Method, device and equipment for judging mixing degree of mixer and storage medium

Abstract

The application provides a mixer crystallization degree judgment method, device, equipment and storage medium. The method comprises the following steps: obtaining the exhaust flow of an input mixer, the temperature of the mixer and the urea injection amount injected into the mixer; increasing the timing time when the urea injection amount is not less than the urea injection amount threshold value, the urea injection amount threshold value being obtained by using the exhaust flow and the temperature; reducing the timing time when the temperature is greater than the preset temperature and the urea injection amount of the mixer is less than the preset urea injection amount, the preset urea injection amount being obtained by using the urea injection amount threshold value; and obtaining the crystallization degree judgment result of the mixer by using the timing time. The application provides a mixer crystallization degree judgment method, which can eliminate crystallization by the detection result of the crystallization degree of the mixer, thereby reducing the risk of vehicle emission exceeding the standard.

Description

Technical Field

[0001] This application relates to the field of exhaust gas treatment technology, and in particular to a method, apparatus, device and storage medium for determining the degree of crystallization in a mixer. Background Technology

[0002] Selective Catalytic Reduction (SCR) is a system for treating engine exhaust gases. SCR systems selectively catalytically reduce nitrogen oxides (NOx) in engine exhaust gases into nitrogen and water, thus reducing NOx emissions and preventing environmental pollution. The working principle of an SCR system involves spraying urea into the engine exhaust gases, where a catalyst causes the urea to react with the NOxes in the exhaust gases to produce nitrogen and water.

[0003] The mixer is a crucial component of the SCR system. Its primary function is to promote the pyrolysis and hydrolysis of urea, thereby improving the SCR system's efficiency in converting nitrogen oxides. However, after a period of use, crystals will form in the mixer. These crystals can interfere with the mixer's normal operation, ultimately leading to excessive emissions and environmental problems.

[0004] There is no existing method for judging the degree of crystallization in a mixer. Therefore, how to judge the degree of crystallization in a mixer has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a method, apparatus, device, and storage medium for determining the degree of crystallization in a mixer, thereby resolving the issue that existing technologies cannot determine the degree of crystallization in a mixer.

[0006] This application provides a method for determining the degree of crystallization in a mixer, the method comprising the following steps:

[0007] The exhaust gas flow rate into the mixer, the temperature of the mixer, and the amount of urea injected into the mixer are obtained.

[0008] When the urea injection quantity is not less than the urea injection quantity threshold, the timing time is increased. The urea injection quantity threshold is obtained using the exhaust gas flow rate and the temperature.

[0009] When the temperature is greater than the preset temperature and the urea injection amount of the mixer is less than the preset urea injection amount, the timing time is reduced. The preset urea injection amount is obtained using the urea injection amount threshold.

[0010] The degree of crystallization of the mixer is determined by using the time measurement.

[0011] Optionally, the urea injection volume threshold can be obtained by the following method:

[0012] The waste gas flow rate is input into the mixer at the specified temperature, and urea is continuously injected into the mixer;

[0013] When crystallization occurs in the mixer, the injection of urea into the mixer is stopped, and the total amount of urea injected into the mixer is used as the urea injection amount threshold.

[0014] Optionally, the method for determining the degree of crystallization in the mixer further includes:

[0015] Multiple different exhaust gas flow rates and multiple different temperatures are obtained, and the multiple different exhaust gas flow rates are respectively used as target exhaust gas flow rates, and the multiple different temperatures are respectively used as target temperatures;

[0016] The target exhaust gas flow rate is input into a mixer at the target temperature and urea is continuously injected into the mixer;

[0017] When crystallization occurs in the mixer, the injection of urea into the mixer is stopped, and the amount of urea injected into the mixer is used as the threshold for the urea injection amount at the target exhaust gas flow rate and the target temperature.

[0018] Optionally, obtaining the crystallization degree judgment result of the mixer using the timing time includes:

[0019] When the timing time is less than the first time threshold, the crystallization degree judgment result of the mixer is determined to be no risk of crystallization.

[0020] When the timing time is greater than or equal to the first time threshold and less than the second time threshold, the crystallization degree judgment result of the mixer is determined to be low crystallization risk;

[0021] When the timing time is greater than or equal to the second time threshold and less than the third time threshold, the crystallization degree judgment result of the mixer is determined to be of medium crystallization risk;

[0022] When the timing time is greater than or equal to the third time threshold, the crystallization degree judgment result of the mixer is determined to be of high crystallization risk.

[0023] This application also provides a device for determining the degree of crystallization in a mixer, the device comprising the following modules:

[0024] The acquisition module is used to acquire the exhaust gas flow rate of the input mixer, the temperature of the mixer, and the amount of urea injected into the mixer;

[0025] The timing time increment module is used to increase the timing time when the urea injection quantity is not less than the urea injection quantity threshold, wherein the urea injection quantity threshold is obtained using the exhaust gas flow rate and the temperature.

[0026] A timing reduction module is used to reduce the timing time when the temperature is greater than a preset temperature and the urea injection quantity of the mixer is less than a preset urea injection quantity, wherein the preset urea injection quantity is obtained using the urea injection quantity threshold.

[0027] The crystallization degree judgment module is used to obtain the crystallization degree judgment result of the mixer using the timing time.

[0028] Optionally, the urea injection volume threshold is obtained through the following module:

[0029] A mixer experimental module is used to input the waste gas flow rate into the mixer at the temperature and continuously inject urea into the mixer;

[0030] The urea injection volume threshold determination module is used to stop injecting urea into the mixer when crystallization occurs in the mixer, and to use the total amount of urea injected into the mixer as the urea injection volume threshold.

[0031] Optionally, the device for determining the degree of crystallization in the mixer further includes:

[0032] The experimental data acquisition module is used to acquire multiple different exhaust gas flow rates and multiple different temperatures, and to take the multiple different exhaust gas flow rates as target exhaust gas flow rates and the multiple different temperatures as target temperatures.

[0033] The mixer target condition experimental module is used to input the target exhaust gas flow rate into the mixer at the target temperature and continuously inject urea into the mixer;

[0034] The target urea injection quantity threshold determination module is used to stop injecting urea into the mixer when crystallization occurs in the mixer, and to use the amount of urea injected into the mixer as the target exhaust gas flow rate and the urea injection quantity threshold at the target temperature.

[0035] Optionally, the crystallinity determination module includes:

[0036] A no-crystallization-risk determination unit is used to determine the crystallization degree judgment result of the mixer as having no crystallization risk when the timing time is less than a first time threshold.

[0037] A low crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as low crystallization risk when the timing time is greater than or equal to a first time threshold and less than a second time threshold.

[0038] The medium crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as medium crystallization risk when the timing time is greater than or equal to the second time threshold and less than the third time threshold;

[0039] A high crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as high crystallization risk when the timing time is greater than or equal to a third time threshold.

[0040] This application also provides an electronic device, which includes a processor and a memory:

[0041] The memory is used to store computer programs and to transfer the computer programs to the processor;

[0042] The processor is used to execute the steps of the above-described method for determining the degree of crystallization of the mixer according to the instructions in the computer program.

[0043] This application also provides a computer-readable storage medium, characterized in that the computer-readable storage medium is used to store a computer program, which, when executed by an electronic device, implements the steps of the above-described method for determining the degree of crystallization of a mixer.

[0044] Compared with the prior art, this application has the following beneficial effects:

[0045] This application determines the degree of crystallization in a vehicle mixer by combining the exhaust gas flow rate, mixer temperature, and urea injection quantity into the mixer with a timing interval. The method provides a urea injection quantity threshold, obtained using exhaust gas flow rate and temperature. Different flow rates and temperatures correspond to different urea injection quantity thresholds. By setting this threshold, it determines whether crystallization will occur in different mixers under different operating conditions. Whether crystallization occurs is reflected by the timing interval. Furthermore, this application considers the elimination of crystallization within the mixer. It sets corresponding conditions to reduce the timing interval, thereby representing the mixer's elimination of crystallization. Finally, the degree of crystallization is determined by the timing interval. This application provides an accurate method for determining the degree of crystallization in a mixer. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 A flowchart illustrating a method for determining the degree of crystallization in a mixer, as provided in an embodiment of this application;

[0048] Figure 2 This is a schematic diagram of a device for determining the degree of crystallization in a mixer, provided in an embodiment of this application. Detailed Implementation

[0049] As described earlier, Selective Catalytic Reduction (SCR) is a system for treating engine exhaust gases, and the mixer is a crucial component of the SCR system. The more crystals in the mixer, the weaker the SCR system's effect on exhaust gas treatment. When the crystals in the mixer reach a certain level, it will cause emissions to exceed standards.

[0050] Research has revealed that existing technologies exist for eliminating crystals in mixers. However, because the degree of crystallization in the mixer cannot be determined, it's also impossible to accurately determine when to eliminate it. Considering emissions exceeding limits, eliminating crystals in the mixer before they are present or when only a small amount exists is not only costly but also wasteful of resources. Conversely, delaying crystal removal after extended vehicle use often results in emissions exceeding limits before the crystals are eliminated. Current technology also lacks a method for judging the degree of crystallization in the mixer. If the degree of crystallization could be determined and an alert issued, crystals could be eliminated at the most appropriate time, saving costs and preventing emissions from exceeding limits.

[0051] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0052] It is understood that the method provided in this application can be applied to processing equipment capable of acquiring exhaust gas flow rate, temperature, and urea injection volume, such as a terminal device or server capable of acquiring these parameters. The method provided in this application can be executed independently by a terminal device or server, or it can be applied to network scenarios where the terminal device and server communicate, executing in cooperation. The terminal device can be a computer, mobile phone, or other similar device. The server can be understood as an application server or a web server; in actual deployment, the server can be a standalone server or a cluster server.

[0053] Figure 1 A flowchart of a method for determining the degree of crystallization in a mixer provided in this application, the method comprising the following steps:

[0054] S101: Obtain the exhaust gas flow rate, mixer temperature, and urea injection quantity into the mixer.

[0055] The processing equipment acquires the exhaust gas flow rate input to the mixer, the mixer temperature, and the amount of urea injected into the mixer. This data can typically be obtained from the vehicle's ECU.

[0056] The Electronic Control Unit (ECU), also known as the brain of a vehicle, is responsible for controlling the vehicle's driving status. It primarily uses data acquisition and exchange from various sensors and buses to determine the vehicle's condition and then controls the car via actuators.

[0057] The ECU can control the operation of the SCR system. The terminal equipment can obtain data such as the exhaust gas flow rate into the mixer, the temperature of the mixer, and the amount of urea injected into the mixer from the ECU.

[0058] The data input into S101, such as the exhaust gas flow rate of the mixer, the temperature of the mixer, and the amount of urea injected into the mixer, are all real-time data during the actual driving process of the vehicle.

[0059] S102: Increase the timing time when the urea injection volume is not less than the urea injection volume threshold.

[0060] The processing equipment can determine in real time whether the urea injection volume is not less than the urea injection volume threshold. When the urea injection volume is not less than the urea injection volume threshold, the timing time is increased.

[0061] The urea injection rate threshold is obtained using exhaust gas flow rate and temperature, and there is a corresponding relationship between the urea injection rate threshold and exhaust gas flow rate and temperature.

[0062] In one possible implementation, the ECU obtains the exhaust gas flow rate of 500 m³ / h and the temperature of 300 degrees Celsius at a certain moment during vehicle operation. The urea injection threshold at this moment corresponds to the exhaust gas flow rate of 500 m³ / h and the temperature of 300 degrees Celsius. The urea injection threshold at this moment can be determined in advance through experiments.

[0063] For example, a crystallization boundary experiment will be conducted on the vehicle's engine and SCR system. The conditions for the crystallization boundary experiment are an exhaust gas flow rate of 500 and a temperature of 300 degrees Celsius. The mixer in the SCR system is heated to 300 degrees Celsius, and urea is continuously sprayed into the mixer under these conditions using an exhaust gas flow rate of 500. Crystallization occurs in the mixer, and urea injection is stopped. The state in the mixer where crystallization is about to occur but has not yet occurred is called the crystallization boundary of the mixer. The total amount of urea injected into the mixer is taken as the urea injection threshold for an exhaust gas flow rate of 500 and a temperature of 300 degrees Celsius.

[0064] The timing time is used to indicate the time it takes for crystals to form in the mixer. When the urea injection rate is not less than the urea injection rate threshold, it means that crystals have already formed, and the timing time is increased at this point.

[0065] Since the exhaust gas flow rate, the mixer temperature, and the amount of urea injected into the mixer correspond to a specific moment, in one possible implementation, the treatment equipment determines that the urea injection amount is greater than the urea injection amount threshold corresponding to that moment at the moment one hour after the vehicle has been traveling, and the timing time begins to increase; the treatment equipment determines that the urea injection amount is less than the urea injection amount threshold corresponding to that moment at the moment one hour and fifteen minutes after the vehicle has been traveling, and the treatment equipment does not determine that the urea injection amount is less than the urea injection amount threshold at any moment within the fifteen minutes between one hour and one hour and fifteen minutes, the timing time increases by fifteen minutes.

[0066] S103: When the temperature is higher than the preset temperature and the urea injection volume of the mixer is less than the preset urea injection volume, reduce the timing time.

[0067] Besides generating crystals, the mixer can also eliminate some crystals inside during vehicle operation under certain conditions. A specific temperature is a condition for this elimination; the preset temperature can be determined based on actual vehicle operation, representing the temperature at which crystal elimination begins. Preset temperatures can be 350 degrees Celsius, 375 degrees Celsius, or 400 degrees Celsius, etc., but 350 degrees Celsius is generally chosen.

[0068] Another factor affecting the elimination of internal crystallization in the mixer is the urea injection rate. It's understandable that even if the temperature conditions for crystallization elimination are met inside the mixer, continuous injection of urea will still generate crystals. The rate of crystal formation exceeds the rate of crystallization elimination, resulting in overall crystal formation rather than crystallization elimination. Therefore, in addition to temperature, the treatment equipment must also determine if the urea injection rate is less than a preset urea injection rate. This preset urea injection rate can be obtained using a threshold urea injection rate at that specific moment. In one possible implementation, the preset urea injection rate can be 0.8 times the threshold urea injection rate at that specific moment.

[0069] When the processing equipment determines that the temperature is higher than the preset temperature and the urea injection volume of the mixer is less than the preset urea injection volume, the timing time is reduced until the processing equipment determines that the above conditions are not met.

[0070] S104: The degree of crystallization of the mixer is determined by the timing.

[0071] The timing time can reflect the degree of crystallization inside the mixer, and the processing equipment uses the timing time to obtain the result of judging the degree of crystallization of the mixer.

[0072] Here, a time threshold can be set according to the actual situation, and the degree of crystallization in the mixer can be reflected by comparing the timing time and the time threshold.

[0073] In one possible implementation, 20 hours can be set as the first time threshold. The processing device identifies the relationship between the timing time and the first time threshold in real time. When the timing time is less than the first time threshold, it can be understood that there is crystallization in the mixer. However, the crystallization will not have any impact on the actual operation of the mixer, that is, there is no risk of crystallization. For example, if the processing device determines that the timing time is 8 hours at a certain moment, and 8 hours is less than 20 hours, the processing device can determine the crystallization degree of the mixer as having no risk of crystallization.

[0074] In addition to setting a first time threshold, a second time threshold can also be set. For example, 35 hours can be set as the second time threshold. When the timing time is greater than or equal to the first time threshold and less than the second time threshold, it can be understood that a certain amount of crystals have been generated in the mixer, and the crystals begin to affect the actual operation of the mixer, which is a low crystallization risk. For example, if the processing equipment determines that the timing time is 25 hours at a certain moment, and 25 hours is greater than 20 hours and less than 35 hours, the processing equipment can determine the crystallization degree of the mixer as a low crystallization risk.

[0075] In addition to setting the first and second time thresholds, a third time threshold can also be set. For example, 50 hours can be set as the third time threshold. When the timing time is greater than or equal to the second time threshold and less than the third time threshold, it can be understood that a lot of crystals have been generated in the mixer. The crystals have affected the actual operation of the mixer to a certain extent, which is a medium crystallization risk. For example, if the processing equipment determines that the timing time is 40 hours at a certain moment, which is greater than 35 hours and less than 50 hours, the processing equipment can determine the crystallization degree of the mixer as a medium crystallization risk.

[0076] When the timing time is greater than or equal to the third time threshold, it can be understood that a large amount of crystals have been generated in the mixer. The crystals have greatly affected the actual operation of the mixer, which means there is a high risk of crystallization. For example, if the processing device determines that the timing time is 60 hours at a certain moment, and 60 hours is greater than 50 hours, the processing device can determine the crystallization degree of the mixer as a high risk of crystallization.

[0077] In one possible implementation, the timing can be displayed using a timer, allowing the driver to observe the time in real time. Indicator lights can indicate the corresponding crystallization risk; for example, an off indicator light indicates no crystallization risk, green indicates low crystallization risk, yellow indicates medium crystallization risk, and red indicates high crystallization risk.

[0078] The method provided in this application determines the degree of crystallization in a vehicle's mixer by combining data on the exhaust gas flow rate, mixer temperature, and urea injection quantity into the mixer with a timing interval. This method sets a urea injection quantity threshold, derived from the exhaust gas flow rate and temperature. Different flow rates and temperatures correspond to different urea injection quantity thresholds. By setting this threshold, the method determines whether crystallization will occur in different mixers under different operating conditions. Whether crystallization occurs is reflected by the timing interval. Furthermore, this application considers the elimination of crystallization within the mixer. It sets corresponding conditions to reduce the timing interval, thereby representing the elimination of crystallization by the mixer. Finally, the degree of crystallization is determined by the timing interval. This application provides an accurate method for determining the degree of crystallization in a mixer. The method provided in this application can directly acquire data from the ECU and use the timing interval to reflect the degree of crystallization in the mixer. For the vehicle, no additional components or significant modifications are required, making it easy to implement. The method provided in this application also specifically determines the crystallization risk inside the mixer by comparing the timing time and time threshold, thereby more specifically demonstrating the degree of crystallization risk, making it easier for the driver to observe and better determine when to clean the crystals inside the mixer.

[0079] In addition to determining the urea injection threshold in real time during vehicle operation, the urea injection threshold that may occur during vehicle operation can also be predetermined. In one possible implementation, multiple different exhaust gas flow rates and multiple different temperatures can be obtained.

[0080] Multiple different exhaust gas flow rates may occur during actual vehicle operation. For example, the actual exhaust gas flow rate range during vehicle operation might be 200-2500, then multiple different exhaust gas flow rates would be any number of different exhaust gas flow rates within the range of 200-2500; similarly, the temperature range of the vehicle's mixer during actual vehicle operation might be 180-500, then multiple different temperatures would be any number of different temperatures within the range of 180-500.

[0081] By using multiple different exhaust gas flow rates and multiple different temperatures as target exhaust gas flow rates, the target exhaust gas flow rate can be determined first, for example, 200. Then, using the crystallization boundary experiment provided in S102, the urea injection threshold for the target exhaust gas flow rate 200 at multiple different mixer temperatures can be determined. For example, the multiple different temperatures could be 180, 200, 220, 240, ..., 500. The urea injection threshold corresponding to the exhaust gas flow rate 200 at these temperatures can be determined experimentally. Given a fixed exhaust gas flow rate, there is a functional relationship between temperature and the urea injection threshold. This functional relationship can be used to determine the urea injection threshold at any temperature for the exhaust gas flow rate 200. After determining the urea injection threshold at different temperatures corresponding to an exhaust gas flow rate of 200, the above operation can be repeated with 220 as the target exhaust gas flow rate to obtain the urea injection threshold at different temperatures corresponding to an exhaust gas flow rate of 220. This process is repeated to obtain the urea injection threshold at different temperatures corresponding to exhaust gas flow rates of 200, 220, 240, 260, ..., 2500. Next, a target temperature can be determined, for example, 300. The urea injection threshold at the target temperature of 300 under multiple different exhaust gas flow rates can be determined using the crystallization boundary experiment provided in S102. For example, multiple different exhaust gas flow rates could be 200, 220, 240, ..., 2500. The urea injection threshold corresponding to temperature 300 under these exhaust gas flow rates can be determined experimentally. With a fixed temperature, there is also a functional relationship between the exhaust gas flow rate and the urea injection threshold. This functional relationship can be used to determine the urea injection threshold corresponding to any exhaust gas flow rate at temperature 300. By combining the two methods described above, the urea injection threshold corresponding to any combination of temperature range and exhaust gas flow range can be obtained. For example, by combining the two methods, the urea injection threshold at an exhaust gas flow rate of 568 and a temperature of 289 can be determined.

[0082] The results of the crystallization boundary experiment are stored in the vehicle. When the processing equipment obtains the exhaust gas flow rate and the temperature of the mixer, it can directly determine the urea injection threshold based on the results of the crystallization boundary experiment.

[0083] The method provided in this application determines the urea injection threshold corresponding to any exhaust gas flow rate and temperature within the range of working exhaust gas flow rate and temperature of the mixer through pre-conducted experiments. This speeds up the judgment time for increasing or decreasing the timing time, making the judgment of the degree of crystallization inside the mixer more accurate. Since real-time calculation is avoided, the computational burden on the vehicle is reduced.

[0084] This application also provides a method such as Figure 2 The diagram shows a structural schematic of a mixer crystallization degree determination device 200, which includes the following modules:

[0085] The acquisition module 201 is used to acquire the exhaust gas flow rate of the input mixer, the temperature of the mixer, and the amount of urea injected into the mixer;

[0086] The timing time increment module 202 is used to increase the timing time when the urea injection quantity is not less than the urea injection quantity threshold, wherein the urea injection quantity threshold is obtained using the exhaust gas flow rate and the temperature.

[0087] The timing reduction module 203 is used to reduce the timing time when the temperature is greater than a preset temperature and the urea injection amount of the mixer is less than a preset urea injection amount. The preset urea injection amount is obtained using the urea injection amount threshold.

[0088] Crystallization degree judgment module 204 is used to obtain the crystallization degree judgment result of the mixer using the timing time.

[0089] In one possible implementation, the urea injection volume threshold is obtained through the following module:

[0090] A mixer experimental module is used to input the waste gas flow rate into the mixer at the temperature and continuously inject urea into the mixer;

[0091] The urea injection volume threshold determination module is used to stop injecting urea into the mixer when crystallization occurs in the mixer, and to use the total amount of urea injected into the mixer as the urea injection volume threshold.

[0092] In one possible implementation, the device further includes:

[0093] The experimental data acquisition module is used to acquire multiple different exhaust gas flow rates and multiple different temperatures, and to take the multiple different exhaust gas flow rates as target exhaust gas flow rates and the multiple different temperatures as target temperatures.

[0094] The mixer target condition experimental module is used to input the target exhaust gas flow rate into the mixer at the target temperature and continuously inject urea into the mixer;

[0095] The target urea injection quantity threshold determination module is used to stop injecting urea into the mixer when crystallization occurs in the mixer, and to use the amount of urea injected into the mixer as the target exhaust gas flow rate and the urea injection quantity threshold at the target temperature.

[0096] In one possible implementation, the crystallinity determination module includes:

[0097] A no-crystallization-risk determination unit is used to determine the crystallization degree judgment result of the mixer as having no crystallization risk when the timing time is less than a first time threshold.

[0098] A low crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as low crystallization risk when the timing time is greater than or equal to a first time threshold and less than a second time threshold.

[0099] The medium crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as medium crystallization risk when the timing time is greater than or equal to the second time threshold and less than the third time threshold;

[0100] A high crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as high crystallization risk when the timing time is greater than or equal to a third time threshold.

[0101] This application also provides a device for determining the degree of crystallization of a mixer, wherein the device includes a memory and a processor, the memory is used to store instructions or code, and the processor is used to execute the instructions or code to cause the device to perform the steps of the method for determining the degree of crystallization of a mixer as described in any embodiment of this application.

[0102] In practical applications, the computer-readable storage medium can be any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium.

[0103] Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0104] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of sending, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0105] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0106] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0107] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components indicated 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 solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0108] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for determining the degree of crystallization in a mixer, characterized in that, include: The exhaust gas flow rate into the mixer, the temperature of the mixer, and the amount of urea injected into the mixer are obtained. When the urea injection quantity is not less than the urea injection quantity threshold, the timing time is increased. The urea injection quantity threshold is obtained using the exhaust gas flow rate and the temperature. When the temperature is greater than the preset temperature and the urea injection amount of the mixer is less than the preset urea injection amount, the timing time is reduced. The preset urea injection amount is obtained using the urea injection amount threshold. The degree of crystallization of the mixer is determined by using the timing time. The urea injection volume threshold is obtained through the following method: The waste gas flow rate is input into the mixer at the specified temperature, and urea is continuously injected into the mixer; When crystallization occurs in the mixer, the injection of urea into the mixer is stopped, and the total amount of urea injected into the mixer is used as the urea injection amount threshold; the timing time is used to indicate the time for crystallization to occur in the mixer.

2. The method according to claim 1, characterized in that, The method further includes: Multiple different exhaust gas flow rates and multiple different temperatures are obtained, and the multiple different exhaust gas flow rates are respectively used as target exhaust gas flow rates, and the multiple different temperatures are respectively used as target temperatures; The target exhaust gas flow rate is input into a mixer at the target temperature and urea is continuously injected into the mixer; When crystallization occurs in the mixer, the injection of urea into the mixer is stopped, and the amount of urea injected into the mixer is used as the threshold for the urea injection amount at the target exhaust gas flow rate and the target temperature.

3. The method according to claim 1, characterized in that, The determination of the degree of crystallization of the mixer using the timing includes: When the timing time is less than the first time threshold, the crystallization degree judgment result of the mixer is determined to be no risk of crystallization. When the timing time is greater than or equal to the first time threshold and less than the second time threshold, the crystallization degree judgment result of the mixer is determined to be low crystallization risk; When the timing time is greater than or equal to the second time threshold and less than the third time threshold, the crystallization degree judgment result of the mixer is determined to be of medium crystallization risk; When the timing time is greater than or equal to the third time threshold, the crystallization degree judgment result of the mixer is determined to be of high crystallization risk.

4. A device for determining the degree of crystallization in a mixer, characterized in that, include: The acquisition module is used to acquire the exhaust gas flow rate of the input mixer, the temperature of the mixer, and the amount of urea injected into the mixer; The timing time increment module is used to increase the timing time when the urea injection quantity is not less than the urea injection quantity threshold, wherein the urea injection quantity threshold is obtained using the exhaust gas flow rate and the temperature. A timing reduction module is used to reduce the timing time when the temperature is greater than a preset temperature and the urea injection quantity of the mixer is less than a preset urea injection quantity, wherein the preset urea injection quantity is obtained using the urea injection quantity threshold. A crystallization degree judgment module is used to obtain the crystallization degree judgment result of the mixer using the timing time; The urea injection volume threshold is obtained through the following module: A mixer experimental module is used to input the waste gas flow rate into the mixer at the temperature and continuously inject urea into the mixer; The urea injection volume threshold determination module is used to stop injecting urea into the mixer when crystals are generated in the mixer, and to use the total amount of urea injected into the mixer as the urea injection volume threshold; the timing time is used to represent the time when crystals are generated in the mixer.

5. The apparatus according to claim 4, characterized in that, The device further includes: The experimental data acquisition module is used to acquire multiple different exhaust gas flow rates and multiple different temperatures, and to take the multiple different exhaust gas flow rates as target exhaust gas flow rates and the multiple different temperatures as target temperatures. The mixer target condition experimental module is used to input the target exhaust gas flow rate into the mixer at the target temperature and continuously inject urea into the mixer; The target urea injection quantity threshold determination module is used to stop injecting urea into the mixer when crystallization occurs in the mixer, and to use the amount of urea injected into the mixer as the target exhaust gas flow rate and the urea injection quantity threshold at the target temperature.

6. The apparatus according to claim 4, characterized in that, The crystallization degree determination module includes: A no-crystallization-risk determination unit is used to determine the crystallization degree judgment result of the mixer as having no crystallization risk when the timing time is less than a first time threshold. A low crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as low crystallization risk when the timing time is greater than or equal to a first time threshold and less than a second time threshold. The medium crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as medium crystallization risk when the timing time is greater than or equal to the second time threshold and less than the third time threshold; A high crystallization risk determination unit is used to determine the crystallization degree judgment result of the mixer as high crystallization risk when the timing time is greater than or equal to a third time threshold.

7. An electronic device, characterized in that, Includes memory and processor, wherein: The memory is used to store computer programs; The processor is configured to execute the computer program to implement the method for determining the degree of crystallization of the mixer as described in any one of claims 1-3.

8. A computer-readable storage medium, characterized in that, Used to store a computer program, wherein the computer program, when executed by a processor, implements the method for determining the degree of crystallization of a mixer as described in any one of claims 1-3.

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