CN115653732A - Urea injection amount calculation control method, urea injection amount calculation control device, electronic equipment and storage medium - Google Patents
Urea injection amount calculation control method, urea injection amount calculation control device, electronic equipment and storage medium Download PDFInfo
- Publication number
- CN115653732A CN115653732A CN202211433847.XA CN202211433847A CN115653732A CN 115653732 A CN115653732 A CN 115653732A CN 202211433847 A CN202211433847 A CN 202211433847A CN 115653732 A CN115653732 A CN 115653732A
- Authority
- CN
- China
- Prior art keywords
- ammonia
- value
- urea injection
- determining
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The embodiment of the application provides a urea injection quantity calculation control method, which comprises the following steps: acquiring the working condition of an engine and an actual ammonia value; determining a set minimum value and a set maximum value of the ammonia storage according to the working condition of the engine; and determining a urea injection state according to the set minimum value and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so that the ammonia value fluctuates in the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage. The method enables the ammonia storage capacity of the engine to fluctuate within the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage, effectively improves the ammonia storage capacity of the engine, and greatly reduces the possibility of ammonia leakage.
Description
Technical Field
The application relates to the technical field of engines, in particular to a urea injection quantity calculation control method.
Background
Along with the high-speed development of economy and the acceleration of urbanization speed, the utilization rate of automobiles by people is higher and higher, the convenience of life of people is greatly improved by using the automobiles, but the automobiles provide quick travel conditions for people and bring a series of disadvantages, particularly environmental problems, automobile exhaust emission is a very important factor, the health of people is seriously influenced, and a series of irreversible injuries are brought to the global environment. Therefore, control of engine NOx emissions is critical.
Currently, the SCR system in the aftertreatment system is mostly used to control the emission amount of NOx gas, and the principle is to inject urea into the exhaust gas discharged from the engine, decompose the urea to generate ammonia, and react the ammonia with NOx under the action of a catalyst, thereby reducing the emission of NOx. Meanwhile, in the prior art, although the traditional SCR closed-loop control strategy can form a closed-loop control system based on a downstream NOx sensor and realize control of a certain precision of urea injection amount, in most closed-loop control strategies, the storage and control of ammonia decomposed by urea are still not perfect, and ammonia value can only fluctuate in a small range, so that the ammonia storage capacity and the ammonia storage control capacity are poor, the emission of excessive ammonia can be possibly caused, and the environmental problem can still be caused.
Therefore, how to further realize the accurate control of the SCR and the accurate control of the ammonia emission in the SCR so as to meet the NOx emission requirement and ensure that the ammonia leakage amount does not exceed the standard becomes a problem to be solved urgently.
Disclosure of Invention
The application provides a urea injection quantity calculation control method, which aims to solve the problems that in the prior art, the storage and control of an SCR closed-loop control strategy on ammonia decomposed by urea are still not complete enough, and the ammonia value can only fluctuate in a small range, so that the ammonia storage capacity and the ammonia storage control capacity are poor, and the excessive emission of ammonia can be caused.
According to an aspect of the present application, there is provided a urea injection amount calculation control method including: acquiring the working condition of an engine and an actual ammonia value; determining a set minimum value and a set maximum value of the ammonia storage according to the working condition of the engine; and determining a urea injection state according to the set minimum value of the ammonia storage and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so as to enable the ammonia value to fluctuate within the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage.
As an optional implementation manner, the method further includes: acquiring a urea injection quantity basic value; acquiring an ammonia value storage state of the engine; determining an ammonia-nitrogen ratio correction factor according to the working condition of the engine; determining a urea injection quantity adjusting value according to the ammonia-nitrogen ratio correction factor and the engine working condition; determining a correction coefficient according to the ammonia value state of the engine; determining the urea injection quantity adjusting direction according to the correction coefficient; and determining an actual urea injection value according to the urea injection quantity basic value, the urea injection quantity adjusting value and the urea injection quantity adjusting direction.
As an alternative embodiment, the determining a correction factor according to the ammonia stored value state of the engine comprises: if the engine is in the ammonia value increasing state, the correction coefficient is 1; if the engine is in a reduced ammonia value state, the correction factor is-1.
As an alternative embodiment, the obtaining engine operating conditions comprises: obtaining space velocity, average temperature of catalyst carrier, catalyst volume and SCR inlet NO X At least one of concentration and exhaust mass flow.
As an alternative embodiment, the determining the set maximum ammonia storage value according to the engine operating condition includes: determining a unit volume ammonia storage set value according to the space velocity and the average temperature of the catalyst carrier; and determining the set maximum value of the ammonia storage according to the set value of the ammonia storage in unit volume and the volume of the catalyst.
As an alternative embodiment, the determining the urea injection amount adjustment amount according to the ammonia-nitrogen ratio correction factor and the engine operating condition includes: determining a required ammonia-nitrogen ratio according to the space velocity and the average temperature of the catalyst carrier; according to the required ammonia-nitrogen ratio and the SCR inlet NO X Determining the required ammonia concentration according to the concentration; determining a demanded ammonia mass flow base value according to the demanded ammonia concentration and the exhaust mass flow; determining a required ammonia mass flow adjustment value according to the required ammonia mass flow basic value and the ammonia nitrogen ratio correction factor; and calculating the urea injection quantity adjusting quantity according to the required ammonia mass flow adjusting value.
As an alternative embodiment, the determining an ammonia-to-nitrogen ratio correction factor based on the engine operating conditions comprises: and determining the ammonia nitrogen ratio correction factor according to the average temperature of the catalyst carrier.
According to another aspect of the present application, there is provided a urea injection amount calculation control device including: the acquisition module is used for acquiring the working condition of the engine and the actual ammonia value; the range determining module is used for determining a set minimum value and a set maximum value of the ammonia storage according to the working condition of the engine; and the urea injection state determining module is used for determining the urea injection state according to the set minimum value and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so that the ammonia value fluctuates in the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage.
According to another aspect of the present application, there is provided an electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus, and the memory is used for storing computer programs; the processor for executing the steps of the urea injection quantity calculation control method of any one of claims 1 to 7 by running the computer program stored on the memory.
According to another aspect of the present application, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is arranged to execute the steps of a urea injection quantity calculation control method according to any one of claims 1 to 7 when running.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention provides a urea injection amount calculation control method which comprises the steps of determining a set maximum value of ammonia storage according to the working condition of an engine, reducing urea injection amount if actual ammonia value reaches the set maximum value of the ammonia storage until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing urea injection amount and increasing the ammonia value. The method enables the ammonia storage capacity of the engine to fluctuate within the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage, effectively improves the ammonia storage capacity of the engine, and greatly reduces the possibility of ammonia leakage. At the same time, the method can set the minimum preset value to 0 to be able to exhaust the ammonia reserve in the same NO X The urea injection amount is reduced to a certain extent under the condition of the emission amount, the SCR is further accurately controlled, the ammonia emission in the SCR is accurately controlled, and the ammonia leakage amount is not over-standard on the basis of meeting the NOx emission requirement to the maximum extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a flow chart illustrating an alternative urea injection quantity calculation control method according to an embodiment of the present application;
FIG. 2 is an alternative urea injection quantity calculation control logic diagram according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an alternative urea injection quantity calculation control apparatus according to an embodiment of the present application;
fig. 4 is a block diagram of an alternative electronic device according to an embodiment of the present application.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those illustrated in the drawings, and are used merely to facilitate the description of the present invention and to simplify the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
During the starting and running of the automobile, the engine can generate a large amount of NO X And the emission of NOx brings great harm to human production and life and natural environment. The range of influence has been developed from local pollution to regional pollution and even global pollution. Control of NOx formation and emission is therefore a very important issue. The SCR system, which is an aftertreatment system, is currently used to control the amount of NOx gas emission, and the principle of this SCR system is to inject urea into the exhaust gas discharged from the engine, decompose the urea to produce ammonia, and react the ammonia with NOx by a catalyst, thereby reducing the NOx emission. However, although the SCR closed-loop control strategy in the prior art (for example, the invention patent with the application number of 201910646118.4) can form a closed-loop control system based on a downstream NOx sensor and realize control of a certain accuracy of urea injection amount, in most closed-loop control strategies, storage and control of ammonia decomposed by urea are still not complete enough, and an ammonia storage value can fluctuate only in a small range, so that the ammonia storage capacity and the ammonia storage control capacity are poor, emission of excessive ammonia is possibly caused, and environmental problems are still caused.
Therefore, according to an aspect of an embodiment of the present application, as shown in fig. 1, there is provided a urea injection amount calculation control method including:
s201, obtaining the working condition of an engine and an actual ammonia value;
s202, determining a set minimum value and a set maximum value of ammonia storage according to the working condition of the engine;
s203, determining a urea injection state according to the set minimum value of the ammonia storage and the set maximum value of the ammonia storage, if the actual ammonia storage value reaches the set maximum value of the ammonia storage, reducing urea injection amount until the actual ammonia storage value is reduced to the set minimum value of the ammonia storage, increasing urea injection amount, and increasing ammonia storage value so that the ammonia storage value fluctuates in the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage.
Specifically, during engine start conditions, the engine emits nitrogen oxides while the engine injects urea to decompose ammonia and react the ammonia and nitrogen oxides to form nitrogen and water. In this process, the nitrogen oxides and the emissions are not always kept at the basic value, on the basis of which too much or too little urea is injected, and when the amount of urea injected in real time exceeds the required amount of urea at that moment, part of ammonia cannot react with the nitrogen oxides, and the engine is required to correct the urea amount and store ammonia. At present, the urea amount is mostly corrected by adopting a traditional closed-loop control strategy and ammonia storage is carried out, and the ammonia storage amount can only fluctuate within a small range. The method can determine the set maximum value of the ammonia storage according to the working condition of the engine, and realizes the control of the urea injection amount by limiting the set maximum value of the ammonia storage, namely if the actual ammonia storage value reaches the set maximum value of the ammonia storage, the urea injection amount is reduced until the actual ammonia storage value is reduced to the set minimum value of the ammonia storage, the urea injection amount is increased, and the ammonia storage value is increased. The method enables the ammonia storage capacity of the engine to fluctuate within the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage, effectively improves the ammonia storage capacity of the engine, improves the control capacity of urea injection, and greatly reduces the possibility of ammonia leakage. At the same time, the process is able to deplete the ammonia storage at the same NO X The urea injection amount is reduced to a certain extent under the condition of the emission amount, the SCR is further accurately controlled, the ammonia emission in the SCR is accurately controlled, and the ammonia leakage amount is guaranteed not to exceed the standard to the maximum extent on the basis of meeting the NOx emission requirement.
It should be noted that the present application is not limited to the specific setting of the minimum setting value and the maximum setting value of the ammonia storage, and preferably, the minimum setting value of the ammonia storage may be set to 0 to exhaust the ammonia storage for the engine, so as to greatly expand the fluctuation range of the ammonia storage.
As an optional implementation manner, the method further includes: acquiring a urea injection quantity basic value; acquiring an ammonia value storage state of the engine; determining an ammonia-nitrogen ratio correction factor according to the working condition of the engine; determining a urea injection quantity adjusting value according to the ammonia-nitrogen ratio correction factor and the engine working condition; determining a correction coefficient according to the ammonia stored value state of the engine; determining the urea injection quantity adjusting direction according to the correction coefficient; and determining an actual urea injection value according to the urea injection quantity basic value, the urea injection quantity adjusting value and the urea injection quantity adjusting direction.
As an alternative embodiment, the determining a correction factor according to the ammonia stored value state of the engine comprises: if the engine is in the ammonia value increasing state, the correction coefficient is 1; if the engine is in a reduced ammonia value state, the correction factor is-1.
Specifically, as is readily understood in the above method, since the engine may be in a state where the urea injection amount is decreased or in a state where the urea injection amount is increased, the urea amount adjustment value may be either positive or negative when the urea injection amount adjustment value is determined based on the ammonia nitrogen ratio correction factor and the engine operating condition, the urea amount adjustment value is negative if the engine is in a state where the urea injection amount is decreased, or the urea amount adjustment value is positive if the engine is in a state where the urea injection amount is increased; based on this, the setting of the correction coefficient enables the method to accurately distinguish the urea injection quantity state and perform accurate calculation control.
As an alternative embodiment, the obtaining engine operating conditions comprises: obtaining space velocity, average temperature of catalyst carrier, catalyst volume and SCR inlet NO X At least one of the concentration and the exhaust mass flow.
Specifically, FIG. 2 is an alternative urea injection quantity calculation control logic, as shown in FIG. 2, wherein: scrC _ SvExh is airspeed; scrM _ TScrmean is the average temperature of the catalyst carrier; scrC _ ConcNoxScrUs are the SCR inlet NOx concentration; scrC _ MfExh is the exhaust mass flow; sysG _ VolScrCat _ c is catalyst volume; sysG _ MmolNh3_ c is the molar mass of NH 3; sysG _ MmolAir _ c is the molar mass of air; scrC _ MfNh3Stdy is an NH3 mass flow basic value; scrC _ MfNh3Dmd is a final value of the required NH3 mass flow; scrC _ dmRdcAgDes is the actual injection amount of urea; scrC _ RatNh3Dmd _ M is the ammonia nitrogen demand ratio MAP; scrC _ FacRatNh3Dmd is an ammonia nitrogen ratio correction factor; scrC _ LoadNh3Dmd _ M: the ammonia storage sets the maximum MAP.
As an alternative embodiment, the determining the set maximum value of the ammonia storage according to the engine operating condition includes: determining a unit volume ammonia storage set value according to the space velocity and the average temperature of the catalyst carrier; and determining the set maximum value of the ammonia storage according to the set value of the ammonia storage in unit volume and the volume of the catalyst.
Specifically, the ammonia storage set value per unit volume can be obtained by looking up the ammonia storage set value MAP, and the ammonia storage set value per unit volume is multiplied by the catalyst volume to obtain the maximum ammonia storage set value.
As an alternative embodiment, the determining the urea injection amount adjustment amount according to the ammonia-nitrogen ratio correction factor and the engine operating condition includes: determining a required ammonia-nitrogen ratio according to the space velocity and the average temperature of the catalyst carrier; according to the required ammonia-nitrogen ratio and the SCR inlet NO X Determining the required ammonia concentration according to the concentration; determining a demanded ammonia mass flow base value according to the demanded ammonia concentration and the exhaust mass flow; determining a required ammonia mass flow adjustment value according to the required ammonia mass flow basic value and the ammonia nitrogen ratio correction factor; and calculating the urea injection quantity adjusting quantity according to the required ammonia mass flow adjusting value.
Specifically, as shown in fig. 2, the ammonia-nitrogen ratio MAP is searched according to the space velocity and the average temperature of the catalyst carrier to obtain the required ammonia-nitrogen ratio; the required ammonia nitrogen ratio is multiplied by NOx concentration at an SCR inlet to obtain required ammonia concentration, the required ammonia concentration, exhaust mass flow, ammonia molar mass and air molar mass are calculated to obtain a basic value of the required ammonia mass flow, and the basic value of the required ammonia mass flow is multiplied by an ammonia nitrogen ratio correction factor and a correction coefficient to obtain required ammonia mass flow adjustment quantity; the requested ammonia mass flow adjustment is multiplied by 5.425 to obtain the urea injection amount adjustment.
In an alternative embodiment, the determining the ammonia-to-nitrogen ratio correction factor according to the engine operating condition includes: and determining the ammonia nitrogen ratio correction factor according to the average temperature of the catalyst carrier.
Specifically, an ammonia nitrogen ratio correction factor curve is checked according to the average temperature of the catalyst carrier to obtain an ammonia nitrogen ratio correction factor.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present application or portions contributing to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, or an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute a urea injection amount calculation control method according to various embodiments of the present application.
According to another aspect of the embodiment of the present application, there is also provided a urea injection amount calculation control apparatus. Fig. 3 is a schematic diagram of a urea injection amount calculation control apparatus according to an embodiment of the present application, which may include, as shown in fig. 3:
an acquisition module 502 for acquiring engine operating conditions and actual ammonia stored value;
a range determination module, 504, determining an ammonia storage set minimum value and an ammonia storage set maximum value based on the engine operating conditions;
and a urea injection state determining module 506 for determining a urea injection state according to the set minimum value and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so that the ammonia value fluctuates within the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage.
Fig. 3 is a block diagram of an alternative electronic device according to an embodiment of the present invention, as shown in fig. 3, including a processor 602, a communication interface 604, a memory 606, and a communication bus 608, where the processor 602, the communication interface 604, and the memory 606 communicate with each other through the communication bus 608, where,
a memory 606 for storing computer programs;
the processor 602, when executing the computer program stored in the memory 606, implements the following steps:
acquiring the working condition of an engine and an actual ammonia value;
determining a set minimum value and a set maximum value of the ammonia storage according to the working condition of the engine;
and determining a urea injection state according to the set minimum value of the ammonia storage and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so as to enable the ammonia value to fluctuate within the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage.
According to still another aspect of the embodiments of the present application, there is also provided an electronic device for implementing the above-described urea injection amount calculation control method, which may be a server, a terminal, or a combination thereof.
Alternatively, in this embodiment, the communication bus may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 3, but this does not mean only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The memory may include RAM, and may also include non-volatile memory, such as at least one disk memory. Alternatively, the memory may be at least one memory device located remotely from the processor.
Other module units in the urea injection amount calculation control device can be included, but are not limited to, and are not described in detail in this example.
The processor may be a general-purpose processor, and may include but is not limited to: a CPU (Central Processing Unit), an NP (Network Processor), and the like; but also a DSP (Digital Signal Processing), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment is not described herein again.
It will be understood by those skilled in the art that the structure shown in fig. 4 is only an illustration, and the device implementing the urea injection amount calculation control method may be a terminal device, and the terminal device may be a terminal device such as a smart phone (e.g., android phone, IOS phone, etc.), a tablet computer, a palm computer, a Mobile Internet Device (MID), a PAD, etc. Fig. 4 is a diagram illustrating the structure of the electronic device. For example, the terminal device may also include more or fewer components (e.g., network interfaces, display devices, etc.) than shown in FIG. 4, or have a different configuration than shown in FIG. 4.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by a program instructing hardware associated with the terminal device, where the program may be stored in a computer-readable storage medium, and the storage medium may include: flash disk, ROM, RAM, magnetic or optical disk, and the like.
According to still another aspect of an embodiment of the present application, there is also provided a storage medium. Alternatively, in the present embodiment, the storage medium described above may be used for program code for executing the urea injection amount calculation control method.
Optionally, in this embodiment, the storage medium may be located on at least one of a plurality of network devices in a network shown in the above embodiment.
Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:
acquiring the working condition of an engine and an actual ammonia value;
determining a set minimum value and a set maximum value of the ammonia storage according to the working condition of the engine;
and determining a urea injection state according to the set minimum value and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so that the ammonia value fluctuates in the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage. For specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments, and details of the examples are not described herein again.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a U disk, a ROM, a RAM, a removable hard disk, a magnetic disk, or an optical disk.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
The integrated unit in the above embodiments, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in the above computer-readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a storage medium, and including instructions for causing one or more electronic devices (which may be personal computers, servers, network devices, or the like) to execute all or part of the steps of the method described in the embodiments of the present application.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be implemented in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, and may also be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution provided in the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A urea injection amount calculation control method characterized by comprising:
acquiring the working condition of an engine and an actual ammonia value;
determining a set minimum value and a set maximum value of the ammonia storage according to the working condition of the engine;
and determining a urea injection state according to the set minimum value and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so that the ammonia value fluctuates in the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage.
2. A urea injection quantity calculation control method as set forth in claim 1, characterized by further comprising:
acquiring a urea injection quantity basic value;
acquiring an ammonia value storage state of the engine;
determining an ammonia-nitrogen ratio correction factor according to the working condition of the engine;
determining a urea injection quantity adjusting value according to the ammonia-nitrogen ratio correction factor and the engine working condition;
determining a correction coefficient according to the ammonia stored value state of the engine;
determining the urea injection quantity adjusting direction according to the correction coefficient;
and determining the actual urea injection value according to the urea injection quantity basic value, the urea injection quantity adjusting value and the urea injection quantity adjusting direction.
3. The urea injection quantity calculation control method according to claim 2, wherein said determining a correction coefficient according to the state of the ammonia stored in the engine includes:
if the engine is in the ammonia value increasing state, the correction coefficient is 1;
if the engine is in a reduced ammonia value state, the correction factor is-1.
4. A urea injection quantity calculation control method as set forth in claim 3, wherein said obtaining engine operating conditions includes:
obtaining space velocity, average temperature of catalyst carrier, catalyst volume and SCR inlet NO X At least one of the concentration and the exhaust mass flow.
5. A urea injection quantity calculation control method as set forth in claim 4, wherein said determining an ammonia storage set maximum value according to the engine operating condition includes:
determining a unit volume ammonia storage set value according to the space velocity and the average temperature of the catalyst carrier;
and determining the set maximum ammonia storage value according to the set ammonia storage value in unit volume and the volume of the catalyst.
6. A urea injection quantity calculation control method as set forth in claim 4, characterized in that said determining a urea injection quantity adjustment quantity based on said ammonia-nitrogen ratio correction factor and said engine operating condition includes:
determining a required ammonia-nitrogen ratio according to the space velocity and the average temperature of the catalyst carrier;
according to the required ammonia-nitrogen ratio and the SCR inlet NO X Determining the required ammonia concentration according to the concentration;
determining a demanded ammonia mass flow base value according to the demanded ammonia concentration and the exhaust mass flow;
determining a required ammonia mass flow adjustment value according to the required ammonia mass flow basic value and the ammonia nitrogen ratio correction factor;
and calculating the urea injection quantity adjusting quantity according to the required ammonia mass flow adjusting value.
7. A urea injection quantity calculation control method as set forth in claim 4, characterized in that said determining an ammonia-nitrogen ratio correction factor according to said engine operating condition includes:
and determining the ammonia nitrogen ratio correction factor according to the average temperature of the catalyst carrier.
8. A urea injection amount calculation control device is characterized by comprising:
the acquisition module is used for acquiring the working condition of the engine and the actual ammonia value;
the range determining module is used for determining a set minimum value and a set maximum value of the ammonia storage according to the working condition of the engine;
and the urea injection state determining module is used for determining the urea injection state according to the set minimum value and the set maximum value of the ammonia storage, and if the actual ammonia value reaches the set maximum value of the ammonia storage, reducing the urea injection amount until the actual ammonia value is reduced to the set minimum value of the ammonia storage, increasing the urea injection amount, and increasing the ammonia value so that the ammonia value fluctuates in the range from the set minimum value of the ammonia storage to the set maximum value of the ammonia storage.
9. An electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein said processor, said communication interface and said memory communicate with each other via said communication bus,
the memory for storing a computer program;
the processor for executing the urea injection quantity calculation control method steps of any one of claims 1 to 7 by executing the computer program stored on the memory.
10. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is arranged to execute the steps of a urea injection quantity calculation control method according to any one of claims 1 to 7 when running.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433847.XA CN115653732A (en) | 2022-11-16 | 2022-11-16 | Urea injection amount calculation control method, urea injection amount calculation control device, electronic equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433847.XA CN115653732A (en) | 2022-11-16 | 2022-11-16 | Urea injection amount calculation control method, urea injection amount calculation control device, electronic equipment and storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115653732A true CN115653732A (en) | 2023-01-31 |
Family
ID=85019482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211433847.XA Pending CN115653732A (en) | 2022-11-16 | 2022-11-16 | Urea injection amount calculation control method, urea injection amount calculation control device, electronic equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115653732A (en) |
-
2022
- 2022-11-16 CN CN202211433847.XA patent/CN115653732A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108150300B (en) | Method and device for correcting NOx original emission model value of diesel engine | |
| CN100385102C (en) | System for controlling the urea supply to SCR catalysts | |
| RU2708567C2 (en) | Method of operation of exhaust system (embodiments) and exhaust system of vehicle | |
| CN111734516B (en) | Engine emission data correction method and device and ECU | |
| CN112627945B (en) | Method, device and equipment for correcting urea injection amount and storage medium | |
| CN112576351A (en) | Method, device, equipment and medium for obtaining engine nitrogen oxide model value | |
| CN115653732A (en) | Urea injection amount calculation control method, urea injection amount calculation control device, electronic equipment and storage medium | |
| CN112560939B (en) | Model verification method and device and computer equipment | |
| CN112302762A (en) | Exhaust control method, device and equipment | |
| CN116971863A (en) | Control method and device for urea injection quantity, readable storage medium and electronic equipment | |
| CN114607495B (en) | Method and device for determining concentration of nitrogen oxide, electronic equipment and storage medium | |
| CN116220870A (en) | Control method and device for vehicle exhaust emission, electronic equipment and storage medium | |
| CN114837776B (en) | SCR system control method, electronic device and storage medium | |
| CN116446984A (en) | Modified SCR efficiency model, modification method and vehicle | |
| CN113153501B (en) | Urea injection amount control method and related equipment | |
| CN113153502B (en) | Fault determination method and fault determination system for engine SCR carrier and engine | |
| CN112362194B (en) | Sensor detection method and device | |
| CN108241583A (en) | Data processing method, application server and the computer readable storage medium that wages calculate | |
| CN115030800A (en) | SCR system control method and device and vehicle | |
| CN117345384A (en) | Method and device for reducing urea crystallization of engine and electronic equipment | |
| CN114810456B (en) | Method, device, equipment and storage medium for correcting engine advance angle | |
| CN111888935B (en) | Vehicle exhaust gas treatment method and device, computer equipment and storage medium | |
| CN110594068A (en) | Method, device and equipment for detecting fuel injection quantity and storage medium | |
| CN116127616B (en) | Real-time monitoring method and system for nitrogen oxide tail gas emission of diesel vehicle road | |
| CN109538365A (en) | Control method, device and the diesel engine of fuel injection advanced angle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |