Integrated Oxidation Collector Sulfur Poisoning Diagnosis Method and Device

Abstract

This application provides a method and apparatus for determining sulfur poisoning in an integrated sulfur dioxide trap, relating to the field of vehicle aftertreatment technology. When the integrated sulfur dioxide trap is in a passive regeneration state, the method obtains the actual carbon load consumption value within the integrated sulfur dioxide trap and the target carbon load consumption value during the passive regeneration reaction process, and compares the actual carbon load consumption value with the target carbon load consumption value. If the difference between the target carbon load consumption value and the actual carbon load consumption value is greater than or equal to a preset deviation value, it indicates that the current integrated sulfur dioxide trap cannot generate enough NO2 to reduce the carbon load. This determines that a certain amount of sulfur oxides have been captured in the SCR of the aftertreatment system, thus determining sulfur poisoning in the integrated sulfur dioxide trap. This solves the problem of low efficiency in determining sulfur poisoning in vehicle fuel in the prior art and achieves the technical effect of improving the efficiency of determining sulfur poisoning in vehicle fuel.

Description

Technical Field

[0001] This application relates to the field of vehicle aftertreatment technology, specifically to an integrated oxidation trap sulfur poisoning detection method and device. Background Technology

[0002] When diesel engines use high-sulfur fuel, combustion produces a large amount of sulfides such as hydrogen sulfide (H2S) and sulfur dioxide (SO2). These sulfides enter the exhaust aftertreatment system and adsorb onto the catalyst surface, reducing the number of active sites and lowering the catalyst's conversion efficiency. This not only affects the exhaust purification effect but also increases fuel consumption, reduces power, and may even lead to torque and speed limitations in the vehicle.

[0003] Existing methods for determining sulfur poisoning in vehicle fuel mainly include: judging by detecting the catalytic oxidation efficiency of CO by the DOC (diesel particulate filter); if the efficiency is lower than a preset value, DOC sulfur poisoning is determined; monitoring the actual ignition temperature of HC in the DOC; if it is higher than the boundary temperature, DOC sulfur poisoning is determined; in addition, sulfur poisoning can also be determined based on the deterioration of parameters such as the SCR (Selective Catalytic Reduction) conversion efficiency and DPF (diesel particulate filter) pressure differential in the aftertreatment system.

[0004] However, the above methods have some problems. For example, under high exhaust temperatures, the reduction in HC conversion efficiency after DOC sulfur poisoning is not significant, which can easily lead to misdiagnosis. Some methods require additional equipment or complex operating condition settings, increasing costs and operational difficulty. Therefore, judging vehicle fuel sulfur poisoning using the above methods inevitably suffers from high judgment costs and low judgment efficiency. Summary of the Invention

[0005] In view of this, this application provides a method and apparatus for determining sulfur poisoning in an integrated oxidation trap, solving the problem of low efficiency in determining sulfur poisoning in vehicle fuel in the prior art. This application designs a sulfur poisoning determination method based on an integrated oxidation trap, using the difference between the actual carbon load consumption value and the target carbon load consumption value in the integrated oxidation trap to determine sulfur poisoning, thus achieving the technical effect of improving the efficiency of determining sulfur poisoning in vehicle fuel.

[0006] To achieve the above objectives, this application provides the following technical solution: When the integrated oxidation trap is in a passive regeneration state, the actual carbon load consumption value inside the integrated oxidation trap is obtained, wherein the actual carbon load consumption value is obtained by subtracting the first average carbon load during the passive regeneration reaction process from the initial average carbon load entering the integrated oxidation trap; the target carbon load consumption value of the integrated oxidation trap during the passive regeneration reaction process is obtained, wherein the target carbon load consumption value is obtained by subtracting the current carbon load from the initial carbon load just entering the integrated oxidation trap; when the difference between the target carbon load consumption value and the actual carbon load consumption value is greater than or equal to a preset deviation value, sulfur poisoning of the integrated oxidation trap is determined.

[0007] In one embodiment of this application, obtaining the actual carbon load consumption value within an integrated oxidation trap includes: when the integrated oxidation trap is in a passive regeneration state, setting a preset duration carbon load sequence; calculating the average value of the initial carbon load within the preset duration carbon load sequence to obtain an initial average carbon load value; updating the preset duration carbon load sequence based on the passive regeneration reaction within the integrated oxidation trap until the average carbon load value within the preset duration carbon load sequence is in a preset smoothing state, and determining the average carbon load value in the preset smoothing state as a first average carbon load value; obtaining the difference between the initial average carbon load value and the first average carbon load value to obtain the actual carbon load consumption value.

[0008] In one embodiment of this application, obtaining the target carbon load consumption value of an integrated oxidation trap during a passive regeneration reaction includes: obtaining multiple carbon loads corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap; performing an integral operation on the initial carbon load and the multiple carbon loads to obtain the current carbon load; and obtaining the difference between the initial carbon load and the current carbon load to obtain the target carbon load consumption value.

[0009] In one embodiment of this application, the method further includes: obtaining the pressure difference between the exhaust gas inlet port and the exhaust port of the integrated oxidation trap; and calculating the initial carbon loading based on the pressure difference.

[0010] In one embodiment of this application, obtaining multiple carbon loads corresponding to multiple moments during the passive regeneration reaction of an integrated oxidation trap includes: obtaining the exhaust carbon load of the engine at multiple moments and the carbon load consumption value at multiple moments; obtaining the difference between the exhaust carbon load of the engine at multiple moments and the carbon load consumption value at multiple moments to obtain multiple carbon loads corresponding to multiple moments.

[0011] In one embodiment of this application, the method further includes: when the average temperature of the integrated oxidation trap remains within a preset temperature range for a duration exceeding a preset duration, and the current carbon load in the integrated oxidation trap exceeds a preset carbon load, confirming that the integrated oxidation trap is in a passive regeneration range.

[0012] In one embodiment of this application, after determining that the integrated oxidation trap is poisoned by sulfur, the method further includes: triggering a thermal management command to control the desulfurization of the integrated oxidation trap.

[0013] In one embodiment of this application, triggering a thermal management command to control the desulfurization of an integrated oxidation trap includes: raising the temperature inside the integrated oxidation trap to a preset temperature, wherein the preset temperature is the temperature required for desulfurization; and controlling the desulfurization of the integrated oxidation trap at the preset temperature.

[0014] In one embodiment of this application, the method further includes: recording the number of desulfurization cycles of the integrated oxidation trap to obtain the total number of desulfurization cycles; if the total number of desulfurization cycles exceeds the preset number of desulfurization cycles within a preset time, generating a reminder instruction, which is used to remind the user that the engine fuel is poisoned by sulfur and to replace the fuel.

[0015] As a second aspect of this application, this application also provides an integrated sulfur poisoning detection device for an oxidation trap, including a controller for executing the integrated sulfur poisoning detection method for an oxidation trap as described above.

[0016] As a third aspect of this application, this application also provides a vehicle, including: an integrated oxidation trap; an engine; and the aforementioned sulfur poisoning detection device.

[0017] The integrated carbon dioxide trap sulfur poisoning detection method provided in this application, when the integrated carbon dioxide trap is in passive regeneration mode, obtains the actual carbon load consumption value inside the integrated carbon dioxide trap and the target carbon load consumption value of the passive regeneration reaction process, and compares the actual carbon load consumption value with the target carbon load consumption value. If the difference between the target carbon load consumption value and the actual carbon load consumption value is greater than or equal to a preset deviation value, it indicates that the carbon load inside the integrated carbon dioxide trap is high, meaning that the integrated carbon dioxide trap cannot generate enough NO2 to reduce the carbon load. Therefore, it can be determined that a certain amount of sulfur oxides have been captured in the SCR of the aftertreatment system, thus determining that the integrated carbon dioxide trap is sulfur poisoned. By providing an integrated carbon dioxide trap, the method achieves the goal of saving costs by using a catalyst with both DOC and DPF formulations coated in separate sections, thus improving the technical efficiency of detecting sulfur poisoning in vehicle fuel and solving the problem of low efficiency in detecting sulfur poisoning in vehicle fuel in existing technologies. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 The diagram shows a flowchart of a sulfur poisoning determination method for an integrated oxidation trap provided in an embodiment of this application.

[0020] Figure 2 The figure shown is a schematic diagram of a DDPF system provided in an embodiment of this application.

[0021] Figure 3 The diagram shown is a schematic diagram of an integrated sulfur poisoning detection device for an oxidation trap provided in an embodiment of this application.

[0022] Figure 4 The diagram shown is a schematic representation of a vehicle provided in one embodiment of this application. Detailed Implementation

[0023] When diesel engines use high-sulfur fuel, combustion produces a large amount of sulfides such as hydrogen sulfide (H2S) and sulfur dioxide (SO2). These sulfides enter the exhaust aftertreatment system and adsorb onto the catalyst surface, reducing the number of active sites and lowering the catalyst's conversion efficiency. This not only affects the exhaust purification effect but also increases fuel consumption, reduces power, and may even lead to torque and speed limitations in the vehicle.

[0024] Existing methods for determining sulfur poisoning in vehicle fuel mainly include: judging by detecting the catalytic oxidation efficiency of DOC on CO; if the efficiency is lower than a preset value, DOC is judged to be sulfur poisoned; monitoring the actual ignition temperature of HC in DOC; if it is higher than the boundary temperature, DOC is judged to be sulfur poisoned; in addition, sulfur poisoning can also be determined based on the deterioration of parameters such as SCR conversion efficiency and DPF pressure difference in the aftertreatment system.

[0025] However, the above methods have some problems. For example, under high exhaust temperatures, the reduction in HC conversion efficiency after DOC sulfur poisoning is not significant, which can easily lead to misdiagnosis. Some methods require additional equipment or complex operating condition settings, increasing costs and operational difficulty. Therefore, judging vehicle fuel sulfur poisoning using the above methods inevitably suffers from high judgment costs and low judgment efficiency.

[0026] The inventors of this application, through research, propose the following: When the integrated carbon dioxide trap is in passive regeneration mode, by obtaining the actual carbon load consumption value within the integrated carbon dioxide trap and the target carbon load consumption value during the passive regeneration reaction process, and comparing the actual and target carbon load consumption values, if the difference between the target and actual carbon load consumption values ​​is greater than or equal to a preset deviation value, it indicates that the carbon load inside the integrated carbon dioxide trap is currently high. This means that the integrated carbon dioxide trap cannot generate enough NO2 to reduce the carbon load, thus confirming that a certain amount of sulfur oxides have been captured in the SCR system of the aftertreatment system, thereby determining sulfur poisoning in the integrated carbon dioxide trap. By providing a DDPF (integrated carbon dioxide trap), the invention achieves the goal of combining the functions of both DOC-formulated catalysts and DPF-formulated catalysts through partitioned coating, thereby saving costs and improving the technical efficiency of detecting sulfur poisoning in vehicle fuel. This solves the problem of low efficiency in detecting sulfur poisoning in vehicle fuel in existing technologies.

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

[0028] As a first aspect of this application, this application provides a method for determining sulfur poisoning in an integrated oxidation trap. Figure 1 The diagram shown is a flowchart of a sulfur poisoning determination method for an integrated oxidation trap provided in an embodiment of this application. Figure 1 As shown, the method for diagnosing sulfur poisoning includes the following steps:

[0029] S101, when the integrated oxidation trap is in passive regeneration state, the actual carbon load consumption value in the integrated oxidation trap is obtained, wherein the actual carbon load consumption value is obtained by subtracting the first average carbon load during the passive regeneration reaction process from the initial average carbon load entering the integrated oxidation trap.

[0030] Specifically, the aforementioned integrated oxidation trap can be understood as integrating the functions of DPF and DOC, that is, partitioning the catalyst with DOC formulation and the catalyst with DPF formulation, taking into account the functions of both. By integrating the functions of DPF and DOC, the goal of reducing the volume and cost of DOC / DPF system is achieved.

[0031] Figure 2 The diagram shown is a schematic diagram of a DDPF system provided in an embodiment of this application. Figure 2As shown, the DDPF system includes T1, T2, T3 and T4. T1 is a temperature sensor at the DDPF exhaust gas inlet port, T2 is a differential pressure sensor at the two ends of the DDPF exhaust gas inlet port and the exhaust port, T3 is a temperature sensor at the DDPF exhaust gas outlet port, and T4 is the DDPF device.

[0032] The aforementioned passive regeneration process utilizes fuel additives or catalysts to lower the ignition temperature of particulate matter, allowing it to ignite and burn at normal engine exhaust temperatures. This leverages the reaction between NO2 and carbon in the DPF (Diesel Particulate Filter), eliminating carbon trapped in the DPF. The NO2 originates from the pre-filter DOC (Diesel Offset Carbon), and its maximum formation occurs around 350°C. Additives (such as cerium, iron, and strontium) must be added to the fuel in specific proportions. Excessive additives have little impact, but insufficient additives can lead to delayed regeneration or increased regeneration temperature.

[0033] The aforementioned actual carbon load consumption value can be used to represent the actual carbon load consumed in the DDPF. In the embodiments of this application, it can be calculated using the pressure difference between the exhaust gas inlet and outlet ports of the DDPF.

[0034] The aforementioned average initial carbon loading can be used to represent the average carbon loading within the DDPF calculated when the DDPF just enters the passive regeneration zone.

[0035] The aforementioned first average carbon loading can be used to represent the average carbon loading within a smooth fluctuation range calculated after DDPF has entered the passive regeneration range for a period of time. That is, the first average carbon loading varies up and down within the smooth fluctuation range.

[0036] It is important to note that after DDPF enters the passive regeneration zone, the carbon loading at each time point is updated. The average value of the updated carbon loading data is calculated under a fixed data sequence, resulting in multiple output values. When the random fluctuations of these multiple output values ​​gradually become smooth and stable, the output value under this smooth and stable condition is determined to be the average value of the first carbon loading mentioned above. This ensures that the average carbon loading value tends to stabilize after DDPF has been in the passive regeneration zone for a period of time, thereby achieving the purpose of smoothing the data and removing noise. This makes the actual carbon loading consumption value more accurate and facilitates subsequent DDPF sulfur poisoning assessment.

[0037] In one optional embodiment, in order to obtain the actual carbon load consumption value of DDPF in passive regeneration state, the differential pressure sensor at both ends of DDPF can be used to collect the differential pressure at the exhaust gas input port and the exhaust port in real time to obtain the carbon load of DDPF at each moment in passive regeneration state. By averaging the carbon load when DDPF just enters the passive regeneration zone, the above-mentioned initial carbon load average value can be obtained. At the same time, by averaging the carbon load after DDPF has entered the passive regeneration zone for a period of time, the above-mentioned first carbon load average value can be obtained. Then, the difference between the initial carbon load average value and the first carbon load average value can be obtained to obtain the actual carbon load consumption value of DDPF in passive regeneration state.

[0038] S102, obtain the target carbon load consumption value of the integrated oxidation trap in the passive regeneration reaction process, wherein the target carbon load consumption value is obtained by subtracting the current carbon load from the initial carbon load that just entered the integrated oxidation trap.

[0039] Specifically, the aforementioned target carbon loading consumption value can be used to represent the target carbon loading consumed in DDPF. Applied to the embodiments of this application, the target carbon loading consumption value of DDPF in the passive regeneration reaction process can be calculated using a model method.

[0040] The above model method can be understood as a process of integrating the initial carbon loading of DDPF when it just enters the passive regeneration zone and the carbon loading consumed during the passive regeneration reaction.

[0041] The aforementioned initial carbon load can be used to represent the carbon load of the DDPF when it just enters the passive regeneration zone. This initial carbon load can be calculated from the pressure difference between the two ends of the DDPF's exhaust gas inlet and outlet ports.

[0042] The aforementioned current carbon loading can be used to represent the carbon loading at the current moment calculated using the above model method after DDPF has entered the passive regeneration zone for a period of time.

[0043] In an optional embodiment, to obtain the target carbon load consumption value of the DDPF during the passive regeneration reaction process, the initial carbon load can be calculated using the pressure difference between the DDPF's exhaust gas inlet and outlet ports. Simultaneously, by continuously subtracting the carbon load during the passive regeneration reaction process from the initial carbon load, the current carbon load within the DDPF can be obtained. The carbon load during the passive regeneration reaction process can be obtained by integrating the difference between the carbon load entering the DDPF at each time point and the carbon load consumed at each time point during the passive regeneration reaction process. Therefore, given the initial and current carbon loads, the target carbon load consumption value of the DDPF during the passive regeneration reaction process can be obtained by subtracting the current carbon load from the initial carbon load.

[0044] S103, when the difference between the target carbon load consumption value and the actual carbon load consumption value is greater than or equal to the preset deviation value, the integrated oxidation trap is determined to be poisoned by sulfur.

[0045] Specifically, given the actual carbon loading consumption value and the target carbon loading consumption value of DDPF, it is possible to determine whether DDPF has suffered sulfur poisoning based on these values.

[0046] Generally, if the catalyst inside a DDPF does not suffer from sulfur poisoning, the pressure difference across its terminals will typically remain at a relatively stable level. This is because the active sites of the catalyst are not covered or blocked by sulfides, allowing it to function normally and promote the oxidation and combustion of particulate matter, thus maintaining good gas flow. Conversely, if the catalyst suffers from sulfur poisoning, sulfides will deposit on the catalyst surface or within the micropores, blocking the reaction sites and increasing airflow resistance, thereby raising the pressure difference across the DDPF. This increase in pressure difference will further affect the system's operational stability and increase exhaust back pressure.

[0047] The aforementioned preset deviation value can be used to represent the deviation between the preset actual carbon loading consumption value and the target carbon loading consumption value. The degree of sulfur poisoning of DDPF can be determined by the preset deviation value.

[0048] For example, in the absence of sulfur poisoning, the theoretical carbon loading of DDPF might be 0.5 g / ml. However, when sulfur poisoning occurs, the actual carbon loading may be 0.1 g / ml. With a preset deviation value of 0.5 g / ml, since the difference between the theoretical and actual carbon loading is greater than the preset deviation value of 0.5 g / ml, it indicates that sulfur poisoning has occurred at that moment. Generally, since the preset deviation value in this application can determine the degree of sulfur poisoning in DDPF, based on the above example, it can also be considered that when the difference between the theoretical and actual carbon loading is greater than 0.2 g / ml, the degree of sulfur poisoning in DDPF is considered to be relatively severe.

[0049] It should be noted that the above-mentioned preset deviation values ​​are only illustrative examples and can be adjusted according to actual conditions.

[0050] Specifically, since DDPF is located within the passive regeneration temperature range, the pressure difference across the DDPF terminals will decrease significantly when the internal carbon loading exceeds a certain value. However, when the catalyst inside the DDPF is poisoned by sulfur, sufficient NO2 cannot be generated to reduce the carbon loading, and the pressure difference across the DDPF terminals continues to rise. Based on this, this application determines whether DDPF has undergone sulfur poisoning by subtracting the actual carbon loading consumption value from the target carbon loading consumption value. When the difference between the target carbon loading consumption value and the actual carbon loading consumption value is greater than or equal to a preset deviation value, it indicates that DDPF has undergone sulfur poisoning. Furthermore, the degree of sulfur poisoning can be determined based on the preset deviation value.

[0051] The integrated carbon dioxide trap sulfur poisoning detection method provided in this application, when the integrated carbon dioxide trap is in passive regeneration mode, obtains the actual carbon load consumption value inside the integrated carbon dioxide trap and the target carbon load consumption value of the passive regeneration reaction process, and compares the actual carbon load consumption value with the target carbon load consumption value. If the difference between the target carbon load consumption value and the actual carbon load consumption value is greater than or equal to a preset deviation value, it indicates that the carbon load inside the integrated carbon dioxide trap is high, meaning that the integrated carbon dioxide trap cannot generate enough NO2 to reduce the carbon load. Therefore, it can be determined that a certain amount of sulfur oxides have been captured in the SCR of the aftertreatment system, thus determining that the integrated carbon dioxide trap is sulfur poisoned. By providing an integrated carbon dioxide trap, the method achieves the goal of saving costs by using a catalyst with both DOC and DPF formulations coated in separate sections, thus improving the technical efficiency of detecting sulfur poisoning in vehicle fuel and solving the problem of low efficiency in detecting sulfur poisoning in vehicle fuel in existing technologies.

[0052] In one embodiment of this application, obtaining the actual carbon load consumption value within an integrated oxidation trap includes: when the integrated oxidation trap is in a passive regeneration state, setting a preset duration carbon load sequence; calculating the average value of the initial carbon load within the preset duration carbon load sequence to obtain an initial average carbon load value; updating the preset duration carbon load sequence based on the passive regeneration reaction within the integrated oxidation trap until the average carbon load value within the preset duration carbon load sequence is in a preset smoothing state, and determining the average carbon load value in the preset smoothing state as a first average carbon load value; obtaining the difference between the initial average carbon load value and the first average carbon load value to obtain the actual carbon load consumption value.

[0053] Specifically, the aforementioned preset duration carbon loading sequence can be used to represent the carbon loading value at each moment within a preset time period. For example, it can be the carbon loading value at each moment within 60 seconds or the carbon loading value at each moment within 70 seconds. Here, the preset duration carbon loading sequence is not specifically set, but can be adjusted according to the actual situation.

[0054] The aforementioned preset smooth state can be used to represent the fluctuation state of the average carbon loading output during the preset DDPF passive regeneration reaction process.

[0055] After the preset duration carbon loading sequence, multiple carbon loading values ​​that initially filled the preset duration sequence when DDPF entered the passive regeneration reaction can be obtained, and the average value of the multiple carbon loading values ​​can be calculated to obtain the above-mentioned initial carbon loading average value.

[0056] Then, with the passive regeneration reaction inside the DDPF, the carbon loading sequence of the preset duration is updated. For example, if the preset duration sequence is 60s, the carbon loading at each time from t1 to t60 within these 60s can be updated. After the corresponding carbon loading is filled within the preset duration sequence of 60s, the carbon loading filled within the 60s is updated according to the first-in-first-out principle, that is, the carbon loading at each time from t1 to t60 is filled again. This cycle is repeated, and the average carbon loading within each cycle of 60s is calculated to obtain the average carbon loading output of each cycle. Then, the average carbon loading values ​​of multiple carbon loading values ​​are filtered to obtain the average carbon loading value corresponding to the preset smoothing state. This average carbon loading value is determined as the first average carbon loading value mentioned above.

[0057] Specifically, when obtaining the carbon load corresponding to each moment within the aforementioned preset time sequence, it can be calculated using the pressure difference between the two ends of the DDPF's exhaust gas input port and exhaust port.

[0058] Therefore, after obtaining the initial average carbon loading and the first average carbon loading, the difference between the initial average carbon loading and the first average carbon loading can be used to obtain the actual carbon loading consumption value mentioned above.

[0059] In one embodiment of this application, obtaining the target carbon load consumption value of an integrated oxidation trap during a passive regeneration reaction includes: obtaining multiple carbon loads corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap; performing an integral operation on the initial carbon load and the multiple carbon loads to obtain the current carbon load; and obtaining the difference between the initial carbon load and the current carbon load to obtain the target carbon load consumption value.

[0060] Specifically, the aforementioned carbon loadings can be obtained by subtracting the carbon loadings consumed at the corresponding time from the carbon loadings input into the DDPF at multiple times.

[0061] The aforementioned current carbon loading is used to characterize the carbon loading inside the DDPF at the current moment. It can be obtained by continuously subtracting the carbon loading during the passive regeneration process from the initial carbon loading. The carbon loading during the passive regeneration process can be obtained by integrating the difference between the carbon loading entering the DDPF at each moment and the carbon loading consumed at each moment during the passive regeneration process.

[0062] In an optional embodiment, in order to obtain the theoretical carbon load consumed by DDPF when it enters the passive regeneration zone, the initial carbon load of DDPF when it just enters the passive regeneration reaction can be obtained. As the passive regeneration reaction continues, the carbon load accumulated during the passive regeneration reaction can be continuously subtracted from the initial carbon load to obtain the carbon load inside DDPF at the current moment. Then, the target carbon load consumption value, which is the theoretical carbon load consumed, can be obtained by subtracting the initial carbon load from the current carbon load.

[0063] In one embodiment of this application, the method further includes: obtaining the pressure difference between the exhaust gas inlet port and the exhaust port of the integrated oxidation trap; and calculating the initial carbon loading based on the pressure difference.

[0064] Specifically, to calculate the initial carbon load of the DDPF based on the pressure difference between its two ends, the following methods can be used: Establish a model relating pressure difference to carbon load, i.e., conduct experiments on an engine test bench to obtain the correspondence between the pressure difference across the DDPF and the exhaust gas flow rate under different carbon loads (MAP diagram), and establish a carbon load model based on the pressure difference using these data; measure real-time data, in actual operation, by using sensors to measure the pressure difference across the DDPF and the exhaust gas flow rate in real time; calculate the carbon load, based on the real-time measured pressure difference and exhaust gas flow rate, combined with the established model, by interpolation or by directly querying the MAP diagram to estimate the initial carbon load.

[0065] Furthermore, to improve accuracy, a confidence factor can be introduced to assess the changes in carbon loading under different operating conditions. For example, by measuring the pressure difference characteristics (PV1) under high smoke emission rate and low passive regeneration rate, and the pressure difference characteristics (PV2) under low smoke emission rate and high passive regeneration rate, the confidence factor f is calculated, and the carbon loading calculation is adjusted according to the formula PV=PV1×f+PV2×(1−f).

[0066] In one embodiment of this application, obtaining multiple carbon loads corresponding to multiple moments during the passive regeneration reaction of an integrated oxidation trap includes: obtaining the exhaust carbon load of the engine at multiple moments and the carbon load consumption value at multiple moments; obtaining the difference between the exhaust carbon load of the engine at multiple moments and the carbon load consumption value at multiple moments to obtain multiple carbon loads corresponding to multiple moments.

[0067] Specifically, the carbon load emitted by the aforementioned engine can be obtained through the relationship between the pressure difference across the DDPF and the exhaust gas flow rate (MAP diagram).

[0068] In one optional embodiment, in order to obtain multiple carbon loads corresponding to multiple moments during the passive regeneration reaction of the DDPF, the exhaust carbon load of the engine at multiple moments can be obtained through the correspondence between the pressure difference across the DDPF and the exhaust gas flow rate (MAP diagram). At the same time, the carbon load consumption values ​​at multiple moments calculated through the passive regeneration reaction can be obtained. After knowing the exhaust carbon load of the engine and the carbon load consumption values ​​in the DDPF at multiple moments, the multiple carbon loads corresponding to multiple moments can be obtained by subtracting the carbon load consumption values ​​at multiple moments from the exhaust carbon load of the engine at multiple moments.

[0069] In one embodiment of this application, the method further includes: when the average temperature of the integrated oxidation trap remains within a preset temperature range for a duration exceeding a preset duration, and the current carbon load in the integrated oxidation trap exceeds a preset carbon load, confirming that the integrated oxidation trap is in a passive regeneration range.

[0070] Specifically, the above-mentioned average temperature can be obtained through Figure 2 The weighted average of the inlet temperature collected by T1 and the outlet temperature collected by T2 is calculated to obtain the result.

[0071] The aforementioned preset temperature range can be used to represent the preset average temperature of DDPF, which can be 280℃ or 300℃. The preset temperature range is not specifically set here, but can be adjusted according to the actual situation.

[0072] The aforementioned preset duration can be used to indicate the time during which the average temperature of the DDPF exceeds the preset temperature range. It can be 3 seconds or 4 seconds. The preset duration is not specifically set here and can be adjusted according to the actual situation.

[0073] The preset carbon loading mentioned above can be used to represent the current carbon loading in the preset DDPF. Generally, it can be 2g or 3g. Here, the preset carbon loading is not specifically set, but can be adjusted according to the actual situation.

[0074] In one optional embodiment, determining whether DDPF has suffered sulfur poisoning requires evaluation after the DDPF has entered the passive regeneration zone. Therefore, it is first necessary to confirm whether the DDPF has entered the passive regeneration zone. Specifically, this application makes the determination based on the average temperature of the DDPF and its current carbon loading. If the average temperature of the DDPF remains within a preset temperature range for a duration exceeding a preset duration, and the current carbon loading within the DDPF exceeds a preset carbon loading, the DDPF is confirmed to be in the passive regeneration zone.

[0075] In one embodiment of this application, after determining that the integrated oxidation trap is poisoned by sulfur, the method further includes: triggering a thermal management command to control the desulfurization of the integrated oxidation trap.

[0076] Specifically, the aforementioned thermal management mode can be used to represent desulfurization control by heating the temperature inside the DDPF.

[0077] Generally, when DDPF suffers from sulfur poisoning, sulfides deposit on the catalyst surface or within the micropores, causing the active sites of the catalyst to be covered or blocked. This not only reduces the catalytic efficiency of the catalyst but also increases exhaust back pressure, affecting engine performance and exhaust gas purification effects. Therefore, desulfurization control of DDPF is necessary to restore catalyst activity and ensure the normal operation of the exhaust gas treatment system.

[0078] Common methods for desulfurization control of DDPF include, but are not limited to, the following: high-temperature regeneration, which increases exhaust temperature to desorb or decompose sulfides from the catalyst surface. For example, controlling the post-injection amount of fuel in the engine to raise the exhaust temperature to a certain value (e.g., 500-600°C) and maintain it for a period of time (e.g., 20 minutes) to achieve desulfurization; chemical reduction, which injects a reducing agent (e.g., ammonia or urea) into the exhaust to reduce sulfides to gaseous hydrogen sulfide or other volatile substances, thereby desorbing them from the catalyst surface; air-fuel ratio control, which adjusts the engine's air-fuel ratio to alternate between rich and lean air-fuel ratios. A rich air-fuel ratio helps reduce sulfides, while a lean air-fuel ratio helps burn particulate matter, preventing excessive accumulation of particulate matter in DDPF; and activated carbon adsorption and regeneration, which uses activated carbon as a desulfurization filter to adsorb SO2 in the exhaust gas. When the activated carbon is saturated with adsorption, it is regenerated by high temperature (500-600°C) to decompose the adsorbed H2SO4 into SO2 and water vapor. At the same time, the particulate matter is burned at high temperature, thus regenerating the filter element.

[0079] In one embodiment of this application, triggering a thermal management command to control the desulfurization of an integrated oxidation trap includes: raising the temperature inside the integrated oxidation trap to a preset temperature, wherein the preset temperature is the temperature required for desulfurization; and controlling the desulfurization of the integrated oxidation trap at the preset temperature.

[0080] Specifically, the aforementioned preset temperature can be used to represent the pre-set temperature at which the sulfides inside DDPF are decomposed. For example, it can be 500℃, 550℃, or 600℃, etc. The preset temperature is not specifically set here, but can be adjusted according to the actual situation.

[0081] In one alternative embodiment, desulfurization control of the integrated oxidation trap is performed based on a triggered thermal management command. This can be achieved by raising the temperature inside the DDPF to a temperature at which the sulfides inside the DDPF decompose, thereby controlling the desulfurization of the sulfides inside the DDPF at that temperature.

[0082] In one embodiment of this application, the method further includes: recording the number of desulfurization cycles of the integrated oxidation trap to obtain the total number of desulfurization cycles; if the total number of desulfurization cycles exceeds the preset number of desulfurization cycles within a preset time, generating a reminder instruction, which is used to remind the user that the engine fuel is poisoned by sulfur and to replace the fuel.

[0083] Specifically, the aforementioned preset desulfurization number of times can be used to indicate the number of times DDPF will be desulfurized. Generally, it can be 3 times or 4 times. Here, the specific preset desulfurization number of times is not set, but can be adjusted according to the actual situation.

[0084] When recording the number of DDPF desulfurization operations, the engine control unit or aftertreatment system control unit can be used to record each desulfurization process to obtain the total number of desulfurization operations mentioned above. Alternatively, a professional diagnostic tool (such as an OBD-II scanning tool) can be connected to the vehicle's diagnostic interface to read the regeneration and desulfurization-related parameters of the DDPF. These tools can display historical data, including the number of desulfurization operations. Another method is to record the time and conditions of each desulfurization operation through the vehicle's remote monitoring system or on-board information system, and periodically export the data for statistics. Here, no single method for desulfurization statistics is specified.

[0085] In one optional embodiment, in addition to desulfurizing DDPF, it is also necessary to count the number of times DDPF is desulfurized, that is, to obtain the total number of times desulfurization is mentioned above. If the total number of times desulfurization exceeds the preset number of times desulfurization within a certain period of time, it indicates that DDPF desulfurization is relatively frequent, indicating that the sulfur content of the fuel is continuously too high, and frequent desulfurization cannot completely solve the problem. Therefore, when the total number of times desulfurization exceeds the preset number of times desulfurization, a reminder command can be generated to remind the user that the engine fuel is poisoned by sulfur and to replace the fuel, thereby fundamentally reducing the risk of sulfur poisoning.

[0086] As a second aspect of this application, this application also provides an integrated sulfur poisoning detection device for an oxidation trap. Figure 3 The diagram shown is a schematic of an integrated sulfur poisoning detection device for an oxidation trap provided in an embodiment of this application. Figure 3 As shown, the sulfur poisoning detection device 3 includes: a controller 31, which is used to execute the integrated oxidation trap sulfur poisoning detection method described above.

[0087] As a third aspect of this application, this application also provides a vehicle, Figure 4The diagram shown is a schematic representation of a vehicle provided in one embodiment of this application. Figure 4 As shown, the vehicle includes: an integrated oxidation trap 41; an engine 42; and the aforementioned sulfur poisoning detection device 3. The integrated oxidation trap 41 is connected to the engine 42 and is used to after-treat the exhaust gas discharged from the engine 42. The sulfur poisoning detection device 3 is connected to the integrated oxidation trap 41 and is used to perform the integrated oxidation trap sulfur poisoning detection method described above.

[0088] The integrated carbon dioxide trap sulfur poisoning detection method provided in this application, when the integrated carbon dioxide trap is in passive regeneration mode, obtains the actual carbon load consumption value inside the integrated carbon dioxide trap and the target carbon load consumption value of the passive regeneration reaction process, and compares the actual carbon load consumption value with the target carbon load consumption value. If the difference between the target carbon load consumption value and the actual carbon load consumption value is greater than or equal to a preset deviation value, it indicates that the carbon load inside the integrated carbon dioxide trap is high, meaning that the integrated carbon dioxide trap cannot generate enough NO2 to reduce the carbon load. Therefore, it can be determined that a certain amount of sulfur oxides have been captured in the SCR of the aftertreatment system, thus determining that the integrated carbon dioxide trap is sulfur poisoned. By providing an integrated carbon dioxide trap, the method achieves the goal of saving costs by using a catalyst with both DOC and DPF formulations coated in separate sections, thus improving the technical efficiency of detecting sulfur poisoning in vehicle fuel and solving the problem of low efficiency in detecting sulfur poisoning in vehicle fuel in existing technologies.

[0089] The methods in this application can be implemented, in whole or in part, by software, hardware, firmware, or any combination thereof. When implemented in software, they can be implemented, in whole or in part, as a computer program product. This computer program product includes one or more computer programs or instructions that, when loaded and executed on a computer, perform, in whole or in part, the processes or functions described in this application. The computer can be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, core network equipment, OAM (Operational Information Management), or other programmable devices.

[0090] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0091] The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; or an optical medium, such as a digital video optical disc; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0092] Furthermore, embodiments of this application may also be storage media storing a computer program, which is executed by a processor of the steps in the integrated oxidizer sulfur poisoning determination method described in any of the above embodiments of this specification.

[0093] For the foregoing method embodiments, in order to simplify the description, they are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0094] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0095] The steps in the methods of the various embodiments of this application can be adjusted, combined, or deleted according to actual needs, and the technical features described in each embodiment can be replaced or combined. The apparatuses in the various embodiments of this application can be combined, divided, or deleted according to actual needs.

[0096] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0097] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software unit executed by a processor, or a combination of both. The software unit can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0098] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, 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 said element.

[0099] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining sulfur poisoning in an integrated oxidation trap, characterized in that, include: When the integrated oxidation trap is in passive regeneration state, the actual carbon load consumption value inside the integrated oxidation trap is obtained, wherein the actual carbon load consumption value is obtained by subtracting the first average carbon load during the passive regeneration reaction process from the initial average carbon load entering the integrated oxidation trap. The step of obtaining the actual carbon load consumption value within the integrated oxidant trap includes: when the integrated oxidant trap is in a passive regeneration state, setting a preset duration carbon load sequence; calculating the average value of the initial carbon load within the preset duration carbon load sequence to obtain the initial average carbon load value; updating the preset duration carbon load sequence based on the passive regeneration reaction within the integrated oxidant trap until the average carbon load value within the preset duration carbon load sequence is in a preset smoothing state, determining the average carbon load value in the preset smoothing state as the first average carbon load value; and obtaining the difference between the initial average carbon load value and the first average carbon load value to obtain the actual carbon load consumption value. The target carbon load consumption value of the integrated oxidation trap during the passive regeneration reaction process is obtained, wherein the target carbon load consumption value is obtained by subtracting the current carbon load from the initial carbon load just entering the integrated oxidation trap. The step of obtaining the target carbon load consumption value of the integrated oxidation trap during the passive regeneration reaction process includes: obtaining multiple carbon loads corresponding to multiple moments during the passive regeneration reaction process of the integrated oxidation trap; performing an integral operation on the initial carbon load and the multiple carbon loads to obtain the current carbon load; and obtaining the difference between the initial carbon load and the current carbon load to obtain the target carbon load consumption value. When the difference between the target carbon load consumption value and the actual carbon load consumption value is greater than or equal to a preset deviation value, the integrated oxidation trap is determined to be poisoned by sulfur.

2. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 1, characterized in that, The method further includes: Obtain the pressure difference between the exhaust gas inlet and outlet ports of the integrated oxidation trap; The initial carbon loading is calculated based on the pressure difference between the two ends.

3. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 1, characterized in that, The acquisition of multiple carbon loadings at multiple moments during the passive regeneration reaction of the integrated oxidation trap includes: Obtain the engine's carbon load emissions at multiple time points, as well as the carbon load consumption values ​​at multiple time points; The difference between the engine's exhaust carbon load at multiple time points and the carbon load consumption value at those multiple time points is obtained to obtain multiple carbon loads corresponding to those multiple time points.

4. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 1, characterized in that, The method further includes: When the average temperature of the integrated oxidation trap remains within the preset temperature range for a duration exceeding the preset duration, and the current carbon load within the integrated oxidation trap exceeds the preset carbon load, it is confirmed that the integrated oxidation trap is in the passive regeneration zone.

5. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 1, characterized in that, After determining that the integrated oxidation trap is poisoned by sulfur, the method further includes: The thermal management command is triggered to control the desulfurization of the integrated oxidation trap.

6. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 5, characterized in that, The triggering thermal management command controls the desulfurization of the integrated oxidation trap, including: The temperature inside the integrated oxidation trap is raised to a preset temperature, wherein the preset temperature is the temperature required for desulfurization; Desulfurization control is performed on the integrated oxidation trap at the preset temperature.

7. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 5, characterized in that, The method further includes: The number of desulfurization cycles of the integrated oxidation trap was recorded to obtain the total number of desulfurization cycles; If the total number of desulfurization cycles exceeds the preset number of desulfurization cycles within a preset time, a reminder instruction is generated. The reminder instruction is used to remind the user that the engine fuel is poisoned by sulfur and to replace the fuel.

8. An integrated sulfur poisoning detection device for an oxidation trap, characterized in that, Includes a controller for executing the integrated oxidation trap sulfur poisoning determination method according to any one of claims 1 to 7.

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