Reductant supply control method, SCR system, electronic device and storage medium

Abstract

The present invention provides a control method for reducing agent supply, an SCR system, an electronic device and a storage medium, the method comprising obtaining the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system, and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reducing agent supply conversion rate correction value; obtaining the outlet reducing agent escape value of the SCR system, and calculating according to the reducing agent escape threshold and the real-time escape value to obtain the reducing agent escape value correction value; determining the optimal supply amount of the reducing agent according to the reducing agent supply conversion rate correction value, the reducing agent escape value correction value and a preset MAP reference value. The present invention makes the reducing agent supply amount more accurate, ensuring that a better NOx conversion effect can be achieved under any working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of SCR denitration, and in particular to a reducing agent supply control method, an SCR system, an electronic device and a storage medium. Background Art

[0002] SCR denitrification (Selective Catalytic Reduction, referred to as SCR), that is, selective catalytic reduction denitrification technology, also known as ammonia catalytic reduction denitrification, is to inject ammonia or other suitable reducing agents into the flue gas, and use catalysts (such as alkali metals such as iron, vanadium, chromium, cobalt or molybdenum) to convert NOx in the flue gas into nitrogen and water at a temperature of 200-450°C.

[0003] However, when the engine is in different working conditions, the concentration of NOx components in the exhaust gas is different. When the reducing agent supply is insufficient, NOx cannot be effectively converted into nitrogen and water, causing pollutant emissions to exceed the standard. When the reducing agent supply is too much, the part that does not react with NOx releases NH3, which is toxic and harmful gas. Therefore, it is necessary to provide an appropriate reducing agent supply under different working conditions to ensure the full conversion of NOx. Summary of the invention

[0004] The present invention provides a reducing agent supply control method, an SCR system, an electronic device and a storage medium, which are used to solve the problem of insufficient conversion of NOx in the prior art.

[0005] In a first aspect, the present invention provides a method for controlling the supply of a reducing agent, comprising:

[0006] Acquiring the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system, and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction amount;

[0007] Obtaining an outlet reducing agent escape value of the SCR system, and calculating according to the reducing agent escape threshold and the real-time escape value to obtain a reducing agent escape value correction amount;

[0008] The optimal supply amount of the reducing agent is determined according to the reducing agent supply conversion rate correction amount, the reducing agent escape value correction amount and a preset MAP reference value.

[0009] In one embodiment of the present invention, the step of obtaining the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction value comprises:

[0010] Acquiring the concentration value of the nitrogen oxides through a first sensor, and acquiring the concentration value of the nitrogen oxides through a second sensor;

[0011] The real-time conversion rate is obtained according to the following calculation formula:

[0012] C1=(N1-N2) / N1×100%;

[0013] Wherein, C1 represents the real-time conversion rate, N1 represents the concentration value of nitrogen oxides obtained by the first sensor, and N2 represents the concentration value of nitrogen oxides obtained by the second sensor.

[0014] In one embodiment of the present invention, the step of obtaining the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction value further includes:

[0015] The reductant supply conversion rate correction amount is obtained according to the following calculation formula:

[0016] A1=K1×(C0-C1);

[0017] Wherein, A1 represents the reducing agent supply conversion rate correction amount, C0 represents the expected conversion rate, and K1 represents the correction coefficient, which is a positive number.

[0018] In one embodiment of the present invention, the step of obtaining the outlet reducing agent escape value of the SCR system and calculating the reducing agent escape value correction amount according to the reducing agent escape threshold and the real-time escape value comprises:

[0019] acquiring the reducing agent escape value through a third sensor;

[0020] The reducing agent escape value correction amount is obtained according to the following calculation formula:

[0021] When N>N0, A2=-K2×(N-N0);

[0022] When N≤N0, A2=0;

[0023] Wherein, A2 represents the reducing agent escape value correction amount, N represents the reducing agent escape value, N0 represents the reducing agent escape threshold, and K2 represents the correction coefficient, which is a positive number.

[0024] In one embodiment of the present invention, the step of determining the optimal supply amount of the reducing agent according to the reducing agent supply conversion rate correction amount, the reducing agent escape value correction amount and a preset MAP reference value includes:

[0025] The optimal supply amount of the reducing agent is obtained according to the following calculation formula:

[0026] S = M + A1 + A2;

[0027] Wherein, S represents the optimal supply amount of reducing agent, and M represents the reference value of the MAP map.

[0028] In one embodiment of the present invention, after the step of determining the optimal supply amount of the reducing agent, the method further includes:

[0029] When the values ​​of A1 and A2 are continuously greater than the MAP reference value M of the first preset multiple within the preset time period, an alarm message is sent to the SCR system to report the abnormality of the reducing agent supply;

[0030] When the values ​​of A1 and A2 are continuously greater than the second preset multiple of the MAP reference value M within the preset time period, an alarm shutdown message is sent to the SCR system to report the abnormal shutdown of the reducing agent supply.

[0031] In a second aspect, the present invention further provides an SCR system, the system comprising:

[0032] A sensor module, comprising a first sensor, a second sensor and a third sensor, wherein the first sensor is used to obtain a concentration value of inlet nitrogen oxides, the second sensor is used to obtain a concentration value of outlet nitrogen oxides, and the third sensor is used to obtain an outlet reducing agent escape value;

[0033] A calculation module is used to calculate according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction amount, and to calculate according to the reductant escape threshold and the real-time escape value to obtain the reductant escape value correction amount, and to determine the optimal supply amount of the reductant according to the reductant supply conversion rate correction amount, the reductant escape value correction amount and the MAP diagram reference value.

[0034] In one embodiment of the present invention, the calculation module further includes a reducing agent supply setting value register, and the reducing agent supply setting value register is used to store the optimal supply amount of the reducing agent.

[0035] In one embodiment of the present invention, the system further comprises a reducing agent supply execution module, which is used to perform PID control on the optimal supply amount of the reducing agent to ensure that the optimal supply amount of the reducing agent is within a preset multiple range of the MAP reference value.

[0036] In a third aspect, the present invention further provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the reducing agent supply control method as described in any one of the first aspects are implemented.

[0037] In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the reducing agent supply control method as described in any one of the first aspects.

[0038] The control method for reducing agent supply, SCR system, electronic device and storage medium provided by the present invention collect the inlet nitrogen oxide concentration value, outlet nitrogen oxide concentration value and outlet reducing agent escape value of the SCR system, and comprehensively consider the MAP diagram reference value obtained from the bench test, so as to calculate the real-time optimal reducing agent supply amount, so as to solve the problem that the MAP diagram guides the SCR reducing agent supply amount to have deviation, the feedback regulation is easy to cause large fluctuations in the supply amount, and the conversion efficiency of the SCR system does not meet the standard or the reducing agent escape exceeds the standard, so that the reducing agent supply amount is more accurate, and it is ensured that the better NOx conversion effect can be achieved under any working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a flow chart of a method for controlling the supply of a reducing agent provided by the present invention;

[0041] Figure 2 is a flow chart of a reducing agent supply control method provided by an embodiment of the present invention;

[0042] Figure 3 It is a structural schematic diagram of the SCR system provided by the present invention;

[0043] Figure 4 is a schematic structural diagram of an SCR system provided by an embodiment of the present invention;

[0044] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0047] In order to solve the problem of insufficient conversion of NOx in the prior art, the control method for reducing agent supply, SCR system, electronic device and storage medium provided by the present invention collect the inlet nitrogen oxide concentration value, outlet nitrogen oxide concentration value and outlet reducing agent escape value of the SCR system, and combine the MAP diagram reference value obtained from the bench test to calculate the real-time optimal reducing agent supply amount, so that the reducing agent supply amount is more accurate, ensuring that a better NOx conversion effect can be achieved under any operating conditions.

[0048] Combine the following Figure 1-Figure 5 The present invention describes a reducing agent supply control method, an SCR system, an electronic device, and a storage medium.

[0049] Please refer to Figure 1 , Figure 1 The flowchart of the reducing agent supply control method provided by the present invention is a reducing agent supply control method, the method comprising:

[0050] Step 110 , obtaining the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system, and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction amount.

[0051] Exemplarily, the nitrogen oxide is NOx, such as nitric oxide NO.

[0052] Step 120 , obtaining the outlet reducing agent escape value of the SCR system, and calculating according to the reducing agent escape threshold and the real-time escape value to obtain the reducing agent escape value correction amount.

[0053] Exemplarily, the reducing agent may be ammonia (NH 3 ). For example, ammonia slip refers to the presence of ammonia that does not participate in the reaction in the flue gas at the outlet of the denitrification reactor.

[0054] Step 130 : determining the optimal supply amount of the reducing agent according to the reducing agent supply conversion rate correction amount, the reducing agent escape value correction amount and a preset MAP reference value.

[0055] It should be noted that the existing technology is to test the main operating points of the engine during the bench test phase to obtain the appropriate reductant supply amount, and then form a MAP diagram to guide the reductant supply amount based on the obtained several operating points fitting curves. This method is relatively simple, and it cannot guarantee that the reductant supply amount can achieve a better NOx conversion effect under all operating conditions. In addition, as the service life of the engine increases, the components of the exhaust gas and the catalyst efficiency change, and the denitrification conversion rate of the SCR system is difficult to guarantee.

[0056] Therefore, the prior art only uses the guidance of the MAP diagram, and only tests several main operating points of the bench test to determine the supply amount of the reducing agent, which cannot guarantee that the conversion rate under all operating conditions in the entire life cycle of the engine can achieve a better effect. However, the present invention, under the guidance of the MAP diagram, determines the optimal supply amount of the reducing agent through relevant calculations, thereby achieving precise control of the supply amount of the reducing agent and improving the denitration conversion rate of the SCR system.

[0057] The above steps 110 to 130 are described in detail below through an embodiment.

[0058] Please refer to Figure 2 , Figure 2 It is a flow chart of a method for controlling the supply of a reducing agent provided in an embodiment of the present invention.

[0059] Exemplarily, in the above step 110, the step of obtaining the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction value includes:

[0060] Step 111, obtaining the NOx concentration value N1 through the first sensor. The first sensor refers to a NOx sensor installed at the front end of the reactor.

[0061] Step 112, obtaining the NOx concentration value N2 through the second sensor. The second sensor is a NOx sensor installed at the rear end of the reactor.

[0062] Step 113, obtaining the real-time conversion rate according to the following calculation formula:

[0063] C1=(N1-N2) / N1×100%;

[0064] Wherein, C1 represents the real-time conversion rate, N1 represents the NOx concentration value obtained by the first sensor, and N2 represents the NOx concentration value obtained by the second sensor.

[0065] Step 114, obtaining the reductant supply conversion rate correction amount according to the following calculation formula:

[0066] A1=K1×(C0-C1);

[0067] Wherein, A1 represents the reducing agent supply conversion rate correction amount, C0 represents the expected conversion rate, and K1 represents the correction coefficient, which is a positive number.

[0068] For example, the expected conversion rate C0 of the SCR system may be obtained according to the original emission value of the engine and the emission requirements of relevant laws and regulations.

[0069] In the above formula, when the real-time conversion rate C1 is less than the expected conversion rate C0, it means that the denitrification reaction is insufficient and the reducing agent supply is insufficient. The reducing agent supply needs to be increased, and the conversion rate correction amount A1 is a positive number; when the real-time conversion rate C1 is greater than the expected conversion rate C0, it means that the denitrification reaction is sufficient and the reducing agent supply is excessive. In order to prevent ammonia slip from exceeding the standard, the reducing agent supply needs to be reduced, and the conversion rate correction amount A1 is a negative number.

[0070] Exemplarily, in the above step 120, the step of obtaining the outlet reducing agent escape value of the SCR system and calculating according to the reducing agent escape threshold and the real-time escape value to obtain the reducing agent escape value correction value includes:

[0071] Step 121, obtaining the escape value of the reducing agent (such as ammonia) through a third sensor. The third sensor is a NOx sensor installed at the rear end of the reactor.

[0072] Step 122, obtaining the reducing agent escape value correction amount according to the following calculation formula:

[0073] When N>N0, A2=-K2×(N-N0);

[0074] When N≤N0, A2=0;

[0075] Wherein, A2 represents the reducing agent escape value correction amount, N represents the reducing agent escape value, N0 represents the reducing agent escape threshold, and K2 represents the correction coefficient, which is a positive number.

[0076] For example, according to relevant regulatory requirements, a reductant escape value threshold value N0 of the SCR system may be obtained.

[0077] In the above formula, when the ammonia escape value N exceeds the escape threshold value N0, it means that the reducing agent supply is too high, and the excess part cannot participate in the denitrification reaction, resulting in excessive ammonia escape. It is necessary to correct and reduce the supply amount, and the correction coefficient K2 is a negative number; when the ammonia escape value N does not exceed the escape threshold value N0, it means that there is no excess reducing agent supply, and there is no need to correct the reducing agent supply. At this time, reducing the reducing agent supply may lead to insufficient conversion rate.

[0078] It should be noted that the above correction coefficients K1 and K2 are obtained by theoretical calculation. The correction coefficients are calculated according to different models and original displacement engines, and a database is established. When the database reaches a certain scale, the correction coefficients K1 and K2 can be obtained by selecting values ​​or differences in the database.

[0079] Exemplarily, in the above step 130, the step of determining the optimal supply amount of the reducing agent according to the reducing agent supply conversion rate correction amount, the reducing agent escape value correction amount and the MAP map reference value includes:

[0080] Step 131, obtaining the optimal supply amount of the reducing agent according to the following calculation formula:

[0081] S = M + A1 + A2;

[0082] Wherein, S represents the optimal supply amount of reducing agent, and M represents the reference value of the MAP map.

[0083] It should be noted that the MAP map reference value M is used as a reference parameter for calculating the optimal supply amount. When the values ​​of A1 and A2 are continuously greater than the first preset multiple (for example, 0.2 times) of the MAP map reference value M within a preset time period, an alarm message is sent to the SCR system to report that the reductant supply is abnormal. When the values ​​of A1 and A2 are continuously greater than the second preset multiple (for example, 0.4 times) of the MAP map reference value M within a preset time period, an alarm shutdown message is sent to the SCR system to report that the reductant supply is abnormal and the system is shut down.

[0084] The SCR system provided by the present invention is described below. The SCR system described below and the reducing agent supply control method described above can be referred to each other.

[0085] See also Figure 3 , Figure 3 Schematic diagram of the structure of the SCR system provided by the present invention. An SCR system, the SCR system 310 includes a sensor module 311 and a calculation module 312 .

[0086] Exemplarily, the sensor module 311 includes a first sensor, a second sensor and a third sensor, wherein the first sensor is used to obtain an inlet nitrogen oxide concentration value, the second sensor is used to obtain an outlet nitrogen oxide concentration value, and the third sensor is used to obtain an outlet reductant slip value.

[0087] Exemplarily, the calculation module 312 is used to calculate according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction amount, and to calculate according to the reductant escape threshold and the real-time escape value to obtain the reductant escape value correction amount, and to determine the optimal supply amount of the reductant according to the reductant supply conversion rate correction amount, the reductant escape value correction amount and the MAP diagram reference value.

[0088] Exemplarily, the calculation module 312 is further used for:

[0089] The real-time conversion rate is obtained according to the following calculation formula:

[0090] C1=(N1-N2) / N1×100%;

[0091] Wherein, C1 represents the real-time conversion rate, N1 represents the concentration value of nitrogen oxides obtained by the first sensor, and N2 represents the concentration value of nitrogen oxides obtained by the second sensor.

[0092] Exemplarily, the calculation module 312 is further used for:

[0093] The reductant supply conversion rate correction amount is obtained according to the following calculation formula:

[0094] A1=K1×(C0-C1);

[0095] Wherein, A1 represents the reducing agent supply conversion rate correction amount, C0 represents the expected conversion rate, and K1 represents the correction coefficient, which is a positive number.

[0096] Exemplarily, the calculation module 312 is further used for:

[0097] The reducing agent escape value correction amount is obtained according to the following calculation formula:

[0098] When N>N0, A2=-K2×(N-N0);

[0099] When N≤N0, A2=0;

[0100] Wherein, A2 represents the reducing agent escape value correction amount, N represents the reducing agent escape value, N0 represents the reducing agent escape threshold, and K2 represents the correction coefficient, which is a positive number.

[0101] Exemplarily, the calculation module 312 is further used for:

[0102] The optimal supply amount of the reducing agent is obtained according to the following calculation formula:

[0103] S = M + A1 + A2;

[0104] Wherein, S represents the optimal supply amount of reducing agent, and M represents the reference value of the MAP map.

[0105] Exemplarily, the SCR system 310 further includes an alarm unit, which is used to:

[0106] When the values ​​of A1 and A2 are continuously greater than the MAP reference value M of the first preset multiple within the preset time period, an alarm message is sent to the SCR system to report the abnormality of the reducing agent supply;

[0107] When the values ​​of A1 and A2 are continuously greater than the second preset multiple of the MAP reference value M within the preset time period, an alarm shutdown message is sent to the SCR system to report the abnormal shutdown of the reducing agent supply.

[0108] Exemplarily, the calculation module 312 further includes a reducing agent supply setting value register, and the reducing agent supply setting value register is used to store the optimal supply amount of the reducing agent.

[0109] Exemplarily, the system further comprises a reducing agent supply execution module, which is used to perform PID control on the optimal supply amount of the reducing agent to ensure that the optimal supply amount of the reducing agent is within a preset multiple range of the MAP reference value.

[0110] Please participate Figure 4 , Figure 4 3 is a schematic diagram of the structure of an SCR system provided by an embodiment of the present invention. An SCR system 310 includes a sensor module 311 , a calculation module 312 and a reducing agent supply execution module 313 .

[0111] Exemplarily, the sensor module 311 includes a front-end NOx sensor 3111 , a rear-end NOx sensor 3112 , and a rear-end NH3 sensor 3113 .

[0112] Exemplarily, the calculation module 312 includes an analysis and calculation device 3121 and a reducing agent supply set value register 3122 .

[0113] Exemplarily, the reductant supply execution module 313 includes a reductant supply unit controller 3131 .

[0114] The following is a detailed description of each of the above modules.

[0115] Exemplarily, the sensor module 311 measures the concentration value N1 at the front end of the reactor by the NOx sensor 3111, and measures the concentration value N2 at the rear end by the NOx sensor 3112, and calculates the real-time conversion rate C1 (the real-time conversion rate C1 is used as one of the parameters of regulation) by the following formula in the analysis and calculation device 3121:

[0116] C1 = (N1 - N2) / N1 x 100%.

[0117] Furthermore, according to the original emission value of the engine and the emission requirements of relevant laws and regulations, the expected conversion rate C0 of the SCR system can be obtained, and the relationship between the conversion rate deviation and the reductant supply conversion rate correction amount A1 is established, and the analysis and calculation device 3121 calculates by the following formula:

[0118] A1=K1×(C0-C1), where K1 is the correction coefficient, which is a positive number.

[0119] When the real-time conversion rate C1 is less than the expected conversion rate C0, it means that the denitrification reaction is insufficient and the reducing agent supply is insufficient, and the reducing agent supply needs to be increased, so the reducing agent supply conversion rate correction amount A1 is a positive number; when the real-time conversion rate C1 is greater than the expected conversion rate C0, it means that the denitrification reaction is sufficient and the reducing agent supply is excessive. In order to prevent ammonia slip from exceeding the standard, the reducing agent supply needs to be reduced, so the reducing agent supply conversion rate correction amount A1 is a negative number.

[0120] For example, the sensor module 311 measures the ammonia slip value N in real time at the NH3 sensor 3113 at the rear end of the reactor. According to relevant regulations, the ammonia slip threshold value N0 of the SCR system can be obtained. The relationship between the ammonia slip deviation and the reductant supply conversion rate correction amount A2 is established, and the analysis and calculation device 3121 calculates by the following formula:

[0121] When N>N0, A2=-K2×(N-N0); when N≤N0, A2=0. K2 is the correction coefficient, which is a positive number.

[0122] When the ammonia escape value N exceeds the ammonia escape threshold value N0, it means that the reducing agent supply is too high, and the excess part cannot participate in the denitrification reaction, resulting in excessive ammonia escape. It is necessary to correct and reduce the supply amount, and the correction amount K2 is a negative number; when the ammonia escape value N does not exceed the ammonia escape threshold value N0, it means that there is no excess reducing agent supply, and there is no need to correct the reducing agent supply. At this time, reducing the reducing agent supply may result in insufficient conversion rate.

[0123] The above correction coefficients K1 and K2 are obtained by theoretical calculation. The correction coefficients are calculated according to different models and original displacement engines, and a database is established. When the database reaches a certain scale, the correction coefficients K1 and K2 can be obtained by selecting values ​​or differences in the database.

[0124] Exemplarily, the MAP map reference value M is used as the required reference parameter for calculation, and the calculation formula for calculating the optimal supply amount S of the reducing agent in the analysis and calculation device 3121 is as follows:

[0125] S=M+A1+A2.

[0126] It should be noted that the above calculation of the optimal supply amount S is performed in the analysis and calculation device 3121, and the input variables are: MAP map reference value M, concentration value N1 measured by the front-end NOx sensor, concentration value N2 measured by the rear-end NOx sensor, and concentration value (or ammonia slip value) N measured by the rear-end NH3 sensor. The input quantity is the expected conversion rate C0 of the SCR system and the ammonia slip threshold value N0 of the SCR system. The output is the optimal supply amount S of the reducing agent.

[0127] Exemplarily, the correction values ​​A1 and A2 obtained by the analysis and calculation device 3121 are stored in the reductant supply setting value register 3122. When the values ​​of A1 and A2 are continuously greater than the MAP map reference value M of the first preset multiple (for example, 0.2 times) for a certain period of time, the analysis and calculation device 3121 sends an alarm message to the SCR system to report the abnormal reductant supply. When the values ​​of A1 and A2 are continuously greater than the MAP map reference value M of the second preset multiple (for example, 0.4 times) for a certain period of time, the analysis and calculation device 3121 sends an alarm shutdown message to the SCR system to report the abnormal reductant supply shutdown.

[0128] Exemplarily, the optimal supply amount S of the reductant is stored in the reductant supply setting value register 3122, and the reductant supply setting value register 3122 sends the optimal supply amount S of the reductant to the reductant supply unit controller 3131 to perform PID (PID is the abbreviation of proportional, integral, and differential) control, but the reductant supply unit controller 3131 adjusts the optimal supply amount S of the reductant to be near the MAP map reference value M. For example, the optimal supply amount S of the reductant can be adjusted to be within a preset multiple (for example, less than 0.2 times) of the MAP map reference value M.

[0129] It should be noted here that the above-mentioned SCR system provided in the embodiment of the present invention can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0130] Figure 5 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 5 As shown, the electronic device may include: a processor (Processor) 510, a communication interface (Communications Interface) 520, a memory (Memory) 530 and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logic instructions in the memory 530 to execute the control method of the reducing agent supply, and the method includes:

[0131] Acquiring the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system, and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction amount;

[0132] Obtaining an outlet reducing agent escape value of the SCR system, and calculating according to the reducing agent escape threshold and the real-time escape value to obtain a reducing agent escape value correction amount;

[0133] The optimal supply amount of the reducing agent is determined according to the reducing agent supply conversion rate correction amount, the reducing agent escape value correction amount and a MAP reference value.

[0134] In addition, the logic instructions in the above-mentioned memory 530 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computing device (which can be a programmable logic controller, an integrated circuit, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0135] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the control method of the reductant supply provided by the above-mentioned methods.

[0136] In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to perform the above-mentioned reducing agent supply control method.

[0137] An embodiment of the present invention provides an electronic device, a computer program product, and a processor-readable storage medium, on which the computer program stored enables the processor to implement all the method steps implemented by the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those of the method embodiment will not be described in detail here.

[0138] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0139] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the supply of a reducing agent, It is characterized in that The method comprises: The concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system are obtained, and the reductant supply conversion rate correction amount is obtained by calculation according to the real-time conversion rate and the expected conversion rate; wherein the reductant supply conversion rate correction amount is calculated by the following formula: A1=K1×(C0-C1); Wherein, A1 represents the reductant supply conversion rate correction amount, C0 represents the expected conversion rate, K1 represents the correction coefficient, which is a positive number, C1 represents the real-time conversion rate, C1=(N1-N2) / N1×100%, N1 represents the inlet nitrogen oxide concentration value, and N2 represents the outlet nitrogen oxide concentration value; The outlet reductant escape value of the SCR system is obtained, and the reductant escape value correction amount is obtained by calculation according to the reductant escape threshold value and the real-time escape value; wherein the reductant escape value correction amount is calculated by the following formula: When N>N0, A2=-K2×(N-N0); When N≤N0, A2=0; Wherein, A2 represents the reducing agent escape value correction amount, N represents the reducing agent escape value, N0 represents the reducing agent escape threshold, and K2 represents the correction coefficient, which is a positive number; The optimal supply amount of the reducing agent is determined according to the reducing agent supply conversion rate correction amount, the reducing agent escape value correction amount and a preset MAP reference value; wherein the optimal supply amount is calculated by the following formula: S = M + A1 + A2; Wherein, S represents the optimal supply amount of reducing agent, and M represents the reference value of the MAP map.

2. The reducing agent supply control method according to claim 1, It is characterized in that The step of obtaining the concentration values ​​of nitrogen oxides at the inlet and outlet of the SCR system and calculating according to the real-time conversion rate and the expected conversion rate to obtain the reductant supply conversion rate correction value comprises: The concentration value of the nitrogen oxides is obtained by a first sensor, and the concentration value of the nitrogen oxides is obtained by a second sensor.

3. The reducing agent supply control method according to claim 1, It is characterized in that The step of obtaining the outlet reductant slip value of the SCR system comprises: The reducing agent slip value is acquired by a third sensor.

4. The reducing agent supply control method according to claim 1, It is characterized in that After the step of determining the optimal supply amount of the reducing agent, the method further includes: When the values ​​of A1 and A2 are continuously greater than the MAP reference value M of the first preset multiple within the preset time period, an alarm message is sent to the SCR system to report the abnormality of the reducing agent supply; When the values ​​of A1 and A2 are continuously greater than the second preset multiple of the MAP reference value M within the preset time period, an alarm shutdown message is sent to the SCR system; The second preset multiple is greater than the first preset multiple.

5. An SCR system, It is characterized in that The system comprises: A sensor module, comprising a first sensor, a second sensor and a third sensor, wherein the first sensor is used to obtain a concentration value of inlet nitrogen oxides, the second sensor is used to obtain a concentration value of outlet nitrogen oxides, and the third sensor is used to obtain an outlet reducing agent escape value; The calculation module is used to calculate according to the real-time conversion rate and the expected conversion rate to obtain a reductant supply conversion rate correction amount, wherein the reductant supply conversion rate correction amount is calculated by the following formula: A1=K1×(C0-C1); Wherein, A1 represents the reductant supply conversion rate correction amount, C0 represents the expected conversion rate, K1 represents the correction coefficient, which is a positive number, C1 represents the real-time conversion rate, C1=(N1-N2) / N1×100%, N1 represents the concentration value of the inlet nitrogen oxides, and N2 represents the concentration value of the outlet nitrogen oxides; and is used to calculate according to the reductant escape threshold value and the real-time escape value to obtain the reductant escape value correction amount, wherein the reductant escape value correction amount is calculated by the following formula: When N>N0, A2=-K2×(N-N0); When N≤N0, A2=0; Wherein, A2 represents the reducing agent escape value correction amount, N represents the reducing agent escape value, N0 represents the reducing agent escape threshold value, K2 represents the correction coefficient, which is a positive number; and is used to determine the optimal supply amount of the reducing agent according to the reducing agent supply conversion rate correction amount, the reducing agent escape value correction amount and the MAP map reference value, wherein the optimal supply amount is calculated by the following formula: S = M + A1 + A2; Wherein, S represents the optimal supply amount of reducing agent, and M represents the reference value of the MAP map.

6. The SCR system according to claim 5, It is characterized in that The calculation module further includes a reducing agent supply setting value register, and the reducing agent supply setting value register is used to store the optimal supply amount of the reducing agent.

7. The SCR system according to claim 5, It is characterized in that The system further includes a reducing agent supply execution module, which is used to perform PID control on the optimal supply amount of the reducing agent to ensure that the optimal supply amount of the reducing agent is within a preset multiple range of the MAP reference value.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the program, the steps of the reducing agent supply control method according to any one of claims 1 to 4 are implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, It is characterized in that When the computer program is executed by a processor, the steps of the reducing agent supply control method according to any one of claims 1 to 4 are implemented.

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