Method and device for determining sulfur poisoning of integrated oxidation trap, and vehicle

Abstract

The application provides a sulfur poisoning determination method and device of an integrated oxidation trap and a vehicle. The method comprises the following steps: when it is monitored that the pressure difference between the front end and the rear end of the integrated oxidation trap starts to decrease, the ratio of adjacent pressure difference peaks is calculated; and in the case that the cumulative number of times that the pressure difference peak ratio is less than a preset ratio threshold is greater than a preset number of times, it is determined that the integrated oxidation trap is sulfur poisoned. In this way, the purpose of determining the sulfur poisoning fault of the integrated oxidation trap by comparing whether the pressure difference peaks in adjacent regeneration times are abnormally reduced is achieved. Meanwhile, the use cost of the integrated oxidation trap is reduced by reducing the arrangement of the rear end temperature sensor of the integrated oxidation trap, and the technical problem of low sulfur poisoning determination efficiency of the DPF in the prior art is solved. In this way, the technical effect of improving the sulfur poisoning determination efficiency of the DPF while saving the cost is achieved.

Description

Technical Field

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

[0002] To meet increasingly stringent emission standards and continuously upgrade emission regulations for non-road diesel engines, DPF (diesel particulate filter) is an effective after-treatment technology that can significantly reduce carbon particulate matter produced by the engine, thereby reducing particulate matter emissions and meeting environmental protection requirements.

[0003] In existing technologies, the process of treating carbon soot particles generated by engines using a DPF often involves placing temperature sensors and other hardware at the front and rear ends of the DPF to collect temperature data. This data is then combined with HC conversion efficiency to determine whether DPF sulfur poisoning has occurred. This method increases the size and cost of the DPF system to some extent. Furthermore, due to the varying quality of fuels on the market, sulfur poisoning can prevent the DPF from regenerating, inevitably leading to low efficiency in detecting DPF sulfur poisoning. Summary of the Invention

[0004] In view of this, this application provides a method, device and vehicle for determining sulfur poisoning in an integrated oxidation trap, which solves the technical problem of low efficiency in determining sulfur poisoning in DPF.

[0005] To achieve the above objectives, this application provides the following technical solution: In response to a vehicle meeting a preset parking condition and the current carbon load in the vehicle's integrated oxidation trap exceeding a preset regeneration threshold, after triggering a parking regeneration request command and entering the parking regeneration mode, the inlet temperature of the integrated oxidation trap is acquired; when the inlet temperature exceeds a preset fuel injection temperature, the pressure difference between the front and rear ends of the integrated oxidation trap is acquired; when the pressure difference between the front and rear ends of the integrated oxidation trap meets a preset upward trend, a timing device is activated to monitor the pressure difference between the front and rear ends of the integrated oxidation trap at each moment, obtaining multiple pressure difference peak values; in response to the current moment exceeding a preset time and the pressure difference between the front and rear ends of the integrated oxidation trap starting to decrease, the ratio of two adjacent pressure difference peak values ​​among the multiple pressure difference peak values ​​is calculated, obtaining multiple pressure difference peak value ratios; if the cumulative number of times the pressure difference peak value ratio is less than a preset ratio threshold exceeds a preset number, sulfur poisoning of the integrated oxidation trap is determined.

[0006] In one embodiment of this application, in response to the current time exceeding a preset time and the pressure difference between the two ends of the integrated oxidation trap starting to decrease, the ratio of two adjacent pressure difference peaks among multiple pressure difference peaks is calculated to obtain multiple pressure difference peak ratios, including: in response to the current time exceeding a preset time and the pressure difference between the two ends of the integrated oxidation trap starting to decrease, obtaining the current pressure difference peak corresponding to the current time; based on multiple pressure difference peaks, calculating the ratio of the pressure difference peak of the previous time adjacent to the current pressure difference peak to obtain the current pressure difference peak ratio; when the current pressure difference peak ratio is less than a preset ratio threshold, using the current pressure difference peak as a reference value, comparing it with the pressure difference peak of the next time to obtain multiple pressure difference peak ratios.

[0007] In one embodiment of this application, when the current differential pressure peak ratio is less than a preset ratio threshold, the number of times the current differential pressure peak ratio is less than the preset ratio threshold is cumulatively counted, and the current differential pressure peak is stored.

[0008] In one embodiment of this application, when the current differential pressure peak ratio is greater than or equal to a preset ratio threshold, the current differential pressure peak value is updated.

[0009] In one embodiment of this application, before obtaining the inlet temperature of the integrated oxidation trap, the method further includes: after the integrated oxidation trap enters the parking regeneration mode, controlling the vehicle engine to increase the idle speed and performing thermal management on the integrated oxidation trap to increase the inlet temperature of the integrated oxidation trap.

[0010] In one embodiment of this application, after the inlet temperature exceeds the preset fuel injection temperature, the method further includes: obtaining the preset outlet temperature and exhaust gas mass flow rate of the integrated oxidation trap; calculating the inlet temperature, preset outlet temperature, and exhaust gas mass flow rate of the integrated oxidation trap to obtain the initial fuel injection quantity during parking regeneration; calculating the preset outlet temperature and model outlet temperature to obtain the corrected fuel injection quantity during parking regeneration, wherein the model outlet temperature is obtained by model calculation of the inlet temperature, heat exchange during parking regeneration, and fuel heat; calculating the sum of the initial fuel injection quantity and the corrected fuel injection quantity to obtain the target fuel injection quantity during parking regeneration; and controlling the vehicle's fuel injection device to inject fuel based on the target fuel injection quantity so that the outlet temperature of the integrated oxidation trap reaches the preset outlet temperature.

[0011] In one embodiment of this application, the initial fuel injection quantity for parking regeneration is obtained by calculating the inlet temperature, preset outlet temperature, and exhaust gas mass flow rate of the integrated oxidation trap. This includes: calculating the difference between the preset outlet temperature and the inlet temperature of the integrated oxidation trap to obtain the temperature difference between the front and rear ends of the integrated oxidation trap; calculating the product of the temperature difference between the front and rear ends multiplied by the specific heat capacity of the exhaust gas at the outlet of the integrated oxidation trap, and multiplying the product by the exhaust gas mass flow rate to obtain the heat released by the integrated oxidation trap, wherein the specific heat capacity of the exhaust gas at the outlet is obtained by looking up a table based on the inlet temperature of the integrated oxidation trap; calculating the quotient obtained by dividing the heat released by the integrated oxidation trap by the calorific value of the fuel, and dividing the quotient by the hydrocarbon conversion efficiency of the integrated oxidation trap to obtain the initial fuel injection quantity for parking regeneration.

[0012] In one embodiment of this application, the corrected fuel injection amount for parking regeneration is calculated by calculating the preset outlet temperature and the model outlet temperature, including: calculating the difference between the preset outlet temperature and the model outlet temperature to obtain the outlet temperature deviation value of the integrated oxidation trap; and performing proportional-integral calculation on the outlet temperature deviation value to obtain the corrected fuel injection amount for parking regeneration.

[0013] As a second aspect of this application, this application also provides a sulfur poisoning determination device for an integrated oxidation trap, comprising: a temperature acquisition module, used to acquire the inlet temperature of the integrated oxidation trap after triggering a parking regeneration request command and entering a parking regeneration mode in response to a vehicle meeting a preset parking condition and the current carbon load in the vehicle's integrated oxidation trap being greater than a preset regeneration threshold; a pressure difference acquisition module, used to acquire the pressure difference between the front and rear ends of the integrated oxidation trap when the inlet temperature is greater than a preset fuel injection temperature; and a peak monitoring module, used to detect when the integrated oxidation trap... When the pressure difference between the front and rear ends of the collector meets the preset upward trend, the timing device is activated to monitor the pressure difference between the front and rear ends of the integrated oxidation trap at each moment, obtaining multiple pressure difference peak values; the ratio calculation module is used to calculate the ratio of two adjacent pressure difference peak values ​​among the multiple pressure difference peak values ​​when the current moment exceeds the preset time and the pressure difference between the front and rear ends of the integrated oxidation trap begins to decrease, obtaining multiple pressure difference peak value ratios; the poisoning determination module is used to determine that the integrated oxidation trap is poisoned by sulfur if the cumulative number of times the pressure difference peak value ratio is less than the preset ratio threshold is greater than the preset number.

[0014] 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.

[0015] The sulfur poisoning determination method for the integrated oxygen trap provided in this application, in response to the vehicle meeting a preset parking condition and the current carbon load in the vehicle's integrated oxygen trap being greater than a preset regeneration threshold, after triggering a parking regeneration request command and entering the parking regeneration mode, acquires the inlet temperature of the integrated oxygen trap; when the inlet temperature is greater than a preset fuel injection temperature, acquires the pressure difference between the front and rear ends of the integrated oxygen trap; when the pressure difference between the front and rear ends of the integrated oxygen trap meets a preset upward trend, a timing device is activated to monitor the pressure difference between the front and rear ends of the integrated oxygen trap at each moment, obtaining multiple pressure difference peak values; in response to the current moment exceeding a preset time and the pressure difference between the front and rear ends of the integrated oxygen trap starting to decrease, the ratio of two adjacent pressure difference peak values ​​among the multiple pressure difference peak values ​​is calculated to obtain multiple pressure difference peak value ratios; if the cumulative number of times the pressure difference peak value ratio is less than a preset ratio threshold is greater than a preset number, sulfur poisoning of the integrated oxygen trap is determined. It is noteworthy that when the pressure difference between the two ends of the integrated oxidation trap begins to decrease, the ratio of two adjacent pressure difference peak values ​​is calculated. If the cumulative number of times the pressure difference peak value ratio is less than the preset threshold is greater than the preset number, sulfur poisoning of the integrated oxidation trap can be determined based on the characteristics of the carbon soot volume and the exothermic reaction of carbon hydroxide during the regeneration process, which causes the pressure difference between the two ends to first increase and then decrease. This achieves the purpose of determining the sulfur poisoning fault of the integrated oxidation trap by comparing whether the pressure difference peak value during several adjacent regenerations decreases abnormally. At the same time, by reducing the number of temperature sensors at the back end of the integrated oxidation trap, the operating cost of the integrated oxidation trap is reduced, solving the technical problem of low efficiency in judging DPF sulfur poisoning in the existing technology. Thus, the technical effect of improving the efficiency of DPF sulfur poisoning judgment is achieved while saving costs. Attached Figure Description

[0016] 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.

[0017] Figure 1 The diagram shows a flowchart of a sulfur poisoning determination method for an integrated oxidation trap proposed in an embodiment of this application.

[0018] Figure 2 The figure shown is a schematic diagram of an integrated oxidation trap proposed in an embodiment of this application.

[0019] Figure 3 The diagram shown is a flowchart of sulfur poisoning diagnosis for an integrated oxidation trap proposed in one embodiment of this application.

[0020] Figure 4 The diagram shown is a schematic diagram of a sulfur poisoning detection device for an integrated oxidation trap according to an embodiment of this application.

[0021] Figure 5 The diagram shown is a schematic representation of a vehicle according to an embodiment of this application. Detailed Implementation

[0022] To meet increasingly stringent emission standards and continuously upgrade emission regulations for non-road diesel engines, DPF (diesel particulate filter) is an effective after-treatment technology that can significantly reduce carbon particulate matter produced by the engine, thereby reducing particulate matter emissions and meeting environmental protection requirements.

[0023] In existing technologies, the process of treating carbon soot particles generated by engines using a DPF often involves placing temperature sensors and other hardware at the front and rear ends of the DPF to collect temperature data. This data is then combined with HC conversion efficiency to determine whether DPF sulfur poisoning has occurred. This method increases the size and cost of the DPF system to some extent. Furthermore, due to the varying quality of fuels on the market, sulfur poisoning can prevent the DPF from regenerating, inevitably leading to low efficiency in detecting DPF sulfur poisoning.

[0024] The inventors of this application, through research, propose the following: When the pressure difference between the two ends of the integrated oxidation trap begins to decrease, the ratio of two adjacent pressure difference peak values ​​is calculated. If the cumulative number of times the pressure difference peak value ratio is less than a preset threshold is greater than a preset number, sulfur poisoning of the integrated oxidation trap can be determined based on the characteristics of the carbon soot volume and the exothermic reaction of carbon hydroxide during the regeneration process, which causes the pressure difference between the two ends to first increase and then decrease. This achieves the purpose of determining sulfur poisoning faults in the integrated oxidation trap by comparing whether the pressure difference peak value during adjacent regenerations decreases abnormally. At the same time, by reducing the number of temperature sensors at the back end of the integrated oxidation trap, the operating cost of the integrated oxidation trap is reduced. This solves the technical problem of low efficiency in judging DPF sulfur poisoning in the prior art, thus achieving the technical effect of improving the efficiency of DPF sulfur poisoning judgment while saving costs.

[0025] 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.

[0026] 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 according to an embodiment of this application. Figure 1 As shown, the determination method includes the following steps:

[0027] Step S101: In response to the vehicle meeting the preset parking conditions and the current carbon load in the vehicle's integrated oxidation trap being greater than the preset regeneration threshold, after triggering the parking regeneration request command and entering the parking regeneration mode, the inlet temperature of the integrated oxidation trap is obtained.

[0028] Specifically, the aforementioned preset parking conditions can be used to represent pre-set vehicle conditions. Since this application requires sulfur poisoning judgment for parking regeneration, the aforementioned preset parking conditions may include: the vehicle's clutch is not depressed, it is in neutral, the vehicle speed is 0, the accelerator pedal is not depressed, the foot brake is not depressed, the handbrake is engaged, the regeneration prohibition switch is not pressed, and there is no system fault that prohibits regeneration, etc.

[0029] The aforementioned integrated oxidation trap (DDPF) is an aftertreatment technology that integrates the functions of a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). Its core principle is to coat the DPF carrier with precious metals from a traditional DOC, enabling the DPF to perform both the functions of a DOC and the efficient capture and regeneration of particulate matter.

[0030] The aforementioned preset regeneration threshold can be used to represent the pre-set carbon loading in DDPF. For example, it can be 5 g / L, etc. The preset regeneration threshold is not specifically limited here and can be adjusted according to the actual situation.

[0031] When the carbon loading in DDPF exceeds the preset regeneration threshold, it indicates that there is a large amount of carbon loading in DDPF and regeneration is required.

[0032] The inlet temperature of the DDPF can be obtained by a temperature sensor placed at the front end of the DDPF.

[0033] Figure 2 The figure shown is a schematic diagram of an integrated oxidation trap proposed in an embodiment of this application. Figure 2As shown, T4 is the DDPF device. Engine exhaust gases such as soot, NOx, and fuel are input into the DDPF inlet, enabling the capture of soot and the oxidation of fuel to raise its temperature. T1 is a temperature sensor that collects the inlet temperature. T2 is a differential pressure sensor across the DDPF, used to collect the pressure difference between the front and rear ends of the DDPF. T3 is the model-calculated temperature. It should be noted that this application eliminates the traditional method of placing a temperature sensor at the rear end of the DDPF to collect the outlet temperature, thereby saving on the DDPF system cost. The DDPF outlet temperature can be obtained through model calculation; the specific calculation process is described below.

[0034] In one optional embodiment, during the sulfur poisoning determination process of DDPF, it is necessary to determine whether the vehicle meets the preset parking conditions. If the vehicle meets the preset parking conditions and the current carbon load in the DDPF is greater than the preset regeneration threshold, it indicates that the carbon load in the DDPF is too high and regeneration is required. The parking regeneration mode can be entered by triggering a parking regeneration request command, thereby obtaining the inlet temperature of the DDPF. The inlet temperature of the DDPF can be obtained by a temperature sensor arranged at the front end of the DDPF.

[0035] Step S102: When the inlet temperature is greater than the preset fuel injection temperature, obtain the pressure difference between the front and rear ends of the integrated oxidation trap.

[0036] Specifically, the aforementioned preset fuel injection temperature can be used to represent the pre-set temperature at which fuel injection is achieved. For example, it can be 500°C or 550°C, etc. The preset fuel injection temperature is not specifically limited here and can be adjusted according to the actual situation.

[0037] It is important to note that the injected fuel can only burn completely when the inlet temperature of the DDPF is greater than the preset fuel injection temperature, that is, when the inlet temperature of the DDPF is greater than the ignition temperature of the injected fuel; otherwise, the injection will stop.

[0038] In one optional embodiment, after obtaining the inlet temperature of the DDPF, thermal management of the DDPF inlet temperature can be performed until the DDPF inlet temperature exceeds a preset fuel injection temperature, thereby controlling the fuel injection device to inject fuel. Simultaneously, it can be achieved through... Figure 2 The differential pressure sensor T2 shown is used to monitor the pressure difference between the front and rear ends of the DDPF to obtain the aforementioned pressure difference between the front and rear ends.

[0039] Step S103: When the pressure difference between the front and rear ends of the integrated oxidation trap meets the preset upward trend, the timing device is started to monitor the pressure difference between the front and rear ends of the integrated oxidation trap at each moment and obtain multiple pressure difference peaks.

[0040] Specifically, the aforementioned preset upward trend can be used to indicate that the pressure difference between the two ends of the preset DDPF is monotonically increasing.

[0041] In one optional embodiment, when the pressure difference between the two ends of the DDPF is detected to be monotonically increasing, and it is determined that there is no pressure difference sensor-related fault in the DDPF, a timing device can be started to monitor the pressure difference between the two ends of the DDPF at each moment, and multiple pressure difference peaks at multiple moments can be obtained. For example, the pressure difference peak P1 at time T1, the pressure difference peak P2 at time T2, the pressure difference peak Pn at time Tn, etc. can be obtained.

[0042] Step S104: In response to the current time exceeding the preset time and the pressure difference between the front and rear ends of the integrated oxidation trap starting to decrease, the ratio of two adjacent pressure difference peaks among multiple pressure difference peaks is calculated to obtain multiple pressure difference peak ratios.

[0043] Specifically, the aforementioned preset time can be used to represent a pre-set timing duration, such as 10 minutes or 11 minutes. There is no specific limitation on the preset time here, and it can be adjusted according to the actual situation.

[0044] The ratios of the aforementioned multiple pressure differential peak values ​​can be obtained by dividing the current pressure differential peak value by the ratio of the pressure differential peak value at the adjacent previous time.

[0045] In one optional embodiment, after detecting that the pressure difference between the two ends of DDPF begins to decrease and the timing duration exceeds a preset time, the ratio of two adjacent pressure difference peaks can be calculated based on the obtained multiple pressure difference peaks to obtain the aforementioned multiple pressure difference peak ratio.

[0046] Step S105: If the cumulative number of times the peak pressure difference ratio is less than the preset ratio threshold is greater than the preset number, the integrated oxidation trap is determined to be poisoned by sulfur.

[0047] Specifically, the aforementioned preset ratio threshold can be used to represent the peak pressure difference ratio between the two ends of the DDPF that is set in advance. The preset ratio threshold is not specifically limited here and can be adjusted according to the actual situation.

[0048] The aforementioned preset number of times can be used to represent the cumulative number of times the preset differential pressure peak ratio is less than the preset ratio threshold. There is no specific limitation on the preset number of times, which can be adjusted according to the actual situation.

[0049] In one optional embodiment, sulfur poisoning of the integrated oxidant trap can be determined by the amount of soot during the DDPF regeneration process and the characteristic that the pressure difference between the two ends first increases and then decreases due to the exothermic reaction of hydrocarbon oxidation. Therefore, after obtaining multiple pressure difference peak ratios, these ratios can be compared to determine whether they are less than a preset threshold. Furthermore, to ensure the accuracy of the sulfur poisoning determination, it can be further determined whether the cumulative number of times the pressure difference peak ratio is less than the preset threshold is greater than a preset number. If the cumulative number of times the pressure difference peak ratio is less than the preset threshold is greater than the preset number, it indicates that the decrease in the pressure difference peak ratio is relatively stable without abnormal fluctuations, and DDPF sulfur poisoning can be determined.

[0050] The sulfur poisoning determination method for the integrated oxygen trap provided in this application, in response to the vehicle meeting a preset parking condition and the current carbon load in the vehicle's integrated oxygen trap being greater than a preset regeneration threshold, after triggering a parking regeneration request command and entering the parking regeneration mode, acquires the inlet temperature of the integrated oxygen trap; when the inlet temperature is greater than a preset fuel injection temperature, acquires the pressure difference between the front and rear ends of the integrated oxygen trap; when the pressure difference between the front and rear ends of the integrated oxygen trap meets a preset upward trend, a timing device is activated to monitor the pressure difference between the front and rear ends of the integrated oxygen trap at each moment, obtaining multiple pressure difference peak values; in response to the current moment exceeding a preset time and the pressure difference between the front and rear ends of the integrated oxygen trap starting to decrease, the ratio of two adjacent pressure difference peak values ​​among the multiple pressure difference peak values ​​is calculated to obtain multiple pressure difference peak value ratios; if the cumulative number of times the pressure difference peak value ratio is less than a preset ratio threshold is greater than a preset number, sulfur poisoning of the integrated oxygen trap is determined. It is noteworthy that when the pressure difference between the two ends of the integrated oxidation trap begins to decrease, the ratio of two adjacent pressure difference peak values ​​is calculated. If the cumulative number of times the pressure difference peak value ratio is less than the preset threshold is greater than the preset number, sulfur poisoning of the integrated oxidation trap can be determined based on the characteristics of the carbon soot volume and the exothermic reaction of carbon hydroxide during the regeneration process, which causes the pressure difference between the two ends to first increase and then decrease. This achieves the purpose of determining the sulfur poisoning fault of the integrated oxidation trap by comparing whether the pressure difference peak value during several adjacent regenerations decreases abnormally. At the same time, by reducing the number of temperature sensors at the back end of the integrated oxidation trap, the operating cost of the integrated oxidation trap is reduced, solving the technical problem of low efficiency in DPF sulfur poisoning detection in the prior art. This achieves the technical effect of improving the efficiency of DPF sulfur poisoning detection while saving costs.

[0051] In one embodiment of this application, in response to the current time exceeding a preset time and the pressure difference between the two ends of the integrated oxidation trap starting to decrease, the ratio of two adjacent pressure difference peaks among multiple pressure difference peaks is calculated to obtain multiple pressure difference peak ratios, including: in response to the current time exceeding a preset time and the pressure difference between the two ends of the integrated oxidation trap starting to decrease, obtaining the current pressure difference peak corresponding to the current time; based on multiple pressure difference peaks, calculating the ratio of the pressure difference peak of the previous time adjacent to the current pressure difference peak to obtain the current pressure difference peak ratio; when the current pressure difference peak ratio is less than a preset ratio threshold, using the current pressure difference peak as a reference value, comparing it with the pressure difference peak of the next time to obtain multiple pressure difference peak ratios.

[0052] Specifically, in the process of calculating the ratio of two adjacent differential pressure peaks among multiple differential pressure peaks to obtain multiple differential pressure peak ratios, the differential pressure between the two ends of the DDPF can be continuously monitored. If the differential pressure between the two ends of the DDPF starts to decrease after a preset time, the current differential pressure peak at the current moment can be obtained. At the same time, based on multiple differential pressure peaks, the differential pressure peak of the previous moment adjacent to the current moment can be obtained. By comparing the current differential pressure peak with the differential pressure peak of the previous moment, the ratio of the current differential pressure peak is obtained, and it is determined whether the current differential pressure peak ratio is less than a preset ratio threshold. If the current differential pressure peak ratio is less than the preset ratio threshold, the current differential pressure peak can be used as a reference value and compared with the differential pressure peak of the next moment. In this way, multiple differential pressure peak ratios can be obtained.

[0053] For example, if the peak pressure difference at time T1 is 0.8 kPa, at time T2 it is 0.7 kPa, at time T3 it is 0.6 kPa, at time T4 it is 0.5 kPa, at time T5 it is 0.2 kPa, and at time T6 it is 0.1 kPa, it can be seen from the above example that the peak pressure difference at both ends of DDPF decreases relatively slowly from T1 to T4, but decreases abnormally at time T5, with the peak pressure difference at time T5 being... The ratio can be 0.2 / 0.5, but when calculating the peak pressure difference ratio at time T6, it cannot be 0.1 / 0.2 because the peak pressure difference at both ends at time T5 drops abnormally. To ensure the accuracy of the calculation results, outlier data needs to be removed. That is, when calculating the peak pressure difference ratio, the peak pressure difference of 0.2 kPa at time T5 needs to be removed. Therefore, the peak pressure difference ratio at time T6 can be 0.1 / 0.5, which is obtained by dividing the peak pressure difference at time T6 by the peak pressure difference at time T4. The peak pressure difference at time T4 can be understood as the baseline value mentioned above.

[0054] In one embodiment of this application, when the current differential pressure peak ratio is less than a preset ratio threshold, the number of times the current differential pressure peak ratio is less than the preset ratio threshold is cumulatively counted, and the current differential pressure peak is stored.

[0055] Specifically, when the current differential pressure peak ratio is less than the preset ratio threshold, in addition to using the current differential pressure peak as a benchmark value and comparing it with the differential pressure peak at the next moment, the number of times the current differential pressure peak ratio is less than the preset ratio threshold can also be cumulatively counted. In this way, whenever the differential pressure peak ratio is less than the preset ratio threshold, it is cumulatively counted. By statistically analyzing the cumulative count over a period of time, it is possible to assess whether DDPF is causing sulfur poisoning.

[0056] In addition, when the current differential pressure peak ratio is less than the preset ratio threshold, the current differential pressure peak needs to be stored, that is, the current differential pressure peak is locked and stored in a preset array so that it can be retained after the vehicle is powered off.

[0057] In one embodiment of this application, when the current differential pressure peak ratio is greater than or equal to a preset ratio threshold, the current differential pressure peak value is updated.

[0058] Specifically, in the process of judging the current differential pressure peak ratio, if the current differential pressure peak ratio is greater than or equal to the preset ratio threshold, it means that DDPF sulfur poisoning cannot be determined by the current differential pressure peak ratio. The current differential pressure peak needs to be updated, that is, by continuously monitoring the change of differential pressure peak, the differential pressure peak at the next moment is locked for comparison.

[0059] In one embodiment of this application, before obtaining the inlet temperature of the integrated oxidation trap, the method further includes: after the integrated oxidation trap enters the parking regeneration mode, controlling the vehicle engine to increase the idle speed and performing thermal management on the integrated oxidation trap to increase the inlet temperature of the integrated oxidation trap.

[0060] Specifically, after the DDPF enters parking regeneration mode, in order to raise the DDPF inlet temperature to the preset fuel injection temperature, the vehicle engine idle speed can be increased, and thermal management of the integrated oxidation trap can be implemented. Specifically, this can be achieved by adjusting the throttle opening, as the throttle controls the amount of air entering the engine; appropriately increasing the throttle opening allows more air to enter the engine, thereby increasing the idle speed. Alternatively, it can be achieved by adjusting the idle speed control valve, which controls the intake air volume at idle based on engine operating conditions; reasonable adjustments can change the idle speed. Another method is by modifying the engine control unit (ECU) parameters; using specialized diagnostic equipment and software, ECU parameters can be modified to increase idle speed, etc. There is no single, universally applicable method for DPF thermal management; adjustments can be made based on actual conditions.

[0061] Figure 3 The diagram shown is a flowchart of sulfur poisoning diagnosis for an integrated oxidation trap proposed in one embodiment of this application. Figure 3 As shown, the diagnostic process for DDPF sulfur poisoning includes the following steps:

[0062] S301, determine whether the vehicle has entered the parking regeneration mode. If yes, proceed to S302; otherwise, continue to S301.

[0063] S302, improves idle speed and performs thermal management to raise temperature;

[0064] This involves increasing the engine idle speed and implementing thermal management for the DDPF to ensure that the DDPF inlet temperature reaches the preset fuel injection temperature.

[0065] S303: Determine if the upstream temperature of DDPF is greater than the ignition temperature limit. If yes, proceed to S304; otherwise, continue to S303.

[0066] This means determining whether the inlet temperature of the DDPF has reached the preset fuel injection temperature.

[0067] S304, regeneration during parking is achieved through engine after-injection;

[0068] S305: Determine if there is no differential pressure sensor fault and if the DDPF differential pressure value is monotonically increasing. If yes, proceed to S306; otherwise, continue to S305.

[0069] That is, to determine whether there is a fault in the differential pressure sensor, and to determine whether the differential pressure values ​​at the two ends of the DDPF meet the preset upward trend.

[0070] S306, Start timing and calculate the peak DDPF differential pressure;

[0071] S307: When the timer exceeds a certain value and it is determined that the DDPF pressure difference begins to decrease, if so, execute S308; otherwise, continue executing S307.

[0072] That is, to determine whether the current time is greater than the preset time, and whether the pressure difference between the two ends of the DDPF has started to decrease.

[0073] S308, lock in the current peak DDPF differential pressure;

[0074] S309, calculate whether the ratio of two consecutive pressure difference peak values ​​is less than the threshold. If yes, execute S310; otherwise, update the pressure difference peak value comparison.

[0075] That is, to determine whether the ratio of two adjacent pressure difference peak values ​​is less than a preset ratio threshold.

[0076] S310, locks the peak differential pressure comparison value, and subsequent ratios are based on this value;

[0077] S311, Does the number of times the ratio of the differential pressure peak value is less than the threshold exceed the limit? If yes, then execute S312; otherwise, return to S301 to start the judgment again.

[0078] That is, to determine whether the cumulative number of times the peak pressure difference ratio is less than the preset ratio threshold is greater than the preset number.

[0079] S312, diagnosed as DDPF sulfur poisoning.

[0080] In one embodiment of this application, after the inlet temperature exceeds the preset fuel injection temperature, the method further includes: obtaining the preset outlet temperature and exhaust gas mass flow rate of the integrated oxidation trap; calculating the inlet temperature, preset outlet temperature, and exhaust gas mass flow rate of the integrated oxidation trap to obtain the initial fuel injection quantity during parking regeneration; calculating the preset outlet temperature and model outlet temperature to obtain the corrected fuel injection quantity during parking regeneration, wherein the model outlet temperature is obtained by model calculation of the inlet temperature, heat exchange during parking regeneration, and fuel heat; calculating the sum of the initial fuel injection quantity and the corrected fuel injection quantity to obtain the target fuel injection quantity during parking regeneration; and controlling the vehicle's fuel injection device to inject fuel based on the target fuel injection quantity so that the outlet temperature of the integrated oxidation trap reaches the preset outlet temperature.

[0081] Specifically, since this application does not set a temperature sensor at the back end of the DDPF to collect the downstream temperature of the DDPF, in order to ensure that the outlet temperature of the DDPF reaches the preset outlet temperature, the outlet temperature of the DDPF can be gradually increased by controlling the amount of fuel injected until the outlet temperature of the DDPF reaches the preset outlet temperature.

[0082] The aforementioned preset outlet temperature can be used to represent the preset downstream outlet temperature of DDPF. Generally, it can be 600℃ or 650℃, etc. There is no specific limitation on the preset outlet temperature here, and it can be adjusted according to the actual situation.

[0083] The aforementioned exhaust gas mass flow rate is used to represent the mass flow rate of exhaust gas entering the DDPF. Generally, it can be calculated by the pressure difference between the two ends of the DDPF and the inlet temperature.

[0084] The aforementioned initial fuel injection quantity can be used to represent the feedforward fuel injection quantity of the engine during parking regeneration, and is a preliminarily calculated fuel injection quantity.

[0085] The aforementioned model outlet temperature can be used to represent the DDPF outlet temperature calculated through the model. Generally, a mathematical model can be established based on the engine characteristics, and the temperature can be obtained by calculating the inlet temperature, heat exchange during parking regeneration, and fuel heat.

[0086] The aforementioned corrected fuel injection quantity can be used to represent the closed-loop fuel injection quantity of the engine during parking regeneration, that is, the fuel injection quantity obtained by correcting the deviation between the model outlet temperature and the preset outlet temperature of the DDPF.

[0087] The aforementioned target injection quantity refers to the final amount of fuel injected by the vehicle's fuel injection system. This target injection quantity ensures that the DDPF outlet temperature reaches the preset outlet temperature.

[0088] In one optional embodiment, to obtain the target fuel injection quantity of the vehicle's fuel injection device, the initial fuel injection quantity during parking regeneration can be obtained by calculating the inlet temperature of the DDPF, the preset outlet temperature, and the exhaust gas mass flow rate. At the same time, the deviation between the preset outlet temperature and the model outlet temperature can be calculated to obtain the corrected fuel injection quantity during parking regeneration. By summing the initial fuel injection quantity and the corrected fuel injection quantity, the target fuel injection quantity during parking regeneration can be obtained. By controlling the vehicle's fuel injection device to inject the target fuel injection quantity, the outlet temperature of the DDPF can reach the preset outlet temperature.

[0089] In one embodiment of this application, the initial fuel injection quantity for parking regeneration is obtained by calculating the inlet temperature, preset outlet temperature, and exhaust gas mass flow rate of the integrated oxidation trap. This includes: calculating the difference between the preset outlet temperature and the inlet temperature of the integrated oxidation trap to obtain the temperature difference between the front and rear ends of the integrated oxidation trap; calculating the product of the temperature difference between the front and rear ends multiplied by the specific heat capacity of the exhaust gas at the outlet of the integrated oxidation trap, and multiplying the product by the exhaust gas mass flow rate to obtain the heat released by the integrated oxidation trap, wherein the specific heat capacity of the exhaust gas at the outlet is obtained by looking up a table based on the inlet temperature of the integrated oxidation trap; calculating the quotient obtained by dividing the heat released by the integrated oxidation trap by the calorific value of the fuel, and dividing the quotient by the hydrocarbon conversion efficiency of the integrated oxidation trap to obtain the initial fuel injection quantity for parking regeneration.

[0090] Specifically, the initial fuel injection quantity during parking regeneration can be calculated using a heat calculation formula. Specifically, the temperature difference between the front and rear ends of the DDPF can be obtained by subtracting the inlet temperature of the DDPF from the preset outlet temperature. Simultaneously, the product of this temperature difference, multiplied by the DDPF's outlet exhaust specific heat capacity and then by the exhaust gas mass flow rate, is the heat released by the DDPF. The DDPF's outlet exhaust specific heat capacity can be obtained by looking up the DDPF's inlet temperature in a table. Finally, the heat released by the DDPF is divided by the fuel's calorific value and then by the DDPF's HC conversion efficiency; the quotient obtained is the initial fuel injection quantity during parking regeneration.

[0091] In one embodiment of this application, the corrected fuel injection amount for parking regeneration is calculated by calculating the preset outlet temperature and the model outlet temperature, including: calculating the difference between the preset outlet temperature and the model outlet temperature to obtain the outlet temperature deviation value of the integrated oxidation trap; and performing proportional-integral calculation on the outlet temperature deviation value to obtain the corrected fuel injection amount for parking regeneration.

[0092] Specifically, the corrected fuel injection quantity for parking regeneration can be calculated by proportional-integral calculation of the deviation between the preset outlet temperature and the model outlet temperature. Specifically, the difference between the preset outlet temperature and the model outlet temperature can be calculated to obtain the DDPF outlet temperature deviation value; by performing proportional-integral calculation on the DDPF outlet temperature deviation value, the corrected fuel injection quantity for parking regeneration can be obtained. By correcting the initial fuel injection quantity with the corrected fuel injection quantity, a more accurate target fuel injection quantity can be obtained, thereby ensuring that the DDPF outlet temperature reaches the preset outlet temperature.

[0093] As a second aspect of this application, this application also provides a sulfur poisoning detection device for an integrated oxidation trap. Figure 4 The diagram shown is a schematic of a sulfur poisoning detection device for an integrated oxidation trap according to an embodiment of this application. Figure 4 As shown, the sulfur poisoning detection device 4 includes:

[0094] Temperature acquisition module 41 is used to acquire the inlet temperature of the integrated oxidation trap after triggering a parking regeneration request command and entering the parking regeneration mode in response to the vehicle meeting the preset parking conditions and the current carbon load in the vehicle's integrated oxidation trap being greater than the preset regeneration threshold.

[0095] The differential pressure acquisition module 42 is used to acquire the differential pressure between the front and rear ends of the integrated oxidation trap when the inlet temperature is greater than the preset fuel injection temperature.

[0096] The peak monitoring module 43 is used to start the timing device to monitor the pressure difference between the front and rear ends of the integrated oxidation trap at each moment when the pressure difference between the front and rear ends of the integrated oxidation trap meets the preset upward trend, and obtain multiple pressure difference peak values.

[0097] The ratio calculation module 44 is used to calculate the ratio of two adjacent pressure difference peaks among multiple pressure difference peaks when the current time exceeds the preset time and the pressure difference between the front and rear ends of the integrated oxidation trap begins to decrease, so as to obtain multiple pressure difference peak ratios.

[0098] The poisoning determination module 45 is used to determine sulfur poisoning in the integrated oxidation trap if the cumulative number of times the peak pressure difference ratio is less than the preset ratio threshold is greater than the preset number.

[0099] The sulfur poisoning detection device for the integrated oxidation trap provided in this application calculates the ratio of two adjacent peak pressure difference values ​​when the pressure difference between the two ends of the integrated oxidation trap begins to decrease. If the cumulative number of times the peak pressure difference ratio is less than a preset threshold is greater than a preset number, sulfur poisoning of the integrated oxidation trap can be determined based on the characteristics of the carbon soot volume and the exothermic reaction of carbon hydroxide during the regeneration process, which causes the pressure difference between the two ends to first increase and then decrease. This achieves the purpose of determining the sulfur poisoning fault of the integrated oxidation trap by comparing whether the peak pressure difference during several adjacent regenerations decreases abnormally. At the same time, by reducing the number of temperature sensors at the back end of the integrated oxidation trap, the operating cost of the integrated oxidation trap is reduced. This solves the technical problem of low efficiency in DPF sulfur poisoning detection in the prior art, thus achieving the technical effect of improving the efficiency of DPF sulfur poisoning detection while saving costs.

[0100] Optionally, the ratio calculation module includes: a current differential pressure peak value acquisition module, used to acquire the current differential pressure peak value corresponding to the current time when the current time exceeds a preset time and the differential pressure between the two ends of the integrated oxidation trap begins to decrease; a current differential pressure peak value ratio calculation module, used to calculate the ratio of the previous differential pressure peak value adjacent to the current differential pressure peak value based on multiple differential pressure peak values, to obtain the current differential pressure peak value ratio; and a multiple differential pressure peak value ratio acquisition module, used to take the current differential pressure peak value as a reference value and compare it with the differential pressure peak value at the next time when the current differential pressure peak value ratio is less than a preset ratio threshold, to obtain multiple differential pressure peak value ratios.

[0101] Optionally, multiple differential pressure peak ratio acquisition modules are specifically used to accumulate and count the number of times the current differential pressure peak ratio is less than the preset ratio threshold when the current differential pressure peak ratio is less than the preset ratio threshold, and to store the current differential pressure peak value.

[0102] Optionally, the multiple differential pressure peak ratio acquisition modules are also used to update the current differential pressure peak when the current differential pressure peak ratio is greater than or equal to a preset ratio threshold.

[0103] Optionally, the device also includes a thermal management module for controlling the vehicle engine to increase the idle speed and performing thermal management on the integrated oxidation trap after the integrated oxidation trap enters the parking regeneration mode, thereby increasing the inlet temperature of the integrated oxidation trap.

[0104] Optionally, the device further includes: an acquisition module for acquiring the preset outlet temperature and exhaust gas mass flow rate of the integrated oxidation trap; a first calculation module for calculating the inlet temperature, preset outlet temperature, and exhaust gas mass flow rate of the integrated oxidation trap to obtain the initial fuel injection quantity during parking regeneration; a second calculation module for calculating the preset outlet temperature and model outlet temperature to obtain the corrected fuel injection quantity during parking regeneration, wherein the model outlet temperature is obtained by model calculation of the inlet temperature, heat exchange during parking regeneration, and fuel heat; a third calculation module for calculating the sum of the initial fuel injection quantity and the corrected fuel injection quantity to obtain the target fuel injection quantity during parking regeneration; and a control module for controlling the vehicle's fuel injection device to inject fuel based on the target fuel injection quantity, so that the outlet temperature of the integrated oxidation trap reaches the preset outlet temperature.

[0105] Optionally, the first calculation module includes: a temperature difference calculation module for the front and rear ends, used to calculate the difference between the preset outlet temperature and the inlet temperature of the integrated oxidation trap to obtain the temperature difference between the front and rear ends of the integrated oxidation trap; a heat release calculation module, used to calculate the product of the temperature difference between the front and rear ends multiplied by the specific heat capacity of the outlet exhaust of the integrated oxidation trap, and to calculate the product multiplied by the mass flow rate of the exhaust gas to obtain the heat release of the integrated oxidation trap, wherein the specific heat capacity of the outlet exhaust is obtained by looking up the inlet temperature of the integrated oxidation trap in a table; and an initial fuel injection quantity calculation module, used to calculate the quotient obtained by dividing the heat release of the integrated oxidation trap by the calorific value of the fuel, and to calculate the quotient divided by the hydrocarbon conversion efficiency of the integrated oxidation trap to obtain the initial fuel injection quantity during parking regeneration.

[0106] Optionally, the second calculation module includes: an outlet temperature deviation calculation module, used to calculate the difference between the preset outlet temperature and the model outlet temperature to obtain the outlet temperature deviation value of the integrated oxidation trap; and a corrected fuel injection quantity calculation module, used to perform proportional-integral calculation on the outlet temperature deviation value to obtain the corrected fuel injection quantity during parking regeneration.

[0107] As a third aspect of this application, this application also provides a vehicle, Figure 5 The diagram shown is a schematic representation of a vehicle according to an embodiment of this application. Figure 5As shown, the vehicle 5 includes: an integrated oxidation trap 51; an engine 52; and the aforementioned sulfur poisoning determination device 4. The integrated oxidation trap 51 is connected to the engine 52 and is used to perform after-treatment on the exhaust gas discharged from the engine 52. The sulfur poisoning determination device 4 is connected to the integrated oxidation trap 51 and is used to perform the sulfur poisoning determination method of the integrated oxidation trap as described above.

[0108] The sulfur poisoning determination method for the integrated oxidation trap provided in this application calculates the ratio of two adjacent peak pressure difference values ​​when the pressure difference between the two ends of the integrated oxidation trap begins to decrease. If the cumulative number of times the peak pressure difference ratio is less than a preset threshold exceeds a preset number, sulfur poisoning of the integrated oxidation trap can be determined based on the characteristics of the carbon soot volume and the exothermic reaction of carbon hydroxide during the regeneration process, which causes the pressure difference between the two ends to first increase and then decrease. This achieves the purpose of determining the sulfur poisoning fault of the integrated oxidation trap by comparing whether the peak pressure difference during several adjacent regenerations decreases abnormally. At the same time, by reducing the number of temperature sensors at the back end of the integrated oxidation trap, the operating cost of the integrated oxidation trap is reduced. This solves the technical problem of low efficiency in DPF sulfur poisoning determination in the prior art, thus achieving the technical effect of improving the efficiency of DPF sulfur poisoning determination while saving costs.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] Furthermore, embodiments of this application may also be storage media storing a computer program, which is executed by a processor to perform the steps in the sulfur poisoning determination method for an integrated oxidation trap described in any of the above embodiments of this specification.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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: In response to the vehicle meeting the preset parking conditions and the current carbon load in the vehicle's integrated oxidation trap being greater than the preset regeneration threshold, after triggering the parking regeneration request command and entering the parking regeneration mode, the inlet temperature of the integrated oxidation trap is obtained. When the inlet temperature is greater than the preset fuel injection temperature, the pressure difference between the front and rear ends of the integrated oxidation trap is obtained; When the pressure difference between the front and rear ends of the integrated oxidation trap meets the preset upward trend, the timing device is activated to monitor the pressure difference between the front and rear ends of the integrated oxidation trap at each moment, and obtain multiple pressure difference peak values. When the current time exceeds a preset time and the pressure difference between the two ends of the integrated oxidation trap begins to decrease, the ratio of two adjacent pressure difference peaks among the multiple pressure difference peaks is calculated to obtain multiple pressure difference peak ratios. If the cumulative number of times the peak pressure ratio is less than a preset ratio threshold is greater than a preset number, the integrated oxidation trap is determined to be sulfur poisoned.

2. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 1, characterized in that, When the response exceeds a preset time and the pressure difference between the two ends of the integrated oxidation trap begins to decrease, the ratio of two adjacent pressure difference peaks among the plurality of pressure difference peaks is calculated to obtain a plurality of pressure difference peak ratios, including: When the current time exceeds a preset time and the pressure difference between the two ends of the integrated oxidation trap begins to decrease, the current pressure difference peak value corresponding to the current time is obtained. Based on the multiple differential pressure peaks, the ratio of the differential pressure peaks adjacent to the current differential pressure peak at the previous moment is calculated to obtain the current differential pressure peak ratio. When the current differential pressure peak ratio is less than a preset ratio threshold, the current differential pressure peak is used as a reference value and compared with the differential pressure peak at the next moment to obtain the multiple differential pressure peak ratios.

3. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 2, characterized in that, When the current differential pressure peak ratio is less than a preset ratio threshold, the number of times the current differential pressure peak ratio is less than the preset ratio threshold is cumulatively counted, and the current differential pressure peak is stored.

4. The method for determining sulfur poisoning in the integrated oxidation trap according to claim 2, characterized in that, When the current differential pressure peak ratio is greater than or equal to a preset ratio threshold, the current differential pressure peak is updated.

5. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 1, characterized in that, Before obtaining the inlet temperature of the integrated oxidation trap, the determination method further includes: After the integrated oxidation trap enters the parking regeneration mode, the vehicle engine is controlled to increase the idle speed, and thermal management is performed on the integrated oxidation trap to increase the inlet temperature of the integrated oxidation trap.

6. The method for determining sulfur poisoning in an integrated oxidation trap according to claim 1, characterized in that, After the inlet temperature is greater than the preset fuel injection temperature, the method further includes: Obtain the preset outlet temperature and waste gas mass flow rate of the integrated oxidation trap; The initial fuel injection quantity during parking regeneration is obtained by calculating the inlet temperature of the integrated oxidation trap, the preset outlet temperature, and the exhaust gas mass flow rate. The preset outlet temperature and the model outlet temperature are calculated to obtain the corrected fuel injection quantity during parking regeneration. The model outlet temperature is obtained by model calculation based on the inlet temperature, heat exchange during parking regeneration, and fuel heat. The target fuel injection quantity for parking regeneration is obtained by summing the initial fuel injection quantity and the corrected fuel injection quantity. The vehicle's fuel injection device is controlled to inject fuel based on the target injection quantity, so that the outlet temperature of the integrated oxidation trap reaches the preset outlet temperature.

7. The method for determining sulfur poisoning in the integrated oxidation trap according to claim 6, characterized in that, The calculation of the inlet temperature of the integrated oxidation trap, the preset outlet temperature, and the exhaust gas mass flow rate to obtain the initial fuel injection quantity during parking regeneration includes: The temperature difference between the preset outlet temperature and the inlet temperature of the integrated oxidation trap is calculated to obtain the temperature difference between the front and rear ends of the integrated oxidation trap. The product of the temperature difference between the front and rear ends and the specific heat capacity of the exhaust gas at the outlet of the integrated oxidation trap is calculated, and the product of the product and the mass flow rate of the exhaust gas is calculated to obtain the heat released by the integrated oxidation trap. The specific heat capacity of the exhaust gas at the outlet is obtained by looking up the inlet temperature of the integrated oxidation trap in a table. The initial fuel injection quantity during parking regeneration is obtained by calculating the quotient obtained by dividing the heat released by the integrated oxidation trap by the calorific value of the fuel, and then dividing the quotient by the hydrocarbon conversion efficiency of the integrated oxidation trap.

8. The method for determining sulfur poisoning in the integrated oxidation trap according to claim 6, characterized in that, The calculation of the preset outlet temperature and the model outlet temperature to obtain the corrected fuel injection quantity during parking regeneration includes: The difference between the preset outlet temperature and the model outlet temperature is calculated to obtain the outlet temperature deviation value of the integrated oxidation trap. The corrected fuel injection quantity during parking regeneration is obtained by performing proportional-integral calculation on the outlet temperature deviation value.

9. A sulfur poisoning detection device for an integrated oxidation trap, characterized in that, include: The temperature acquisition module is used to acquire the inlet temperature of the integrated oxidation trap after triggering a parking regeneration request command and entering the parking regeneration mode in response to the vehicle meeting the preset parking conditions and the current carbon load in the integrated oxidation trap of the vehicle being greater than the preset regeneration threshold. The differential pressure acquisition module is used to acquire the differential pressure between the front and rear ends of the integrated oxidation trap when the inlet temperature is greater than the preset fuel injection temperature. The peak monitoring module is used to start the timing device to monitor the pressure difference between the front and rear ends of the integrated oxidation trap at each moment when the pressure difference between the front and rear ends of the integrated oxidation trap meets the preset upward trend, and obtain multiple pressure difference peak values. The ratio calculation module is used to calculate the ratio of two adjacent pressure difference peaks among the multiple pressure difference peaks when the current time exceeds a preset time and the pressure difference between the front and rear ends of the integrated oxidation trap begins to decrease, so as to obtain multiple pressure difference peak ratios. The poisoning determination module is used to determine that the integrated oxidation trap is poisoned by sulfur if the cumulative number of times the peak pressure difference ratio is less than a preset ratio threshold is greater than a preset number.

10. A vehicle, characterized in that, include: Integrated oxidation trap; engine; as well as The sulfur poisoning detection device as described in claim 9.

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