CN114509683A - Electric balance testing method for standard working condition of whole vehicle - Google Patents
Electric balance testing method for standard working condition of whole vehicle Download PDFInfo
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Abstract
An electric balance test method for a finished automobile standard working condition relates to the technical field of finished automobile electric balance test. The invention aims to solve the problem that in the existing automobile manufacturing industry, the whole automobile electric balance test method is realized based on the NEDC working condition, so that the test result is not suitable for evaluating the electric balance of the Chinese automobile. The whole vehicle electrical balance testing method is realized based on the CLTC-P working condition, a vehicle to be tested is placed in a hub environment cabin, the initial SOC of a vehicle-mounted storage battery is 70%, the temperature of the hub environment cabin is set as a testing temperature, when the temperature of the hub environment cabin reaches the set testing temperature, the temperature is maintained for 8 hours, then the hub rotating equipment starts to rotate, and the vehicle is driven to run according to the CLTC-P working condition until the test is finished; and judging according to the data acquired in the test process, and if the actual electric quantity requirement of the vehicle reaches the target value and the SOC of the storage battery is greater than or equal to that before the test, determining that the test is qualified. The invention is suitable for the electric balance test of the whole vehicle standard working condition of the Chinese vehicle.
Description
Technical Field
The invention relates to the technical field of automobile testing, in particular to a whole automobile electric balance testing technology.
Background
With the development of the intelligent networking technology of automobiles, the increase of electronic and electrical assemblies, particularly controllers and loads, on the automobiles urgently needs to provide a stable power supply system for the whole automobiles, so that the electric balance of the whole automobiles needs to be effectively and accurately tested. In addition, most of the users oriented to each domestic main engine plant are domestic users, so that how to verify whether the whole vehicle power supply network meets the driving requirements of the domestic users is imperative.
In the existing test method for the electric balance under the standard working condition of the whole vehicle, data acquisition equipment and a current sensor are adopted to acquire the charging and discharging current of a storage battery. The vehicle is dynamically tested on the road, and the NEDC working condition is mostly used in the current standard working condition. And after the dynamic test is finished, judging whether the whole vehicle is in an electric balance state according to the charging and discharging current of the storage battery acquired by the data acquisition equipment.
In the existing testing method, firstly, the NEDC working condition does not accord with the national situation of China, and the actual driving condition of domestic users cannot be reflected better; in addition, tests on roads have certain regional limitations, and certain deviation is generated on test results due to the influences on the vehicle speed and the ambient temperature.
Disclosure of Invention
The invention aims to solve the problem that in the existing automobile manufacturing industry, a whole automobile electrical balance test method is realized based on the NEDC working condition, and the difference between the NEDC working condition and the actual road condition of China is large, so that the test result is not suitable for the evaluation of the electrical balance of the Chinese automobile.
The electric balance test method of the whole vehicle standard working condition is realized based on the CLTC-P working condition, the vehicle to be tested is placed in a hub environment cabin, the initial SOC of a vehicle-mounted storage battery is 70%, the temperature of the hub environment cabin is set as a test temperature, when the temperature of the hub environment cabin reaches the set test temperature, the hub environment cabin is maintained for 8 hours, and then the following steps are started;
starting an engine, sequentially turning on corresponding vehicle electric equipment when waiting for the idling to be in a normal working state, and maintaining the turning-on state of the vehicle electric equipment until the following test is finished;
rotating the hub rotating equipment, and driving the vehicle to run according to the CLTC-P working condition until the test is finished; monitoring a charge-discharge current signal of the vehicle-mounted storage battery, a generator output current signal, a terminal voltage signal of the vehicle-mounted storage battery, a SOC (state of charge) state parameter of the vehicle-mounted storage battery and a measured environment temperature in the process;
and analyzing the data acquired in the test process, and if the actual electric quantity demand of the vehicle reaches the target value and the SOC of the storage battery is greater than or equal to that before the test, determining that the test is qualified.
Further, the target value is the electric quantity demand of the vehicle under the standard working condition.
Further, the test temperature comprises a low-temperature environment test temperature and a high-temperature environment test temperature, the low-temperature environment test temperature simulates a cold environment and simulates the temperature of snow in winter and night; the high-temperature environment test temperature simulates a thermal environment and simulates the temperature in summer and rainy night.
Preferably, the low-temperature environment test temperature is-20 ℃, and the high-temperature environment test temperature is 20 ℃.
Further, the test temperature is a low-temperature environment test temperature, and the sequentially opened vehicle electric equipment is as follows: low beam, high beam, front/rear fog, turn signal, rear window heating, rear mirror heating, seat trim, air conditioner-low speed blast e, air conditioner-medium speed blast e, air conditioner-high speed blast e, wiper-high speed, wiper-low speed, front wiper-intermittent mode, rear wiper-intermittent mode, in-vehicle entertainment system, vehicle telematics system, 12V outlet, four-sided window/sunroof, other electronic and electrical configurations.
Further, the test temperature is a high-temperature environment test temperature, and the sequentially opened vehicle electric equipment comprises: clearance lights and instrument lighting, dipped headlights, high beams, front/rear fog lights, turn signals, seat adjustments, air conditioning-low speed air supply e, air conditioning-medium speed air supply e, air conditioning-high speed air supply e, wiper-high speed, wiper-low speed, front wiper-intermittent mode, rear wiper-intermittent mode, in-vehicle entertainment systems, vehicle telematics systems, 12V power outlets, four-sided windows/skylights, other electrical and electronic configurations.
Further, before testing, the vehicle-mounted storage battery is calibrated.
Preferably, the method for calibrating the vehicle-mounted storage battery comprises the following steps:
carrying out three times of capacity tests on the vehicle-mounted storage battery, if the capacity of the three times of tests is not lower than 95% of the rated capacity of the vehicle-mounted storage battery, carrying out the next step, otherwise, the vehicle-mounted storage battery is unqualified;
and setting an initial value of the SOC of the vehicle-mounted storage battery according to the regulation of GB/T5008.1, and finishing the calibration of the vehicle-mounted storage battery.
Preferably, the method for setting the initial value of the SOC of the vehicle-mounted battery according to the regulation of GB/T5008.1 is:
discharging the vehicle-mounted storage battery to the terminal voltage of the vehicle-mounted storage battery at the current I20 with the discharge rate of 20 hours within 10.5V +/-0.05V;
charging the vehicle-mounted storage battery according to the type of the vehicle-mounted storage battery and the regulation of 5.2.2 in the GB/T5008.1 standard, and recording the charging current and voltage;
discharging the vehicle-mounted storage battery again according to the current I20, wherein the duration and the corresponding initial value of the SOC of the storage battery are as follows:
the duration is 4 hours, and the initial value of the SOC of the storage battery is 80 percent;
the duration is 8 hours, and the initial value SOC of the storage battery is 60 percent;
for a duration of 10 hours, the initial value of the battery SOC is 50%.
The method has the following beneficial effects:
1. the method is designed based on the working condition of China, so that the test result is more suitable for the electric balance test of the vehicle running in China.
CLTC-P (China light-duty vehicle test Cycle-passenger) is a working condition standard of a passenger vehicle part in GB/T38146 China automobile driving working conditions (CATC, China automatic test Cycle), and the standard is based on standard working conditions defined by 41 cities, 3832 vehicles, 3278 kilometers of accumulated 20 hundred million GIS traffic low-frequency dynamic big data, so that compared with the NEDC working conditions, the CLTC working conditions increase wider road condition information, and the CLTC-P comprises the following steps: urban working conditions, suburban working conditions and high-speed working conditions, and the cycle time is 1800 s. And the highest speed and the average speed are lower than the requirement of the NEDC working condition, which is better matched with the requirement of high-speed regulation in China and the big data collected by the traffic GIS at present. The partial difference between the NEDC operating condition and the CLTC operating condition is shown in fig. 4, where the test time and the test mileage are both longer than those of the NEDC operating condition, but the high-speed vehicle speed and the average vehicle speed are both lower, and the average power is also lower.
In addition, compared with the NEDC working condition, the CLTC-P working condition has a significantly increased proportion of acceleration and deceleration, up to 35% to 43%, which also reflects an increase in severity of the CLTC-P working condition on the cycle working condition, and this setting is matched with big data collected by the traffic GIS, for example: frequent traffic light parking conditions in road conditions of China.
In summary, in short, the CLTC operating mode can more truly reflect the road condition of the motor vehicle in china, and specifically includes the following aspects:
1. more reasonable definition of average vehicle speed and maximum vehicle speed;
2. wider driving conditions;
3. a more reasonable parking mode proportion;
4. and the dynamic acceleration and deceleration working conditions are richer.
Therefore, the testing under the NEDC working condition can not truly reflect the state of the electric balance of the whole vehicle after the vehicle runs under the domestic road condition. The verified data is not representative or insufficient, and if the data is serious, the vehicle storage battery is in power shortage after the vehicle runs, the vehicle cannot be started, and the user experience is influenced.
In conclusion, the invention designs the electric balance test method suitable for the whole vehicle standard working condition of the CLTC-P working condition, the electric balance state of the whole vehicle can be truly reflected by the result obtained by the test of the method, and the condition that the storage battery is insufficient in the running process of the vehicle can not occur when the qualified vehicle is tested by the test method.
2. The invention is realized by adopting the rotating hub environment bin abandoned by the personnel in the field in the electric balance test of the standard working condition of the whole vehicle.
The existing electric balance test method for the whole vehicle standard working condition adopts a bench test or a road test, the bench test and the road test are long in test period, and the test cost is high. The invention does not use the thought of the existing test method, but adopts the hub rotating environment cabin which is not used by people in the field for carrying out the electric balance test of the standard working condition of the whole vehicle for testing.
The test of the electric balance of the whole vehicle is simulated by the special equipment for the electric balance test of the whole vehicle, more generators suitable for the work of model selection and the like in the vehicle development stage can not effectively verify the actual electric balance state after the whole vehicle system is carried. Therefore, in the vehicle manufacturing process, the subsequent road test of the whole vehicle is still required to effectively verify the electric balance of the whole vehicle.
In the road test, data verification is performed by running a test vehicle on an actual road surface. During road test, the requirements of environmental temperature and vehicle speed in the driving process need to be ensured. And the electric balance test needs to be verified under different working conditions at different temperatures. Therefore, the requirements on external environmental factors including weather and road conditions are high, and the test period is long.
The rotating hub environment bin adopted by the invention has the inherent functions of simulating the automobile road test and carrying out the tests of oil consumption, emission and the like. The invention adopts the hub environment bin to design an electric balance test method of the standard working condition of the whole vehicle, and uses the hub environment bin to respectively simulate the cold environment and the hot environment for respective test, thereby completing the test of the two environments in a short time. In addition, the experiment in the hub rotating bin does not need to consider the complexity of the actual road condition, the moment, the damping and the like of the automobile road driving are simulated only by a driver in the hub rotating bin according to set parameters, the acceleration and brake pedals are controlled according to the relation between the speed and the time required in the CLTC-P, the speed of the automobile and the curve in the driver assistant screen are controlled within the deviation range, the experiment period is greatly shortened, and the operation difficulty is reduced. And the data acquired in the test process is more accurate, the deviation is smaller, and the numerical value is more effective.
The test method is designed based on the working conditions of China, the test result is closer to the verification method of the actual driving condition, the verification of whether the power supply network meets the electric quantity requirement of the electric load of the vehicle is realized, and meanwhile, enough electric quantity is stored.
The invention is applied to the electric balance test of the whole vehicle standard working condition of the vehicle, can greatly improve the test efficiency and can realize the test of the hot environment and the cold environment.
Drawings
Fig. 1 is a schematic diagram of a principle of collecting parameters during a vehicle test process in an electric balance test method for a standard operating condition of a finished vehicle according to an embodiment.
Vehicle speed data obtained by testing under CLTC-P conditions as described in the first embodiment of FIG. 2.
Fig. 3 is a table of load operation conditions of the vehicle electric device according to the sixth embodiment.
FIG. 4 is a partial difference between the NEDC operating condition and the CLTC operating condition.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, several embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, but the embodiments described below are only a part of the embodiments claimed in the present application, and not all of the embodiments.
The electric balance test method for the whole vehicle standard working condition is realized based on the CLTC-P working condition, and comprises the following steps:
placing a vehicle to be detected in a hub environment cabin, setting the initial SOC of a vehicle-mounted storage battery to be 70%, setting the temperature of the hub environment cabin to be a testing temperature, and maintaining the temperature of the hub environment cabin for 8 hours after the temperature of the hub environment cabin reaches the set testing temperature, and then starting the following steps;
starting an engine, sequentially opening corresponding vehicle electric equipment when waiting for idling to be in a normal working state, and maintaining the opening state of the vehicle electric equipment until the following test is finished;
rotating the hub rotating equipment, and driving the vehicle to run according to the CLTC-P working condition until the test is finished; monitoring a charge-discharge current signal of the vehicle-mounted storage battery, a generator output current signal, a terminal voltage signal of the vehicle-mounted storage battery, a SOC (state of charge) state parameter of the vehicle-mounted storage battery and a measured environment temperature in the process;
and analyzing the data acquired in the test process, and if the electric quantity requirement reaches a target value and the SOC of the storage battery is greater than or equal to that before the test, determining that the test is qualified.
The target value is set according to design requirements.
In actual operation, when a vehicle is placed in the hub environment cabin, corresponding sensors and testing instruments should be connected to collect parameters to be monitored in the testing process. For example: referring to fig. 1, a current sensor is used for acquiring charge and discharge current signals of a storage battery, a current sensor is used for acquiring current signals output by a generator, and a voltage sensor is used for acquiring terminal voltage signals of the storage battery; the environment temperature signal of the environment where the vehicle to be detected is located is acquired through the temperature sensor, and the current sensor, the voltage sensor and the temperature sensor respectively output the acquired signals to the data acquisition equipment.
The data acquisition equipment reads the SOC state information of the vehicle storage battery in the test process and the speed signal of the vehicle to be tested in the driving process through the CAN bus of the vehicle to be tested.
The whole vehicle electric balance test comprises a static electric quantity demand test, a standard working condition electric quantity demand test and a dynamic electric quantity demand test.
In the embodiment, the test is carried out in the hub environment cabin, the temperature of the hub environment cabin is set as the test temperature, the process is a vehicle immersion process after the interior of the hub environment cabin reaches the set test temperature and lasts for 8 hours, and the purpose is to ensure that the temperature inside and outside the vehicle to be tested is the same as the temperature of the test environment, so that the state of the vehicle to be tested is the same as the real state, and then the test is started.
The vehicle is driven according to the CLTC-P working condition in the embodiment to run until the test is completed, and the obtained speed curve graph is shown in fig. 2.
In the second embodiment, the electric balance test method for the vehicle standard working condition is further limited, and in the first embodiment, the target value is the electric quantity demand of the vehicle standard working condition.
The electric quantity requirement of the vehicle under the standard working condition is set before testing, for example: it may be set to 70% of the on-board battery capacity of the vehicle to be tested.
In the third embodiment, the electric balance test method for the standard working condition of the whole vehicle according to the first or second embodiment is further limited, in the first embodiment, the test temperature includes a low-temperature environment test temperature and a high-temperature environment test temperature, and the low-temperature environment test temperature simulates a cold environment and simulates the temperature of snow in winter; the high-temperature environment test temperature simulates a thermal environment and simulates the temperature in summer and rainy night.
In the actual test process, the hot environment and the cold environment are respectively tested, and the test process of each environment is the same.
In the fourth embodiment, the method for testing the electrical balance under the standard working condition of the whole vehicle is further defined, in the fourth embodiment, the low-temperature environment testing temperature is-20 ℃, and the high-temperature environment testing temperature is 20 ℃.
The present embodiment gives a low-temperature environment test temperature and a high-temperature environment test temperature that are commonly used. In the actual test process, the low-temperature environment test temperature and the high-temperature environment test temperature can be set according to requirements.
Fifth embodiment is a further limitation of the sequentially turned-on vehicle electric devices in the electric balance test method for vehicle standard conditions according to the third embodiment, and in the present embodiment,
the test temperature is low-temperature environment test temperature, and the vehicle electric equipment that opens in proper order is: clearance lights and instrument lighting, dipped headlights, high beams, front/rear fog lights, turn signals, rear window heating, rear mirror heating, seat trim, air conditioning-low speed blow e, air conditioning-medium speed blow e, air conditioning-high speed blow e, wiper-high speed, wiper-low speed, front wiper-intermittent mode, rear wiper-intermittent mode, in-vehicle entertainment systems, vehicle telematics systems, 12V power outlets, four windows/skylights, other electrical and electronic configurations.
In a low-temperature environment, for heating related electric devices, for example: the heating of the rear air window, the heating of the rearview mirror and the heating of the seat are all required to be started. The dynamic energy requirements for controlling the various consumers described above during the test are shown in fig. 3.
In the sixth embodiment, the electrical balance test method for vehicle standard conditions according to the third embodiment is further limited to the electrical devices of the vehicle that are turned on sequentially, and in the third embodiment,
the test temperature is a high-temperature environment test temperature, and the sequentially opened vehicle electric equipment comprises: clearance lights and instrument lighting, low beam lights, high beam lights, front/rear fog lights, turn lights, seat adjustments, air conditioning-medium speed blast e, wiper-high speed, wiper-low speed, rear wiper-intermittent mode, in-vehicle entertainment systems, vehicle telematics systems, 12V power outlets, four-sided windows/skylights, other electronic and electrical configurations.
The dynamic energy requirements for controlling the various consumers described above during the test are shown in fig. 3.
In a high-temperature environment, for heating related electric equipment, for example: the heating of the rear air window, the heating of the rearview mirror and the heating of the seat do not need to be started.
The load operation conditions of the vehicle electric device according to the present embodiment and the fifth embodiment are shown in fig. 3. In the figure, "-" indicates false addition, and "□" indicates not to be turned on.
In the present embodiment, before the test, the vehicle-mounted storage battery is calibrated.
Before testing, the vehicle-mounted storage battery is calibrated so as to ensure the reliability of the performance of the vehicle-mounted storage battery.
In an eighth embodiment, the present embodiment is further limited to the electrical balance testing method for vehicle standard conditions in the seventh embodiment, and in the present embodiment, the method for calibrating the vehicle-mounted storage battery is as follows:
carrying out three times of capacity tests on the vehicle-mounted storage battery, if the capacity of the three times of tests is not lower than 95% of the rated capacity of the vehicle-mounted storage battery, carrying out the next step, otherwise, the vehicle-mounted storage battery is unqualified;
and setting an initial value of the SOC of the vehicle-mounted storage battery according to the regulation of GB/T5008.1, and finishing the calibration of the vehicle-mounted storage battery.
In the embodiment, the capacity of the vehicle-mounted storage battery is tested for three times, so that the reliability of the performance of the storage battery is ensured. If the test result of any one time is that the capacity is lower than 95% of the rated capacity of the storage battery, the storage battery is considered to have quality defects and is replaced, and other storage batteries are replaced to be used as vehicle-mounted storage batteries for carrying out electric balance test.
In the eighth embodiment, the method for setting the initial SOC value of the on-board battery according to the regulation of GB/T5008.1 is further defined as:
discharging the vehicle-mounted storage battery to the terminal voltage of the vehicle-mounted storage battery at the current I20 with the discharge rate of 20 hours within 10.5V +/-0.05V;
charging the vehicle-mounted storage battery according to the type of the vehicle-mounted storage battery and the regulation of 5.2.2 in the GB/T5008.1 standard, and recording the charging current and voltage;
discharging the vehicle-mounted storage battery again according to the current I20, wherein the duration and the corresponding initial value of the SOC of the storage battery are as follows:
the duration is 4 hours, and the initial value of the SOC of the storage battery is 80 percent;
the duration is 8 hours, and the initial value SOC of the storage battery is 60 percent;
for a duration of 10 hours, the initial value of the battery SOC is 50%.
In the present embodiment, the initial value of SOC is set for the in-vehicle battery according to the corresponding national standard.
The above embodiments are distance descriptions of the electric balance testing method for the standard working condition of the whole vehicle, and do not limit the protection scope of the invention.
Claims (9)
1. The electric balance test method of the whole vehicle standard working condition is characterized in that the method is realized based on the CLTC-P working condition, and the method comprises the following steps:
placing a vehicle to be detected in a hub environment cabin, setting the initial SOC of a vehicle-mounted storage battery to be 70%, setting the temperature of the hub environment cabin to be a testing temperature, and maintaining the temperature of the hub environment cabin for 8 hours after the temperature of the hub environment cabin reaches the set testing temperature, and then starting the following steps;
starting the engine, and sequentially turning on corresponding vehicle electric equipment when waiting for the idling to be in a normal working state;
rotating the hub rotating equipment, and driving the vehicle to run according to the CLTC-P working condition until the test is finished; monitoring a charge-discharge current signal of the vehicle-mounted storage battery, a generator output current signal, a terminal voltage signal of the vehicle-mounted storage battery, a SOC (state of charge) state parameter of the vehicle-mounted storage battery and a measured environment temperature in the process;
and analyzing the data acquired in the test process, and if the actual electric quantity demand of the vehicle reaches the target value and the SOC of the storage battery is greater than or equal to that before the test, determining that the test is qualified.
2. The method for testing the electric balance of the whole vehicle standard working condition according to claim 1, wherein the target value is the electric quantity demand of the vehicle standard working condition.
3. The electric balance test method for the standard working condition of the whole vehicle as claimed in claim 1, wherein the test temperature comprises a low-temperature environment test temperature and a high-temperature environment test temperature, the low-temperature environment test temperature simulates a cold environment and simulates the temperature of snow in winter; the high-temperature environment test temperature simulates a thermal environment and simulates the temperature in summer and rainy night.
4. The method for testing the electrical balance under the standard working condition of the whole vehicle as claimed in claim 1, wherein the low-temperature environment testing temperature is-20 ℃ and the high-temperature environment testing temperature is 20 ℃.
5. The electrical balance testing method for vehicle standard working condition according to claim 3,
the test temperature is low-temperature environment test temperature, and the vehicle electric equipment that opens in proper order is: clearance lights and instrument lighting, dipped headlights, high beams, front/rear fog lights, turn signals, rear window heating, rear mirror heating, seat trim, air conditioning-low speed blow e, air conditioning-medium speed blow e, air conditioning-high speed blow e, wiper-high speed, wiper-low speed, front wiper-intermittent mode, rear wiper-intermittent mode, in-vehicle entertainment systems, vehicle telematics systems, 12V power outlets, four windows/skylights, other electrical and electronic configurations.
6. The electrical balance testing method for vehicle standard working condition according to claim 3,
the test temperature is a high-temperature environment test temperature, and the sequentially opened vehicle electric equipment comprises: clearance lights and instrument lighting, dipped headlights, high beams, front/rear fog lights, turn signals, seat adjustments, air conditioning-low speed air supply e, air conditioning-medium speed air supply e, air conditioning-high speed air supply e, wiper-high speed, wiper-low speed, front wiper-intermittent mode, rear wiper-intermittent mode, in-vehicle entertainment systems, vehicle telematics systems, 12V power outlets, four-sided windows/skylights, other electrical and electronic configurations.
7. The method for testing the electrical balance of the standard working condition of the whole vehicle as claimed in claim 1, wherein before the test, the vehicle-mounted storage battery is calibrated.
8. The electric balance test method for the standard working condition of the whole vehicle as claimed in claim 7, wherein the method for calibrating the vehicle-mounted storage battery comprises the following steps:
carrying out three times of capacity tests on the vehicle-mounted storage battery, if the capacity of the three times of tests is not lower than 95% of the rated capacity of the vehicle-mounted storage battery, carrying out the next step, otherwise, the vehicle-mounted storage battery is unqualified;
and setting an initial value of the SOC of the vehicle-mounted storage battery according to the regulation of GB/T5008.1, and finishing the calibration of the vehicle-mounted storage battery.
9. The electric balance test method for the standard working condition of the whole vehicle as claimed in claim 8, wherein the method for setting the initial value of the SOC of the vehicle-mounted storage battery according to the regulation of GB/T5008.1 is as follows:
discharging the vehicle-mounted storage battery to the terminal voltage of the vehicle-mounted storage battery at the current I20 with the discharge rate of 20 hours within 10.5V +/-0.05V;
charging the vehicle-mounted storage battery according to the type of the vehicle-mounted storage battery and the regulation of 5.2.2 in the GB/T5008.1 standard, and recording the charging current and voltage;
discharging the vehicle-mounted storage battery again according to the current I20, wherein the duration and the corresponding initial value of the SOC of the storage battery are as follows:
the duration is 4 hours, and the initial value of the SOC of the storage battery is 80 percent;
the duration is 8 hours, and the initial value SOC of the storage battery is 60 percent;
for a duration of 10 hours, the initial value of the battery SOC is 50%.
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| WO2024012083A1 (en) * | 2022-07-12 | 2024-01-18 | 中国第一汽车股份有限公司 | System, method and apparatus for soc precision verification during vehicle operation process, and upper computer |
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