CN112682132B - Urea filling point urea quality analysis method based on remote monitoring platform of OBD system - Google Patents
Urea filling point urea quality analysis method based on remote monitoring platform of OBD system Download PDFInfo
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- 150000003672 ureas Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a urea filling point urea quality analysis method of a remote monitoring platform based on an OBD system, which comprises the steps of tracking the liquid level change of a vehicle urea box through engine data stream information uploaded by a vehicle-mounted terminal, reversely pushing the position point of the urea filling point by utilizing the fact that the liquid level change of the vehicle urea box exceeds a set position point, and considering the position point as the same urea filling point within a set range; after the position of a urea filling point is obtained, analyzing the NOx emission condition of all vehicles filling urea at the urea filling point; the real-time emission value of the NOx is the output value of the SCR downstream NOx sensor uploaded by the vehicle-mounted terminal; acquiring SCR inlet temperature and SCR outlet temperature of each vehicle, wherein the SCR inlet temperature is lower than or higher than a set threshold value, or the SCR outlet temperature is higher than the SCR inlet temperature, and judging that the real-time NOx emission value is the NOx emission condition of a vehicle filled with urea; and evaluating the urea quality according to the evaluation conditions, and feeding back the evaluation result.
Description
Technical Field
The invention provides a urea filling point urea quality analysis method based on a remote monitoring platform of an OBD system, and belongs to the technical field of urea quality analysis.
Background
OBD (on Board diagnostics) Chinese means a vehicle-mounted automatic diagnosis system, and the system can monitor the working conditions of an engine electric control system and other functional modules of a vehicle in real time in the running process of the vehicle, and judge that specific faults are stored in a memory in the system according to a specific algorithm if working conditions are abnormal. The role of OBD is currently mainly two: the device is used for providing a detection interface for maintenance personnel and measuring vehicle emission.
OBD vehicle terminal adopts OBD diagnostic technique, location technology (GPS or big dipper), GPRS mobile data communication technique simultaneously, and the mountable is on vehicle OBD diagnosis interface, incessant and vehicle driving computer carry out the communication, reads vehicle driving information, monitors vehicle operation index at any time, through thing networking card with data transmission to monitor platform to the realization is to vehicle remote tracking and diagnostic.
The information that OBD vehicle mounted terminal can gather includes OBD diagnostic data, vehicle real-time data stream, vehicle locating information. The OBD diagnosis data mainly comes from monitoring of a vehicle system, a sensor and the like, and the monitored support state and the corresponding fault code are obtained; the vehicle real-time data flow refers to main data in the running process of a vehicle, and comprises emission related data, such as vehicle speed, atmospheric pressure, engine torque, rotating speed of a transmitter, fuel flow of the transmitter, NOx emission, liquid level of a urea tank, air inflow, temperature of a catalytic reaction chamber, temperature of engine coolant, DPF pressure difference, liquid level of an oil tank, positioning state, longitude and latitude, accumulated mileage and other main data.
For a heavy-duty diesel vehicle, a vehicle real-time data stream acquired by an OBD vehicle-mounted terminal comprises key engine parameters and emission parameters generated in the driving process of the vehicle, and analysis and calculation are performed on part of the parameters, so that the influence of fuel used by the vehicle on NOx emission can be effectively analyzed. Along with the increasing deterioration of the environment, the country pays more and more attention to the environmental protection, and especially higher standard requirements are put forward for the emission control of vehicle exhaust, if urea with poor quality is used, the emission of NOx exceeds the standard, a driver of a heavy-duty diesel vehicle cannot easily distinguish the quality of the urea and does not have reference, so that a urea injection point with good urea quality is difficult to select for injecting the urea.
Disclosure of Invention
The invention provides a urea filling point urea quality analysis method based on a remote monitoring platform of an OBD system, which can evaluate the urea quality of a urea filling point and provide a reference basis, and adopts the following technical scheme:
the invention provides a urea filling point urea quality analysis method of a remote monitoring platform based on an OBD system, which comprises the following steps: step S10, tracking the liquid level change of a vehicle urea box through engine data flow information uploaded by a vehicle-mounted terminal, and reversely deducing the position point of the urea filling point by utilizing the fact that the liquid level change of the vehicle urea box exceeds a set position point, wherein the same urea filling point is considered within a set range of the position point; wherein the engine data stream information includes urea tank level, positioning status, longitude, and latitude; step S20, after the urea filling point position is obtained, analyzing NOx emission conditions of all vehicles filled with urea at the urea filling point; the real-time emission value of the NOx is the output value of the SCR downstream NOx sensor uploaded by the vehicle-mounted terminal; step S30, acquiring SCR inlet temperature and SCR outlet temperature of each vehicle, wherein the SCR inlet temperature is lower than or higher than a set threshold value, or the SCR outlet temperature is higher than the SCR inlet temperature, and determining that the real-time NOx emission value is the NOx emission condition of the vehicle filled with urea; and step S40, evaluating the quality of the urea according to the evaluation conditions, and feeding back the evaluation result.
Further, still include: and acquiring the actual urea injection amount and the urea tank liquid level of each vehicle, if the urea tank liquid level is lower than a set value, or the actual urea injection amount is zero or negative, and determining the abnormal NOx emission reason and positioning the vehicle according to the urea quality at the urea injection point.
Further, the step S10 of tracking the liquid level change of the vehicle urea tank through the engine data stream information uploaded by the vehicle-mounted terminal, and using the liquid level change of the vehicle urea tank to exceed the set position point to reversely estimate the urea filling point position point, where the urea filling points are considered to be the same within the set range of the position point, includes:
step S101, setting the percentage of the liquid level of a urea tank to be L in the engine data information flow uploaded by the vehicle A each timeiSCR downstream NOx sensor output value PiLongitude is XiLatitude of Yi；
Step S102, calculating the fluctuation difference delta L of the liquid level of the urea box of the vehicle A twice, and determining (X) if the delta L is more than 40%i+1，Yi+1) This point belongs to a urea dosing point; wherein Δ L ═ Li+1-Li；
Step S103, calculating to obtain a distance d taking longitude and latitude of two urea filling points as a fulcrum, if d is less than 500, marking the two urea filling points as one urea filling point, and defaulting the position of the urea filling point to be the longitude and latitude of the initial urea filling point (X)m，Ym) (ii) a The distance d between the two urea filling points with the longitude and latitude as the fulcrum is obtained by the following formula:
d＝R·arcos[cos(Ym)·cos(Yn)·cos(Xm-Xn)+sin(Ym)·sin(Yn)]
wherein, R represents the radius of the earth, and R is 6371.0 km; xm，YmAnd Xn，YnRespectively representing the longitude and latitude of two urea filling points.
Further, the analysis of NOx emissions from all vehicles that were filled with urea at this urea filling point described in step S20 includes:
step S201, screening out the vehicles, wherein the NOx emission average value after urea is injected is larger than the NOx emission average value after urea is injected at other urea injection points, and counting the number of the vehicles and the proportion of the number of the vehicles injected with urea at the urea injection points;
and step S202, counting all vehicles filled with urea at the point, and calculating the average NOx emission value during driving from the time when urea is added at the point to the time when urea is filled next time.
Further, screening the vehicles, wherein the mean value of NOx emissions after urea injection is greater than the mean value of NOx emissions after urea injection at other urea injection points, and counting the number of the vehicles and the ratio of the number of vehicles injecting urea at the urea injection point, comprises:
step S2011, setting a urea filling point alpha, adding urea into M vehicles, and marking the vehicle A as one of the M vehicles;
step S2012, obtaining the mean value of NOx corresponding to the NOx emission data uploaded n times after the vehicle A is filled with urea every time according to the NOx emission data uploaded n times after the vehicle A is filled with urea at the urea filling point alpha every time, and obtaining the mean value as follows:
wherein Z isAiRepresenting the mean value of NOx corresponding to n times of uploading NOx emission data after urea is filled into the vehicle A each time; piRepresenting the instantaneous value of NOx emission uploaded by the vehicle-mounted terminal A each time; n is an integer > 0;
step S2013, after the vehicle A is filled with urea at the urea filling point alpha for N times, the average value of NOx after the urea is filled for N times is as follows:
wherein,
represents the mean value of NOx of vehicle A after N urea injections; zAiRepresenting the mean value of NOx corresponding to n times of uploading NOx emission data after urea is filled into the vehicle A each time; n is an integer > 0;
step S2014, obtaining the mean value of NOx after urea injection for N times for all vehicles in which urea is injected at the urea injection point α in the manner of step S2013, and calculating and obtaining the mean value of NOx after urea injection for N times for all vehicles in which urea is injected at the urea injection point α, the mean value of NOx emission after urea injection for all vehicles in which urea is injected at the urea injection point α:
wherein P represents the mean NOx emissions after urea injection for all vehicles injected with urea at urea injection point α, and M represents the number of all vehicles injected with urea at urea injection point α;
and
respectively representing the mean value of NOx after urea is injected for N times corresponding to each vehicle in all vehicles injected with urea at a urea injection point alpha;
step S2015, obtaining an average value of NOx after N urea injections at urea injection points other than urea injection point α for all vehicles injected with urea at urea injection point α in the manner of steps S2012 to S2014:
and will be
And with
Make a comparison if
Respectively correspond to less than
The corresponding vehicles are respectively marked as "severe";
step S2016, counting the number of vehicles which are added with urea at the urea filling point alpha and are shown as serious, recording the number as m, and calculating the proportion Z as follows:
wherein Z represents a ratio.
Further, the evaluation condition of step S40 includes:
the first condition is as follows: the average value of the NOx emission of the vehicle in the same emission stage is higher than a standard value (1000 ppm for the fifth vehicle, 550ppm for the sixth vehicle and 1250ppm for the fourth vehicle);
and a second condition: the proportion of vehicles with serious emission after urea is filled is more than 25 percent;
the quality of urea satisfying both conditions was evaluated as "poor", and the quality of urea satisfying either condition was "normal", and the quality of urea not satisfying it was "good".
Further, the method further comprises: the method comprises the following steps of collecting vehicle data information, performing data storage by utilizing the collected vehicle data information, performing clustering calculation analysis on the vehicle data information in the data storage, and grouping the vehicle information of urea filling points for filling urea according to calculation analysis results, wherein the method comprises the following steps:
a1, collecting vehicle data information, wherein the vehicle data information comprises a vehicle frame number, a urea filling point address, a county number of urea filling points, urea filling times, an NOx emission mean value, urea filling time, longitude and latitude, country numbers, a license plate number, urea filling quantity, mileage of the urea filling driving, and the previous serious times of the NOx emission mean value of the urea filling; storing the vehicle data information into a database;
and A2, carrying out aggregation calculation on the vehicle data information stored in the step A1 to obtain an aggregation calculation result, and grouping according to urea filling point addresses according to the aggregation calculation, wherein each urea filling point address corresponds to all vehicle data information collected after urea is filled.
Further, aggregate calculation is performed on the vehicle data information stored in step a1 to obtain an aggregate calculation result, and grouping is performed according to the aggregate calculation and urea filling point addresses according to the aggregate calculation, where each urea filling point address corresponds to all vehicle data information acquired after urea is filled, and the method includes:
step A201, grouping according to urea filling point addresses, and regrouping data after each urea filling point is rented according to a vehicle frame number, wherein the number of the regrouped vehicle frames is the number of vehicles which are filled with urea at the urea filling point;
step A202, each piece of data corresponding to the frame number after regrouping represents the urea filling times, and the urea filling times are summed;
step A203, filtering out the number of NOx emission stops of urea injected at each urea injection point compared with the number of the previous serious vehicles, grouping according to the vehicle frame number, and counting the proportion of the NOx emission mean value compared with the previous serious vehicles;
step A204, grouping the vehicle information of urea filling of each urea filling point according to national standards, comprising the following steps:
step A2041, counting the times of urea injection according to national standards;
step A2042, counting the total mean value of NOx discharged after urea is injected according to national standards, wherein the total mean value of NOx discharged after urea is injected is obtained through the following formula; and the total NOx emission average value/the urea filling times are equal to the emission average value.
The invention has the beneficial effects that:
according to the urea filling point urea quality analysis method based on the remote monitoring platform of the OBD system, the urea quality of each urea filling point is analyzed by the remote monitoring platform based on the OBD system, the urea quality analysis accuracy and the data analysis comprehensiveness of the urea filling point can be effectively improved, and meanwhile vehicle monitoring management and urea quality supervision and analysis with more data sources, large data volume and high integration level can be realized through the remote monitoring platform. On one hand, effective reference basis can be provided for eliminating the phenomenon that black smoke is emitted from the exhaust pipe orifice and the phenomenon that illegal production and sale of low-quality urea are struck, and on the other hand, reference with high cost performance and economic value can be provided for a heavy diesel vehicle driver to select a urea filling point.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a first block diagram illustrating the structure of the packet according to the present invention;
FIG. 3 is a second block diagram illustrating the structure of the packet according to the present invention;
FIG. 4 is a third block diagram illustrating the structure of the packet according to the present invention;
FIG. 5 is a fourth block diagram illustrating the structure of the packet according to the present invention;
fig. 6 is a fifth block diagram illustrating the structure of the packet according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The urea quality analysis method for the urea filling point of the remote monitoring platform based on the OBD system, as shown in the figures 1-6, comprises the following steps:
step S10, tracking the liquid level change of a vehicle urea box through engine data flow information uploaded by a vehicle-mounted terminal, and reversely deducing the position point of a urea filling point by using the position point when the liquid level change of the vehicle urea box exceeds 40%, wherein the position points within the range of 500m are regarded as the same urea filling point; wherein the engine data stream information includes urea tank level, positioning status, longitude, and latitude; step S20, after the urea filling point position is obtained, analyzing NOx emission conditions of all vehicles filled with urea at the urea filling point; the real-time emission value of the NOx is the output value of the SCR downstream NOx sensor uploaded by the vehicle-mounted terminal; step S30, acquiring SCR inlet temperature and SCR outlet temperature of each vehicle, wherein the SCR inlet temperature is lower than or higher than a set threshold value, or the SCR outlet temperature is higher than the SCR inlet temperature, and determining that the real-time NOx emission value is the NOx emission condition of the vehicle filled with urea; and step S40, evaluating the urea quality according to the evaluation conditions, and feeding back the evaluation result.
The SCR inlet temperature is the exhaust temperature of the aftertreatment upstream, the SCR outlet temperature is the exhaust temperature of the aftertreatment downstream, and if the SCR inlet temperature is lower than 300 ℃ or higher than 500 ℃, or the SCR outlet temperature is higher than the inlet temperature, the real-time NOx emission value can be judged to be the NOx emission condition of a vehicle filled with urea. If the SCR inlet temperature is higher than 300 ℃ and lower than 500 ℃, or the SCR outlet temperature is lower than the inlet temperature, the real-time emission value of the NOx can be judged to be the NOx emission condition caused by oil products after the vehicle is refueled.
Wherein, step S10 engine dataflow information that uploads through on-vehicle terminal track vehicle urea case liquid level change, utilize the vehicle urea case liquid level change to exceed the position point when 40% come the backward propulsion urea filling point position point, position point 500m within range considers same urea filling point, include:
step S101, setting the percentage of the liquid level of a urea tank to be L in the engine data information flow uploaded by the vehicle A each timeiSCR downstream NOx sensor output value PiLongitude is XiLatitude of Yi；
Step S102, calculating the fluctuation difference delta L of the liquid level of the urea box of the vehicle A twice, and if the delta L is more than 40 percent, determining (X)i+1，Yi+1) This point belongs to a urea filling point; wherein Δ L ═ Li+1-Li；
S103, calculating to obtain a distance d taking longitude and latitude of two urea filling points as a fulcrum, and marking the two urea filling points as one urea filling point if d is less than 500And the position of the urea filling point is defaulted to the longitude and latitude (X) of the most initial urea filling pointm，Ym) (ii) a The distance d between the two urea filling points with the longitude and latitude as the fulcrum is obtained by the following formula:
d＝R·arcos[cos(Ym)·cos(Yn)·cos(Xm-Xn)+sin(Ym)·sin(Yn)]
wherein, R represents the radius of the earth, and R is 6371.0 km; xm，YmAnd Xn，YnRespectively representing the longitude and latitude of two urea filling points.
Analyzing NOx emissions from all vehicles that are filled with urea at this urea fill point as set forth in step S20 includes:
step 201, screening out vehicles, wherein after urea is filled, the NOx emission value is larger than a set threshold value, namely the NOx emission value exceeds a national standard value, and counting the number of the vehicles and the proportion of the number of vehicles which fill urea at the urea filling point;
and step 202, counting all vehicles filled with urea at the point, and calculating the average value of NOx emission during driving from the time when urea is added at the point to the time when urea is filled next time.
In the screening of the vehicles in step 201, the mean NOx emission after urea injection is greater than the mean NOx emission after urea injection at other urea injection points, and the counting of the number of the vehicles and the ratio of the number of vehicles injecting urea at the urea injection point includes:
step S2011, setting a urea filling point alpha to have M vehicles added with urea, and marking the vehicle A as one of the M vehicles;
step S2012, obtaining the mean value of NOx corresponding to the NOx emission data uploaded n times after the vehicle A is filled with urea every time according to the NOx emission data uploaded n times after the vehicle A is filled with urea at the urea filling point alpha every time, and obtaining the mean value as follows:
wherein Z isAiIndicates each time of car A fillingUploading the mean value of NOx corresponding to NOx emission data n times after urea; piRepresenting the instantaneous value of NOx emission uploaded by the vehicle-mounted terminal A each time; n is an integer > 0;
step S2013, after the vehicle A is filled with urea at the urea filling point alpha for N times, the average value of NOx after the urea is filled for N times is as follows:
wherein,
represents the mean value of NOx of vehicle A after N urea injections; zAiRepresenting the mean value of NOx corresponding to n times of uploading NOx emission data after urea is filled into the vehicle A each time; n is an integer > 0;
step S2014, obtaining the mean NOx emission values after N times of urea injection for all vehicles in which urea is injected at the urea injection point α by using the method in step S2013, and calculating the mean NOx emission values after N times of urea injection for all vehicles in which urea is injected at the urea injection point α by using the mean NOx emission values after N times of urea injection for all vehicles:
wherein P represents the mean NOx emissions after urea injection for all vehicles that have been injected with urea at the urea injection point α, and M represents the number of all vehicles injected with urea at the urea injection point α;
and
respectively representing the mean value of NOx after urea is injected for N times corresponding to each vehicle in all vehicles injected with urea at a urea injection point alpha;
step S2015, acquiring the urea injection point in the manner of step S2012 to step S2014Mean value of NOx after N urea injections for all vehicles with urea injection at the urea injection point other than the urea injection point α:
and will be
And
make a comparison if
Respectively correspond to less than
The corresponding vehicles are respectively marked as "severe";
step S2016, counting the number of all vehicles which have been added with urea at the urea addition point α and are indicated as "severe", and recording as m, wherein the calculation ratio Z is:
wherein Z represents a ratio.
The evaluation condition of step S40 includes:
the first condition is as follows: the average value of the NOx emission of the vehicle in the same emission stage is higher than a standard value (1000 ppm for the fifth vehicle, 550ppm for the sixth vehicle and 1250ppm for the fourth vehicle);
and a second condition: the proportion of vehicles with serious emission after urea is filled is more than 25 percent;
wherein, the quality of the urea which meets both conditions is evaluated as 'poor', the quality of the urea which meets any one of the conditions is 'normal', and the quality of the urea which does not meet the conditions is 'good'.
Further comprising: and acquiring the actual urea injection amount and the urea tank liquid level of each vehicle, if the urea tank liquid level is lower than a set value, or the actual urea injection amount is zero or negative, and determining the abnormal NOx emission reason and positioning the vehicle according to the urea quality at the urea injection point.
Analyzing the using condition of urea of a single vehicle: the method comprises the steps of tracking the real-time use condition of urea of each vehicle, reversely analyzing fields of 'reactant residual quantity (urea box liquid level)', 'SCR inlet temperature (aftertreatment upstream exhaust temperature)', 'SCR outlet temperature (aftertreatment downstream exhaust temperature)', and 'actual urea injection quantity' uploaded by a vehicle-mounted terminal if NOx emission is abnormal, and leading an SCR catalytic chamber to not reach the corresponding treatment level if the urea box liquid level is lower than 10%, the SCR inlet temperature is lower than 300 ℃ or higher than 500 ℃, the SCR outlet temperature is higher than the inlet temperature, and the actual urea injection quantity is 0 or negative, so that vehicles which are not subjected to urea injection for a long time can be screened out. Namely, when the SCR parameter is abnormal, the NOx emission value of the vehicle after urea is filled is judged.
The effect of the technical scheme is as follows: by the mode, the accuracy of urea quality assessment and the efficiency of urea quality assessment can be effectively improved. The flow and the calculated amount of data calculation processing are simplified, and the response speed of urea quality analysis is improved.
In one embodiment of the present invention, the method further comprises: the method comprises the following steps of collecting vehicle data information, utilizing the collected vehicle data information to perform data storage, performing clustering calculation analysis on the vehicle data information in the data storage, and grouping the vehicle information of urea filling points for urea filling according to calculation analysis results, wherein the method comprises the following steps:
a1, collecting vehicle data information, wherein the vehicle data information comprises a vehicle frame number, a urea filling point address, a county number of urea filling points, urea filling times, an NOx emission mean value, urea filling time, longitude and latitude, country numbers, a license plate number, urea filling quantity, mileage of the urea filling driving, and the previous serious times of the NOx emission mean value of the urea filling; storing the vehicle data information into a database;
and A2, carrying out aggregation calculation on the vehicle data information stored in the step A1 to obtain an aggregation calculation result, and grouping according to urea filling point addresses according to the aggregation calculation, wherein each urea filling point address corresponds to all vehicle data information collected after urea is filled.
The step a1 of aggregating the vehicle data information stored in step a to obtain an aggregate calculation result, and grouping the vehicle data information according to the aggregate calculation according to urea filling point addresses, where each urea filling point address corresponds to all vehicle data information collected after urea is filled, and includes:
step A201, grouping according to urea filling point addresses, and regrouping data after each urea filling point is rented according to a vehicle frame number, wherein the number of the regrouped vehicle frames is the number of vehicles which are filled with urea at the urea filling point;
step A202, each piece of data corresponding to the frame number after regrouping represents the urea filling times, and the urea filling times are summed;
step A203, filtering the number of NOx emission average values of urea injected at each urea injection point compared with the number of the front serious vehicles, grouping according to the frame number, and counting the proportion of the NOx emission average values compared with the number of the front serious vehicles;
step A204, grouping the vehicle information of urea filling at each urea filling point according to national standards, wherein the vehicle information comprises four vehicles in China, five vehicles in China and six vehicles in China:
step A2041, counting the times of urea injection according to national standards;
step A2042, counting the total mean value of NOx discharged after urea is injected according to national standards, wherein the total mean value of NOx discharged after urea is injected is obtained through the following formula; and the total NOx emission average value/the urea filling times are equal to the emission average value.
The effect of the technical scheme is as follows: the urea quality of each urea filling point is analyzed by using the remote monitoring platform based on the OBD system, the accuracy of urea quality analysis of the urea filling points and the comprehensiveness of data analysis can be effectively improved, and meanwhile, vehicle monitoring management and urea quality supervision and analysis with more data sources, large data volume and high integration level can be realized through the remote monitoring platform. On one hand, effective reference basis can be provided for eliminating the phenomenon that black smoke is emitted from the exhaust pipe orifice and the phenomenon that illegal production and sale of low-quality urea are struck, and on the other hand, reference with high cost performance and economic value can be provided for a heavy diesel vehicle driver to select a urea filling point.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. A urea filling point urea quality analysis method based on a remote monitoring platform of an OBD system is characterized by comprising the following steps:
step S10, tracking the liquid level change of a vehicle urea box through engine data flow information uploaded by a vehicle-mounted terminal, and reversely estimating the position point of a urea filling point by utilizing the fact that the liquid level change of the vehicle urea box exceeds a set position point, wherein the position point is regarded as the same urea filling point within a set range; wherein the engine data stream information includes urea tank level, positioning status, longitude, and latitude;
step S20, after the urea filling point position is obtained, analyzing the NOx emission condition of all vehicles filled with urea at the urea filling point; the real-time emission value of the NOx is the output value of the SCR downstream NOx sensor uploaded by the vehicle-mounted terminal;
step S30, acquiring SCR inlet temperature and SCR outlet temperature of each vehicle, wherein the SCR inlet temperature is lower than or higher than a set threshold value, or the SCR outlet temperature is higher than the SCR inlet temperature, and determining that the real-time NOx emission value is the NOx emission condition of the vehicle filled with urea;
and step S40, evaluating the quality of the urea according to the evaluation conditions, and feeding back the evaluation result.
2. The method of claim 1, wherein the step S10 of tracking the liquid level change of the vehicle urea tank through the engine data stream information uploaded by the vehicle-mounted terminal, and using the liquid level change of the vehicle urea tank to exceed a set point to reversely estimate the position point of the urea filling point, wherein the position point is considered as the same urea filling point within a set range, comprises:
step S101, setting the percentage of the liquid level of a urea tank to be L in the engine data information flow uploaded by the vehicle A each timeiSCR downstream NOx sensor output value PiLongitude is XiLatitude of Yi；
Step S102, calculating the fluctuation difference delta L of the liquid level of the urea box of the vehicle A twice, and determining (X) if the delta L is more than 40%i，Yi) And (X)i+1，Yi+1) Belonging to a urea filling point; wherein Δ L ═ Li+1-Li；
Step S103, calculating to obtain a distance d taking longitude and latitude of two urea filling points as a fulcrum, if d is less than 500, marking the two urea filling points as one urea filling point, and defaulting the position of the urea filling point to be the longitude and latitude of the initial urea filling point (X)m，Ym) (ii) a The distance d between the two urea filling points with the longitude and latitude as the fulcrum is obtained by the following formula:
d＝R·arcos[cos(Ym)·cos(Yn)·cos(Xm-Xn)+sin(Ym)·sin(Yn)]
wherein, R represents the radius of the earth, and R is 6371.0 km; xm，YmAnd Xn，YnRespectively representing the longitude and latitude of two urea filling points.
3. The method of claim 1, wherein analyzing NOx emissions from all vehicles that are filled with urea at the urea fill point in step S20 comprises:
step S201, screening out vehicles, wherein the NOx emission average value after urea is injected is larger than the NOx emission average value after urea is injected at other urea injection points, and counting the number of the vehicles and the proportion of the number of vehicles which are injected with urea at the urea injection points;
and step S202, counting all vehicles filled with urea at the point, and calculating the average NOx emission value during driving from the time when urea is added at the point to the time when urea is filled next time.
4. The method of claim 3, wherein the vehicles are screened for NOx emission mean after urea injection > NOx emission mean after urea injection at other urea injection points, and the number of vehicles and the percentage of the number of vehicles injected with urea at the urea injection point are counted, including:
step S2011, setting a urea filling point alpha to have M vehicles added with urea, and marking the vehicle A as one of the M vehicles;
step S2012, according to the n times of NOx emission data uploaded after urea is added at the urea adding point alpha of the vehicle A each time, acquiring the mean value of NOx corresponding to the n times of NOx emission data uploaded after the vehicle A is added with urea each time as follows:
wherein Z isAiRepresenting the mean value of NOx corresponding to the NOx emission data uploaded n times after urea is filled into the vehicle A each time; piRepresenting the instantaneous value of NOx emission uploaded by the vehicle-mounted terminal A each time; n is an integer > 0;
step S2013, after the vehicle A is filled with urea at the urea filling point alpha for N times, the average value of NOx after the urea is filled for N times is as follows:
wherein,
represents the mean value of NOx of vehicle A after N urea injections; zAiRepresenting the mean value of NOx corresponding to n times of uploading NOx emission data after urea is filled into the vehicle A each time; n is an integer > 0;
step S2014, obtaining the mean value of NOx after urea injection for N times for all vehicles in which urea is injected at the urea injection point α in the manner of step S2013, and calculating and obtaining the mean value of NOx after urea injection for N times for all vehicles in which urea is injected at the urea injection point α, the mean value of NOx emission after urea injection for all vehicles in which urea is injected at the urea injection point α:
wherein P represents the mean NOx emissions after urea injection for all vehicles injected with urea at urea injection point α, and M represents the number of all vehicles injected with urea at urea injection point α;
and
respectively representing the mean value of NOx after urea is injected for N times corresponding to each vehicle in all vehicles injected with urea at a urea injection point alpha;
step S2015, obtaining an average of NOx values after N urea injections at urea injection points other than the urea injection point α of all vehicles injected with urea at the urea injection point α in the manner of step S2012 to step S2014:
and will be
And
make a comparison if
Respectively correspond to less than
Then will beThe corresponding vehicles are respectively marked as "severe";
step S2016, counting the number of vehicles which are added with urea at the urea filling point alpha and are shown as serious, recording the number as m, and calculating the proportion Z as follows:
wherein Z represents a ratio.
5. The method according to claim 4, wherein the evaluating conditions of step S40 includes:
the first condition is as follows: the average value of the vehicle NOx emission is higher than a standard value in the same emission stage;
and (2) carrying out a second condition: vehicles that appeared "severe" after urea filling were > 25%;
wherein, the quality of the urea which is satisfied by both conditions is evaluated as 'poor', the quality of the urea which is satisfied by either condition is 'normal', and the quality of the urea which is not satisfied is 'good'.
6. The method of claim 5, further comprising: the method comprises the following steps of collecting vehicle data information, performing data storage by utilizing the collected vehicle data information, performing clustering calculation analysis on the vehicle data information in the data storage, and grouping the vehicle information of urea filling at a urea filling point according to a calculation analysis result, wherein the method comprises the following steps:
step A1, collecting vehicle data information, wherein the vehicle data information comprises the following steps: acquiring the actual urea injection amount and the urea tank liquid level of each vehicle, if the urea tank liquid level is lower than a set value, or the actual urea injection amount is zero or negative, and determining the NOx emission abnormal reason and positioning the vehicle according to the urea quality at a urea injection point;
the number of the vehicle frame, the address of the urea filling point, the county number of the urea filling point, the number of times of filling urea, the average NOx emission value, the time of filling urea, the longitude and latitude, the national standard, the license plate number, the amount of filling urea, the mileage of the urea filling driving, and the number of times of the urea filling NOx emission average value is more serious than before; storing the vehicle data information into a database;
and A2, carrying out aggregation calculation on the vehicle data information stored in the step A1 to obtain an aggregation calculation result, and grouping according to urea filling point addresses according to the aggregation calculation, wherein each urea filling point address corresponds to all vehicle data information collected after urea is filled.
7. The method of claim 6, wherein the step A1 of aggregating the vehicle data information to obtain aggregated results, and grouping the aggregated results according to urea filling point addresses according to the aggregated results, wherein each urea filling point address corresponds to all vehicle data information collected after urea filling, and comprises:
step A201, grouping according to urea filling point addresses, and regrouping data after grouping of each urea filling point according to a frame number, wherein the number of the regrouped frames is the number of vehicles which are filled with urea at the urea filling point;
step A202, each piece of data corresponding to the frame number after regrouping represents the urea filling times, and the urea filling times are summed;
step A203, filtering the number of NOx emission average values of urea injected at each urea injection point compared with the number of the front serious vehicles, grouping according to the frame number, and counting the proportion of the NOx emission average values compared with the number of the front serious vehicles;
step A204, grouping the vehicle information of urea filling of each urea filling point according to national standards, comprising the following steps:
step A2041, counting the times of urea injection according to national standards;
step A2042, counting the total mean value of NOx discharged after urea is injected according to national standards, wherein the total mean value of NOx discharged after urea is injected is obtained through the following formula; and the total NOx emission average value/the urea filling times are equal to the emission average value.
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