A crystallization removal method, device, electronic device and vehicle

Abstract

The application provides a crystallization removal method and device, electronic equipment and vehicle, and relates to the technical field of tail gas treatment. After each crystallization removal is completed, whether the difference between the current time and the completion time of the last crystallization removal is not less than the length of the current crystallization period is determined. If yes, the operating parameters of the engine are adjusted to increase the reaction temperature in the SCR mixer. With the increase of the temperature, whether the ammonia peak period appears within the preset time period after the reaction temperature reaches the crystallization removal temperature is determined. If yes, the engine is controlled to operate in the preset operating mode within the crystallization removal time period after the ammonia peak period, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature, the accumulation of urea crystallization is avoided, the engine is kept in a better state, and the use experience and service life of the vehicle are improved.

Description

Technical Field

[0001] This invention relates to the field of exhaust emission technology, and in particular to a method, apparatus, electronic device, and vehicle for crystal removal. Background Technology

[0002] With increasingly stringent emission requirements for diesel engines, controlling nitrogen oxide (NOx) emissions will face significant challenges. Besides in-engine purification measures, the most common and crucial method for reducing NOx emissions is the addition of SCR (Selective Catalytic Reduction) aftertreatment. This involves injecting a suitable amount of urea at a certain pressure into the SCR mixer through a urea injector. Through a series of physicochemical reactions, NOx is eliminated. However, due to factors such as exhaust temperature, exhaust flow rate, and urea injection quantity, urea crystallization can easily occur in the SCR mixer. Urea crystallization leads to excessive emissions, increased exhaust back pressure, and higher fuel consumption, negatively impacting vehicle performance and lifespan. Summary of the Invention

[0003] This invention provides a method, apparatus, electronic device, and vehicle for removing crystals, which can remove crystals in a timely and effective manner, keeping the engine and vehicle in better operating condition and ensuring service life.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A crystal removal method according to a specific embodiment of the present invention includes:

[0006] Determine whether the difference between the current time and the time when the most recent crystallization clearing was completed is not less than the duration of the current crystallization cycle;

[0007] If so, the engine operating parameters are adjusted to increase the reaction temperature in the SCR mixer;

[0008] Determine whether an ammonia peak occurs within a preset time period after the reaction temperature reaches the crystallization clearance temperature;

[0009] If so, the engine is controlled to operate in a preset operating mode during the crystallization removal time after the ammonia peak period, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature, and the crystallization removal time is the removal time corresponding to the characteristic value of the ammonia peak period.

[0010] Furthermore, the duration of the current crystallization cycle is obtained based on the temperature range to which the reaction temperature in the current SCR mixer belongs.

[0011] Furthermore, adjusting the engine's operating parameters to increase the reaction temperature in the SCR mixer includes:

[0012] Gradually reduce the intake air volume of the engine and increase the fuel injection volume of the engine to increase the exhaust temperature of the engine.

[0013] Furthermore, during the crystallization removal period following the ammonia peak, the engine is controlled to operate according to a preset operating mode, including:

[0014] The engine is controlled to operate at the minimum fuel injection quantity and corresponding air intake quantity to maintain the crystal removal temperature.

[0015] Further, determining whether an ammonia peak occurs within a preset time period after the reaction temperature reaches the crystallization clearance temperature includes:

[0016] Obtain the ammonia concentration value at each data acquisition moment within the preset time period;

[0017] If the difference between the two endpoints of the first target time interval and the corresponding adjacent data collection time outside the first target time interval is greater than the peak threshold, and the difference between each data collection time within the first target time interval is not greater than the first fluctuation value, then it is determined that an ammonia peak period has occurred.

[0018] Furthermore, the characteristic values ​​of the ammonia peak period include at least the average, minimum, and maximum values ​​determined based on the ammonia concentration values ​​corresponding to each data acquisition time within the first target time interval.

[0019] Furthermore, the crystal removal method further includes:

[0020] If the difference between the two endpoints of the second target time interval and the corresponding adjacent data acquisition time outside the second target time interval is less than the stop threshold, and the difference between each data acquisition time within the second target time interval is not greater than the second fluctuation value, then the engine will be switched to normal operation mode.

[0021] A crystal removal device according to a specific embodiment of the present invention includes:

[0022] The crystallization cycle judgment module is used to determine whether the difference between the current time and the time when the most recent crystallization clearing was completed is not less than the duration of the current crystallization cycle.

[0023] The operating parameter adjustment module is used to adjust the engine's operating parameters to increase the reaction temperature in the SCR mixer if necessary.

[0024] The ammonia peak determination module is used to determine whether an ammonia peak period occurs within a preset time after the reaction temperature reaches the crystallization clearance temperature; and

[0025] A crystallization removal module is used to control the engine to operate in a preset operating mode during the crystallization removal time after the ammonia peak period, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature, wherein the crystallization removal time is the removal time corresponding to the characteristic value of the ammonia peak period.

[0026] An electronic device according to a specific embodiment of the present invention includes: a memory and a processor;

[0027] The memory is used to store programs;

[0028] The processor is used to execute the program to implement the various steps of the crystal removal method as described above.

[0029] A vehicle according to a specific embodiment of the present invention includes: a vehicle body and an electronic device as described above disposed in the vehicle body.

[0030] As can be seen from the above technical solution, the present invention discloses a crystallization removal method. After each crystallization removal is completed, the difference between the current time and the completion time of the most recent crystallization removal is determined to be not less than the duration of the current crystallization cycle. If so, the engine operating parameters are adjusted to increase the reaction temperature in the SCR mixer. As the temperature increases, it is determined whether an ammonia peak occurs within a preset time after the reaction temperature reaches the crystallization removal temperature. If so, the engine is controlled to operate according to a preset operating mode during the crystallization removal time after the ammonia peak, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature, thereby completing the crystal removal within the crystallization removal time. This achieves dynamic adjustment of the crystallization removal time according to the crystallization cycle and dynamic crystal removal according to the crystallization situation, avoiding the accumulation of urea crystals, keeping the engine in optimal condition, and improving vehicle user experience and lifespan. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A flowchart of a crystal removal method provided in an embodiment of the present invention;

[0033] Figure 2 This is a graph showing the relationship between ammonia concentration and temperature provided in an embodiment of the present invention.

[0034] Figure 3 A schematic diagram of the working principle of an SCR provided in an embodiment of the present invention;

[0035] Figure 4 This is a structural diagram of the crystal removal device provided in an embodiment of the present invention;

[0036] Figure 5 This is a structural diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Reference Figure 3 The principle of NOx (nitrogen oxides) treatment in the SCR aftertreatment system is as follows: First, urea is hydrolyzed to obtain NH3. NH3 reacts with NOx to produce nitrogen and water, thus eliminating NOx. However, due to factors such as exhaust temperature, exhaust flow rate, and urea injection volume, urea crystallization can easily occur in the SCR mixer, leading to problems such as excessive emissions, increased exhaust back pressure, and higher fuel consumption.

[0039] Regarding the above crystallization problem, refer to Figure 1 As shown, this embodiment of the invention provides a crystal removal method, which may include the following steps:

[0040] 101. Determine whether the difference between the current time and the time when the most recent crystallization clearing was completed is not less than the duration of the current crystallization cycle.

[0041] Specifically, the duration of the current crystallization cycle can be determined based on the temperature range within the SCR mixer. The reaction temperature in the SCR mixer can be monitored by temperature sensors installed at the inlet or outlet. The reaction temperature varies depending on the vehicle's operating conditions, load, and road conditions. For example, when a vehicle is unloaded, the engine's power is lower, resulting in lower exhaust gas temperatures and consequently, lower reaction temperatures in the SCR mixer. Conversely, when the vehicle is fully loaded, the reaction temperature is higher. The duration of the current crystallization cycle can be determined based on the detected real-time temperature range within the SCR mixer.

[0042] If the SCR mixer temperature fluctuates between 200 and 250 degrees Celsius, the current crystallization cycle can be determined as 50 hours. If it fluctuates between 300 and 340 degrees Celsius, the current crystallization cycle can be determined as 120 hours. After the current engine running time exceeds the above-determined current crystallization cycle, it can be determined that the urea crystal removal stage has begun.

[0043] This allows for dynamic determination of the crystallization cycle, making the determination more accurate and enabling timely cleaning of crystals to avoid problems such as decreased engine performance caused by excessive crystal formation.

[0044] It is understood that the determination of the current crystallization cycle can be set according to different reaction temperature ranges, and those skilled in the art can adjust the determination of the current crystallization cycle as needed, without any restrictions.

[0045] 102. If so, adjust the engine operating parameters to increase the reaction temperature in the SCR mixer.

[0046] Specifically, as the engine runs, once the running time exceeds the current crystallization cycle, the subsequent crystallization and removal stage can begin. This is achieved by adjusting the engine's operating parameters to increase the temperature of the engine exhaust gas, thereby raising the reaction temperature in the SCR mixer. For example, the engine's exhaust temperature can be increased by gradually reducing the engine's intake air volume while increasing the engine's fuel injection volume.

[0047] It is understood that those skilled in the art can also use other known parameter adjustment methods to adjust the engine parameters in order to increase the exhaust gas temperature, which will not be elaborated here.

[0048] 103. Determine whether a peak ammonia gas period occurs within a preset time after the reaction temperature reaches the crystallization clearance temperature.

[0049] As the reaction temperature in the SCR mixer increases, after reaching a certain threshold temperature (generally 350 degrees Celsius), the urea crystals can be evaporated. A significant increase in ammonia concentration is detected by the corresponding nitrogen oxide sensor in the SCR mixer; that is, when a clearly abnormal ammonia peak is detected, it can be determined that there is a significant amount of crystallization in the current crystallization cycle that needs to be cleared. This ammonia peak occurs approximately several tens of seconds to one minute after the reaction temperature in the SCR mixer reaches the crystallization removal temperature. The preset waiting time for this ammonia peak can be set to approximately one minute. If the ammonia peak is detected within one minute after the reaction temperature reaches 350 degrees Celsius, the next crystallization removal step can proceed. If no ammonia peak is detected, it indicates that the crystallization has not yet been cleared, and the engine can be switched to normal operating mode.

[0050] It is understood that the above-mentioned preset duration and peak period duration can be adjusted according to different engine models, and there are no restrictions here.

[0051] 104. If so, the engine shall be controlled to operate in the preset operating mode during the crystallization removal time after the ammonia peak period, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature, and the crystallization removal time is the removal time corresponding to the characteristic value of the ammonia peak period.

[0052] Specifically, after the ammonia concentration peaks, the required crystal removal time can be determined based on the concentration within that peak range. This removal time can be determined according to characteristic values ​​of the concentration within that peak range, such as maximum, minimum, and average values, or it can be determined based on the concentration range. For example, if the concentration is in the range of 2600-3000, the corresponding crystal removal time can be set to 10 minutes. The engine is then switched to a preset operating mode to remove the crystals. This preset operating mode can be the engine operating parameters determined in step 102 above, or other parameters obtained from actual measurements; no restrictions are placed here.

[0053] As can be seen from the above, this crystal removal method can predict the crystallization cycle based on the SCR temperature performance during engine operation, and provide more accurate feedback and judgment on the actual crystallization situation by running the de-crystallization mode, thereby determining the corresponding crystal removal time. This makes crystal removal more flexible, enabling timely removal of crystals and effectively reducing the occurrence of problems such as excessive emissions, increased exhaust back pressure, and higher fuel consumption, thus improving user experience and engine lifespan.

[0054] To further reduce fuel consumption and exhaust emissions during the crystallization removal process, in another specific embodiment of the present invention, the engine is controlled to operate according to a preset operating mode during the crystallization removal period after the ammonia peak period, which may specifically include the following processing steps:

[0055] The engine is controlled to operate at the minimum fuel injection quantity and corresponding intake air volume required to maintain the crystal removal temperature. This means the engine operates in a relatively fuel-efficient mode that generates higher exhaust temperatures, achieving a balance between fuel efficiency and crystal removal.

[0056] As a possible implementation of step 103 above, in some specific embodiments of the present invention, determining whether an ammonia peak occurs within a preset time period after the reaction temperature reaches the crystallization clearance temperature may specifically include the following process:

[0057] 601. Obtain the ammonia concentration value at each data acquisition moment within a preset time period;

[0058] 602. If the difference between the two endpoints of the first target time interval and the corresponding adjacent data acquisition time outside the first target time interval is greater than the peak threshold, and the difference between each data acquisition time within the first target time interval is not greater than the first fluctuation value, then it is determined that an ammonia peak period has occurred.

[0059] Specifically, when collecting ammonia concentration data using sensors, concentration values ​​can be collected at regular intervals, such as every 10 milliseconds. By comparing the concentration value at each sequential collection point with the concentration value at the previous collection point, the points where the difference between two adjacent collection points suddenly increases or decreases can be identified, thus determining the period of ammonia peak. For example, refer to... Figure 2 As shown in the figure, after the reaction temperature in the upper part of the figure reaches above 350 degrees Celsius, the concentration change curve shown in the lower part shows a significant peak at 1320 milliseconds, and the peak disappears at 1340 milliseconds. This nearly 20-millisecond period can be identified as the peak period, indicating that crystal removal is required.

[0060] The corresponding characteristic values ​​for the peak ammonia period include at least the average, minimum, and maximum values ​​determined based on the ammonia concentration values ​​at each data acquisition time within the first target time interval.

[0061] To further optimize this technical solution and achieve the effect of saving fuel and reducing energy consumption, in some other specific embodiments of the invention, the ammonia concentration value during the crystallization removal stage can be monitored in real time. When it is determined that the concentration value is very low, but the previously determined crystallization removal time has not yet been reached, the engine can be switched to normal operation mode to further reduce energy consumption.

[0062] Specifically, the engine can be switched to normal operation mode if the difference between the two endpoints of the second target time interval and the corresponding adjacent data acquisition time outside the second target time interval is less than the stop threshold, and the difference between each data acquisition time within the second target time interval is not greater than the second fluctuation value.

[0063] That is, if there is a period of time in which the concentration value at each collection time is lower than the concentration value at which the crystallization removal mode is stopped, and the concentration value at each time of the period is almost unaffected, then it can be determined that the crystallization removal mode can be exited.

[0064] Reference Figure 4 As shown, embodiments of the present invention also provide a crystallization removal apparatus, which can perform the various steps of the above-described crystallization removal method during operation. The apparatus may include:

[0065] The crystallization cycle judgment module 401 is used to determine whether the difference between the current time and the time when the most recent crystallization clearing was completed is not less than the duration of the current crystallization cycle.

[0066] The operating parameter adjustment module 402 is used to adjust the engine's operating parameters to increase the reaction temperature in the SCR mixer if necessary.

[0067] The ammonia peak determination module 403 is used to determine whether an ammonia peak occurs within a preset time period after the reaction temperature reaches the crystallization removal temperature.

[0068] The crystallization removal module 404 is used to control the engine to operate in a preset operating mode during the crystallization removal time after the ammonia peak period if the condition is met, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature. The crystallization removal time is the removal time corresponding to the characteristic value of the ammonia peak period.

[0069] Furthermore, the crystallization cycle determination module 401 is specifically used to obtain the duration of the current crystallization cycle based on the temperature range to which the reaction temperature in the current SCR mixer belongs.

[0070] Furthermore, the operating parameter adjustment module 402 is specifically used for:

[0071] Gradually reduce the engine's intake air volume and increase the engine's fuel injection volume to increase the engine's exhaust temperature.

[0072] Furthermore, the crystal removal module 404 is also used for:

[0073] The engine is controlled to operate at the minimum fuel injection quantity and corresponding air intake quantity to maintain the crystal removal temperature.

[0074] Furthermore, the ammonia peak value determination module 403 is specifically used for:

[0075] Obtain the ammonia concentration value at each data acquisition moment within the preset time period;

[0076] If the difference between the two endpoints of the first target time interval and the corresponding adjacent data collection time outside the first target time interval is greater than the peak threshold, and the difference between each data collection time within the first target time interval is not greater than the first fluctuation value, then it is determined that an ammonia peak period has occurred.

[0077] Furthermore, the characteristic values ​​of the ammonia peak period include at least the average, minimum, and maximum values ​​determined based on the ammonia concentration values ​​corresponding to each data acquisition time within the first target time interval.

[0078] Furthermore, the ammonia peak value determination module 403 is also specifically used for:

[0079] If the difference between the two endpoints of the second target time interval and the corresponding adjacent data acquisition time outside the second target time interval is less than the stop threshold, and the difference between each data acquisition time within the second target time interval is not greater than the second fluctuation value, then the engine will be switched to normal operation mode.

[0080] Reference Figure 5 As shown, embodiments of the present invention also provide an electronic device, which may include: a memory 501 and a processor 502.

[0081] Memory 501 is used to store programs.

[0082] Processor 502 is used to execute the program to implement the various steps of the crystal removal method as described in the above embodiments.

[0083] Embodiments of the present invention also provide a vehicle, which may include: a vehicle body and electronic devices as described in the above embodiments disposed in the vehicle body.

[0084] For the foregoing method embodiments, in order to simplify the description, they are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0085] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0086] The steps in the methods of the various embodiments of the present invention can be adjusted, merged, or deleted in order according to actual needs, and the technical features described in the various embodiments can be replaced or combined.

[0087] The modules and sub-modules in the various embodiments of the present invention can be merged, divided, and deleted according to actual needs.

[0088] In the embodiments provided by this invention, it should be understood that the disclosed terminals, devices, and methods can be implemented in other ways. For example, the terminal embodiments described above are merely illustrative. For instance, the division of modules or sub-modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple sub-modules or modules may be combined or integrated into another module, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or modules, and may be electrical, mechanical, or other forms.

[0089] The modules or submodules described as separate components may or may not be physically separate. The components that constitute a module or submodule may or may not be physical modules or submodules; that is, they may be located in one place or distributed across multiple network modules or submodules. Some or all of the modules or submodules can be selected to achieve the purpose of this embodiment's solution, depending on actual needs.

[0090] Furthermore, the functional modules or sub-modules in the various embodiments of the present invention can be integrated into one processing module, or each module or sub-module can exist physically separately, or two or more modules or sub-modules can be integrated into one module. The integrated modules or sub-modules described above can be implemented in hardware or in the form of software functional modules or sub-modules.

[0091] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0092] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software unit executed by a processor, or a combination of both. The software unit can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0093] The electronic devices mentioned in this article can be servers, PCs, tablets, mobile phones, ECUs (Electronic Control Units), VCUs (Vehicle Control Units), MCUs (Micro Controller Units), HCUs (Hybrid Control Units), etc.

[0094] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0095] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for removing crystals, characterized in that, include: Determine whether the difference between the current time and the time when the most recent crystallization clearing was completed is not less than the duration of the current crystallization cycle; If so, the engine operating parameters are adjusted to increase the reaction temperature in the SCR mixer; Determining whether a peak ammonia gas period occurs within a preset time after the reaction temperature reaches the crystallization clearance temperature includes: Obtain the ammonia concentration value at each data acquisition moment within the preset time period; If the difference between the two endpoints of the first target time interval and the corresponding adjacent data collection time outside the first target time interval is greater than the peak threshold, and the difference between each data collection time within the first target time interval is not greater than the first fluctuation value, then it is determined that an ammonia peak period has occurred. If so, the engine is controlled to operate in a preset operating mode during the crystallization removal time after the ammonia peak period, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature, and the crystallization removal time is the removal time corresponding to the characteristic value of the ammonia peak period.

2. The crystal removal method according to claim 1, characterized in that, The duration of the current crystallization cycle is obtained based on the temperature range to which the reaction temperature in the current SCR mixer belongs.

3. The crystal removal method according to claim 1, characterized in that, The adjustment of engine operating parameters to increase the reaction temperature in the SCR mixer includes: Gradually reduce the intake air volume of the engine and increase the fuel injection volume of the engine to increase the exhaust temperature of the engine.

4. The crystal removal method according to claim 1 or 3, characterized in that, During the crystallization removal period following the ammonia peak, the engine is controlled to operate according to a preset operating mode, including: The engine is controlled to operate at the minimum fuel injection quantity and corresponding air intake quantity to maintain the crystal removal temperature.

5. The crystal removal method according to claim 1, characterized in that, The characteristic values ​​of the peak ammonia period include at least the average, minimum, and maximum values ​​determined based on the ammonia concentration values ​​at each data acquisition time within the first target time interval.

6. The crystal removal method according to claim 1, characterized in that, Also includes: If the difference between the two endpoints of the second target time interval and the corresponding adjacent data acquisition time outside the second target time interval is less than the stop threshold, and the difference between each data acquisition time within the second target time interval is not greater than the second fluctuation value, then the engine will be switched to normal operation mode.

7. A crystal removal device, characterized in that, include: The crystallization cycle judgment module is used to determine whether the difference between the current time and the time when the most recent crystallization clearing was completed is not less than the duration of the current crystallization cycle. The operating parameter adjustment module is used to adjust the engine's operating parameters to increase the reaction temperature in the SCR mixer if necessary. The ammonia peak determination module is used to determine whether an ammonia peak period occurs within a preset time after the reaction temperature reaches the crystallization clearance temperature, including: Obtain the ammonia concentration value at each data acquisition moment within the preset time period; If the differences between the two endpoints of the first target time interval and the corresponding adjacent data acquisition times outside the first target time interval are both greater than the peak threshold, and the differences between data acquisition times within the first target time interval are not greater than the first fluctuation value, then it is determined that an ammonia peak period has occurred; and The crystallization removal module is used to control the engine to operate in a preset operating mode during the crystallization removal time after the ammonia peak period, so that the reaction temperature in the SCR mixer is not lower than the crystallization removal temperature, wherein the crystallization removal time is the removal time corresponding to the characteristic value of the ammonia peak period.

8. An electronic device, characterized in that, include: Memory and processor; The memory is used to store programs; The processor is configured to execute the program to implement the various steps of the crystal removal method as described in any one of claims 1 to 6.

9. A vehicle, characterized in that, include: The vehicle body and the electronic device as described in claim 8 disposed in the vehicle body.

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