CN112347618B - Method and device for determining urea thawing efficiency and storage medium - Google Patents
Method and device for determining urea thawing efficiency and storage medium Download PDFInfo
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Abstract
The application discloses a method and a device for determining urea thawing efficiency and a storage medium, relates to the technical field of engines, and is used for improving urea thawing safety and reducing potential safety hazards. According to the method, the theoretical temperature rise and the actual temperature rise of the urea box within the preset time are determined by acquiring the information of the whole vehicle, so that the urea thawing efficiency is determined according to the theoretical temperature rise and the actual temperature rise. And determining whether normal defrosting can be realized according to the urea defrosting efficiency. Therefore, on the basis of not increasing any cost of the engine and ensuring the economy of the whole vehicle, the safety of urea thawing is improved, and the diagnosis range is enlarged, so that the reliability of the whole vehicle can be better enhanced, and the user can use the system more humanized.
Description
Technical Field
The application relates to the technical field of engines, in particular to a method and a device for determining urea thawing efficiency and a storage medium.
Background
Urea plays an extremely important role in improving the treatment effect of diesel engine exhaust. Whereas the freezing point of urea is below 11 degrees below zero, there is a theoretical potential for urea freezing when the ambient temperature is below 11 degrees below zero. When the whole vehicle runs, the urea is frozen, and the urea pump cannot absorb the urea, so that the urea cannot be sprayed at a later time, the emission exceeds the standard easily, and the torsion of the whole vehicle is limited. In order to solve the problem that the urea is frozen, the urea thawing function is provided.
However, due to various reasons, a situation of thawing failure occurs in the thawing process, and therefore, in the existing thawing scheme, there is no monitoring scheme capable of determining whether thawing is successful, so that some potential safety hazards exist.
Disclosure of Invention
The embodiment of the application provides a method, a device and a storage medium for determining urea thawing efficiency, which are used for improving the safety of urea thawing and reducing potential safety hazards.
In a first aspect, an embodiment of the present application provides a method for determining a urea thawing efficiency, where the method includes:
acquiring information of the whole vehicle through an electronic control unit;
if the whole vehicle information meets the preset diagnosis condition, determining theoretical temperature rise and actual temperature rise of the urea box within preset time according to the whole vehicle information;
and taking the ratio of the actual temperature rise to the theoretical temperature rise as the thawing efficiency of the urea.
In one possible implementation manner, the vehicle information includes an ambient temperature and an engine water temperature;
determining that the vehicle information meets preset diagnosis conditions by the following method:
the whole vehicle is in the process of urea thawing;
the water temperature of the engine is higher than a first preset temperature;
the ambient temperature is higher than a second preset temperature.
In a possible implementation manner, determining the theoretical temperature rise of the urea tank within the preset time according to the vehicle information comprises:
determining the heat exchange value of the current urea box temperature and the engine water temperature within the preset time according to the corresponding relation between the urea box temperature and the heat exchange value of the engine water temperature within the preset time;
and calculating to obtain the theoretical temperature rise of the urea box within the preset time through a thermodynamic calculation formula and the determined heat exchange value.
In one possible implementation manner, determining the actual temperature rise of the urea tank within the preset time according to the vehicle information includes:
respectively acquiring the temperature values of the urea box at the end time of the preset time and the start time of the preset time;
and taking the difference value between the temperature value of the urea box at the end moment of the preset time and the temperature value of the urea box at the start moment of the preset time as the actual temperature rise of the urea box in the preset time.
In one possible implementation, after the taking the ratio of the actual temperature rise to the theoretical temperature rise as the urea thawing efficiency, the method further comprises:
and if the urea thawing efficiency is greater than a preset threshold value, thawing the urea box.
In a second aspect, an embodiment of the present application provides an apparatus for determining a urea thawing efficiency, including:
the acquisition module is used for acquiring the information of the whole vehicle through the electronic control unit;
the temperature rise determining module is used for determining theoretical temperature rise and actual temperature rise of the urea box within preset time according to the whole vehicle information if the whole vehicle information meets preset diagnosis conditions;
and the efficiency determining module is used for taking the ratio of the actual temperature rise to the theoretical temperature rise as the urea thawing efficiency.
In one possible implementation manner, the vehicle information includes an ambient temperature and an engine water temperature;
determining that the whole vehicle information meets preset diagnosis conditions through a diagnosis module:
the diagnosis module is specifically used for the whole vehicle in the urea thawing process;
the water temperature of the engine is higher than a first preset temperature;
the ambient temperature is higher than a second preset temperature.
In one possible implementation, the determining a temperature rise module includes:
a heat exchange value determining unit, configured to determine a heat exchange value of the current urea tank temperature and the engine water temperature within the preset time according to a correspondence between the urea tank temperature and the heat exchange value of the engine water temperature within the preset time;
and the theoretical temperature rise determining unit is used for calculating the theoretical temperature rise of the urea box within the preset time through a thermodynamic calculation formula and the determined heat exchange value.
In one possible implementation, determining the temperature rise module includes:
the temperature value acquisition unit is used for respectively acquiring the temperature values of the urea box at the end time of the preset time and the start time of the preset time;
and the actual temperature rise determining unit is used for taking the difference value between the temperature value of the urea box at the end moment of the preset time and the temperature value of the urea box at the start moment of the preset time as the actual temperature rise of the urea box in the preset time.
In one possible implementation, the apparatus further includes:
and the unfreezing module is used for unfreezing the urea box if the urea unfreezing efficiency is greater than a preset threshold value after the ratio of the actual temperature rise to the theoretical temperature rise is used as the urea unfreezing efficiency by the efficiency determining module.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
theoretical temperature rise and actual temperature rise of the urea box in the preset time are determined by obtaining information of the whole vehicle, and therefore the urea thawing efficiency is determined according to the theoretical temperature rise and the actual temperature rise. And determining whether normal thawing can be performed according to the urea thawing efficiency. Therefore, on the basis of not increasing any cost of the engine and ensuring the economy of the whole vehicle, the safety of urea thawing is improved, and the diagnosis range is enlarged, so that the reliability of the whole vehicle can be better enhanced, and the user can use the system more humanized.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic flow diagram of a method for determining urea thaw efficiency in an embodiment of the application;
FIG. 2 is a schematic diagram of a structure for determining the thawing efficiency of urea in the embodiment of the present application;
fig. 3 is a schematic structural diagram of a computing device according to an embodiment of the present application.
Detailed Description
In order to improve safety of urea thawing and reduce potential safety hazards, the embodiment of the application provides a method, a device and a storage medium for determining urea thawing efficiency. In order to better understand the technical solution provided by the embodiments of the present application, the following brief description is made on the basic principle of the solution:
urea plays an extremely important role in improving the treatment effect of diesel engine exhaust.
In the north, particularly in cold areas, in winter, urea in a urea tank of a diesel vehicle can be frozen through continuous low temperature at night after the whole vehicle stops running. The freezing point of urea is below 11 ℃ below zero, and when the ambient temperature is below 11 ℃ below zero, the urea has the possibility of being frozen theoretically. At present, urea is used as a reducing agent in the tail gas purification of the diesel engine, has important influence on emission and is indispensable for normal running of the whole vehicle.
If the whole vehicle runs, the urea pump cannot absorb the urea due to the fact that the urea is frozen, the urea cannot be sprayed at a later time, emission exceeding standards can be easily caused, and the whole vehicle is limited in torsion. In order to solve the problem that the urea is frozen, the urea thawing function is provided. The basic principle is that after urea is frozen and confirmed, the whole vehicle runs for a period of time, when the anti-freezing solution is heated to a certain temperature, a control valve is opened, the control valve is connected with a urea box and an engine water pump, the frozen urea is heated by controlling the flow of the anti-freezing solution of the whole vehicle, and then the urea is melted, so that the purpose of pressure building and injection is achieved.
And a control valve for unfreezing the urea controls the on-off of the antifreeze between the engine and the urea box. The antifreeze is used for heating the urea box. The control valve is provided with a section of filter screen for filtering impurities of the engine so as to protect the electromagnetic valve from being damaged. But along with the time lapse, the impurity that the filter screen filtered off can be more and more, and the impurity increases just can influence the discharge of water when the urea unfreezes, reduces the ability that the urea unfreezes, finally probably can make the urea function of unfreezing because the reduction of discharge leads to unfreezing failure to there are some potential safety hazards.
In addition, as a requirement of the latest environmental protection regulation, it is definitely specified that a finished automobile manufacturer must meet the realization of the urea thawing function.
In view of this, embodiments of the present application provide a method, an apparatus, and a storage medium for determining a urea thawing efficiency, which determine a theoretical temperature rise and an actual temperature rise of a urea tank within a preset time by obtaining information of a whole vehicle, so as to determine the urea thawing efficiency according to the theoretical temperature rise and the actual temperature rise. And determining whether normal thawing can be performed according to the urea thawing efficiency. Therefore, on the basis of not increasing any cost of the engine and ensuring the economy of the whole vehicle, the safety of urea thawing is improved, and the diagnosis range is enlarged, so that the reliability of the whole vehicle can be better enhanced, and the user is more humanized when using the urea thawing device.
The preferred embodiments of the present application will be described below with reference to the accompanying drawings of the specification, it should be understood that the preferred embodiments described herein are merely for illustrating and explaining the present application, and are not intended to limit the present application, and that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following further explains the multi-shot photographing processing method provided in the embodiments of the present application. As shown in fig. 1, the method comprises the following steps:
s101: and acquiring the information of the whole vehicle through an electronic control unit.
In the embodiment of the application, the whole vehicle collects each external condition through an Electronic Control Unit (ECU) to acquire information of the whole vehicle.
The whole vehicle information comprises information such as environment temperature, engine water temperature, urea box temperature and whether the whole vehicle is in a unfreezing process.
S102: and if the whole vehicle information meets the preset diagnosis condition, determining the theoretical temperature rise and the actual temperature rise of the urea box within the preset time according to the whole vehicle information.
In the embodiment of the application, after the whole vehicle information is acquired, the current state of the whole vehicle is determined according to the whole vehicle information, and if the whole vehicle information meets the preset diagnosis condition through logic judgment, diagnosis processing is performed on the whole vehicle.
Wherein whether the diagnostic condition is satisfied may be determined by:
1. the whole vehicle is in the process of urea thawing.
2. The engine water temperature is higher than a first preset temperature.
In general, when the engine water temperature is higher than 55 degrees or more, it is considered that the diagnostic condition is satisfied.
3. The ambient temperature is higher than a second preset temperature.
In the embodiment of the present application, the diagnostic condition is considered to be satisfied when the ambient temperature is higher than the preset temperature.
When one or all of the above conditions are satisfied, the diagnostic process is started.
When diagnosis processing is carried out, theoretical temperature rise and actual temperature rise within preset time are determined according to the information of the whole vehicle.
(1) Determining theoretical temperature rise:
in the embodiment of the present application, the heat exchange value is determined by the corresponding relationship, and the theoretical temperature rise is determined by the thermodynamic formula, which may be specifically implemented as:
determining the heat exchange value of the current urea box temperature and the engine water temperature within the preset time according to the corresponding relation between the urea box temperature and the heat exchange value of the engine water temperature within the preset time;
and calculating to obtain the theoretical temperature rise of the urea box within the preset time through a thermodynamic calculation formula and the determined exchange heat value.
In the embodiment of the present application, the correspondence relationship may be determined by:
under the condition of determining hardware conditions such as the thickness, the material and the urea volume of a pipeline, the urea water heating pipe is equivalent to a heat source approximate to a constant temperature T0, and the urea box is equivalent to a heat source approximate to a constant temperature T1. According to thermodynamic formulas, a heat exchange diagram based on the urea tank temperature and the engine water temperature can be obtained through simulation calculation under the condition that external boundary conditions are determined. Therefore, the heat exchange values corresponding to the urea tank temperature and the water temperature can be obtained through simulation calculation, and the corresponding relation between the heat exchange values of the urea tank temperature and the water temperature of the engine in the preset time is obtained.
It should be noted that the corresponding relationship may be stored in the entire vehicle database in advance, or may be obtained by performing simulation calculation when calculating the theoretical temperature rise.
In order to further determine the accuracy of theoretical temperature rise, when the method is applied to actual whole vehicles, correction based on the engine speed, the urea tank liquid level, the environment temperature and the vehicle speed is needed, and finally the exchange heat released when the engine anti-freezing solution is used for unfreezing in theory is obtained.
In order to achieve accuracy of the heat exchange value, the released heat calculated in each scheduling period of signal acquisition of the ECU is integrated once, and the heat exchange value with the integration time of t1 is calculated.
After the heat exchange value is obtained, the theoretical temperature rise T (theoretical temperature rise) caused by the antifreeze solution to the urea box within the time T1 is calculated through a thermodynamic formula Q = C (specific heat) m (mass) and delta T (temperature rise).
(2) Determining the actual temperature rise:
the actual temperature rise is determined according to the temperature value of the urea box at the starting moment, and the method can be specifically implemented as follows:
respectively acquiring the temperature values of the urea box at the end moment of the preset time and the start moment of the preset time;
and taking the difference value between the temperature value of the urea box at the end moment of the preset time and the temperature value of the urea box at the start moment of the preset time as the actual temperature rise of the urea box in the preset time.
In the embodiment of the application, the ECU acquires the temperature value T (original urea tank temperature) of the urea tank at the beginning of calculating the theoretical quantity of released heat, namely at the beginning of time T1, and acquires the temperature value T (latest temperature of the urea tank) of the urea tank at the end of time T1, namely at the end of calculating the theoretical quantity of released heat. The actual temperature rise T (actual) of the urea tank can be derived: t (actual temperature rise) = T (urea tank latest temperature) -T (original urea tank temperature).
For example: the preset time is 30 seconds, when heat begins to be released, the temperature of the urea box is 17 ℃ below zero, and after 30 seconds, the temperature of the urea box is 3 ℃ below zero, and the actual temperature rise is 14 ℃.
S103: and taking the ratio of the actual temperature rise to the theoretical temperature rise as the thawing efficiency of the urea.
In the embodiment of the application, after the theoretical temperature rise and the actual temperature rise are obtained, the ratio of the actual temperature rise to the theoretical temperature rise is used as the unfreezing efficiency of the urea, that is, the actual unfreezing efficiency D _ eta = T (actual temperature rise)/T (theoretical temperature rise).
In this way, whether or not the thawing can be successful is determined by the urea thawing efficiency.
In the embodiment of the application, the urea thawing efficiency is compared with a preset threshold, and if the urea thawing efficiency is lower than the preset threshold, it is determined that the heating pipeline is blocked or other faults causing efficiency reduction exist, and the urea can not be thawed successfully.
And if the urea thawing efficiency is higher than the preset threshold value, the thawing function is considered to be normal, and the urea can be thawed successfully. Therefore, if the urea thawing efficiency is greater than a preset threshold value, the urea tank is thawed.
Therefore, on the basis of not increasing any cost of the engine and ensuring the economy of the whole vehicle, the safety of urea thawing is improved, and the diagnosis range is enlarged, so that the reliability of the whole vehicle can be better enhanced, and the user is more humanized when using the urea thawing device.
Based on the same inventive concept, the embodiment of the application also provides a device for determining the urea thawing efficiency. As shown in fig. 2, the apparatus includes:
an obtaining module 201, configured to obtain information of a finished vehicle through an electronic control unit;
the temperature rise determining module 202 is used for determining theoretical temperature rise and actual temperature rise of the urea box within preset time according to the whole vehicle information if the whole vehicle information meets preset diagnosis conditions;
an efficiency determination module 203 for determining a ratio of the actual temperature rise to the theoretical temperature rise as a urea thaw efficiency.
In one possible implementation manner, the vehicle information includes an ambient temperature and an engine water temperature;
determining that the whole vehicle information meets preset diagnosis conditions through a diagnosis module:
the diagnosis module is specifically used for unfreezing the whole vehicle in the urea;
the water temperature of the engine is higher than a first preset temperature;
the ambient temperature is higher than a second preset temperature.
In one possible implementation, determining temperature rise module 202 includes:
the heat exchange value determining unit is used for determining the heat exchange values of the current urea box temperature and the engine water temperature within the preset time according to the corresponding relation between the urea box temperature and the heat exchange values of the engine water temperature within the preset time;
and the theoretical temperature rise determining unit is used for calculating the theoretical temperature rise of the urea box within the preset time through a thermodynamic calculation formula and the determined heat exchange value.
In one possible implementation, determining temperature rise module 202 includes:
the temperature value acquisition unit is used for respectively acquiring the temperature values of the urea box at the preset time ending moment and the preset time starting moment;
and the actual temperature rise determining unit is used for taking the difference value between the temperature value of the urea box at the end moment of the preset time and the temperature value of the urea box at the start moment of the preset time as the actual temperature rise of the urea box in the preset time.
In one possible implementation, the apparatus further includes:
and the unfreezing module is used for unfreezing the urea box if the urea unfreezing efficiency is greater than a preset threshold value after the efficiency module 203 takes the ratio of the actual temperature rise to the theoretical temperature rise as the urea unfreezing efficiency.
Based on the same technical concept, the present application further provides a terminal device 300, referring to fig. 3, the terminal device 300 is configured to implement the methods described in the above various method embodiments, for example, implement the embodiment shown in fig. 2, and the terminal device 300 may include a memory 301, a processor 302, an input unit 303, and a display panel 304.
A memory 301 for storing a computer program for execution by the processor 302. The memory 301 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the terminal device 300, and the like. The processor 302 may be a Central Processing Unit (CPU), a digital processing unit, or the like. The input unit 303 may be used to obtain a user instruction input by a user. The display panel 304 is configured to display information input by a user or information provided to the user, and in this embodiment of the present application, the display panel 304 is mainly used to display a display interface of each application program in the terminal device and a control entity displayed in each display interface. Alternatively, the display panel 304 may be configured in the form of a Liquid Crystal Display (LCD) or an organic light-emitting diode (OLED), and the like.
The embodiment of the present application does not limit the specific connection medium among the memory 301, the processor 302, the input unit 303, and the display panel 304. In the embodiment of the present application, the memory 301, the processor 302, the input unit 303, and the display panel 304 are connected through the bus 305 in fig. 3, the bus 305 is represented by a thick line in fig. 3, and the connection manner between other components is merely illustrative and not limited thereto. The bus 305 may be divided into an address bus, a data bus, a control bus, and the like. 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 memory 301 may be a volatile memory (volatile memory), such as a random-access memory (RAM); the memory 301 may also be a non-volatile memory (non-volatile memory) such as, but not limited to, a read-only memory (rom), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD), or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 301 may be a combination of the above memories.
The processor 302, configured to implement the embodiment shown in fig. 1, includes:
a processor 302 for invoking a computer program stored in the memory 301 to perform the embodiment as shown in fig. 1.
The embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions required to be executed by the processor, and includes a program required to be executed by the processor.
In some possible embodiments, the various aspects of a method for determining urea thawing efficiency provided herein may also be realized in the form of a program product comprising program code for causing a terminal device to perform the steps of a method for determining urea thawing efficiency according to various exemplary embodiments of the present application described herein above, when the program product is run on the terminal device. For example, the terminal device may perform the embodiment as shown in fig. 1.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
A program product for determining urea thaw efficiency of embodiments of the application may employ a portable compact disc read only memory (CD-ROM) and include program code and may be run on a computing device. However, the program product of the present application is not so limited, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including a physical programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device over any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., over the internet using an internet service provider).
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable document processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable document processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable document processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable document processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (12)
1. A method of determining a urea thaw efficiency, the method comprising:
acquiring information of the whole vehicle through an electronic control unit;
if the whole vehicle information meets the preset diagnosis condition, determining theoretical temperature rise and actual temperature rise of the urea box within preset time according to the whole vehicle information;
taking the ratio of the actual temperature rise to the theoretical temperature rise as the thawing efficiency of the urea;
wherein, according to the theoretical temperature rise of whole car information determination urea case in the time of predetermineeing includes:
determining the heat exchange values of the current urea box temperature and the engine water temperature in the preset time according to the corresponding relation of the heat exchange values of the urea box temperature and the engine water temperature in the preset time;
correcting the heat exchange value based on the engine rotating speed, the urea box liquid level, the environment temperature and the vehicle speed to obtain the heat exchange quantity released by the engine antifreeze for unfreezing the urea;
obtaining a heat exchange integral value with the integration time being the preset time based on the preset time and the heat exchange;
and obtaining the theoretical temperature rise of the urea box in the preset time based on a thermodynamic formula and the exchange heat integral value.
2. The method of claim 1, wherein the vehicle information includes ambient temperature, engine water temperature;
determining that the vehicle information meets preset diagnosis conditions by the following method:
the whole vehicle is in the process of urea thawing;
the water temperature of the engine is higher than a first preset temperature;
the ambient temperature is higher than a second preset temperature.
3. The method of claim 2, wherein determining a theoretical temperature rise of the urea tank within a preset time based on the vehicle information comprises:
determining the heat exchange value of the current urea box temperature and the engine water temperature within the preset time according to the corresponding relation between the urea box temperature and the heat exchange value of the engine water temperature within the preset time;
and calculating to obtain the theoretical temperature rise of the urea box within the preset time through a thermodynamic calculation formula and the determined exchange heat value.
4. The method of claim 1, wherein determining the actual temperature rise of the urea tank within a preset time based on the vehicle information comprises:
respectively acquiring the temperature values of the urea box at the end moment of the preset time and the start moment of the preset time;
and taking the difference value between the temperature value of the urea box at the end moment of the preset time and the temperature value of the urea box at the start moment of the preset time as the actual temperature rise of the urea box in the preset time.
5. The method according to claim 1, characterized in that after said taking the ratio of said actual temperature rise to said theoretical temperature rise as urea defrosting efficiency, said method further comprises:
and if the urea thawing efficiency is greater than a preset threshold value, thawing the urea box.
6. An apparatus for determining the thawing efficiency of urea, characterized in that it comprises:
the acquisition module is used for acquiring the information of the whole vehicle through the electronic control unit;
the temperature rise determining module is used for determining theoretical temperature rise and actual temperature rise of the urea box within preset time according to the whole vehicle information if the whole vehicle information meets preset diagnosis conditions;
an efficiency determining module for determining a ratio of the actual temperature rise to the theoretical temperature rise as a urea thawing efficiency;
wherein, the temperature rise determining module is specifically configured to:
determining the heat exchange values of the current urea box temperature and the engine water temperature in the preset time according to the corresponding relation of the heat exchange values of the urea box temperature and the engine water temperature in the preset time;
correcting the heat exchange value based on the engine rotating speed, the urea box liquid level, the environment temperature and the vehicle speed to obtain the heat exchange quantity released by the engine antifreeze for unfreezing the urea;
obtaining a heat exchange integral value with the integration time being the preset time based on the preset time and the heat exchange;
and obtaining the theoretical temperature rise of the urea box in the preset time based on a thermodynamic formula and the exchange heat integral value.
7. The apparatus of claim 6, wherein the vehicle information includes an ambient temperature, an engine water temperature;
determining that the whole vehicle information meets preset diagnosis conditions through a diagnosis module:
the diagnosis module is specifically used for unfreezing the whole vehicle in the urea;
the water temperature of the engine is higher than a first preset temperature;
the ambient temperature is higher than a second preset temperature.
8. The apparatus of claim 7, wherein the determine temperature rise module comprises:
the heat exchange value determining unit is used for determining the heat exchange values of the current urea box temperature and the engine water temperature within the preset time according to the corresponding relation between the urea box temperature and the heat exchange values of the engine water temperature within the preset time;
and the theoretical temperature rise determining unit is used for calculating the theoretical temperature rise of the urea box within the preset time through a thermodynamic calculation formula and the determined heat exchange value.
9. The apparatus of claim 6, wherein the determine temperature rise module comprises:
the temperature value acquisition unit is used for respectively acquiring the temperature values of the urea box at the preset time ending moment and the preset time starting moment;
and the actual temperature rise determining unit is used for taking the difference value between the temperature value of the urea box at the end moment of the preset time and the temperature value of the urea box at the start moment of the preset time as the actual temperature rise of the urea box in the preset time.
10. The apparatus of claim 6, further comprising:
and the unfreezing module is used for unfreezing the urea box if the urea unfreezing efficiency is greater than a preset threshold value after the ratio of the actual temperature rise to the theoretical temperature rise is used as the urea unfreezing efficiency by the efficiency determining module.
11. An electronic device, characterized in that it comprises a processor and a memory, wherein the memory stores program code which, when executed by the processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 5.
12. Computer-readable storage medium, characterized in that it comprises program code for causing an electronic device to carry out the steps of the method of any one of claims 1 to 5, when said program product is run on said electronic device.
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| CN113030399B (en) * | 2021-03-29 | 2024-02-20 | 潍柴动力股份有限公司 | Method and device for determining urea concentration |
| CN113700540B (en) * | 2021-09-14 | 2023-01-06 | 潍柴动力股份有限公司 | Method for detecting blockage of heating electromagnetic valve of urea tank and engine |
| CN115949738B (en) * | 2023-03-10 | 2023-05-23 | 潍柴动力股份有限公司 | AMT gear shifting control method, control system and vehicle |
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| JP2007262900A (en) * | 2006-03-27 | 2007-10-11 | Nissan Diesel Motor Co Ltd | Vehicular liquid tank and exhaust emission control device of engine having the tank |
| EP2215411A4 (en) * | 2007-11-07 | 2015-08-12 | Univ Utah Res Found | Ground-coupled heat exchange for heating and air conditioning applications |
| EP2273083A1 (en) * | 2009-07-09 | 2011-01-12 | Delphi Technologies, Inc. | Apparatus for maintening a urea solution in a liquid state for treatment of diesel exhaust |
| CN102147335B (en) * | 2010-12-31 | 2013-08-14 | 潍柴动力股份有限公司 | Method for testing unfreezing capacity of SCR (semiconductor control rectifier) system and system therefor |
| CN201983933U (en) * | 2010-12-31 | 2011-09-21 | 潍柴动力股份有限公司 | System for testing thawing capability of SCR (selective catalytic reduction) system |
| JP6019754B2 (en) * | 2012-05-29 | 2016-11-02 | いすゞ自動車株式会社 | Urea water thawing device |
| JP6062906B2 (en) * | 2014-10-23 | 2017-01-18 | 本田技研工業株式会社 | Exhaust gas purification device for internal combustion engine |
| CN109555583A (en) * | 2019-01-11 | 2019-04-02 | 安徽艾可蓝环保股份有限公司 | A kind of integrated gas helps formula urea injection system |
| CN110630364B (en) * | 2019-09-27 | 2020-12-22 | 潍柴动力股份有限公司 | Urea unfreezing method and device |
| CN110761879B (en) * | 2019-12-27 | 2020-04-14 | 潍柴动力股份有限公司 | Method and device for controlling urea crystallization, storage medium, and electronic device |
| CN111140318B (en) * | 2019-12-30 | 2021-06-22 | 潍柴动力股份有限公司 | Method, device and equipment for diagnosing urea thawing capacity and storage medium |
| CN111706420B (en) * | 2020-06-24 | 2021-05-04 | 安徽康明斯动力有限公司 | Control method for unfreezing and heating states of urea box |
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