Adjustable post-processing mixer control method, device and equipment and storage medium

Abstract

The invention discloses an adjustable post-treatment mixer control method, device and equipment and a storage medium, and relates to the technical field of post-treatment SCR (selective catalytic reduction) control, the method comprises the following steps: acquiring a basic value, an upper limit value and a lower limit value of an included angle between a swirl vane and an airflow axis, and obtaining a first correction coefficient of the included angle based on a urea injection amount and an exhaust flow; the crystallization degree of the post-processing mixer is obtained through judgment on the basis of the DPF post pressure and the exhaust flow, so that a second correction coefficient of the included angle is obtained; counting an average value of downstream NOx in a set time period, and obtaining a third correction coefficient of the included angle based on the average value; based on the basic value of the included angle, the first correction coefficient, the second correction coefficient, the third correction coefficient and the upper and lower limit values of the included angle, a final included angle value is obtained through calculation, and post-processing mixer control is achieved. According to the application, the adjustable post-treatment mixer can be effectively controlled.

Description

Technical Field

[0001] The present application relates to the technical field of post-processing SCR (Selective Catalytic Reduction) control, and in particular to an adjustable post-processing mixer control method, device, equipment and storage medium. Background Art

[0002] The post-treatment mixer is a device used to enhance the mixing uniformity of urea and exhaust gas, reduce NOx (nitrogen oxide) emissions and avoid urea crystal blockage.

[0003] For the aftertreatment mixer with fixed swirl blades, it cannot be adjusted with the engine and aftertreatment conditions to achieve the best performance under all conditions. Usually, the mixer structure is designed to be relatively complex, and the angle between the swirl blade and the airflow axis is increased, so as to enhance the urea mixing uniformity under small exhaust flow and low exhaust temperature conditions. However, under large exhaust flow and high exhaust temperature conditions, a small angle between the swirl blade and the airflow axis can achieve better urea mixing uniformity, while a large angle between the swirl blade and the airflow axis will increase the exhaust back pressure and reduce the economy of the engine.

[0004] For the post-treatment mixer with variable swirl blade inclination, when the diesel engine operating conditions change, the blade inclination can be adjusted to obtain NOx treatment capacity and exhaust back pressure that match the operating conditions, thereby obtaining better emission performance and economy. Specifically, when the diesel engine is running at low load, the swirl blade inclination is reduced; when the diesel engine is running at medium load, the swirl blade inclination is adjusted to be greater than the swirl blade inclination when running at low load; when the diesel engine is running at high load, the swirl blade inclination is adjusted to be perpendicular to the horizontal plane, or to a state close to perpendicular to the horizontal plane.

[0005] The following problems exist with respect to the above-mentioned after-treatment mixer with variable swirl blade inclination angle: (1) Exhaust temperature. Exhaust temperature has a great influence on urea atomization mixing. Moreover, for the after-treatment mixer located after the DOC (oxidation catalyst) and the DPF (particulate filter), the gas temperature at the mixer does not correspond to the engine load immediately in the transient cycle, but only depends on the load. When the engine switches from low load to high load, the exhaust temperature at the mixer is still relatively low at the beginning. At this time, adjusting the swirl blade inclination angle to be perpendicular to the horizontal plane will cause uneven mixing or even crystallization. When the engine switches from high load to low load, the exhaust temperature at the mixer is still relatively high at the beginning. At this time, adjusting the swirl blade inclination angle to be perpendicular to the horizontal plane will cause uneven mixing or even crystallization. (2) Urea injection amount. The amount of urea injection determines whether a more complex mixer is needed. The urea injection amount is not immediately corresponding to the engine load. For example, when the SCR temperature is too low, urea injection will be stopped to avoid crystallization. When the SCR temperature is sufficient but the ammonia storage capacity reaches the upper limit, urea injection will also be stopped. When a fault occurs, such as a urea pump failure, urea injection will also be stopped. In addition, when the downstream NOx increases, the closed-loop mode will be entered to spray urea. When urea injection is stopped, if the engine is at a medium or low load, reducing the swirl blade inclination will lose a certain amount of economy. When urea is sprayed in a closed loop, if the swirl blade inclination is not adjusted, uneven mixing or even crystallization will occur. Therefore, how to effectively realize the control of the adjustable post-treatment mixer has become a problem that needs to be solved urgently. Summary of the invention

[0006] The present application provides a control method, device, equipment and storage medium for an adjustable post-processing mixer, which can effectively realize the control of the adjustable post-processing mixer.

[0007] In a first aspect, an embodiment of the present application provides an adjustable post-processing mixer control method, the adjustable post-processing mixer control method comprising:

[0008] Obtaining a basic value and upper and lower limits of an angle between a swirl blade and an airflow axis, and obtaining a first correction coefficient of the angle based on a urea injection amount and an exhaust flow rate;

[0009] Determining the crystallization degree of the post-treatment mixer based on the DPF post-pressure and the exhaust flow rate to obtain a second correction coefficient of the angle;

[0010] Counting an average value of downstream NOx within a set time period, and obtaining a third correction coefficient of the angle based on the average value;

[0011] Based on the base value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle, a final angle value is calculated to implement post-processing mixer control.

[0012] In combination with the first aspect, in one implementation, the step of obtaining a basic value and upper and lower limits of an angle between a swirl blade and an airflow axis, and obtaining a first correction coefficient of the angle based on a urea injection amount and an exhaust flow rate, specifically includes:

[0013] Based on the exhaust flow rate and SCR inlet temperature, the corresponding MAP diagram is queried to obtain the basic value of the angle between the swirl blade and the airflow axis, as well as the upper and lower limits of the angle between the swirl blade and the airflow axis;

[0014] Based on the urea injection amount and the exhaust flow rate, the corresponding MAP diagram is queried to obtain a first correction coefficient of the angle between the swirl blade and the airflow axis.

[0015] In combination with the first aspect, in one implementation, the crystallization degree of the post-treatment mixer is determined based on the DPF post-pressure and the exhaust flow rate to obtain the second correction coefficient of the angle, specifically including:

[0016] The real-time angle between the swirl blade and the airflow axis is obtained, and when the real-time angle is less than the set value, the corresponding MAP diagram is queried according to the DPF after-pressure and the exhaust flow, the crystallization degree of the post-treatment mixer is obtained, and the second correction coefficient of the angle between the swirl blade and the airflow axis is obtained.

[0017] In combination with the first aspect, in one implementation, the statistical average value of downstream NOx within the set time period and obtaining the third correction coefficient of the angle based on the average value specifically include:

[0018] Obtain the SCR inlet temperature, and when the SCR inlet temperature is within the set temperature range, calculate the average value of downstream NOx within the set time period;

[0019] The corresponding MAP diagram is queried based on the average value to obtain a third correction coefficient of the angle between the swirl blade and the airflow axis.

[0020] In combination with the first aspect, in one implementation, the calculation of the final angle value based on the base value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle to realize the post-processing mixer control specifically includes:

[0021] According to the unit of the angle between the swirl blade and the airflow axis:

[0022] If the unit of the angle is degree, then based on the basic value of the angle, the first correction coefficient, the second correction coefficient, and the third correction coefficient, a final angle value is calculated by addition to achieve post-processing mixer control, and the final angle value is limited based on the upper and lower limits of the angle;

[0023] If the unit of the angle is dimensionless, the final angle value is calculated by multiplication based on the basic value of the angle, the first correction coefficient, the second correction coefficient, and the third correction coefficient to achieve post-processing mixer control, and the final angle value is limited based on the upper and lower limits of the angle.

[0024] In combination with the first aspect, in one implementation,

[0025] When judging the degree of crystallization of the post-processing mixer, if the degree of crystallization of the post-processing mixer is uncrystallized or the degree of crystallization is less than the set amount, the second correction coefficient is not used when calculating the final angle value;

[0026] When performing statistics on the average value of downstream NOx within a set time period, if the average value is less than a preset mean value, the third correction coefficient is not used when calculating the final angle value.

[0027] In combination with the first aspect, in one implementation, after calculating the final angle value to implement the post-processing mixer control, the method further includes:

[0028] The average value of downstream NOx within the set time period is calculated again;

[0029] Based on the average value obtained by the re-statistics, if the average value obtained by the re-statistics is not less than the average value of the downstream NOx in the set time period calculated previously, the final angle value is calculated again without using the third correction coefficient.

[0030] In a second aspect, an embodiment of the present application provides an adjustable post-processing mixer control device, the adjustable post-processing mixer control device comprising:

[0031] A first determination module, which is used to obtain a basic value and upper and lower limits of an angle between a swirl blade and an airflow axis, and obtain a first correction coefficient of the angle based on a urea injection amount and an exhaust flow rate;

[0032] A second determination module, which is used to determine the crystallization degree of the post-treatment mixer based on the DPF post-pressure and the exhaust flow rate to obtain a second correction coefficient of the angle;

[0033] A third determination module, which is used to calculate an average value of downstream NOx within a set time period, and obtain a third correction coefficient of the angle based on the average value;

[0034] An execution module is used to calculate a final angle value based on the basic value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle to achieve post-processing mixer control.

[0035] In a third aspect, an embodiment of the present application provides an adjustable post-processing mixer control device, the adjustable post-processing mixer control device comprising a processor, a memory, and an adjustable post-processing mixer control program stored in the memory and executable by the processor, wherein when the adjustable post-processing mixer control program is executed by the processor, the steps of the adjustable post-processing mixer control method described above are implemented.

[0036] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which an adjustable post-processing mixer control program is stored, wherein when the adjustable post-processing mixer control program is executed by a processor, the steps of the adjustable post-processing mixer control method described above are implemented.

[0037] The beneficial effects brought by the technical solution provided by the embodiments of the present application include:

[0038] Taking multiple factors into consideration to achieve the control of the angle between the swirl blade and the airflow axis, it can improve the uneven mixing and even crystallization problems when the operating condition changes from small load to large load, and when urea is sprayed in a closed loop, and can reduce the economic loss caused by the operating condition changing from large load to small load, and when urea spraying is stopped, and can avoid further increase of crystallization after a certain amount of urea crystallization has occurred. At the same time, when the downstream NOx increases due to the uniformity of urea mixing, the closed loop regulation strengthens the mixing and reduces emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a flow chart of the adjustable post-processing mixer control method of the present application;

[0040] Figure 2 It is a structural schematic diagram of a vehicle post-processing mixer;

[0041] Figure 3 This is a functional module schematic diagram of the adjustable post-processing mixer control device of the present application;

[0042] Figure 4 This is a schematic diagram of the hardware structure of the adjustable post-processing mixer control device of this application. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0045] In the first aspect, the embodiment of the present application provides an adjustable after-treatment mixer control method, which effectively realizes the control of the angle between the swirl blade and the airflow axis based on multiple factors, including exhaust flow, SCR inlet temperature, urea injection amount, DPF after-pressure and downstream NOx signal.

[0046] In one embodiment, referring to Figure 1 , Figure 1 Schematic diagram of the process flow of the adjustable post-processing mixer control method of the present application. Figure 1 As shown, the adjustable post-processing mixer control method includes:

[0047] S1: obtaining a basic value and upper and lower limits of an angle between a swirl blade and an airflow axis, and obtaining a first correction coefficient of the angle based on a urea injection amount and an exhaust flow rate;

[0048] S2: Determine the crystallization degree of the post-treatment mixer based on the DPF post-pressure and the exhaust flow rate to obtain a second correction coefficient of the angle;

[0049] S3: Calculating an average value of downstream NOx within a set time period, and obtaining a third correction coefficient of the angle based on the average value;

[0050] S4: Based on the basic value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle, a final angle value is calculated to implement post-processing mixer control.

[0051] See also Figure 2 As shown, it is a structural diagram of the vehicle after-treatment mixer. For a diesel engine, the exhaust flow rate is calculated using sensors on the engine. The after-treatment mixer is provided with an SCR inlet temperature sensor, a downstream NOx sensor, and a DPF pressure difference sensor, and the DPF pressure difference sensor has a post-pressure test function. The swirl blades of the after-treatment mixer are adjustable and can be motor-controlled or air-driven. The angle between the swirl blades and the airflow axis is adjusted by stepless adjustment or stepped adjustment.

[0052] Furthermore, in one embodiment, a basic value and upper and lower limits of the angle between the swirl blade and the airflow axis are obtained, and a first correction coefficient of the angle is obtained based on the urea injection amount and the exhaust flow rate, specifically including:

[0053] S101: Based on the exhaust flow rate and the SCR inlet temperature, query the corresponding MAP diagram to obtain the basic value of the angle between the swirl blade and the airflow axis, and the upper and lower limit values ​​of the angle between the swirl blade and the airflow axis;

[0054] S102: Based on the urea injection amount and the exhaust flow rate, query the corresponding MAP diagram to obtain a first correction coefficient of the angle between the swirl blade and the airflow axis.

[0055] Specifically, according to the exhaust flow rate and SCR inlet temperature, the corresponding two-dimensional MAP diagram is checked to obtain the basic value of the angle between the swirl blade and the airflow axis, as well as the upper and lower limits of the angle. The exhaust flow rate and temperature determine its ability to mix evenly with urea. When the exhaust flow rate is small or the exhaust temperature is low, a larger angle is required to enhance mixing; when the exhaust flow rate is large or the exhaust temperature is high, a smaller angle can achieve better mixing uniformity, while reducing exhaust back pressure to improve economy.

[0056] According to the urea injection amount and the exhaust flow rate, the corresponding two-dimensional MAP is checked to obtain the first correction coefficient of the angle. The unit of the first correction coefficient can be degree or dimensionless coefficient. The unit of other correction coefficients in this application is the same as that of the first correction coefficient. The ratio of urea injection amount to exhaust flow rate has a great influence on the mixing uniformity. When the urea injection amount is large, a larger angle is required to enhance the mixing; when the urea injection amount is small, especially when the urea injection is stopped, the angle can be reduced to improve the economy.

[0057] Further, in one embodiment, the crystallization degree of the post-treatment mixer is determined based on the DPF post-pressure and the exhaust flow rate to obtain the second correction coefficient of the angle, specifically including:

[0058] The real-time angle between the swirl blade and the airflow axis is obtained, and when the real-time angle is less than the set value, the corresponding MAP diagram is queried according to the DPF after-pressure and the exhaust flow, the crystallization degree of the post-treatment mixer is obtained, and the second correction coefficient of the angle between the swirl blade and the airflow axis is obtained.

[0059] Specifically, when the angle between the swirl blade and the airflow axis is small, the degree of crystallization of the post-processing mixer is obtained by checking the corresponding two-dimensional MAP diagram according to the DPF back pressure and the exhaust flow rate, thereby obtaining the second correction coefficient of the angle. It should be noted that when judging the degree of crystallization of the post-processing mixer, if the degree of crystallization of the post-processing mixer is uncrystallized or the degree of crystallization is less than the set amount (i.e., uncrystallized or the degree of crystallization is small), the second correction coefficient is not used when calculating the final angle value. When crystallization occurs in the post-processing mixer, the DPF back pressure will increase, and a larger angle is needed to enhance mixing to avoid further increase in crystallization.

[0060] Furthermore, in one embodiment, an average value of downstream NOx within a set time period is calculated, and a third correction coefficient of the angle is obtained based on the average value, specifically including:

[0061] S301: Obtaining the SCR inlet temperature, and when the SCR inlet temperature is within a set temperature range, calculating the average value of downstream NOx within a set time period;

[0062] S302: querying a corresponding MAP diagram based on the average value to obtain a third correction coefficient of the angle between the swirl blade and the airflow axis.

[0063] Specifically, when the SCR inlet temperature is within a suitable range, the average value of downstream NOx within a period of time is calculated, and then the corresponding one-dimensional MAP diagram is searched based on the average value to obtain the third correction coefficient of the angle.

[0064] It should be noted that when the average value of downstream NOx in a set time period is counted, if the average value is less than the preset mean value, the third correction coefficient is not used when calculating the final angle value. Furthermore, the increase of downstream NOx may be caused by uneven urea mixing. Increasing the angle to enhance mixing can reduce NOx. If NOx does not improve after increasing the angle, it means that the reason is not uneven mixing, but other reasons such as sulfur poisoning. At this time, the third correction coefficient is no longer used to calculate the final angle value to avoid unnecessary economic losses.

[0065] Further, in one embodiment, based on the base value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle, the final angle value is calculated to realize the post-processing mixer control, specifically including:

[0066] According to the unit of the angle between the swirl blade and the airflow axis:

[0067] If the unit of the angle is degree, then based on the basic value of the angle, the first correction coefficient, the second correction coefficient, and the third correction coefficient, a final angle value is calculated by addition to achieve post-processing mixer control, and the final angle value is limited based on the upper and lower limits of the angle;

[0068] If the unit of the angle is dimensionless, the final angle value is calculated by multiplication based on the basic value of the angle, the first correction coefficient, the second correction coefficient, and the third correction coefficient to achieve post-processing mixer control, and the final angle value is limited based on the upper and lower limits of the angle.

[0069] When the final angle value is calculated by addition or multiplication, if the calculated final angle value is greater than the upper limit value of the angle, the upper limit value of the angle is used as the final angle value; if the calculated final angle value is less than the lower limit value of the angle, the lower limit value of the angle is used as the final angle value.

[0070] Furthermore, after the final angle value is calculated to realize the post-processing mixer control, it also includes:

[0071] a: Count the average value of downstream NOx within the set time period again;

[0072] b: Based on the average value obtained by re-statistics, if the average value obtained by re-statistics is not less than the average value of downstream NOx in the set time period previously counted, the final angle value is calculated again without using the third correction coefficient.

[0073] Specifically, after the angle is corrected, if the average value of downstream NOx does not decrease, the third correction coefficient is no longer used to calculate the final angle value until the DPF is successfully regenerated and then the third correction coefficient is used again.

[0074] It should be noted that the above-mentioned relevant MAP diagrams are calibrated through bench or vehicle tests.

[0075] The adjustable post-treatment mixer control method of the embodiment of the present application realizes the control of the angle between the swirl blade and the airflow axis based on multiple factors, can improve the uneven mixing and even crystallization problems when the operating condition changes from small load to large load, and when urea is sprayed in a closed loop, can reduce the economic loss problems caused by the operating condition changing from large load to small load, and when urea spraying is stopped, and can avoid further increase of crystallization after a certain amount of urea crystallization has occurred. At the same time, when the downstream NOx increases due to the uniformity of urea mixing, the closed loop regulation strengthens the mixing and reduces emissions.

[0076] In a second aspect, an embodiment of the present application also provides an adjustable post-processing mixer control device.

[0077] In one embodiment, referring to Figure 3 , Figure 3 This is a functional module diagram of the adjustable post-processing mixer control device of this application. Figure 3 As shown, the adjustable post-processing mixer control device includes: a first determination module, a second determination module, a third determination module, and an execution module.

[0078] The first determination module is used to obtain the basic value and the upper and lower limits of the angle between the swirl blade and the airflow axis, and obtain the first correction coefficient of the angle based on the urea injection amount and the exhaust flow rate; the second determination module is used to determine the degree of crystallization of the post-treatment mixer based on the DPF post-pressure and the exhaust flow rate to obtain the second correction coefficient of the angle; the third determination module is used to calculate the average value of downstream NOx within a set time period, and obtain the third correction coefficient of the angle based on the average value; the execution module is used to calculate the final angle value based on the basic value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle to realize the post-treatment mixer control.

[0079] In a third aspect, an embodiment of the present application provides an adjustable post-processing mixer control device, which may be a device with data processing function, such as a personal computer (PC), a laptop computer, or a server.

[0080] Reference Figure 4 , Figure 4 Schematic diagram of the hardware structure of the adjustable post-processing mixer control device involved in the embodiment of the present application. In the embodiment of the present application, the adjustable post-processing mixer control device may include a processor, a memory, a communication interface and a communication bus.

[0081] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0082] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to interconnect the components inside the adjustable post-processing mixer control device, and an interface used to interconnect the adjustable post-processing mixer control device with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0083] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0084] The processor may be a general-purpose processor, and the general-purpose processor may call the adjustable post-processing mixer control program stored in the memory, and execute the adjustable post-processing mixer control method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the adjustable post-processing mixer control program is called may refer to the various embodiments of the adjustable post-processing mixer control method of the present application, which will not be repeated here.

[0085] Those skilled in the art will understand that Figure 4The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0086] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0087] The computer-readable storage medium of the present application stores an adjustable post-processing mixer control program, wherein when the adjustable post-processing mixer control program is executed by a processor, the steps of the adjustable post-processing mixer control method described above are implemented.

[0088] The method implemented when the adjustable post-processing mixer control program is executed can refer to the various embodiments of the adjustable post-processing mixer control method of the present application, and will not be described in detail here.

[0089] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0090] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0091] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0092] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0093] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0094] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for an adjustable post-processing mixer, characterized in that: The adjustable post-processing mixer control method comprises: Obtaining a basic value and upper and lower limits of an angle between a swirl blade and an airflow axis, and obtaining a first correction coefficient of the angle based on a urea injection amount and an exhaust flow rate; Determining the degree of crystallization of the post-treatment mixer based on the DPF post-pressure and the exhaust flow rate to obtain a second correction coefficient for the angle; Counting an average value of downstream NOx within a set time period, and obtaining a third correction coefficient of the angle based on the average value; Based on the base value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle, a final angle value is calculated to implement post-processing mixer control.

2. The adjustable post-processing mixer control method according to claim 1, characterized in that: The step of obtaining a basic value and upper and lower limits of an angle between the swirl blade and the airflow axis, and obtaining a first correction coefficient of the angle based on a urea injection amount and an exhaust flow rate, specifically includes: Based on the exhaust flow rate and SCR inlet temperature, the corresponding MAP diagram is queried to obtain the basic value of the angle between the swirl blade and the airflow axis, as well as the upper and lower limits of the angle between the swirl blade and the airflow axis; Based on the urea injection amount and the exhaust flow rate, the corresponding MAP diagram is queried to obtain a first correction coefficient of the angle between the swirl blade and the airflow axis.

3. The adjustable post-processing mixer control method according to claim 1, characterized in that: The method of determining the crystallization degree of the post-treatment mixer based on the DPF post-pressure and the exhaust flow rate to obtain the second correction coefficient of the angle specifically includes: The real-time angle between the swirl blade and the airflow axis is obtained, and when the real-time angle is less than the set value, the corresponding MAP diagram is queried according to the DPF after-pressure and the exhaust flow, the crystallization degree of the post-treatment mixer is obtained, and the second correction coefficient of the angle between the swirl blade and the airflow axis is obtained.

4. The adjustable post-processing mixer control method according to claim 1, characterized in that: The statistically calculating an average value of downstream NOx within a set time period and obtaining a third correction coefficient of the angle based on the average value specifically includes: Obtain the SCR inlet temperature, and when the SCR inlet temperature is within the set temperature range, calculate the average value of downstream NOx within the set time period; The corresponding MAP diagram is queried based on the average value to obtain a third correction coefficient of the angle between the swirl blade and the airflow axis.

5. The adjustable post-processing mixer control method according to claim 1, characterized in that: The method of calculating the final angle value based on the base value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle to realize the post-processing mixer control specifically includes: According to the unit of the angle between the swirl blade and the airflow axis: If the unit of the angle is degree, then based on the basic value of the angle, the first correction coefficient, the second correction coefficient, and the third correction coefficient, a final angle value is calculated by addition to achieve post-processing mixer control, and the final angle value is limited based on the upper and lower limits of the angle; If the unit of the angle is dimensionless, the final angle value is calculated by multiplication based on the basic value of the angle, the first correction coefficient, the second correction coefficient, and the third correction coefficient to achieve post-processing mixer control, and the final angle value is limited based on the upper and lower limits of the angle.

6. The adjustable post-processing mixer control method according to claim 5, characterized in that: When judging the degree of crystallization of the post-processing mixer, if the degree of crystallization of the post-processing mixer is uncrystallized or the degree of crystallization is less than the set amount, the second correction coefficient is not used when calculating the final angle value; When performing statistics on the average value of downstream NOx within a set time period, if the average value is less than a preset mean value, the third correction coefficient is not used when calculating the final angle value.

7. The adjustable post-processing mixer control method according to claim 5, characterized in that: After calculating the final angle value to achieve post-processing mixer control, it also includes: The average value of downstream NOx within the set time period is calculated again; Based on the average value obtained by the re-statistics, if the average value obtained by the re-statistics is not less than the average value of the downstream NOx in the set time period calculated previously, the final angle value is calculated again without using the third correction coefficient.

8. An adjustable post-processing mixer control device, characterized in that: The adjustable post-processing mixer control device comprises: A first determination module, which is used to obtain a basic value and upper and lower limits of an angle between a swirl blade and an airflow axis, and obtain a first correction coefficient of the angle based on a urea injection amount and an exhaust flow rate; A second determination module, which is used to determine the crystallization degree of the post-treatment mixer based on the DPF post-pressure and the exhaust flow rate to obtain a second correction coefficient of the angle; A third determination module, which is used to calculate an average value of downstream NOx within a set time period, and obtain a third correction coefficient of the angle based on the average value; An execution module is used to calculate a final angle value based on the basic value of the angle, the first correction coefficient, the second correction coefficient, the third correction coefficient, and the upper and lower limits of the angle to achieve post-processing mixer control.

9. An adjustable post-processing mixer control device, characterized in that: The adjustable post-processing mixer control device includes a processor, a memory, and an adjustable post-processing mixer control program stored in the memory and executable by the processor, wherein when the adjustable post-processing mixer control program is executed by the processor, the steps of the adjustable post-processing mixer control method as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores an adjustable post-processing mixer control program, wherein when the adjustable post-processing mixer control program is executed by a processor, the steps of the adjustable post-processing mixer control method according to any one of claims 1 to 7 are implemented.

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