CN113030399A - Method and device for determining urea concentration - Google Patents
Method and device for determining urea concentration Download PDFInfo
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- CN113030399A CN113030399A CN202110336388.2A CN202110336388A CN113030399A CN 113030399 A CN113030399 A CN 113030399A CN 202110336388 A CN202110336388 A CN 202110336388A CN 113030399 A CN113030399 A CN 113030399A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 481
- 239000004202 carbamide Substances 0.000 title claims abstract description 481
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000004590 computer program Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 11
- 239000007864 aqueous solution Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The disclosure provides a method and a device for determining urea concentration. The method comprises the following steps: periodically acquiring reference urea concentration in a urea box; determining a urea concentration difference value through the reference urea concentration and the actual urea concentration of the previous period, and comparing the urea concentration difference value with a first preset threshold value; if the urea concentration difference is not larger than the first preset threshold value, determining the actual urea concentration of the period according to the first urea temperature and the second urea temperature; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration. Therefore, whether floating ice, bubbles and the like exist in the urea box or not is determined according to the temperatures of the first urea and the second urea, the influence on the measurement of the urea concentration due to the existence of the floating ice, the bubbles and the like is avoided, and the accuracy of the urea concentration detection result is improved.
Description
Technical Field
The invention relates to the technical field of vehicle exhaust treatment, in particular to a method and a device for determining urea concentration.
Background
Urea for vehicles is used in a vehicle aftertreatment system to spray an aqueous urea solution into a vehicle exhaust passage through a nozzle and to hydrolyze the urea using heat of exhaust gas to generate ammonia, which serves as a reducing agent of a selective catalytic reduction device, achieving reduction of nitrogen oxides in diesel vehicle exhaust.
In the prior art, a urea quality sensor is used for detecting the concentration of urea in a urea aqueous solution in a urea tank. However, as the vehicle travels, the urea tank containing the urea aqueous solution inevitably vibrates, thereby bubbling the urea aqueous solution, which disturbs the detection of the concentration of the urea aqueous solution by the urea quality sensor due to the difference in the propagation rates of the ultrasonic waves in the gas and the liquid. When a vehicle is in a cold region, ice floating can occur in a urea tank, and the propagation speed of ultrasonic waves in liquid and solid is different, so that the ice floating can interfere the detection of the urea concentration by a urea quality sensor. This results in a lower accuracy of the detection of the urea concentration.
Disclosure of Invention
The disclosure provides a method and a device for determining urea concentration, which are used for improving the accuracy of a detection result of the urea concentration.
A first aspect of the present disclosure provides a method for determining a urea concentration, the method being used for detecting a concentration of urea in a urea tank of an automobile, the method including:
periodically acquiring reference urea concentration in a urea box;
determining a urea concentration difference value through the reference urea concentration and the actual urea concentration of the previous period, and comparing the urea concentration difference value with a first preset threshold value;
if the urea concentration difference is not larger than the first preset threshold value, determining the actual urea concentration of the period according to the first urea temperature and the second urea temperature; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration.
In this embodiment, when it is determined that the urea concentration difference is not greater than the first preset threshold, the actual temperature of the present cycle is determined by the temperature of the urea in the urea tank (the first urea temperature) and the temperature of the reference urea concentration (the second urea temperature), and thus, whether or not ice floes, bubbles, and the like exist in the urea tank is determined according to the first urea temperature and the second urea temperature, so that the influence on the measurement of the urea concentration due to the existence of the ice floes, bubbles, and the like is avoided, and the accuracy of the urea concentration detection result is improved.
In one embodiment, the method further comprises:
and if the urea concentration difference is determined to be larger than the first preset threshold, determining the reference urea concentration as the actual urea concentration of the period.
Whether further judgment of the urea concentration is needed or not is determined through the urea concentration difference, and when the urea concentration difference is determined to be larger than the first preset threshold, the actual urea concentration of the period can be directly output without further determination of the urea concentration, so that the calculation amount is saved.
In one embodiment, the determining the actual urea concentration for the present cycle based on the first urea temperature and the second urea temperature includes:
determining a urea temperature difference value according to the first urea temperature and the second urea temperature;
if the urea temperature difference is larger than a second preset threshold, determining the reference urea concentration as the actual urea concentration of the period; or the like, or, alternatively,
and if the urea temperature difference is not greater than the second preset threshold, determining the actual urea temperature in the previous period as the actual urea temperature in the current period.
In this embodiment, whether floating ice or bubbles exist is determined by comparing the urea temperature difference with a second preset threshold, and the actual urea temperature in the period is determined according to the comparison result. Thereby improving the accuracy of the detection result.
In one embodiment, the urea temperature difference is determined according to the following:
determining an absolute value of a difference between the first urea temperature and the second urea temperature as the urea temperature difference; and/or the presence of a gas in the gas,
determining the urea concentration difference according to the following mode:
and determining the absolute value of the difference value between the reference urea concentration and the actual urea concentration of the previous period as the urea concentration difference value.
In this embodiment, the absolute value of the difference between the first urea temperature and the second urea temperature is determined as the urea temperature difference and/or the absolute value of the difference between the reference urea concentration and the actual urea concentration of the previous period is determined as the urea concentration difference, so that the urea temperature difference and/or the urea concentration difference can be determined more accurately.
In one embodiment, the reference urea concentration is determined by a urea quality sensor;
before the period obtains the reference urea concentration in the urea box, the method further comprises the following steps:
determining that the urea quality sensor is not faulty.
The embodiment detects whether the small urea quality sensor has a fault before determining the reference urea concentration so as to avoid the low accuracy rate of the detection of the urea concentration caused by the fault of the urea quality sensor, thereby further improving the accuracy of the detection result.
A second aspect of the present disclosure provides a urea concentration determination apparatus for detecting a concentration of urea in a urea tank of an automobile, the apparatus including:
the reference urea concentration acquisition module is used for periodically acquiring reference urea concentration in the urea box;
the first comparison module is used for determining a urea concentration difference value according to the reference urea concentration and the actual urea concentration of the previous period, and comparing the urea concentration difference value with a first preset threshold value;
the first actual urea concentration determining module is used for determining the actual urea concentration of the period according to the first urea temperature and the second urea temperature if the urea concentration difference is determined not to be larger than the first preset threshold; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration.
In one embodiment, the apparatus further comprises:
the device further comprises:
and the second actual urea concentration determining module is used for determining the reference urea concentration as the actual urea concentration of the period if the urea concentration difference is determined to be greater than the first preset threshold.
In one embodiment, the first actual urea concentration determination module is specifically configured to:
determining a urea temperature difference value according to the first urea temperature and the second urea temperature;
if the urea temperature difference is larger than a second preset threshold, determining the reference urea concentration as the actual urea concentration of the period; or the like, or, alternatively,
and if the urea temperature difference is not greater than the second preset threshold, determining the actual urea temperature in the previous period as the actual urea temperature in the current period.
In one embodiment, the apparatus further comprises:
a urea temperature difference determination module for determining a urea temperature difference according to the following:
determining an absolute value of a difference between the first urea temperature and the second urea temperature as the urea temperature difference;
a urea concentration difference determination module configured to determine the urea concentration difference according to:
and determining the absolute value of the difference value between the reference urea concentration and the actual urea concentration of the previous period as the urea concentration difference value.
In one embodiment, the reference urea concentration is determined by a urea quality sensor; the device further comprises:
a fault detection module to determine that the urea quality sensor is not faulty before the reference urea concentration in the urea tank is periodically obtained.
According to a third aspect of the embodiments of the present disclosure, there is provided an electronic apparatus including:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions for execution by the at least one processor; the instructions are executable by the at least one processor to enable the at least one processor to perform the method of the first aspect.
According to a fourth aspect provided by an embodiment of the present disclosure, there is provided a computer storage medium storing a computer program for executing the method according to the first aspect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is one of the schematic flow diagrams of a method of determining urea concentration according to one embodiment of the present disclosure;
FIG. 2 is a second schematic flow chart of a method of determining urea concentration according to one embodiment of the present disclosure;
FIG. 3 is a urea concentration determination device according to one embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The term "and/or" in the embodiments of the present disclosure describes an association relationship of associated objects, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The application scenario described in the embodiment of the present disclosure is for more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not form a limitation on the technical solution provided in the embodiment of the present disclosure, and as a person having ordinary skill in the art knows, with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present disclosure is also applicable to similar technical problems. In the description of the present disclosure, the term "plurality" means two or more unless otherwise specified.
In the prior art, the urea concentration in the urea aqueous solution is detected by a urea quality sensor. However, as the vehicle travels, the urea tank containing the urea aqueous solution inevitably vibrates, thereby bubbling the urea aqueous solution, which disturbs the detection of the concentration of the urea aqueous solution by the urea quality sensor due to the difference in the propagation rates of the ultrasonic waves in the gas and the liquid. When a vehicle is in a cold region, ice floating can occur in a urea tank, and the propagation speed of ultrasonic waves in liquid and solid is different, so that the ice floating can interfere the detection of the urea concentration by a urea quality sensor. This results in a lower accuracy of the detection of the urea concentration.
Therefore, the present disclosure provides a method for determining a urea concentration, wherein when it is determined that a difference between urea concentrations is not greater than a first preset threshold, an actual temperature of the present cycle is determined by a temperature of urea in a urea tank (a first urea temperature) and a temperature of a reference urea concentration (a second urea temperature), and thus, whether ice floes, bubbles, and the like exist in the urea tank is determined according to the first urea temperature and the second urea temperature, so that influence on measurement of the urea concentration due to the presence of the ice floes, bubbles, and the like is avoided, and thus, accuracy of a urea concentration detection result is improved. The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, which is a schematic flow chart of the method for determining the urea concentration of the present disclosure, the method may include the following steps:
step 101: periodically acquiring reference urea concentration in a urea box;
wherein the reference urea concentration is determined by a urea quality sensor.
To ensure that the value of the reference urea concentration obtained is accurate, in one embodiment, it is determined that the urea quality sensor is not malfunctioning before step 101 is performed.
For example, if it is determined that there is no fault with the urea quality sensor in the urea tank, step 101 may be performed directly. If it is determined that the urea quality sensor in the urea tank has a fault, a repair signal may be sent, and the step 101 is continuously executed until it is determined that the urea quality sensor has no fault.
Therefore, whether the small urea quality sensor has faults or not is detected before the reference urea concentration is determined, so that the problem that the accuracy of detection of the urea concentration is low due to the fact that the urea quality sensor has the faults is avoided, and therefore the accuracy of the detection result is further improved.
Step 102: determining a urea concentration difference value through the reference urea concentration and the actual urea concentration of the previous period, and comparing the urea concentration difference value with a first preset threshold value;
in one embodiment, the urea concentration difference is determined according to the following:
and determining the absolute value of the difference value between the reference urea concentration and the actual urea concentration of the previous period as the urea concentration difference value.
Wherein the urea concentration difference may be determined according to formula (1):
σ＝|C1-C2|(1)；
wherein, sigma is the urea concentration difference, C1As reference urea concentration, C2Is the actual urea concentration of the previous cycle.
Step 103: if the urea concentration difference is not larger than the first preset threshold value, determining the actual urea concentration of the period according to the first urea temperature and the second urea temperature; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration.
It should be noted that the first urea temperature is measured by a temperature probe in the urea tank, and the second urea temperature is measured by a urea quality sensor. Due to the distance between the temperature probe and the urea quality sensor, a temperature difference is generated. The positions and distances between the temperature probe and the urea quality sensor can be set according to actual requirements, and the disclosure is not limited herein.
In one embodiment, step 103 may be embodied as: determining a urea temperature difference value according to the first urea temperature and the second urea temperature; if the urea temperature difference is larger than a second preset threshold, determining the reference urea concentration as the actual urea concentration of the period; or, if the urea temperature difference is not greater than the second preset threshold, determining the actual urea temperature in the previous period as the actual urea temperature in the present period.
Wherein the urea temperature difference can be determined according to formula (2):
ΔT＝|T1-T2|(2)；
wherein, Delta T is the temperature difference of urea, T1Is the first urea temperature, T2Is the second urea temperature.
For example, if the reference urea concentration is a, the actual urea temperature in the previous cycle is B. The second preset threshold is 1 degree celsius.
And if the determined urea temperature difference is 0.5 ℃, determining that the urea temperature difference is not greater than the second preset threshold. The actual urea concentration for this cycle is a.
And if the determined urea temperature difference is 2 ℃, determining that the urea temperature difference is greater than the second preset threshold value. The actual urea temperature for this cycle is B.
Therefore, whether floating ice or bubbles exist or not is judged by comparing the urea temperature difference value with a second preset threshold value, and the actual urea temperature of the period is determined according to the comparison result. Thereby improving the accuracy of the detection result.
In one embodiment, if it is determined that the urea concentration difference is greater than the first preset threshold, the reference urea concentration is determined as the actual urea concentration of the present cycle.
For example, if the first predetermined threshold is 1. The reference urea concentration is A, and the actual urea temperature in the previous period is B. Wherein:
if the urea temperature difference is 0.8, it is determined that the urea temperature difference is not greater than the first preset threshold, and step 103 is executed to determine the actual urea concentration of the present period.
And if the urea temperature difference is 3, determining that the urea temperature difference is greater than the first preset threshold value, and determining that the actual urea concentration in the period is B.
Therefore, whether the urea concentration needs to be further judged or not is determined through the urea concentration difference, when the urea concentration difference is determined to be larger than the first preset threshold, the actual urea concentration of the period can be directly output, and the urea concentration does not need to be further determined, so that the calculation amount is saved.
It should be noted that the first preset threshold and the second preset threshold in the present disclosure may be the same or different, and may be specifically set according to actual situations, and the present disclosure is not limited herein.
To sum up, the beneficial effect of this disclosure: when the urea concentration difference is determined to be not greater than the first preset threshold, the actual temperature of the period is determined through the temperature of urea in the urea box (the first urea temperature) and the temperature of reference urea concentration (the second urea temperature), and therefore whether floating ice, bubbles and the like exist in the urea box or not is determined according to the first urea temperature and the second urea temperature, the influence on the measurement of the urea concentration due to the existence of the floating ice, the bubbles and the like is avoided, and the accuracy of the urea concentration detection result is improved.
For further understanding of the technical solution of the present disclosure, the following detailed description with reference to fig. 2 may include the following steps:
step 201: determining that there is no fault with a urea quality sensor for determining a reference urea concentration;
step 202: periodically acquiring reference urea concentration in a urea box;
step 203: determining a urea concentration difference value according to the reference urea concentration and the actual urea concentration of the previous period;
step 204: judging whether the urea concentration difference value is larger than a first preset threshold value, if so, executing a step 205; if not, go to step 206;
step 205: determining the reference urea concentration as an actual urea concentration for the cycle;
step 206: determining a urea temperature difference value according to the first urea temperature and the second urea temperature; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration;
step 207: judging whether the urea temperature difference is larger than a second preset threshold value, if so, executing a step 208, and if not, executing a step 209;
step 208: determining the reference urea concentration as an actual urea concentration for the cycle;
step 209: and determining the actual urea temperature of the previous period as the actual urea temperature of the period.
The following describes the specific steps of the present disclosure in detail by taking the first preset threshold as 1 and the second preset threshold as 1 as an example:
and periodically acquiring the reference urea concentration in the urea box, determining the reference urea concentration to be A through a urea quality sensor, and if the actual urea concentration in the previous period is B.
And if the urea concentration difference is determined to be 0.5, determining a urea temperature difference according to the first urea temperature and the second urea temperature, and if the urea temperature difference is determined to be 2, determining the urea reference concentration A as the actual urea concentration of the period. And if the urea temperature difference is determined to be 0.6, determining the urea reference concentration B as the actual urea concentration of the period.
And if the urea concentration difference is determined to be 2, determining the reference urea concentration A as the actual urea concentration of the period.
The method for determining the urea concentration according to the present disclosure may also be implemented by a device for determining the urea concentration based on the same disclosed concept. The effect of the device for determining the urea concentration is similar to that of the method described above and will not be described in detail herein.
Fig. 3 is a schematic configuration diagram of a urea concentration determination apparatus according to an embodiment of the present disclosure.
As shown in FIG. 3, the urea concentration determination apparatus 300 of the present disclosure may include a reference urea concentration obtaining module 310, a first comparing module 320, and a first actual urea concentration determination module 330.
A reference urea concentration obtaining module 310 for periodically obtaining a reference urea concentration in the urea tank;
a first comparing module 320, configured to determine a urea concentration difference according to the reference urea concentration and an actual urea concentration of a previous period, and compare the urea concentration difference with a first preset threshold;
a first actual urea concentration determining module 330, configured to determine an actual urea concentration of the period according to the first urea temperature and the second urea temperature if it is determined that the urea concentration difference is not greater than the first preset threshold; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration.
In one embodiment, the apparatus further comprises:
the second actual urea concentration determining module 340 is configured to determine the reference urea concentration as the actual urea concentration of the present period if it is determined that the urea concentration difference is greater than the first preset threshold.
In one embodiment, the first actual urea concentration determination module 330 is specifically configured to:
determining a urea temperature difference value according to the first urea temperature and the second urea temperature;
if the urea temperature difference is larger than a second preset threshold, determining the reference urea concentration as the actual urea concentration of the period;
and if the urea temperature difference is not greater than the second preset threshold, determining the actual urea temperature in the previous period as the actual urea temperature in the current period.
In one embodiment, the apparatus further comprises:
a urea temperature difference determination module 350 configured to determine a urea temperature difference according to:
determining an absolute value of a difference between the first urea temperature and the second urea temperature as the urea temperature difference;
a urea concentration difference determination module 360 configured to determine the urea concentration difference according to the following:
and determining the absolute value of the difference value between the reference urea concentration and the actual urea concentration of the previous period as the urea concentration difference value.
In one embodiment, the reference urea concentration is determined by a urea quality sensor; the device further comprises:
a fault detection module 370 to determine that the urea quality sensor is not faulty before the period obtains the reference urea concentration in the urea tank.
After describing a method and apparatus for determining a urea concentration according to an exemplary embodiment of the present disclosure, an electronic device according to another exemplary embodiment of the present disclosure will be described.
As will be appreciated by one skilled in the art, aspects of the present disclosure may be embodied as a system, method or program product. Accordingly, various aspects of the present disclosure may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
In some possible implementations, an electronic device in accordance with the present disclosure may include at least one processor, and at least one computer storage medium. Wherein the computer storage medium has stored program code which, when executed by the processor, causes the processor to perform the steps of the method of determining urea concentration according to various exemplary embodiments of the present disclosure described above in this specification. For example, the processor may perform steps 101-103 as shown in FIG. 1.
An electronic device 400 according to this embodiment of the disclosure is described below with reference to fig. 4. The electronic device 400 shown in fig. 4 is only an example and should not bring any limitations to the functionality and scope of use of the embodiments of the present disclosure.
As shown in fig. 4, the electronic device 400 is represented in the form of a general electronic device. The components of electronic device 400 may include, but are not limited to: the at least one processor 401, the at least one computer storage medium 402, and the bus 403 that connects the various system components (including the computer storage medium 402 and the processor 401).
Bus 403 represents one or more of any of several types of bus structures, including a computer storage media bus or computer storage media controller, a peripheral bus, a processor, or a local bus using any of a variety of bus architectures.
The computer storage medium 402 may include readable media in the form of volatile computer storage media, such as random access computer storage media (RAM)421 and/or cache storage media 422, and may further include read-only computer storage media (ROM) 423.
The computer storage medium 402 may also include a program/utility 425 having a set (at least one) of program modules 424, such program modules 424 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
In some possible embodiments, aspects of a method for determining a urea concentration provided by the present disclosure may also be embodied in the form of a program product comprising program code for causing a computer device to perform the steps of the method for determining a urea concentration according to various exemplary embodiments of the present disclosure described above in this specification, when the program product is run on the computer device.
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 computer storage media (RAM), a read-only computer storage media (ROM), an erasable programmable read-only computer storage media (EPROM or flash memory), an optical fiber, a portable compact disc read-only computer storage media (CD-ROM), an optical computer storage media piece, a magnetic computer storage media piece, or any suitable combination of the foregoing.
The program product for urea concentration determination of embodiments of the present disclosure may employ a portable compact disc read-only computer storage medium (CD-ROM) and include program code, and may be executable on an electronic device. However, the program product of the present disclosure is not limited thereto, 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 for the present disclosure may be written in any combination of one or more programming languages, including an object oriented 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 consumer electronic device, partly on the consumer electronic device, as a stand-alone software package, partly on the consumer electronic device and partly on a remote electronic device, or entirely on the remote electronic device or server. In the case of remote electronic devices, the remote electronic devices may be connected to the consumer electronic device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external electronic device (e.g., through the internet using an internet service provider).
It should be noted that although several modules of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the modules described above may be embodied in one module, in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module described above may be further divided into embodiments by a plurality of modules.
Further, while the operations of the disclosed methods 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 disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk computer storage media, CD-ROMs, optical computer storage media, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present disclosure. 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 data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data 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 computer storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable computer storage medium 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 data 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.
It will be apparent to those skilled in the art that various changes and modifications can be made in the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations as well.
Claims (12)
1. A method for determining a urea concentration, wherein the method is used for detecting the urea concentration in a urea tank of an automobile, and the method comprises the following steps:
periodically acquiring reference urea concentration in a urea box;
determining a urea concentration difference value through the reference urea concentration and the actual urea concentration of the previous period, and comparing the urea concentration difference value with a first preset threshold value;
if the urea concentration difference is not larger than the first preset threshold value, determining the actual urea concentration of the period according to the first urea temperature and the second urea temperature; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration.
2. The method of claim 1, further comprising:
and if the urea concentration difference is determined to be larger than the first preset threshold, determining the reference urea concentration as the actual urea concentration of the period.
3. The method of claim 1, wherein determining the actual urea concentration for the cycle based on the first urea temperature and the second urea temperature comprises:
determining a urea temperature difference value according to the first urea temperature and the second urea temperature;
if the urea temperature difference is larger than a second preset threshold, determining the reference urea concentration as the actual urea concentration of the period; or the like, or, alternatively,
and if the urea temperature difference is not greater than the second preset threshold, determining the actual urea temperature in the previous period as the actual urea temperature in the current period.
4. Method according to claim 1, characterized in that the urea temperature difference is determined according to the following:
determining an absolute value of a difference between the first urea temperature and the second urea temperature as the urea temperature difference; and/or the presence of a gas in the gas,
determining the urea concentration difference according to the following mode:
and determining the absolute value of the difference value between the reference urea concentration and the actual urea concentration of the previous period as the urea concentration difference value.
5. The method according to any one of claims 1 to 4, wherein the reference urea concentration is determined by a urea quality sensor;
before the period obtains the reference urea concentration in the urea box, the method further comprises the following steps:
determining that the urea quality sensor is not faulty.
6. A urea concentration determining apparatus for detecting a concentration of urea in a urea tank of an automobile, the apparatus comprising:
the reference urea concentration acquisition module is used for periodically acquiring reference urea concentration in the urea box;
the first comparison module is used for determining a urea concentration difference value according to the reference urea concentration and the actual urea concentration of the previous period, and comparing the urea concentration difference value with a first preset threshold value;
the first actual urea concentration determining module is used for determining the actual urea concentration of the period according to the first urea temperature and the second urea temperature if the urea concentration difference is determined not to be larger than the first preset threshold; wherein the first urea temperature is a temperature of urea in the urea tank, and the second urea temperature is a temperature of the reference urea concentration.
7. The apparatus of claim 6, further comprising:
and the second actual urea concentration determining module is used for determining the reference urea concentration as the actual urea concentration of the period if the urea concentration difference is determined to be greater than the first preset threshold.
8. The apparatus of claim 6, wherein the first actual urea concentration determination module is specifically configured to:
determining a urea temperature difference value according to the first urea temperature and the second urea temperature;
if the urea temperature difference is larger than a second preset threshold, determining the reference urea concentration as the actual urea concentration of the period; or the like, or, alternatively,
and if the urea temperature difference is not greater than the second preset threshold, determining the actual urea temperature in the previous period as the actual urea temperature in the current period.
9. The apparatus of claim 6, further comprising:
a urea temperature difference determination module for determining a urea temperature difference according to the following:
determining an absolute value of a difference between the first urea temperature and the second urea temperature as the urea temperature difference;
a urea concentration difference determination module configured to determine the urea concentration difference according to:
and determining the absolute value of the difference value between the reference urea concentration and the actual urea concentration of the previous period as the urea concentration difference value.
10. The apparatus according to any one of claims 6 to 9, wherein the reference urea concentration is determined by a urea quality sensor; the device further comprises:
a fault detection module to determine that the urea quality sensor is not faulty before the reference urea concentration in the urea tank is periodically obtained.
11. An electronic device comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions for execution by the at least one processor; the instructions are executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-5.
12. A computer storage medium, characterized in that the computer storage medium stores a computer program for performing the method according to any one of claims 1-5.
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