A urea injection control method, system, device, and storage medium

Abstract

The application discloses a urea injection control method, system, device and storage medium, and is applied to the field of vehicle emission reduction technology. In the execution of the method, the gas flowing through the electric heating hydrolysis mixer is heated by electric heating, the first temperature value of the gas upstream of the selective catalytic reduction device and the second temperature value of the gas downstream of the selective catalytic reduction device are obtained, the first temperature value and the second temperature value are used to obtain the starting injection temperature value of urea, and when the starting injection temperature value of urea reaches the first preset urea injection temperature value, the urea is controlled to be injected according to the calibration amount. By obtaining the temperature values of the gases upstream and downstream of the selective catalytic reduction device, whether the preset urea injection temperature value is reached is judged by using the upstream temperature value and the downstream temperature value. Compared with directly judging the starting injection temperature value of urea by using the upstream temperature value, the method in the application can inject urea at a suitable temperature value, so that the urea can fully react with the exhaust gas, and the emission of the exhaust gas is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle emission reduction, and in particular to a urea injection control method, system, device and storage medium. BACKGROUND

[0002] With the increasingly stringent requirements of the state on vehicle emissions, vehicle pollutant emissions have received widespread attention.

[0003] When the vehicle is cold-started, the engine pollutant emissions account for more than 50% of the total emissions. According to statistics, the emission pollutants (NO, HC, CO) of the engine in the first 200 seconds of the vehicle cold-starting can account for 60%-80% of the total emissions. Therefore, the temperature during the vehicle cold-starting stage can be increased to reduce pollutant emissions, and urea injection at a certain temperature can make harmful gases be fully reacted into harmless gases, further effectively reducing exhaust emissions.

[0004] Therefore, how to select a suitable temperature and control urea injection so that harmful gases can be fully reacted into harmless gases is an urgent problem for those skilled in the art. SUMMARY

[0005] In view of the above, the present application provides a urea injection control method, system, device and storage medium, aiming to provide a urea injection control method to make urea fully react with exhaust gas and reduce exhaust emissions.

[0006] In a first aspect, the present application provides a urea injection control method, comprising:

[0007] controlling an electric heating hydrolysis mixer to be turned on, heating the gas flowing through the electric heating hydrolysis mixer, and flowing the heated gas into a selective catalytic reduction device;

[0008] obtaining a first temperature value of the gas upstream of the selective catalytic reduction device and a second temperature value of the gas downstream of the selective catalytic reduction device;

[0009] obtaining a first temperature value of the gas upstream of the selective catalytic reduction device and a second temperature value of the gas downstream of the selective catalytic reduction device;

[0010] When the urea injection temperature value reaches a first preset urea injection temperature value, controlling the urea to be injected according to a calibration amount.

[0011] Optionally, before the urea injection temperature value is obtained using the first temperature value and the second temperature value, the method further comprises:

[0012] obtaining a third temperature value, which is a preset value lower than the first preset urea injection temperature value;

[0013] The first temperature value and the second temperature value are used to obtain a first injection temperature value of urea, and the first injection temperature value is compared with a first preset urea injection temperature value.

[0014] When the second temperature value is less than the first temperature value and the second temperature value is less than the third temperature value, an average value of the first temperature value and the second temperature value is taken as a first injection temperature value of urea.

[0015] The control of the injection of urea in the calibrated amount includes:

[0016] When the first injection temperature value is equal to the first preset urea injection temperature value, the injection of urea in the calibrated amount is controlled.

[0017] Optionally, before the first temperature value and the second temperature value are used to obtain the injection temperature value of urea, the method further includes:

[0018] A third temperature value is obtained, and the third temperature value is a preset value lower than the first preset urea injection temperature value.

[0019] The first temperature value and the second temperature value are used to obtain a first injection temperature value of urea, and the first injection temperature value is compared with a first preset urea injection temperature value.

[0020] The control of the injection of urea in the calibrated amount includes:

[0021] When the second injection temperature value is equal to the first preset urea injection temperature value, the injection of urea in the calibrated amount is controlled.

[0022] Optionally, the method further includes:

[0023] When the injection of urea in the calibrated amount is controlled, the electric heating hydrolysis mixer is controlled to stop heating.

[0024] A fourth temperature value is obtained, and the fourth temperature value is a second preset urea injection temperature value.

[0025] When the first injection temperature value is less than the fourth temperature value, the injection amount of urea is controlled to be 80% of the calibrated amount.

[0026] Optionally, the method further includes:

[0027] When the first injection temperature value is less than a preset urea injection stop temperature value, the injection of urea is controlled to stop.

[0028] In a second aspect, the application provides a urea injection control system, which includes:

[0029] An electric heating hydrolysis mixer control unit is configured to control the electric heating hydrolysis mixer to be turned on, heat the gas flowing through the electric heating hydrolysis mixer, and flow the heated gas into the selective catalytic reducer;

[0030] A temperature acquisition unit is configured to acquire a first temperature value of the gas upstream of the selective catalytic reducer and a second temperature value of the gas downstream of the selective catalytic reducer;

[0031] The temperature acquisition unit is further configured to obtain a urea injection start temperature value by using the first temperature value and the second temperature value.

[0032] A urea injection unit is configured to control the urea to be injected at a calibration amount when the urea injection start temperature value reaches a first preset urea injection temperature value.

[0033] Optionally, the temperature acquisition unit is further configured to acquire a third temperature value, which is a preset value lower than the first preset urea injection temperature value.

[0034] When the second temperature value is less than the first temperature value and the second temperature value is less than the third temperature value, an average value of the first temperature value and the second temperature value is taken as a first injection start temperature value.

[0035] The urea injection unit is specifically configured to control the urea to be injected at the calibration amount when the first injection start temperature value is equal to the first preset urea injection temperature value.

[0036] Optionally, the temperature acquisition unit is further configured to acquire a third temperature value, which is a preset value lower than the first preset urea injection temperature value.

[0037] When the second temperature value is greater than the first temperature value or the second temperature value is greater than the third temperature value, the first temperature value is taken as a second injection start temperature value.

[0038] The urea injection unit is specifically configured to control the urea to be injected at the calibration amount when the second injection start temperature value is equal to the first preset urea injection temperature value.

[0039] Optionally, the electric heating hydrolysis mixer control unit is further configured to control the electric heating hydrolysis mixer to stop heating when the urea is injected at the calibration amount.

[0040] The temperature acquisition unit is further configured to acquire a fourth temperature value, which is a second preset urea injection temperature value.

[0041] The urea injection unit is further configured to control the urea injection amount to be 80% of the calibration amount when the first injection start temperature value is less than the fourth temperature value.

[0042] Optionally, the urea injection unit is further configured to control the urea to stop injection when the first start injection temperature value is less than a preset urea stop injection temperature value.

[0043] In a third aspect, the present application provides a computer device, which comprises a memory and a processor, the memory is configured to store a computer program, and the processor is configured to execute the computer program to implement the urea injection control method in the first aspect.

[0044] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the urea injection control method in the first aspect.

[0045] The present application provides a urea injection control method. When the method is executed, the electric heating hydrolysis mixer is first controlled to be turned on, the gas flowing through the electric heating hydrolysis mixer is heated, the heated gas flows into the selective catalytic reduction device, then the first temperature value of the gas upstream of the selective catalytic reduction device and the second temperature value of the gas downstream of the selective catalytic reduction device are obtained, the start injection temperature value of the urea is obtained by using the first temperature value and the second temperature value, and when the start injection temperature value of the urea reaches the first preset urea injection temperature value, the urea is controlled to be injected according to the calibration amount. In this way, by obtaining the temperature values of the gas flowing through the upstream and downstream of the selective catalytic reduction device, and then using the upstream temperature value and the downstream temperature value to determine whether the preset urea injection temperature value is reached, compared with directly using the upstream temperature value to determine the start injection temperature value of the urea, the method in the present application can inject the urea at a suitable temperature value, so that the urea can fully react with the exhaust gas, and the emission of the exhaust gas is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0046] To make the technical solutions in the embodiments or the prior art clearer, the accompanying drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.

[0047] Figure 1 A flow chart of a urea injection control method provided by an embodiment of the present application;

[0048] Figure 2 A schematic diagram of an exhaust gas treatment process provided by an embodiment of the present application;

[0049] Figure 3 A flow chart of another urea injection control method provided by an embodiment of the present application;

[0050] Figure 4 A structure schematic diagram of a urea injection control system provided by an embodiment of the present application is shown in the figure.

[0051] Figure 5 A structure schematic diagram of a computer device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0052] As described in the background of the present application, when a vehicle is cold started, it will emit more exhaust gas, so the starting temperature needs to be increased. However, after the electric heating hydrolysis mixer is turned on, the gas upstream of the selective catalytic reduction (SCR) will rapidly increase to the urea injection temperature, while the gas downstream of the SCR needs several minutes to increase to a temperature at which urea can be hydrolyzed. Therefore, when urea is injected when the temperature difference between the upstream and downstream gases is large, the reaction will not be sufficient.

[0053] To solve the above technical problem, an embodiment of the present application provides a urea injection control method, which comprises the following steps:

[0054] controlling the electric heating hydrolysis mixer to be turned on, heating the gas flowing through the electric heating hydrolysis mixer, flowing the heated gas into the selective catalytic reduction device, then obtaining a first temperature value of the gas upstream of the selective catalytic reduction device and a second temperature value of the gas downstream of the selective catalytic reduction device, obtaining a urea injection temperature value by using the first temperature value and the second temperature value, and controlling urea to be injected according to a calibration amount when the urea injection temperature value reaches a first preset urea injection temperature value.

[0055] In this way, by obtaining the temperature values of the gas flowing through the upstream and downstream of the selective catalytic reduction device, and then using the upstream temperature value and the downstream temperature value to determine whether the preset urea injection temperature value is reached, compared with directly using the upstream temperature value to determine the urea injection temperature value, the method in the present application can inject urea at a suitable temperature value, so that the urea and the exhaust gas can fully react, and the emission of the exhaust gas is reduced.

[0056] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0057] Figure 1 A flowchart of a urea injection control method provided by an embodiment of the present application is shown in the figure. The method is described in combination with Figure 1As shown, the urea injection control method provided by the embodiments of the present application can include:

[0058] S101, control the electric heating hydrolysis mixer to be turned on, heat the gas flowing through the electric heating hydrolysis mixer, and the heated gas flows into the selective catalytic reducer.

[0059] The engine of the vehicle generates exhaust gas during operation. If the exhaust gas is directly discharged without treatment, it will cause air pollution. The specific treatment process is as follows Figure 2 As shown, Figure 2 The schematic diagram of the exhaust gas treatment process provided by the embodiments of the present application is shown. The exhaust gas generated during the operation of the engine is treated by the oxidation catalyst, the particulate trap, the electric heating hydrolysis mixer, the mixer and the selective catalytic reducer, and finally the treated gas is obtained. When the vehicle is cold started, the electric heating hydrolysis mixer needs to be controlled to be turned on. The electric heating hydrolysis mixer can heat the gas to improve the temperature during the cold start stage, thereby reducing the emission of pollutants. The electric heating hydrolysis mixer is installed before the SCR, and the temperature of the exhaust gas is rapidly raised by the electric heating disc.

[0060] S102, obtain a first temperature value of the gas upstream of the selective catalytic reducer and a second temperature value of the gas downstream of the selective catalytic reducer.

[0061] After the gas is heated by the electric heating hydrolysis mixer, the temperature will rise, as shown in Figure 2 As shown, the temperature value of the upstream gas is obtained by the sensor 1 as the first temperature value, and the temperature value of the downstream gas is obtained by the sensor 2 as the second temperature value. The sensor 1 and the sensor 2 are both temperature sensors.

[0062] S103, obtain the urea injection temperature value by using the first temperature value and the second temperature value.

[0063] The urea injection temperature value is obtained according to the first temperature value and the second temperature value. Specifically, the average of the first temperature value and the second temperature value can be taken as the urea injection temperature value.

[0064] S104, when the urea injection temperature value reaches a first preset urea injection temperature value, control the urea to be injected according to a calibration amount.

[0065] The first preset urea injection temperature value refers to a temperature at which urea injection is started and which is preset when the electrically heated hydrolyzer is in operation. When the first temperature value and the second temperature value are obtained, the start injection temperature value is compared with the first preset urea injection temperature. Since the electrically heated hydrolyzer is in operation to heat the gas, the first temperature value and the second temperature value change. When the average of the first temperature value and the second temperature value is smaller at the beginning of heating, the average of the first temperature value and the second temperature value is the same as the first preset urea injection temperature as the heating continues. This indicates that urea injection can be performed at this time. The calibration quantity refers to a preset urea injection quantity. The preset injection quantity is set by a person skilled in the art according to actual conditions, which is not limited herein.

[0066] The above embodiment provides a urea injection control method. The start injection temperature value of urea is obtained according to the first temperature value and the second temperature value. When the start injection temperature value of urea reaches the first preset urea injection temperature value, urea is controlled to be injected at a calibration quantity. It should be noted that the calculation method of the start injection temperature value of urea is different as the first temperature value and the second temperature value change. The present embodiment provides another urea injection control method, which is described below in combination with specific embodiments.

[0067] Figure 3 The flowchart of another urea injection control method provided in the present embodiment is shown in FIG. 8. In combination with FIG. 8, the urea injection control method can specifically include the following steps. Figure 3

[0068] S301: The electrically heated hydrolysis mixer is controlled to be turned on, the gas flowing through the electrically heated hydrolysis mixer is heated, and the heated gas flows into the selective catalytic reduction device.

[0069] In the present embodiment, the technical details of S301 can be referred to the related description of S101 in the above embodiment, which is not repeated here.

[0070] S302: A first temperature value of the gas upstream of the selective catalytic reduction device and a second temperature value of the gas downstream of the selective catalytic reduction device are obtained.

[0071] In the present embodiment, the technical details of S302 can be referred to the related description of S102 in the above embodiment, which is not repeated here.

[0072] S303: A third temperature value is obtained, which is a preset value lower than the first preset urea injection temperature value.

[0073] ​The first preset urea injection temperature value refers to a temperature at which urea injection is preset to start when the electrically heated hydrolyzer is in operation, and the third temperature value is a lower temperature value preset to be lower than the temperature at which urea injection is preset to start when the electrically heated hydrolyzer is in operation.

[0074] S304: When the second temperature value is less than the first temperature value and the second temperature value is less than the third temperature value, an average of the first temperature value and the second temperature value is taken as a first injection temperature value.

[0075] When the exhaust gas is treated, it needs to be treated by SCR, and when the upstream temperature of the SCR is increased, the temperature inside the SCR may not reach a temperature value suitable for urea injection. Therefore, when the downstream temperature is low, it indicates that the temperature inside the SCR is lower. At this time, the temperature inside the SCR needs to be judged in combination with the upstream and downstream gas temperature values. When the temperature value of the downstream gas is lower than the temperature value of the upstream gas, and the temperature value of the downstream gas is lower than the third temperature value, an average of the temperature value of the upstream gas and the temperature value of the downstream gas is taken as the first injection temperature value, and whether the temperature suitable for urea injection is reached is judged according to the first injection temperature value.

[0076] S305: When the first injection temperature value is equal to the first preset urea injection temperature value, urea is controlled to be injected according to a calibration amount.

[0077] The first preset urea injection temperature is a constant value, which is used to measure whether urea can be injected. Therefore, when the first injection temperature value is equal to the first preset urea injection temperature value, urea can be controlled to be injected according to a calibration amount.

[0078] S306: When the second temperature value is greater than the first temperature value or the second temperature value is greater than the third temperature value, the first temperature value is taken as a second injection temperature value.

[0079] When the downstream temperature is high, it indicates that the temperature inside the SCR is high, and the temperature of the upstream gas can be directly taken as the second injection temperature value.

[0080] S307: When the second injection temperature value is equal to the first preset urea injection temperature value, urea is controlled to be injected according to a calibration amount.

[0081] When the second injection temperature reaches the first urea injection temperature value at which urea injection can be performed, urea can be controlled to be injected according to a calibration amount.

[0082] Since the electrically heated hydrolysis mixer is used to avoid the vehicle engine from emitting a large amount of exhaust gas at cold start, when the upstream gas and the downstream gas are heated to a certain temperature and start to spray urea, the electrically heated hydrolysis mixer is controlled to stop heating to save energy. It can be understood that the vehicle engine generates exhaust gas during operation, and when the vehicle engine stops working and the electrically heated hydrolysis mixer does not heat, for example, during the process of deceleration to stop of a vehicle with a diesel engine, the temperature gradually decreases, and if urea is still sprayed according to the calibration amount in this case, it will cause waste of urea.

[0083] To solve this problem, an implementation method provided by an embodiment of the present application further includes obtaining a fourth temperature value, which is a second preset urea spraying temperature value, for example, the fourth temperature can be set to 200℃, and when the first spraying temperature value, i.e., the average of the upstream gas temperature value and the downstream gas temperature value, is less than the fourth temperature value, the urea spraying amount is controlled to be 80% of the calibration amount. Since the temperature gradually decreases and the exhaust gas generated by the engine gradually decreases until the engine stops working, when the first spraying temperature value is less than a preset urea stop spraying temperature value, the urea spraying is controlled to stop.

[0084] The above is some specific implementation manners of the urea spraying control method provided by an embodiment of the present application. Based on this, the present application also provides a corresponding system. The system provided by an embodiment of the present application will be introduced from the perspective of functional modularization.

[0085] Figure 4 A structure diagram of a urea spraying control system provided by an embodiment of the present application is shown in FIG. 4. In combination with FIG. 4, the urea spraying control system 400 provided by an embodiment of the present application includes: Figure 4

[0086] An electrically heated hydrolysis mixer control unit 410 is configured to control the electrically heated hydrolysis mixer to be turned on, heat the gas flowing through the electrically heated hydrolysis mixer, and flow the heated gas into the selective catalytic reduction device.

[0087] A temperature acquisition unit 420 is configured to acquire a first temperature value of the upstream gas of the selective catalytic reduction device and a second temperature value of the downstream gas of the selective catalytic reduction device.

[0088] The temperature acquisition unit is further configured to obtain a urea spraying temperature value by using the first temperature value and the second temperature value.

[0089] A urea spraying unit 430 is configured to control urea to be sprayed according to a calibration amount when the urea spraying temperature value reaches a first preset urea spraying temperature value.

[0090] ​In an implementation form of the embodiment of the application, the temperature obtaining unit is further configured to obtain a third temperature value, the third temperature value being a preset value lower than the first preset urea injection temperature value.

[0091] When the second temperature value is less than the first temperature value and the second temperature value is less than the third temperature value, an average of the first temperature value and the second temperature value is taken as a first start injection temperature value.

[0092] The urea injection unit is specifically configured to, when the first start injection temperature value is equal to the first preset urea injection temperature value, control urea to be injected in a calibration amount.

[0093] In an implementation form of the embodiment of the application, the temperature obtaining unit is further configured to obtain a third temperature value, the third temperature value being a preset value lower than the first preset urea injection temperature value.

[0094] When the second temperature value is greater than the first temperature value or the second temperature value is greater than the third temperature value, the first temperature value is taken as a second start injection temperature value.

[0095] The urea injection unit is specifically configured to, when the second start injection temperature value is equal to the first preset urea injection temperature value, control urea to be injected in a calibration amount.

[0096] In an implementation form of the embodiment of the application, the electric heating hydrolysis mixer control unit is further configured to, when urea is injected in the calibration amount, control the electric heating hydrolysis mixer to stop heating.

[0097] The temperature obtaining unit is further configured to obtain a fourth temperature value, the fourth temperature value being a second preset urea injection temperature value.

[0098] The urea injection unit is further configured to, when the first start injection temperature value is less than the fourth temperature value, control the urea injection amount to be 80% of the calibration amount.

[0099] In an implementation form of the embodiment of the application, the urea injection unit is further configured to, when the first start injection temperature value is less than a preset urea stop injection temperature value, control urea to stop injection.

[0100] The embodiment of the application also provides a corresponding device and a computer storage medium for implementing the scheme provided by the embodiment of the application.

[0101] As Figure 5As shown, the computer device 01 is in the form of a general- purpose computer device. The components of the computer device 01 can include, but are not limited to, one or more processors or processor units 03, a system memory 08, and a bus 04 that couples various system components including the system memory 08 to the processor unit 03.

[0102] The bus 04 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics accelerator bus, a processor or local bus using any of a variety of bus architectures. By way of example, these architectures include an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0103] The computer device 01 typically includes a variety of computer system readable media. Such media can be any available media that is located either in or out of the computer device 01, such as volatile and non-volatile media, removable and non-removable media.

[0104] The system memory 08 can include computer system readable media in the form of volatile memory, such as random access memory (RAM) 09 and / or cache memory 10. The computer device 01 can further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, a storage system 11 can be provided for reading from and writing to non-removable, non-volatile magnetic media (e.g., a "hard drive"). Figure 5 Not shown, a removable / non-removable interface can also be provided and interconnected to the bus 04 to enable connection to and Figure 5 In alternative embodiments, a disk drive can be provided for reading from and writing to a removable, non-volatile media (e.g., a "floppy disk"), and an optical disk drive can be provided for reading from and writing to a removable, non-volatile media (e.g., a CD-ROM, DVD-ROM, or other optical media). In these instances, each drive can be connected to the bus 04 by one or more data media interfaces. The memory 08 can include a system memory, which can include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the application.

[0105] The program / utility 12, having a set (at least one) of program modules 13, can be stored in memory 08 by way of example, and not limitation, as well as an operating system, one or more application programs, other program modules, and program data, each or some combination thereof, can include implementation of a network environment. The program modules 13 generally carry out the functions and / or methodologies of embodiments of the application as described herein.

[0106] Computer device 01 can also communicate with one or more external devices 02 such as a keyboard or pointing devices, displays 07, etc.; one or more devices that enable a user to interact with computer device 01 ; and / or any devices (e.g., network card, modem, etc.) that enable computer device 01 to communicate with one or more other computing devices. Such communication can occur via Input / Output (I / O) interface(s) 06. Still yet, computer device 01 can communicate with one or more networks, such as a local area network (LAN), a general wide area network (WAN), and / or a public network (e.g., the Internet) via network adapter 05. As depicted, network adapter 05 communicates with the other components of computer device 01 via bus 04. It should be understood that although not shown, other hardware and / or software components could be used in conjunction with computer device 01. These include, but are not limited to, microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data archival storage systems, etc. Figure 5 Figure 5 It should be understood that, although not specifically shown, elements of the present application can include other processes and / or devices that are descriptive by way of example only and can be used in conjunction with the present application. It is to be understood that the elements and / or devices of the foregoing examples, and any other such suitable elements and / or devices not specifically named are intended to be included within the scope of the present application.

[0107] Processor unit 03 performs a variety of functions including executing program components according to the instructions provided by system memory 08.

[0108] Those skilled in the art will clearly understand that all or part of the steps of the above-mentioned method can be implemented by means of software plus a general hardware platform. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product. The computer software product can be stored in a storage medium, such as a read-only memory (ROM) / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in the various embodiments or some parts of the embodiments of the present application.

[0109] ​It should be noted that, in the specification, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", 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 does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0110] It should also be noted that each of the embodiments described in the specification illustrate aspects of the application and are not meant to be an exhaustive list of all possible embodiments. The scope of the application is therefore intended to cover all possible embodiments that are within the scope of the claims. Furthermore, the description of the embodiments is not meant to limit the scope of the application to the exact embodiments described. The scope of the application is intended to cover all possible embodiments that are within the scope of the claims.

[0111] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art without any creative effort, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A urea injection control method characterized by comprising: The method includes: The electrically heated hydrolysis mixer is turned on to heat the gas flowing through it, and the heated gas flows into the selective catalytic reduction unit. Obtain the first temperature value of the gas upstream of the selective catalytic reducer and the second temperature value of the gas downstream of the selective catalytic reducer; The spraying temperature of urea is obtained by using the first temperature value and the second temperature value. When the initial spraying temperature of the urea reaches the first preset urea spraying temperature, the urea is controlled to be sprayed according to the calibrated amount. Before obtaining the urea spraying temperature value using the first temperature value and the second temperature value, the method further includes: Obtain a third temperature value, wherein the third temperature value is a preset value that is lower than the first preset urea injection temperature value; The method of obtaining the urea spraying temperature value using the first temperature value and the second temperature value includes: When the second temperature value is less than the first temperature value and the second temperature value is less than the third temperature value, the average value of the first temperature value and the second temperature value shall be used as the first spraying temperature value. The control of urea injection according to the calibrated amount includes: When the first initial spray temperature value is equal to the first preset urea spray temperature value, the urea is controlled to be sprayed according to the calibrated amount.

2. The method of claim 1, wherein, When the second temperature value is greater than the first temperature value or the second temperature value is greater than the third temperature value, the first temperature value is taken as the second spraying temperature value; The control of urea injection according to the calibrated amount includes: When the second initial spray temperature value is equal to the first preset urea spray temperature value, the urea is controlled to be sprayed according to the standard amount.

3. The method of claim 1, wherein, The method further includes: When urea is injected according to the specified dosage, the electrically heated hydrolysis mixer is controlled to stop heating. Obtain a fourth temperature value, wherein the fourth temperature value is a second preset urea injection temperature value; When the first initial spray temperature is less than the fourth temperature, the urea injection volume is controlled to be 80% of the calibrated volume.

4. The method of claim 3, wherein, The method further includes: When the initial spray temperature is lower than the preset urea stop spray temperature, the urea spraying is stopped.

5. A urea injection control system characterized by comprising: The system includes: The electric heating hydrolysis mixer control unit is used to control the electric heating hydrolysis mixer to turn on, heat the gas flowing through the electric heating hydrolysis mixer, and the heated gas flows into the selective catalytic reduction unit; A temperature acquisition unit is used to acquire a first temperature value of the gas upstream of the selective catalytic reducer and a second temperature value of the gas downstream of the selective catalytic reducer. The temperature acquisition unit is also used to obtain the spraying temperature value of urea using the first temperature value and the second temperature value. The urea injection unit is used to control the urea to be injected according to the calibrated amount when the initial injection temperature of the urea reaches the first preset urea injection temperature value. The temperature acquisition unit is further configured to acquire a third temperature value, wherein the third temperature value is a preset value that is lower than the first preset urea injection temperature value. When the second temperature value is less than the first temperature value and the second temperature value is less than the third temperature value, the average value of the first temperature value and the second temperature value shall be used as the first spraying temperature value. The urea injection unit is specifically configured to control urea to be injected in a calibration amount when the first injection temperature value is equal to the first preset urea injection temperature value.

6. The system of claim 5, wherein, The electric heating hydrolysis mixer control unit is further configured to control the electric heating hydrolysis mixer to stop heating when the urea is injected in the calibration amount. The temperature acquisition unit is further configured to acquire a fourth temperature value, the fourth temperature value being a second preset urea injection temperature value. The urea injection unit is further configured to control the urea injection amount to be 80% of the calibration amount when the first injection temperature value is less than the fourth temperature value.

7. A computer device, comprising: The device comprises a memory and a processor. The memory is configured to store a computer program. The processor is configured to implement the urea injection control method according to any one of claims 1 to 4 when executing the computer program.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the urea injection control method according to any one of claims 1 to 4.

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