CN113283719A - Nitrogen oxide emission characteristic analysis method, equipment and computer readable storage medium - Google Patents
Nitrogen oxide emission characteristic analysis method, equipment and computer readable storage medium Download PDFInfo
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 594
- 238000004458 analytical method Methods 0.000 title claims description 19
- 238000000034 method Methods 0.000 claims abstract description 46
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 28
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- 239000007788 liquid Substances 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
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- 239000007789 gas Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
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- 238000012935 Averaging Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
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- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
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- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a method, equipment and a computer readable storage medium for analyzing the emission characteristics of nitrogen oxides, wherein the method comprises the following steps: acquiring nitrogen oxide emission data of a vehicle to be evaluated within a set time period; calculating the frequency of the emission of nitrogen oxides with various concentrations in the emission data; and judging the nitrogen oxide emission performance of the vehicle to be evaluated according to the frequency. The technical scheme disclosed by the invention is that the nitrogen oxide emission performance of the vehicle to be evaluated is judged according to the frequency of the emission of nitrogen oxides with various concentrations, and the obtained result is slightly influenced by the distortion severity of the emission data, so that compared with the scheme for judging the emission performance of the vehicle according to the emission of the nitrogen oxides, the accuracy of the result is higher.
Description
Technical Field
The present disclosure relates generally to the field of vehicle nox emission characterization techniques. More particularly, the present disclosure relates to a nitrogen oxide emission characteristic analysis method, apparatus, and computer-readable storage medium.
Background
At present, diesel oil or gasoline is mainly used as an energy source for an engine of a vehicle to provide power for the vehicle. When gasoline or diesel oil is combusted in the combustion chamber, air is required for supporting combustion, and nitrogen and oxygen in the air can also generate a series of chemical reactions and generate oxynitride in the high-temperature environment of the combustion chamber. When the oxynitride is discharged into the air, the oxynitride is combined with moisture in the air and converted into nitric acid or nitrate, and the nitric acid is one of components of acid rain; in addition, nitrogen oxides can also combine with other pollutants to form photochemical smog. It is known that nitrogen oxides in vehicle exhaust gas can seriously affect the environmental quality.
In order to reduce the pollution of nitrogen oxide in the vehicle exhaust to the environment, many countries and regions have strict requirements on the concentration of nitrogen oxide in the vehicle exhaust, that is, when the concentration of nitrogen oxide in the vehicle exhaust exceeds a certain standard, the vehicle is prohibited from being used. In order to determine whether the product meets the emission requirements, the vehicle manufacturer needs to evaluate the nitrogen oxide emission performance of the product. The existing evaluation method for the nitrogen oxide emission performance of the vehicle comprises the following steps: detecting the emission amount of nitrogen oxides of the vehicle, and obtaining the evaluation result of the emission performance of the nitrogen oxides of the vehicle according to the emission amount: the emission performance of the nitrogen oxide is poor when the emission amount of the nitrogen oxide of the vehicle is large, and the emission performance of the nitrogen oxide is good when the emission amount of the nitrogen oxide of the vehicle is small. Although the evaluation method can judge the oxynitride discharge performance of the vehicle, the accuracy of the judgment result depends on the accuracy and the integrity of the detection data, and if part of the detection data has errors due to the influence of the environment on the detection equipment or the detection data is lost due to the abnormal communication connection in the transmission process, the obtained oxynitride discharge performance of the vehicle is not accurate.
In conclusion, the existing analysis of the nitrogen oxide emission performance of the vehicle has the problem of inaccuracy.
Disclosure of Invention
The present disclosure provides a nox emission characteristic analysis scheme to at least solve the above-mentioned problem of inaccurate existing nox emission characteristic analysis.
In order to solve the above problems, the present disclosure provides the following technical solutions:
a nitrogen oxide emission characteristic analysis method comprises the following steps: acquiring nitrogen oxide emission data of a vehicle to be evaluated within a set time period; calculating the frequency of the emission of nitrogen oxides with various concentrations in the emission data; and judging the nitrogen oxide emission performance of the vehicle to be evaluated according to the frequency.
In one embodiment, the frequency of occurrence within the emission of oxides of nitrogen of each concentration in the emission data is: the ratio of the number of occurrences of the corresponding concentration of nitrogen oxide emissions in the emission data to the total number of occurrences of all concentration of nitrogen oxide emissions in the emission data.
In one embodiment, before obtaining the data of nitrogen oxide emission of the vehicle to be evaluated in the set time period, the method further comprises the following steps: judging whether the vehicle to be evaluated is a fault vehicle; and if the vehicle is a non-fault vehicle, acquiring nitrogen oxide emission data of the vehicle to be evaluated within a set time period.
In one embodiment, before obtaining the data of nitrogen oxide emission of the vehicle to be evaluated in the set time period, the method further comprises the following steps: acquiring the liquid level of the urea box of the vehicle to be evaluated; judging whether the liquid level of the urea box of the vehicle to be evaluated is lower than a set liquid level value or not; and if not, acquiring the nitrogen oxide emission data of the vehicle to be evaluated in the set time period.
In one embodiment, the step of obtaining the data of nitrogen oxide emission of the vehicle to be evaluated in the set period of time comprises the following steps: judging whether a starting signal of the vehicle to be evaluated is received, if so, judging that the vehicle to be evaluated starts to run, and starting to acquire the running mileage and the temperature of a water tank; judging whether the driving mileage of the vehicle to be evaluated after the vehicle starts to drive is larger than a set mileage and whether the temperature of a water tank of the vehicle to be evaluated is larger than the set temperature; if the driving mileage of the vehicle to be evaluated after the starting is larger than the set mileage and the temperature of the water tank is larger than the set temperature, the nitrogen oxide emission data of the vehicle to be evaluated is obtained; and judging whether a stop signal of the vehicle to be evaluated is received or not, and if so, stopping acquiring nitrogen oxide emission data of the vehicle.
In one embodiment, the obtaining of the data on the nitrogen oxide emissions of the vehicle to be assessed for the set period of time comprises: acquiring a nitrogen oxide emission factor and a driving mileage of the vehicle to be evaluated within the set time period; and calculating the nitrogen oxide emission data of the vehicle to be evaluated in the set time period according to the nitrogen oxide emission factor and the driving mileage.
Further, in one embodiment, the method for obtaining the nitrogen oxide emission factor of the vehicle to be evaluated comprises the following steps: obtaining OBD data of the vehicle to be evaluated; and obtaining the nitrogen oxide emission factor of the vehicle to be evaluated according to the OBD data of the vehicle to be evaluated.
Further, in one embodiment, the method further comprises the following steps: and after the nitrogen oxide emission data of the vehicle to be evaluated in the set time period are obtained, performing sliding mean processing on the vehicle to be evaluated.
In another aspect, the present disclosure provides a nox emission characteristics analyzing apparatus, including a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface are communicated with each other via the communication bus; the memory is configured to store at least one executable instruction that causes the processor to perform the nitrogen oxide emission characterization method and various embodiments thereof.
In another aspect, the present disclosure provides a computer-readable storage medium having stored thereon computer program instructions for execution by one or more processors to implement the nox emission characteristic analysis method and embodiments thereof.
According to the technical scheme provided by the disclosure, the frequency of the emission of the nitrogen oxides with various concentrations in the emission data of the nitrogen oxides of the vehicle to be evaluated in a set time period is calculated, and then the emission performance of the nitrogen oxides of the vehicle to be evaluated is judged according to the frequency. Compared with the scheme of judging the emission performance of the vehicle only according to the emission amount of the nitrogen oxides, the technical scheme of the invention can reflect the change trend of the emission of the nitrogen oxides in the time domain, not only provides a unique analysis angle, but also more objectively and truly reflects the emission performance of the vehicle; on the other hand, if some data in the emission data are seriously distorted, the accuracy of a scheme for analyzing the emission performance according to the emission amount is greatly influenced; by adopting the technical scheme disclosed by the invention, the influence of the severity of the distortion degree of the emission data on the final analysis result is small. Therefore, the method and the device can reduce the influence caused by the distortion of the detection data, and the accuracy of the obtained result is higher.
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The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic flow chart diagram of a method for analyzing nox emission characteristics according to an embodiment of the present disclosure.
FIG. 2 is a schematic flow chart diagram of a method for calculating the frequency of occurrence of NOx emissions for various concentrations in emission data, according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a process for determining a fault in a vehicle to be assessed according to an embodiment of the disclosure;
FIG. 4 is a schematic flow chart illustrating a process for determining whether a urea solution is present in a urea tank of a vehicle to be assessed according to an embodiment of the disclosure;
FIG. 5 is a schematic flow chart illustrating a process for obtaining vehicle nitrogen oxide emission data to be assessed over a set period of time according to an embodiment of the present disclosure;
FIG. 6 is a schematic flow chart illustrating a process for obtaining NOx emission data for a vehicle to be assessed over a set period of time according to an embodiment of the present disclosure;
FIG. 7 is a schematic flow chart diagram of a method for obtaining a NOx emission factor of a vehicle to be assessed according to an embodiment of the present disclosure;
FIG. 8 is a flow chart illustrating an emission data averaging process according to an embodiment of the present disclosure;
FIG. 9 is a graphical illustration of nitrogen oxide emission data in accordance with an embodiment of the present disclosure; and
fig. 10 is a schematic structural diagram of a nitrogen oxide emission characteristic analysis apparatus according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below 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.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a nox emission characteristic analysis method, which includes:
and step S1, acquiring nitrogen oxide emission data of the vehicle to be evaluated in a set time period. In the present embodiment, the set time period is two months, and in other embodiments, the length of the set time period may be increased or decreased according to actual needs. And those skilled in the art should understand that the nitrogen oxide in the present embodiment refers to nitrogen oxide generated by the chemical reaction of oxygen and nitrogen in the air as combustion improver under the high temperature environment of the combustion chamber when the operation of the vehicle engine is to be evaluated, and includes but is not limited to nitrogen dioxide.
Step S2, the frequency of occurrence of the nitrogen oxide emission amount of each concentration in the nitrogen oxide emission data of the vehicle to be evaluated within a set period of time is calculated. In step S2 of this embodiment, the nox emission is divided into a high nox emission, which is greater than a first set concentration value, a medium nox emission, which is less than the first set concentration value and greater than a second set concentration value, and a low nox emission, which is less than the second set concentration value, the first set concentration value being greater than the second set concentration value. Accordingly, the frequency acquired in step S2 includes the step S1 acquiring the frequency of occurrence of the high concentration nitrogen oxide emission amount, the frequency of occurrence of the medium concentration nitrogen oxide emission amount, and the frequency of occurrence of the low concentration nitrogen oxide in the nitrogen oxide emission data.
In other embodiments, the nitrogen oxide emission amount may be divided into other more or less concentration emission amounts, such as only the high concentration nitrogen oxide emission amount and the low concentration nitrogen oxide emission amount, and accordingly the frequency obtained in this step at this time includes the frequency of occurrence of the high concentration nitrogen oxide emission amount and the frequency of occurrence of the low concentration nitrogen oxide emission amount in the step S1 of obtaining the nitrogen oxide emission data; if the discharge amount of the first concentration nitrogen oxide, the discharge amount of the second concentration nitrogen oxide, the discharge amount of the third concentration nitrogen oxide, and the discharge amount of the fourth concentration nitrogen oxide are divided, and each discharge amount of the concentration nitrogen oxide is respectively provided with a corresponding threshold, the frequency obtained in the step correspondingly includes the frequency of the discharge amount of the first concentration nitrogen oxide, the frequency of the discharge amount of the second concentration nitrogen oxide, the frequency of the discharge amount of the third concentration nitrogen oxide, and the frequency of the discharge amount of the fourth concentration nitrogen oxide in the nitrogen oxide discharge data obtained in step S1. From the above, those skilled in the art can easily understand that in practical application scenarios, the nox emission can be divided into required levels according to needs, and the present disclosure does not limit this. For convenience of explanation, the following examples will be explained based on the emission of high, medium and low concentration nitrogen oxides.
And step S3, judging the nitrogen oxide emission performance of the vehicle to be evaluated according to the frequency of the nitrogen oxide emission amount of each concentration in the nitrogen oxide emission data of the vehicle to be evaluated in a fixed time period. As will be understood by those skilled in the art, the emission performance of the vehicle nitrogen oxide to be evaluated is inversely related to the frequency of occurrence of the high concentration nitrogen oxide emission, that is, the frequency of occurrence of the high concentration nitrogen oxide emission is high when the emission performance of the vehicle nitrogen oxide is poor, and the frequency of occurrence of the high concentration nitrogen oxide emission is low when the emission performance of the vehicle nitrogen oxide is good.
According to the above, the technical solution disclosed in the present embodiment can determine the nox emission performance according to the frequency of the nox emission amount of each concentration of the vehicle to be evaluated in a set time period. Compared with the existing scheme of judging the emission performance of the vehicle according to the emission amount of nitrogen oxides of the vehicle, the scheme disclosed by the embodiment has the advantages that: in the acquired emission data of the vehicle to be evaluated, if certain data is seriously distorted, if certain emission data is much larger than an actual value or much smaller than the actual value, when the emission performance of the vehicle is judged, the obtained result is influenced by the distorted data and is deviated or better than the actual emission performance of the vehicle; by adopting the technical scheme disclosed in this embodiment, the distortion data only affects the number of times of occurrence of certain emission data (for example, the number of times of occurrence of high-concentration nitrogen oxide emission data is increased by 1 or decreased by 1) no matter whether the distortion degree is serious or not, and the influence on the final judgment result is small. Therefore, compared with the existing scheme, the technical scheme disclosed by the embodiment can reduce the influence of the detection data distortion degree on the judgment result, and the obtained judgment result has higher accuracy. In other words, the technical scheme disclosed by the embodiment can reflect the variation trend of the nitrogen oxide emission in the time domain, not only provides a unique analysis angle, but also reflects the vehicle emission performance more objectively and truly.
In one embodiment, fig. 2 shows a flowchart of calculating the occurrence frequency of nox emissions of each concentration in step S2, where the calculating method includes:
step S201, acquiring the times of the emission of high-concentration nitrogen oxides, the times of the emission of medium-concentration nitrogen oxides and the times of the emission of low-concentration nitrogen oxides in the nitrogen oxide emission data of the vehicle to be evaluated in a set time period. In the embodiment, a plurality of detection cycles are set in the set time period, and the nitrogen oxide emission data of the vehicle to be evaluated in the set time period comprises the nitrogen oxide emission amount of each detection cycle of the vehicle to be evaluated in the set time period. In the nitrogen oxide emission data of the vehicle to be evaluated in the set time period, if the concentration of the nitrogen oxide emission in L detection periods is P, the frequency of occurrence of the nitrogen oxide with the concentration of P in the nitrogen oxide emission data of the vehicle to be evaluated in the set time period is L. In executing this step S201, the number of times that the emission amount of nitrogen oxides larger than the first set concentration value in the emission data acquired in step S1 occurs is taken as the number of times that the emission amount of nitrogen oxides of high concentration occurs, the number of times that the emission amount of nitrogen oxides smaller than the first set concentration value and larger than the second set concentration value occurs is taken as the number of times that the emission amount of nitrogen oxides of low concentration occurs, and the number of times that the emission amount of nitrogen oxides of low concentration occurs is taken as the number of times that the emission amount of nitrogen oxides of low concentration occurs.
And step S202, calculating the sum of the times of the high-concentration nitrogen oxide emission, the times of the medium-concentration nitrogen oxide emission and the times of the low-concentration nitrogen oxide emission, and taking the sum as the total times of the nitrogen oxide emission of each concentration of the nitrogen oxide emission data of the vehicle to be evaluated in a set time period.
Step S203, respectively calculating the ratio of the number of times of low-concentration nitrogen oxides appearing, the number of times of medium-concentration nitrogen oxides appearing, the number of times of high-concentration nitrogen oxides appearing and the total number of times of emission of the high-concentration nitrogen oxides appearing in the nitrogen oxide emission data of the vehicle to be evaluated in the set time period, and respectively taking the ratio as the frequency of low-concentration nitrogen oxides emission appearing, the frequency of medium-concentration nitrogen oxides emission appearing and the frequency of high-concentration nitrogen oxides emission appearing in the nitrogen oxide emission data of the vehicle to be evaluated in the set time period.
In one embodiment, before step S1 is executed, whether the vehicle to be evaluated is a faulty vehicle is determined, and a simplified flow of the determining method is shown in fig. 3, where the method includes:
and S001, judging whether the vehicle to be evaluated sends out an alarm signal or not, if so, judging that the vehicle to be evaluated is a fault vehicle, otherwise, judging that the vehicle to be evaluated is a non-fault vehicle. That is, in this embodiment, whether the vehicle to be evaluated has a fault is determined according to the signal of the fault indicator lamp of the vehicle to be evaluated, and since the fault indicator lamp of the vehicle to be evaluated sends an alarm signal when the vehicle to be evaluated has a fault, the method can quickly determine whether the vehicle to be evaluated is a faulty vehicle; as another embodiment, other methods may be adopted to determine whether the vehicle to be evaluated is a faulty vehicle, such as determining whether the vehicle is a faulty vehicle by receiving a signal from the vehicle controller thereof.
In step S002, if the vehicle to be evaluated is a non-faulty vehicle, step S1 is executed.
The effect of the present embodiment is that, since the nox emission data of the vehicle to be evaluated in the failure state is inconsistent with the nox emission data in the non-failure state, the present embodiment determines whether the vehicle to be evaluated is a failed vehicle before executing step S1, so that the influence of the failure of the vehicle to be evaluated on the nox emission performance determination result can be eliminated, and the accuracy of obtaining the nox emission performance of the vehicle to be evaluated can be further improved.
In yet another embodiment, before executing step S1, a method for determining whether a urea solution is present in a urea tank of a vehicle to be assessed is simplified as shown in FIG. 4, and includes:
and S011, acquiring the liquid level of the urea tank of the vehicle to be evaluated, wherein the liquid level is acquired by receiving a liquid level sensor arranged in the urea tank.
Step S012, judging whether the liquid level of the vehicle urea box to be evaluated is lower than a set liquid level value; if not, step S1 is executed.
The effect of this embodiment is: the urea tank on the vehicle to be evaluated is internally provided with a urea solution which can chemically react with nitrogen oxides in the tail gas of the vehicle to be evaluated so as to reduce the concentration of the nitrogen oxides, so that the urea tank is a device for reducing the emission of the nitrogen oxides of the vehicle to be evaluated; when the amount of the urea solution in the urea tank is too small, the urea solution cannot absorb the nitrogen oxides in the exhaust gas of the vehicle to be evaluated, so that the emission amount of the nitrogen oxides of the vehicle to be evaluated is increased, and the accuracy of the judgment result of the nitrogen oxide emission performance of the vehicle to be evaluated is influenced. In the present embodiment, the set level value in step S012 is zero, that is, step S1 is executed when there is urea solution in the urea tank; as another embodiment, in order to prevent the problem that the amount of nitrogen oxide emissions of the vehicle to be evaluated increases due to the decrease in the absorption capacity of the urea solution in the urea tank due to an excessively small amount of urea solution, the set level value may be set to other values greater than zero. As can be seen from the above, in the present embodiment, before step S1 is executed, it is determined whether there is urea solution in the urea tank of the vehicle to be evaluated, so that errors caused by too low amount of urea solution can be reduced, and the accuracy of the determination result of the nox emission performance of the vehicle to be evaluated is improved.
In another embodiment of the present disclosure, a method as shown in fig. 5 is used to obtain data of nitrogen oxide emission of a vehicle to be evaluated in a set time period, where the method includes:
and step S101, judging whether a starting signal of the vehicle to be evaluated is received or not, and if so, judging that the vehicle to be evaluated starts to run.
And step S102, when the vehicle to be evaluated starts to run, acquiring the running mileage and the temperature of the water tank. In other embodiments, the driving range of the vehicle to be assessed can be obtained according to the position information, that is, the position information of the vehicle to be assessed is obtained through a positioning device on the vehicle to be assessed, and the driving range of the vehicle to be assessed is obtained according to the distance of the position change of the vehicle to be assessed.
And step S103, judging whether the driving mileage of the vehicle to be evaluated after the vehicle starts to drive is larger than the set mileage and whether the temperature of a water tank of the vehicle is larger than the set temperature. In the present embodiment, the set mileage is two kilometers, and the set temperature is 70 degrees celsius, but as another embodiment, the set mileage and the set temperature may be changed to other values.
And step S104, if the driving mileage of the vehicle to be evaluated after the vehicle starts to drive is larger than the set mileage and the temperature of the water tank of the vehicle to be evaluated is larger than the set temperature, the nitrogen oxide emission data of the vehicle to be evaluated is started to be acquired.
And step S105, judging whether a stop signal of the vehicle to be evaluated is received, and if the stop signal is received, stopping acquiring the nitrogen oxide emission data of the vehicle to be evaluated.
According to the above, the method for acquiring the nitrogen oxide emission data of the vehicle to be evaluated in the set time period disclosed in this embodiment can determine that the vehicle to be evaluated enters the stable operation state when the vehicle to be evaluated travels the set mileage and the water tank temperature reaches the set temperature value, and then acquire the nitrogen oxide emission data of the vehicle to be evaluated, so that the influence of abnormal data on the determination result of the nitrogen oxide emission performance of the vehicle to be evaluated can be reduced, and the accuracy of the determination of the nitrogen oxide emission performance of the vehicle to be evaluated can be further improved.
In one embodiment of the present disclosure, fig. 6 shows a schematic flow chart for obtaining nox emission data of a vehicle to be assessed for a set period of time, the method comprising:
and step S111, acquiring nitrogen oxide emission factors and driving mileage of the vehicle to be evaluated in each detection period of the set time period. The detection period in the embodiment is 30 seconds, namely the nitrogen oxide emission factor and the driving mileage of the vehicle to be evaluated are obtained every 30 seconds; the nitrogen oxide emission factor refers to the nitrogen oxide emission of the vehicle to be evaluated in each kilometer; the driving mileage is obtained from an odometer of the vehicle to be evaluated.
And step S112, respectively calculating the nitrogen oxide emission amount of the vehicle in each detection period of the set time period according to the nitrogen oxide emission factor and the driving mileage of the vehicle to be evaluated in each detection period of the set time period.
In this embodiment, the nitrogen oxide emission factor obtained in step S111 is the nitrogen oxide emission amount of the vehicle to be evaluated in each kilometer, and therefore the nitrogen oxide emission factor of the vehicle to be evaluated in the detection period is multiplied by the driving mileage, and the obtained result is the nitrogen oxide emission amount of the vehicle to be evaluated in the detection period.
Further, in one embodiment, the nox emission factor of the vehicle to be assessed is obtained from OBD data of the vehicle, and a simplified flow chart of the obtaining method is shown in fig. 7, and includes:
and step S211, obtaining OBD data of the vehicle to be evaluated. The OBD data is data obtained from an OBD system, which is a vehicle fault diagnosis detection system for monitoring components such as a vehicle engine, a catalytic converter, a particulate trap, an oxygen sensor, an emission control system, a fuel system, etc. in real time, and can obtain the exhaust emission condition of the vehicle engine from the operating condition of the vehicle engine to be evaluated, and directly obtain the nitrogen oxide emission factor. In this embodiment, OBD data of the Vehicle to be evaluated is obtained, including a VIN code (frame Number), position information, a current Vehicle speed, a nitrogen oxide concentration, a water tank temperature, and a driving mileage of the Vehicle to be evaluated, and according to the VIN code of the Vehicle to be evaluated, the Vehicle type, the fuel type, and the emission stage are obtained by matching and searching in a registered Vehicle database.
And step S212, obtaining the nitrogen oxide emission factor of the vehicle according to the OBD data of the vehicle to be evaluated.
According to the scheme adopted by the embodiment, the nitrogen oxide emission factor is directly obtained according to the OBD data of the vehicle to be evaluated, the data volume for calculating the nitrogen oxide emission of the vehicle to be evaluated can be reduced, and the working efficiency is improved.
Further, in an embodiment, after the nox emission data of the vehicle to be evaluated within the set time period is obtained, the mean value processing is performed on the data, so as to reduce the influence of the distorted data on the determination result in step S3, and improve the accuracy of the nox emission performance of the vehicle to be evaluated. Assuming that the set time period of the embodiment has SUM detection cycles, taking an example of a method for processing an average value of nitrogen oxide emissions of an mth detection cycle, where SUM is a positive integer greater than 1 and m is a positive integer smaller than SUM, the method includes:
step S121, obtaining the emission amount of nitrogen oxides of the m-th to m + n-th detection periods of the vehicle to be evaluated in the set time, where n is a positive integer, the value of n in this embodiment is 29, and the emission amount of nitrogen oxides corresponding to the m + i-th detection period is Pm+iAnd i is an integer less than n and greater than 0.
And step S122, calculating the average value of the emission of the nitrogen oxides of the m-th to m + n-th detection periods of the vehicle to be evaluated in the set time, and taking the average value as the emission of the nitrogen oxides of the m-th period after the averaging treatment. Setting the average value of the emission of nitrogen oxides in the mth detection period as Pm', the calculation formula can be obtained as follows:
after the mean value processing is performed, even if a small amount of data in the acquired nitrogen oxide emission data of the vehicle to be evaluated is distorted within a set time period, the judgment of the nitrogen oxide emission performance of the vehicle to be evaluated is not influenced, so that the accuracy of the judgment of the nitrogen oxide emission performance of the vehicle to be evaluated can be further improved by the scheme disclosed by the embodiment.
As an embodiment of the present disclosure, in the above step S3, the method for determining the nox emission performance of the vehicle to be evaluated according to the frequency of occurrence of the high concentration nox emission in the nox emission data of the vehicle to be evaluated within the set period of time is: and judging whether the frequency of the high-concentration nitrogen oxide emission is greater than a set frequency value, and if so, judging that the emission performance of the vehicle to be evaluated is poor.
As another embodiment of the present disclosure, the following method may also be employed to judge the nox emission performance of the vehicle to be evaluated: in the step S1, acquiring nitrogen oxide emission data of a plurality of vehicles to be evaluated in a set time period; in the above step S2, the frequency of occurrence of the nitrogen oxide emission amount of each concentration in the nitrogen oxide emission data of each vehicle to be evaluated within the set time is calculated respectively; in step S3, the vehicles to be evaluated are ranked from small to large according to their high nox emission frequency, and in the obtained sequence, the vehicle to be evaluated that is ranked the front has the best nox emission performance, and the vehicle to be evaluated that is ranked the back has the worst nox emission performance. For example, as shown in fig. 9, for three vehicles to be evaluated, the data of the emission of nitrogen oxides is shown in fig. 9, the abscissa is the concentration of nitrogen oxides, and the ordinate is the probability density of the emission of nitrogen oxides at each concentration, that is, the frequency of the emission of nitrogen oxides at each concentration, wherein the frequency of the emission of nitrogen oxides at high concentration of one vehicle to be evaluated is significantly greater than that of the other two vehicles to be evaluated, so that the emission performance of nitrogen oxides of the vehicle to be evaluated is worse than that of the other two vehicles to be evaluated.
As will be understood by those skilled in the art from the above detailed description, in one embodiment of the present disclosure, the nox emission data of the vehicle to be evaluated in a set time period is obtained, then the frequency of occurrence of the nox emission of each concentration in the nox emission data is calculated, and the nox emission performance of the vehicle to be evaluated is determined according to the frequency, so that the accuracy of the nox emission performance of the vehicle to be evaluated can be improved. In other embodiments of the disclosure, it may be determined whether the vehicle to be evaluated is a faulty vehicle or whether there is urea solution in the urea tank, so as to reduce the influence on the determination result due to the fault of the vehicle or the shortage of urea solution. In another embodiment of the present disclosure, it may be determined whether the operation of the vehicle is stable according to the driving mileage of the vehicle to be evaluated and the temperature of the water tank, and when the operation of the vehicle is stable, the nitrogen oxide emission data of the vehicle may be obtained, which may further improve the accuracy of the determination result. In yet another embodiment of the present disclosure, the nox emission data of the vehicle to be assessed is calculated from its mileage and nox emission factor; further, the nitrogen oxide emission factor of the vehicle to be emitted is obtained according to the OBD data, and the data calculation amount can be reduced. And to further remove the effect of the abnormal data, in another embodiment of the present disclosure, after obtaining the nox emission data of the vehicle to be evaluated within a set period of time, it is further subjected to a sliding average process.
In another aspect, the present disclosure provides a nox emission characteristics analysis apparatus as illustrated in fig. 10, the apparatus including a processor, a memory, a communication interface, and a communication bus through which the processor, the memory, and the communication interface communicate with each other. The processor is used to provide computing and control capabilities. The memory includes a nonvolatile storage medium, an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the above-mentioned device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized by WIFI, an operator network, NFC (near field communication) or other technologies. The storage of the apparatus for analyzing nox emission characteristics provided by the present embodiment is used for storing at least one executable instruction, which causes the processor to execute the above method for analyzing nox emission characteristics and its various embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.
While various embodiments of the present disclosure have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present disclosure. It should be understood that various alternatives to the embodiments of the disclosure described herein may be employed in practicing the disclosure. It is intended that the following claims define the scope of the disclosure and that the module compositions, equivalents, or alternatives falling within the scope of these claims be covered thereby.
Claims (10)
1. A nitrogen oxide emission characteristic analysis method is characterized by comprising the following steps:
acquiring nitrogen oxide emission data of a vehicle to be evaluated within a set time period;
calculating the frequency of the emission of nitrogen oxides with various concentrations in the emission data;
and judging the nitrogen oxide emission performance of the vehicle to be evaluated according to the frequency.
2. The method of analyzing emission characteristics of nitrogen oxides according to claim 1, wherein the frequency of occurrence in the emission data for each concentration of nitrogen oxides is: the ratio of the number of occurrences of the corresponding concentration of nitrogen oxide emissions in the emission data to the total number of occurrences of all concentration of nitrogen oxide emissions in the emission data.
3. The method for analyzing nitrogen oxide emission characteristics according to claim 1, wherein before acquiring the nitrogen oxide emission data of the vehicle to be evaluated within the set period of time, the method further comprises the steps of:
judging whether the vehicle to be evaluated is a fault vehicle;
and if the vehicle is a non-fault vehicle, acquiring nitrogen oxide emission data of the vehicle to be evaluated within a set time period.
4. The method for analyzing nitrogen oxide emission characteristics according to claim 1, wherein before acquiring the nitrogen oxide emission data of the vehicle to be evaluated within the set period of time, the method further comprises the steps of:
acquiring the liquid level of the urea box of the vehicle to be evaluated;
judging whether the liquid level of the urea box of the vehicle to be evaluated is lower than a set liquid level value or not;
and if not, acquiring the nitrogen oxide emission data of the vehicle to be evaluated in the set time period.
5. The method for analyzing nitrogen oxide emission characteristics according to claim 1, wherein the step of obtaining the nitrogen oxide emission data of the vehicle to be evaluated within a set period of time comprises the steps of:
judging whether a starting signal of the vehicle to be evaluated is received, if so, judging that the vehicle to be evaluated starts to run, and starting to acquire the running mileage and the temperature of a water tank;
judging whether the driving mileage of the vehicle to be evaluated after the vehicle starts to drive is larger than a set mileage and whether the temperature of a water tank of the vehicle to be evaluated is larger than the set temperature;
if the driving mileage of the vehicle to be evaluated after the starting is larger than the set mileage and the temperature of the water tank is larger than the set temperature, the nitrogen oxide emission data of the vehicle to be evaluated is obtained;
and judging whether a stop signal of the vehicle to be evaluated is received or not, and if so, stopping acquiring nitrogen oxide emission data of the vehicle.
6. The nox emission characteristic analysis method according to claim 1, wherein the acquiring the nox emission data of the vehicle to be evaluated for the set period of time includes:
acquiring a nitrogen oxide emission factor and a driving mileage of the vehicle to be evaluated within the set time period;
and calculating the nitrogen oxide emission data of the vehicle to be evaluated in the set time period according to the nitrogen oxide emission factor and the driving mileage.
7. The nitrogen oxide emission characteristic analysis method according to claim 6, wherein the method of obtaining the nitrogen oxide emission factor of the vehicle to be evaluated includes:
obtaining OBD data of the vehicle to be evaluated;
and obtaining the nitrogen oxide emission factor of the vehicle to be evaluated according to the OBD data of the vehicle to be evaluated.
8. The nitrogen oxide emission characteristic analysis method according to claim 6, further comprising the steps of: and after the nitrogen oxide emission data of the vehicle to be evaluated in the set time period are obtained, performing sliding mean processing on the vehicle to be evaluated.
9. A nitrogen oxide emission characteristic analysis apparatus, comprising: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;
the memory is configured to store at least one executable instruction for execution by the processor to perform the operations of the method of any one of claims 1-8.
10. A computer-readable storage medium having computer program instructions stored thereon for execution by one or more processors to implement the method of any one of claims 1-8.
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