Urea injection control method and device, electronic equipment, medium and computer product

Abstract

The invention relates to the technical field of engine aftertreatment, in particular to a urea injection control method and device, electronic equipment, a medium and a computer product, and the method comprises the steps that the concentration value of nitric oxide at an inlet of each urea nozzle at the current moment is obtained; according to the concentration value of the nitric oxide, the spraying duration of the corresponding urea nozzle is calculated; and determining a target spraying strategy of each urea nozzle according to the spraying duration of each urea nozzle, the driving number of the urea nozzles and the target control period, and controlling the urea nozzles to execute and complete the urea spraying action in the target control period according to the target spraying strategy. Therefore, the problem that urea injection is unstable in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of engine aftertreatment, and in particular to a urea injection control method, device, electronic equipment, medium and computer product. Background Art

[0002] With the increasing awareness of environmental protection and the increasingly stringent emission standards of various countries, the requirements for diesel engine exhaust treatment technology are also constantly increasing. As an important exhaust after-treatment technology, SCR (Selective Catalytic Reduction) technology is widely used in heavy-duty diesel vehicles and non-road mobile machinery to reduce nitrogen oxide (NOx) emissions. In the SCR system, urea solution is sprayed into the high-temperature exhaust gas and reacts with NOx under the action of the catalyst to produce harmless nitrogen and water.

[0003] The SCR system usually installs one or more urea injection devices at a certain position in the exhaust pipe, and the urea solution is pressurized and transported to the nozzle by the urea pump, and then the nozzle atomizes and sprays it into the exhaust flow. However, the related technology usually adopts a one-pump-two-nozzle method for urea injection, that is, a urea pump builds pressure to control the opening and closing of two nozzles to achieve two-stage injection. However, in the current control method, urea injection is all done at the same time. When the operating state suddenly changes, the urea injection amount will change dramatically, the pressure fluctuates greatly, and the urea injection amount cannot be accurately controlled, thus affecting the injection effect. Summary of the invention

[0004] The present application provides a urea injection control method, device, electronic equipment, medium and computer product to solve the problem of unstable urea injection in the related art.

[0005] The first aspect of the present application provides a urea injection control method, device, electronic device, medium and computer product, comprising the following steps: obtaining the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; calculating the injection duration of the corresponding urea nozzle according to the nitrogen oxide concentration value; determining a target injection strategy for each urea nozzle according to the injection duration of each urea nozzle, the number of urea nozzle drives and the target control period, and controlling all urea nozzles to perform the urea injection action within the target control period according to the target injection strategy.

[0006] Optionally, a target injection strategy for each urea nozzle is determined according to the injection duration of each urea nozzle, the number of urea nozzles and the target control cycle, including: if the number of driven urea nozzles is one, the injection strategy is a single injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is less than the target control cycle, the injection strategy is an alternating injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is greater than the target control cycle, the injection strategy is an alternating synchronous strategy.

[0007] Optionally, the single injection strategy is: within the target control cycle, controlling the urea nozzle to inject at a preset time point within the target control cycle; the alternating injection strategy is: controlling multiple urea nozzles to perform alternating injection within the target control cycle; the alternating synchronization strategy is: combining the injection time of each urea nozzle to determine the target injection mode, and after the first urea nozzle in the target injection mode stops injecting, controlling the driving nozzles outside the target injection mode to start injecting.

[0008] Optionally, before controlling all urea nozzles to perform the urea injection action within the target control period according to the target injection strategy, the method further includes: calculating the target urea injection amount of all urea nozzles at the current moment according to the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; and determining the injection pressure value of the urea pump at the current moment according to the target urea injection amount.

[0009] Optionally, determining the injection pressure value of the urea pump at the current moment according to the target urea injection amount includes: calculating the difference between the urea injection amounts of all urea nozzles at the current moment and the previous moment; determining the pressure correction coefficient of the urea pump according to the difference in urea injection amount; and determining the injection pressure value of the urea pump according to the pressure correction coefficient.

[0010] Optionally, if the difference in the urea injection amount is a positive value, it indicates that the pressure value of the urea pump increases, and if the difference in the urea injection amount is a negative value, it indicates that the pressure value of the urea pump decreases.

[0011] A second aspect of the present application provides a urea injection control device, including: an acquisition module, used to acquire the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; a calculation module, used to calculate the injection duration of the corresponding urea nozzle according to the nitrogen oxide concentration value; a control module, used to determine a target injection strategy for each urea nozzle according to the injection duration of each urea nozzle, the number of urea nozzle drives and the target control period, and control all urea nozzles according to the target injection strategy to complete the urea injection action within the target control period.

[0012] Optionally, the control module is further configured to: if the number of driven urea nozzles is one, the injection strategy is a single injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is less than the target control cycle, the injection strategy is an alternating injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is greater than the target control cycle, the injection strategy is an alternating synchronous strategy.

[0013] Optionally, the single injection strategy is: within the target control cycle, controlling the urea nozzle to inject at a preset time point within the target control cycle; the alternating injection strategy is: controlling multiple urea nozzles to perform alternating injection within the target control cycle; the alternating synchronization strategy is: combining the injection time of each urea nozzle to determine the target injection mode, and after the first urea nozzle in the target injection mode stops injecting, controlling the driving nozzles outside the target injection mode to start injecting.

[0014] Optionally, the urea injection control device further includes: a determination module, which is used to calculate the target urea injection amount of all urea nozzles at the current moment according to the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment before controlling all urea nozzles to perform the urea injection action within the target control period according to the target injection strategy; and determine the injection pressure value of the urea pump at the current moment according to the target urea injection amount.

[0015] Optionally, the determination module is further used to calculate the difference between the urea injection amounts of all urea nozzles at the current moment and the previous moment; determine the pressure correction coefficient of the urea pump according to the difference in urea injection amount; and determine the injection pressure value of the urea pump according to the pressure correction coefficient.

[0016] Optionally, if the difference in the urea injection amount is a positive value, it indicates that the pressure value of the urea pump increases, and if the difference in the urea injection amount is a negative value, it indicates that the pressure value of the urea pump decreases.

[0017] A third aspect of the present application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a urea injection control method as described in the above embodiment.

[0018] A fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement a urea injection control method as described in the above embodiment.

[0019] A fifth aspect of the present application provides a computer program product, including: a computer program or instructions, which, when executed, are used to implement the urea injection control method as described in the above embodiment.

[0020] Therefore, this application has at least the following beneficial effects:

[0021] The embodiment of the present application obtains the nitrogen oxide concentration value at the inlet of each urea nozzle and calculates the appropriate urea injection duration, so as to more accurately control the urea injection amount. A reasonable injection strategy is formulated according to the injection duration, the number of nozzles and the control cycle, which can effectively reduce the pressure fluctuations generated during the injection process and realize accurate control of urea injection. Thus, the problem of unstable urea injection in the related art is solved.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 A flowchart of a urea injection control method provided according to an embodiment of the present application;

[0025] Figure 2 This is an example diagram of a urea injection strategy provided according to an embodiment of the present application;

[0026] Figure 3 This is an example diagram of injection pressure provided according to one embodiment of the present application;

[0027] Figure 4 is a block diagram of a urea injection control device according to an embodiment of the present application;

[0028] Figure 5 Schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] The following describes the urea injection control method, device, vehicle and storage medium of the embodiment of the present application with reference to the accompanying drawings. In view of the problems mentioned in the above background technology, the present application provides a urea injection control method, in which the urea injection amount can be more accurately controlled by obtaining the nitrogen oxide concentration value at the inlet of each urea nozzle and calculating the appropriate urea injection duration. A reasonable injection strategy is formulated according to the injection duration, the number of nozzles and the control cycle, which can effectively reduce the pressure fluctuations generated during the injection process and achieve accurate control of urea injection. As a result, the problem of unstable urea injection in the related art is solved.

[0031] Specifically, Figure 1 A schematic flow chart of a urea injection control method provided in an embodiment of the present application.

[0032] like Figure 1 As shown, the urea injection control method includes the following steps:

[0033] In step S101, the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment is obtained.

[0034] In the embodiment of the present application, there may be multiple urea nozzles, and multiple PWM drives may be supported. Multiple nitrogen oxide sensors may also be provided to more accurately determine the nitrogen oxide concentration value in the exhaust gas.

[0035] In step S102, the injection duration of the corresponding urea nozzle is calculated according to the nitrogen oxide concentration value.

[0036] It is understandable that the embodiment of the present application can calculate the amount of urea to be injected based on the measured NOx concentration and the operating state of the engine (such as power, speed, etc.), and then determine the amount of urea injected each time, the injection frequency, and the injection duration. The calculation formula for the urea injection amount can be: 尿素 =NSR*C Nox *m EG .

[0037] Among them, M 尿素 is the urea injection amount, NSR is the ammonia nitrogen ratio, C NOx is the inlet NOx concentration, m EG is the exhaust mass flow rate.

[0038] Furthermore, in order to obtain a specific injection duration, the embodiment of the present application also determines the injection duration according to the required total urea amount and injection frequency and the temperature data collected by the temperature sensor.

[0039] In step S103, a target injection strategy for each urea nozzle is determined according to the injection duration of each urea nozzle, the number of driven urea nozzles and the target control period, and all urea nozzles are controlled according to the target injection strategy to complete the urea injection action within the target control period.

[0040] It is understandable that the embodiments of the present application can formulate injection strategies in combination with various conditions to avoid pressure fluctuations caused by simultaneous injection of multiple nozzles, and when actually allocating injection time slots, ensure that each nozzle has enough opportunities to complete the injection task within the target control cycle.

[0041] In one embodiment of the present application, a target injection strategy for each urea nozzle is determined according to the injection duration of each urea nozzle, the number of urea nozzles and the target control period, including: if the number of driven urea nozzles is one, the injection strategy is a single injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is less than the target control period, the injection strategy is an alternating injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is greater than the target control period, the injection strategy is an alternating synchronous strategy.

[0042] Among them, the single injection strategy is: within the target control cycle, the urea nozzle is controlled to inject at a preset time point within the target control cycle; the alternating injection strategy is: multiple urea nozzles are controlled to perform alternating injection within the target control cycle; the alternating synchronization strategy is: the injection time of each urea nozzle is combined to determine the target injection mode, and after the first urea nozzle in the target injection mode stops injecting, the urea nozzles outside the target injection mode are controlled to start injecting.

[0043] Specifically, the embodiment of the present application can determine the injection strategy according to the number of urea nozzles and the total injection time, such as Figure 2As shown in the case of single-nozzle injection, in the embodiments of the present application, injection can be carried out at a preset time point within the target control period. Among them, the preset time point can be the midpoint of the entire target control period, or can be set according to the actual situation without specific limitation. When multiple-nozzle injection is performed, each injection time state is relatively short, and the total injection time is less than one control period, that is, T>t1+t2+t3. In this case, it is necessary to reasonably allocate the injection time to ensure that one nozzle is closed and then another nozzle is opened for injection. When multiple-nozzle injection is performed, each injection time state is relatively long, and the total injection time is greater than one control period, that is, T<t1+t2+t3. In this case, the injection states overlap. In the embodiments of the present application, it is necessary to reasonably allocate the operating times of nozzle 1, nozzle 2, nozzle 3... First, combine all the injection times to find the injection mode in which the sum of the total injection times is closest to the execution period without overlapping injections. Then, the remaining nozzles will start injecting after the first injection time stops, which can effectively manage and control the urea injection system to ensure ideal injection effects under different working conditions while minimizing the system pressure fluctuations caused by injection.

[0044] In an embodiment of the present application, before controlling all urea nozzles to complete the urea injection action within the target control period according to the target injection strategy, it further includes: calculating the target urea injection amount of all urea nozzles at the current moment according to the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; determining the injection pressure value of the urea pump at the current moment according to the target urea injection amount.

[0045] In the embodiments of the present application, the calculation method of the target urea injection amount can refer to the above embodiments. To avoid redundancy, it will not be elaborated here.

[0046] Further, determining the injection pressure value of the urea pump at the current moment according to the target urea injection amount includes: calculating the difference between the urea injection amounts of all urea nozzles at the current moment and the previous moment; determining the pressure correction coefficient of the urea pump according to the difference in urea injection amounts; determining the injection pressure value of the urea pump according to the pressure correction coefficient.

[0047] Among them, if the difference in urea injection amount is positive, it means that the pressure value of the urea pump increases; if the difference in urea injection amount is negative, it means that the pressure value of the urea pump decreases.

[0048] Specifically, in the actual operating conditions, the NOx value at the inlet will change with the change of the working conditions, resulting in different situations of urea injection amounts. Such as Figure 3As shown, the urea injection amount calculated by the sensor is compared with the urea injection amount at the previous moment. When the target urea injection amount decreases, the target pressure value is reduced by 0.1 bar in advance, and when the target urea injection amount increases, the target pressure value is increased by 0.1 bar in advance to ensure that the urea injection will not be affected by the urea injection at the previous moment. In this way, the pressure of the urea pump can be dynamically adjusted to adapt to different injection requirements, thereby achieving more accurate urea injection control.

[0049] According to the urea injection control method proposed in the embodiment of the present application, by obtaining the nitrogen oxide concentration value at the inlet of each urea nozzle and calculating the appropriate urea injection duration, the urea injection amount can be controlled more accurately, and a reasonable injection strategy can be formulated according to the injection duration, the number of nozzles and the control cycle, which can effectively reduce the pressure fluctuations generated during the injection process and realize accurate control of urea injection. Thus, the problem of unstable urea injection in the related art is solved.

[0050] Next, the urea injection control device proposed according to the embodiment of the present application is described with reference to the accompanying drawings.

[0051] Figure 4 It is a block diagram of a urea injection control device according to an embodiment of the present application.

[0052] like Figure 4 As shown, the urea injection control device 10 includes: an acquisition module 100 , a calculation module 200 and a control module 300 .

[0053] Among them, the acquisition module 100 is used to obtain the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; the calculation module 200 is used to calculate the injection duration of the corresponding urea nozzle according to the nitrogen oxide concentration value; the control module 300 is used to determine the target injection strategy of each urea nozzle according to the injection duration of each urea nozzle, the driving number of the urea nozzle and the target control period, and control all urea nozzles to complete the urea injection action within the target control period according to the target injection strategy.

[0054] In one embodiment of the present application, the control module 300 is further used to: if the number of driven urea nozzles is one, the injection strategy is a single injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is less than the target control period, the injection strategy is an alternating injection strategy; if the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is greater than the target control period, the injection strategy is an alternating synchronous strategy.

[0055] In one embodiment of the present application, the single injection strategy is: within the target control cycle, the urea nozzle is controlled to inject at a preset time point within the target control cycle; the alternating injection strategy is: multiple urea nozzles are controlled to perform alternating injection within the target control cycle; the alternating synchronization strategy is: the injection time of each urea nozzle is combined to determine the target injection mode, and after the first urea nozzle in the target injection mode stops injecting, the driving nozzles outside the target injection mode are controlled to start injecting.

[0056] In one embodiment of the present application, the urea injection control device 10 further includes: a determination module, which is used to calculate the target urea injection amount of all urea nozzles at the current moment according to the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment before controlling all urea nozzles to perform the urea injection action within the target control period according to the target injection strategy; and determine the injection pressure value of the urea pump at the current moment according to the target urea injection amount.

[0057] In one embodiment of the present application, the determination module is further used to calculate the difference between the urea injection amount of all urea nozzles at the current moment and the previous moment; determine the pressure correction coefficient of the urea pump according to the difference in the urea injection amount; and determine the injection pressure value of the urea pump according to the pressure correction coefficient.

[0058] In one embodiment of the present application, if the difference in the urea injection amount is a positive value, it indicates that the pressure value of the urea pump increases, and if the difference in the urea injection amount is a negative value, it indicates that the pressure value of the urea pump decreases.

[0059] It should be noted that the above explanations and descriptions of the embodiment of the urea injection control method are also applicable to the urea injection control device of this embodiment, and will not be repeated here.

[0060] According to the urea injection control device proposed in the embodiment of the present application, by obtaining the nitrogen oxide concentration value at the inlet of each urea nozzle and calculating the appropriate urea injection duration, the urea injection amount can be controlled more accurately, and a reasonable injection strategy can be formulated according to the injection duration, the number of nozzles and the control cycle, which can effectively reduce the pressure fluctuations generated during the injection process and realize accurate control of urea injection. Therefore, the problem of unstable urea injection in the related art is solved.

[0061] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0062] A memory 501 , a processor 502 , and a computer program stored in the memory 501 and executable on the processor 502 .

[0063] When the processor 502 executes the program, the urea injection control method provided in the above embodiment is implemented.

[0064] Furthermore, the electronic device further comprises:

[0065] The communication interface 503 is used for communication between the memory 501 and the processor 502 .

[0066] The memory 501 is used to store computer programs that can be executed on the processor 502 .

[0067] The memory 501 may include a high-speed RAM (Random Access Memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

[0068] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected to each other through a bus and communicate with each other. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0069] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can communicate with each other through an internal interface.

[0070] The processor 502 may be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

[0071] The embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above urea injection control method is implemented.

[0072] The embodiment of the present application further provides a computer program product, including: a computer program or instructions, which, when executed, is used to implement the urea injection control method as described in the above embodiment.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0075] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0076] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0077] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A urea injection control method, characterized in that: The following steps are involved: Obtain the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; Calculating the injection time of the corresponding urea nozzle according to the nitrogen oxide concentration value; The target injection strategy of each urea nozzle is determined according to the injection duration of each urea nozzle, the driving number of the urea nozzle and the target control period, and all urea nozzles are controlled according to the target injection strategy to perform the urea injection action within the target control period.

2. The urea injection control method according to claim 1, characterized in that: Determining the target injection strategy of each urea nozzle according to the injection duration of each urea nozzle, the number of urea nozzles and the target control period includes: If the number of driven urea nozzles is one, the injection strategy is a single injection strategy; If the number of driven urea nozzles is multiple, and the total injection time of the multiple nozzles is less than the target control period, the injection strategy is an alternating injection strategy; If the number of driven urea nozzles is multiple and the total injection time of the multiple nozzles is greater than the target control period, the injection strategy is an alternating synchronization strategy.

3. The urea injection control method according to claim 2, characterized in that: Said The single injection strategy is: within the target control cycle, controlling the urea nozzle to inject at a preset time point within the target control cycle; The alternate injection strategy is: controlling the multiple urea nozzles to perform alternate injection within the target control period; The alternating synchronization strategy is: combining the injection time of each urea nozzle to determine a target injection mode, and after the first urea nozzle in the target injection mode stops injecting, controlling the urea nozzles other than the target injection mode to start injecting.

4. The urea injection control method according to claim 1, characterized in that: Before controlling all urea nozzles to perform the urea injection action within the target control period according to the target injection strategy, the method further includes: Calculating the target urea injection amount of all urea nozzles at the current moment according to the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; The injection pressure value of the urea pump at the current moment is determined according to the target urea injection amount.

5. The urea injection control method according to claim 4, characterized in that: The step of determining the injection pressure value of the urea pump at the current moment according to the target urea injection amount includes: Calculate the difference between the urea injection amount of all urea nozzles at the current moment and the previous moment; determining a pressure correction coefficient of the urea pump according to the difference in the urea injection amount; The injection pressure value of the urea pump is determined according to the pressure correction coefficient.

6. The urea injection control method according to claim 4, characterized in that: If the difference in the urea injection amount is a positive value, it indicates that the pressure value of the urea pump increases. If the difference in the urea injection amount is a negative value, it indicates that the pressure value of the urea pump decreases.

7. A urea injection control device, characterized in that: include: An acquisition module is used to obtain the nitrogen oxide concentration value at the inlet of each urea nozzle at the current moment; A calculation module, used for calculating the injection time of the corresponding urea nozzle according to the nitrogen oxide concentration value; The control module is used to determine a target injection strategy for each urea nozzle according to the injection duration of each urea nozzle, the number of driven urea nozzles and the target control period, and control all urea nozzles to perform urea injection actions within the target control period according to the target injection strategy.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the urea injection control method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program or instructions stored thereon for execution, characterized in that: When the computer program or instruction is executed, it is executed by the processor to implement the urea injection control method according to any one of claims 1 to 6.

10. A computer program product comprising: A computer program or instruction, characterized in that, when the computer program or instruction is executed, the urea injection control method according to any one of claims 1 to 6 is implemented.

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