Hydrocarbon detoxification methods, devices, storage media, and products for post-treatment systems

Abstract

This application provides a method, apparatus, storage medium, and product for hydrocarbon detoxification of an aftertreatment system. The method, after determining the end of the active regeneration phase of the vehicle, obtains the cumulative hydrocarbon exposure of the pre-stage SCR catalyst in the aftertreatment system after the last hydrocarbon detoxification. When the cumulative hydrocarbon exposure is greater than or equal to a preset parameter, the vehicle's engine is controlled to continuously emit exhaust gas at a temperature greater than or equal to a preset temperature for a preset duration to detoxify the pre-stage SCR catalyst. This avoids the problem of reduced nitrogen oxide removal efficiency in the aftertreatment system due to hydrocarbon poisoning of the pre-stage SCR catalyst, as seen in existing solutions, thereby ensuring that the dual-injection SCR aftertreatment system meets vehicle exhaust emission requirements. Furthermore, it avoids the application scenario limitations of existing treatment solutions, reduces treatment and maintenance costs, and thus improves the economics of the aftertreatment system.

Description

Technical Field

[0001] This application relates to the field of engine control technology, and in particular to a method, apparatus, storage medium and product for hydrocarbon detoxification of an aftertreatment system. Background Technology

[0002] Aftertreatment systems centered around selective catalytic reduction (SCR) can effectively reduce the emission of nitrogen oxides (NOx) in diesel engine exhaust. Therefore, dual-injection SCR aftertreatment systems can meet increasingly stringent environmental protection requirements.

[0003] Large amounts of hydrocarbons in engine exhaust can poison the SCR catalyst, thereby reducing the nitrogen and oxygen removal efficiency of the aftertreatment system. Existing dual-injection SCR aftertreatment systems include a pre-stage SCR and a post-stage SCR. The post-stage SCR can be detoxified by the high temperatures generated by the active regeneration of the particulate filter located upstream.

[0004] However, since the front-stage SCR needs to come into contact with the engine exhaust gas first, it is prone to hydrocarbon poisoning of the front-stage SCR catalyst. Furthermore, the front-stage SCR cannot be relieved of hydrocarbon poisoning by the high temperature generated by the downstream particulate filter, thereby reducing the nitrogen and oxygen removal efficiency of the aftertreatment system. Summary of the Invention

[0005] This application provides a method, apparatus, storage medium, and product for hydrocarbon detoxification of a post-treatment system, which addresses the defect in existing dual-injection SCR post-treatment systems where the upstream SCR cannot pass through the high temperature generated by the downstream particulate trap to relieve hydrocarbon poisoning of the upstream SCR catalyst, resulting in reduced nitrogen and oxygen removal efficiency of the post-treatment system.

[0006] In a first aspect, embodiments of this application provide a hydrocarbon detoxification method for a post-processing system, comprising:

[0007] Determine whether the vehicle's active regeneration in this phase has ended;

[0008] If the active regeneration has ended, the target parameters of the front-stage SCR catalyst in the vehicle's aftertreatment system after the last completion of hydrocarbon detoxification are obtained. The target parameters include at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration duration, and cumulative amount of hydrocarbons passed through.

[0009] When the target parameter is greater than or equal to the preset parameter, the maximum speed of the engine is determined according to the current driving conditions of the vehicle, so as to control the engine to run at the maximum speed. When the temperature of the exhaust gas does not reach the preset temperature, the heating device in the exhaust pipe of the vehicle is controlled to heat the exhaust gas. The heating device is located before the aftertreatment system to detoxify the hydrocarbons of the pre-stage SCR catalytic converter.

[0010] In one possible implementation, the process of determining the preset parameters includes:

[0011] The nitrogen-oxygen conversion rate of the pre-SCR catalyst was tested as the target parameters of the pre-SCR catalyst were gradually increased.

[0012] The target parameter at which the nitrogen-oxygen conversion rate decreases to a preset nitrogen-oxygen conversion rate is determined as the preset parameter.

[0013] In one possible implementation, when the cumulative hydrocarbon exposure is less than the preset parameter, the post-treatment system is controlled to operate in normal mode.

[0014] In one possible implementation, the process of determining the cumulative amount of hydrocarbons includes:

[0015] Obtain at least one operating condition information of the vehicle's engine between the end of the last hydrocarbon detoxification and the current time, the operating condition information including: engine speed and torque;

[0016] The hydrocarbon emission information corresponding to the operating condition information is obtained from the preset calibration information. The hydrocarbon emission information includes emission concentration and exhaust flow rate.

[0017] Calculate the product of the emission concentration and the exhaust flow rate corresponding to each of the operating conditions, and use it as the amount of hydrocarbons passing through the operating condition.

[0018] The sum of the passing hydrocarbon amounts of at least one of the aforementioned operating conditions is determined as the cumulative passing hydrocarbon amount.

[0019] In one possible implementation, obtaining the hydrocarbon emission information corresponding to the operating condition information from preset calibration information includes:

[0020] The working condition information is matched with the preset working conditions in the preset calibration information to obtain the matching degree;

[0021] Obtain target hydrocarbon emission information for at least one preset operating condition where the matching degree is greater than or equal to the preset matching degree from the preset calibration information;

[0022] The matching degree of the preset operating condition is used as the weight of the target hydrocarbon emission information of the preset operating condition. A weighted average is performed on at least one of the target hydrocarbon emission information to obtain the hydrocarbon emission information corresponding to the operating condition information.

[0023] In one possible implementation, the heating device includes multiple devices, wherein the heating device controlling the exhaust gas in the vehicle's exhaust pipe heats the exhaust gas, including:

[0024] Based on the temperature difference between the exhaust gas temperature and the preset temperature, and the power of the heating device, a target heating device is determined from the plurality of heating devices. The number of target heating devices is positively correlated with the temperature difference and negatively correlated with the power.

[0025] Control the target heating device to start heating.

[0026] Secondly, embodiments of this application provide a hydrocarbon detoxification device for a post-processing system, comprising:

[0027] The acquisition module is used to determine whether the active regeneration of the vehicle in this stage has ended. If the active regeneration has ended, the target parameters of the front-stage SCR catalyst in the aftertreatment system of the vehicle after the last completion of hydrocarbon detoxification are acquired. The target parameters include at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration time, and cumulative amount of hydrocarbons passed through.

[0028] The processing module is used to determine the maximum speed of the engine based on the current driving conditions of the vehicle when the target parameter is greater than or equal to the preset parameter, so as to control the engine to run at the maximum speed, and to control the heating device in the exhaust pipe of the vehicle to heat the exhaust gas when the temperature of the exhaust gas does not reach the preset temperature. The heating device is located before the aftertreatment system to detoxify the hydrocarbons of the pre-stage SCR catalytic converter.

[0029] Thirdly, embodiments of this application provide an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0030] The memory stores computer-executed instructions;

[0031] The processor executes computer execution instructions stored in the memory to implement the hydrocarbon detoxification method of the post-processing system described above.

[0032] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the hydrocarbon detoxification method of the post-processing system described above.

[0033] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the hydrocarbon detoxification method of the post-processing system described above.

[0034] This application provides a method, apparatus, storage medium, and product for hydrocarbon detoxification of an aftertreatment system. After determining the completion of the active regeneration phase of the vehicle, the cumulative hydrocarbon exposure of the pre-stage SCR catalyst in the aftertreatment system after its final hydrocarbon detoxification is obtained. When the cumulative hydrocarbon exposure is greater than or equal to a preset parameter, the vehicle's engine is controlled to continuously emit exhaust gas at a temperature greater than or equal to a preset temperature for a preset duration to detoxify the pre-stage SCR catalyst. This avoids the problem of reduced nitrogen oxide removal efficiency in the aftertreatment system due to hydrocarbon poisoning of the pre-stage SCR catalyst, as seen in existing solutions, thereby ensuring that the dual-injection SCR aftertreatment system meets vehicle exhaust emission requirements. Furthermore, it avoids the application scenario limitations of existing treatment solutions, reduces treatment and maintenance costs, and thus improves the economics of the aftertreatment system. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0036] Figure 1 A schematic diagram of an existing dual-injection SCR aftertreatment system provided in this application;

[0037] Figure 2 Flowchart of the hydrocarbon detoxification method for the post-treatment system provided in this application Figure 1 ;

[0038] Figure 3 Flowchart of the hydrocarbon detoxification method for the post-treatment system provided in this application Figure 2 ;

[0039] Figure 4 A schematic diagram of the hydrocarbon detoxification device for the post-processing system provided in this application;

[0040] Figure 5 A schematic diagram of the structure of the electronic device provided in this application.

[0041] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0042] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0043] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in one or more embodiments of this specification are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of related data must comply with relevant laws, regulations and standards, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0044] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned. They should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0045] With increasingly stringent requirements for vehicle exhaust emissions, dual-injection SCR (Selective Catalytic Reduction) after-treatment systems have become the primary solution for treating vehicle exhaust emissions.

[0046] Figure 1 This is a schematic diagram of an existing dual-injection SCR aftertreatment system, such as... Figure 1 As shown, the dual-injection SCR aftertreatment system includes a pre-stage SCR (Selective Catalytic Reduction) + DOC (Diesel Oxidation Catalyst) + DPF (Diesel Particulate Filter) + post-stage SCR. Both the pre-stage and post-stage SCRs face the risk of catalyst poisoning when dealing with large amounts of hydrocarbons in engine exhaust. When any stage of the SCR catalyst is poisoned, the nitrogen oxide removal efficiency of the aftertreatment system is significantly reduced.

[0047] Hydrocarbon poisoning in SCR catalysts at all stages can usually be relieved by increasing the temperature. After a period of exposure to a high-temperature gas flow, such as 400 degrees Celsius, the nitrogen-oxygen conversion efficiency of a hydrocarbon-poisoned SCR catalyst can be restored to the pre-poisoning level.

[0048] For the downstream SCR in the existing dual-injection SCR system, since an oxidation catalyst and a particulate filter are installed upstream of the downstream SCR, the downstream SCR does not directly face the engine exhaust gas first, thus reducing the risk of hydrocarbon poisoning of the downstream SCR; and the high temperature generated during the active regeneration of the particulate filter is sufficient to relieve hydrocarbon poisoning of the downstream SCR.

[0049] However, the front-stage SCR, located at the very front of the dual-injection SCR system, directly faces the initial engine exhaust gas. When the engine operates under high hydrocarbon emission conditions for a long time, such as in-cylinder post-injection active regeneration, the high hydrocarbons in the initial engine exhaust gas can easily lead to poisoning of the front-stage SCR catalyst.

[0050] When detoxification of the upstream SCR catalyst is required, the upstream SCR cannot generate a high-temperature environment through the downstream particulate filter. Furthermore, during normal vehicle operation, it is difficult to guarantee a sufficiently long period of high-temperature initial engine exhaust to detoxify the upstream SCR catalyst from hydrocarbon poisoning. Therefore, existing dual-injection SCR aftertreatment systems are prone to hydrocarbon poisoning of the upstream SCR and cannot effectively detoxify it, resulting in low nitrogen oxide removal efficiency and ultimately preventing the dual-injection SCR aftertreatment system from meeting vehicle exhaust emission requirements.

[0051] In existing technologies, there are solutions to avoid hydrocarbon poisoning of the pre-stage SCR, such as generating a corresponding active regeneration strategy based on the nitrogen oxide concentration values ​​of the engine's exhaust and tailpipes. This solution determines whether the SCR is poisoned by comparing the measured nitrogen oxide conversion rate with a preset nitrogen oxide conversion rate threshold, and then selects different active regeneration modes for treatment after determining the poisoning status.

[0052] An analysis of the existing treatment process reveals that after confirming pre-stage SCR poisoning, bypass pipes need to be installed at both ends of the pre-stage SCR catalyst, with a reversing valve installed in the bypass pipe to reduce the amount of exhaust gas continuing to pass through the pre-stage SCR and thus reduce the degree of hydrocarbon poisoning. However, this treatment method relies on the added bypass pipes and reversing valves to detoxify the pre-stage SCR, limiting its application scenarios. To detoxify the pre-stage SCR, this treatment method also requires cylinder deactivation, which necessitates temporarily stopping the cylinder's fuel supply, ignition, or intake and exhaust. The pre-stage SCR catalyst with hydrocarbon poisoning in the aftertreatment system must be removed separately and heated to detoxify, thus consuming manpower and time, thereby increasing the treatment and maintenance costs.

[0053] In view of this, this application provides a hydrocarbon detoxification method for an aftertreatment system. After determining that the active regeneration of the vehicle in this stage has ended, the cumulative hydrocarbon exposure of the front-stage SCR catalyst in the aftertreatment system after the last hydrocarbon detoxification is obtained. When the cumulative hydrocarbon exposure is greater than or equal to a preset parameter, the vehicle's engine is controlled to continuously emit exhaust gas at a temperature greater than or equal to a preset temperature for a preset duration to detoxify the front-stage SCR catalyst. This avoids the problem of reduced nitrogen oxide removal efficiency of the aftertreatment system due to hydrocarbon poisoning of the front-stage SCR catalyst, as seen in existing solutions, thereby ensuring that the dual-injection SCR aftertreatment system meets vehicle exhaust emission requirements. Furthermore, it avoids the application scenario limitations of existing treatment solutions, reduces treatment and maintenance costs, and thus improves the economics of the aftertreatment system.

[0054] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0055] Figure 2 Flowchart of the hydrocarbon detoxification method for the post-treatment system provided in this application Figure 1 ,like Figure 2 As shown, the method includes:

[0056] S101. Determine whether the active regeneration of the vehicle in this stage has ended.

[0057] Specifically, the carbon load in the DPF (Diesel Particulate Filter) is obtained by the carbon content detector of the vehicle's aftertreatment system, and the obtained carbon load is transmitted to the control unit. If the carbon load is greater than or equal to the preset load, the engine speed is increased to raise the exhaust temperature, thereby helping to burn off the particulate matter in the particulate filter, that is, to perform active regeneration.

[0058] Furthermore, during active regeneration of the vehicle, the carbon load in the particulate filter (DPF) is continuously obtained through the carbon content detector. When the control unit detects that the carbon load is less than the preset load, it controls the engine to return to normal operation, that is, the active regeneration of the vehicle ends. Otherwise, the active regeneration of the vehicle continues and the duration of active regeneration of the vehicle is recorded.

[0059] S102. If the active regeneration has ended, obtain the target parameters of the front-stage SCR catalyst in the vehicle's aftertreatment system after the last completion of hydrocarbon detoxification. The target parameters include at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration time, and cumulative amount of hydrocarbons passed through.

[0060] Specifically, after the vehicle completes the active regeneration of the diesel oxidation catalyst DOC, the target parameters are obtained through the parameter recording database in the control unit of the vehicle aftertreatment system. The parameter recording database stores the cumulative hydrocarbon parameters corresponding to different times.

[0061] Furthermore, the time since the last hydrocarbon poisoning and detoxification of the forestage SCR catalyst is taken as the target time. Based on the target time, the corresponding cumulative hydrocarbon parameters are retrieved from the parameter record database and used as the target parameters.

[0062] Among them, the cumulative hydrocarbon exposure is directly collected by the hydrocarbon exposure detector, the cumulative active regeneration time is the cumulative time of active regeneration before the current time, and the cumulative hydrocarbon amount is obtained by adding the hydrocarbon amount of all operating conditions within the current time and the target time period.

[0063] S103. When the target parameter is greater than or equal to the preset parameter, the maximum speed of the engine is determined according to the current driving conditions of the vehicle, so as to control the engine to run at the maximum speed. When the temperature of the exhaust gas does not reach the preset temperature, the heating device in the exhaust pipe of the vehicle is controlled to heat the exhaust gas. The heating device is located before the aftertreatment system. The engine of the vehicle is controlled to continuously emit exhaust gas with a temperature greater than or equal to the preset temperature for a preset duration to detoxify the hydrocarbons of the front-stage SCR catalytic converter.

[0064] Specifically, after obtaining the corresponding target parameters through the parameter record database, it is checked whether the obtained target parameters are greater than or equal to the preset parameters. In this process, the target parameters can be compared with the preset hydrocarbon exposure, preset active regeneration time, or preset hydrocarbon amount in the preset parameters by means of the accumulated hydrocarbon exposure, accumulated active regeneration time, or accumulated hydrocarbon amount.

[0065] Furthermore, if so, the engine needs to be controlled to enter a preset operating condition, such as running at maximum speed, so that it emits high-temperature exhaust gas. The high-temperature environment generated by the exhaust gas is used to detoxify the hydrocarbons in the front-stage SCR catalytic converter. If not, the current operating condition of the vehicle's engine is maintained. The preset parameters are obtained experimentally, and the preset parameters are negatively correlated with the target parameters.

[0066] This application provides a method for hydrocarbon detoxification of an aftertreatment system. After determining that the active regeneration of the vehicle in this stage has ended, the cumulative hydrocarbon exposure of the front-stage SCR catalyst in the aftertreatment system after the last hydrocarbon detoxification is obtained. When the cumulative hydrocarbon exposure is greater than or equal to a preset parameter, the vehicle's engine is controlled to continuously emit exhaust gas at a temperature greater than or equal to a preset temperature for a preset duration to detoxify the front-stage SCR catalyst. This avoids the problem of reduced nitrogen and oxygen removal efficiency of the aftertreatment system due to hydrocarbon poisoning of the front-stage SCR catalyst, as seen in existing solutions. This ensures that the dual-injection SCR aftertreatment system meets vehicle exhaust emission requirements. Furthermore, it avoids the application scenario limitations of existing treatment solutions, reduces treatment and maintenance costs, thereby improving the economy of the aftertreatment system and meeting environmental protection requirements.

[0067] Figure 3 Flowchart of the hydrocarbon detoxification method for the post-treatment system provided in this application Figure 2 ,like Figure 3 As shown, in this embodiment... Figure 2 Based on the examples, the hydrocarbon detoxification method of the post-treatment system is described in detail, which includes:

[0068] S201. Determine whether the active regeneration of the vehicle in this stage has ended.

[0069] Specifically, the content of this step is the same as that of step S101, and will not be repeated here.

[0070] S202. If the active regeneration has ended, obtain at least one operating condition information of the vehicle's engine between the end of the last hydrocarbon detoxification and the current time.

[0071] Specifically, after the vehicle completes the active regeneration of the diesel oxidation catalyst (DOC), the target time for completing the active regeneration is obtained, and the vehicle's operating condition information between the target time and the current time is also obtained. This operating condition information indicates the changing trends of the vehicle's operating speed and torque between the target time and the current time.

[0072] S203. Obtain hydrocarbon emission information corresponding to the operating condition information from the preset calibration information. The hydrocarbon emission information includes emission concentration and exhaust flow rate.

[0073] Specifically, after obtaining the operating condition information, the operating condition information is matched with the preset operating conditions in the preset calibration information to obtain the matching degree. The matching degree is used to indicate the similarity between the changing trends of vehicle speed and torque in the operating condition information and the changing trends of speed and torque indicated by the preset operating conditions.

[0074] Furthermore, the preset calibration information includes multiple sets of different preset operating conditions and corresponding hydrocarbon emission information. The hydrocarbon emission information of at least one preset operating condition with a matching degree greater than or equal to the preset matching degree is obtained from the preset calibration information and used as the target hydrocarbon emission information.

[0075] Furthermore, when the matching degree is zero, that is, the operating condition is not within a series of operating conditions calibrated on the test bench, the average value of the hydrocarbon emission information corresponding to the surrounding operating conditions is taken as the corresponding hydrocarbon emission information.

[0076] Furthermore, the matching degree of the preset operating conditions is used as the weight of the target hydrocarbon emission information of the preset operating conditions. A weighted average is performed on at least one target hydrocarbon emission information. For example, for operating conditions with a matching degree of 80%, the emission concentration and exhaust flow rate in the operating conditions are multiplied by the weight of 80% respectively, and the corresponding emission concentration and exhaust flow rate are used as hydrocarbon emission information.

[0077] S204. Calculate the product of the emission concentration and the exhaust flow rate corresponding to each of the operating conditions, and use it as the amount of hydrocarbons passing through the operating condition.

[0078] Specifically, after obtaining the hydrocarbon emission information corresponding to the operating condition information, the product of the weighted average emission concentration and the weighted average exhaust flow rate in the hydrocarbon emission information is obtained as the amount of hydrocarbon passing through the operating condition information.

[0079] S205. The sum of the passing hydrocarbon amounts of at least one of the operating condition information is determined as the cumulative passing hydrocarbon amount.

[0080] Specifically, if the vehicle switches between multiple different operating conditions between the target time and the current time, the operating condition information corresponding to each operating condition is obtained, and the corresponding hydrocarbon emission information is obtained based on the different operating condition information. Then, the amount of hydrocarbons passing through the corresponding operating condition information is obtained based on each hydrocarbon emission information. The sum of the amount of hydrocarbons passing through the different operating condition information is used as the cumulative amount of hydrocarbons passing through, and the cumulative amount of hydrocarbons passing through is recorded as a target parameter in the parameter recording database.

[0081] S206. Test the nitrogen and oxygen conversion rate of the pre-stage SCR catalyst as the target parameters of the pre-stage SCR catalyst are gradually increased.

[0082] Specifically, after obtaining the target parameters, including the cumulative amount of hydrocarbons passed, the target parameters are compared with preset parameters, which are obtained through bench tests or simulation calculations.

[0083] Furthermore, during bench tests or simulation calculations, the target parameters, including the cumulative amount of hydrocarbons passing through, are gradually increased according to preset intervals. This results in a gradual decrease in the nitrogen-oxygen conversion rate of the pre-stage SCR catalyst as the target parameters, such as the cumulative amount of hydrocarbons passing through, are increased. The nitrogen-oxygen conversion rate after each decrease is recorded.

[0084] S207. The target parameter at which the nitrogen-oxygen conversion rate decreases to the preset nitrogen-oxygen conversion rate is determined as the preset parameter.

[0085] Specifically, the target parameter, including the cumulative amount of hydrocarbons passing through, is gradually increased according to the preset interval adjustment amount to gradually reduce the nitrogen-oxygen conversion rate of the front-stage SCR catalyst. When the nitrogen-oxygen conversion rate of the front-stage SCR decreases by 10% to 15%, the target parameter, including the cumulative amount of hydrocarbons passing through, of the front-stage SCR catalyst is recorded as the preset parameter.

[0086] Furthermore, the decrease value can of course be set to other values, which can be determined according to the requirements of the aftertreatment system. Generally, it is the emission engineering margin set when the aftertreatment system is developed.

[0087] S208. When the cumulative hydrocarbon exposure is greater than or equal to a preset parameter, determine the maximum speed of the engine based on the current road conditions of the vehicle, so as to control the engine to run at the maximum speed.

[0088] Specifically, based on the target time since the last hydrocarbon poisoning and detoxification of the forestage SCR catalyst, target parameters including cumulative hydrocarbon throughput, cumulative hydrocarbon exposure, or cumulative active regeneration time are obtained from the parameter recording database. Then, it is checked whether the obtained target parameters are greater than or equal to preset parameters. That is, it is checked whether the cumulative hydrocarbon throughput, cumulative hydrocarbon exposure, or cumulative active regeneration time are greater than or equal to the corresponding preset hydrocarbon exposure, preset active regeneration time, or preset hydrocarbon throughput.

[0089] If so, enter the hydrocarbon poisoning relief mode. At this time, adjust the engine to enter the preset operating condition, such as the high exhaust temperature condition or the maximum speed condition, and run for a preset time, such as ten to thirty minutes, so that the generated high temperature engine exhaust gas can generate a temperature environment that meets the working temperature, such as 400 degrees Celsius, for the front-stage SCR catalytic converter.

[0090] Specifically, for the maximum operating speed, the system obtains the road segment information ahead of the current location from the map information, determines the road condition information based on the road segment information ahead, and confirms the corresponding maximum operating speed based on the road condition information.

[0091] S209. When the temperature of the exhaust gas does not reach the preset temperature, control the heating device in the exhaust pipe of the vehicle to heat the exhaust gas.

[0092] Specifically, after detecting that the target parameter is greater than or equal to the preset parameter, the system enters the hydrocarbon poisoning relief mode to adjust the engine to operate under preset conditions for a preset time. Then, it continuously monitors whether the temperature environment of the front-stage SCR catalyst reaches the preset temperature, such as 400 degrees Celsius.

[0093] Furthermore, if the preset temperature is reached after a preset running time, the current preset engine operating conditions are maintained until the hydrocarbon poisoning of the pre-stage SCR catalytic converter is resolved; if the preset temperature is not reached after a preset running time, the heating device in the exhaust pipe is controlled by the control unit to heat the exhaust gas until the temperature environment of the pre-stage SCR catalytic converter is detected to reach the preset temperature, wherein the heating device is located before the aftertreatment system.

[0094] Furthermore, for heating exhaust gas through heating equipment, a target heating device is determined from multiple heating devices based on the temperature difference between the exhaust gas temperature and the preset temperature, as well as the power of the heating equipment, and the target heating device is controlled to start heating. The number of target heating devices is positively correlated with the temperature difference and negatively correlated with the power.

[0095] S210. When the cumulative hydrocarbon exposure is less than the preset parameter, control the post-treatment system to operate in normal mode.

[0096] Specifically, after obtaining target parameters such as cumulative hydrocarbon throughput, cumulative hydrocarbon exposure, or cumulative active regeneration time from the parameter recording database based on the target time, if the cumulative hydrocarbon throughput, cumulative hydrocarbon exposure, or cumulative active regeneration time is detected to be less than the corresponding preset hydrocarbon exposure, preset active regeneration time, or preset hydrocarbon throughput, the system enters normal mode.

[0097] Furthermore, in normal mode, the current vehicle operating condition is maintained to avoid affecting the normal operation of the vehicle. At this time, it is confirmed that the hydrocarbons in the front-stage SCR catalyst are not poisoned, and there is no need to intervene to control the vehicle to enter the preset operating condition, thus avoiding the impact on the driving experience due to the operating condition corresponding to the hydrocarbon poisoning relief mode.

[0098] This application provides a method for hydrocarbon detoxification of an aftertreatment system. After determining that the active regeneration of the vehicle in this stage has ended, the cumulative hydrocarbon exposure of the front-stage SCR catalyst in the aftertreatment system after the last hydrocarbon detoxification is obtained. When the cumulative hydrocarbon exposure is greater than or equal to a preset parameter, the vehicle's engine is controlled to continuously emit exhaust gas at a temperature greater than or equal to a preset temperature for a preset duration to detoxify the front-stage SCR catalyst. This avoids the problem of reduced nitrogen and oxygen removal efficiency of the aftertreatment system due to hydrocarbon poisoning of the front-stage SCR catalyst, as seen in existing solutions, thereby ensuring that the dual-injection SCR aftertreatment system meets vehicle exhaust emission requirements. Furthermore, it avoids the application scenario limitations of existing treatment solutions, reduces treatment and maintenance costs, and thus improves the economy of the aftertreatment system.

[0099] Figure 4 A schematic diagram of the hydrocarbon detoxification device of the post-processing system provided in this application is shown below. Figure 4 As shown, the device 40 includes:

[0100] The acquisition module 401 is used to determine whether the active regeneration of the vehicle in this stage has ended. If the active regeneration has ended, the target parameters of the front-stage SCR catalyst in the aftertreatment system of the vehicle after the last completion of hydrocarbon detoxification are acquired. The target parameters include at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration time, and cumulative amount of hydrocarbons passed through.

[0101] The processing module 402 is used to determine the maximum speed of the engine according to the current driving conditions of the vehicle when the target parameter is greater than or equal to the preset parameter, so as to control the engine to run at the maximum speed, and to control the heating device in the exhaust pipe of the vehicle to heat the exhaust gas when the temperature of the exhaust gas does not reach the preset temperature. The heating device is located before the aftertreatment system to detoxify the hydrocarbons of the pre-stage SCR catalyst.

[0102] In one possible implementation, the processing module 402 is specifically used to test the nitrogen-oxygen conversion rate of the front-stage SCR catalyst as the target parameters of the front-stage SCR catalyst gradually increase.

[0103] The target parameter at which the nitrogen-oxygen conversion rate decreases to a preset nitrogen-oxygen conversion rate is determined as the preset parameter.

[0104] In one possible implementation, the processing module 402 is further configured to control the post-processing system to operate in normal mode when the cumulative hydrocarbon exposure is less than the preset parameter.

[0105] The processing module 402 is specifically used to acquire at least one operating condition information of the vehicle's engine between the end of the last hydrocarbon detoxification and the current time, the operating condition information including: engine speed and torque;

[0106] The hydrocarbon emission information corresponding to the operating condition information is obtained from the preset calibration information. The hydrocarbon emission information includes emission concentration and exhaust flow rate.

[0107] Calculate the product of the emission concentration and the exhaust flow rate corresponding to each of the operating conditions, and use it as the amount of hydrocarbons passing through the operating condition.

[0108] The sum of the passing hydrocarbon amounts of at least one of the aforementioned operating conditions is determined as the cumulative passing hydrocarbon amount.

[0109] In one possible implementation, the processing module 402 is specifically used to match the working condition information with the preset working conditions in the preset calibration information to obtain a matching degree.

[0110] Obtain target hydrocarbon emission information for at least one preset operating condition where the matching degree is greater than or equal to the preset matching degree from the preset calibration information;

[0111] The matching degree of the preset operating condition is used as the weight of the target hydrocarbon emission information of the preset operating condition. A weighted average is performed on at least one of the target hydrocarbon emission information to obtain the hydrocarbon emission information corresponding to the operating condition information.

[0112] In one possible implementation, the processing module 402 is specifically configured to determine a target heating device from the plurality of heating devices based on the temperature difference between the exhaust gas temperature and the preset temperature, and the power of the heating device, wherein the number of the target heating devices is positively correlated with the temperature difference and negatively correlated with the power.

[0113] Control the target heating device to start heating.

[0114] The hydrocarbon detoxification device of the post-processing system provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0115] Figure 5 A schematic diagram of the structure of the electronic device provided in this application. Figure 5 As shown, the electronic device 50 provided in this embodiment includes at least one processor 501 and a memory 502. Optionally, the device 50 further includes a communication component 503. The processor 501, memory 502, and communication component 503 are connected via a bus 504.

[0116] In a specific implementation, at least one processor 501 executes computer execution instructions stored in memory 502, causing at least one processor 501 to perform the above-described method.

[0117] The specific implementation process of processor 501 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0118] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0119] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0120] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0121] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0122] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0123] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0124] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0125] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0126] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0127] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0128] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0129] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0130] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for hydrocarbon detoxification in a post-treatment system, characterized in that, include: Determine whether the vehicle's active regeneration in this phase has ended; If the active regeneration has ended, the target parameters of the front-stage SCR catalyst in the vehicle's aftertreatment system after the last completion of hydrocarbon detoxification are obtained. The target parameters include at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration duration, and cumulative amount of hydrocarbons passed through. When the target parameter is greater than or equal to the preset parameter, the maximum speed of the engine is determined according to the current driving conditions of the vehicle, so as to control the engine to run at the maximum speed. When the temperature of the exhaust gas does not reach the preset temperature, the heating device in the exhaust pipe of the vehicle is controlled to heat the exhaust gas. The heating device is located before the after-treatment system to detoxify the hydrocarbons of the front-stage SCR catalyst. The accumulation process for determining hydrocarbon content includes: Obtain at least one operating condition information of the vehicle's engine between the end of the last hydrocarbon detoxification and the current time, the operating condition information including: engine speed and torque; The hydrocarbon emission information corresponding to the operating condition information is obtained from the preset calibration information. The hydrocarbon emission information includes emission concentration and exhaust flow rate. Calculate the product of the emission concentration and the exhaust flow rate corresponding to each of the operating conditions, and use it as the amount of hydrocarbons passing through the operating condition. The sum of the passing hydrocarbon amounts of at least one of the aforementioned operating conditions is determined as the cumulative passing hydrocarbon amount.

2. The method according to claim 1, characterized in that, The process of determining the preset parameters includes: The nitrogen-oxygen conversion rate of the pre-SCR catalyst was tested as the target parameters of the pre-SCR catalyst were gradually increased. The target parameter at which the nitrogen-oxygen conversion rate decreases to a preset nitrogen-oxygen conversion rate is determined as the preset parameter.

3. The method according to claim 1, characterized in that, Also includes: When the cumulative hydrocarbon exposure is less than the preset parameter, the post-treatment system is controlled to operate in normal mode.

4. The method according to claim 1, characterized in that, The step of obtaining the hydrocarbon emission information corresponding to the operating condition information from the preset calibration information includes: The working condition information is matched with the preset working conditions in the preset calibration information to obtain the matching degree; Obtain target hydrocarbon emission information for at least one preset operating condition where the matching degree is greater than or equal to the preset matching degree from the preset calibration information; The matching degree of the preset operating condition is used as the weight of the target hydrocarbon emission information of the preset operating condition. A weighted average is performed on at least one of the target hydrocarbon emission information to obtain the hydrocarbon emission information corresponding to the operating condition information.

5. The method according to claim 1, characterized in that, The heating device includes multiple components, and the heating device in the vehicle's exhaust pipe heats the exhaust gas, including: Based on the temperature difference between the exhaust gas temperature and the preset temperature, and the power of the heating device, a target heating device is determined from a plurality of heating devices. The number of target heating devices is positively correlated with the temperature difference and negatively correlated with the power. Control the target heating device to start heating.

6. A hydrocarbon detoxification device for a post-treatment system, characterized in that, include: The acquisition module is used to determine whether the active regeneration of the vehicle in this stage has ended. If the active regeneration has ended, the target parameters of the front-stage SCR catalyst in the aftertreatment system of the vehicle after the last completion of hydrocarbon detoxification are acquired. The target parameters include at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration time, and cumulative amount of hydrocarbons passed through. The processing module is used to determine the maximum engine speed according to the current driving conditions of the vehicle when the target parameter is greater than or equal to the preset parameter, so as to control the engine to run at the maximum speed, and to control the heating device in the exhaust pipe of the vehicle to heat the exhaust gas when the exhaust gas temperature does not reach the preset temperature. The heating device is located before the aftertreatment system to detoxify the hydrocarbons of the front-stage SCR catalyst. The processing module is further configured to acquire at least one operating condition information of the vehicle's engine between the end of the last hydrocarbon detoxification and the current time, the operating condition information including: engine speed and torque; acquire hydrocarbon emission information corresponding to the operating condition information from preset calibration information, the hydrocarbon emission information including: emission concentration and exhaust flow rate; calculate the product of the emission concentration and the exhaust flow rate corresponding to each operating condition information as the amount of hydrocarbon passing through the operating condition information; and determine the sum of the amount of hydrocarbon passing through at least one operating condition information as the cumulative amount of hydrocarbon passing through.

7. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1 to 5.

9. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 5.

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