CN116973784A - Method for rapidly testing low-temperature driving range of pure electric vehicle, electronic equipment and medium - Google Patents
Method for rapidly testing low-temperature driving range of pure electric vehicle, electronic equipment and medium Download PDFInfo
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Abstract
The application relates to the technical field of transportation and discloses a method for rapidly testing low-temperature driving mileage of a pure electric vehicle, electronic equipment and a medium, wherein the method comprises the following steps: determining a low-temperature driving range rapid test working condition, wherein the low-temperature driving range rapid test working condition comprises a CLTC multi-cycle working condition section and a high-efficiency discharge working condition section; according to the low-temperature driving range rapid test working condition, the low-temperature driving range rapid test is carried out, and the discharge energy of the CLTC multi-cycle working condition section and the discharge energy of the high-efficiency discharge working condition section are recorded; judging whether the discharge process of the high-efficiency discharge working condition section has abnormal energy fluctuation according to the discharge energy of the high-efficiency discharge working condition section, and correcting the discharge energy of the abnormal high-efficiency discharge working condition section; and calculating the low-temperature driving range according to the corrected discharge energy of the high-efficiency discharge working condition section and the discharge energy of the CLTC multi-cycle working condition section. And (3) performing quick test and energy correction according to the low-temperature driving range quick test working condition, so that the test efficiency and the accuracy of a calculation result are improved, and the universality of the test method is enhanced.
Description
Technical Field
The application relates to the technical field of transportation, in particular to a method, electronic equipment and medium for rapidly testing low-temperature driving mileage of a pure electric vehicle.
Background
With the continuous increase of the driving range and the further increase of the low-temperature test demand brought by the breakthrough of the battery capacity technology of the pure electric vehicle, the input cost of the low-temperature driving range test which can only be carried out by using a conventional working condition method is doubled. The rapid test method can obviously shorten the test time and reduce the test cost, so that development of the rapid test method in the low-temperature driving range test is necessary.
However, battery thermal management strategies unique to some vehicle models, or types of heat pump air conditioners or PTC thermistors are carried, which cause a significant difference between the low temperature discharge law and normal temperature, e.g., a vehicle operating at normal temperature for 2 cycles can reach thermal equilibrium, but at low temperatures a greater number of cycles are required. In addition, when the vehicle runs in a low-temperature environment, some vehicle types heat the battery system in the later stage of discharging, and part of energy is output from the battery and is a part of the total discharging amount of the battery, so that the electric energy actually used for driving the vehicle is reduced. Through experiments, if the normal temperature shortening method is applied to low temperature tests, the deviation of the driving mileage result exceeds 15% for part of vehicle types, and the above results show that the existing normal temperature shortening method test working condition is not applicable to low temperature.
Therefore, a method for rapidly testing the low-temperature driving range of the pure electric vehicle is needed, which can be suitable for the low-temperature discharging process of all vehicle types and can correct energy, so that the efficiency of the low-temperature driving range test is improved, the accuracy of the calculation result of the low-temperature driving range is improved, and the universality of the low-temperature driving range testing method is enhanced.
Disclosure of Invention
In order to solve the technical problems, the application provides a method, electronic equipment and medium for rapidly testing low-temperature driving mileage of a pure electric vehicle, which comprise rapid test working conditions suitable for low-temperature discharge processes of all vehicle types; and an energy correction scheme is provided, so that the deviation of the low-temperature driving range calculation result is reduced, the efficiency of the low-temperature driving range test is improved, the accuracy of the low-temperature driving range calculation result is improved, and the universality of the low-temperature driving range test method is enhanced.
The application provides a method for rapidly testing low-temperature driving mileage of a pure electric vehicle, which comprises the following steps:
s1, determining a low-temperature driving range rapid test working condition, wherein the low-temperature driving range rapid test working condition comprises a CLTC multi-cycle working condition section and a high-efficiency discharge working condition section;
s2, carrying out low-temperature driving range rapid test according to a low-temperature driving range rapid test working condition, and recording the discharge energy of the CLTC multi-cycle working condition section and the discharge energy of the high-efficiency discharge working condition section;
s3, judging whether the discharge process of the efficient discharge working condition section has energy fluctuation abnormality according to the discharge energy of the efficient discharge working condition section, and correcting the discharge energy of the abnormal efficient discharge working condition section if the energy fluctuation abnormality exists;
and S4, calculating the low-temperature driving range according to the corrected discharge energy of the high-efficiency discharge working condition section and the discharge energy of the CLTC multi-cycle working condition section.
Further, S1, determining a low-temperature driving range fast test working condition specifically includes:
determining the CLTC circulation number P contained in the CLTC multi-circulation working condition section;
and determining the constant speed V of the high-efficiency discharging working condition section.
Further, determining the CLTC cycle number P contained in the CLTC multi-cycle operating condition segment includes:
calculating a moving average Q of discharge energy of the vehicle for sequentially successive 3 CLTC cycles j The formula is:
，j≥2
wherein W is j The discharging energy of each CLTC cycle obtained according to a conventional working condition method is j, and j is the serial number of the CLTC cycle;
according to two adjacent moving average values Q j And Q j-1 Calculating the difference Q of the moving average j difference value According to the difference Q of the moving average j difference value With corresponding moving average value Q j Is calculated as the ratio of the difference percentage Q Percentage of j difference ；
Record the percent difference Q Percentage of j difference A sequence number j of CLTC cycles less than a preset percentage for the first time;
and counting the serial numbers j of the CLTC cycles recorded by a plurality of groups of vehicles, and determining the serial number j of the CLTC cycle with the highest duty ratio as the CLTC cycle number P contained in the CLTC multi-cycle working condition section.
Further, the calculating process of the discharge energy of the high-efficiency discharge working condition section specifically comprises the following steps:
dividing the high-efficiency discharge working condition section into an acceleration section and m+1 micro constant speed sections;
calculating discharge energy X of acceleration section Acceleration of Discharge energy X of each micro constant speed section i Where i is the sequence number of each micro constant speed section, i=1, 2, …, m+1;
the discharge energy EH of the high-efficiency discharge working condition section is equal to the discharge energy X of the acceleration section Acceleration of Discharge energy X from each micro constant velocity section i Sum of (2)。
Further, S3, determining whether the discharge process of the efficient discharge working condition segment has an abnormal energy fluctuation according to the discharge energy of the efficient discharge working condition segment, and if the discharge process has the abnormal energy fluctuation, correcting the discharge energy of the abnormal efficient discharge working condition segment includes:
calculating accumulated average energy f corresponding to micro constant speed section i Wherein, i=2, m;
calculating discharge energy X of each micro constant speed section i With corresponding accumulated average energy f i Deviation percentage p of (2) i Determining the deviation percentage p i Whether the normal fluctuation range is exceeded;
if the deviation percentage p i If the energy fluctuation of the micro constant speed section exceeds the normal fluctuation range, judging that the energy fluctuation of the micro constant speed section is abnormal, and discharging the discharge energy X of the micro constant speed section with abnormal energy fluctuation i Correcting;
the discharge energy X of each micro constant speed section is completed i After correction, the discharge energy EH of the high-efficiency discharge working condition section is synchronously corrected.
Further, discharge energy X of micro constant speed section with abnormal energy fluctuation i The correction specifically comprises the following steps:
cumulative average energy f corresponding to micro constant speed section with abnormal energy fluctuation i Discharge energy X as a micro constant speed section with abnormal energy fluctuation i And (5) performing correction.
Further, S4, calculating the low temperature driving range according to the corrected discharge energy of the high-efficiency discharge working condition segment and the discharge energy of the CLTC multi-cycle working condition segment includes:
s41, calculating the total discharge energy E of the vehicle, wherein the total discharge energy E of the vehicle is equal to the sum of the discharge energy of the CLTC multi-cycle working condition section and the discharge energy EH of the high-efficiency discharge working condition section;
s42, according to the discharge energy E of each CLTC cycle in the CLTC multi-cycle working condition section l Duty cycle in total discharge energy E, determining power consumption weighting factor K l The formula is:
wherein, l is the serial number of each CLTC cycle contained in the CLTC multi-cycle working condition section under the low-temperature driving range rapid test method, and P is the CLTC cycle number contained in the CLTC multi-cycle working condition section;
s43, weighting factor K according to electricity consumption l And discharge energy E per CLTC cycle in a CLTC multi-cycle operating regime l The average power consumption M is calculated, and the formula is as follows:
wherein S is l Mileage per CLTC cycle;
and S44, calculating the low-temperature driving range S of the vehicle according to the total discharge energy E and the average power consumption rate M, wherein the low-temperature driving range S is equal to the ratio of the total discharge energy E to the average power consumption rate M.
The application also provides an electronic device, which comprises:
a processor and a memory;
the processor is used for executing the steps of the method for quickly testing the low-temperature driving range of the pure electric vehicle by calling the program or the instructions stored in the memory.
The application also provides a computer-readable storage medium storing a program or instructions that cause a computer to perform the steps of a method for rapidly measuring low-temperature range of a pure electric vehicle as described in any one of the above.
The embodiment of the application has the following technical effects:
the low-temperature range rapid test working condition suitable for the low-temperature discharge process of all vehicle types is determined based on the low-temperature energy change rule of the vehicle, rapid test is carried out according to the low-temperature range rapid test working condition, energy correction is carried out, and deviation of a low-temperature range calculation result is reduced, so that the efficiency of the low-temperature range test is improved, the accuracy of the low-temperature range calculation result is improved, and the universality of the low-temperature range test method is enhanced.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for rapidly testing low-temperature driving range of a pure electric vehicle according to an embodiment of the present application;
fig. 2 is a logic diagram of a method for rapidly testing low-temperature driving range of a pure electric vehicle according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a discharge energy variation rule of multiple sets of vehicle CLTC cycles under a conventional working condition test provided by an embodiment of the present application;
fig. 4 is a schematic diagram of a low-temperature driving range rapid test condition of a pure electric vehicle according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the application, are within the scope of the application.
Fig. 1 is a flowchart of a method for rapidly testing low-temperature driving range of a pure electric vehicle according to an embodiment of the present application, and fig. 2 is a logic diagram of a method for rapidly testing low-temperature driving range of a pure electric vehicle according to an embodiment of the present application. Referring to fig. 1 and 2, the method specifically includes:
s1, determining a low-temperature driving range rapid test working condition, wherein the low-temperature driving range rapid test working condition comprises a CLTC multi-cycle working condition section and a high-efficiency discharge working condition section.
Specifically, determining the low-temperature driving range rapid test working condition comprises determining the CLTC circulation number P contained in the CLTC multi-circulation working condition section; and determining the constant speed V of the high-efficiency discharging working condition section.
Specifically, a conventional working condition method is used for testing in a low-temperature environment bin based on a typical vehicle model, and the change rule of the discharge energy of vehicle circulation at low temperature is counted, namely, how many circulation is needed to reach the stability of the discharge energy, so that the CLTC circulation number P contained in a CLTC multi-circulation working condition section is determined. The normal working condition method consists of a plurality of continuous CLTC cycles, and the vehicle continuously runs the CLTC cycles on the chassis dynamometer during the test until reaching the standard specified end condition, and the test is stopped. The method can obtain actual driving mileage and obtain the electric energy change trend of different CLTC cycles by using a high-performance power analyzer. FIG. 3 is a schematic diagram of a change rule of discharge energy of multiple groups of CLTC cycles of a vehicle under a conventional working condition test, and referring to FIG. 3, test data of 15 groups of typical vehicles for low-temperature test discharge by using the conventional working condition test are obtained, wherein the test data comprise 8 groups of sedans, 6 groups of SUVs and 1 group of micro electric vehicles, the test data are recorded by a power analyzer, and each group of test data comprises discharge energy W of each CLTC cycle j Cycle mileage d per CLTC j The method comprises the steps of carrying out a first treatment on the surface of the Illustratively, the low temperature environment of the low temperature test may be set to-7 ℃.
As shown in Table 1, the CLTC cycle and discharge energy W under a conventional operating mode method are shown j Moving average Q j Difference of moving average Q j difference value Sum of difference percentage Q Percentage of j difference Correspondence between:
TABLE 1 relationship mapping table of CLTC circulation under conventional working condition method
Referring to table 1, determining the CLTC cycle number P contained in the CLTC multi-cycle operating mode segment specifically includes:
calculating a moving average of discharge energy of a vehicle for sequentially successive 3 CLTC cyclesQ j The formula is:
，j≥2（1）
wherein W is j And j is the serial number of the CLTC cycle, wherein the discharge energy of each CLTC cycle is obtained according to a conventional working condition method. Since the power consumption of the 1 st CLTC cycle is generally high due to operations involving cabin warm-up and maintenance, battery system warm-up, and the like when the vehicle is running at a low temperature, the moving average of the 1 st CLTC cycle is not calculated, and calculation is started from the moving average of the 2 nd CLTC cycle.
According to two adjacent moving average values Q j And Q j-1 Calculating the difference Q of the moving average j difference value ，Q j difference value =Q j -Q j-1 。
Difference Q according to moving average j difference value With corresponding moving average value Q j Is calculated as the ratio of the difference percentage Q Percentage of j difference ，Q Percentage of j difference =Q j difference value /Q j 。
Record the percent difference Q Percentage of j difference Sequence number j of CLTC cycle less than the preset percentage for the first time. Wherein, the preset percentage can be set according to the requirement, when the difference percentage Q Percentage of j difference Below a preset percentage, it is indicated that the discharge energy per cycle of the vehicle is substantially stable. Illustratively, the preset percentage may be set to 3%, with the difference percentage Q shown in Table 1 Percentage of j difference The number of CLTC cycles that were less than 3% of the preset percentage for the first time was 5.
And counting the sequence numbers j of the CLTC cycles recorded by a plurality of groups of vehicles under a conventional working condition method, determining the sequence number j of the CLTC cycle with the highest duty ratio as the CLTC cycle number P contained in the CLTC multi-cycle working condition section, and obtaining the sequence number l of the CLTC cycle when the low-temperature range rapid test is carried out according to the low-temperature range rapid test working condition, wherein l=1, 2. Illustratively, the numbers j of CLTC cycles recorded by 15 groups of vehicles under the normal working condition method are respectively: 5,4,6,5,4,4,5,5,5,5,5,4,5,4,5; the total 9 groups of data with the sequence number of 5 of the CLTC cycles have the highest proportion, the total 5 groups of data with the sequence number of 4 of the CLTC cycles are next to the total 5 groups of data with the sequence number of 6 of the CLTC cycles, and therefore the number P of the CLTC cycles contained in the CLTC multi-cycle working condition section is determined to be 5, namely the sequence number l=1, 2,3,4 and 5 of the CLTC cycles contained in the CLTC multi-cycle working condition section.
Further, the operation condition of the high-efficiency discharging condition section is high-speed constant-speed discharging, wherein the vehicle speed is changed into: starting acceleration to a constant speed V within 2 minutes from the speed of 0 and keeping the tolerance requirement of +/-2 km/h until the vehicle continuously exceeds the tolerance requirement for 4 seconds, decelerating to the speed of 0 during sliding, and ending the high-efficiency discharging section. Wherein the constant speed V may be set according to user feedback, for example, about 40% of users select 110km/h according to 157 user feedback about "a constant speed value of trend selection", and the duty ratio is highest, so the constant speed V of the high-efficiency discharge operating mode section is set to 110km/h. Fig. 4 is a schematic diagram of a low-temperature range rapid test working condition of a pure electric vehicle provided by the embodiment of the application, and referring to fig. 4, according to the determining step of the low-temperature range rapid test working condition, a low-temperature range rapid test working condition consisting of continuous 5 CLTC cycles and a high-efficiency discharge working condition section with a constant speed of 110km/h can be obtained.
S2, carrying out low-temperature driving range rapid test according to the low-temperature driving range rapid test working condition, and recording the discharge energy of the CLTC multi-cycle working condition section and the discharge energy of the high-efficiency discharge working condition section.
Specifically, in a low-temperature hub-rotating environmental bin, a test sample vehicle is selected to test according to a low-temperature driving mileage rapid test working condition, and the discharge power E is recorded in the whole process J And vehicle speed, data frequency is 1Hz. The discharge energy of the CLTC multi-cycle operating mode segment is the sum of the discharge energy of all CLTC cycles. The discharge energy calculation process of the high-efficiency discharge working condition section specifically comprises the following steps:
the high-efficiency discharge working condition section is divided into an acceleration section and m+1 micro constant speed sections.
Illustratively, the first 2 minutes of the high-efficiency discharge regime segment is an acceleration process, followed by a constant-speed process to the end, thus dividing the first 2 minutes of the high-efficiency discharge regime segment into acceleration segments, followed by dividing the constant-speed process into m+1 micro constant-speed segments in step 10 minutes, wherein the first m are complete micro constant-speed segments.
Calculating discharge energy X of acceleration section Acceleration of Discharge energy X of each micro constant speed section i Where i is the sequence number of each micro constant speed section, i=1, 2, …, m+1.
Specifically, the calculation formula is:
（2）
wherein X can be the discharge energy X of the acceleration section Acceleration of Or discharge energy X of each micro constant speed section i ，t 0 For the start time of the segment, t end For the end time of the segment E J T is the data frequency for the discharge power of the segment.
The discharge energy EH of the high-efficiency discharge working condition section is equal to the discharge energy X of the acceleration section Acceleration of Discharge energy X from each micro constant velocity section i Is a sum of (a) and (b).
S3, judging whether the discharge process of the high-efficiency discharge working condition section has energy fluctuation abnormality according to the discharge energy of the high-efficiency discharge working condition section, and correcting the abnormal discharge energy of the high-efficiency discharge working condition section if the energy fluctuation abnormality exists.
Specifically, the accumulated average energy f corresponding to the micro constant speed section is calculated i The calculation formula is as follows:
，i=2,…,m（3）
calculating discharge energy X of each micro constant speed section i With corresponding accumulated average energy f i Deviation percentage p of (2) i Determining the deviation percentage p i Whether or not the normal fluctuation range is exceeded, the deviation percentage p i The calculation formula of (2) is as follows:
（4）
if the deviation percentage p i Beyond the normal fluctuation rangeDetermining the abnormal energy fluctuation of the micro constant speed section and discharging energy X of the micro constant speed section with abnormal energy fluctuation i Correcting; for example, the normal fluctuation range may be set to ±5%. Further, the accumulated average energy f corresponding to the micro constant speed section with abnormal energy fluctuation i Discharge energy X as a micro constant speed section with abnormal energy fluctuation i And (5) performing correction.
The discharge energy X of each micro constant speed section is completed i After correction, the discharge energy EH of the high-efficiency discharge working condition section is synchronously corrected.
And S4, calculating the low-temperature driving range according to the corrected discharge energy of the high-efficiency discharge working condition section and the discharge energy of the CLTC multi-cycle working condition section.
S41, calculating the total discharge energy E of the vehicle, wherein the total discharge energy E of the vehicle is equal to the sum of the discharge energy of the CLTC multi-cycle working condition section and the discharge energy EH of the high-efficiency discharge working condition section.
S42, according to the discharge energy E of each CLTC cycle in the CLTC multi-cycle working condition section l Duty cycle in total discharge energy E, determining power consumption weighting factor K l The formula is:
（5）
wherein l is the serial number of each CLTC cycle contained in the CLTC multi-cycle working condition section under the low-temperature driving range rapid test method, and P is the CLTC cycle number contained in the CLTC multi-cycle working condition section.
S43, weighting factor K according to electricity consumption l And discharge energy E per CLTC cycle in a CLTC multi-cycle operating regime l The average power consumption M is calculated, and the formula is as follows:
（6）
wherein S is l Mileage per CLTC cycle.
And S44, calculating the low-temperature driving range S of the vehicle according to the total discharge energy E and the average power consumption rate M, wherein the low-temperature driving range S is equal to the ratio of the total discharge energy E to the average power consumption rate M.
In the embodiment of the application, the low-temperature driving range rapid test working condition suitable for the low-temperature discharge process of all vehicle types is determined based on the low-temperature energy change rule of the vehicle, the rapid test is carried out according to the low-temperature driving range rapid test working condition, the energy correction is carried out, and the deviation of the low-temperature driving range calculation result is reduced, so that the efficiency of the low-temperature driving range test is improved, the accuracy of the low-temperature driving range calculation result is improved, and the universality of the low-temperature driving range test method is enhanced.
As can be seen from the schematic diagram of the discharge energy change law of the multiple sets of vehicle CLTC cycles under the conventional operating mode test shown in fig. 3, the change law of the discharge energy of the vehicle cycle at low temperature is classified into two types, one type is a bulge after the discharge energy is reduced, and the other type is a stability after the discharge energy is reduced. The change rule of the discharging energy of the vehicle 1 is that the discharging energy is stable after being reduced, the change rule of the discharging energy of the vehicle 4 is that the discharging energy is raised after being reduced, namely, the discharging energy has a bulge after being reduced, which indicates that part of the energy of the vehicle 4 is used for heating the battery in the later stage of discharging, the part of the energy is output from the battery and is a part of the total discharging capacity of the battery, and the electric energy actually used for driving the vehicle to run is correspondingly reduced, and in this case, the total discharging energy cannot be used for calculating the driving range. Therefore, the vehicle 1 and the vehicle 4 are selected to respectively perform the low-temperature driving range rapid test, and the accuracy of the low-temperature driving range rapid test method is verified.
Illustratively, the vehicle 1 is tested for low range speed based on a low range speed test condition consisting of a continuous 5 CLTC cycles and a high efficiency discharge condition segment at a constant speed of 110km/h. And divides the high-efficiency discharging working condition section of the vehicle 1 into an accelerating section and 12 micro constant speed sections, wherein the first 11 micro constant speed sections are full-duration micro constant speed sections. Calculating discharge energy X of acceleration section Acceleration of The discharge energy for the 756, 12 micro constant speed sections were: x is X 1 =3633W·h，X 2 =3589W·h，X 3 =3530W·h，X 4 =3660W·h，X 5 =3545W·h，X 6 =3710W·h，X 7 =3683W·h，X 8 =3621W·h，X 9 =3572W·h，X 10 =3594W·h，X 11 =3573W·h，X 12 =873W·h。
As shown in table 2, data of a high efficiency discharge operating section of the vehicle 1 is shown:
table 2 a data relationship table for high efficiency discharge operating mode segments of vehicle 1
Taking 11 micro constant-speed sections with complete time length, and calculating the accumulated average energy f corresponding to each micro constant-speed section according to a formula 3 and a formula 4 i And discharge energy X of each micro constant speed section i With corresponding accumulated average energy f i Deviation percentage p of (2) i ：
f 2 =3633W·h，f 3 =3611W·h，f 4 =3584W·h，f 5 =3603W·h，f 6 =3591W·h，f 7 =3611W·h，f 8 =3621W·h，f 9 =3621W·h，f 10 =3616W·h，f 11 =3614W·h；
p 2 =-1.2%，p 3 =-2.2%，p 4 =2.1%，p 5 =-1.6%，p 6 =3.3%，p 7 =2.0%，p 8 =0.1%，p 9 =-1.4%，p 10 =-0.6%， p 11 =-1.1%。
From the calculation result, the deviation percentage p 2 ~p 11 All are within + -5% of the normal fluctuation range, so that the high-efficiency discharge working condition section of the vehicle 1 is judged to have no energy fluctuation abnormality and does not need correction. And calculating the discharge energy EH of the high-efficiency discharge working condition section to be 41339.
Calculating the discharge energy E per CLTC cycle of the CLTC multi-cycle operating segment of the vehicle 1 l （E 1 =3838W·h，E 2 =3004W·h，E 3 =2830W·h，E 4 =2701W·h，E 5 =2637 w·h) and mileage S per CLTC cycle l （S 1 =14.39km，S 2 =14.33km，S 3 =14.36km，S 4 =14.38km，S 5 = 14.37 km). Discharging energy of all CLTC cycles of the CLTC multi-cycle working condition section and the efficient discharging working condition sectionThe discharge energy EH is accumulated to obtain the total discharge energy E of 56349 W.h.
Calculating the electricity consumption weighting factor K according to the formula 5 l ，K 1 =0.0681，K 2 =0.0533，K 3 =0.0502，K 4 =0.0479，K 5 = 0.7804; the average power consumption M was 191 W.h/km calculated according to the formula 6, and the low-temperature range of the vehicle 1 was 294km.
The result was less than 1% different from the range obtained by continuous process test.
Illustratively, the vehicle 4 is tested for low range flash based on a low range flash test operating condition consisting of a continuous 5 CLTC cycles and a high efficiency discharge operating segment at a constant speed of 110km/h. And divides the high-efficiency discharging working condition section of the vehicle 4 into an accelerating section and 11 micro constant speed sections, wherein the first 10 micro constant speed sections are full-duration micro constant speed sections. Calculating discharge energy X of acceleration section Acceleration of The discharge energy of the 11 micro constant speed sections is 556: x is X 1 =4073W·h，X 2 =4089W·h，X 3 =4030W·h，X 4 =4050W·h，X 5 =4045W·h，X 6 =4028W·h，X 7 =4033W·h，X 8 =4021W·h，X 9 =4537W·h，X 10 =4494W·h，X 11 =1029W·h。
As shown in table 3, data of a high efficiency discharge operating section of the vehicle 4 is shown:
TABLE 3 data relationship table for efficient discharge operating conditions for vehicle 4
Taking 10 micro constant-speed sections with complete time length, and calculating the accumulated average energy f corresponding to each micro constant-speed section according to a formula 3 and a formula 4 i And discharge energy X of each micro constant speed section i With corresponding accumulated average energy f i Deviation percentage p of (2) i ：
f 2 =4037W·h，f 3 =4081W·h，f 4 =4046W·h，f 5 =4061W·h，f 6 =4057W·h，f 7 =4053W·h，f 8 =4050W·h，f 9 =4046W·h，f 10 =4101W·h；
p 2 =0.4%，p 3 =-1.2%，p 4 =-0.3%，p 5 =-0.4%，p 6 =-0.7%，p 7 =-0.5%，p 8 =-0.7%，p 9 =12.1%，p 10 =9.6%。
From the calculation results, the deviation percentage p of the 9 th and 10 th micro constant speed sections 9 And p 10 Exceeding the normal fluctuation range by + -5%, so that the discharge energy of the 9 th and 10 th micro constant speed sections is corrected to make X 9 =f 9 ，X 10 =f 10 The method comprises the steps of carrying out a first treatment on the surface of the And calculating the discharge energy EH of the high-efficiency discharge working condition section to be 42101.
Calculating the discharge energy E per CLTC cycle of the CLTC multi-cycle operating segment of the vehicle 4 l （E 1 =4810W·h，E 2 =3745W·h，E 3 =3516W·h，E 4 =3532W·h，E 5 =3528 w·h) and mileage S per CLTC cycle l （S 1 =14.36km，S 2 =14.38km，S 3 =14.37km，S 4 =14.38km，S 5 = 14.37 km). And accumulating the discharge energy of all the CLTC cycles of the CLTC multi-cycle working condition section with the discharge energy EH of the high-efficiency discharge working condition section to obtain the total discharge energy E of 61232 W.h.
Calculating the electricity consumption weighting factor K according to the formula 5 l ，K 1 =0.0785，K 2 =0.0612，K 3 =0.0574，K 4 =0.0577，K 5 = 0.7452; the average power consumption M is 253 W.h/km calculated according to the formula 6, and the low-temperature driving range of the vehicle 4 is 242km finally calculated.
The result was less than 1% different from the range obtained by continuous process test. If no energy correction is performed, the difference is about 5%.
In the embodiment of the application, the low-temperature driving range rapid test working condition suitable for the low-temperature discharge process of all vehicle types is determined based on the low-temperature energy change rule of the vehicle, the rapid test is carried out according to the low-temperature driving range rapid test working condition, the energy correction is carried out, and the deviation of the low-temperature driving range calculation result is reduced, so that the efficiency of the low-temperature driving range test is improved, the accuracy of the low-temperature driving range calculation result is improved, and the universality of the low-temperature driving range test method is enhanced.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 5, electronic device 500 includes one or more processors 501 and memory 502.
The processor 501 may be a Central Processing Unit (CPU) or other form of processing unit having data processing and/or instruction execution capabilities and may control other components in the electronic device 500 to perform desired functions.
Memory 502 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on the computer readable storage medium and executed by the processor 501 to implement the method for rapid low temperature range measurement and/or other desired functions of a blade electric vehicle according to any of the embodiments of the present application described above. Various content such as initial arguments, thresholds, etc. may also be stored in the computer readable storage medium.
In one example, the electronic device 500 may further include: an input device 503 and an output device 504, which are interconnected by a bus system and/or other form of connection mechanism (not shown). The input device 503 may include, for example, a keyboard, a mouse, and the like. The output device 504 may output various information to the outside, including early warning prompt information, braking force, etc. The output device 504 may include, for example, a display, speakers, a printer, and a communication network and remote output apparatus connected thereto, etc.
Of course, only some of the components of the electronic device 500 that are relevant to the present application are shown in fig. 5 for simplicity, components such as buses, input/output interfaces, etc. are omitted. In addition, the electronic device 500 may include any other suitable components depending on the particular application.
In addition to the above-described methods and apparatus, embodiments of the present application may also be a computer program product comprising computer program instructions which, when executed by a processor, cause the processor to perform the steps of a method for fast testing low-temperature range of a blade electric vehicle provided by any of the embodiments of the present application.
The computer program product may write program code for performing operations of embodiments of the present application 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 user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server.
In addition, an embodiment of the present application may also be a computer readable storage medium, on which computer program instructions are stored, which when executed by a processor, cause the processor to execute the steps of a method for quickly testing a low-temperature range of a pure electric vehicle provided by any embodiment of the present application.
The computer readable storage medium may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used in this specification, the terms "a," "an," "the," and/or "the" are not intended to be limiting, but rather are to be construed as covering the singular and the plural, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements.
It should also be noted that the positional or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application.
Claims (9)
1. A method for rapidly testing low-temperature driving range of a pure electric vehicle is characterized by comprising the following steps of:
s1, determining a low-temperature driving range rapid test working condition, wherein the low-temperature driving range rapid test working condition comprises a CLTC multi-cycle working condition section and a high-efficiency discharge working condition section;
s2, performing low-temperature driving range rapid test according to the low-temperature driving range rapid test working condition, and recording the discharge energy of the CLTC multi-cycle working condition section and the discharge energy of the high-efficiency discharge working condition section;
s3, judging whether the discharge process of the efficient discharge working condition section has energy fluctuation abnormality according to the discharge energy of the efficient discharge working condition section, and correcting the abnormal discharge energy of the efficient discharge working condition section if the energy fluctuation abnormality exists;
s4, calculating the low-temperature driving range according to the corrected discharge energy of the high-efficiency discharge working condition section and the discharge energy of the CLTC multi-cycle working condition section.
2. The method for rapidly testing the low-temperature range of the pure electric vehicle according to claim 1, wherein the step S1 of determining the rapid testing condition of the low-temperature range specifically comprises:
determining the CLTC circulation number P contained in the CLTC multi-circulation working condition section;
and determining the constant speed V of the high-efficiency discharging working condition section.
3. The method for rapidly testing the low-temperature driving range of the pure electric vehicle according to claim 2, wherein the determining the CLTC cycle number P contained in the CLTC multi-cycle operating condition segment includes:
calculating a moving average Q of discharge energy of the vehicle for sequentially successive 3 CLTC cycles j The formula is:
，j≥2
wherein W is j The discharging energy of each CLTC cycle is obtained according to a conventional working condition method, and j is the serial number of the CLTC cycle under the conventional working condition method;
according to two adjacent moving average values Q j And Q j-1 Calculating the difference Q of the moving average j difference value According to the difference Q of the moving average j difference value With the corresponding moving average value Q j Is calculated as the ratio of the difference percentage Q Percentage of j difference ；
Recording the difference percentage Q Percentage of j difference A sequence number j of CLTC cycles less than a preset percentage for the first time;
and counting the serial numbers j of the CLTC cycles recorded by a plurality of groups of vehicles, and determining the serial number j of the CLTC cycle with the highest duty ratio as the CLTC cycle number P contained in the CLTC multi-cycle working condition section.
4. The method for rapidly testing the low-temperature driving range of the pure electric vehicle according to claim 1, wherein the step S2 of calculating the discharge energy of the efficient discharge working condition section specifically comprises the following steps:
dividing the high-efficiency discharge working condition section into an acceleration section and m+1 micro constant speed sections;
calculating the discharge energy X of the acceleration section Acceleration of Discharge energy X of each of the micro constant speed sections i Where i is the sequence number of each of the micro constant speed sections, i=1, 2, …, m+1;
the discharge energy EH of the efficient discharge working condition section is equal to the discharge energy X of the acceleration section Acceleration of Discharge energy X with each of the micro constant speed sections i Is a sum of (a) and (b).
5. The method for rapidly testing the low-temperature driving range of the pure electric vehicle according to claim 4, wherein the step S3 of determining whether the energy fluctuation abnormality exists in the discharging process of the efficient discharging working condition segment according to the discharging energy of the efficient discharging working condition segment, and if the energy fluctuation abnormality exists, correcting the abnormal discharging energy of the efficient discharging working condition segment includes:
calculating the accumulated average energy f corresponding to the micro constant speed section i Wherein, i=2, m;
calculating the discharge energy X of each micro constant speed section i And the corresponding accumulated average energy f i Deviation percentage p of (2) i Judging the deviation percentage p i Whether the normal fluctuation range is exceeded;
if the deviation percentage p i If the energy fluctuation of the micro constant speed section exceeds the normal fluctuation range, judging that the energy fluctuation of the micro constant speed section is abnormal, and discharging the discharge energy X of the micro constant speed section with abnormal energy fluctuation i Correcting;
discharge energy X to complete each of the micro constant speed sections i After the correction, the discharge energy EH of the high-efficiency discharge working condition section is synchronously corrected.
6. The method for rapidly testing the low-temperature driving range of the pure electric vehicle according to claim 5, wherein the discharge energy X of the micro constant-speed section with abnormal energy fluctuation is i The correction specifically comprises the following steps:
the accumulated average energy f corresponding to the micro constant speed section with abnormal energy fluctuation i Discharge energy X as a micro constant speed section of the energy fluctuation abnormality i And (5) performing correction.
7. The method for rapidly testing the low-temperature range of the pure electric vehicle according to claim 1, wherein the step S4 of calculating the low-temperature range according to the corrected discharge energy of the high-efficiency discharge operating mode segment and the discharge energy of the CLTC multi-cycle operating mode segment comprises:
s41, calculating the total discharge energy E of the vehicle, wherein the total discharge energy E of the vehicle is equal to the sum of the discharge energy of the CLTC multi-cycle working condition section and the discharge energy EH of the high-efficiency discharge working condition section;
s42, according to the discharge energy E of each CLTC cycle in the CLTC multi-cycle working condition section l The duty cycle in the total discharge energy E, determining the electricity consumption weighting factor K l The formula is:
wherein l is the serial number of each CLTC cycle contained in the CLTC multi-cycle working condition section under the low-temperature driving range rapid test method, and P is the CLTC cycle number contained in the CLTC multi-cycle working condition section;
s43, according to the electricity consumption weighting factor K l And the discharge energy E of each CLTC cycle in the CLTC multi-cycle operating mode section l The average power consumption M is calculated, and the formula is as follows:
wherein S is l Mileage for each of the CLTC cycles;
and S44, calculating the low-temperature driving range S of the vehicle according to the total discharge energy E and the average power consumption M, wherein the low-temperature driving range S is equal to the ratio of the total discharge energy E to the average power consumption M.
8. An electronic device, the electronic device comprising:
a processor and a memory;
the processor is used for executing the steps of the low-temperature range rapid test method of the pure electric vehicle according to any one of claims 1 to 7 by calling a program or instructions stored in the memory.
9. A computer-readable storage medium storing a program or instructions that cause a computer to execute the steps of a method for rapidly testing a low-temperature range of a blade electric vehicle according to any one of claims 1 to 7.
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