CN117686237A - Calibration method for cooling system of pure electric vehicle - Google Patents
Calibration method for cooling system of pure electric vehicle Download PDFInfo
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- CN117686237A CN117686237A CN202311618564.7A CN202311618564A CN117686237A CN 117686237 A CN117686237 A CN 117686237A CN 202311618564 A CN202311618564 A CN 202311618564A CN 117686237 A CN117686237 A CN 117686237A
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- 238000001816 cooling Methods 0.000 title claims abstract description 179
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 155
- 238000013461 design Methods 0.000 claims abstract description 34
- 238000005265 energy consumption Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 238000004088 simulation Methods 0.000 claims description 25
- 239000000110 cooling liquid Substances 0.000 claims description 13
- 230000007613 environmental effect Effects 0.000 claims description 9
- 238000004378 air conditioning Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 230000009194 climbing Effects 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 4
- 239000002826 coolant Substances 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
The invention discloses a calibration method of a cooling system of a pure electric vehicle, which comprises the steps of setting the design requirement of the cooling system, and adjusting the cooling system to be tested of the pure electric vehicle to ensure that the performance index of the cooling system meets the design requirement; confirming cooling system information to be acquired in a calibration test according to performance indexes to be calibrated of the cooling system; constructing a calibration test of the cooling system, setting a test environment and a vehicle working condition, and collecting cooling system information in the test environment and the vehicle working condition; processing cooling system information, calibrating a cooling system according to the processed cooling system information, and optimizing performance indexes of the cooling system; the method can accurately and comprehensively reflect the capacity of the cooling system of the vehicle, is standard in flow, comprehensive in calibration content, high in reliability and accurate in result, meets the cooling requirement of the vehicle, reduces the energy consumption of the whole vehicle by adjusting related parameters, and improves the endurance mileage of the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle cooling system design, in particular to a calibration method of a cooling system of a pure electric vehicle.
Background
At present, most automobile main engine factories develop the calibration of the cooling system of the pure electric automobile according to the traditional calibration method of the cooling system, the calibration flow is not standard, and the calibration result is inaccurate. By inquiring the existing literature, the pure electric vehicle cooling system calibration field lacks relevant guidance information. The calibration of the cooling system of the pure electric vehicle has an influence on the safety of the vehicle and the energy consumption of the whole vehicle, so that the method for calibrating the cooling system of the pure electric vehicle is necessary to be researched.
Disclosure of Invention
The invention aims to provide a calibration method for a cooling system of a pure electric vehicle, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a calibration method of a cooling system of a pure electric vehicle comprises the following steps:
setting the design requirement of a cooling system, and adjusting the cooling system to be tested of the pure electric vehicle to ensure that the performance index of the cooling system meets the design requirement;
confirming cooling system information to be acquired in a calibration test according to performance indexes to be calibrated of the cooling system;
constructing a calibration test of the cooling system, setting a test environment and a vehicle working condition, and collecting cooling system information in the test environment and the vehicle working condition;
and (3) processing the cooling system information, calibrating the cooling system according to the processed cooling system information, and optimizing the performance index of the cooling system.
Further, set up cooling system design requirement, adjust the cooling system that pure electric vehicles awaits measuring, make its performance index's parameter accord with the design requirement, still include:
and detecting performance indexes of the cooling system in the static state, the dynamic state and the NVH performance of the pure electric vehicle and in the whole vehicle state, so that the cooling system meets the design requirements of the cooling system.
Further, constructing a calibration test of the cooling system, setting a test environment and a vehicle working condition, and collecting cooling system information in the test environment and the vehicle working condition, and further comprising:
the environment bin simulation test is carried out, the test environment is simulated through the environment bin, and the cooling system information is collected under the vehicle working condition corresponding to the test environment;
road tests, including summer road tests and winter road tests, and collecting cooling system information under the corresponding vehicle working conditions of summer roads and winter roads.
Further, the environment bin simulation test simulates a test environment through the environment bin, and collects cooling system information under the vehicle working condition corresponding to the test environment, and the system further comprises:
the environment bin simulation test is to confirm that the electric quantity of the vehicle power battery is not less than the test standard electric quantity, and place the test vehicle in a laboratory of the environment simulation bin and fix the test vehicle on the chassis dynamometer, wherein the test standard electric quantity is the minimum electric quantity meeting the test requirement;
the test environment comprises a temperature environment, and after the temperature environment of a laboratory reaches a preset temperature range, the vehicle immersion time is not lower than the preset time, wherein the temperature environment comprises a high temperature environment, a normal temperature environment and a low temperature environment;
when the air conditioner is in a high-temperature environment, adjusting the air quantity of the air conditioner system to be the maximum value, adjusting the temperature to be the minimum value, and collecting information of a cooling system;
and in the low-temperature environment, adjusting the air quantity of the air conditioning system to be the maximum value, adjusting the temperature to be the maximum value, and collecting the information of the cooling system.
Further, the environment bin simulation test simulates a test environment through the environment bin, and collects cooling system information under the vehicle working condition corresponding to the test environment, and the system further comprises:
the vehicle working conditions corresponding to the environment of the environment bin simulation test comprise constant speed test, idle speed test, dynamic vehicle speed test, constant speed climbing test, CLTC (closed loop control) cycle test and DC (direct current) quick charge test, wherein the environment bin simulation test is based on environment bin conditions and simulates steady-state working conditions of a cooling system.
Further, the road test includes a summer road test and a winter road test, and collects cooling system information under vehicle conditions corresponding to the summer road and the winter road, and further includes:
the corresponding vehicle working conditions of the road test in summer comprise urban working condition tests, high-speed working condition tests, dynamic vehicle speed tests, suburban working condition tests, idle working condition tests and DC quick charging tests, and the corresponding vehicle working conditions of the road test in winter comprise urban working condition tests and DC quick charging tests, wherein the road test is set based on the working condition conditions used by users.
Further, the cooling system information is processed, the cooling system is calibrated according to the processed cooling system information, and the performance index is optimized, and the method further comprises the following steps:
transmitting cooling system information to the casape controller;
under the cooling requirements of a driving motor and a power battery, the duty ratio of a water pump, the duty ratio of a fan and the opening degree of a water valve are regulated by the CANape controller, so that the energy consumption of the whole vehicle is reduced.
Further, the method comprises the steps of:
arranging cooling system information received by the CANape controller;
judging whether the performance index of the cooling system meets the design requirement;
if the design requirement is not met, the rotation speed of the water pump and the fan and the opening degree of the water valve are increased through the CANape controller, and the performance of the cooling system is improved until the requirement is met.
Further, determining whether the performance index of the cooling system meets the design requirement further includes:
if the design requirement is met, judging whether the performance index of the cooling system is excessive;
if the cooling system is not excessive, confirming that the performance index of the current cooling system is a preferable value of the cooling system calibration;
if the water is excessive, the rotation speed of the water pump and the fan is reduced through the CANape controller, the opening of the water valve is reduced, and the energy consumption of the whole vehicle is reduced through adjusting the performance index of the cooling system.
Further, determining whether the performance index of the cooling system meets the design requirement further includes:
according to the formula q=c Cooling liquid m(T Required water temperature -T Actual water temperature ) And calculating whether the cooling requirement of the power battery and the driving motor is met.Wherein C is Cooling liquid And m is the mass of the cooling liquid.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a calibration method for a cooling system of a pure electric vehicle, which solves the defects of the traditional calibration method for the cooling system, can accurately and comprehensively reflect the cooling system capacity of the vehicle, has the advantages of standard flow, comprehensive calibration content, high reliability and accurate result, meets the cooling requirement of the vehicle, reduces the energy consumption of the whole vehicle by adjusting related parameters, and improves the endurance mileage of the vehicle.
Drawings
Fig. 1 is a flowchart of a calibration method of a cooling system of a pure electric vehicle in an embodiment of the invention;
FIG. 2 is a schematic diagram of the vehicle speed under urban conditions in an embodiment of the invention;
FIG. 3 is a flow chart of optimizing performance index of a cooling system according to the processed cooling system information by processing the cooling system information in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to the drawings in the specification, the invention provides a technical scheme that: as shown in fig. 1, the calibration method of the cooling system of the pure electric vehicle comprises the following steps:
s102, setting design requirements of a cooling system, and adjusting the cooling system to be tested of the pure electric vehicle to enable performance indexes of the cooling system to meet the design requirements;
specifically, the static state, the dynamic state, the NVH performance and the performance index of the cooling system in the whole vehicle state of the pure electric vehicle are detected, so that the pure electric vehicle meets the design requirement of the cooling system.
Wherein the vehicle stationary state detection includes the following: confirming that the trend and connection of the cooling pipeline, the air deflector, the vehicle air inlet grille, the cooling liquid and the static pressure of the air conditioner meet the design requirements; the vehicle dynamic detection includes the following: confirming that the air quantity adjusting function, the air conditioner internal and external circulation function, the control panel key, the temperature adjusting function, the instrument temperature display value, the fan working state and the water pump working state meet the design requirements; NVH performance detection comprises the following: confirming that noise of coolant flow water sound and coolant fan at high rotating speed and gear switching meets design requirements; the whole vehicle state detection comprises the following contents: confirming that the power-on and power-off functions and the display state of a driving instrument of the whole vehicle meet the design requirements; through the vehicle state inspection, the interference of the faults of the vehicle can be eliminated, the normal operation of the cooling system of the calibrated vehicle is ensured, and the accuracy of the calibration result of the cooling system is improved.
S104, confirming cooling system information to be acquired in a calibration test according to performance indexes to be calibrated of the cooling system;
the system comprises a cooling system, a sensor, a temperature sensor, a flow sensor, a temperature sensor and a temperature sensor, wherein the collected cooling system information is collected through the sensor, and the corresponding temperature sensor and flow sensor are arranged in a battery loop of the vehicle; arranging a corresponding temperature sensor and a corresponding flow sensor in a motor loop; arranging a corresponding temperature sensor, a corresponding flow sensor and a corresponding pressure sensor in the air conditioning loop; arranging corresponding temperature sensors in the passenger cabin and the external environment; a corresponding rotation speed sensor is arranged on the cooling fan; and collecting various parameter information of the cooling system required by the calibration of the cooling system through a sensor.
In this embodiment, the arrangement information of the sensors is referred to table 1, and the arrangement positions of the sensors can be appropriately adjusted according to different vehicle types.
Table 1 sensor arrangement list
S106, constructing a calibration test of the cooling system, setting a test environment and a vehicle working condition, and collecting cooling system information in the test environment and the vehicle working condition;
specifically, the environment bin simulation test is carried out, the test environment is simulated through the environment bin, and the cooling system information is collected under the vehicle working condition corresponding to the test environment; road tests, including summer road tests and winter road tests, and collecting cooling system information under the corresponding vehicle working conditions of summer roads and winter roads.
Under the condition that the environment bin simulation test supplements the limit working condition for the road test, the test of the performance of the vehicle cooling system, under the different vehicle working conditions of the pure electric vehicle cooling system calibration test, the relevant working information of a battery loop, a motor loop, a fan, a water pump and a water valve is collected, wherein the collected working information of the motor loop comprises: the water inlet temperature of the motor, the flow rate of the motor, the DCDC temperature, the internal temperature of the motor and the MCU request; the battery loop operation information that gathers includes: the water inlet temperature of the battery, the flow of the battery, the maximum temperature of the battery core, the minimum temperature of the battery core, the current and the SOC; the fan operation information includes: a fan duty cycle; the water pump working information comprises: the working duty ratio of the water pump; the water valve working information comprises: a water valve position signal; setting reasonable collection items, and accurately and efficiently reflecting whether the performance of a calibrated vehicle cooling system under different working conditions meets the cooling requirements of a driving motor and a power battery and whether the cooling performance is excessive; in this embodiment, the relevant information of the motor circuit, the battery circuit, the electric fan, the water pump, the three-way valve, and the four-way valve is collected with reference to table 2.
Table 2 collection items
S108, processing the cooling system information, calibrating the cooling system according to the processed cooling system information, and optimizing the performance index of the cooling system.
Specifically, the cooling system information is sent to the casape controller; under the cooling requirements of a driving motor and a power battery, the duty ratio of a water pump, the duty ratio of a fan and the opening degree of a water valve are regulated by the CANape controller, so that the energy consumption of the whole vehicle is reduced.
Preferably, the environment bin simulation test simulates a test environment through the environment bin, and collects cooling system information under the vehicle working condition corresponding to the test environment, and further comprises:
the environment bin simulation test is to confirm that the electric quantity of the vehicle power battery is not less than the test standard electric quantity, and place the test vehicle in a laboratory of the environment simulation bin and fix the test vehicle on the chassis dynamometer, wherein the test standard electric quantity is the minimum electric quantity meeting the test requirement;
the test environment comprises a temperature environment, and after the temperature environment of a laboratory reaches a preset temperature range, the vehicle immersion time is not lower than the preset time, wherein the temperature environment comprises a high temperature environment, a normal temperature environment and a low temperature environment;
when the air conditioner is in a high-temperature environment, adjusting the air quantity of the air conditioner system to be the maximum value, adjusting the temperature to be the minimum value, and collecting information of a cooling system;
and in the low-temperature environment, adjusting the air quantity of the air conditioning system to be the maximum value, adjusting the temperature to be the maximum value, and collecting the information of the cooling system.
In the above examples, the environmental conditions of the environmental chamber simulation test are shown in table 3:
TABLE 3 environmental conditions
Preferably, the environment bin simulation test simulates a test environment through the environment bin, and collects cooling system information under the vehicle working condition corresponding to the test environment, and further comprises:
the vehicle working conditions corresponding to the environment of the environment bin simulation test comprise constant speed test, idle speed test, dynamic vehicle speed test, constant speed climbing test, CLTC (closed loop control) cycle test and DC (direct current) quick charge test, wherein the environment bin simulation test is based on environment bin conditions and simulates steady-state working conditions of a cooling system.
In this example, the experimental conditions in the environmental chamber simulation test are shown in table 4:
table 4 environmental chamber simulation test vehicle condition table
Preferably, the road test includes a summer road test and a winter road test, and collects cooling system information under corresponding vehicle conditions of the summer road and the winter road, and further includes:
the corresponding vehicle working conditions of the road test in summer comprise urban working condition tests, high-speed working condition tests, dynamic vehicle speed tests, suburban working condition tests, idle working condition tests and DC quick charging tests, and the corresponding vehicle working conditions of the road test in winter comprise urban working condition tests and DC quick charging tests, wherein the road test is set based on the working condition conditions used by users.
In the above embodiment, the test conditions in the road test are shown in table 5:
table 5 road test condition table
Preferably, as shown in fig. 3, the method comprises the following steps:
s10, arranging cooling system information received by a CANape controller;
s20, judging whether the performance index of the cooling system meets the design requirement;
and S30, if the design requirement is not met, the rotation speed of the water pump and the fan and the opening degree of the water valve are increased through the CANape controller, and the performance of the cooling system is improved until the requirement is met.
S40, if the design requirement is met, judging whether the performance index of the cooling system is excessive;
s50, if the performance index of the current cooling system is not excessive, confirming that the performance index of the current cooling system is a preferable value of cooling system calibration;
and S60, if the quantity of the water is excessive, the rotation speed of the water pump and the fan is reduced through the CANape controller, the opening degree of the water valve is reduced, and the energy consumption of the whole vehicle is reduced through adjusting the performance index of the cooling system.
In the embodiment, the method can reduce the energy consumption of the whole vehicle to the minimum and improve the cruising ability of the vehicle on the premise of meeting the cooling requirements of the driving motor and the power battery.
Preferably, determining whether the performance index of the cooling system meets the design requirement further includes:
according to the formula q=c Cooling liquid m(T Required water temperature -T Actual water temperature ) Calculating whether cooling requirements of the power battery and the driving motor are satisfied, wherein C Cooling liquid And m is the mass of the cooling liquid.
In the above embodiment, the formula q=c may be specifically used Cooling liquid m(T Required water temperature -T Actual water temperature ) And calculating whether the cooling requirement of the power battery and the driving motor is met. Wherein C is Cooling liquid And m is the mass of the cooling liquid. Said m and T Actual water temperature Can be measured by a flow sensor and a temperature sensor of the corresponding loop.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The method for calibrating the cooling system of the pure electric vehicle is characterized by comprising the following steps of:
setting the design requirement of a cooling system, and adjusting the cooling system to be tested of the pure electric vehicle to ensure that the performance index of the cooling system meets the design requirement;
confirming cooling system information to be acquired in a calibration test according to performance indexes to be calibrated of the cooling system;
constructing a calibration test of the cooling system, setting a test environment and a vehicle working condition, and collecting cooling system information in the test environment and the vehicle working condition;
and (3) processing the cooling system information, calibrating the cooling system according to the processed cooling system information, and optimizing the performance index of the cooling system.
2. The method for calibrating a cooling system of a pure electric vehicle according to claim 1, wherein the method for calibrating the cooling system of the pure electric vehicle is characterized by setting design requirements of the cooling system, adjusting the cooling system to be tested of the pure electric vehicle to enable parameters of performance indexes of the cooling system to meet the design requirements, and further comprising:
and detecting performance indexes of the cooling system in the static state, the dynamic state and the NVH performance of the pure electric vehicle and in the whole vehicle state, so that the cooling system meets the design requirements of the cooling system.
3. The method for calibrating a cooling system of a pure electric vehicle according to claim 1, wherein a calibration test of the cooling system is constructed, a test environment and a vehicle working condition are set, and cooling system information is collected in the test environment and the vehicle working condition, further comprising:
the environment bin simulation test is carried out, the test environment is simulated through the environment bin, and the cooling system information is collected under the vehicle working condition corresponding to the test environment;
road tests, including summer road tests and winter road tests, and collecting cooling system information under the corresponding vehicle working conditions of summer roads and winter roads.
4. The method for calibrating a cooling system of a pure electric vehicle according to claim 3, wherein the environmental chamber simulation test is performed by simulating a test environment through the environmental chamber, and the cooling system information is collected under the vehicle working condition corresponding to the test environment, and further comprising:
the environment bin simulation test is to confirm that the electric quantity of the vehicle power battery is not less than the test standard electric quantity, and place the test vehicle in a laboratory of the environment simulation bin and fix the test vehicle on the chassis dynamometer, wherein the test standard electric quantity is the minimum electric quantity meeting the test requirement;
the test environment comprises a temperature environment, and after the temperature environment of a laboratory reaches a preset temperature range, the vehicle immersion time is not lower than the preset time, wherein the temperature environment comprises a high temperature environment, a normal temperature environment and a low temperature environment;
when the air conditioner is in a high-temperature environment, adjusting the air quantity of the air conditioner system to be the maximum value, adjusting the temperature to be the minimum value, and collecting information of a cooling system;
and in the low-temperature environment, adjusting the air quantity of the air conditioning system to be the maximum value, adjusting the temperature to be the maximum value, and collecting the information of the cooling system.
5. The method for calibrating a cooling system of a pure electric vehicle according to claim 3, wherein the environmental chamber simulation test is performed by simulating a test environment through the environmental chamber, and the cooling system information is collected under the vehicle working condition corresponding to the test environment, and further comprising:
the vehicle working conditions corresponding to the environment of the environment bin simulation test comprise constant speed test, idle speed test, dynamic vehicle speed test, constant speed climbing test, CLTC (closed loop control) cycle test and DC (direct current) quick charge test, wherein the environment bin simulation test is based on environment bin conditions and simulates steady-state working conditions of a cooling system.
6. A method of calibrating a cooling system of a blade electric vehicle according to claim 3, wherein the road test includes a summer road test and a winter road test, and the method further includes collecting cooling system information under vehicle conditions corresponding to the summer road and the winter road:
the corresponding vehicle working conditions of the road test in summer comprise urban working condition tests, high-speed working condition tests, dynamic vehicle speed tests, suburban working condition tests, idle working condition tests and DC quick charging tests, and the corresponding vehicle working conditions of the road test in winter comprise urban working condition tests and DC quick charging tests, wherein the road test is set based on the working condition conditions used by users.
7. The method for calibrating a cooling system of a pure electric vehicle according to claim 1, wherein the cooling system information is processed, and the cooling system is calibrated according to the processed cooling system information, so as to optimize performance indexes of the cooling system, and further comprising:
transmitting cooling system information to the casape controller;
under the cooling requirements of a driving motor and a power battery, the duty ratio of a water pump, the duty ratio of a fan and the opening degree of a water valve are regulated by the CANape controller, so that the energy consumption of the whole vehicle is reduced.
8. The method for calibrating a cooling system of a pure electric vehicle according to claim 7, comprising:
arranging cooling system information received by the CANape controller;
judging whether the performance index of the cooling system meets the design requirement;
if the design requirement is not met, the rotation speed of the water pump and the fan and the opening degree of the water valve are increased through the CANape controller, and the performance of the cooling system is improved until the requirement is met.
9. The method for calibrating a cooling system of a pure electric vehicle according to claim 8, wherein determining whether the performance index of the cooling system meets the design requirement further comprises:
if the design requirement is met, judging whether the performance index of the cooling system is excessive;
if the cooling system is not excessive, confirming that the performance index of the current cooling system is a preferable value of the cooling system calibration;
if the water is excessive, the rotation speed of the water pump and the fan is reduced through the CANape controller, the opening of the water valve is reduced, and the energy consumption of the whole vehicle is reduced through adjusting the performance index of the cooling system.
10. The method for calibrating a cooling system of a pure electric vehicle according to claim 7, wherein determining whether the performance index of the cooling system meets the design requirement further comprises:
according to the formula q=c Cooling liquid m(T Required water temperature -T Actual water temperature ) And calculating whether the cooling requirement of the power battery and the driving motor is met. Wherein C is Cooling liquid And m is the mass of the cooling liquid.
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