Hydrocarbon detoxification method and device of aftertreatment system, storage medium and product

Abstract

The invention provides a hydrocarbon detoxification method and device of a post-treatment system, a storage medium and a product. The method comprises the steps that after it is determined that active regeneration of a vehicle at the stage is finished, the accumulated hydrocarbon exposure amount of a preceding-stage SCR catalyst in a post-treatment system after hydrocarbon detoxification is completed for the last time is obtained; and when the accumulated hydrocarbon exposure amount is larger than or equal to the preset parameter, an engine of the vehicle is controlled to continuously discharge tail gas with the temperature larger than or equal to the preset temperature within the preset duration so as to conduct hydrocarbon detoxification on a preceding-stage SCR catalyst, and therefore the problem that in an existing scheme, due to hydrocarbon poisoning of the preceding-stage SCR catalyst, the emission temperature is larger than or equal to the preset temperature is solved. Therefore, it is ensured that the double-injection SCR aftertreatment system meets the tail gas emission requirement of a vehicle. And moreover, the limitation of an application scene in an existing processing scheme is avoided, and the processing and maintenance cost is reduced, so that the economical efficiency of a post-processing system is improved.

Description

Technical Field

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

[0002] The post-treatment system with Selective Catalytic Reduction (SCR) as the core can effectively reduce the emission of nitrogen oxides (NOX) in diesel engine exhaust. Therefore, the dual-injection SCR post-treatment system can meet the ever-increasing environmental protection requirements.

[0003] A large amount of hydrocarbons in the engine exhaust will cause SCR catalyst poisoning, thereby reducing the nitrogen and oxygen removal efficiency of the post-treatment system. The existing dual-injection SCR post-treatment system includes a front-stage SCR and a rear-stage SCR. The rear-stage SCR can remove the hydrocarbon poisoning of the rear-stage SCR catalyst through the high temperature generated by the active regeneration of the upstream particulate filter.

[0004] However, since the front-stage SCR needs to contact the engine exhaust first, it is easy to cause carbon and hydrogen poisoning of the front-stage SCR catalyst, and the front-stage SCR cannot eliminate the carbon and hydrogen poisoning of the front-stage SCR catalyst through the high temperature generated by the particulate filter installed downstream, thereby reducing the nitrogen and oxygen removal efficiency of the post-treatment system. Summary of the invention

[0005] The embodiments of the present application provide a hydrocarbon detoxification method, device, storage medium and product for an after-treatment system, so as to solve the defect that the nitrogen and oxygen removal efficiency of the after-treatment system is reduced because the front-stage SCR in the existing dual-injection SCR after-treatment system cannot be relieved from the hydrocarbon poisoning of the front-stage SCR catalyst by the high temperature generated by the particulate filter arranged downstream.

[0006] In a first aspect, an embodiment of the present application provides a hydrocarbon detoxification method for a post-treatment system, comprising:

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

[0008] If the active regeneration has ended, obtaining a target parameter of a front-stage SCR catalyst in a post-treatment system of the vehicle after the last completion of hydrocarbon detoxification, wherein the target parameter includes at least one of the following: a cumulative hydrocarbon exposure amount, a cumulative active regeneration time, and a cumulative amount of hydrocarbons passed;

[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 condition of the vehicle to control the engine to run at the maximum speed, and 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, and the heating device is located before the after-treatment system to perform hydrocarbon detoxification on the front-stage SCR catalyst.

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

[0011] Testing the nitrogen oxygen conversion rate of the front-stage SCR catalyst during the process of gradually increasing the target parameter of the front-stage SCR catalyst;

[0012] The target parameter when the nitrogen oxygen conversion rate drops to a preset nitrogen oxygen conversion rate is determined as the preset parameter.

[0013] In a possible implementation manner, when the accumulated hydrocarbon exposure amount is less than the preset parameter, the aftertreatment system is controlled to operate in a normal mode.

[0014] In a possible implementation, the process of determining the accumulated amount of carbon and hydrogen includes:

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

[0016] Acquire hydrocarbon emission information corresponding to the operating condition information from preset calibration information, wherein the hydrocarbon emission information includes: emission concentration and exhaust flow rate;

[0017] Calculating the product of the emission concentration and the exhaust flow rate corresponding to each of the operating condition information as the passing hydrocarbon amount of the operating condition information;

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

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

[0020] Matching the operating condition information with the preset operating condition in the preset calibration information to obtain a matching degree;

[0021] Acquire target hydrocarbon emission information of at least one preset operating condition whose matching degree is greater than or equal to a 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, and weighted averaging 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 a possible implementation manner, the heating device includes a plurality of heating devices, and the heating device in the exhaust pipe of the vehicle is controlled to heat the exhaust gas, including:

[0024] Determining a target heating device from the plurality of heating devices according to a temperature difference between the temperature of the exhaust gas and the preset temperature, and a power of the heating device, wherein the number of the target heating devices is positively correlated to the temperature difference and negatively correlated to the power;

[0025] The target heating device is controlled to start heating.

[0026] In a second aspect, an embodiment of the present application provides a hydrocarbon detoxification device of a post-treatment system, comprising:

[0027] An acquisition module is used to determine whether the active regeneration of the vehicle at this stage has ended. If the active regeneration has ended, a target parameter of the front-stage SCR catalyst in the post-treatment system of the vehicle after the last completion of hydrocarbon detoxification is acquired, wherein the target parameter includes at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration time, and cumulative passing hydrocarbon amount;

[0028] A processing module 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, wherein the heating device is located before the after-treatment system to perform hydrocarbon detoxification on the front-stage SCR catalyst.

[0029] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0030] The memory stores computer-executable instructions;

[0031] The processor executes the computer-executable instructions stored in the memory to implement the hydrocarbon detoxification method of the post-treatment system.

[0032] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the hydrocarbon detoxification method of the post-treatment system as described above.

[0033] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the above-mentioned hydrocarbon detoxification method for the after-treatment system.

[0034] The present application provides a method, device, storage medium and product 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 completion of hydrocarbon detoxification is obtained. When the cumulative hydrocarbon exposure is greater than or equal to the preset parameter, the engine of the vehicle is controlled to continuously emit exhaust gas with a temperature greater than or equal to the preset temperature within a preset time period to perform hydrocarbon detoxification on the front-stage SCR catalyst, so as to avoid the problem of reduced nitrogen and oxygen removal efficiency of the aftertreatment system due to hydrocarbon poisoning of the front-stage SCR catalyst in the existing solution, thereby ensuring that the dual-injection SCR aftertreatment system meets the vehicle exhaust emission requirements; and avoiding the limitations of application scenarios in the existing treatment scheme, reducing treatment and maintenance costs, thereby improving the economy of the aftertreatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[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 post-treatment system provided for this application;

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

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

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

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

[0041] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present 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, stored data, displayed data, 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, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards, and corresponding operation entrances shall be 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, and 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 the continuous improvement of vehicle exhaust emission requirements, the dual-injection SCR (Selective Catalytic Reduction) after-treatment system has become the main treatment solution for vehicle exhaust.

[0046] Figure 1 It is a schematic diagram of the existing dual-injection SCR post-treatment system. Figure 1 As shown in the figure, the dual-injection SCR post-treatment solution includes front-stage SCR (Selective Catalytic Reduction) + DOC (Diesel Oxidation Catalyst) + DPF (Diesel Particulate Filter) + rear-stage SCR. For the front-stage SCR and the rear-stage SCR, when faced with a large amount of hydrocarbons in the engine exhaust, both the front-stage SCR and the rear-stage SCR face the risk of causing SCR catalyst poisoning. When the SCR catalysts at each stage are poisoned, the nitrogen and oxygen removal efficiency of the post-treatment system will be greatly reduced.

[0047] Hydrocarbon poisoning of each level of SCR catalyst can usually be eliminated by raising the temperature. After a period of high-temperature airflow, such as airflow at 400 degrees Celsius, the nitrogen-oxygen conversion efficiency of the SCR catalyst poisoned by hydrocarbons can be restored to the level before the poisoning.

[0048] For the rear-stage SCR in the existing dual-injection SCR system, since an oxidation catalyst and a particulate filter are arranged upstream of the rear-stage SCR, the rear-stage SCR does not directly face the engine exhaust first, thereby reducing the risk of hydrocarbon poisoning of the rear-stage SCR; and when the particulate filter is actively regenerated, the high temperature generated is sufficient to eliminate the hydrocarbon poisoning of the rear-stage SCR.

[0049] However, the front-stage SCR installed at the front end of the dual-injection SCR system directly faces the initial engine exhaust. When the engine runs for a long time in high-carbon and hydrogen emission conditions such as active regeneration of post-injection in the cylinder, the high carbon and hydrogen in the exhaust gas discharged by the initial engine can easily lead to poisoning of the front-stage SCR catalyst.

[0050] When the front-stage SCR catalyst needs to be detoxified, the front-stage SCR cannot generate a high-temperature environment through the particulate filter set downstream, and when the vehicle is running normally, it is difficult to ensure that there is a long enough period of high-temperature initial engine exhaust to remove the hydrocarbon poisoning of the front-stage SCR catalyst. Therefore, the existing dual-injection SCR after-treatment system is prone to hydrocarbon poisoning for the front-stage SCR, and cannot effectively detoxify after the front-stage SCR is poisoned by hydrocarbons, resulting in the nitrogen and oxygen removal efficiency of the after-treatment system, and thus the dual-injection SCR after-treatment system cannot meet the vehicle exhaust emission requirements.

[0051] In the prior art, there are solutions to avoid hydrocarbon poisoning of the front-stage SCR, such as generating a solution corresponding to the active regeneration strategy based on the nitrogen oxide concentration values ​​of the engine's original and tail exhausts. This solution compares the measured nitrogen oxide conversion rate with the preset nitrogen oxide conversion rate threshold to determine whether the SCR is poisoned, and after determining the poisoning situation, selects a different active regeneration mode for processing.

[0052] An analysis of the working process of the existing treatment scheme shows that after determining that the front-stage SCR is poisoned, it is necessary to set a bypass pipe at both ends of the front-stage SCR catalyst and install a reversing valve in the bypass pipe to reduce the exhaust gas that continues to pass through the front-stage SCR and reduce the degree of hydrocarbon poisoning of the front-stage SCR. However, this treatment scheme requires the addition of a bypass pipe and a reversing valve to eliminate the hydrocarbon poisoning of the front-stage SCR, which limits the application scenario. In order to eliminate the poisoning of the front-stage SCR, the treatment scheme also requires the engine to be cylinder-cut off. The engine cylinder-cut off treatment requires temporarily stopping the fuel supply, ignition or intake and exhaust of the cylinder, and taking out the hydrocarbon-poisoned front-stage SCR catalyst in the after-treatment system separately for heating treatment to eliminate the poisoning of the front-stage SCR. Therefore, it consumes manpower and time to handle, resulting in an increase in the treatment and maintenance costs.

[0053] In view of this, the present application provides a method for hydrocarbon detoxification of an aftertreatment system, which obtains the cumulative hydrocarbon exposure of the front-stage SCR catalyst in the aftertreatment system after the last completion of hydrocarbon detoxification after determining that the active regeneration of the vehicle in this stage has ended. When the cumulative hydrocarbon exposure is greater than or equal to the preset parameter, the engine of the vehicle is controlled to continuously emit exhaust gas with a temperature greater than or equal to the preset temperature within a preset time period to perform hydrocarbon detoxification on the front-stage SCR catalyst, so as to avoid the problem of reduced nitrogen and oxygen removal efficiency of the aftertreatment system due to hydrocarbon poisoning of the front-stage SCR catalyst in the existing solution, thereby ensuring that the dual-injection SCR aftertreatment system meets the vehicle exhaust emission requirements; and avoids the limitations of application scenarios in the existing treatment scheme, reduces treatment and maintenance costs, and thus improves the economy of the aftertreatment system.

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

[0055] Figure 2 Schematic diagram of the process of 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 active regeneration of the vehicle at this stage has ended.

[0057] Specifically, the carbon load in the DPF is obtained through the carbon load detector of the vehicle's after-treatment 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 is controlled to increase the speed to increase the exhaust temperature, thereby helping to burn the particulate matter in the particulate filter, that is, active regeneration is performed.

[0058] Furthermore, when the vehicle is actively regenerating, the carbon load in the particulate filter DPF is continuously obtained through the carbon detector, and when the control unit detects that the carbon load is less than the preset load, the engine is controlled to restore normal operating conditions, that is, the active regeneration of the vehicle is ended, otherwise the vehicle maintains active regeneration and the duration of the vehicle's active regeneration is recorded.

[0059] S102. If the active regeneration has ended, then obtaining target parameters of the front-stage SCR catalyst in the aftertreatment system of the vehicle after the last completion of hydrocarbon detoxification, the target parameters including at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration time, and cumulative passing hydrocarbon amount.

[0060] Specifically, after the vehicle completes 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 post-treatment system, wherein the parameter recording database stores the accumulated hydrocarbon parameters corresponding to different times.

[0061] Furthermore, the time after the last carbon-hydrogen poisoning and detoxification of the front-stage SCR catalyst is taken as the target time, and the corresponding accumulated carbon-hydrogen parameter is queried in the parameter record database according to the target time as the target parameter.

[0062] Among them, the cumulative hydrocarbon exposure amount is directly collected and obtained by the hydrocarbon exposure detector, the cumulative active regeneration time is the cumulative time for active regeneration before the current time, and the cumulative passing hydrocarbon amount is obtained by accumulating the hydrocarbon amount of all working conditions between the current time and the target time period.

[0063] S103. When the target parameter is greater than or equal to a preset parameter, the maximum speed of the engine is determined according to the current driving condition of the vehicle to control the engine to run at the maximum speed, and 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, and the heating device is located before the after-treatment system, and the engine of the vehicle is controlled to continuously emit exhaust gas with a temperature greater than or equal to a preset temperature within a preset time period, so as to detoxify the front-stage SCR catalyst.

[0064] Specifically, after obtaining the corresponding target parameters through querying the parameter record database, it is detected whether the obtained target parameters are greater than or equal to the preset parameters. When detecting whether the target parameters are greater than or equal to the preset parameters, the accumulated hydrocarbon exposure amount, the accumulated active regeneration time or the accumulated passing hydrocarbon amount can be compared with the preset hydrocarbon exposure amount, the preset active regeneration time or the preset passing hydrocarbon amount in the preset parameters.

[0065] Furthermore, if yes, it is necessary to control the engine to enter a preset operating condition, such as controlling the engine to run at the maximum speed, so that the engine discharges high-temperature exhaust gas, and the high-temperature environment generated by the high-temperature exhaust gas is used to achieve hydrocarbon detoxification of the front-stage SCR catalyst; if no, the current vehicle engine operating condition is maintained. The preset parameters are obtained through experiments, and the preset parameters are negatively correlated with the target parameters.

[0066] The embodiment of the present application provides a method for detoxifying hydrocarbons in an after-treatment system. After determining that the active regeneration of the vehicle in this stage has ended, the cumulative exposure of hydrocarbons in the front-stage SCR catalyst in the after-treatment system after the last completion of hydrocarbon detoxification is obtained. When the cumulative exposure of hydrocarbons is greater than or equal to a preset parameter, the engine of the vehicle is controlled to continuously emit exhaust gas with a temperature greater than or equal to a preset temperature within a preset time period to detoxify the front-stage SCR catalyst with hydrocarbons, so as to avoid the problem of reduced nitrogen and oxygen removal efficiency of the after-treatment system due to hydrocarbon poisoning of the front-stage SCR catalyst in the existing solution, thereby ensuring that the dual-injection SCR after-treatment system meets the vehicle exhaust emission requirements; and avoids the limitations of application scenarios in the existing treatment scheme, reduces the treatment and maintenance costs, thereby improving the economy of the after-treatment system and meeting environmental protection requirements.

[0067] Figure 3 Schematic diagram of the process of 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 embodiment, a hydrocarbon detoxification method for a post-treatment system is described in detail, and the method comprises:

[0068] S201. Determine whether active regeneration of the vehicle at 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 engine of the vehicle 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 operating condition information of the vehicle between the target time and the current time is obtained. The operating condition information is used to indicate the change trend of the operating speed and torque corresponding to the operating condition of the vehicle between the target time and the current time.

[0072] S203: Acquire hydrocarbon emission information corresponding to the operating condition information from preset calibration information, where 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 condition in the preset calibration information to obtain a matching degree, wherein the matching degree is used to indicate the similarity between the changing trend of the vehicle speed and torque in the operating condition information and the speed and torque changing trend indicated by the preset operating condition.

[0074] Furthermore, the preset calibration information includes a plurality of different sets of preset operating conditions and corresponding hydrocarbon emission information, and hydrocarbon emission information of at least one preset operating condition with a matching degree greater than or equal to a preset matching degree is obtained from the preset calibration information as 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 by the test bench, the average value of the corresponding hydrocarbon emission information of the surrounding operating points is taken as the corresponding hydrocarbon emission information.

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

[0077] S204: Calculate the product of the emission concentration and the exhaust flow rate corresponding to each operating condition information as the passing hydrocarbon amount of the operating condition information.

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

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

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

[0081] S206 , testing the nitrogen oxygen conversion rate of the front-stage SCR catalyst in the process of gradually increasing the target parameter of the front-stage SCR catalyst.

[0082] Specifically, after the target parameters including the accumulated amount of carbon and hydrogen passing through are obtained, the target parameters are compared with preset parameters, wherein the preset parameters are obtained through bench tests or simulation calculations.

[0083] Furthermore, during the bench test or simulation calculation process, according to the preset interval adjustment amount, the target parameters including the cumulative amount of carbon and hydrogen passing through are gradually increased, so that when the target parameters of the front-stage SCR catalyst such as the cumulative amount of carbon and hydrogen passing through are increased, the nitrogen oxygen conversion rate of the front-stage SCR catalyst is gradually reduced, and the nitrogen oxygen conversion rate after each reduction is recorded.

[0084] S207, determining the target parameter when the nitrogen oxygen conversion rate drops to a preset nitrogen oxygen conversion rate as the preset parameter.

[0085] Specifically, according to the preset interval adjustment amount, the target parameters including the cumulative amount of carbon and hydrogen passing through are gradually increased to gradually reduce the nitrogen oxide conversion rate of the front-stage SCR catalyst, and when the nitrogen oxide conversion rate of the current-stage SCR decreases by 10% to 15%, the target parameters including the cumulative amount of carbon and hydrogen passing through the front-stage SCR catalyst at this time are recorded as preset parameters.

[0086] Furthermore, the reduction value may of course be set to other values, which may be determined according to the requirements of the after-treatment system, and is generally the emission engineering margin set when the after-treatment system is developed.

[0087] S208: When the accumulated hydrocarbon exposure amount is greater than or equal to a preset parameter, determine the maximum speed of the engine according to the current driving condition of the vehicle to control the engine to run at the maximum speed.

[0088] Specifically, according to the target time after the last carbon and hydrogen poisoning and detoxification of the front-stage SCR catalyst, after obtaining the target parameters including the cumulative passing carbon and hydrogen amount, the cumulative carbon and hydrogen exposure amount or the cumulative active regeneration time through the parameter recording database, it is detected whether the obtained target parameters are greater than or equal to the preset parameters, that is, whether the cumulative passing carbon and hydrogen amount, the cumulative carbon and hydrogen exposure amount or the cumulative active regeneration time is greater than or equal to the corresponding preset carbon and hydrogen exposure amount, preset active regeneration time or preset passing carbon and hydrogen amount.

[0089] If so, the hydrocarbon poisoning removal mode is entered, and the engine is adjusted to enter a preset operating condition, such as a high exhaust temperature condition or a maximum speed operating condition, and runs for a preset time, such as ten to thirty minutes, so that the high-temperature engine exhaust gas generated can generate a temperature environment for the front-stage SCR catalyst to meet the operating temperature, such as 400 degrees.

[0090] Among them, for the speed in the maximum speed operating condition, the road section information ahead of the current position is obtained from the map information, and the road condition information is determined based on the road section information ahead, and the corresponding maximum speed is confirmed based on the road condition information.

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

[0092] Specifically, when it is detected that the target parameter is greater than or equal to the preset parameter, the hydrocarbon poisoning release mode is entered to adjust the engine to enter the preset operating conditions and run for a preset time, and then continuously detect whether the temperature environment of the front-stage SCR catalyst reaches a preset temperature, such as 400 degrees.

[0093] Furthermore, if the preset temperature is reached after running for a preset time, the preset operating condition of the current engine is maintained until the hydrocarbon poisoning of the front-stage SCR catalyst is relieved; if the preset temperature is not reached after running for a preset time, the control unit controls the heating device in the exhaust pipe to heat the exhaust gas until it is detected that the temperature environment of the front-stage SCR catalyst reaches the preset temperature, wherein the heating device is located before the after-treatment system.

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

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

[0096] Specifically, after obtaining the target parameters including the cumulative passing carbon and hydrogen amount, the cumulative carbon and hydrogen exposure amount or the cumulative active regeneration time through the parameter recording database according to the target time, if it is detected that the cumulative passing carbon and hydrogen amount, the cumulative carbon and hydrogen exposure amount or the cumulative active regeneration time is less than the corresponding preset carbon and hydrogen exposure amount, the preset active regeneration time or the preset passing carbon and hydrogen amount, the normal mode is entered.

[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 front-stage SCR catalyst is not poisoned by carbon and hydrogen, and there is no need to intervene to control the vehicle to enter the preset operating condition, thereby avoiding the driving experience being affected by the operating condition corresponding to the carbon and hydrogen poisoning release mode.

[0098] The embodiment of the present application provides a method for hydrocarbon detoxification of an aftertreatment system. After determining that the active regeneration of the vehicle at this stage has ended, the cumulative hydrocarbon exposure of the front-stage SCR catalyst in the aftertreatment system after the last completion of hydrocarbon detoxification is obtained. When the cumulative hydrocarbon exposure is greater than or equal to the preset parameter, the engine of the vehicle is controlled to continuously emit exhaust gas with a temperature greater than or equal to the preset temperature within a preset time period to perform hydrocarbon detoxification on the front-stage SCR catalyst, so as to avoid the problem of reduced nitrogen and oxygen removal efficiency of the aftertreatment system due to hydrocarbon poisoning of the front-stage SCR catalyst in the existing solution, thereby ensuring that the dual-injection SCR aftertreatment system meets the vehicle exhaust emission requirements; and avoiding the limitations of application scenarios in the existing treatment scheme, reducing treatment and maintenance costs, thereby improving the economy of the aftertreatment system.

[0099] Figure 4 The structural schematic diagram of the hydrocarbon detoxification device of the post-treatment system provided in this application is as follows: Figure 4 As shown, the device 40 includes:

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

[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, wherein the heating device is located before the after-treatment system to perform hydrocarbon detoxification on the front-stage SCR catalyst.

[0102] In a possible implementation, the processing module 402 is specifically used to test the nitrogen oxide conversion rate of the front-stage SCR catalyst during the process of gradually increasing the target parameter of the front-stage SCR catalyst;

[0103] The target parameter when the nitrogen oxygen conversion rate drops to a preset nitrogen oxygen conversion rate is determined as the preset parameter.

[0104] In a possible implementation, the processing module 402 is further configured to control the aftertreatment system to operate in a normal mode when the accumulated hydrocarbon exposure amount is less than the preset parameter.

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

[0106] Acquire hydrocarbon emission information corresponding to the operating condition information from preset calibration information, wherein the hydrocarbon emission information includes: emission concentration and exhaust flow rate;

[0107] Calculating the product of the emission concentration and the exhaust flow rate corresponding to each of the operating condition information as the passing hydrocarbon amount of the operating condition information;

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

[0109] In a possible implementation, the processing module 402 is specifically configured to match the operating condition information with a preset operating condition in the preset calibration information to obtain a matching degree;

[0110] Acquire target hydrocarbon emission information of at least one preset operating condition whose matching degree is greater than or equal to a 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, and weighted averaging 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 a possible implementation, the processing module 402 is specifically configured to determine a target heating device from the plurality of heating devices according to a temperature difference between the temperature of the exhaust gas and the preset temperature, and a power of the heating device, wherein the number of the target heating devices is positively correlated to the temperature difference and negatively correlated to the power;

[0113] The target heating device is controlled to start heating.

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

[0115] Figure 5 This is 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 also includes a communication component 503. The processor 501, the memory 502 and the communication component 503 are connected via a bus 504.

[0116] In a specific implementation process, at least one processor 501 executes the computer-executable instructions stored in the memory 502, so that at least one processor 501 executes the above method.

[0117] The specific implementation process of the processor 501 can be found in the above method embodiment, and its implementation principle and technical effect are similar, so this embodiment 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 (DSP), application-specific integrated circuits (ASIC), etc. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the invention can be directly implemented as a hardware processor, or can be implemented by a combination of hardware and software modules in the processor.

[0119] The memory may include a high-speed memory (Random Access Memory, RAM), and may also include a non-volatile memory (NVM), such as at least one disk storage.

[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. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of this application is not limited to only one bus or one type of bus.

[0121] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0122] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0123] The above-mentioned 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 memory, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general or special-purpose computer.

[0124] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium 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 be located in an application specific integrated circuit (Application Specific Integrated Circuits, referred to as: ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0125] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

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

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

[0128] If the function is implemented in the form of 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 the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0129] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0130] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for detoxifying hydrocarbons 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, obtaining a target parameter of a front-stage SCR catalyst in a post-treatment system of the vehicle after the last completion of hydrocarbon detoxification, wherein the target parameter includes at least one of the following: a cumulative hydrocarbon exposure amount, a cumulative active regeneration time, and a cumulative amount of hydrocarbons passed; 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 condition of the vehicle to control the engine to run at the maximum speed, and 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, and the heating device is located before the after-treatment system to perform hydrocarbon detoxification on the front-stage SCR catalyst.

2. The method according to claim 1, characterized in that: The process of determining the preset parameters includes: Testing the nitrogen oxygen conversion rate of the front-stage SCR catalyst during the process of gradually increasing the target parameter of the front-stage SCR catalyst; The target parameter when the nitrogen oxygen conversion rate drops 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 accumulated hydrocarbon exposure amount is less than the preset parameter, the aftertreatment system is controlled to operate in a normal mode.

4. The method according to claim 1, characterized in that: The process of determining the cumulative amount of carbon and hydrogen includes: Acquire at least one operating condition information of the engine of the vehicle between the end of the last hydrocarbon detoxification and the current time, the operating condition information including: speed and torque; Acquire hydrocarbon emission information corresponding to the operating condition information from preset calibration information, wherein the hydrocarbon emission information includes: emission concentration and exhaust flow rate; Calculating the product of the emission concentration and the exhaust flow rate corresponding to each of the operating condition information as the passing hydrocarbon amount of the operating condition information; The sum of the passing hydrocarbon amounts of at least one of the operating condition information is determined as the cumulative passing hydrocarbon amount.

5. The method according to claim 4, characterized in that The obtaining the hydrocarbon emission information corresponding to the operating condition information from the preset calibration information includes: Matching the operating condition information with the preset operating condition in the preset calibration information to obtain a matching degree; Acquire target hydrocarbon emission information of at least one preset operating condition whose matching degree is greater than or equal to a 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, and weighted averaging is performed on at least one of the target hydrocarbon emission information to obtain the hydrocarbon emission information corresponding to the operating condition information.

6. The method according to claim 1, characterized in that The heating device comprises a plurality of heating devices, and the heating device in the exhaust pipe of the vehicle is controlled to heat the exhaust gas, including: Determining a target heating device from the plurality of heating devices according to a temperature difference between the temperature of the exhaust gas and the preset temperature, and a power of the heating device, wherein the number of the target heating devices is positively correlated to the temperature difference and negatively correlated to the power; The target heating device is controlled to start heating.

7. A hydrocarbon detoxification device for a post-processing system, characterized in that: include: An acquisition module is used to determine whether the active regeneration of the vehicle at this stage has ended. If the active regeneration has ended, a target parameter of the front-stage SCR catalyst in the post-treatment system of the vehicle after the last completion of hydrocarbon detoxification is acquired, wherein the target parameter includes at least one of the following: cumulative hydrocarbon exposure, cumulative active regeneration time, and cumulative passing hydrocarbon amount; A processing module 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, wherein the heating device is located before the after-treatment system to perform hydrocarbon detoxification on the front-stage SCR catalyst.

8. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 6 when executed by a processor.

10. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 6 when being executed by a processor.

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