CN110182052A - A kind of control strategy of automobile power cell operating status - Google Patents
A kind of control strategy of automobile power cell operating status Download PDFInfo
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- CN110182052A CN110182052A CN201910300747.1A CN201910300747A CN110182052A CN 110182052 A CN110182052 A CN 110182052A CN 201910300747 A CN201910300747 A CN 201910300747A CN 110182052 A CN110182052 A CN 110182052A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of control strategies of automobile power cell operating status, including detection module, temperature detecting module, management module, obtain module, computing module, transmission module, full-vehicle control module and vehicle CAN network module, the detection module includes Voltage detector, after Voltage detector is connected for detection circuit, whether the SOC value of battery is normal, and the data after will test are transferred to management module, the temperature detecting module includes temperature inductor, the temperature inductor is used to detect the temperature generated when battery work, and the data after will test are transferred to management module, the management module is used to receive the data of detection module and temperature detecting module detection, and the data that received detection module and temperature detecting module detect are transferred to computing module, the invention can ensure that power battery is in corresponding item Under part, makes battery in normal operation mode, drop power mode and prepare to switch between drop power mode three condition.
Description
Technical field
The invention belongs to electric vehicle engineering fields, and in particular to a kind of control plan of automobile power cell operating status
Slightly.
Background technique
Electric car (BEV) refers to using vehicle power supply as power, with motor driven wheels travel, meets road traffic, peace
The vehicle of full regulation requirements.Since effect on environment is smaller with respect to orthodox car, its prospects are considered optimistic wildly, but current skill
Art is still immature, the composition of electric car include: be driven by electricity and control system, driving force transmission etc. mechanical systems, complete both
Determine the equipment etc. of task.It is driven by electricity and control system is the core of electric car, and be different from internal-combustion engines vehicle
Maximum difference.It is driven by electricity and control system is made of the speed-regulating control device etc. of drive motor, power supply and motor.Electricity
Other devices of electrical automobile are substantially identical as internal-combustion engines vehicle, and in face of the dual-pressure of energy conservation and environmental protection, auto industry is to can
Sustainable development must just greatly develop new-energy automobile.Pure electric automobile is optimal vehicle in new-energy automobile.And automobile
Different to the energy output demand of power battery because of the difference of actual condition, in addition power battery normal condition also needs work
The limitation of condition.
Currently, the control strategy of automobile power cell operating status, it cannot be guaranteed that power battery under corresponding condition, makes electricity
Pond is in normal operation mode, drop power mode and prepares to switch between drop power mode three condition, for this purpose, it is proposed that one
The control strategy of kind automobile power cell operating status.
Summary of the invention
The purpose of the present invention is to provide a kind of control strategies of automobile power cell operating status, it is ensured that power battery
Under corresponding condition, make battery in normal operation mode, drop power mode and prepare to be cut between drop power mode three condition
It changes, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides the following technical solutions a kind of control plan of automobile power cell operating status
It omits, including detection module, temperature detecting module, management module, acquisition module, computing module, transmission module, full-vehicle control module
With vehicle CAN network module；
The detection module includes Voltage detector, and after Voltage detector is connected for detection circuit, just whether the SOC value of battery
Often, and the data after will test are transferred to management module；
The temperature detecting module includes temperature inductor, and the temperature inductor is used to detect the temperature generated when battery work
Degree, and the data after will test are transferred to management module；
The management module is used to receive the data of detection module and temperature detecting module detection, and by received detection module and
The data of temperature detecting module detection are transferred to computing module；
The computing module is used to calculate the data of the detection of detection module and temperature detecting module detection, and by the number after calculating
It is compared according to power of battery MAP chart；
The data for obtaining module and being used to obtain computing module calculating, and the data that will acquire are transferred to transmission module；
The transmission module is for transferring data to full-vehicle control module；
The full-vehicle control module for current maximum continuous discharge power, crest discharge power, it is maximum continue charge power and
Peak value charge power, according to vehicle actual condition demand, full-vehicle control module can be to the work that demand power is allocated；
The vehicle CAN network module is used for when computing module detects system secondary failure, and is controlled into drop power mould
Formula；
In the case where dropping power mode, cell output and feedback power can be limited, simultaneously according to power of battery MAP by obtaining module
Request full-vehicle control module limits power, and full-vehicle control module allows maximum charge and discharge according to the battery that transmission module reports
Electrical power adjusts power distribution in real time；
In drop power mode, if the system failure is eliminated, while battery status parameter then can return to main relay in fault threshold
Device closed state operates normally, if the system failure is eliminated, but battery status parameter is more than fault threshold, then it is quasi- to enter alarm
It makes preparation for dropping power mode state；
According to the system failure and battery status parameter threshold values condition, in normal operation mode, drop power mode and prepare drop power
It is switched between three states of mode, when battery status parameter is more than fault threshold, but failure setting time does not arrive management mould
Block enters alarm and prepares drop power mode state, when failure setting time is to then into drop power mode.
Preferably, the management module is BMS system.
Preferably, the computing module is microprocessor.
Preferably, the microprocessor be Intel Core i7 processor, Intel Core i7 processor, be based on Nehalem micro-architecture, 2
Core, built-in triple channel DDR2 Memory Controller Hub, every core exclusively enjoy 8KB L2 cache, and 1-4MB shares three-level caching.
Preferably, the temperature inductor is pt100 temperature sensor, the acquisition range of pt100 temperature sensor temperature
Can be at -200 DEG C~+850 DEG C, humidity collection range is 0%~100%.
Preferably, the predetermined value that the SOC is shown is the 30%-50% of electricity.
Preferably, the Voltage detector is MS8900 alternating voltage detector, this MS8900 alternating voltage detector
Voltage sensibility is 100V-240V/AC, frequency 50/60Hz, and test environment temperature is -0-50 °, and storage temperature is -20-
60 °, weight 40g.
Preferably, the transmission module includes reception system and output system, and the reception system obtains mould for receiving
The data of block, the output system give full-vehicle control module for exporting received data.
Technical effect and advantage of the invention:
1, after the present invention is powered on by vehicle, detection module is completed normal low pressure and is powered on, and completes Backend Administration Module in self-test
The master of closed high part just with the negative relay of master, connects output end, completes high pressure and powers on, in high pressure power up, management
Module sends the current exportable parameters of battery to full-vehicle control module by vehicle CAN network module, these parameters by
Management module is searched power of battery MAP chart and is obtained according to the actual SOC value of battery and temperature, including current maximum continuous discharge
Power, crest discharge power, it is maximum continue charge power and peak value charge power, automobile during exercise, according to actual condition and
The pedal operation signal of driver, full-vehicle control module are allocated demand power, this power limit is mentioned by acquisition module
For in lasting normal operation, if management module detects system second level because of temperature, SOC, brownout and other reasons
Failure, then management module downrating, and report the failure to full-vehicle control module, battery operation state is switched to drop power
Mode, during drop power mode continues, management module limits cell output and feedback power according to power MAP, and
The limit value is sent to full-vehicle control module, requests full-vehicle control module to limit power, full-vehicle control module is according to acquisition
The battery that module reports allows maximum charge-discharge electric power to adjust power distribution in real time, guarantees that vehicle is run in the case where dropping power mode,
If the system failure is eliminated, while battery status parameter then can return to main relay closed state in fault threshold, normal to transport
Row, if the system failure is eliminated, but battery status parameter is more than fault threshold, then enters alarm and prepare drop power mode state,
According to the system failure and battery status parameter threshold values condition, in normal operation mode, drop power mode and prepare drop power mode
Switched between three states, when battery status parameter be more than fault threshold, but failure setting time do not arrive management module into
Enter alarm and prepare drop power mode state, when failure setting time is to then into drop power mode.
Detailed description of the invention
Fig. 1 is power battery operating status control process schematic diagram of the invention；
Fig. 2 is module diagram of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments, is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of control strategies of automobile power cell operating status as shown in Figs. 1-2, including detection
Module, management module, obtains module, computing module, transmission module, full-vehicle control module and vehicle CAN net at temperature detecting module
Network module；
The detection module includes Voltage detector, and after Voltage detector is connected for detection circuit, just whether the SOC value of battery
Often, and the data after will test are transferred to management module；
The temperature detecting module includes temperature inductor, and the temperature inductor is used to detect the temperature generated when battery work
Degree, and the data after will test are transferred to management module；
The management module is used to receive the data of detection module and temperature detecting module detection, and by received detection module and
The data of temperature detecting module detection are transferred to computing module；
The computing module is used to calculate the data of the detection of detection module and temperature detecting module detection, and by the number after calculating
It is compared according to power of battery MAP chart；
The data for obtaining module and being used to obtain computing module calculating, and the data that will acquire are transferred to transmission module；
The transmission module is for transferring data to full-vehicle control module；
The full-vehicle control module for current maximum continuous discharge power, crest discharge power, it is maximum continue charge power and
Peak value charge power, according to vehicle actual condition demand, full-vehicle control module can be to the work that demand power is allocated；
The vehicle CAN network module is used for when computing module detects system secondary failure, and is controlled into drop power mould
Formula；
In the case where dropping power mode, cell output and feedback power can be limited, simultaneously according to power of battery MAP by obtaining module
Request full-vehicle control module limits power, and full-vehicle control module allows maximum charge and discharge according to the battery that transmission module reports
Electrical power adjusts power distribution in real time；
In drop power mode, if the system failure is eliminated, while battery status parameter then can return to main relay in fault threshold
Device closed state operates normally, if the system failure is eliminated, but battery status parameter is more than fault threshold, then it is quasi- to enter alarm
It makes preparation for dropping power mode state；
According to the system failure and battery status parameter threshold values condition, in normal operation mode, drop power mode and prepare drop power
It is switched between three states of mode, when battery status parameter is more than fault threshold, but failure setting time does not arrive management mould
Block enters alarm and prepares drop power mode state, when failure setting time is to then into drop power mode.
Further, the management module is BMS system.
Further, the computing module is microprocessor.
Further, the microprocessor be Intel Core i7 processor, Intel Core i7 processor, be based on Nehalem micro-architecture, 2
Core, built-in triple channel DDR2 Memory Controller Hub, every core exclusively enjoy 8KB L2 cache, and 1-4MB shares three-level caching.
Further, the temperature inductor is pt100 temperature sensor, the acquisition model of pt100 temperature sensor temperature
Enclosing can be at -200 DEG C~+850 DEG C, and humidity collection range is 0%~100%.
Further, the predetermined value that the SOC is shown is the 30%-50% of electricity.
Further, the Voltage detector is MS8900 alternating voltage detector, this MS8900 alternating voltage detector
Voltage sensibility be 100V-240V/AC, frequency 50/60Hz, test environment temperature be -0-50 °, storage temperature be -20-
60 °, weight 40g.
Further, the transmission module includes reception system and output system, and the reception system is obtained for receiving
The data of module, the output system give full-vehicle control module for exporting received data.
In conclusion the control strategy of this automobile power cell operating status, after being powered on by vehicle, detection module is complete
It powers at normal low pressure, and is connected defeated in the master of self-test completion Backend Administration Module closed high part just with the negative relay of master
Outlet is completed high pressure and is powered on, and in high pressure power up, management module passes through vehicle CAN network module to full-vehicle control module
Battery currently exportable parameters are sent, these parameters, according to the actual SOC value of battery and temperature, are searched by management module
Power of battery MAP chart obtains, including current maximum continuous discharge power, crest discharge power, maximum lasting charge power and peak
It is worth charge power, during exercise, according to the pedal operation signal of actual condition and driver, full-vehicle control module is to demand for automobile
Power is allocated, this power limit is provided by acquisition module, in lasting normal operation, if management module is because of temperature
Degree, SOC, brownout and other reasons detect system secondary failure, then management module downrating, and report the failure
To full-vehicle control module, battery operation state is switched to drop power mode, drop power mode continue during, management module according to
Power MAP limits cell output and feedback power, and sends the limit value to full-vehicle control module, requests full-vehicle control mould
Block limits power, and full-vehicle control module allows maximum charge-discharge electric power to adjust in real time according to the battery that module reports is obtained
Power distribution guarantees that vehicle is run in the case where dropping power mode, if the system failure is eliminated, while battery status parameter is in fault threshold
It is interior, then it can return to main relay closed state, operate normally, if the system failure is eliminated, but battery status parameter is more than failure
Threshold values then prepares drop power mode state into alarm and is normally being transported according to the system failure and battery status parameter threshold values condition
It is switched between row mode, drop power mode and preparation drop three states of power mode, when battery status parameter is more than failure
Threshold values, but failure setting time does not arrive management module and enters alarm preparation drop power mode state, when failure setting time is to then
Into drop power mode.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. a kind of control strategy of automobile power cell operating status, including detection module, temperature detecting module, management module,
Obtain module, computing module, transmission module, full-vehicle control module and vehicle CAN network module, it is characterised in that:
The detection module includes Voltage detector, and after Voltage detector is connected for detection circuit, just whether the SOC value of battery
Often, and the data after will test are transferred to management module；
The temperature detecting module includes temperature inductor, and the temperature inductor is used to detect the temperature generated when battery work
Degree, and the data after will test are transferred to management module；
The management module is used to receive the data of detection module and temperature detecting module detection, and by received detection module and
The data of temperature detecting module detection are transferred to computing module；
The computing module is used to calculate the data of the detection of detection module and temperature detecting module detection, and by the number after calculating
It is compared according to power of battery MAP chart；
The data for obtaining module and being used to obtain computing module calculating, and the data that will acquire are transferred to transmission module；
The transmission module is for transferring data to full-vehicle control module；
The full-vehicle control module for current maximum continuous discharge power, crest discharge power, it is maximum continue charge power and
Peak value charge power, according to vehicle actual condition demand, full-vehicle control module can be to the work that demand power is allocated；
The vehicle CAN network module is used for when computing module detects system secondary failure, and is controlled into drop power mould
Formula；
In the case where dropping power mode, cell output and feedback power can be limited, simultaneously according to power of battery MAP by obtaining module
Request full-vehicle control module limits power, and full-vehicle control module allows maximum charge and discharge according to the battery that transmission module reports
Electrical power adjusts power distribution in real time；
In drop power mode, if the system failure is eliminated, while battery status parameter then can return to main relay in fault threshold
Device closed state operates normally, if the system failure is eliminated, but battery status parameter is more than fault threshold, then it is quasi- to enter alarm
It makes preparation for dropping power mode state；
According to the system failure and battery status parameter threshold values condition, in normal operation mode, drop power mode and prepare drop power
It is switched between three states of mode, when battery status parameter is more than fault threshold, but failure setting time does not arrive management mould
Block enters alarm and prepares drop power mode state, when failure setting time is to then into drop power mode.
2. a kind of control strategy of automobile power cell operating status according to claim 1, it is characterised in that: the pipe
Reason module is BMS system.
3. a kind of control strategy of automobile power cell operating status according to claim 1, it is characterised in that: the meter
Calculation module is microprocessor.
4. a kind of control strategy of automobile power cell operating status according to claim 3, it is characterised in that: described micro-
Processor is Intel Core i7 processor, and Intel Core i7 processor is based on Nehalem micro-architecture, 2 cores, in built-in triple channel DDR2
Memory controller, every core exclusively enjoy 8KB L2 cache, and 1-4MB shares three-level caching.
5. a kind of control strategy of automobile power cell operating status according to claim 1, it is characterised in that: the temperature
Degree inductor is pt100 temperature sensor, the acquisition range of pt100 temperature sensor temperature can at -200 DEG C~+850 DEG C,
Humidity collection range is 0%~100%.
6. a kind of control strategy of automobile power cell operating status according to claim 1, it is characterised in that: described
The predetermined value that SOC is shown is the 30%-50% of electricity.
7. a kind of control strategy of automobile power cell operating status according to claim 1, it is characterised in that: the electricity
Pressure detector is MS8900 alternating voltage detector, and the voltage sensibility of this MS8900 alternating voltage detector is 100V-240V/
AC, frequency 50/60Hz, test environment temperature are -0-50 °, and storage temperature is -20-60 °, weight 40g.
8. a kind of control strategy of automobile power cell operating status according to claim 1, it is characterised in that: the biography
Defeated module includes reception system and output system, and the reception system is used to receive the data for obtaining module, the output system
Full-vehicle control module is given for exporting received data.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110758178A (en) * | 2019-09-24 | 2020-02-07 | 安徽力高新能源技术有限公司 | Method for switching effective discharge power during running of new energy automobile |
| CN111890985A (en) * | 2020-06-30 | 2020-11-06 | 汉腾汽车有限公司 | Method for adjusting available power of battery of electric vehicle |
| CN112034354A (en) * | 2020-08-31 | 2020-12-04 | 蜂巢能源科技有限公司 | Battery power switching method and device, computer equipment and storage medium |
| CN113884893A (en) * | 2021-11-02 | 2022-01-04 | 蜂巢能源科技有限公司 | Power map switching method and device for power battery and electronic equipment |
| CN114859251A (en) * | 2021-01-20 | 2022-08-05 | 广汽埃安新能源汽车有限公司 | Battery charging remaining time calculation method and device and vehicle |
| CN114859251B (en) * | 2021-01-20 | 2024-06-04 | 广汽埃安新能源汽车有限公司 | Method and device for calculating battery charging remaining time and vehicle |
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