JP6176355B1 - Internal combustion engine filter regeneration control system and internal combustion engine filter regeneration control method - Google Patents

Abstract

In an automatic regeneration process of a DPF that collects particulate matter in exhaust gas of an internal combustion engine, it is possible for a worker to perform a low-load operation without trouble without being aware of automatic regeneration. A filter regeneration control system for an internal combustion engine and a filter regeneration control method for an internal combustion engine that can achieve both automatic regeneration of a DPF that does not depend on the intention of the operator and work that is performed by the intention of the operator, and can suppress a decrease in work efficiency. provide. A control device starts automatic regeneration when the amount of particulate matter accumulated exceeds a regeneration start threshold, and during execution of automatic regeneration, in a filter regeneration combustion mode in which the temperature of exhaust gas is raised. When the internal combustion engine is controlled and the indicated target rotational speed instructed from the target rotational instruction section is less than the lower limit rotational speed for regeneration, the lower limit rotational speed of the internal combustion engine is determined according to the state of the operation lock section. Alternatively, control is performed by switching to one of the regeneration lower limit rotational speeds, and the regeneration processing execution unit is controlled in accordance with the temperature of the catalyst. [Selection] Figure 3

Description

  The present invention relates to a filter regeneration control system for an internal combustion engine and a filter regeneration control method for an internal combustion engine.

A vehicle equipped with a diesel engine (internal combustion engine) as a power source is a DPF (Diesel Particulate) for collecting PM (Particulate Matter), which is particulate matter contained in the exhaust gas, on the exhaust path. It has a particle collection filter called Filter. When particulate matter of a predetermined amount or more is deposited on the DPF, so-called “regeneration processing” is performed, in which the particulate matter in the DPF is burned and incinerated to avoid the problem of increased exhaust pressure due to clogging of the DPF. Is called. In the regeneration process, PM deposited in the DPF is burned by burning by performing the following (1) to (3).
(1) In order to secure the flow rate of exhaust gas necessary for combustion incineration of PM accumulated in the DPF, the minimum number of revolutions of the internal combustion engine is raised (idle revolution number UP).
(2) In order to activate the oxidation catalyst provided upstream of the DPF by intentionally increasing the temperature of the exhaust gas of the internal combustion engine, a delay in the injection timing or injection relative to the normal fuel injection Shift to a special combustion mode to increase the amount.
(3) Fuel is injected from an addition valve (addition valve provided upstream of the oxidation catalyst) provided in the exhaust path of exhaust gas discharged from the engine, and activated by the oxidation catalyst upstream of the DPF ((2) above) This fuel is combusted (oxidized) by the oxidation catalyst), and the exhaust gas that has become high temperature by the reaction heat of the oxidation catalyst is introduced into the DPF.

  In addition, the “reproduction processing” includes mainly two types of processing. One is a process called “manual reproduction”, and the other is a process called “automatic reproduction”. When the internal combustion engine is operated and the amount of PM deposited on the DPF increases, the amount of PM deposited eventually reaches the automatic regeneration deposition range, and when the amount of PM deposition further increases, the PM deposition amount exceeds the automatic regeneration deposition range. .

  Manual regeneration is a process in which execution is started by a predetermined operation according to the operator's intention when the PM accumulation amount in the DPF exceeds the automatic regeneration accumulation range. In manual regeneration, normal use of the internal combustion engine is prohibited, and only PM combustion in the DPF is incinerated (in the case of a work vehicle, work cannot be performed during execution of manual regeneration). For example, when it is determined that the PM accumulation amount in the DPF exceeds the automatic regeneration accumulation range, the control device for the internal combustion engine displays display means for prompting execution of manual regeneration, and allows the operator to perform manual regeneration. Prompt. When the operator confirms the prompt for manual regeneration, the worker moves the work vehicle to a safe place, sets the internal combustion engine to an idling state, performs a predetermined operation (such as operation of a manual regeneration button), and starts manual regeneration. Upon recognizing a predetermined operation from the operator, the control device performs the idling speed UP of the internal combustion engine, the shift of the combustion mode, and the fuel injection from the addition valve in the above (1) to (3), and enters the DPF. Burn and incinerate the accumulated PM.

  The automatic regeneration is a process in which execution is automatically started regardless of the operator's intention when the PM accumulation amount in the DPF is within the automatic regeneration accumulation range. In the automatic regeneration, in parallel with the use of the internal combustion engine, the PM accumulated in the DPF is automatically burned and incinerated (in the case of a work vehicle, the operator may Can be performed using an internal combustion engine). For example, the control device for an internal combustion engine starts automatic regeneration regardless of the operator's intention when the PM regeneration amount in the DPF is within the automatic regeneration accumulation range, and the automatic regeneration execution condition is satisfied. (1) to (3), the internal combustion engine idle speed UP, the transition to the combustion mode, and the fuel injection from the addition valve are performed, and the PM accumulated in the DPF is combusted and incinerated.

  For example, Patent Document 1 discloses an exhaust gas purification system for a working vehicle that performs DPF regeneration processing. In this exhaust gas purification system, when the amount of PM accumulated in the DPF exceeds a predetermined amount, the display unit or the like prompts the operator to execute the regeneration process of the DPF. In the exhaust gas purification system, an operator operates a manual regeneration start switch or the like, operates an engine control dial so as to become a low idle command, and disables generation of control pilot pressure by a remote control valve for a gate lock lever. When this is operated, the DPF regeneration process is started. Even during manual regeneration, the operator can forcibly terminate manual regeneration and enable work by operating the gate lock lever to the working position (first position). .

JP 2012-255443 A

  The DPF regeneration process (manual regeneration and automatic regeneration) as described above takes a relatively long time from the start of the regeneration process until the PM accumulated in the DPF becomes less than a predetermined amount and the regeneration process is completed. . In particular, when performing manual regeneration of the DPF as in Patent Document 1, work by the work vehicle is completely prohibited during execution of the regeneration process, so that the waiting time until the regeneration process is completed is This is a heavy burden on the driver of the vehicle (working efficiency is greatly reduced). Further, in the exhaust gas purification system described in Patent Document 1, work is prioritized over manual regeneration, and manual regeneration is interrupted to enable the work. However, the interrupted manual regeneration process is performed after the end of the operation. Since the work must be started from the beginning, the burden on the driver of the work vehicle is great.

  If PM is deposited in the DPF until manual regeneration is necessary, the work efficiency is greatly reduced by manual regeneration. Therefore, automatic regeneration that can avoid this is a very effective means. Recent internal combustion engine control devices incorporate both the manual regeneration and automatic regeneration functions described above, and the automatic regeneration reduces the frequency of manual regeneration and suppresses the reduction in work efficiency. . However, when automatic regeneration is executed, the minimum number of revolutions of the internal combustion engine is automatically raised (idle revolution number UP) regardless of the operator's intention, so the revolution number of the internal combustion engine must be made very low. Work that cannot be performed (the “partial work” described above, hereinafter referred to as “low-load work”) cannot be executed. For example, when the work vehicle is a power shovel, it is not possible to perform a tip blade replacement operation or the like that is performed while finely adjusting the hydraulic pressure by setting the rotational speed of the internal combustion engine to a very low rotational speed. When automatic regeneration is performed, workers can perform work except low-load work, but low-load work cannot be performed until automatic regeneration is completed, resulting in reduced work efficiency There is.

  As in Patent Document 1, it is conceivable to prepare a means for interrupting automatic regeneration according to the intention of the operator. However, when the worker cannot perform low-load work, the automatic regeneration must be interrupted one by one. It takes time and effort. In the first place, since automatic regeneration has not been started by the operator's intention, it is difficult to realize that automatic regeneration is the reason why the operator cannot perform low-load work.

  The present invention was devised in view of such points, and in an automatic regeneration process of a DPF that collects particulate matter in exhaust gas of an internal combustion engine, an operator is not aware of automatic regeneration. An internal combustion engine that enables low-load work to be performed without hassle, achieves both automatic regeneration of the DPF that does not depend on the operator's intention and work performed by the worker's intention, and suppresses a decrease in work efficiency. It is an object of the present invention to provide a filter regeneration control system for an engine and a filter regeneration control method for an internal combustion engine.

  In order to solve the above problems, a filter regeneration control system and a filter regeneration control method for an internal combustion engine according to the present invention employ the following means. First, the first invention of the present invention operates an internal combustion engine, a hydraulic pump driven by the internal combustion engine, a working machine operated by hydraulic pressure by hydraulic oil discharged from the hydraulic pump, and operating the working machine In the exhaust gas from the internal combustion engine, a work machine operating unit that is operated in order to enable or disable the operation instruction from the work machine operating unit to be valid or invalid is included. A particulate collection filter that collects particulate matter that has been collected, a deposition amount detection unit that detects the amount of particulate matter deposited on the particle collection filter, and from the internal combustion engine to the particle collection filter A catalyst provided in an exhaust path, a target rotation instruction unit that instructs a target rotational speed of the internal combustion engine, and a temperature of the exhaust gas flowing into the particle collection filter is raised and collected in the particle collection filter The A regeneration processing execution unit that executes filter regeneration processing for burning and burning the particulate matter, and a control device that controls operations of the internal combustion engine and the regeneration processing execution unit, and the control device includes the filter A regeneration lower limit rotational speed preset as a lower limit rotational speed of the internal combustion engine during the regeneration process is stored. The control device starts execution of automatic regeneration when it is determined that the amount of particulate matter accumulated detected by the accumulation amount detection unit exceeds a regeneration start threshold, and during the execution of the automatic regeneration, the internal combustion engine When the internal combustion engine is controlled in a filter regeneration combustion mode in which the temperature of exhaust gas discharged from the engine is raised, and the indicated target rotational speed instructed by the target rotational instruction section is equal to or higher than the regeneration lower limit rotational speed , Controlling the rotational speed of the internal combustion engine to the designated target rotational speed, and when the designated target rotational speed is less than the lower limit rotational speed for regeneration, the rotational speed of the internal combustion engine depends on the state of the operation lock unit The regeneration process execution unit is controlled so that the filter regeneration process is executed according to the temperature of the catalyst. A filter regeneration control system for an internal combustion engine.

  Next, a second aspect of the present invention is a filter regeneration control system for an internal combustion engine according to the first aspect, wherein the control device is configured such that the indicated target rotational speed is the value during execution of the automatic regeneration. When it is less than the lower limit rotational speed for regeneration, when the operation lock unit is in a state of invalidating the operation instruction from the work implement operating unit, the lower limit rotational speed of the internal combustion engine as the lower limit rotational speed for regeneration, When the operation lock unit is in a state in which an operation instruction from the work implement operation unit is valid, the internal combustion engine filter regeneration control system sets the lower limit rotation speed of the internal combustion engine as the specified target rotation speed.

  Next, a third aspect of the present invention is a filter regeneration control system for an internal combustion engine according to the first aspect or the second aspect of the present invention, wherein the regeneration processing execution unit is configured to connect the internal combustion engine to the catalyst. A fuel addition valve is provided in the exhaust path. When the control device detects that the temperature of the catalyst is equal to or higher than the catalyst activation temperature during the execution of the automatic regeneration, the control device injects fuel into the exhaust gas flowing through the exhaust path. An internal combustion engine filter regeneration control system that controls the fuel addition valve so as to stop fuel injection when the fuel addition valve is controlled to detect that the temperature of the catalyst is lower than the catalyst activation temperature. It is.

  Next, a fourth aspect of the present invention is a filter regeneration control method for an internal combustion engine, wherein the internal combustion engine, a hydraulic pump driven by the internal combustion engine, and hydraulic pressure discharged from the hydraulic pump is used. A work machine that is operated, a work machine operation unit that is operated to operate the work machine, and an operation lock unit that can be switched between enabling and disabling operation instructions from the work machine operation unit. A particle collection filter that collects particulate matter contained in exhaust gas from the internal combustion engine, and a deposition amount detection unit that detects the amount of particulate matter deposited on the particle collection filter; A catalyst provided in an exhaust path from the internal combustion engine to the particle collection filter, a target rotation instruction unit for instructing a target rotation speed of the internal combustion engine, and a temperature of the exhaust gas flowing into the particle collection filter A regeneration processing execution unit that executes a filter regeneration process for burning and incinerating particulate matter collected by the particle collection filter and a control device that controls operations of the internal combustion engine and the regeneration process execution unit; The control device stores a regeneration lower limit rotational speed that is preset as a lower limit rotational speed of the internal combustion engine during the execution of the filter regeneration processing. Then, when the accumulation amount of the particulate matter detected by the accumulation amount detection unit exceeds the regeneration start threshold, the control device is used to increase the temperature of the exhaust gas discharged from the internal combustion engine. Using the combustion mode changing step for controlling the internal combustion engine in a combustion mode and the control device, when the indicated target rotational speed instructed from the target rotational instruction section is equal to or greater than the regeneration lower limit rotational speed, When the rotational speed of the internal combustion engine is controlled to the indicated target rotational speed, and the directed target rotational speed is less than the lower limit rotational speed for regeneration, the rotational speed of the internal combustion engine is set according to the state of the operation lock unit, The rotation speed switching step of switching to and controlling either the indicated target rotation speed or the regeneration lower limit rotation speed, and using the control device, the filter reactivation is performed according to the temperature of the catalyst. Process controls the playback processing execution section to execute, having a particulate matter combustion incineration step, a filter regeneration control method for an internal combustion engine.

  According to the first aspect of the present invention, the control device starts the automatic regeneration when the amount of the particulate matter accumulated exceeds the regeneration start threshold value. During the automatic regeneration, the control device starts the internal combustion engine in the filter regeneration combustion mode. Control. Then, during execution of automatic regeneration, the control device sets the rotational speed of the internal combustion engine to the operation lock unit when the commanded target rotational speed instructed from the target rotational instruction unit is less than a preset lower limit rotational speed for regeneration. Depending on the state, the instruction target rotation speed or the reproduction lower limit rotation speed is switched. Further, the control device controls the regeneration processing execution unit according to the temperature of the catalyst during execution of automatic regeneration. Accordingly, the operator can finely adjust the rotation speed of the internal combustion engine to a lower rotation speed than the preset lower limit rotation speed during execution of automatic regeneration. Even in the middle, it is possible to appropriately perform work (low-load work) that requires fine adjustment of the hydraulic pressure, such as replacement of the cutting edge tool of the work vehicle. Further, during the automatic regeneration, by controlling the regeneration processing execution unit according to the temperature of the catalyst, the combustion incineration of the particulate matter accumulated in the particle collection filter can be more appropriately executed. . This makes it possible for the operator to perform low-load work without having to worry about automatic regeneration, and achieves both automatic regeneration of the DPF that does not depend on the operator's intention and work that is performed by the operator's intention. Thus, it is possible to suppress a decrease in work efficiency.

  In the second aspect of the invention, when the target target rotational speed is less than the regeneration lower limit rotational speed during execution of automatic regeneration, the internal combustion engine is in a state where the operation lock unit is in a state of invalidating the operation instruction of the work implement. Is set as the lower limit rotational speed for reproduction. Further, during execution of automatic regeneration, when the target target rotational speed is less than the lower limit rotational speed for regeneration, the lower limit rotational speed of the internal combustion engine is set when the operation lock unit is in a state where the operation instruction of the work implement is valid. Use the indicated target speed. Therefore, even when automatic regeneration is being executed, the operation lock unit is in a state in which the operation instruction of the work implement is made valid, so that the lower limit rotational speed of the internal combustion engine is lower than the lower limit rotational speed for regeneration. It can be a number. As a result, the operator can perform a low-load operation without being conscious of automatic regeneration, and the automatic regeneration of the DPF that is not based on the operator's intention and the operation that is based on the operator's intention are performed. Both can be achieved.

  According to the third aspect of the present invention, during the automatic regeneration, the catalyst temperature is lowered and the catalyst is not activated because the lower limit rotational speed of the internal combustion engine is set to be lower than the lower limit rotational speed for regeneration. Below, fuel injection from the addition valve is stopped, and fuel is injected from the addition valve when the catalyst is activated. Therefore, it is possible to appropriately perform combustion incineration (filter regeneration processing) of the particulate matter in the filter according to the active state of the catalyst.

  According to the fourth invention, similar to the first invention, it is possible for the operator to perform low-load work without any trouble without being aware of automatic regeneration, and automatic regeneration of the DPF not depending on the intention of the operator. In addition, it is possible to provide a filter regeneration control method for an internal combustion engine that can balance the work performed by the operator's intention and suppress a decrease in work efficiency.

It is a figure explaining the example of the external appearance of a work vehicle. It is a figure explaining the schematic structure of the work vehicle control system to which the control method of the internal combustion engine of the present invention is applied. It is a flowchart explaining the example of the process sequence of execution of a filter reproduction | regeneration process, and the setting of a minimum rotation speed. It is a flowchart explaining the example of the process at the time of filter regeneration combustion mode. FIG. 6 is a conceptual diagram of the operating region of the internal combustion engine in each case in the rotational speed / shaft torque characteristics (of the internal combustion engine).

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.
● [Appearance of work vehicle 80 (FIG. 1)]
Hereinafter, the power shovel shown in FIG. 1 will be described as an example of a work vehicle (a work vehicle including a construction machine and an industrial vehicle). The work vehicle 80 includes a lower traveling body 81 having a crawler, an upper turning body 82, a boom 83, an arm 84, a bucket 85, and the like.

  The crawler of the lower traveling body 81 and the upper turning body 82 are operated by power from a hydraulic motor (not shown). The boom 83 is operated by the hydraulic cylinder 83C, the arm 84 is operated by the hydraulic cylinder 84C, and the bucket 85 is operated by the hydraulic cylinder 85C. The operator operates a work machine operation unit provided in the cockpit to travel using the crawler of the lower traveling body 81, rotate the upper revolving body 82, boom 83, arm 84, and bucket 85. Can be operated. The crawler, the upper swing body 82, the boom 83, the arm 84, and the bucket 85 that are operated by hydraulic pressure correspond to a working machine.

● [Work vehicle control system configuration (Fig. 2)]
FIG. 2 shows a configuration of a work vehicle control system that controls work vehicle 80 shown in FIG. The control method for an internal combustion engine of the present invention is applied to the work vehicle control system. In the description of the present embodiment, a hybrid-type work vehicle control system that drives the hydraulic pump 31 using the diesel engine 11 (corresponding to an internal combustion engine) and the electric motor 21 will be described as an example. A work vehicle control system that omits and drives the hydraulic pump 31 only by the diesel engine 11 may be used.

  In the example of the present embodiment, the diesel engine 11 is controlled by the engine controller 10 (corresponding to the control device), the electric motor 21 is controlled by the motor controller 20 (corresponding to the control device), and the hydraulic pump 31 is The example controlled by the body controller 30 (equivalent to a control apparatus) is shown. In this example, the control device group is configured by three control devices (the engine controller 10, the motor controller 20, and the body controller 30), but the control device group may be configured by one control device, or 2 The control device group may be configured by one or four or more control devices. The body controller 30 and the engine controller 10 can transmit and receive various information via the communication line T13, and the body controller 30 and the motor controller 20 can transmit and receive various information via the communication line T23.

  In the work vehicle control system shown in FIG. 2, the rotor 21 </ b> C of the electric motor 21 is connected to the crankshaft 11 </ b> C of the diesel engine 11, and the rotor 31 </ b> C of the hydraulic pump 31 is connected to the rotor 21 </ b> C of the electric motor 21. The hydraulic pump 31 uses at least one of the diesel engine 11 and the electric motor 21 as a power source, sucks the hydraulic oil in the tank 32 through the pipe 33, and discharges the hydraulic oil to the pipe 34.

  A hydraulic motor 51 (drives the crawler and the upper swing body), hydraulic cylinders 83C, 84C, 85C, and the like are connected to the pipe 34 via the work machine operation unit 50. A relief valve 36 is connected to the pipe 34. The relief valve 36 is connected to the tank 32 via a pipe 37. When the relief valve 36 is in a closed state, the hydraulic oil in the pipe 34 is supplied to the hydraulic motor 51, the hydraulic cylinders 83C, 84C, 85C and the like via the work machine operation unit 50. When the relief valve 36 is in the open state, the hydraulic oil in the pipe 34 is returned to the tank 32 via the relief valve 36 and the pipe 37 without going through the work machine operation unit 50. The operator can switch the relief valve 36 between the open state and the closed state by operating the operation lock portion 41. The operation lock unit 41 validates the operation from the work machine operation unit 50 used when the operator operates the work machine (sets the relief valve 36 in a closed state) or invalidates the operation (relief of the relief valve 36). Can be switched).

  The diesel engine 11 is connected to an intake path composed of an intake pipe 11A and an intake manifold 11B, and is connected to an exhaust path composed of an exhaust manifold 11E and an exhaust pipe 11F. A throttle device 18 is provided in the intake path. The engine controller 10 can control the throttle device 18 to adjust the amount of air taken in by the diesel engine 11. Although not shown in the figure, a turbocharger having a variable nozzle, an EGR pipe for returning a part of the exhaust gas to the downstream side of the throttle device 18, an EGR valve, and the like are also provided. The engine controller 10 can control the turbocharger variable nozzle to adjust the boost pressure of intake air, and can control the EGR valve to adjust the EGR amount.

  Although not shown, each cylinder of the diesel engine 11 is provided with an injector for injecting fuel. The injector supplies an appropriate amount of fuel to each cylinder at an appropriate timing based on a drive signal from the engine controller 10. The diesel engine 11 includes a crank rotation detection unit (rotation sensor) that outputs a detection signal corresponding to the rotation of the crankshaft 11C, and a cylinder detection unit that outputs a cylinder determination signal indicating that a specific cylinder is in the compression process ( Various detection means (sensors) such as a cylinder discrimination sensor) and a cooling water temperature detection means (water temperature sensor) are attached, and description and explanation thereof are omitted.

  In the exhaust path, a fuel addition valve 15, exhaust temperature detection means 16A, 16B, 16C, catalyst 12, particle collection filter 13, differential pressure detection means 17, A / F detection means 14, and the like are provided. The catalyst 12 and the particle collection filter 13 may be integrated as a filter unit without being configured separately. For example, the catalyst 12, the particle collection filter 13, and the exhaust temperature detection means 16A, 16B, 16C. The differential pressure detection means 17 may be assembled so as to be integrated in one case. The fuel addition valve 15 (corresponding to the regeneration processing execution unit) is provided on the upstream side of the catalyst 12 (and the particle collection filter 13), and burns the particulate matter collected in the particle collection filter 13. When incinerated, the engine controller 10 controls and injects fuel into the exhaust path. The fuel injected from the fuel addition valve 15 is used for combustion (oxidation) in the activated catalyst 12 (oxidation catalyst or the like), and the exhaust gas is heated to a high temperature by the reaction heat (oxidation reaction heat) of the catalyst 12. Is introduced into the particle collection filter 13, and the particulate matter deposited in the particle collection filter 13 is burned and incinerated by the exhaust gas. The exhaust temperature detection means 16A, 16B, and 16C are, for example, exhaust temperature sensors. The exhaust temperature detection means 16A is provided on the upstream side of the catalyst 12 (inlet part of the catalyst 12), and the exhaust temperature detection means 16B includes the catalyst 12 and particles. The exhaust gas temperature detection means 16C is provided downstream of the particle collection filter 13 (the outlet of the particle collection filter 13) (provided at the outlet of the catalyst 12 or the inlet of the particle collection filter 13). Part). The engine controller 10 can know the temperature of the exhaust gas at each position in the exhaust path based on the detection signals from the exhaust temperature detection means 16A, 16B, 16C. Note that the number of exhaust temperature detection means and the positions to be provided are not limited to the numbers and positions shown in the example of FIG. The A / F detection means 14 is an A / F sensor, for example, and outputs a detection signal related to the air-fuel ratio of the exhaust gas. The engine controller 10 knows the air-fuel ratio based on the detection signal from the A / F detection means 14, and adjusts the fuel injection amount from the injector based on the air-fuel ratio.

  The catalyst 12 purifies predetermined components (for example, CO (carbon monoxide), HC (hydrocarbon)) in the exhaust gas and renders them harmless. The particle collection filter 13 is a DPF (Diesel Particulate Filter) and collects particulate matter contained in the exhaust gas. The differential pressure detection means 17 (corresponding to the accumulation amount detection unit) is, for example, a differential pressure sensor, and is connected to the upstream side and the downstream side of the particle collection filter 13. The engine controller 10 can know the differential pressure between the upstream pressure and the downstream pressure of the particle collection filter 13 based on the detection signal from the differential pressure detection means 17. The amount of particulate matter collected (deposited) can be estimated.

  The engine controller 10 includes a CPU and a storage device such as a memory. In addition to the detection signals from the exhaust temperature detection means 16A, 16B, 16C, the differential pressure detection means 17, the crank rotation detection means, and the cylinder detection means, the engine controller 10 receives various detection means (not shown). Detection signal is input. The engine controller 10 outputs drive signals for driving various actuators (not shown) in addition to the throttle device 18, the fuel addition valve 15, and the injector described above. Further, the engine controller 10 controls the diesel engine 11 based on the requested torque information (engine target rotation) received from the machine controller 30 via the communication line T13.

  The motor controller 20 has a storage device such as a CPU and a memory. The motor controller 20 detects the rotation state of the rotor 21C based on the detection signal from the rotor rotation detection means (rotor rotation sensor or the like) that detects the rotation state of the rotor 21C of the electric motor 21, and sets the detected rotation state. Based on this, the current to each coil of the stator is controlled. The motor controller 20 controls the electric motor 21 based on the requested torque information (motor target rotation) received from the machine controller 30 via the communication line T23.

  The machine controller 30 has a CPU and a storage device such as a memory. The body controller 30 receives detection signals from an operation lock unit 41, an engine control dial 42 (corresponding to a target rotation instruction unit), a regeneration prohibiting unit 43, a manual regeneration executing unit 44, and the like, and a hydraulic pump 31 (not shown). The hydraulic load detection signal from is input. The operation lock unit 41 switches the relief valve 36 between an open state and a closed state by an operation from the operator. The engine control dial 42 outputs a detection signal based on the target rotational speed of the diesel engine 11 instructed by the operator to the machine controller 30. The regeneration prohibiting means 43 is a regeneration prohibiting switch for prohibiting the execution of the filter regeneration processing, for example. When the operator operates the regeneration prohibiting means 43 (when the regeneration prohibiting switch is turned ON), the execution of the filter regeneration processing is prohibited. Is done. The manual regeneration execution means 44 is a manual regeneration execution switch for instructing execution of manual regeneration in the filter regeneration processing, for example, and when the operator operates the manual regeneration execution means (when the manual regeneration execution switch is turned on), the filter Manual regeneration of regeneration processing is executed. The airframe controller 30 obtains the required torque for the diesel engine 11 and the electric motor 21 based on each input described above, transmits the required torque information (engine target rotation) to the engine controller 10 via the communication line T12, and performs communication. Requested torque information (motor target rotation) is transmitted to the motor controller 20 via the line T23.

● [Processing procedure of control device (engine controller and machine controller) (Figs. 3 and 4)]
Next, processing of the control device (the engine controller 10 and the machine controller 30) will be described using the flowcharts shown in FIGS. Note that manual regeneration is the same as that in the prior art, and thus description thereof is omitted. In the following description, the terms “filter regeneration process” and “automatic regeneration” are used as “filter regeneration process = combustion incineration of particulate matter”, “automatic regeneration = change of combustion mode + change of lower limit rotational speed + filter regeneration”. It is used to mean “processing”.

  First, the processing of the engine controller shown in FIG. 3 will be described. The engine controller 10 starts the process of the engine controller shown in FIG. 3 at a predetermined timing such as a predetermined time interval (for example, every several tens [ms]), and proceeds to step S110.

  In step S110, the engine controller 10 estimates the PM accumulation amount (particulate matter accumulation amount) in the particle collection filter, and proceeds to step S115. For example, the engine controller 10 estimates the PM accumulation amount based on the differential pressure detected using the differential pressure detection means 17 (corresponding to the accumulation amount detection unit).

  In step S115, the engine controller 10 determines whether or not the estimated PM accumulation amount exceeds a regeneration start threshold value (deposition amount at which automatic regeneration is to be started). If the regeneration start threshold value is exceeded (Yes), step S115 is performed. The process proceeds to S120, and if the reproduction start threshold is not exceeded (No), the process proceeds to Step S190. The regeneration start threshold value is stored in advance in the storage device of the engine controller 10.

  When the process proceeds to step S120, the engine controller 10 determines whether or not the regeneration prohibiting means 43 operated by the operator is ON, and the regeneration prohibiting means 43 is ON (inhibition of filter regeneration processing is instructed. ) (Yes), the process proceeds to step S180, and when the regeneration prohibiting means 43 is OFF (permission of filter regeneration processing is instructed) (No), the process proceeds to step S130. Note that the ON or OFF state of the regeneration prohibiting means 43 is appropriately received from the machine controller 30 via the communication line T13.

  The processes of steps S130 to S150A and S150B and steps S310 to S340 and S420A described later are automatic reproduction processes. When the process proceeds to step S130, the engine controller 10 sets the regeneration combustion mode flag to ON and proceeds to step S135. Note that the regeneration combustion mode flag is a flag used in the processing shown in FIG. 4 described later, and in order to activate the catalyst 12 as the filter regeneration combustion mode during the automatic regeneration, This is a flag used to intentionally increase the combustion temperature.

  In step S135, the engine controller 10 transmits the regeneration lower limit rotational speed to the machine controller 30 via the communication line T13, and the process proceeds to step S140. The regeneration lower limit rotational speed is stored in advance in the storage device of the engine controller 10 as the lower limit rotational speed of the internal combustion engine during execution of automatic regeneration. The engine controller 10 reads the reproduction lower limit rotational speed (for example, 500 [rpm]) stored in advance in the storage device, and transmits the reproduction lower limit rotational speed to the machine controller 30.

  Next, processing of the machine controller shown in FIG. 3 will be described. The machine controller 30 activates the process of the machine controller shown in FIG. 3 at the timing when information is received from the engine controller 10 via the communication line T13, for example, and proceeds to step S310.

  In step S310, body controller 30 receives the lower limit rotational speed for regeneration from engine controller 10, and proceeds to step S315.

  In step S315, the body controller 30 acquires the indicated target rotational speed (the rotational speed of the internal combustion engine desired by the worker) designated from the engine control dial 42 operated by the worker, and proceeds to step S320.

  In step S320, body controller 30 determines whether or not the designated target rotational speed is less than the lower limit rotational speed for reproduction. If the designated target rotational speed is less than the lower rotational speed for reproduction (Yes), step S325 is performed. If the instruction target rotational speed is equal to or higher than the reproduction lower limit rotational speed (No), the process proceeds to step S330A.

  When the process proceeds to step S325, the body controller 30 determines whether or not the operation lock unit 41 operated by the worker is in a state of invalidating the operation instruction from the work unit operating unit operated by the worker. If the operation instruction is invalidated (Yes), the process proceeds to step S330B. If the operation instruction is valid (No), the process proceeds to step S330C. When the automatic regeneration is being executed, the processing of step S325 is performed when the indicated target rotational speed, which is the target rotational speed instructed from the engine control dial (target rotational instruction section), is less than the lower limit rotational speed for regeneration. This corresponds to a rotation speed switching step of switching the rotation speed to either the designated target rotation speed or the reproduction lower limit rotation speed in accordance with the state of the operation lock unit.

  When the process proceeds to step S330A, the body controller 30 sets the lower limit rotational speed to the lower limit rotational speed for reproduction (substitutes the lower limit rotational speed for reproduction into the lower limit rotational speed), and proceeds to step S340.

  When the process proceeds to step S330B, body controller 30 sets the lower limit rotational speed to the lower limit rotational speed for reproduction (substitutes the lower limit rotational speed for reproduction into the lower limit rotational speed), and proceeds to step S340. Step S330B is when the operation lock unit is in a state of invalidating the operation instruction (from the work machine operation unit) when the instruction target rotation speed is less than the lower limit rotation speed for reproduction during execution of automatic regeneration. The lower limit rotational speed is switched to the lower limit rotational speed for reproduction.

  When the process proceeds to step S330C, body controller 30 sets the lower limit rotation speed to the command target rotation speed (substitutes the command target rotation speed for the lower limit rotation speed), and proceeds to step S340. Step S330C is when the operation lock unit is in a state of validating the operation instruction (from the work implement operation unit) when the instruction target rotation speed is less than the lower limit rotation speed for reproduction during execution of automatic regeneration. The lower limit rotational speed is switched to the indicated target rotational speed, which is a feature of the present application.

  In step S340, body controller 30 transmits the lower limit rotational speed to engine controller 10 and ends the process.

  In step S140, the engine controller receives the lower limit rotational speed from the body controller 30, and proceeds to step S145. The engine controller 10 controls the rotational speed of the internal combustion engine during execution of automatic regeneration based on the received lower limit rotational speed. The engine controller 10 controls the rotational speed of the internal combustion engine so as to be the indicated target rotational speed when the designated target rotational speed instructed from the engine control dial 42 is equal to or higher than the lower limit rotational speed during execution of the automatic regeneration. When the command target rotational speed is lower than the lower limit rotational speed, the rotational speed of the internal combustion engine is controlled to be the lower limit rotational speed.

  In step S145, the engine controller 10 estimates the temperature of the catalyst 12 based on detection signals from the exhaust temperature detection means 16A, 16B, 16C, and the estimated catalyst temperature is equal to or higher than a preset catalyst activation temperature. If the temperature is equal to or higher than the catalyst activation temperature (Yes), the process proceeds to step S150A. If the temperature is lower than the catalyst activation temperature (No), the process proceeds to step S150B. The catalyst activation temperature is stored in advance in the storage device of the engine controller 10.

  When the process proceeds to step S150A, the engine controller 10 controls the fuel addition valve 15 (corresponding to the regeneration process execution unit) to burn and incinerate particulate matter accumulated in the particle collection filter (filter regeneration process). A predetermined amount of fuel necessary for the injection is injected, and the process is terminated. Since the regeneration combustion mode flag is set to ON in step S130, steps S150A and 150B are performed when the combustion mode changing step (step S420A described later) is being executed (during automatic regeneration). Will be executed.

  When the process proceeds to step S150B, the engine controller 10 stops the fuel injection from the fuel addition valve 15 and ends the process. When the lower limit rotational speed is less than the regeneration lower limit rotational speed, the exhaust gas flow rate may be insufficient and the catalyst temperature may not reach the activation temperature. When the temperature of the catalyst does not reach the activation temperature, a sufficient oxidation reaction cannot be performed with the catalyst. Therefore, when the catalyst is activated by the processing of steps S145, S150A, and S150B, the fuel is appropriately Fuel is injected from the addition valve. Further, the processes of steps S145 and S150B are not “interruption” but “temporary hold” of automatic regeneration. If the catalyst temperature becomes equal to or higher than the catalyst activation temperature, fuel injection from the fuel addition valve is immediately performed. (That is, combustion incineration of particulate matter in the particle collection filter) can be resumed. The processing in steps S145, S150A, and S150B controls the fuel addition valve (corresponding to the regeneration processing execution unit) so that the filter regeneration processing (combustion incineration of particulate matter) is performed according to the temperature of the catalyst. This corresponds to the incineration step.

  When the process proceeds to step S180, the engine controller 10 executes a process when the regeneration prohibiting unit is ON (it is an existing process and description thereof is omitted), and the process proceeds to step S190.

  When the routine proceeds to step S190, the engine controller 10 turns off the regeneration combustion mode flag and ends the process.

  Next, the process of the engine controller shown in FIG. 4 will be described. The engine controller 10 starts the process of the engine controller shown in FIG. 4 at a predetermined timing such as a predetermined time interval (for example, every several tens [ms]), and proceeds to step S410.

  In step S410, the engine controller 10 determines whether or not the regeneration combustion mode flag is ON. If the regeneration combustion mode flag is ON (Yes), the process proceeds to step S420A, where the regeneration combustion mode flag is set. If it is OFF (No), the process proceeds to step S420B.

  When the process proceeds to step S420A, the engine controller 10 executes the filter regeneration combustion mode process and ends the process. The engine controller 10 raises the combustion temperature of the internal combustion engine and raises the temperature of the exhaust gas in order to activate the catalyst 12 when burning the particulate matter accumulated in the particle collection filter. Specifically, the engine controller 10 throttles the throttle device 18 slightly to reduce the intake air amount. Alternatively, the engine controller 10 increases the injection amount by slightly delaying the injection timing of fuel injection from the injector that injects fuel into each cylinder of the diesel engine 11 (retarding the timing of main injection). Thereby, the combustion temperature of the diesel engine 11 can be raised. The process of step S420A corresponds to a combustion mode changing step of controlling the internal combustion engine in a filter regeneration combustion mode that raises the combustion temperature of the internal combustion engine during execution of automatic regeneration.

  When the process proceeds to step S420B, the engine controller 10 executes the process in the normal mode and ends the process. Specifically, the process in the normal mode is not to perform the process performed in step S420A. The engine controller 10 returns the opening degree to the normal time (when not in the filter regeneration combustion mode) without performing the process of reducing the throttle device 18, and the main injection timing and the injection amount are both normal (when not in the filter regeneration combustion mode). ) To return to the main injection timing and injection amount.

● [Effect of this application (Fig. 5)]
FIG. 5 shows the characteristics (rotation speed / shaft torque characteristics) of the operating region (usage region) of the internal combustion engine in “when the operation lock portion = the operation is“ valid ”and when automatic regeneration is being performed”. Shows an example of the characteristics (rotation speed / shaft torque characteristics) of the operating region (use region) of the internal combustion engine in the case of “operation lock unit = when the operation is set to“ invalid ”and automatic regeneration is being executed” . Region A shows a medium / high load region where the rotational speed of the internal combustion engine is equal to or higher than the lower limit rotational speed for regeneration, and region C is a low load where the rotational speed of the internal combustion engine is equal to or higher than the low idle rotational speed and lower than the lower limit rotational speed for regeneration. Indicates the area. In addition, since the figure of “operation lock unit = when the operation is set to“ invalid ”and when automatic reproduction is being performed” is the state where the operation is “invalid” and the operator does not intend to work, The example of the characteristic at the time of leaving in an idle state is shown.

  In the case where automatic regeneration (and manual regeneration) is not performed, when the operation lock unit is in a state in which the operation is enabled and the work machine is not specifically instructed to work, the rotational speed of the internal combustion engine is 5 is maintained at the “low idle speed” shown in the upper diagram of FIG. When the automatic regeneration is being performed and the operation lock unit is in a state in which the operation is invalidated, the rotational speed of the internal combustion engine is changed from “low idle rotational speed” to “ Increased to “reduction lower limit speed”. The lower limit rotational speed for regeneration is set to a rotational speed that can secure the flow rate of exhaust gas necessary for burning and incinerating particulate matter accumulated in the particle collection filter. Then, by securing the flow rate of the exhaust gas and changing the combustion mode (shifting to the filter regeneration combustion mode and raising the temperature of the exhaust gas), the temperature of the catalyst can be raised to activate the catalyst. it can. When the catalyst is activated, as described above, the fuel is injected from the fuel addition valve so that the fuel is combusted (oxidized) in the catalyst, and the exhaust gas heated to high temperature by the reaction heat is introduced into the particle collecting filter. Then, the particulate matter accumulated in the particle collecting filter can be burned and incinerated.

  Further, when the operation is performed in the region A in the upper diagram of FIG. 5, the flow rate of the exhaust gas discharged from the internal combustion engine is a flow rate sufficient to activate the catalyst, and the combustion mode for filter regeneration Thus, the catalyst can be easily activated (heated to a temperature higher than the catalyst activation temperature). If the catalyst is activated, as described above, the particulate matter accumulated in the particle collecting filter can be incinerated by injecting fuel from the fuel addition valve. Further, in the case where the operation is performed in the region C in the upper diagram of FIG. 5, the flow rate of the exhaust gas discharged from the internal combustion engine is insufficient to activate the catalyst. If the flow rate of the exhaust gas is insufficient, the catalyst temperature may be lowered and not activated even when the combustion mode for filter regeneration is entered. When the catalyst is not activated, as described above, the injection of fuel from the fuel addition valve is stopped, and the filter regeneration process (combustion incineration of particulate matter) is temporarily suspended while maintaining automatic regeneration. .

  Further, in the state shown in the lower diagram of FIG. 5, since the operation lock unit is in a state in which the operation is invalidated, it is detected by the control device that the operator does not intend to work. Therefore, even if the engine control dial indicates a rotational speed less than the regeneration lower limit rotational speed, the idle speed of the internal combustion engine is raised to the regeneration lower limit rotational speed by the control device. For this reason, the flow rate of the exhaust gas discharged from the internal combustion engine is a flow rate sufficient to activate the catalyst, and the catalyst can be easily activated (at or above the catalyst activation temperature by setting the combustion mode for filter regeneration). Temperature). If the catalyst is activated, as described above, the particulate matter accumulated in the particle collecting filter can be incinerated by injecting fuel from the fuel addition valve.

  Since the filter regeneration process by automatic regeneration is a process that takes a relatively long time, during execution of this automatic regeneration, the operator can use the cutting edge tool of the work machine (in the case of the work vehicle in FIG. 1, the bucket 85 corresponds). May be desired. In order to replace the tip cutter, an operation from the work implement operation unit is required, and therefore the operation lock unit must be in a state in which an operation instruction from the work implement operation unit is valid.

  In order to replace the tip blade, etc., it is necessary to finely adjust the hydraulic pressure by setting the rotational speed of the internal combustion engine to a rotational speed lower than the normal idle rotational speed. When the operator sets the operation lock unit to the state in which the operation is enabled, as shown in the upper diagram of FIG. 5, the area C can be used even during the automatic reproduction. The operator does not need to perform any special operation and only operates the engine control dial to lower the indicated target rotational speed, thereby moving the operating area of the internal combustion engine to the area C, and performing low-load work such as replacement of the cutting edge tool. It can be performed. Thereby, the process of automatic regeneration of the particle collection filter not depending on the operator's intention and the operation based on the operator's intention can be made compatible, and a decrease in work efficiency can be suppressed. Conventionally, since the rotational speed of the internal combustion engine could not be made lower than the lower limit rotational speed for regeneration during execution of automatic regeneration, the area C could not be used during execution of automatic regeneration.

  Note that when the speed of the internal combustion engine is made lower than the regeneration lower limit speed during execution of automatic regeneration (when the region C in the upper diagram of FIG. 5 is used), the exhaust gas flow rate decreases and the catalyst temperature decreases. The catalyst may become inactive. If the catalyst is not in the activated state, combustion incineration of particulate matter in the particle collection filter may not proceed as expected. Therefore, in the present application, when the catalyst temperature becomes lower than the catalyst activation temperature during execution of the automatic regeneration, the fuel injection from the fuel addition valve is stopped and the filter regeneration process (combustion incineration of particulate matter) is temporarily performed. When the catalyst temperature becomes equal to or higher than the catalyst activation temperature, fuel injection from the fuel addition valve is executed and the filter regeneration process is immediately resumed.

  The internal combustion engine filter regeneration control system and internal combustion engine filter regeneration control method of the present invention are not limited to the configuration, processing procedure, and the like described in the present embodiment, and various modifications are possible without departing from the scope of the present invention. It can be changed, added and deleted.

  The internal combustion engine filter regeneration control system and internal combustion engine filter regeneration control method described in the present embodiment can be applied to various work vehicles including construction machines and industrial vehicles.

  In the description of the present embodiment, the differential pressure detection unit is used as an example of the accumulation amount detection unit, but the accumulation amount detection unit is not limited to the differential pressure detection unit.

  Further, the above (≧), the following (≦), the greater (>), the less (<), etc. may or may not include an equal sign. The numerical values used in the description of the present embodiment are examples, and are not limited to these numerical values.

10 Engine controller (control device)
11 Diesel engine (internal combustion engine)
11A Intake piping 11B Intake manifold 11E Exhaust manifold 11F Exhaust piping 12 Catalyst 13 Particle collection filter 14 A / F detection means 15 Fuel addition valve (regeneration processing execution section)
16A, 16B, 16C Exhaust temperature detection means 17 Differential pressure detection means (deposition amount detection part)
18 Throttle device 20 Motor controller (control device)
21 Electric motor 30 Airframe controller (control device)
31 Hydraulic pump 32 Tank 36 Relief valve 41 Operation lock part 42 Engine control dial (target rotation instruction part)
43 Reproduction prohibition means (automatic regeneration prohibition switch)
44 Manual regeneration execution means 50 Work implement operation unit 51 Hydraulic motor 80 Work vehicle 81 Lower traveling body 82 Upper turning body 83 Boom 83C, 84C, 85C Hydraulic cylinder 84 Arm 85 Bucket (tip blade)
T13, T23 Communication line

Claims (4)

An internal combustion engine;
A hydraulic pump driven by the internal combustion engine;
A working machine operated by hydraulic pressure from hydraulic oil discharged from the hydraulic pump;
A work implement operating unit operated to operate the work implement;
Whether to enable or disable the operation instruction from the work machine operation unit, an operation lock unit that can be switched, and
A particle collection filter for collecting particulate matter contained in exhaust gas from the internal combustion engine;
A deposition amount detector for detecting the amount of particulate matter deposited on the particle collection filter;
A catalyst provided in an exhaust path from the internal combustion engine to the particle collection filter;
A target rotation instruction section for instructing a target rotation speed of the internal combustion engine;
A regeneration process execution unit for performing a filter regeneration process for increasing the temperature of the exhaust gas flowing into the particle collection filter and burning and incinerating the particulate matter collected by the particle collection filter;
A control device for controlling the operation of the internal combustion engine and the regeneration processing execution unit,
The control device stores a regeneration lower limit rotational speed that is preset as a lower limit rotational speed of the internal combustion engine during execution of the filter regeneration processing,
The control device starts execution of automatic regeneration when it is determined that the accumulation amount of the particulate matter detected by the accumulation amount detection unit exceeds a regeneration start threshold, and during execution of the automatic regeneration,
Controlling the internal combustion engine in a filter regeneration combustion mode for increasing the temperature of exhaust gas discharged from the internal combustion engine;
When the command target revolution number instructed from the target revolution instruction unit is equal to or greater than the regeneration lower limit revolution number, the engine control unit controls the revolution number of the internal combustion engine to the command target revolution number, and the command target revolution number is the regeneration target revolution number. When it is less than the lower limit rotational speed, the rotational speed of the internal combustion engine is controlled by switching to either the indicated target rotational speed or the regeneration lower limit rotational speed according to the state of the operation lock unit,
Controlling the regeneration process execution unit so that the filter regeneration process is performed according to the temperature of the catalyst;
A filter regeneration control system for an internal combustion engine. A filter regeneration control system for an internal combustion engine according to claim 1,
The control device, during execution of the automatic regeneration, when the instruction target rotational speed is less than the lower limit rotational speed for reproduction,
When the operation lock unit is in a state of invalidating the operation instruction from the work machine operation unit, the lower limit rotational speed of the internal combustion engine is set as the lower limit rotational speed for regeneration,
When the operation lock unit is in a state in which an operation instruction from the work implement operation unit is valid, a lower limit rotation speed of the internal combustion engine is set as the instruction target rotation speed.
A filter regeneration control system for an internal combustion engine. An internal combustion engine filter regeneration control system according to claim 1 or 2,
The regeneration processing execution unit has a fuel addition valve provided in an exhaust path from the internal combustion engine to the catalyst,
The control device, during execution of the automatic reproduction,
When it is detected that the temperature of the catalyst is equal to or higher than the catalyst activation temperature, the fuel addition valve is controlled to inject fuel into the exhaust gas flowing through the exhaust path,
When detecting that the temperature of the catalyst is lower than the catalyst activation temperature, the fuel addition valve is controlled to stop fuel injection;
A filter regeneration control system for an internal combustion engine. A filter regeneration control method for an internal combustion engine comprising:
An internal combustion engine;
A hydraulic pump driven by the internal combustion engine;
A working machine operated by hydraulic pressure from hydraulic oil discharged from the hydraulic pump;
A work implement operating unit operated to operate the work implement;
Whether to enable or disable the operation instruction from the work machine operation unit, an operation lock unit that can be switched, and
A particle collection filter for collecting particulate matter contained in exhaust gas from the internal combustion engine;
A deposition amount detector for detecting the amount of particulate matter deposited on the particle collection filter;
A catalyst provided in an exhaust path from the internal combustion engine to the particle collection filter;
A target rotation instruction section for instructing a target rotation speed of the internal combustion engine;
A regeneration process execution unit for performing a filter regeneration process for increasing the temperature of the exhaust gas flowing into the particle collection filter and burning and incinerating the particulate matter collected by the particle collection filter;
A control device for controlling the operation of the internal combustion engine and the regeneration processing execution unit,
The control device stores a regeneration lower limit rotational speed that is preset as a lower limit rotational speed of the internal combustion engine during execution of the filter regeneration processing,
When the accumulation amount of the particulate matter detected by the accumulation amount detection unit exceeds the regeneration start threshold,
A combustion mode changing step of controlling the internal combustion engine in a filter regeneration combustion mode for increasing the temperature of exhaust gas discharged from the internal combustion engine using the control device;
When the command target rotational speed instructed from the target rotational instruction unit is equal to or higher than the regeneration lower limit rotational speed using the control device, the rotational speed of the internal combustion engine is controlled to the designated target rotational speed, When the target rotational speed is less than the regeneration lower limit rotational speed, the rotational speed of the internal combustion engine is switched to either the indicated target rotational speed or the regeneration lower limit rotational speed according to the state of the operation lock unit. A rotation speed switching step controlled by
A particulate matter combustion incineration step for controlling the regeneration process execution unit so that the filter regeneration process is performed according to the temperature of the catalyst using the control device;
A filter regeneration control method for an internal combustion engine.

Images