A method and system for preventing crystallization of urea nozzles

Abstract

The application provides a method and system for preventing urea nozzle crystallization, which belongs to the field of control and comprises the following steps: when a vehicle is started, heating a specified device installed at a nozzle of a urea nozzle of the vehicle for dissolving urea crystallization of the urea nozzle, the specified device being provided with a plurality of air holes; identifying a currently enabled operation mode of an engine of the vehicle; and according to a control strategy matched with the currently enabled operation mode of the engine, discharging high-pressure gas from the air holes of the specified device for cleaning urea residual liquid of the urea nozzle. The present scheme can avoid urea crystallization around the urea nozzle by heating the specified device installed at the nozzle of the urea nozzle to dissolve urea crystallization of the urea nozzle and discharging high-pressure gas from the air holes of the specified device to clean urea residual liquid of the urea nozzle.

Description

Technical Field

[0001] This invention relates to the field of control technology, and specifically to a method and system for preventing urea nozzle crystallization. Background Technology

[0002] Using urea is a primary measure to reduce nitrogen oxide (NOx) emissions, ensuring vehicles meet emission standards. However, in actual use, abnormal crystallization can occur in the urea nozzle. For example, atomized urea may fall near the nozzle and crystallize, affecting normal urea injection and causing abnormal emissions.

[0003] Therefore, there is an urgent need for a method to prevent urea nozzles from crystallizing. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a method and system for preventing urea nozzle crystallization.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] The first aspect of this invention discloses a method for preventing urea nozzle crystallization, the method comprising:

[0007] When the vehicle is started, a designated device is heated to dissolve urea crystals in the urea nozzle of the vehicle. The designated device is installed at the nozzle of the urea nozzle and is provided with multiple air holes.

[0008] Identify the currently active operating mode of the vehicle's engine;

[0009] According to a control strategy that matches the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean the urea residue in the urea nozzle, wherein the direction in which the high-pressure gas is discharged from the vent of the designated device is the same as the direction in which the urea is sprayed from the urea nozzle.

[0010] Preferably, the engine is currently operating in regenerative mode;

[0011] In accordance with a control strategy matching the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean residual urea from the urea nozzle, including:

[0012] Obtain the first purging frequency of the high-pressure gas;

[0013] According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the first purging frequency to clean the urea residue from the urea nozzle.

[0014] Preferably, the engine is currently operating in a parking mode;

[0015] In accordance with a control strategy matching the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean residual urea from the urea nozzle, including:

[0016] Obtain the second purging frequency of the high-pressure gas;

[0017] High-pressure gas is discharged from the vent of the designated device at the second purging frequency and for a preset duration to clean the urea residue in the urea nozzle.

[0018] Preferably, the engine is currently operating in a mode other than regeneration mode and shutdown mode;

[0019] In accordance with a control strategy matching the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean residual urea from the urea nozzle, including:

[0020] Obtain the third purging frequency of the high-pressure gas;

[0021] According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the third purging frequency to clean the urea residue from the urea nozzle.

[0022] Preferably, the designated device is a heating pad.

[0023] A second aspect of this invention discloses a system for preventing urea nozzle crystallization, the system comprising:

[0024] A heating unit is used to heat a designated device when the vehicle is started to dissolve urea crystals in the urea nozzle of the vehicle. The designated device is installed at the nozzle of the urea nozzle and is provided with multiple air holes.

[0025] The identification unit is used to identify the current operating mode of the vehicle's engine;

[0026] A purging unit is used to discharge high-pressure gas from the vent of the designated device to clean the urea residue from the urea nozzle according to a control strategy that matches the currently activated operating mode of the engine, wherein the direction in which the high-pressure gas is discharged from the vent of the designated device is the same as the direction in which the urea is sprayed from the urea nozzle.

[0027] Preferably, the engine is currently operating in regeneration mode, and the purging unit is specifically used for:

[0028] Obtain the first purging frequency of the high-pressure gas;

[0029] According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the first purging frequency to clean the urea residue from the urea nozzle.

[0030] Preferably, the engine is currently operating in a shutdown mode, and the purging unit is specifically used for:

[0031] Obtain the second purging frequency of the high-pressure gas;

[0032] High-pressure gas is discharged from the vent of the designated device at the second purging frequency and for a preset duration to clean the urea residue in the urea nozzle.

[0033] Preferably, the engine is currently operating in a mode other than regeneration mode and shutdown mode, and the purging unit is specifically used for:

[0034] Obtain the third purging frequency of the high-pressure gas;

[0035] According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the third purging frequency to clean the urea residue from the urea nozzle.

[0036] Preferably, the designated device is a heating pad.

[0037] Based on the above embodiments of the present invention, a method and system for preventing urea nozzle crystallization are provided. The method involves: when the vehicle is started, heating a designated device to dissolve urea crystals in the vehicle's urea nozzle; the designated device being installed at the nozzle of the urea nozzle and having multiple vents; identifying the currently activated operating mode of the vehicle's engine; and, according to a control strategy matching the currently activated engine operating mode, discharging high-pressure gas from the vents of the designated device to clean residual urea liquid from the urea nozzle. This solution dissolves urea crystals in the urea nozzle by heating the designated device installed at the nozzle of the urea nozzle and cleans residual urea liquid from the urea nozzle by discharging high-pressure gas from the vents of the designated device, thereby preventing urea crystallization around the urea nozzle. Attached Figure Description

[0038] 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0039] Figure 1 A structural example diagram of a conventional urea injection system provided for an embodiment of the present invention;

[0040] Figure 2 A flowchart illustrating a method for preventing urea nozzle crystallization, provided in an embodiment of the present invention;

[0041] Figure 3 Example diagrams of a designated device provided in embodiments of the present invention;

[0042] Figure 4 This is an example diagram of the control logic for a method to prevent urea nozzle crystallization, provided in an embodiment of the present invention.

[0043] Figure 5 This is a structural block diagram of a system for preventing urea nozzle crystallization, provided as an embodiment of the present invention. Detailed Implementation

[0044] 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.

[0045] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a 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 limitation, 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.

[0046] Before explaining this plan, let's first clarify some of the terms used in the following content:

[0047] Selective Catalytic Reduction (SCR): SCR is a process for treating nitrogen oxides (NOx) in diesel vehicle exhaust.

[0048] Urea crystals (usually automotive urea crystals): These are various byproducts resulting from urea evaporation and precipitation due to system problems or poor system reaction during the operation of a vehicle's SCR system.

[0049] Using urea is a primary measure to reduce nitrogen oxide (NOx) emissions, ensuring vehicles meet emission standards. However, in actual use, urea injection nozzles can become abnormally crystallized, affecting normal injection and causing abnormal emissions, thus impacting the user's ability to use the vehicle normally.

[0050] Research has found that when urea nozzles are operating normally, highly atomized urea particles are prone to residue on the catalytic converter wall and accumulate over time. With continuous operation under high injection volume conditions, low temperature operation will also exacerbate the accumulation of atomized urea, eventually leading to urea crystallization at the urea nozzle, which in turn affects normal urea injection. Abnormal urea injection will also affect the normal use of the vehicle.

[0051] Regarding the problem of "urea accumulation and crystallization caused by atomized urea falling near the urea nozzle", this solution proposes a method and system to prevent urea nozzle crystallization. The method involves dissolving urea crystals in the urea nozzle by heating a designated device installed at the nozzle of the urea nozzle, and cleaning residual urea liquid in the urea nozzle by venting high-pressure gas from the vent of the designated device, thereby preventing urea crystallization around the urea nozzle.

[0052] It should be noted that this solution is designed to prevent crystallization in the urea nozzles of a vehicle's urea injection system. Before explaining this solution, a conventional urea injection system will be explained first.

[0053] See Figure 1 The diagram shows a structural example of a conventional urea injection system provided by an embodiment of the present invention. The urea injection system includes at least a urea nozzle 101, an SCR assembly 102, a urea pressure pipe 103, and an integrated urea tank assembly 104. The urea nozzle 101 is installed at the "urea nozzle mounting port 105".

[0054] See Figure 2 The diagram shows a flowchart of a method for preventing urea nozzle crystallization according to an embodiment of the present invention, the method comprising:

[0055] Step S201: When the vehicle is started, a designated device is heated to dissolve urea crystals in the vehicle's urea nozzle.

[0056] It should be noted that the designator is installed at the nozzle of the urea nozzle, and the designator is provided with multiple air holes (for example, four air holes are symmetrically arranged).

[0057] Specifically, the designated device is installed at the urea nozzle and SCR assembly mounting location. This designated device is combined with the gasket of the urea nozzle, thus enabling the designated device to be installed on the periphery of the urea nozzle.

[0058] High-pressure gas, pressurized by the vehicle's air compressor, is discharged (or blown out) through the vent of the designated device, and the designated device is heated by the vehicle's heat source, thereby preventing and eliminating urea crystals.

[0059] In some specific embodiments, the designated device is a heating pad, such as... Figure 3 As can be seen from the example diagram of the designated device, the designated device is a heating pad 301, which has four symmetrically arranged air holes 302 (the number can be set according to the actual situation, and the four air holes are only for illustrative purposes). The heating pad 301 is combined with the pad of the urea nozzle to be installed on the periphery of the urea nozzle.

[0060] High-pressure gas, pressurized by the vehicle's air compressor 303, is blown out through the four air holes 302 of the heating pad 301, and the vehicle's heat source 304 heats the heating pad 301.

[0061] In the specific implementation step S201, when the vehicle is started, the designated device (such as a heating pad) is heated by the vehicle's heat source, and the urea crystals in the urea nozzle are dissolved by the heated designated device.

[0062] It should be noted that since the designated device is combined with the gasket of the urea nozzle and installed on the periphery of the nozzle, heating the designated device will thermally dissolve the urea crystal block focused on the periphery of the urea nozzle. That is, after abnormal urea crystals appear in the urea nozzle, the thermal dissolution of the urea crystal block can be completed by heating the designated device.

[0063] Step S202: Identify the currently enabled operating mode of the vehicle's engine.

[0064] In the specific implementation step S202, the current operating mode of the vehicle's engine is identified, which is regeneration mode, parking mode, or other modes.

[0065] Step S203: In accordance with a control strategy that matches the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of a designated device to clean the urea residue in the urea nozzle.

[0066] It should be noted that the high-pressure gas is discharged from the vent of the designated device in the same direction as the urea is injected from the urea nozzle, so as to avoid affecting the airflow.

[0067] High-pressure gas is discharged from the vent of the designated device, thereby causing the high-pressure gas to purge the periphery of the urea nozzle.

[0068] In the specific implementation of step S203, according to the control strategy that matches the current operating mode of the engine, the vehicle's air compressor is used to discharge high-pressure gas from the air hole of a designated device to clean the urea residue in the urea nozzle. The process of "discharging high-pressure gas from the air hole of the designated device" is called high-pressure purging. The air compressor is used to process the air under high pressure to obtain high-pressure gas.

[0069] The control strategies for exhausting high-pressure gas vary depending on the current operating mode of the engine. The following sections will provide a detailed explanation of the control strategies for exhausting high-pressure gas in different operating modes.

[0070] (i) The engine is currently operating in regeneration mode. The high-pressure gas is discharged from the vent of the designated device by obtaining the first purging frequency of the high-pressure gas (e.g., 600 Hz).

[0071] According to the interval frequency of urea injection from the urea nozzle, when the urea nozzle is not injecting urea, high-pressure gas is discharged from the air hole of the designated device at a first purging frequency to clean the urea residue from the urea nozzle.

[0072] In other words, if the engine is currently operating in regeneration mode, the first purging frequency of the high-pressure gas and the interval frequency of urea injection from the urea nozzle are obtained. The interval frequency of urea injection from the urea nozzle can be used to determine when the urea nozzle has an injection action (the action of injecting urea) and when it does not have an injection action.

[0073] The system determines whether the urea nozzle is spraying urea based on the interval frequency of urea spraying. If the urea nozzle is spraying urea (i.e., it is spraying urea), the high-pressure gas is not discharged (i.e., high-pressure purging is not performed).

[0074] If the urea nozzle does not spray, high-pressure gas is discharged from the air hole of the designated device at the first purging frequency, and the high pressure of the high-pressure gas is used to clean the urea residue in the urea nozzle.

[0075] By employing the above method, the high-pressure purging and urea injection from the urea nozzle operate at different times, thus avoiding disruption of the urea atomization effect.

[0076] (ii) The current operating mode of the engine is the shutdown mode. The high-pressure gas is discharged from the air hole of the designated device by: obtaining the second purging frequency of the high-pressure gas (e.g., 10 Hz); discharging the high-pressure gas from the air hole of the designated device at the second purging frequency for a preset duration (e.g., for 2 minutes) to clean the urea residue in the urea nozzle.

[0077] In other words, if the engine is currently in the off mode, high-pressure gas will be discharged from the vent of the designated device at the second purging frequency and will continue to purge at high pressure for a preset duration, thereby cleaning the urea residue in the urea nozzle.

[0078] (III) The engine is currently operating in a mode other than regeneration mode and shutdown mode. The high-pressure gas is discharged from the vent of the designated device in the following manner: the third purging frequency of the high-pressure gas is obtained (e.g., 60 Hz); according to the interval frequency of urea injection from the urea nozzle, when the urea nozzle is not injecting urea, the high-pressure gas is discharged from the vent of the designated device at the third purging frequency to clean the urea residue from the urea nozzle.

[0079] It should be noted that the first to third purging frequencies mentioned above can be set according to the actual situation, and no specific limits are made to these purging frequencies here.

[0080] In this embodiment of the invention, urea crystals in the urea nozzle are dissolved by heating a designated device installed at the nozzle of the urea nozzle, and residual urea liquid in the urea nozzle is cleaned by venting high-pressure gas from the vent of the designated device, thereby preventing urea crystals from forming around the urea nozzle.

[0081] To better understand the above embodiments of the present invention Figure 2 The content, taking the designated device as the heating pad as an example, is as follows: Figure 4 An example diagram illustrating the control logic of a method for preventing urea nozzle crystallization is provided below.

[0082] like Figure 4 As can be seen, when the vehicle starts, the vehicle's heat source is used to heat the heating pads, and then the current operating mode of the engine is determined.

[0083] (1) When the engine is currently in operation mode other than non-regeneration mode and non-stop mode, the third purging frequency of high pressure gas is 60HZ, and the interval frequency of urea injection by urea nozzle is obtained; when the urea nozzle has injection action, high pressure purging is not performed (i.e., high pressure gas does not move); when the urea nozzle does not have injection action, high pressure purging is performed (i.e., high pressure gas is discharged from the air hole of the heating pad at 60HZ).

[0084] (2) When the engine is currently in regeneration mode, the first purging frequency of the high-pressure gas is 600 Hz, and the interval frequency of urea injection from the urea nozzle is also obtained. When the urea nozzle is injecting, high-pressure purging is not performed (i.e., the high-pressure gas is not in motion). When the urea nozzle is not injecting, high-pressure purging is performed (i.e., the high-pressure gas is discharged from the air hole of the heating pad at 600 Hz).

[0085] (3) When the engine is currently in the parking mode, the second purging frequency of the high-pressure gas is 10 Hz, and the high-pressure purging is performed for 2 minutes (preset duration), that is, the high-pressure gas is discharged from the air hole of the heating pad at 10 Hz for 2 minutes.

[0086] In summary, this solution consists of two parts: heat source heating and high-pressure purging. Between urea injection intervals, an air compressor is used to process the air at high pressure. The high-pressure gas is discharged from the air vent of a designated device at a purging frequency (any one of the first to third purging frequencies). The high pressure of the gas is used to clean the residual urea liquid in the urea nozzle. When abnormal urea crystals appear in the urea nozzle, the abnormal urea crystals are thermally dissolved by the designated heating device. Combined with the purging of the high-pressure gas, the urea crystals in the urea nozzle can be removed.

[0087] In other words, this solution utilizes a designated device installed around the urea nozzle to perform high-pressure purging at a fixed frequency, reducing the residue and accumulation of urea solution in the urea nozzle and fundamentally preventing urea crystallization at the urea nozzle. Specifically, the high-pressure purging and urea injection processes can be time-avoided by adjusting the interval frequency of urea injection, i.e., a high-pressure purging is completed between two urea injections. The entire process cleans the urea at the urea nozzle without affecting the mixing of urea injection and air, preventing urea accumulation and the formation of a large amount of urea crystals that would affect normal urea injection. In special cases where urea crystals form in the urea nozzle, the urea crystals can be thermally dissolved using a heated designated device, combined with high-pressure purging to complete the removal of urea crystals.

[0088] Corresponding to the method for preventing urea nozzle crystallization provided in the above embodiments of the present invention, see also... Figure 5 The present invention also provides a structural block diagram of a system for preventing urea nozzle crystallization, the system including: a heating unit 501, an identification unit 502 and a purging unit 503;

[0089] Heating unit 501 is used to heat a designated device when the vehicle is started to dissolve urea crystals in the urea nozzle of the vehicle. The designated device is installed at the nozzle of the urea nozzle and has multiple air holes.

[0090] In some embodiments, the designated device is a heating pad.

[0091] The identification unit 502 is used to identify the current operating mode of the vehicle's engine.

[0092] The purging unit 503 is used to discharge high-pressure gas from the vent of a designated device to clean the urea residue in the urea nozzle according to a control strategy that matches the currently activated operating mode of the engine, wherein the direction in which the high-pressure gas is discharged from the vent of the designated device is the same as the direction in which the urea is sprayed from the urea nozzle.

[0093] In some embodiments, the engine is currently operating in regeneration mode, and the purging unit 503 is specifically used to: obtain a first purging frequency of high-pressure gas; and discharge high-pressure gas from the air hole of a designated device at the first purging frequency when the urea nozzle is not spraying urea, according to the interval frequency of urea injection from the urea nozzle, in order to clean the urea residue in the urea nozzle.

[0094] In other embodiments, the engine is currently operating in a parking mode, and the purging unit 503 is specifically used to: obtain a second purging frequency of high-pressure gas; discharge high-pressure gas from the air vent of a designated device at the second purging frequency for a preset duration, in order to clean the urea residue in the urea nozzle.

[0095] In some other embodiments, the engine is currently operating in a mode other than regeneration mode and shutdown mode. The purging unit 503 is specifically used to: obtain the third purging frequency of the high-pressure gas; and discharge the high-pressure gas from the air hole of the designated device at the third purging frequency when the urea nozzle is not spraying urea, according to the interval frequency of urea injection from the urea nozzle, in order to clean the urea residue from the urea nozzle.

[0096] In summary, the embodiments of the present invention provide a method and system for preventing urea nozzle crystallization. The method involves dissolving urea crystals in the urea nozzle by heating a designated device installed at the nozzle of the urea nozzle, and cleaning residual urea liquid in the urea nozzle by discharging high-pressure gas from the vent of the designated device, thereby preventing urea crystallization around the urea nozzle.

[0097] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, for system or system embodiments, since they are fundamentally similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. Components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0098] 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.

[0099] 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 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 preventing urea nozzle crystallization, characterized in that, The method includes: When the vehicle is started, a designated device is heated to dissolve urea crystals in the urea nozzle of the vehicle. The designated device is installed on the periphery of the urea nozzle and is provided with multiple air holes. Identify the currently active operating mode of the vehicle's engine; According to the control strategy matching the current operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean the urea residue in the urea nozzle. The direction of the high-pressure gas discharged from the vent of the designated device is the same as the direction of urea injection from the urea nozzle. After abnormal urea crystals appear in the urea nozzle, the abnormal urea crystals are thermally dissolved by the heated designated device. Combined with the purging of high-pressure gas, the urea crystals in the urea nozzle can be removed.

2. The method according to claim 1, characterized in that, The engine is currently operating in regeneration mode; In accordance with a control strategy matching the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean residual urea from the urea nozzle, including: Obtain the first purging frequency of the high-pressure gas; According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the first purging frequency to clean the urea residue from the urea nozzle.

3. The method according to claim 1, characterized in that, The engine is currently operating in the shutdown mode. In accordance with a control strategy matching the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean residual urea from the urea nozzle, including: Obtain the second purging frequency of the high-pressure gas; High-pressure gas is discharged from the vent of the designated device at the second purging frequency and for a preset duration to clean the urea residue in the urea nozzle.

4. The method according to claim 1, characterized in that, The engine is currently operating in a mode other than regeneration mode and shutdown mode. In accordance with a control strategy matching the currently activated operating mode of the engine, high-pressure gas is discharged from the vent of the designated device to clean residual urea from the urea nozzle, including: Obtain the third purging frequency of the high-pressure gas; According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the third purging frequency to clean the urea residue from the urea nozzle.

5. The method according to any one of claims 1-4, characterized in that, The designated device is a heating pad.

6. A system for preventing urea nozzle crystallization, characterized in that, The system includes: A heating unit is used to heat a designated device when the vehicle is started to dissolve urea crystals in the urea nozzle of the vehicle. The designated device is installed on the periphery of the urea nozzle and is provided with multiple air holes. The identification unit is used to identify the current operating mode of the vehicle's engine; The purging unit is used to discharge high-pressure gas from the vent of the designated device according to a control strategy that matches the current operating mode of the engine, in order to clean the urea residue in the urea nozzle. The direction in which the high-pressure gas is discharged from the vent of the designated device is the same as the direction in which the urea is sprayed from the urea nozzle. When abnormal urea crystals appear in the urea nozzle, the abnormal urea crystals are thermally dissolved by the heated designated device. Combined with the purging of the high-pressure gas, the urea crystals in the urea nozzle can be removed.

7. The system according to claim 6, characterized in that, The engine is currently operating in regeneration mode, and the purging unit is specifically used for: Obtain the first purging frequency of the high-pressure gas; According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the first purging frequency to clean the urea residue from the urea nozzle.

8. The system according to claim 6, characterized in that, The engine is currently operating in a shutdown mode, and the purging unit is specifically used for: Obtain the second purging frequency of the high-pressure gas; High-pressure gas is discharged from the vent of the designated device at the second purging frequency and for a preset duration to clean the urea residue in the urea nozzle.

9. The system according to claim 6, characterized in that, The engine is currently operating in a mode other than regeneration mode and shutdown mode, and the purging unit is specifically used for: Obtain the third purging frequency of the high-pressure gas; According to the interval frequency at which urea is sprayed from the urea nozzle, when the urea nozzle is not spraying, high-pressure gas is discharged from the air hole of the designated device at the third purging frequency to clean the urea residue from the urea nozzle.

10. The system according to any one of claims 6-9, characterized in that, The designated device is a heating pad.

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