Method and device for judging sulfur poisoning of integrated oxidation trap

Abstract

The invention provides a sulfur poisoning judgment method and device for an integrated oxidation trap, and relates to the technical field of vehicle post-processing. When the integrated oxidation trap is in a passive regeneration state, the actual carbon load consumption value in the integrated oxidation trap and the target carbon load consumption value in the passive regeneration reaction process are obtained; the actual carbon load consumption value is compared with the target carbon load consumption value, and under the condition that a difference value obtained by subtracting the actual carbon load consumption value from the target carbon load consumption value is smaller than or equal to a preset deviation value, it is indicated that sufficient NO2 cannot be generated in the current integrated oxidation trap to reduce the carbon load; therefore, it can be determined that certain sulfur oxides are trapped in the SCR in the aftertreatment system, and then sulfur poisoning of the integrated oxidation trap is determined, so that the problem that in the prior art, the vehicle fuel oil sulfur poisoning judgment efficiency is low is solved, and the technical effect of improving the vehicle fuel oil sulfur poisoning judgment efficiency is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle aftertreatment, and particularly relates to a method and device for judging sulfur poisoning of an integrated oxidation trap. Background Art

[0002] When a diesel engine uses high-sulfur fuel, a large amount of sulfides such as hydrogen sulfide (H2S) and sulfur dioxide (SO2) will be generated during combustion. These sulfides enter the exhaust gas aftertreatment system and will adsorb on the surface of the catalyst, resulting in a reduction in the number of active sites, reducing the conversion efficiency of the catalyst. This not only affects the exhaust gas purification effect, but also increases fuel consumption, reduces power, and even causes vehicle torque and speed limitation.

[0003] The existing methods for judging sulfur poisoning of vehicle fuel mainly include: judging by detecting the catalytic oxidation efficiency of DOC (diesel particulate filter) for CO. If the efficiency is lower than the preset value, it is judged that DOC is sulfur poisoned; the actual light-off temperature of HC in DOC can also be monitored. If it is higher than the boundary temperature, it is determined that DOC is sulfur poisoned; in addition, it can also be determined according to the deterioration of parameters such as the conversion efficiency of SCR (Selective catalyst reduction) and the differential pressure of DPF (diesel particulate filter) in the aftertreatment system.

[0004] However, there are some problems in the above methods. For example, the reduction of HC conversion efficiency after DOC sulfur poisoning is not obvious under high exhaust temperature conditions, which is prone to misjudgment; some methods require additional equipment or complex working conditions setting, increasing the cost and operation difficulty. Therefore, there are inevitably problems of high judgment cost and low judgment efficiency in judging vehicle fuel sulfur poisoning by the above methods. Summary of the Invention

[0005] In view of this, the present application provides a method and device for judging sulfur poisoning of an integrated oxidation trap, which solves the problem of low efficiency in judging sulfur poisoning of vehicle fuel in the prior art. The present application designs a method for judging sulfur poisoning based on an integrated oxidation trap, and judges sulfur poisoning by comparing the difference between the actual carbon loading consumption value and the target carbon loading consumption value in the integrated oxidation trap, achieving the technical effect of improving the judgment efficiency of vehicle fuel sulfur poisoning.

[0006] To achieve the above object, the present application provides the following technical solutions: When the integrated oxidation trap is in the passive regeneration state, obtain the actual carbon loading consumption value in the integrated oxidation trap, where the actual carbon loading consumption value is obtained by subtracting the average value of the first carbon loading during the passive regeneration reaction from the average value of the initial carbon loading entering the integrated oxidation trap; obtain the target carbon loading consumption value during the passive regeneration reaction of the integrated oxidation trap, where the target carbon loading consumption value is obtained by subtracting the current carbon loading from the initial carbon loading just entering the integrated oxidation trap; when the difference obtained by subtracting the actual carbon loading consumption value from the target carbon loading consumption value is less than or equal to the preset deviation value, determine that the integrated oxidation trap is sulfur poisoned.

[0007] In an embodiment of the present application, obtaining the actual carbon loading consumption value in the integrated oxidation trap includes: When the integrated oxidation trap is in the passive regeneration state, set a carbon loading sequence for a preset duration; calculate the average value of the initial carbon loading in the carbon loading sequence for the preset duration to obtain the average value of the initial carbon loading; based on the passive regeneration reaction in the integrated oxidation trap, update the carbon loading sequence for the preset duration until the average value of the carbon loading in the carbon loading sequence for the preset duration is in a preset smooth state, and determine the average value of the carbon loading in the preset smooth state as the average value of the first carbon loading; obtain the difference between the average value of the initial carbon loading and the average value of the first carbon loading to obtain the actual carbon loading consumption value.

[0008] In an embodiment of the present application, obtaining the target carbon loading consumption value during the passive regeneration reaction of the integrated oxidation trap includes: obtaining multiple carbon loadings corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap; performing an integration operation on the initial carbon loading and the multiple carbon loadings to obtain the current carbon loading; obtaining the difference between the initial carbon loading and the current carbon loading to obtain the target carbon loading consumption value.

[0009] In an embodiment of the present application, the method further includes: obtaining the pressure difference between the two ends of the exhaust gas inlet port and the exhaust port of the integrated oxidation trap; calculating the initial carbon loading according to the pressure difference between the two ends.

[0010] In an embodiment of the present application, obtaining multiple carbon loadings corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap includes: obtaining the exhaust carbon loading of the engine at multiple moments, and the carbon loading consumption values at multiple moments; obtaining the difference between the exhaust carbon loading of the engine at multiple moments and the carbon loading consumption values at multiple moments to obtain multiple carbon loadings corresponding to multiple moments.

[0011] In one embodiment of the present application, the method further includes: when the average temperature of the integrated oxidation trap continues to be within a preset temperature range, and the duration exceeds a preset duration, and the current carbon loading in the integrated oxidation trap exceeds a preset carbon loading, it is confirmed that the integrated oxidation trap is in the passive regeneration range.

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

[0013] In one embodiment of the present application, triggering a thermal management instruction to perform desulfurization control on the integrated oxidation trap includes: raising the temperature in the integrated oxidation trap to a preset temperature, where the preset temperature is the temperature required for desulfurization; performing desulfurization control on the integrated oxidation trap at the preset temperature.

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

[0015] As a second aspect of the present application, the present application further provides an integrated oxidation trap sulfur poisoning judgment device, including a controller, and the controller is used to execute the integrated oxidation trap sulfur poisoning judgment method of any one of the above.

[0016] As a third aspect of the present application, the present application further provides a vehicle, including: an integrated oxidation trap; an engine; and the above sulfur poisoning judgment device.

[0017] The integrated oxidation trap sulfur poisoning judgment method provided by the present application, when the integrated oxidation trap is in the passive regeneration state, by obtaining the actual carbon loading consumption value in the integrated oxidation trap and the target carbon loading consumption value in the passive regeneration reaction process, and comparing the actual carbon loading consumption value with the target carbon loading consumption value, when the difference obtained by subtracting the actual carbon loading consumption value from the target carbon loading consumption value is less than or equal to a preset deviation value, it indicates that the current carbon loading inside the integrated oxidation trap is relatively high, that is, not enough NO2 can be generated inside the current integrated oxidation trap to reduce the carbon loading. From this, it can be determined that a certain amount of sulfur oxides are trapped in the SCR in the after-treatment system, and further determine that the integrated oxidation trap is sulfur poisoned. By providing the integrated oxidation trap, the purpose of saving costs is achieved by integrating the catalyst with DOC formula and the catalyst with DPF formula, and the technical effect of improving the judgment efficiency of vehicle fuel sulfur poisoning is achieved, thereby solving the problem of low judgment efficiency of vehicle fuel sulfur poisoning in the prior art. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0019] Figure 1 The figure shows a flowchart of a method for judging sulfur poisoning of an integrated oxidation trap according to an embodiment of the present application.

[0020] Figure 2 The figure shows a system schematic diagram of a DDPF according to an embodiment of the present application.

[0021] Figure 3 The figure shows a schematic diagram of a device for judging sulfur poisoning of an integrated oxidation trap according to an embodiment of the present application.

[0022] Figure 4 The figure shows a schematic diagram of a vehicle according to an embodiment of the present application. Detailed implementation manners

[0023] When a diesel engine uses high-sulfur fuel, a large amount of sulfides such as hydrogen sulfide (H2S) and sulfur dioxide (SO2) will be generated during combustion. These sulfides enter the exhaust gas aftertreatment system and will adsorb on the surface of the catalyst, resulting in a reduction in the number of active sites, reducing the conversion efficiency of the catalyst. This not only affects the exhaust gas purification effect but also increases fuel consumption, reduces power, and even causes vehicle torque and speed limitation.

[0024] The existing methods for judging vehicle fuel sulfur poisoning mainly include: judging by detecting the catalytic oxidation efficiency of DOC for CO. If the efficiency is lower than the preset value, it is judged that DOC is sulfur poisoned; the actual light-off temperature of HC of DOC can also be monitored. If it is higher than the boundary temperature, it is determined that DOC is sulfur poisoned; in addition, it can also be determined according to the deterioration of parameters such as the SCR conversion efficiency and DPF differential pressure in the aftertreatment system.

[0025] However, there are some problems with the above methods. For example, when DOC is sulfur poisoned at high exhaust gas temperatures, the reduction in HC conversion efficiency is not obvious, which is prone to misjudgment; some methods require additional equipment or complex operating conditions settings, increasing costs and operating difficulties. Therefore, there are inevitably problems of high judgment cost and low judgment efficiency in judging vehicle fuel sulfur poisoning by the above methods.

[0026] After research, the inventors of the present application proposed that when the integrated oxidation trap is in the passive regeneration state, by obtaining the actual carbon loading consumption value in the integrated oxidation trap and the target carbon loading consumption value in the passive regeneration reaction process, and comparing the actual carbon loading consumption value with the target carbon loading consumption value, when the difference obtained by subtracting the actual carbon loading consumption value from the target carbon loading consumption value is less than or equal to the preset deviation value, it indicates that the carbon loading inside the current integrated oxidation trap is relatively high, that is, not enough NO2 can be generated inside the current integrated oxidation trap to reduce the carbon loading. Thus, it can be determined that a certain amount of sulfur oxides are trapped in the SCR in the aftertreatment system, and further determine that the integrated oxidation trap is sulfur poisoned. By providing the DDPF (integrated oxidation trap), the purpose of saving costs is achieved by partitioning and coating the catalysts of the DOC formula and the DPF formula, taking into account both functions, and further achieving the technical effect of improving the judgment efficiency of vehicle fuel sulfur poisoning, thereby solving the problem of low judgment efficiency of vehicle fuel sulfur poisoning in the prior art.

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0028] As the first aspect of the present application, the present application provides a method for judging sulfur poisoning of an integrated oxidation trap. Figure 1 The following shows a flowchart of the method for judging sulfur poisoning of an integrated oxidation trap provided by an embodiment of the present application. As Figure 1 shown, the method for judging sulfur poisoning includes the following steps: S101, when the integrated oxidation trap is in the passive regeneration state, obtain the actual carbon loading consumption value in the integrated oxidation trap, where the actual carbon loading consumption value is obtained by subtracting the average value of the first carbon loading during the passive regeneration reaction from the average value of the initial carbon loading entering the integrated oxidation trap; Specifically, the above-mentioned integrated oxidation trap can be understood as integrating the functions of the DPF and DOC, that is, partitioning and coating the catalysts of the DOC formula and the DPF formula, taking into account both functions. By integrating the functions of the DPF and DOC, the purpose of reducing the volume and cost of the DOC / DPF system is achieved.

[0029] Figure 2 The following shows a system schematic diagram of the DDPF provided by an embodiment of the present application. As Figure 2As shown in the figure, the DDPF system includes T1, T2, T3, and T4. Among them, T1 is the temperature sensor at the DDPF tail gas discharge port, T2 is the differential pressure sensor at both ends of the DDPF tail gas discharge port and the discharge port, T3 is the temperature sensor at the DDPF tail gas discharge port, and T4 is the DDPF device.

[0030] The above passive regeneration state means using fuel additives or catalysts to lower the ignition temperature of particulate matter, so that the particulate matter can ignite and burn at the normal engine exhaust temperature. That is, using the principle of the reaction between NO2 and carbon in the DPF to eliminate the carbon intercepted in the DPF carbon. The NO2 comes from the pre-mounted DOC, and the maximum proportion of NO2 generation is around 350°C. Usually, additives (such as cerium, iron, and strontium) need to be added to the fuel in a certain proportion. Too much additive has little impact, but if too little, it will cause regeneration delay or an increase in the regeneration temperature.

[0031] The above actual carbon loading consumption value can be used to represent the actually consumed carbon loading in the DDPF. Applied to the embodiments of the present application, it can be calculated through the differential pressure at both ends of the tail gas input port and the discharge port of the DDPF.

[0032] The above initial average carbon loading can be used to represent the average value of the carbon loading in the DDPF calculated when the DDPF just enters the passive regeneration range.

[0033] The above first average carbon loading can be used to represent the average value of the carbon loading in the smooth fluctuation range calculated after the DDPF enters the passive regeneration range for a period of time. That is, the first average carbon loading changes up and down within the smooth fluctuation range.

[0034] It should be noted that after the DDPF enters the passive regeneration range, the carbon loading at each moment is updated, and the average value of the updated carbon loading data is calculated under a fixed data sequence. As a result, multiple output values can be obtained. When the random fluctuations of the multiple output values gradually tend to be smooth and stable, the output value under this smooth and stable state is determined as the above first average carbon loading, so as to ensure that the average value of the carbon loading after the DDPF enters the passive regeneration range for a period of time tends to be stable, so as to achieve the purpose of removing noise from smooth data, and further make the obtained actual carbon loading consumption value more accurate, which is convenient for subsequent DDPF sulfur poisoning judgment.

[0035] In an alternative embodiment, in order to obtain the actual carbon loading consumption value of the DDPF in the passive regeneration state, the differential pressure sensor at both ends of the DDPF can be used to collect the differential pressure at both ends of the exhaust gas input port and the discharge port in real time, so as to obtain the carbon loading corresponding to each moment of the DDPF in the passive regeneration state. By calculating the average value of the carbon loading when the DDPF just enters the passive regeneration range, the above-mentioned average initial carbon loading can be obtained. At the same time, by calculating the average value of the carbon loading after the DDPF has entered the passive regeneration range for a period of time, the above-mentioned first carbon loading average value can be obtained. Furthermore, by obtaining the difference between the average initial carbon loading and the first carbon loading average value, the actual carbon loading consumption value of the DDPF in the passive regeneration state can be obtained.

[0036] S102. Obtain the target carbon loading consumption value of the integrated oxidation trap during the passive regeneration reaction, where the target carbon loading consumption value is obtained by subtracting the current carbon loading from the initial carbon loading when just entering the integrated oxidation trap; Specifically, the above-mentioned target carbon loading consumption value can be used to represent the target carbon loading consumed in the DDPF. Applied to the embodiments of the present application, the target carbon loading consumption value of the DDPF during the passive regeneration reaction can be calculated according to the model method.

[0037] The above-mentioned model method can be understood as a process of performing integral operation on the initial carbon loading when the DDPF just enters the passive regeneration range and the carbon loading consumed during the passive regeneration reaction.

[0038] The above-mentioned initial carbon loading can be used to represent the carbon loading when the DDPF just enters the passive regeneration range, and this initial carbon loading can be calculated through the differential pressure at both ends of the exhaust gas input port and the discharge port of the DDPF.

[0039] The above-mentioned current carbon loading can be used to represent the carbon loading at the current moment calculated by using the above-mentioned model method after the DDPF has entered the passive regeneration range for a period of time.

[0040] In an alternative embodiment, in order to obtain the target carbon loading consumption value of the DDPF during the passive regeneration reaction, the above-mentioned initial carbon loading can be calculated through the differential pressure at both ends of the exhaust gas input port and the discharge port of the DDPF. At the same time, by continuously subtracting the carbon loading during the passive regeneration reaction from the above-mentioned initial carbon loading, the carbon loading in the DDPF at the current moment can be obtained, where the carbon loading during the above-mentioned passive regeneration reaction can be obtained by integrating the difference obtained by subtracting the consumed carbon loading at each moment during the passive regeneration reaction from the carbon loading entering the DDPF at each moment. Furthermore, in the case of obtaining the initial carbon loading and the current carbon loading, the target carbon loading consumption value of the DDPF during the passive regeneration reaction can be obtained by subtracting the current carbon loading from the initial carbon loading.

[0041] S103. When the difference obtained by subtracting the actual carbon loading consumption value from the target carbon loading consumption value is less than or equal to a preset deviation value, it is determined that the integrated oxidation trap is sulfur poisoned.

[0042] Specifically, when obtaining the actual carbon loading consumption value and the target carbon loading consumption value of the DDPF, it is possible to determine whether the DDPF is sulfur poisoned based on the above actual carbon loading consumption value and the target carbon loading consumption value.

[0043] Generally, if the catalyst inside the DDPF is not sulfur poisoned, the pressure difference across its two ends usually remains at a relatively stable level. This is because the active sites of the catalyst are not covered or blocked by sulfides and can normally play a catalytic role to promote the oxidation and combustion of particulate matter, thus maintaining good gas flow. On the contrary, if the catalyst is sulfur poisoned, sulfides will deposit on the surface or in the micropores of the catalyst, blocking the reaction sites and causing an increase in the gas flow resistance, thereby increasing the pressure difference across the two ends of the DDPF. This increase in the pressure difference will further affect the operating stability of the system and increase the exhaust back pressure.

[0044] The above preset deviation value can be used to represent the deviation value between the preset actual carbon loading consumption value and the target carbon loading consumption value. Through the preset deviation value, the degree of sulfur poisoning of the DDPF can be judged.

[0045] Exemplarily, in the case of no sulfur poisoning, the theoretically consumed carbon loading of the DDPF may be 0.5 g / ml. However, when the DDPF is sulfur poisoned, the actually consumed carbon loading may be 0.1 g / ml. When the preset deviation value is 0.5 g / ml, since the difference between the theoretically consumed carbon loading and the actually consumed carbon loading is less than the preset deviation value of 0.5 g / ml, it indicates that sulfur poisoning occurs at the current moment. Generally, since the preset deviation value in this application can judge the degree of sulfur poisoning of the DDPF, based on the above exemplary description, it can also be considered that when the difference between the theoretically consumed carbon loading and the actually consumed carbon loading is less than 0.2 g / ml, the degree of sulfur poisoning of the DDPF is relatively deep.

[0046] It should be noted that the above preset deviation value is only for exemplary illustration here and can be adjusted according to the actual situation.

[0047] Specifically, since the DDPF is in the passive regeneration temperature region, when the carbon loading inside the DDPF is higher than a certain value, the pressure difference across the DDPF will significantly decrease. However, when the catalyst inside the DDPF is sulfur poisoned, insufficient NO2 can be generated to reduce the carbon loading, and the pressure difference across the DDPF continues to rise. Based on this, in this application, by obtaining the difference between the target carbon loading consumption value and the actual carbon loading consumption value, it can be determined whether the DDPF is sulfur poisoned. When the difference between the target carbon loading consumption value and the actual carbon loading consumption value is less than or equal to a preset deviation value, it indicates that the DDPF is sulfur poisoned. At the same time, the degree of sulfur poisoning of the DDPF can also be judged according to the preset deviation value.

[0048] The method for judging sulfur poisoning of the integrated oxidation trap provided in this application, when the integrated oxidation trap is in the passive regeneration state, by obtaining the actual carbon loading consumption value in the integrated oxidation trap and the target carbon loading consumption value in the passive regeneration reaction process, and comparing the actual carbon loading consumption value with the target carbon loading consumption value. When the difference obtained by subtracting the actual carbon loading consumption value from the target carbon loading consumption value is less than or equal to the preset deviation value, it indicates that the carbon loading inside the current integrated oxidation trap is relatively high, that is, insufficient NO2 can be generated inside the current integrated oxidation trap to reduce the carbon loading. Thus, it can be determined that a certain amount of sulfur oxides are trapped in the SCR in the after-treatment system, and then it is determined that the integrated oxidation trap is sulfur poisoned. By providing the integrated oxidation trap, the purpose of saving costs is achieved by coating the catalysts of the DOC formula and the DPF formula in partitions and taking into account the functions of both, and further the technical effect of improving the judgment efficiency of vehicle fuel sulfur poisoning is achieved, thereby solving the problem of low judgment efficiency of vehicle fuel sulfur poisoning in the prior art.

[0049] In an embodiment of this application, obtaining the actual carbon loading consumption value in the integrated oxidation trap includes: when the integrated oxidation trap is in the passive regeneration state, setting a carbon loading sequence for a preset duration; calculating the average value of the initial carbon loading in the carbon loading sequence for the preset duration to obtain the average value of the initial carbon loading; based on the passive regeneration reaction in the integrated oxidation trap, updating the carbon loading sequence for the preset duration until the average value of the carbon loading in the carbon loading sequence for the preset duration is in a preset smooth state, and determining the average value of the carbon loading in the preset smooth state as the first average value of the carbon loading; obtaining the difference between the average value of the initial carbon loading and the first average value of the carbon loading to obtain the actual carbon loading consumption value.

[0050] Specifically, the above-mentioned carbon loading sequence for the preset duration can be used to represent the carbon loading values at each moment within a preset period of time. Exemplarily, it can be the carbon loading values at each moment within 60 s, or the carbon loading values at each moment within 70 s. Here, no specific setting is made for the carbon loading sequence for the preset duration, and it can be adjusted according to the actual situation.

[0051] The above 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.

[0052] After the carbon loading sequence of the preset duration, multiple carbon loading values that initially fill the above preset duration sequence when the DDPF enters the passive regeneration reaction can be obtained, and the average value of the multiple carbon loading values can be calculated to obtain the above initial average carbon loading.

[0053] Furthermore, with the passive regeneration reaction inside the DDPF, the carbon loading sequence of the preset duration is updated. Exemplarily, when the preset duration sequence is 60s, the carbon loading at each moment from time t1 to time t60 within these 60s can be updated. After filling the corresponding carbon loading within the 60s preset duration sequence, the carbon loading filled within this 60s is updated according to the first-in-first-out principle, that is, filling the carbon loading at each moment from time t1 to time t60 starts again, and so on in a cycle. The average value of the carbon loading within each 60s cycle is calculated to obtain the average carbon loading value output for each cycle. Furthermore, filtering the multiple average carbon loading values can obtain the average carbon loading value corresponding to the preset smooth state, and this average carbon loading value is determined as the above first average carbon loading.

[0054] Among them, when obtaining the carbon loading corresponding to each moment within the above preset duration sequence, it can be calculated through the pressure difference between the two ends of the exhaust gas input port and the discharge port of the DDPF.

[0055] In view of this, 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 is obtained to obtain the above actual carbon loading consumption value.

[0056] In an embodiment of the present application, obtaining the target carbon loading consumption value during the passive regeneration reaction of the integrated oxidation trap includes: obtaining multiple carbon loadings corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap; performing an integration operation on the initial carbon loading and the multiple carbon loadings to obtain the current carbon loading; obtaining the difference between the initial carbon loading and the current carbon loading to obtain the target carbon loading consumption value.

[0057] Specifically, the above multiple carbon loadings can be obtained by subtracting the carbon loading consumed at the corresponding moment from the carbon loading input into the DDPF at multiple moments.

[0058] The above current carbon loading, which is used to characterize the carbon loading inside the DDPF at the current moment, can be obtained by continuously subtracting the carbon loading during the passive regeneration reaction from the initial carbon loading. Among them, the carbon loading during the passive regeneration reaction can be obtained by integrating the difference obtained by subtracting the consumed carbon loading at each moment during the passive regeneration reaction from the carbon loading entering the DDPF at each moment.

[0059] In an alternative embodiment, in order to obtain the theoretically consumed carbon loading when the DDPF enters the passive regeneration range, the initial carbon loading when the DDPF just enters the passive regeneration reaction can be obtained. As the passive regeneration reaction progresses, the current carbon loading inside the DDPF at the current moment can be obtained by continuously subtracting the accumulated carbon loading during the passive regeneration reaction from the above initial carbon loading. Furthermore, the target carbon loading consumption value, that is, the above theoretically consumed carbon loading, can be obtained by subtracting the current carbon loading from the initial carbon loading.

[0060] In an embodiment of the present application, the method further includes: obtaining the pressure difference between the exhaust gas inlet port and the exhaust port of the integrated oxidation trap; calculating the initial carbon loading according to the pressure difference between the two ends.

[0061] Specifically, in order to calculate the initial carbon loading of the DDPF based on the pressure difference between the two ends, the following method can be adopted: establish a relationship model between the pressure difference and the carbon loading, that is, conduct experiments on the engine test bench to obtain the corresponding relationship (MAP diagram) between the pressure difference at both ends of the DDPF and the exhaust gas flow rate under different carbon loadings, and establish a carbon loading model based on the pressure difference through these data; measure real-time data, and in actual operation, measure the pressure difference at both ends of the DDPF and the exhaust gas flow rate in real time through sensors; calculate the carbon loading, and estimate the initial carbon loading by interpolation or directly querying the MAP diagram according to the measured pressure difference and exhaust gas flow rate in real time and the established model above.

[0062] Furthermore, in order to improve the accuracy, a credibility factor can be introduced to evaluate the change of carbon loading under different working 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, calculate the credibility factor f, and adjust the calculation of carbon loading according to the formula PV = PV1×f + PV2×(1−f).

[0063] In an embodiment of the present application, obtaining multiple carbon loadings corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap includes: obtaining the discharged carbon loading of the engine at multiple moments, and the carbon loading consumption values at multiple moments; obtaining the difference between the discharged carbon loading of the engine at multiple moments minus the carbon loading consumption values at multiple moments, to obtain multiple carbon loadings corresponding to multiple moments.

[0064] Specifically, the carbon loading of the exhaust gas of the above engine can be obtained through the corresponding relationship (MAP diagram) between the differential pressure across the DDPF and the exhaust gas flow rate.

[0065] In an alternative embodiment, in order to obtain the carbon loadings corresponding to multiple moments during the passive regeneration reaction of the DDPF, the carbon loading of the engine exhaust gas at multiple moments can be obtained through the corresponding relationship (MAP diagram) between the differential pressure across the DDPF and the exhaust gas flow rate. At the same time, the carbon load consumption values at multiple moments calculated through the passive regeneration reaction are obtained. After knowing the carbon loading of the engine exhaust gas and the carbon load consumption value in the DDPF at multiple moments, the carbon loadings corresponding to multiple moments can be obtained by subtracting the carbon load consumption values at multiple moments from the carbon loading of the engine exhaust gas at multiple moments.

[0066] In an embodiment of the present application, the method further includes: when the average temperature of the integrated oxidation trap continuously remains within a preset temperature range, and the duration exceeds a preset duration, and the current carbon loading in the integrated oxidation trap exceeds a preset carbon loading, it is confirmed that the integrated oxidation trap is in the passive regeneration interval.

[0067] Specifically, the above average temperature can be obtained by Figure 2 calculating the weighted average of the inlet temperature collected for T1 and the outlet temperature collected for T2.

[0068] The above preset temperature range can be used to represent the preset average temperature of the DDPF, which can be 280°C or 300°C. Here, the preset temperature range is not specifically set and can be adjusted according to the actual situation.

[0069] The above preset duration can be used to represent the time when the preset average temperature of the DDPF exceeds the preset temperature range, which can be 3 s or 4 s. Here, the preset duration is not specifically set and can be adjusted according to the actual situation.

[0070] The above preset carbon loading can be used to represent the current carbon loading in the preset DDPF. Generally, it can be 2 g or 3 g. Here, the preset carbon loading is not specifically set and can be adjusted according to the actual situation.

[0071] In an alternative embodiment, to determine whether the DDPF is sulfur poisoned, it needs to be judged after the DDPF enters the passive regeneration interval. Therefore, it is first necessary to confirm whether the DDPF enters the passive regeneration interval. Specifically, the present application makes a judgment based on the average temperature of the DDPF and the current carbon loading. When the average temperature of the DDPF continuously remains within the preset temperature range, and the duration exceeds the preset duration, and the current carbon loading in the DDPF exceeds the preset carbon loading, it is confirmed that the DDPF is in the passive regeneration interval.

[0072] In an embodiment of the present application, after determining that the integrated oxidation trap is sulfur poisoned, the method further includes: triggering a thermal management instruction to perform desulfurization control on the integrated oxidation trap.

[0073] Specifically, the above thermal management mode can be used to represent desulfurization control by heating the temperature inside the DDPF.

[0074] Generally, when the DDPF is sulfur poisoned, sulfides will deposit on the catalyst surface or in the micropores, resulting in the coverage or blockage of the catalyst active sites. This will not only reduce the catalytic efficiency of the catalyst, but also increase the exhaust back pressure, affecting the performance of the engine and the exhaust gas purification effect. Therefore, it is necessary to perform desulfurization control on the DDPF to restore the activity of the catalyst and ensure the normal operation of the exhaust gas treatment system.

[0075] Common methods for performing desulfurization control on the DDPF include but are not limited to the following: high-temperature regeneration method, by increasing the exhaust gas temperature, the sulfides are desorbed or decomposed from the catalyst surface. For example, controlling the post-injection fuel quantity of the engine to increase the exhaust gas temperature to a certain value (such as 500 - 600 °C) and maintaining it for a certain period of time (such as 20 minutes) to achieve desulfurization; chemical reduction method, injecting a reducing agent (such as ammonia or urea) into the exhaust gas to reduce the sulfides to gaseous hydrogen sulfide or other volatile substances, so as to desorb from the catalyst surface; air-fuel ratio control method, adjusting the air-fuel ratio of the engine to alternate between a rich air-fuel ratio and a lean air-fuel ratio. The rich air-fuel ratio is helpful for the reduction of sulfides, while the lean air-fuel ratio is helpful for the combustion of particulate matter to prevent excessive accumulation of particulate matter in the DDPF; activated carbon adsorption and regeneration method, using activated carbon as a desulfurization filter element to adsorb SO2 in the exhaust gas. When the activated carbon is saturated with adsorption, it is regenerated at a high temperature (500 - 600 °C), so that the adsorbed H2SO4 is decomposed into SO2 and water vapor, and at the same time the particulate matter burns at a high temperature to achieve the regeneration of the filter element.

[0076] In an embodiment of the present application, triggering a thermal management instruction to perform desulfurization control on the integrated oxidation trap includes: raising the temperature inside the integrated oxidation trap to a preset temperature, where the preset temperature is the temperature required for desulfurization; performing desulfurization control on the integrated oxidation trap at the preset temperature.

[0077] Specifically, the above preset temperature can be used to represent the temperature preset for decomposing the sulfides inside the DDPF. Exemplarily, it can be 500 °C, or 550 °C, or 600 °C, etc. The preset temperature is not specifically set here and can be adjusted according to the actual situation.

[0078] In an alternative embodiment, desulfurization control of the integrated oxidation trap is performed based on triggering a thermal management instruction. The temperature inside the DDPF can be raised to a temperature at which sulfides inside the DDPF are decomposed, and then desulfurization control of the sulfides inside the DDPF is performed at this temperature.

[0079] In an embodiment of the present application, the method further includes: recording the number of desulfurization times of the integrated oxidation trap to obtain the total number of desulfurization times; if within a preset time, the total number of desulfurization times exceeds the preset number of desulfurization times, a reminder instruction is generated, and the reminder instruction is used to remind the user that the engine fuel is sulfur poisoned and to replace the fuel.

[0080] Specifically, the above-mentioned preset number of desulfurization times can be used to represent the preset number of times of desulfurizing the DDPF. Generally, it can be 3 times or 4 times. The preset number of desulfurization times is not specifically set here and can be adjusted according to the actual situation.

[0081] Among them, when recording the number of desulfurization times of the DDPF, the engine control unit or the aftertreatment system control unit can be used to record each desulfurization process to obtain the above-mentioned total number of desulfurization times; it can also be to use a professional diagnostic tool (such as an OBD-II scan tool) to connect to the diagnostic interface of the vehicle and read the regeneration and desulfurization related parameters of the DDPF. These tools can display historical data, including the number of desulfurization operations; it can also be to record the time and conditions of each desulfurization operation through the vehicle's remote monitoring system or on-board information system, and regularly export data for statistics, etc. The specific desulfurization statistics method is not uniquely limited here.

[0082] In an alternative embodiment, in addition to performing desulfurization control on the DDPF, it is also necessary to count the number of desulfurization times of the DDPF, that is, to obtain the above-mentioned total number of desulfurization times. If the total number of desulfurization times exceeds the preset number of desulfurization times within a certain time, it means that the DDPF is desulfurized relatively frequently, indicating that the sulfur content in the fuel continues to be too high, and frequent desulfurization cannot completely solve the problem. Therefore, when the total number of desulfurization times exceeds the preset number of desulfurization times, a reminder instruction can be generated to remind the user that the engine fuel is sulfur poisoned and to replace the fuel, so as to fundamentally reduce the risk of sulfur poisoning.

[0083] As the second aspect of the present application, the present application also provides an integrated oxidation trap sulfur poisoning judgment device. Figure 3 The following shows a schematic diagram of an integrated oxidation trap sulfur poisoning judgment device provided by an embodiment of the present application, as Figure 3 shown, the sulfur poisoning judgment device 3 includes: a controller 31, and the controller is used to execute the integrated oxidation trap sulfur poisoning judgment method of any one of the above.

[0084] As the third aspect of the present application, the present application also provides a vehicle. Figure 4The figure shows a schematic diagram of a vehicle provided by an embodiment of the present application. As Figure 4 shown, the vehicle includes: an integrated oxidation trap 41; an engine 42; and the sulfur poisoning determination device 3 described above. The integrated oxidation trap 41 is connected to the engine 42 and is used for post-processing the exhaust gas discharged from the engine 42. The sulfur poisoning determination device 3 is connected to the integrated oxidation trap 41 and is used to execute the integrated oxidation trap sulfur poisoning determination method of any one of the above.

[0085] In the integrated oxidation trap sulfur poisoning determination method provided by the present application, when the integrated oxidation trap is in the passive regeneration state, by obtaining the actual carbon loading consumption value in the integrated oxidation trap and the target carbon loading consumption value in the passive regeneration reaction process, and comparing the actual carbon loading consumption value with the target carbon loading consumption value. When the difference obtained by subtracting the actual carbon loading consumption value from the target carbon loading consumption value is less than or equal to a preset deviation value, it indicates that the carbon loading inside the current integrated oxidation trap is relatively high, that is, insufficient NO2 can be generated inside the current integrated oxidation trap to reduce the carbon loading. Thus, it can be determined that a certain amount of sulfur oxides are trapped in the SCR in the post-treatment system, and further determine that the integrated oxidation trap is sulfur poisoned. By providing the integrated oxidation trap, the purpose of saving costs is achieved by combining the functions of the DOC-formulated catalyst and the DPF-formulated catalyst through zoned coating, and further the technical effect of improving the judgment efficiency of vehicle fuel sulfur poisoning is achieved, thereby solving the problem of low judgment efficiency of vehicle fuel sulfur poisoning in the prior art.

[0086] The method in the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, a core network device, an OAM, or other programmable devices.

[0087] The computer program product can be written in any combination of one or more programming languages for the program code to execute the operations of the embodiments of the present application. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, executed as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0088] The computer program or instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium may be any available medium that can be accessed by a computer, 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; it may also be an optical medium, such as a digital video disc; or it may be 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.

[0089] In addition, an embodiment of the present application may also be a storage medium on which a computer program is stored, and the computer program is executed by a processor to perform the steps in a method for judging sulfur poisoning of an integrated oxidation trap described in any of the above embodiments of this specification.

[0090] For the foregoing method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps may be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0091] It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments may be referred to each other. For device embodiments, since they are basically similar to the method embodiments, they are described relatively simply, and the relevant parts may refer to the partial description of the method embodiments.

[0092] The steps in the methods of the embodiments of the present application may be adjusted, combined, and deleted according to actual needs. The technical features recorded in each embodiment may be replaced or combined. The devices in the embodiments of the present application may be combined, divided, and deleted according to actual needs.

[0093] Those skilled in the art may further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner 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 to exceed the scope of this application.

[0094] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be directly implemented by hardware, software units executed by a processor, or a combination of both. The software units can be placed in a random access memory (RAM), internal 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.

[0095] Finally, it should also be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0096] The above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated oxidation trap sulfur poisoning judgment method, characterized in that Including: When the integrated oxidation trap is in the passive regeneration state, obtain the actual carbon loading consumption value in the integrated oxidation trap, where the actual carbon loading consumption value is obtained by subtracting the average value of the first carbon loading during the passive regeneration reaction from the average value of the initial carbon loading entering the integrated oxidation trap; Obtain the target carbon loading consumption value during the passive regeneration reaction of the integrated oxidation trap, where the target carbon loading consumption value is obtained by subtracting the current carbon loading from the initial carbon loading just entering the integrated oxidation trap; When the difference obtained by subtracting the actual carbon loading consumption value from the target carbon loading consumption value is less than or equal to a preset deviation value, determine that the integrated oxidation trap is sulfur poisoned.

2. The method for judging sulfur poisoning of the integrated oxidation trap according to claim 1, characterized in that The obtaining of the actual carbon loading consumption value in the integrated oxidation trap includes: When the integrated oxidation trap is in the passive regeneration state, set a carbon loading sequence for a preset duration; Perform a mean calculation on the initial carbon loading in the preset-duration carbon loading sequence to obtain the average value of the initial carbon loading; Based on the passive regeneration reaction in the integrated oxidation trap, update the preset-duration carbon loading sequence until the average value of the carbon loading in the preset-duration carbon loading sequence is in a preset smooth state, and determine the average value of the carbon loading in the preset smooth state as the first carbon loading average value; Obtain the difference between the average value of the initial carbon loading and the first carbon loading average value to obtain the actual carbon loading consumption value.

3. The method for judging sulfur poisoning of the integrated oxidation trap according to claim 1, wherein The obtaining of the target carbon loading consumption value during the passive regeneration reaction of the integrated oxidation trap includes: Obtain multiple carbon loadings corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap; Perform an integration operation on the initial carbon loading and the multiple carbon loadings to obtain the current carbon loading; Obtain the difference between the initial carbon loading and the current carbon loading to obtain the target carbon loading consumption value.

4. The method for judging sulfur poisoning of the integrated oxidation trap according to claim 1, wherein The method further includes: Obtain the pressure difference between the two ends of the exhaust gas inlet port and the exhaust port of the integrated oxidation trap; Calculate the initial carbon loading according to the pressure difference between the two ends.

5. The integrated oxidation trap sulfur poisoning determination method according to claim 3, characterized in that, The obtaining of the multiple carbon loadings corresponding to multiple moments during the passive regeneration reaction of the integrated oxidation trap includes: Obtain the carbon loading discharged from the engine at multiple moments and the carbon loading consumption values at multiple moments; Obtain the difference between the carbon loading discharged from the engine at multiple moments and the carbon loading consumption values at multiple moments to obtain the multiple carbon loadings corresponding to the multiple moments.

6. The method for judging sulfur poisoning of the integrated oxidation trap according to claim 1, wherein, The method further includes: When the average temperature of the integrated oxidation trap continuously remains within a preset temperature range, and the duration exceeds a preset duration, and the current carbon loading in the integrated oxidation trap exceeds a preset carbon loading, confirm that the integrated oxidation trap is in the passive regeneration interval.

7. The method for judging sulfur poisoning of the integrated oxidation trap according to claim 1, wherein After determining that the integrated oxidation trap is sulfur poisoned, the method further includes: Trigger a thermal management instruction to perform desulfurization control on the integrated oxidation trap.

8. The method for judging sulfur poisoning of the integrated oxidation trap according to claim 7, characterized in that, The triggering of the thermal management instruction to perform desulfurization control on the integrated oxidation trap includes: Raise the temperature in the integrated oxidation trap to a preset temperature, where the preset temperature is the temperature required for desulfurization; Perform desulfurization control on the integrated oxidation trap at the preset temperature.

9. The method for judging sulfur poisoning of the integrated oxidation trap according to claim 7, wherein, The method further includes: recording the number of desulfurization times of the integrated oxidation trap to obtain the total number of desulfurization times; if within a preset time, the total number of desulfurization times exceeds a preset number of desulfurization times, generating a reminder instruction for reminding the user that the engine fuel is sulfur poisoned and replacing the fuel.

10. An integrated oxidation trap sulfur poisoning judgment device, characterized in that, It includes a controller, and the controller is used to execute the integrated oxidation trap sulfur poisoning judgment method according to any one of claims 1 to 9.

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