Method, device and electronic equipment for monitoring DOC sulfur poisoning

Abstract

The application provides a DOC sulfur poisoning monitoring method, device and electronic equipment. The method comprises the following steps: obtaining an initial pressure difference carbon load; in the case that the initial pressure difference carbon load exceeds a first preset threshold, controlling the engine to perform DOC thermal management, so that the DOC performs passive regeneration, wherein the first preset threshold represents the maximum value of the cumulative value of the pressure difference carbon load of the DOC under normal conditions; controlling the engine to inject oil within a preset time period, obtaining a current pressure difference carbon load corresponding to the time when the engine completes the injection of oil, and calculating the absolute value of the difference between the current pressure difference carbon load and the initial pressure difference carbon load to obtain a carbon load change amount; and monitoring whether the DOC is poisoned by sulfur according to the carbon load change amount. Through the application, the technical problem that the DOC cannot be actively monitored for sulfur poisoning in the prior art, thereby causing engine blockage, is solved.

Description

Technical Field

[0001] This application relates to the field of engine gas emission monitoring technology, and more specifically, to a method for monitoring DOC sulfur poisoning, a device for monitoring DOC sulfur poisoning, a computer-readable storage medium, and an electronic device. Background Technology

[0002] Diesel oxidation catalysis (DOC) involves coating a honeycomb ceramic carrier with a noble metal catalyst (such as Pt). Its purpose is to lower the activation energy of chemical reactions involving HC, CO, and SOF in engine exhaust, allowing these substances to oxidize with oxygen in the exhaust at lower temperatures and ultimately convert into CO2 and H2O. Diesel particulate filters (DPFs) primarily filter and capture particulate matter in engine exhaust through diffusion, deposition, and impaction mechanisms. Over time, more and more particulate matter accumulates on the DPF, affecting its filtration efficiency and increasing exhaust back pressure. This negatively impacts engine ventilation and combustion, leading to reduced power output and increased fuel consumption. Therefore, timely removal of particulate matter from the DPF (DPF regeneration) is crucial. DPF regeneration refers to the process where, during long-term operation, the gradual increase in particulate matter in the filter causes increased engine back pressure, leading to decreased engine performance. Regularly removing deposited particulate matter restores the DPF's filtration performance.

[0003] There are two methods for DPF regeneration: active regeneration and passive regeneration. Active regeneration refers to using external energy to raise the temperature inside the DPF, causing the particulate matter to ignite and burn. Passive regeneration refers to the use of NO2 in the exhaust gas within a certain temperature range, where it has a strong oxidizing ability against the captured particles. NO2 can be used as an oxidant to remove particles from the particulate filter, generating CO2, which is then reduced back to NO, thus achieving the purpose of removing particulate matter. Currently, the quality of fuels on the market varies greatly. Poor-quality fuels are prone to DOC sulfur poisoning. When DOC sulfur poisoning is severe, it cannot be actively monitored, leading to a weakened oxidation effect of DOC on HC (hydrocarbons), ultimately preventing active DPF regeneration from being completed. If DOC sulfur poisoning is not detected in time, it can easily cause aftertreatment blockage, threatening the safe operation of the diesel engine.

[0004] Therefore, a method for proactive and timely monitoring of DOC sulfur poisoning is needed. Summary of the Invention

[0005] The main objective of this application is to provide a method, device, computer-readable storage medium, and electronic device for monitoring DOC sulfur poisoning, so as to at least solve the problem in the prior art that it is impossible to actively monitor whether DOC has suffered sulfur poisoning, which could lead to engine blockage.

[0006] To achieve the above objectives, according to one aspect of this application, a method for monitoring DOC sulfur poisoning is provided, comprising: acquiring an initial differential carbon load; if the initial differential carbon load exceeds a first preset threshold, controlling the engine to perform DOC thermal management, causing the DPF to undergo passive regeneration, wherein the first preset threshold represents the maximum value of the cumulative differential carbon load under normal DPF conditions; controlling the engine to inject fuel within a preset time period, acquiring the current differential carbon load corresponding to the moment the engine completes fuel injection, and calculating the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain a carbon load change; and monitoring whether sulfur poisoning has occurred in the DOC based on the carbon load change.

[0007] Optionally, controlling the engine to inject fuel within a preset time period includes: obtaining the upstream temperature of the DOC after the DPF undergoes passive regeneration, and controlling the engine to inject fuel within the preset time period when the upstream temperature of the DOC is greater than a preset temperature threshold, wherein the upstream temperature of the DOC is the temperature at which the gas has not yet entered the DOC.

[0008] Optionally, obtaining the current differential carbon load corresponding to the moment when the engine completes fuel injection includes: obtaining the DPF inlet temperature corresponding to each moment within the preset time period, wherein the DPF is mechanically connected to the DOC and is located downstream of the DOC, and the DPF inlet temperature represents the temperature at which the gas has not yet entered the DPF; and obtaining the current differential carbon load when each DPF inlet temperature is within the preset temperature range.

[0009] Optionally, monitoring whether the DOC has suffered sulfur poisoning based on the change in carbon load includes: determining that the DOC has suffered sulfur poisoning if the change in carbon load is less than or equal to a second preset threshold, wherein the second preset threshold represents the minimum reduction in differential carbon load after the preset time period of fuel injection if the DOC has not suffered sulfur poisoning; and determining that the DOC has not suffered sulfur poisoning if the change in carbon load is greater than the second preset threshold.

[0010] Optionally, after monitoring whether sulfur poisoning occurs in the DOC based on the change in carbon loading, the method further includes: issuing a sulfur poisoning fault alarm when it is determined that sulfur poisoning has occurred in the DOC, so as to warn that sulfur poisoning has occurred in the DOC.

[0011] Optionally, when the initial differential carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, including: when the initial differential carbon load exceeds the first preset threshold, acquiring a DOC sulfur poisoning active monitoring signal; and when the DOC sulfur poisoning active monitoring signal is acquired, controlling the engine to perform DOC thermal management.

[0012] Optionally, controlling the engine to perform DOC thermal management includes: acquiring the upstream temperature of the DOC before DOC thermal management; cooling the DOC if the upstream temperature is greater than a temperature threshold, wherein the upstream temperature is the temperature at which the gas has not yet entered the DOC; and heating the DOC if the upstream temperature is less than or equal to the temperature threshold.

[0013] According to another aspect of this application, a monitoring device for DOC sulfur poisoning is provided, comprising: a thermal management unit, configured to acquire an initial differential carbon load, and, when the initial differential carbon load exceeds a first preset threshold, control the engine to perform DOC thermal management, thereby causing the DPF to undergo passive regeneration, wherein the first preset threshold represents the maximum value of the cumulative differential carbon load under normal DPF conditions; a calculation unit, configured to control the engine to inject fuel within a preset time period, acquire the current differential carbon load corresponding to the moment when the engine completes fuel injection, and calculate the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain the carbon load change; and a monitoring unit, configured to monitor whether sulfur poisoning has occurred in the DOC based on the carbon load change.

[0014] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the described DOC sulfur poisoning monitoring methods.

[0015] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing any of the DOC sulfur poisoning monitoring methods described above.

[0016] By applying the technical solution of this application, the initial differential pressure carbon load is obtained. When the initial differential pressure carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, causing the DPF to passively regenerate. The first preset threshold represents the maximum cumulative value of the differential pressure carbon load under normal DPF conditions. The engine is controlled to inject fuel within a preset time period. The current differential pressure carbon load corresponding to the moment the engine completes fuel injection is obtained, and the absolute value of the difference between the current differential pressure carbon load and the initial differential pressure carbon load is calculated to obtain the carbon load change. The carbon load change is used to monitor whether sulfur poisoning has occurred in the DOC. Compared with existing technologies, where severe sulfur poisoning of the DOC cannot be actively monitored, this application triggers an active sulfur poisoning monitoring mode by exceeding the first preset threshold. That is, by statistically analyzing the carbon load change after DOC thermal management and engine fuel injection measures, sulfur poisoning of the DOC is monitored, thus achieving proactive monitoring of sulfur poisoning. Therefore, it solves the problem of existing technologies that cannot actively monitor whether sulfur poisoning has occurred in the DOC, achieving the goal of proactively and promptly monitoring the state of the DOC. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 A hardware block diagram of a mobile terminal for performing a monitoring method for DOC sulfur poisoning, according to an embodiment of this application, is shown.

[0019] Figure 2 A flowchart illustrating a method for monitoring DOC sulfur poisoning provided in an embodiment of this application is shown.

[0020] Figure 3 A schematic diagram of a process for obtaining the current differential carbon loading provided by an embodiment of this application is shown;

[0021] Figure 4 This illustration shows a flowchart of a process for monitoring whether sulfur poisoning has occurred in DOC, provided by an embodiment of this application.

[0022] Figure 5 A flowchart illustrating a specific method for monitoring DOC sulfur poisoning provided in an embodiment of this application is shown.

[0023] Figure 6 A structural block diagram of a monitoring device for DOC sulfur poisoning provided in an embodiment of this application is shown.

[0024] The above figures include the following reference numerals:

[0025] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0030] DOC: Diesel Oxidation Catalysis, abbreviated as DOC, is a particulate oxidation catalysis technology.

[0031] DPF: Diesel Particulate Filter, abbreviated as DPF.

[0032] Particulate matter: Particulate matter contained in the exhaust gas of an engine, generally including two components: soot and ash. Soot refers to the part that can be burned off through regeneration, while ash refers to the non-combustible component. The non-combustible component will continue to accumulate in the DPF. When it reaches a certain accumulation level, it needs to be cleaned at a service station.

[0033] Active regeneration: Diesel fuel is injected through the engine rear injection or the seventh fuel injector, causing soot to react with O2 at high temperature (above 500℃), which generally occurs cyclically.

[0034] Passive regeneration: Through engine thermal management measures or when the engine is operating under high temperature conditions, soot reacts with NO2 at a lower temperature (generally 350℃-450℃), which usually occurs continuously.

[0035] As described in the background section, existing technologies cannot actively monitor whether sulfur poisoning has occurred in the DOC, which could lead to engine blockage. To address the problem of not being able to actively monitor whether sulfur poisoning has occurred in the DOC, embodiments of this application provide a method for monitoring sulfur poisoning in the DOC, a device for monitoring sulfur poisoning in the DOC, a computer-readable storage medium, and an electronic device.

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0037] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a DOC sulfur poisoning monitoring method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0038] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the DOC sulfur poisoning monitoring method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0039] This embodiment provides a method for monitoring DOC sulfur poisoning that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0040] Figure 2 This is a flowchart of a method for monitoring DOC sulfur poisoning according to an embodiment of this application. Figure 2 As shown, the method includes the following steps:

[0041] Step S201: Obtain the initial differential carbon load. If the initial differential carbon load exceeds the first preset threshold, control the engine to perform DOC thermal management so that the DPF is passively regenerated. The first preset threshold represents the maximum value of the cumulative differential carbon load of the DPF under normal conditions.

[0042] Specifically, carbon load refers to the carbon particles accumulated in the exhaust gas of a vehicle during operation after passing through a DPF (diesel particulate filter). Carbon load is linearly correlated with the DPF pressure differential, hence it is also known as pressure differential carbon load. If the carbon load exceeds a certain value and is not addressed promptly, blockage can easily occur. This application triggers a monitoring mode for DOC sulfur poisoning based on whether the pressure differential carbon load exceeds a certain limit, namely a first preset threshold. If it exceeds the first preset threshold, it indicates that the pressure differential carbon load has reached a relatively high value, and blockage may occur if not addressed promptly. Therefore, when the initial pressure differential carbon load exceeds the first preset threshold, engine thermal management measures are used to raise the upstream temperature of the DOC to the ignition temperature of 280°C, actively triggering passive regeneration of the DPF.

[0043] Step S202: Control the engine to inject fuel within a preset time period, obtain the current differential carbon load corresponding to the moment when the engine completes fuel injection, and calculate the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain the carbon load change.

[0044] Specifically, the engine is then controlled to perform active fuel injection, raising the temperature before the DPF to 350℃~400℃ and maintaining it for half an hour. The amount of reduction in carbon load during this period is calculated, which is the absolute value of the difference between the current carbon load and the initial carbon load, to obtain the change in carbon load.

[0045] Step S203: Monitor whether sulfur poisoning has occurred in the DOC based on the aforementioned change in carbon loading.

[0046] Specifically, under normal conditions where the DOC is not poisoned by sulfur, the waste gases such as carbon should be consumed through the passive regeneration process described above. This means the change in carbon loading should decrease, and the amount of decrease corresponds to the temperature and time of passive regeneration. Therefore, when the decrease in pressure differential carbon loading exceeds a certain limit, the DOC is considered normal and free from sulfur poisoning, meaning the DOC can metabolize and consume the waste gases. Conversely, if the DOC is poisoned by sulfur, its oxidation of HC (hydrocarbons) weakens, preventing DPF regeneration from being completed. After the regeneration process, the change in carbon loading may be zero or may not reach the level seen when the DOC is not poisoned by sulfur. In other words, if the change in carbon loading is less than a certain limit, the DOC is considered to have suffered sulfur poisoning. The monitoring frequency described in this application is higher than the active regeneration frequency.

[0047] This embodiment obtains the initial differential carbon load. When the initial differential carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, causing the DPF to passively regenerate. The first preset threshold represents the maximum cumulative value of the differential carbon load under normal DPF conditions. The engine is controlled to inject fuel within a preset time period. The current differential carbon load at the moment the engine completes fuel injection is obtained, and the absolute value of the difference between the current differential carbon load and the initial differential carbon load is calculated to obtain the carbon load change. The carbon load change is used to monitor whether sulfur poisoning has occurred in the DOC. Compared to existing technologies, which cannot actively monitor severe sulfur poisoning in the DOC, this application triggers an active sulfur poisoning monitoring mode when the differential carbon load exceeds the first preset threshold. This involves monitoring the carbon load change after DOC thermal management and engine fuel injection measures to proactively monitor for sulfur poisoning. Therefore, this solves the problem of not being able to actively monitor whether sulfur poisoning has occurred in the DOC in existing technologies, achieving the goal of proactively and promptly monitoring the DOC's state.

[0048] In specific implementation, step S202 above, which controls the engine to inject fuel within a preset time period, can be achieved through the following steps: obtaining the upstream temperature of the DOC after the DPF undergoes passive regeneration; and controlling the engine to inject fuel within the preset time period when the upstream temperature of the DOC is greater than a preset temperature threshold. The upstream temperature of the DOC is the temperature at which the gas has not yet entered the DOC. This method controls engine fuel injection through the above steps, ensuring that fuel injection only occurs under the aforementioned specific conditions, thus avoiding fuel waste caused by injecting fuel before combustion conditions are met.

[0049] Specifically, the preset temperature threshold is usually the engine's ignition temperature limit, such as 280°C. The upstream temperature of the DOC can be understood as the temperature of the exhaust gases before they enter the DOC. Fuel injection is only performed when the upstream temperature of the DOC is higher than the ignition temperature limit, thus allowing for complete combustion and active regeneration of the fuel.

[0050] In some optional implementations, the step S202 above, which obtains the current differential carbon load corresponding to the moment when the engine completes fuel injection, can be achieved through the following steps: such as... Figure 3As shown, step S2021: Obtain the DPF inlet temperature at each moment within the preset time period, wherein the DPF is mechanically connected to the DOC and located downstream of the DOC, and the DPF inlet temperature represents the temperature at which the gas has not yet entered the DPF; step S2022: If each DPF inlet temperature is within the preset temperature range, obtain the current differential carbon loading. This method obtains the differential carbon loading only when the above conditions are met, which allows the DPF to react fully before obtaining the current differential carbon loading, making the obtained current differential carbon loading more accurate and effective.

[0051] In the specific implementation process, after the oil is injected, the temperature before the DPF is raised to a preset temperature range, such as 350℃~400℃, and maintained for a preset time period, such as 0.5h. This allows HC (hydrocarbons) to burn completely, thereby more accurately reflecting the state of DOC, such as whether sulfur poisoning has occurred.

[0052] To accurately determine whether sulfur poisoning has occurred in DOC, step S203 above monitors whether sulfur poisoning has occurred in DOC based on the aforementioned change in carbon loading. This can be achieved through the following steps: Figure 4 As shown: Step S2031: If the change in carbon loading is less than or equal to a second preset threshold, it is determined that the DOC has suffered sulfur poisoning, wherein the second preset threshold represents the minimum reduction in differential carbon loading after the preset time period of fuel injection, assuming the DOC has not suffered sulfur poisoning; Step S2032: If the change in carbon loading is greater than the second preset threshold, it is determined that the DOC has not suffered sulfur poisoning. This method monitors whether the DOC has suffered sulfur poisoning through the above steps, thus conveniently and easily determining whether the DOC has suffered sulfur poisoning by measuring the change in carbon loading.

[0053] Specifically, as mentioned above, in the case of sulfur poisoning in DOC, the hydrocarbons in DOC cannot be fully combusted, resulting in a lower-than-normal change in carbon load after the aforementioned thermal management and fuel injection steps. Therefore, sulfur poisoning in DOC can be determined if the change in carbon load is less than or equal to the second preset threshold. Similarly, in the case of no sulfur poisoning in DOC, the hydrocarbons in DOC can still be fully combusted, and the change in carbon load is normal after thermal management and fuel injection steps. That is, sulfur poisoning in DOC can be determined if the change in carbon load is greater than the aforementioned second preset threshold.

[0054] In some optional embodiments, after monitoring whether sulfur poisoning has occurred in the DOC based on the aforementioned carbon load change, the method further includes: issuing a sulfur poisoning fault alarm if sulfur poisoning is determined to have occurred in the DOC, thereby alerting the DOC to the presence of sulfur poisoning. This method, by issuing an alarm in the event of sulfur poisoning through the aforementioned steps, can remind personnel to take timely action and prevent further damage to the engine.

[0055] In practice, if sulfur poisoning is detected in the DOC, a sulfur poisoning fault alarm should be issued in a timely manner to warn staff that sulfur poisoning has occurred and to remind them to come to the station for maintenance.

[0056] To promptly control DOC thermal management, when the initial differential carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, including: acquiring an active monitoring signal for DOC sulfur poisoning when the initial differential carbon load exceeds the first preset threshold; and controlling the engine to perform DOC thermal management upon acquiring the active monitoring signal for DOC sulfur poisoning. This method further controls the engine to perform DOC thermal management using the active monitoring signal for DOC sulfur poisoning.

[0057] Specifically, when the initial differential carbon loading exceeds a first preset threshold, an active monitoring process for sulfur poisoning is initiated by acquiring a DOC sulfur poisoning active monitoring signal. The monitoring frequency is higher than the active regeneration frequency. Active regeneration generally occurs periodically. The monitoring frequency in this application is determined based on the initial differential carbon loading. As long as the initial differential carbon loading exceeds the first preset threshold, the sulfur poisoning monitoring process is initiated. Therefore, to a certain extent, the monitoring frequency is higher than the active regeneration frequency.

[0058] In some optional embodiments, controlling the engine to perform DOC thermal management includes: acquiring the upstream temperature of the DOC before thermal management; cooling the DOC if the upstream temperature is greater than a temperature threshold, wherein the upstream temperature is the temperature before the gas enters the DOC; and heating the DOC if the upstream temperature is less than or equal to the temperature threshold. This method performs thermal management through the above steps, allowing thermal management to be performed based on the current state of the DOC, ensuring that hydrocarbons can burn completely after the DOC reaches certain conditions, thereby accurately measuring the change in carbon load.

[0059] Specifically, thermal management is the process of adjusting and controlling the temperature or temperature difference of an object using heating or cooling methods, based on the specific requirements of the object. For example, in the thermal management of a DOC (Demand for Open-Ended Cylinder), the upstream temperature is generally initially below a temperature threshold, which can be the ignition temperature of 280°C. In this case, heating is performed to bring the upstream temperature of the DOC up to the ignition temperature of 280°C. Of course, if the upstream temperature of the DOC is much higher than the ignition temperature of 280°C, cooling is necessary.

[0060] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the DOC sulfur poisoning monitoring method of this application will be described in detail below with reference to specific embodiments.

[0061] This embodiment relates to a specific method for monitoring DOC sulfur poisoning, such as... Figure 5 As shown, it includes the following steps:

[0062] Step S1: Begin;

[0063] Step S2: Determine whether the differential carbon loading (initial differential carbon loading) exceeds the limit (first preset threshold). If yes, proceed to step S3; otherwise, continue to proceed to step S1.

[0064] Step S3: Trigger active and passive regeneration to enter DOC sulfur poisoning detection, and first perform (DOC) thermal management;

[0065] Step S4: Determine if the temperature before (upstream) DOC is greater than or equal to the ignition temperature limit (e.g., 280℃) (preset temperature threshold). If yes, proceed to step S5; otherwise, proceed to step S3.

[0066] Step S5: Perform oil injection to raise the temperature before the DPF to 350℃~400℃ (preset temperature range) and maintain it for 0.5h (preset time period);

[0067] Step S6: Does the decrease in carbon loading due to pressure difference (change in carbon loading) Δmsoot ≥ the limit (second preset threshold)? If yes, proceed to step S7; otherwise, proceed to step S8.

[0068] Step S7: DOC is normal;

[0069] Step S8: DOC sulfur poisoning, alarm sounds;

[0070] Step S9: End.

[0071] This application also provides a monitoring device for DOC sulfur poisoning. It should be noted that the monitoring device for DOC sulfur poisoning in this application can be used to execute the monitoring method for DOC sulfur poisoning provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0072] The following describes the monitoring device for DOC sulfur poisoning provided in the embodiments of this application.

[0073] Figure 6 This is a schematic diagram of a monitoring device for DOC sulfur poisoning according to an embodiment of this application. Figure 6 As shown, the device includes:

[0074] Thermal management unit 10 is used to obtain the initial differential carbon load. When the initial differential carbon load exceeds a first preset threshold, it controls the engine to perform DOC thermal management so that the DPF is passively regenerated. The first preset threshold represents the maximum value of the cumulative differential carbon load of the DPF under normal conditions.

[0075] Specifically, carbon load refers to the carbon particles accumulated in the exhaust gas of a vehicle during operation after passing through a DPF (diesel particulate filter). Carbon load is linearly correlated with the DPF pressure differential, hence it is also known as pressure differential carbon load. If the carbon load exceeds a certain value and is not addressed promptly, blockage can easily occur. This application triggers a monitoring mode for DOC sulfur poisoning based on whether the pressure differential carbon load exceeds a certain limit, namely a first preset threshold. If it exceeds the first preset threshold, it indicates that the pressure differential carbon load has reached a relatively high value, and blockage may occur if not addressed promptly. Therefore, when the initial pressure differential carbon load exceeds the first preset threshold, engine thermal management measures are used to raise the upstream temperature of the DOC to the ignition temperature of 280°C, actively triggering passive regeneration of the DPF.

[0076] The calculation unit 20 is used to control the engine to inject fuel within a preset time period, obtain the current differential carbon load corresponding to the moment when the engine completes fuel injection, and calculate the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain the carbon load change.

[0077] Specifically, the engine is then controlled to perform active fuel injection, raising the temperature before the DPF to 350℃~400℃ and maintaining it for half an hour. The amount of reduction in carbon load during this period is calculated, which is the absolute value of the difference between the current carbon load and the initial carbon load, to obtain the change in carbon load.

[0078] The monitoring unit 30 is used to monitor whether sulfur poisoning has occurred in the DOC based on the aforementioned changes in carbon loading.

[0079] Specifically, under normal conditions where the DOC is not poisoned by sulfur, the waste gases such as carbon should be consumed through the passive regeneration process described above. This means the change in carbon loading should decrease, and the amount of decrease corresponds to the temperature and time of passive regeneration. Therefore, when the decrease in pressure differential carbon loading exceeds a certain limit, the DOC is considered normal and free from sulfur poisoning, meaning the DOC can metabolize and consume the waste gases. Conversely, if the DOC is poisoned by sulfur, its oxidation of HC (hydrocarbons) weakens, preventing DPF regeneration from being completed. After the regeneration process, the change in carbon loading may be zero or may not reach the level seen when the DOC is not poisoned by sulfur. In other words, if the change in carbon loading is less than a certain limit, the DOC is considered to have suffered sulfur poisoning. The monitoring frequency described in this application is higher than the active regeneration frequency.

[0080] This embodiment obtains the initial differential carbon load. When the initial differential carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, causing the DPF to passively regenerate. The first preset threshold represents the maximum cumulative value of the differential carbon load under normal DPF conditions. The engine is controlled to inject fuel within a preset time period. The current differential carbon load at the moment the engine completes fuel injection is obtained, and the absolute value of the difference between the current differential carbon load and the initial differential carbon load is calculated to obtain the carbon load change. The carbon load change is used to monitor whether sulfur poisoning has occurred in the DOC. Compared to existing technologies, which cannot actively monitor severe sulfur poisoning in the DOC, this application triggers an active sulfur poisoning monitoring mode when the differential carbon load exceeds the first preset threshold. This involves monitoring the carbon load change after DOC thermal management and engine fuel injection measures to proactively monitor for sulfur poisoning. Therefore, this solves the problem of not being able to actively monitor whether sulfur poisoning has occurred in the DOC in existing technologies, achieving the goal of proactively and promptly monitoring the DOC's state.

[0081] In its specific implementation, the calculation unit includes a first control module, used to acquire the upstream temperature of the DOC after the DPF undergoes passive regeneration. If the upstream temperature of the DOC exceeds a preset temperature threshold, the module controls the engine to inject fuel within the preset time period. The upstream temperature of the DOC is the temperature at which the gas has not yet entered the DOC. This device controls engine fuel injection through the above steps, ensuring that fuel injection only occurs under specific conditions, thus avoiding fuel waste caused by injecting fuel before combustion conditions are met.

[0082] Specifically, the preset temperature threshold is usually the engine's ignition temperature limit, such as 280°C. The upstream temperature of the DOC can be understood as the temperature of the exhaust gases before they enter the DOC. Fuel injection is only performed when the upstream temperature of the DOC is higher than the ignition temperature limit, thus allowing for complete combustion and active regeneration of the fuel.

[0083] In some optional embodiments, the calculation unit further includes a first acquisition module and a second acquisition module. The first acquisition module is used to acquire the DPF inlet temperature at each moment within the preset time period, wherein the DPF is mechanically connected to the DOC and located downstream of the DOC, and the DPF inlet temperature represents the temperature at which the gas has not yet entered the DPF. The second acquisition module is used to acquire the current differential carbon loading when each DPF inlet temperature is within the preset temperature range. This device acquires the differential carbon loading only when the above conditions are met, allowing the DPF to react fully before acquiring the current differential carbon loading, making the acquired current differential carbon loading more accurate and effective.

[0084] In the specific implementation process, after the oil is injected, the temperature before the DPF is raised to a preset temperature range, such as 350℃~400℃, and maintained for a preset time period, such as 0.5h. This allows HC (hydrocarbons) to burn completely, thereby more accurately reflecting the state of DOC, such as whether sulfur poisoning has occurred.

[0085] To accurately determine whether sulfur poisoning has occurred in the DOC, the monitoring unit includes a first determining module and a second determining module. The first determining module determines that sulfur poisoning has occurred in the DOC if the change in carbon loading is less than or equal to a second preset threshold, where the second preset threshold represents the minimum reduction in differential carbon loading after a preset time period of fuel injection, assuming no sulfur poisoning has occurred in the DOC. The second determining module determines that sulfur poisoning has not occurred in the DOC if the change in carbon loading is greater than the second preset threshold. This device monitors whether sulfur poisoning has occurred in the DOC through the above steps, thus conveniently and easily determining whether sulfur poisoning has occurred in the DOC based on the change in carbon loading.

[0086] Specifically, as mentioned above, in the case of sulfur poisoning in DOC, the hydrocarbons in DOC cannot be fully combusted, resulting in a lower-than-normal change in carbon load after the aforementioned thermal management and fuel injection steps. Therefore, sulfur poisoning in DOC can be determined if the change in carbon load is less than or equal to the second preset threshold. Similarly, in the case of no sulfur poisoning in DOC, the hydrocarbons in DOC can still be fully combusted, and the change in carbon load is normal after thermal management and fuel injection steps. That is, sulfur poisoning in DOC can be determined if the change in carbon load is greater than the aforementioned second preset threshold.

[0087] In some optional embodiments, the device further includes an alarm unit for issuing a sulfur poisoning alarm when sulfur poisoning is detected in the DOC, thereby alerting the DOC to sulfur poisoning. By issuing an alarm in the event of sulfur poisoning through the aforementioned steps, the device can remind personnel to take timely action and prevent further damage to the engine.

[0088] In practice, if sulfur poisoning is detected in the DOC, a sulfur poisoning fault alarm should be issued in a timely manner to warn staff that sulfur poisoning has occurred and to remind them to come to the station for maintenance.

[0089] To promptly control DOC (Dry Oxide Carbon) for thermal management, the thermal management unit includes a second acquisition module and a second control module. The acquisition module acquires an active monitoring signal for DOC sulfur poisoning when the initial differential pressure carbon load exceeds a first preset threshold. The control module controls the engine to perform DOC thermal management upon acquiring the active monitoring signal for DOC sulfur poisoning. This device further controls the engine to perform DOC thermal management using the active monitoring signal for DOC sulfur poisoning.

[0090] Specifically, when the initial differential carbon loading exceeds a first preset threshold, an active monitoring process for sulfur poisoning is initiated by acquiring a DOC sulfur poisoning active monitoring signal. The monitoring frequency is higher than the active regeneration frequency. Active regeneration generally occurs periodically. The monitoring frequency in this application is determined based on the initial differential carbon loading. As long as the initial differential carbon loading exceeds the first preset threshold, the sulfur poisoning monitoring process is initiated. Therefore, to a certain extent, the monitoring frequency is higher than the active regeneration frequency.

[0091] In some optional embodiments, the thermal management unit further includes a cooling module and a heating module. The cooling module is used to acquire the upstream temperature of the DOC before thermal management. If the upstream temperature is greater than a temperature threshold, the DOC is cooled down. The upstream temperature is the temperature before the gas enters the DOC. The heating module is used to heat the DOC if the upstream temperature is less than or equal to the temperature threshold. This device performs thermal management through the above steps, allowing it to be tailored to the current state of the DOC. This ensures that once certain conditions are met, hydrocarbons can burn completely, thereby allowing for accurate measurement of changes in carbon loading.

[0092] Specifically, thermal management is the process of adjusting and controlling the temperature or temperature difference of an object using heating or cooling methods, based on the specific requirements of the object. For example, in the thermal management of a DOC (Demand for Open-Ended Cylinder), the upstream temperature is generally initially below a temperature threshold, which can be the ignition temperature of 280°C. In this case, heating is performed to bring the upstream temperature of the DOC up to the ignition temperature of 280°C. Of course, if the upstream temperature of the DOC is much higher than the ignition temperature of 280°C, cooling is necessary.

[0093] The aforementioned DOC sulfur poisoning monitoring device includes a processor and a memory. The thermal management unit, computing unit, and monitoring unit are all stored as program units in the memory, and the processor executes these program units to achieve their respective functions. All of the above modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0094] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and kernel parameters can be adjusted to actively monitor whether sulfur poisoning of the DOC (Diesel Oxide) has occurred, potentially causing engine blockage.

[0095] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0096] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the DOC sulfur poisoning monitoring method.

[0097] Specifically, methods for monitoring DOC sulfur poisoning include:

[0098] Step S201: Obtain the initial differential carbon load. If the initial differential carbon load exceeds the first preset threshold, control the engine to perform DOC thermal management so that the DPF is passively regenerated. The first preset threshold represents the maximum value of the cumulative differential carbon load of the DPF under normal conditions.

[0099] Specifically, carbon load refers to the carbon particles accumulated in the exhaust gas of a vehicle during operation after passing through a DPF (diesel particulate filter). Carbon load is linearly correlated with the DPF pressure differential, hence it is also known as pressure differential carbon load. If the carbon load exceeds a certain value and is not addressed promptly, blockage can easily occur. This application triggers a monitoring mode for DOC sulfur poisoning based on whether the pressure differential carbon load exceeds a certain limit, namely a first preset threshold. If it exceeds the first preset threshold, it indicates that the pressure differential carbon load has reached a relatively high value, and blockage may occur if not addressed promptly. Therefore, when the initial pressure differential carbon load exceeds the first preset threshold, engine thermal management measures are used to raise the upstream temperature of the DOC to the ignition temperature of 280°C, actively triggering passive regeneration of the DPF.

[0100] Step S202: Control the engine to inject fuel within a preset time period, obtain the current differential carbon load corresponding to the moment when the engine completes fuel injection, and calculate the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain the carbon load change.

[0101] Specifically, the engine is then controlled to perform active fuel injection, raising the temperature before the DPF to 350℃~400℃ and maintaining it for half an hour. The amount of reduction in carbon load during this period is calculated, which is the absolute value of the difference between the current carbon load and the initial carbon load, to obtain the change in carbon load.

[0102] Step S203: Monitor whether sulfur poisoning has occurred in the DOC based on the aforementioned change in carbon loading.

[0103] Specifically, under normal conditions where the DOC is not poisoned by sulfur, the waste gases such as carbon should be consumed through the passive regeneration process described above. This means the change in carbon loading should decrease, and the amount of decrease corresponds to the temperature and time of passive regeneration. Therefore, when the decrease in pressure differential carbon loading exceeds a certain limit, the DOC is considered normal and free from sulfur poisoning, meaning the DOC can metabolize and consume the waste gases. Conversely, if the DOC is poisoned by sulfur, its oxidation of HC (hydrocarbons) weakens, preventing DPF regeneration from being completed. After the regeneration process, the change in carbon loading may be zero or may not reach the level seen when the DOC is not poisoned by sulfur. In other words, if the change in carbon loading is less than a certain limit, the DOC is considered to have suffered sulfur poisoning. The monitoring frequency described in this application is higher than the active regeneration frequency.

[0104] Optionally, controlling the engine to inject fuel within a preset time period includes: obtaining the upstream temperature of the DOC after the DPF undergoes passive regeneration; and controlling the engine to inject fuel within the preset time period when the upstream temperature of the DOC is greater than a preset temperature threshold, wherein the upstream temperature of the DOC is the temperature at which the gas has not yet entered the DOC.

[0105] Optionally, obtaining the current differential carbon load corresponding to the moment when the engine completes fuel injection includes: obtaining the DPF inlet temperature corresponding to each moment within the preset time period, wherein the DPF is mechanically connected to the DOC and is located downstream of the DOC, and the DPF inlet temperature represents the temperature at which the gas has not yet entered the DPF; and obtaining the current differential carbon load when each DPF inlet temperature is within the preset temperature range.

[0106] Optionally, monitoring whether the DOC has suffered sulfur poisoning based on the aforementioned carbon load change includes: determining that the DOC has suffered sulfur poisoning if the aforementioned carbon load change is less than or equal to a second preset threshold, wherein the aforementioned second preset threshold represents the minimum reduction in the differential carbon load after the aforementioned preset time period of fuel injection if the DOC has not suffered sulfur poisoning; and determining that the DOC has not suffered sulfur poisoning if the aforementioned carbon load change is greater than the aforementioned second preset threshold.

[0107] Optionally, after monitoring whether sulfur poisoning occurs in the DOC based on the aforementioned change in carbon loading, the method further includes: issuing a sulfur poisoning fault alarm when it is determined that sulfur poisoning has occurred in the DOC, so as to warn that sulfur poisoning has occurred in the DOC.

[0108] Optionally, when the initial differential carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, including: when the initial differential carbon load exceeds the first preset threshold, acquiring a DOC sulfur poisoning active monitoring signal; and when the DOC sulfur poisoning active monitoring signal is acquired, controlling the engine to perform DOC thermal management.

[0109] Optionally, controlling the engine to perform DOC thermal management includes: acquiring the upstream temperature of the DOC before DOC thermal management; cooling the DOC if the upstream temperature is greater than a temperature threshold, wherein the upstream temperature is the temperature at which the gas has not yet entered the DOC; and heating the DOC if the upstream temperature is less than or equal to the temperature threshold.

[0110] This invention provides an electronic device, including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0111] Step S201: Obtain the initial differential carbon load. If the initial differential carbon load exceeds the first preset threshold, control the engine to perform DOC thermal management so that the DPF is passively regenerated. The first preset threshold represents the maximum value of the cumulative differential carbon load of the DPF under normal conditions.

[0112] Step S202: Control the engine to inject fuel within a preset time period, obtain the current differential carbon load corresponding to the moment when the engine completes fuel injection, and calculate the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain the carbon load change.

[0113] Step S203: Monitor whether sulfur poisoning has occurred in the DOC based on the aforementioned change in carbon loading.

[0114] The devices mentioned in this article can be servers, PCs, tablets, mobile phones, etc.

[0115] Optionally, controlling the engine to inject fuel within a preset time period includes: obtaining the upstream temperature of the DOC after the DPF undergoes passive regeneration; and controlling the engine to inject fuel within the preset time period when the upstream temperature of the DOC is greater than a preset temperature threshold, wherein the upstream temperature of the DOC is the temperature at which the gas has not yet entered the DOC.

[0116] Optionally, obtaining the current differential carbon load corresponding to the moment when the engine completes fuel injection includes: obtaining the DPF inlet temperature corresponding to each moment within the preset time period, wherein the DPF is mechanically connected to the DOC and is located downstream of the DOC, and the DPF inlet temperature represents the temperature at which the gas has not yet entered the DPF; and obtaining the current differential carbon load when each DPF inlet temperature is within the preset temperature range.

[0117] Optionally, monitoring whether the DOC has suffered sulfur poisoning based on the aforementioned carbon load change includes: determining that the DOC has suffered sulfur poisoning if the aforementioned carbon load change is less than or equal to a second preset threshold, wherein the aforementioned second preset threshold represents the minimum reduction in the differential carbon load after the aforementioned preset time period of fuel injection if the DOC has not suffered sulfur poisoning; and determining that the DOC has not suffered sulfur poisoning if the aforementioned carbon load change is greater than the aforementioned second preset threshold.

[0118] Optionally, after monitoring whether sulfur poisoning occurs in the DOC based on the aforementioned change in carbon loading, the method further includes: issuing a sulfur poisoning fault alarm when it is determined that sulfur poisoning has occurred in the DOC, so as to warn that sulfur poisoning has occurred in the DOC.

[0119] Optionally, when the initial differential carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, including: when the initial differential carbon load exceeds the first preset threshold, acquiring a DOC sulfur poisoning active monitoring signal; and when the DOC sulfur poisoning active monitoring signal is acquired, controlling the engine to perform DOC thermal management.

[0120] Optionally, controlling the engine to perform DOC thermal management includes: acquiring the upstream temperature of the DOC before DOC thermal management; cooling the DOC if the upstream temperature is greater than a temperature threshold, wherein the upstream temperature is the temperature at which the gas has not yet entered the DOC; and heating the DOC if the upstream temperature is less than or equal to the temperature threshold.

[0121] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the methods described in the various embodiments of this application:

[0122] Step S201: Obtain the initial differential carbon load. If the initial differential carbon load exceeds the first preset threshold, control the engine to perform DOC thermal management so that the DPF is passively regenerated. The first preset threshold represents the maximum value of the cumulative differential carbon load of the DPF under normal conditions.

[0123] Step S202: Control the engine to inject fuel within a preset time period, obtain the current differential carbon load corresponding to the moment when the engine completes fuel injection, and calculate the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain the carbon load change.

[0124] Step S203: Monitor whether sulfur poisoning has occurred in the DOC based on the aforementioned change in carbon loading.

[0125] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0126] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0127] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0128] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0129] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0130] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0131] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0132] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0133] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0134] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0135] 1) In the DOC sulfur poisoning monitoring method of this application, the initial differential pressure carbon load is obtained. When the initial differential pressure carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, causing the DPF to passively regenerate. The first preset threshold represents the maximum cumulative value of the differential pressure carbon load under normal DPF conditions. The engine is controlled to inject fuel within a preset time period. The current differential pressure carbon load corresponding to the moment the engine completes fuel injection is obtained, and the absolute value of the difference between the current differential pressure carbon load and the initial differential pressure carbon load is calculated to obtain the carbon load change. The carbon load change is used to monitor whether sulfur poisoning has occurred in the DOC. Compared with existing technologies, where severe sulfur poisoning of the DOC cannot be actively monitored, this application triggers an active sulfur poisoning monitoring mode by exceeding the first preset threshold. That is, by statistically analyzing the carbon load change after DOC thermal management and engine fuel injection, the method monitors whether sulfur poisoning has occurred in the DOC, thus achieving proactive monitoring of sulfur poisoning. Therefore, it solves the problem of existing technologies being unable to actively monitor whether sulfur poisoning has occurred in the DOC, achieving the goal of proactively and promptly monitoring the state of the DOC.

[0136] 2) In the DOC sulfur poisoning monitoring device of this application, the initial differential pressure carbon load is acquired. When the initial differential pressure carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, causing the DPF to passively regenerate. The first preset threshold represents the maximum cumulative value of the differential pressure carbon load under normal DPF conditions. The engine is controlled to inject fuel within a preset time period. The current differential pressure carbon load corresponding to the moment the engine completes fuel injection is acquired, and the absolute value of the difference between the current differential pressure carbon load and the initial differential pressure carbon load is calculated to obtain the carbon load change. The carbon load change is used to monitor whether DOC sulfur poisoning has occurred. Compared with the prior art, which cannot actively monitor severe sulfur poisoning of DOC, this application triggers an active sulfur poisoning monitoring mode by exceeding the first preset threshold. That is, by statistically analyzing the carbon load change after DOC thermal management and engine fuel injection, it monitors whether DOC sulfur poisoning has occurred, thus achieving proactive sulfur poisoning monitoring. Therefore, it can solve the problem of the prior art's inability to actively monitor whether DOC sulfur poisoning has occurred, achieving the goal of proactively and promptly monitoring the state of DOC.

[0137] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for monitoring DOC sulfur poisoning, wherein, The DPF is mechanically connected to the DOC and located downstream of the DOC, characterized in that it includes: The initial differential carbon load of the DPF is obtained. If the initial differential carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, so that the DPF is passively regenerated. The first preset threshold represents the maximum value of the cumulative differential carbon load of the DPF under normal conditions. The engine is controlled to inject fuel within a preset time period. The current differential carbon load corresponding to the moment when the engine completes fuel injection is obtained, and the absolute value of the difference between the current differential carbon load and the initial differential carbon load is calculated to obtain the carbon load change. Monitor whether sulfur poisoning occurs in the DOC based on the change in carbon loading; The control of the engine to inject fuel within a preset time period includes: The upstream temperature of the DOC after the DPF undergoes passive regeneration is obtained. If the upstream temperature of the DOC is greater than a preset temperature threshold, the engine is controlled to inject fuel within the preset time period. The upstream temperature of the DOC is the temperature at which the gas has not yet entered the DOC, and the preset temperature threshold is the ignition temperature limit for engine fuel injection. The monitoring of whether sulfur poisoning has occurred in the DOC based on the change in carbon loading includes: If the change in carbon load is less than a second preset threshold, it is determined that the DOC has suffered sulfur poisoning, wherein the second preset threshold represents the minimum reduction in differential carbon load after the preset time period of oil injection when the DOC has not suffered sulfur poisoning. If the change in carbon loading is greater than the second preset threshold, it is determined that the DOC has not been poisoned by sulfur.

2. The monitoring method according to claim 1, characterized in that, Obtaining the current differential carbon load corresponding to the moment when the engine completes fuel injection includes: Obtain the DPF inlet temperature at each moment within the preset time period, wherein the DPF inlet temperature represents the temperature at which the gas has not yet entered the DPF; The current carbon loading under pressure difference is obtained when the temperature before each DPF is within a preset temperature range.

3. The monitoring method according to claim 1, characterized in that, After monitoring whether sulfur poisoning has occurred in the DOC based on the change in carbon loading, the method further includes: If sulfur poisoning is detected in the DOC, a sulfur poisoning fault alarm is issued to warn that sulfur poisoning has occurred in the DOC.

4. The monitoring method according to claim 1, characterized in that, When the initial differential pressure carbon load exceeds a first preset threshold, the engine is controlled to perform DOC thermal management, including: When the initial differential carbon loading exceeds a first preset threshold, an active monitoring signal for DOC sulfur poisoning is acquired. Upon receiving the active monitoring signal for DOC sulfur poisoning, the engine is controlled to perform DOC thermal management.

5. The monitoring method according to claim 1, characterized in that, Controlling engine DOC thermal management includes: The upstream temperature of the DOC before thermal management is obtained. If the upstream temperature of the DOC is greater than a preset temperature threshold, the DOC is cooled down; if the upstream temperature of the DOC is less than or equal to the preset temperature threshold, the DOC is heated.

6. A monitoring device for DOC sulfur poisoning, operated using the monitoring method for DOC sulfur poisoning as described in any one of claims 1 to 5, characterized in that, include: The thermal management unit is used to obtain the initial differential carbon load. When the initial differential carbon load exceeds a first preset threshold, it controls the engine to perform DOC thermal management so that the DPF can be passively regenerated. The first preset threshold represents the maximum value of the cumulative differential carbon load of the DPF under normal conditions. The calculation unit is used to control the engine to inject fuel within a preset time period, obtain the current differential carbon load corresponding to the moment when the engine completes fuel injection, and calculate the absolute value of the difference between the current differential carbon load and the initial differential carbon load to obtain the change in carbon load. The monitoring unit is used to monitor whether sulfur poisoning has occurred in the DOC based on the change in carbon loading.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the DOC sulfur poisoning monitoring method according to any one of claims 1 to 5.

8. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a method for performing a monitoring method for DOC sulfur poisoning as described in any one of claims 1 to 5.

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