generator (5), and the mixture (14) is combustible by the catalytic reaction of the gas generating catalyst (4). Sex gas (8) is produced.
As shown in FIG. 1, in the exhaust treatment device (41), the combustible gas (8) can be generated by the combustible gas generator (5) including the gas generating catalyst (4). The DPF regeneration process (S2) becomes possible with the combustible gas generator (5).

As shown in FIG. 1, the exhaust treatment device (41) includes an ignition component (17) disposed on the exhaust upstream side of the DOC (16).
In the DPF regeneration process (S2), the combustible gas (8) is ignited by the ignition component (17) based on the fact that the estimated temperature of the DOC (16) has not reached the predetermined activation temperature. The engine exhaust (9) is heated by the flame combustion of (8), the DOC (16) is heated by the heat of the engine exhaust (9), and the DOC (16) is activated.
In this exhaust treatment device (41), even when the temperature of the engine exhaust (9) is low, the regeneration process (S2) (S11) of the DPF (3) is possible.

As shown in FIG. 1, in the DOC regeneration process (S8), the combustible gas (8) is ignited by the ignition component (17) in the same manner as the activation of the DOC (16) in the DPF regeneration process (S2). The engine exhaust (9) is heated more than when the DOC (16) is activated.
In the DOC regeneration process (S8), the combustible gas (8) is ignited by the ignition component (17) in the same manner as the activation of the DOC (16) in the DPF regeneration process (S2). The DOC regeneration process (S8) can be performed in the same manner as the activation of).

The ignition component (17) is disposed in the ignition chamber (47) of the exhaust treatment device (41), the DOC inlet exhaust temperature sensor (62) is disposed at the exhaust inlet of the DOC (3), and the ignition component (17) and the DOC inlet are disposed. When the exhaust gas temperature sensor (62) is electrically connected to the electronic control unit (1) and the inlet exhaust temperature of the DOC (3) does not reach the activation temperature of the DOC (3), the inlet of the DOC (3) In response to a command from the electronic control device (1) based on the exhaust gas temperature information, the ignition component (17) generates heat, and the combustible gas (8) is ignited.
A glow plug is used for the ignition component (17). A spark plug or a burner can be used for the ignition component (17).
An ignition detection sensor (54) is arranged in the ignition chamber (47), and this ignition detection sensor (54) is electrically connected to the electronic control unit (1), and the ignition chamber detected by the ignition detection sensor (54). Based on the temperature information of (47), the electronic control unit (1) determines whether or not the combustible gas (8) is ignited.

The temperature of the engine exhaust (9) is controlled by adjusting the amount of combustible gas (8) produced.
A DPF inlet exhaust temperature sensor (63) is disposed at the exhaust inlet of the DPF (3), and a combustible gas (8) is generated by a command from the electronic control unit (1) based on DPF inlet exhaust temperature information detected by the sensor (63). ) Is adjusted, and the DPF inlet exhaust temperature is controlled to a predetermined regeneration temperature.
A DPF outlet exhaust temperature sensor (64) is disposed at the exhaust outlet of the DPF (3), and a command from the electronic control unit (1) based on the DPF outlet exhaust temperature information detected by the sensor (64) is used to output the DPF (3 ) Is stopped, and excessive combustion of PM in the DPF (3) is prevented.

In this exhaust treatment device (41), the fuel purge process is performed after the regeneration process (S2) of the DPF (3) and the regeneration process (S8) of the DOC (16) are completed.
In the fuel purge process, air (7) is supplied to the combustible gas generator (5), and a mixture (14) of the air (7) and the liquid fuel (6) remaining in the combustible gas generator (5). The combustible gas (8) is generated by the catalytic reaction of the gas generating catalyst (4), and the combustible gas (8) is discharged into the engine exhaust path (2).
In this exhaust treatment device (41), the liquid fuel remaining in the combustible gas generator (5) after the completion of the regeneration process (S2) of the DPF (3) and the regeneration process (S8) of the DOC (16). Since (6) is purged, when normal regeneration processing (S2) (S8) of DPF (3) and DOC (16) is completed, liquid fuel (5) is supplied to the combustible gas generator (5). 6) does not remain, and the next regeneration process (S2) (S8) of DPF (3) and DOC (16) is facilitated.
In this exhaust treatment device (41), the fuel purge process is performed in the same manner as the regeneration process (S2) (S8) of the DPF (3) or the DOC (16). It can also be used for (3) and DOC (16) reproduction processing (S2) (S8).

The flow of DPF regeneration processing and DOC regeneration processing by the electronic control device shown in FIG. 2 is as follows. In step (S1), the regeneration start determination of DPF (3) is made. When the estimated accumulation value of PM deposited on the DPF (3) has reached a predetermined regeneration start determination value, the determination is affirmed and the process proceeds to step (S2). If the determination is negative, step (S1) is repeated until the determination is positive. The PM accumulation estimated value is estimated by the electronic control unit (1) based on the differential pressure information at the inlet and outlet of the DPF (3) detected by the differential pressure sensor (65) shown in FIG.
In step (S2), the DPF regeneration process is started, and the process proceeds to step (S3).
In step (S3), a DPF regeneration end determination is made. When the estimated accumulation value of PM deposited on the DPF (3) has reached a predetermined regeneration end determination value, the determination is affirmed, DPF regeneration is successful, and the process returns to step (S1).
If the determination in step (S3) is negative, the process proceeds to step (S4).

  In step (S4), a failure determination of the DPF regeneration process is made. If the accumulated time of the DPF regeneration process has reached the predetermined failure determination time, the determination is affirmed and DPF regeneration fails, and the process proceeds to step (S5). If the determination is negative, the process returns to step (S2) and the DPF regeneration process is continued.

In step (S5), the type of DPF regeneration failure is determined. If the DPF regeneration failure is not a failure after DOC regeneration, the determination is negative and the process proceeds to step (S6). In step (S6), a DOC regeneration request is notified, and the process proceeds to step (S7).
In step (S7), it is determined whether or not a DOC regeneration start operation has been performed. If the determination is affirmative, the process proceeds to step (S8). If the determination is negative, the process returns to step (S6).
In step (S8), a DOC reproduction process is performed, and the process proceeds to step (S9).
In step (S9), the end of DOC playback is determined. If the DOC playback time has reached a predetermined DOC playback end determination value, the determination is affirmed, the DOC playback process is ended, and the process returns to step (S1).

  If it is determined in step (S5) that the DPF regeneration failure is a failure after DOC regeneration, the determination is affirmed and the process proceeds to step (S10). In step (S10), a failure diagnosis code for identifying the event that has occurred is stored, and the process ends.

Next, a second embodiment will be described.
As shown in FIG. 3, in the second embodiment, the DOC regeneration process (S8) is performed when the DPF regeneration failure that does not end even after the predetermined time elapses (S2) is performed.
In the second embodiment, when the DPF regeneration fails, the DOC regeneration process (S8) is automatically performed regardless of whether the failure is caused by clogging of the DOC (16). Can be suppressed.

  The flow of the DPF regeneration process and the DOC regeneration process by the electronic control device of the second embodiment shown in FIG. 3 is the same as the flowchart of the first embodiment shown in FIG. 2 except that step (S6) and step (S7) are deleted. If the determination in step (S5) is negative, the process proceeds to step (S8). Other steps are the same as those in the flowchart shown in FIG. In FIG. 3, the same steps as those in the first embodiment are denoted by the same reference numerals as those in FIG.

  (1) ... Electronic control unit, (2) ... Engine exhaust path, (3) ... DPF, (4) ... Gas generating catalyst, (5) ... Combustible soot generator, (6) ... Liquid fuel, (7) Air, (8) Combustible gas, (9) Engine exhaust, (10) DOC regeneration request notification component, (11) DOC regeneration start operation component.

Claims (8)

A DPF (3) disposed in the engine exhaust path (2), a DOC (16) disposed on the exhaust upstream side of the DPF (3), and an electronic control unit (1),
DPF regeneration processing (S2) and DOC regeneration processing (S8) are performed according to the command of the electronic control unit (1) ,
In the DPF regeneration process (S2), the temperature of the engine exhaust (9) is raised by catalytic combustion of the combustible gas (8) by the DOC (16), and the PM accumulated in the DPF (3) by the heat of the engine exhaust (9) Is incinerated and DPF (3) is regenerated,
In the DOC regeneration process (S8), the temperature of the engine exhaust (9) is increased by the flame combustion of the combustible gas (8), and unburned deposits clogged in the DOC (16) by the heat of the engine exhaust (9). In an exhaust treatment device for a diesel engine configured to be incinerated and to regenerate the DOC (16),
A DOC regeneration request notification component (10) and a DOC regeneration start operation component (11),
When the DPF regeneration failure does not end even if the DPF regeneration process (S2) elapses for a predetermined time, the DOC regeneration request notification component (10) informs the DOC regeneration request (S6), and then the DOC regeneration start operation component (11) When the reproduction start operation is performed, the DOC reproduction process (S8) is performed .
A storage device (70);
If a DPF regeneration failure event that does not end even if the DPF regeneration process (S2) performed after the DOC regeneration process (S8) has not been completed for a predetermined time has occurred, the command of the electronic control unit (1) that has detected this event The failure diagnosis code storage process (S10) is performed by this, and in this failure diagnosis code storage process (S10), a failure diagnosis code capable of specifying the event is stored in the storage device (70). An exhaust treatment device for a diesel engine characterized by the above. A DPF (3) disposed in the engine exhaust path (2), a DOC (16) disposed on the exhaust upstream side of the DPF (3), and an electronic control unit (1),
DPF regeneration processing (S2) and DOC regeneration processing (S8) are performed according to the command of the electronic control unit (1) ,
In the DPF regeneration process (S2), the temperature of the engine exhaust (9) is raised by catalytic combustion of the combustible gas (8) by the DOC (16), and the PM accumulated in the DPF (3) by the heat of the engine exhaust (9) Is incinerated and DPF (3) is regenerated,
In the DOC regeneration process (S8), the temperature of the engine exhaust (9) is increased by the flame combustion of the combustible gas (8), and unburned deposits clogged in the DOC (16) by the heat of the engine exhaust (9). In an exhaust treatment device for a diesel engine configured to be incinerated and to regenerate the DOC (16),
The DPF regeneration process (S8) is configured so that the DPF regeneration process (S8) is performed at the time of DPF regeneration failure that does not end even if the predetermined time elapses .
A storage device (70);
If a DPF regeneration failure event that does not end even if the DPF regeneration process (S2) performed after the DOC regeneration process (S8) has not been completed for a predetermined time has occurred, the command of the electronic control unit (1) that has detected this event The failure diagnosis code storage process (S10) is performed by this, and in this failure diagnosis code storage process (S10), a failure diagnosis code capable of specifying the event is stored in the storage device (70). An exhaust treatment device for a diesel engine characterized by the above. In the exhaust treatment device for a diesel engine according to claim 1 or 2 ,
It is equipped with a combustible gas generator (5) containing a gas generating catalyst (4) .
In the DPF regeneration process (S2), liquid fuel (6) and air (7) are supplied to the combustible gas generator (5), and the mixture (14) is combustible by the catalytic reaction of the gas generating catalyst (4). An exhaust treatment device for a diesel engine, characterized in that the gas (8) is generated. A DPF (3) disposed in the engine exhaust path (2), a DOC (16) disposed on the exhaust upstream side of the DPF (3), and an electronic control unit (1),
DPF regeneration processing (S2) and DOC regeneration processing (S8) are performed according to the command of the electronic control unit (1) ,
In the DPF regeneration process (S2), the temperature of the engine exhaust (9) is raised by catalytic combustion of the combustible gas (8) by the DOC (16), and the PM accumulated in the DPF (3) by the heat of the engine exhaust (9) Is incinerated and DPF (3) is regenerated,
In the DOC regeneration process (S8), the temperature of the engine exhaust (9) is increased by the flame combustion of the combustible gas (8), and unburned deposits clogged in the DOC (16) by the heat of the engine exhaust (9). In an exhaust treatment device for a diesel engine configured to be incinerated and to regenerate the DOC (16),
A DOC regeneration request notification component (10) and a DOC regeneration start operation component (11),
When the DPF regeneration failure does not end even if the DPF regeneration process (S2) elapses for a predetermined time, the DOC regeneration request notification component (10) informs the DOC regeneration request (S6), and then the DOC regeneration start operation component (11) When the reproduction start operation is performed, the DOC reproduction process (S8) is performed .
It is equipped with a combustible gas generator (5) containing a gas generating catalyst (4) .
In the DPF regeneration process (S2), liquid fuel (6) and air (7) are supplied to the combustible gas generator (5), and the mixture (14) is combustible by the catalytic reaction of the gas generating catalyst (4). Configured to produce sex gas (8) ,
After completion of the regeneration process (S2) of the DPF (3) and the regeneration process (S8) of the DOC (16), a fuel purge process is performed,
In the fuel purge process, air (7) is supplied to the combustible gas generator (5), and a mixture (14) of the air (7) and the liquid fuel (6) remaining in the combustible gas generator (5). The combustible gas (8) is generated by the catalytic reaction of the gas generating catalyst (4), and the combustible gas (8) is discharged into the engine exhaust path (2). Diesel engine exhaust treatment equipment. A DPF (3) disposed in the engine exhaust path (2), a DOC (16) disposed on the exhaust upstream side of the DPF (3), and an electronic control unit (1),
DPF regeneration processing (S2) and DOC regeneration processing (S8) are performed according to the command of the electronic control unit (1) ,
In the DPF regeneration process (S2), the temperature of the engine exhaust (9) is raised by catalytic combustion of the combustible gas (8) by the DOC (16), and the PM accumulated in the DPF (3) by the heat of the engine exhaust (9) Is incinerated and DPF (3) is regenerated,
In the DOC regeneration process (S8), the temperature of the engine exhaust (9) is increased by the flame combustion of the combustible gas (8), and unburned deposits clogged in the DOC (16) by the heat of the engine exhaust (9). In an exhaust treatment device for a diesel engine configured to be incinerated and to regenerate the DOC (16),
The DPF regeneration process (S8) is configured so that the DPF regeneration process (S8) is performed at the time of DPF regeneration failure that does not end even if the predetermined time elapses .
It is equipped with a combustible gas generator (5) containing a gas generating catalyst (4) .
In the DPF regeneration process (S2), liquid fuel (6) and air (7) are supplied to the combustible gas generator (5), and the mixture (14) is combustible by the catalytic reaction of the gas generating catalyst (4). Configured to produce sex gas (8) ,
After completion of the regeneration process (S2) of the DPF (3) and the regeneration process (S8) of the DOC (16), a fuel purge process is performed,
In the fuel purge process, air (7) is supplied to the combustible gas generator (5), and a mixture (14) of the air (7) and the liquid fuel (6) remaining in the combustible gas generator (5). The combustible gas (8) is generated by the catalytic reaction of the gas generating catalyst (4), and the combustible gas (8) is discharged into the engine exhaust path (2). Diesel engine exhaust treatment equipment. In the exhaust treatment device for a diesel engine according to claim 4 or 5 ,
A storage device (70);
If a DPF regeneration failure event that does not end even if the DPF regeneration process (S2) performed after the DOC regeneration process (S8) has not been completed for a predetermined time has occurred, the command of the electronic control unit (1) that has detected this event The failure diagnosis code storage process (S10) is performed by this, and in this failure diagnosis code storage process (S10), a failure diagnosis code capable of specifying the event is stored in the storage device (70). An exhaust treatment device for a diesel engine characterized by the above. In the exhaust treatment device for a diesel engine according to any one of claims 3 to 6 ,
An ignition component (17) disposed on the exhaust upstream side of the DOC (16);
In the DPF regeneration process (S2), the combustible gas (8) is ignited by the ignition component (17) based on the fact that the estimated temperature of the DOC (16) has not reached the predetermined activation temperature. The engine exhaust (9) is heated by the flame combustion of (8), the DOC (16) is heated by the heat of the engine exhaust (9), and the DOC (16) is activated. An exhaust treatment device for a diesel engine, characterized in that In the exhaust treatment device for a diesel engine according to claim 7 ,
In the DOC regeneration process (S8), in the same manner as the activation of the DOC (16) in the DPF regeneration process (S2), the combustible gas (8) is ignited by the ignition component (17), and the DOC (16) is An exhaust treatment apparatus for a diesel engine, characterized in that the engine exhaust (9) is configured to have a higher temperature than in the case of activation.

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