Treatment device, treatment method, and exhaust gas treatment system

Abstract

To provide a processing device, a processing method and an exhaust gas treatment system capable of appropriately determining timing of filter cleaning.SOLUTION: A processing device includes: an acquisition section acquiring information indicating an estimation value of accumulation amount of ash accumulated in a filter collecting particulate matters in exhaust gas of an engine and information indicating atmospheric pressure; a calculation section calculating an allowed ash accumulation amount threshold value corresponding to allowed ash accumulation amount changing in accordance with the atmospheric pressure; a determination section determining that cleaning of the filter is necessary when the estimation value is the allowed ash accumulation amount threshold value or larger; and a reporting section that when the necessity of the cleaning of the filter is determined, reports the determination result.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a treatment device, a treatment method, and an exhaust gas treatment system. [Background technology]

[0002] Patent Document 1 describes an exhaust aftertreatment device that determines whether a specified amount of ash has accumulated on a filter that captures particulate matter (PM) contained in exhaust gas. Particulate matter includes soot, unburned fuel, ash (also called oil ash), etc. Ash is the scum of metal components such as calcium that are contained in engine oil as an additive. In the device described in Patent Document 1, when particulate matter accumulates on the filter, a regeneration operation is performed in which the filter is heated to an elevated temperature and the particulate matter accumulated on the filter is burned and removed. However, ash cannot be removed by the regeneration operation. In the device described in Patent Document 1, when the interval between regeneration operations becomes short, it is determined that a specified amount of ash has accumulated on the filter. Furthermore, in the device described in Patent Document 1, when it is determined that a specified amount of ash has accumulated, a warning is issued that the filter needs to be cleaned.

[0003] The device described in Patent Document 1 determines whether or not a regeneration operation is necessary as follows: That is, in the device described in Patent Document 1, it is determined that a regeneration operation is necessary when a value corresponding to the deposition amount based on the differential pressure between the upstream and downstream pressures of the filter, the exhaust flow rate, and the exhaust temperature reaches a predetermined value. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-138704 Summary of the Invention [Problem to be solved by the invention]

[0005] The device described in Patent Document 1 determines that filter cleaning is necessary when the interval between regeneration operations becomes shorter. However, the rate at which ash accumulates on the filter varies depending on how the vehicle is used. The interval between regeneration operations also varies depending on how the vehicle is used. Therefore, there is a problem in that, depending on how the vehicle is used, it may not be possible to appropriately determine the timing for filter cleaning.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a treatment device, a treatment method, and an exhaust gas treatment system that can appropriately determine the timing for cleaning a filter. [Means for solving the problem]

[0007] The processing device of the present disclosure includes an acquisition unit that acquires information indicating an estimated value of the amount of ash accumulated on a filter that captures particulate matter in engine exhaust and information indicating atmospheric pressure; a calculation unit that calculates an allowable ash accumulation amount threshold corresponding to the allowable ash accumulation amount that changes depending on the atmospheric pressure; a determination unit that determines that cleaning of the filter is necessary if the estimated value is equal to or greater than the allowable ash accumulation amount threshold; and a notification unit that notifies the user that cleaning of the filter is necessary when it is determined that cleaning of the filter is necessary. [Effects of the Invention]

[0008] According to the processing device, processing method, and exhaust gas processing system of the present disclosure, it is possible to appropriately determine the timing for cleaning the filter. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a system diagram illustrating a configuration example of an engine control system according to an embodiment of the present disclosure. [Figure 2] 2 is a block diagram showing an example of the configuration of a control device 100 shown in FIG. 1. FIG. [Figure 3] FIG. 3 is a schematic diagram for explaining a calculation unit 104 shown in FIG. 2. [Figure 4] FIG. 3 is a schematic diagram for explaining a calculation unit 104 shown in FIG. 2. [Figure 5] FIG. 3 is a schematic diagram for explaining a calculation unit 104 shown in FIG. 2. [Figure 6] FIG. 3 is a schematic diagram for explaining a calculation unit 104 shown in FIG. 2. [Figure 7] FIG. 3 is a schematic diagram for explaining a calculation unit 104 shown in FIG. 2. [Figure 8] 3 is a flowchart showing an example of the operation of the control device 100 shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding components are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

[0011] (Engine Control System 10) FIG. 1 is a system diagram showing an example configuration of an engine control system 10 as an example configuration of an exhaust gas treatment system according to an embodiment of the present disclosure. The engine control system 10 shown in FIG. 1 includes an engine 1, a turbocharger 2, an exhaust pipe 3, a DPF device 5 as an example configuration of an exhaust gas aftertreatment device, a monitor 8, an HC dozer 7, an atmospheric pressure sensor 98, and a control device 100. Note that FIG. 1 and other figures mainly show the configuration related to the DPF device 5 in the engine control system 10 (or the control device 100) of this embodiment, and appropriately omit illustration of configurations related to other functions such as fuel injection control. Furthermore, HC is a general term for organic compounds containing carbon and hydrogen.

[0012] The engine 1 is an example of an internal combustion engine, and in this embodiment is, for example, a multi-cylinder diesel engine. The turbocharger 2 is a supercharger that uses the exhaust gas of the engine 1 to compress the intake air of the engine 1. The exhaust pipe 3 discharges the exhaust gas of the engine 1 into the atmosphere through a DPF device 5.

[0013] The DPF device 5 is a device that purifies particulate matter contained in the exhaust gas of the engine 1, and includes a DOC (Diesel Oxidation Catalyst) 51 provided in the exhaust pipe 3 of the engine 1, and a DPF (Diesel Particulate Filter) 52 that is a filter that captures PM in the exhaust gas of the engine 1. The DPF device 5 regenerates the DPF 52 through the action of the DOC 51. The DPF device 5 oxidizes soot captured downstream of the DPF 52 to carbon dioxide using nitrogen dioxide converted by the DOC 51 provided upstream of the DPF 52, thereby removing the soot.

[0014] The DPF device 5 also has a DOC inlet temperature sensor 94 that detects the exhaust gas temperature at the inlet of the DOC 51, a DOC outlet temperature sensor 95 that detects the exhaust gas temperature at the outlet of the DOC 51, and a pair of pressure sensors 96 and 97 that detect the differential pressure between the inlet and outlet of the DPF 52. Hereinafter, this differential pressure between the inlet and outlet of the DPF 52 will also be referred to as the DPF differential pressure or DPF pressure loss. The detected values ​​of the DOC inlet temperature sensor 94, the DOC outlet temperature sensor 95, and the pressure sensors 96 and 97 are output to the control device 100.

[0015] The HC dozer 7 is an exhaust pipe fuel injection device that injects fuel (HC) into the exhaust pipe 3 (hereinafter referred to as HC dosing, etc.) upstream of the DOC 51. The HC dosing by the HC dozer 7 is controlled by the control device 100.

[0016] The monitor 8 has, for example, a display panel and an input panel, and functions as a display device and an input device, displaying predetermined characters and images in response to instructions from the control device 100, and outputting signals to the control device 100 in response to input operations by the user (operator).

[0017] The atmospheric pressure sensor 98 detects the atmospheric pressure and outputs the detected value to the control device 100 .

[0018] In the engine control system 10 of this embodiment, a regeneration operation (DPF regeneration operation) is periodically performed to combust PM accumulated in the DPF 52. During this regeneration operation, the temperature of the exhaust gas and the temperature of the DOC 51 are forcibly increased. The regeneration operation is performed, for example, by post-injection for mixing a small amount of fuel into the exhaust gas in the engine 1, or by a combination of post-injection and HC dosing by the HC dozer 7 into the exhaust pipe 3 upstream of the DPF device 5, or by HC dosing, thereby burning HC inside the DOC 51 arranged upstream of the DPF 52 and increasing the temperature of the DPF 52.

[0019] In the engine control system 10 of this embodiment, the regeneration operation (DPF regeneration operation) includes automatic regeneration, which automatically performs regeneration under normal operating conditions (a state in which normal operation and work can be performed without forcibly fixing the engine speed) when certain conditions are met, and stationary manual regeneration (manual regeneration), which performs regeneration at any timing required by user operation. Stationary manual regeneration is a control that stops normal operation with the user's permission and restores the performance of the DPF device 5 when the exhaust temperature does not rise sufficiently under normal operating conditions and the temperature of the DPF device 5 cannot be stably controlled to the target temperature. In stationary manual regeneration, the control device 100 first uses the monitor 8 to notify the user that stationary manual regeneration is possible and to issue a request to the user to perform it. In response, when the user uses the monitor 8 to issue an instruction to perform stationary manual regeneration, the control device 100 fixes the engine speed at a certain rotation speed, increases the exhaust temperature, and performs regeneration operation.

[0020] (Control device 100) 2 to 8, a configuration example and an operation example of the control device 100 shown in Fig. 1 will be described. Fig. 2 is a block diagram showing a configuration example of the control device 100 shown in Fig. 1. Figs. 3 to 7 are schematic diagrams for explaining the calculation unit 104 shown in Fig. 2. Fig. 8 is a flowchart showing an operation example of the control device 100 shown in Fig. 2.

[0021] The control device 100 shown in Fig. 2 can be configured using a computer such as a microcomputer and its peripheral circuits and devices, and has a functional configuration formed by a combination of hardware such as the computer and software such as a program executed by the computer, and includes multiple blocks shown in Fig. 2. In the example shown in Fig. 2, the control device 100 includes a fuel injection control unit 101, a filter regeneration control unit 102, an ash accumulation amount estimation unit 103, a calculation unit 104, an acquisition unit 105, a determination unit 106, and a notification unit 107.

[0022] The fuel injection control unit 101, for example, controls a fuel injection device (not shown) of the engine 1 in accordance with an instruction from the filter regeneration control unit 102 to perform, for example, post injection during regeneration operation.

[0023] The filter regeneration control unit 102 starts the regeneration operation based on the differential pressure of the DPF 52 detected by the pressure sensors 96 and 97, for example, when the differential pressure exceeds a predetermined threshold. The filter regeneration control unit 102 executes the regeneration operation, for example, as follows. The filter regeneration control unit 102 feedback-controls the DOC outlet temperature, for example, by controlling the post-injection of the engine 1 or controlling the amount of HC dosing by the HC doser 7, so that the DOC outlet temperature matches, for example, a predetermined regeneration target temperature. However, HC is not dosed (injected) until the DOC inlet temperature reaches a temperature (light-off temperature, for example, approximately 250°C) at which the catalyst contained in the DOC 51 is activated.

[0024] The filter regeneration control unit 102 also outputs regeneration information, which is information related to the regeneration interval (time interval of regeneration operation) of the DPF 52, to the acquisition unit 105, etc. In this embodiment, the regeneration information is information indicating the time interval or frequency of regeneration operation. Alternatively, the regeneration information may include a first count, which is the number of times the regeneration interval is within a first time, which is shorter than a predetermined time (hereinafter referred to as a second time), without exceeding the second time. Alternatively, the regeneration information may further include a second count, which is the number of times the regeneration interval is continuously within the second time. In the following description of the operation example, as an example, the first time is 10 hours and the second time is 15 hours. The number of times (second count) when the regeneration interval is 15 hours or less is represented as XX, and the number of times (first count) when the regeneration interval is 10 hours or less is represented as YY. Note that XX and YY are reset, for example, when the regeneration interval is greater than 15 hours or when a plurality of times greater than 15 hours are recorded.

[0025] The ash accumulation amount estimation unit 103 estimates the amount of ash accumulated in the DPF 52 and outputs information indicating the estimated value as ash information to the acquisition unit 105, etc. For example, the ash accumulation amount estimation unit 103 performs a DPF regeneration for estimating the ash accumulation amount that is longer than usual, and estimates the ash accumulation amount by calculating the difference between the DPF differential pressure when the PM accumulation amount is 0 g and the DPF differential pressure (initial value, set value) when the ash accumulation amount is 0 g. Alternatively, the ash accumulation amount estimation unit 103 estimates the amount of ash accumulated inside the DPF 52 from, for example, the amount of oil consumed and the ash capture rate by the DPF 52. In this embodiment, the ash accumulation amount is expressed in mass (g / L) per unit volume of the DPF 52. However, this is not limiting, and for example, mass may be used as a unit.

[0026] The calculation unit 104 calculates an allowable ash deposition amount threshold corresponding to the allowable ash deposition amount that changes depending on the atmospheric pressure. Here, with reference to FIGS. 3 to 7, the allowable ash deposition amount that changes depending on the atmospheric pressure will be described. Here, the allowable ash deposition amount threshold corresponds to the maximum value of the ash deposition amount that is allowable for maintaining the exhaust pressure within a range that is allowable for the engine 1, and is a value that changes depending on the atmospheric pressure. In the following operation example, the allowable ash deposition amount threshold is represented as ash deposition amount ZZ. Note that the allowable ash deposition amount threshold and ash deposition amount ZZ are examples of the third ash deposition amount threshold in the present disclosure.

[0027] FIG. 3 shows an example of the correspondence relationship between back pressure and turbine inlet temperature at two different altitudes, H1 and H2 (H2 > H1), with the horizontal axis representing back pressure (exhaust pressure) and the vertical axis representing the turbine inlet temperature of the turbocharger 2. The altitude is the operating altitude of the vehicle (engine 1). The upper limit temperature is the maximum allowable temperature for the turbine inlet temperature. In the relationship shown in FIG. 3, as the altitude increases, the turbine inlet temperature increases. Also, as the back pressure increases, the turbine inlet temperature increases. At altitude H2, if the back pressure increases, the turbine inlet temperature may exceed the upper limit temperature. On the other hand, at altitude H1, even if the back pressure increases, the turbine inlet temperature will not exceed the upper limit temperature. At altitude H2, the back pressure at which the turbine inlet temperature reaches the upper limit temperature is the allowable back pressure (maximum allowable back pressure). This back pressure corresponds to the DPF differential pressure.

[0028] Figure 4 shows an example of the relationship between altitude and air density, with the horizontal axis representing altitude and the vertical axis representing air density. Figure 4 shows that air density decreases as the engine operating altitude increases.

[0029] Figure 5 shows the relationship between atmospheric density and allowable back pressure, with atmospheric density on the horizontal axis and allowable back pressure on the vertical axis. Figure 5 shows that the allowable back pressure decreases as the atmospheric density decreases (as the altitude increases).

[0030] Figure 6 shows the relationship between the amount of ash accumulated in the DPF 52 and DPF pressure loss, with the horizontal axis representing the amount of ash accumulated and the vertical axis representing DPF pressure loss. When a large amount of ash accumulates beyond the circle shown in Figure 6, the DPF pressure loss increases exponentially, making it difficult to estimate the amount of ash accumulated from the DPF pressure loss. Therefore, it is necessary to clean the DPF before the amount of ash accumulated inside the DPF becomes excessive.

[0031] From the relationships shown in Figures 3 to 6, the maximum allowable ash deposition amount is the exhaust pressure at which the turbine inlet temperature reaches its upper limit at a certain atmospheric density. For example, the allowable exhaust pressure for the atmospheric density of altitude H2 shown in Figure 3 is the back pressure (exhaust pressure) at which the turbine inlet temperature reaches its upper limit, and corresponds to the ash deposition amount corresponding to this back pressure. The ash deposition amount at which this exhaust pressure occurs at the rated point is the ash deposition amount ZZ.

[0032] The calculation unit 104 calculates the ash accumulation amount ZZ (allowable ash accumulation amount threshold) using a table showing the correspondence relationship between the atmospheric density and the ash accumulation amount (ash accumulation amount ZZ) that results in an allowable back pressure, as shown in Fig. 7. The contents of the table can be set based on experimental results using a test machine or simulation results using a model that imitates the test machine.

[0033] The acquisition unit 105 acquires regeneration information from the filter regeneration control unit 102, ash information from the ash accumulation amount estimation unit 103, and information indicating atmospheric pressure from, for example, the atmospheric pressure sensor 98. Note that the information indicating atmospheric pressure may be acquired, for example, by the fuel injection control unit 101 acquiring the detection result of atmospheric pressure from the atmospheric pressure sensor 98, and then the fuel injection control unit 101 converting the detection result into atmospheric density based on temperature, and then the acquisition unit 105 acquiring the value of atmospheric density from the fuel injection control unit 101 as information indicating atmospheric pressure.

[0034] The determination unit 106 determines whether cleaning of the DPF 52 is necessary based on the regeneration information and the estimated value of the ash accumulation amount indicated by the ash information. Alternatively, the determination unit 106 determines that cleaning of the DPF 52 is necessary when the estimated value of the ash accumulation amount indicated by the ash information is equal to or greater than the allowable ash accumulation amount threshold calculated by the calculation unit 104. Note that the determination unit 106 may have a function of determining whether the engine 1 is operating, for example.

[0035] The determination unit 106 can determine the determination result as cleaning preparation, cleaning request, or cleaning not required based on the determination results of, for example, the following conditions 1 to 4. Cleaning preparation indicates a state in which preparation for cleaning of the DPF 52 is required. Cleaning request indicates a state in which cleaning of the DPF 52 is required. Cleaning not required indicates a state in which cleaning of the DPF 52 is not required. Note that in the following example, there are cases in which cleaning preparation is skipped and a cleaning request is issued.

[0036] Condition 1: Estimated ash accumulation amount ≧ 1.5 g / L. Note that 1.5 g / L is an example of the first ash accumulation amount threshold and the second ash accumulation amount threshold in the present disclosure. In this case, the first ash accumulation amount threshold and the second ash accumulation amount threshold are the same, but may be different.

[0037] Condition 2: The number of times XX where the playback interval is ≦15 hours is 2 or more. Note that this number of times 2 is an example of the second number threshold in the present disclosure.

[0038] Condition 3: The number YY of times the playback interval is ≦10 hours is 2 or more. Note that this number 2 is an example of the first number threshold in the present disclosure.

[0039] Condition 4: Estimated ash deposition amount ≧ ash deposition amount ZZ.

[0040] Conditions for cleaning preparation: Condition 1: True and Condition 2: True.

[0041] Cleaning request condition: (Condition 1: True and Condition 3: True) or Condition 4: True.

[0042] Conditions under which cleaning is not required: Other than those listed above.

[0043] The numerical values ​​for the amount of ash accumulation used in FIGS. 7 and 8 are tentative values ​​for the purpose of explanation and differ from the actual values.

[0044] When the determination unit 106 determines that cleaning of the DPF 52 is necessary, or when the determination unit 106 determines that preparation for cleaning of the DPF 52 is necessary, the notification unit 107 notifies the user of this fact, for example, via the monitor 8. Note that the notification unit 107 is not limited to notifying via the monitor 8, and may also notify the user of the need for cleaning or preparation for cleaning by sounding a buzzer attached to the vehicle, turning on or flashing a warning light, uttering a synthesized voice, or notifying a mobile terminal of the user or another administrator, a computer at a remote location, or the like.

[0045] Next, an example of operation of the control device 100 will be described with reference to FIG. 8. The process shown in FIG. 8 is started when the engine 1 is started. In FIG. 8, "Y" means Yes and "N" means No. When the process shown in FIG. 8 is started, the acquisition unit 105 acquires the estimated value of the ash accumulation amount, the number of times XX, the number of times YY, and the atmospheric pressure (step S1). Next, the calculation unit 104 refers to the atmospheric pressure and calculates the ash accumulation amount ZZ that becomes the allowable exhaust pressure (step S2). Next, the determination unit 106 determines whether the estimated value of the ash accumulation amount is ZZ g / L or more (step S3). If the estimated value of the ash accumulation amount is ZZ g / L or more (step S3: Y), the determination unit 106 determines that cleaning of the DPF 52 is necessary, and the notification unit 107 notifies that fact (step S4), and the process shown in FIG. 8 ends.

[0046] If the estimated value of the ash accumulation amount is not ZZ g / L or more (step S3: N), the determination unit 106 determines whether the estimated value of the ash accumulation amount is 1.5 g / L or more and the number of times YY is 2 or more (step S5). If the estimated value of the ash accumulation amount is 1.5 g / L or more and the number of times YY is 2 or more (step S5: Y), the determination unit 106 determines that cleaning of the DPF 52 is necessary, and the notification unit 107 notifies that fact (step S4), and the processing shown in Fig. 8 ends.

[0047] If the estimated value of the ash accumulation amount is not 1.5 g / L or more and the number of times YY is not 2 or more (step S5: N), the determination unit 106 determines whether the estimated value of the ash accumulation amount is 1.5 g / L or more and the number of times XX is 2 or more (step S6). If the estimated value of the ash accumulation amount is 1.5 g / L or more and the number of times XX is 2 or more (step S6: Y), the determination unit 106 determines that preparation for cleaning of the DPF 52 is necessary, and the notification unit 107 notifies that fact (step S7), and the processing shown in Fig. 8 ends.

[0048] If the estimated value of the ash deposition amount is not 1.5 g / L or more and the number XX is not 2 or more (step S6: N), for example, the determination unit 106 determines whether the engine 1 is operating (step S8). If the engine 1 is operating (step S8: Y), the process of step S1 is executed, and if the engine 1 is not operating (step S8: N), the process shown in FIG. 8 ends.

[0049] (Actions and Effects) As described above, according to this embodiment, it is possible to detect that the regeneration frequency is increasing due to the influence of ash accumulation based on the estimated value of the ash accumulation amount and the interval between regeneration operations, and therefore it is possible to notify the appropriate timing for cleaning the DPF 52.

[0050] Furthermore, the allowable maximum DPF pressure loss (= ash accumulation amount) is calculated based on the atmospheric pressure and the allowable temperature range, and if the ash accumulation amount exceeds this, a notification is issued to notify the timing of cleaning the DPF 52. According to this configuration, by changing the allowable back pressure according to the atmospheric density, the upper limit turbine inlet temperature is maintained, and the DPF 52 can be used up to the upper limit of the ash accumulation amount while protecting the engine. Furthermore, according to this embodiment, it is possible to prevent the pressure loss of the DPF 52 from becoming excessive due to ash, which would increase the exhaust temperature of the engine and cause damage to the engine.

[0051] According to this embodiment, it is possible to appropriately determine the timing for cleaning the DPF 52 (filter).

[0052] Furthermore, according to this embodiment, it is possible to distinguish between an increase in differential pressure due to ash and an increase in differential pressure due to PM, so that if the regeneration frequency is increasing due to ash, this can be detected and the appropriate timing for DPF cleaning can be notified. Furthermore, by distinguishing between ash and PM, troubleshooting can be performed efficiently and the vehicle stop time can be shortened. Furthermore, by identifying the cause, unnecessary DPF cleaning can be avoided.

[0053] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and design changes and the like are also included within the scope of the gist of the present invention. For example, in the above-described embodiments, the exhaust gas aftertreatment device is configured with a DPF device 5, but an SCR device (Selective Catalytic Reduction device) may be provided further downstream. Note that values ​​such as atmospheric density and ash accumulation amount that result in allowable back pressure are merely examples. [Explanation of symbols]

[0054] 1...engine, 2...turbocharger, 3...exhaust pipe, 5...DPF device, 7...HC dozer, 51...DOC, 52...DPF, 94...DOC inlet temperature sensor, 95...DOC outlet temperature sensor, 96, 97...pressure sensor, 98...atmospheric pressure sensor, 100...control device, 101...fuel injection control unit, 102...filter regeneration control unit, 103...ash deposition amount estimation unit, 104...calculation unit, 105...acquisition unit, 106...determination unit, 107...alert unit.

Claims

1. an acquisition unit that acquires information indicating an estimated value of the amount of ash accumulated on a filter that captures particulate matter in the exhaust gas of the engine and information indicating atmospheric pressure; a calculation unit that calculates an allowable ash accumulation amount threshold value corresponding to the allowable ash accumulation amount that changes depending on the atmospheric pressure; a determination unit that determines that cleaning of the filter is necessary when the estimated value is equal to or greater than the allowable ash accumulation amount threshold; a notification unit that notifies the user when it is determined that the filter needs to be cleaned; A processing device comprising:

2. The acquisition unit further acquires regeneration information which is information relating to a regeneration interval of the filter; the reproduction information includes a first number of times, which is the number of times the reproduction interval is within a first time period shorter than a predetermined second time period without exceeding the second time period; When determining whether or not cleaning of the filter is necessary based on the regeneration information and the estimated value, the determination unit determines that cleaning of the filter is necessary if the estimated value is equal to or greater than a predetermined first ash accumulation amount threshold and the first number of times is equal to or greater than a predetermined first number of times threshold. The processing device of claim 1 .

3. the playback information further includes a second number of times, which is the number of times the playback interval is continuously within the second time; The determination unit further determines that preparation for cleaning of the filter is necessary when the estimated value is equal to or greater than a predetermined second ash accumulation amount threshold and the second number of times is equal to or greater than a predetermined second number of times threshold, The notification unit further notifies the user when it is determined that preparation for cleaning of the filter is necessary. The processing device of claim 2 .

4. the acquisition unit further acquires regeneration information relating to a regeneration interval of the filter; the reproduction information includes a first number of times that the reproduction interval is within a first time period that is shorter than a predetermined second time period without exceeding the second time period, and a second number of times that the reproduction interval is continuously within the second time period, the determination unit determines that cleaning of the filter is necessary when the estimated value is equal to or greater than a predetermined first ash accumulation amount threshold and the first number of times is equal to or greater than a predetermined first number of times threshold, determines that preparation for cleaning of the filter is necessary when the estimated value is equal to or greater than a predetermined second ash accumulation amount threshold and the second number of times is equal to or greater than a predetermined second number of times threshold, and determines that cleaning of the filter is necessary when the estimated value is equal to or greater than the allowable ash accumulation amount threshold, The notification unit notifies the user when it is determined that cleaning of the filter is necessary, and also notifies the user when it is determined that preparation for cleaning of the filter is necessary. The processing device of claim 1 .

5. A step in which an acquisition unit of a processing device acquires information indicating an estimated value of the amount of ash accumulated on a filter that captures particulate matter in engine exhaust and information indicating atmospheric pressure; a calculation unit of the processing device calculating an allowable ash accumulation amount threshold value corresponding to an allowable ash accumulation amount that changes depending on the atmospheric pressure; a determination unit of the processing device determining that cleaning of the filter is necessary when the estimated value is equal to or greater than the allowable ash accumulation amount threshold; a notification unit of the processing device notifying the user that cleaning of the filter is necessary when the notification unit determines that cleaning of the filter is necessary; A processing method comprising:

6. In the step of acquiring information indicating an estimated value of the amount of ash accumulated on the filter and information indicating atmospheric pressure, the acquisition unit further acquires regeneration information, which is information related to a regeneration interval of the filter; the reproduction information includes a first number of times that the reproduction interval is within a first time period that is shorter than a predetermined second time period without exceeding the second time period, and a second number of times that the reproduction interval is continuously within the second time period, the determination unit determining that cleaning of the filter is necessary when the estimated value is equal to or greater than a predetermined first ash accumulation amount threshold and the first number of times is equal to or greater than a predetermined first number of times threshold; The determination unit determines that preparation for cleaning of the filter is necessary when the estimated value is equal to or greater than a predetermined second ash accumulation amount threshold and the second number of times is equal to or greater than a predetermined second number of times threshold; a step of notifying the user when it is determined that preparation for cleaning of the filter is necessary, by the notifying unit; The method of claim 5 further comprising:

7. a filter for capturing particulate matter in the engine exhaust; an acquisition unit that acquires information indicating an estimated value of the amount of ash accumulated on the filter and information indicating atmospheric pressure; a calculation unit that calculates an allowable ash accumulation amount threshold value corresponding to the allowable ash accumulation amount that changes depending on the atmospheric pressure; a determination unit that determines that cleaning of the filter is necessary when the estimated value is equal to or greater than the allowable ash accumulation amount threshold; a notification unit that notifies the user when it is determined that the filter needs to be cleaned; An exhaust gas treatment system comprising:

8. the acquisition unit further acquires regeneration information relating to a regeneration interval of the filter; the reproduction information includes a first number of times that the reproduction interval is within a first time period that is shorter than a predetermined second time period without exceeding the second time period, and a second number of times that the reproduction interval is continuously within the second time period, the determination unit determines that cleaning of the filter is necessary when the estimated value is equal to or greater than a predetermined first ash accumulation amount threshold and the first number of times is equal to or greater than a predetermined first number of times threshold, determines that preparation for cleaning of the filter is necessary when the estimated value is equal to or greater than a predetermined second ash accumulation amount threshold and the second number of times is equal to or greater than a predetermined second number of times threshold, and determines that cleaning of the filter is necessary when the estimated value is equal to or greater than the allowable ash accumulation amount threshold, The notification unit notifies the user when it is determined that cleaning of the filter is necessary, and also notifies the user when it is determined that preparation for cleaning of the filter is necessary.

8. The exhaust gas treatment system of claim 7.

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