CN113147505A - Power supplementing system and method for low-voltage battery after electric vehicle dormancy - Google Patents
Power supplementing system and method for low-voltage battery after electric vehicle dormancy Download PDFInfo
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- CN113147505A CN113147505A CN202110228084.4A CN202110228084A CN113147505A CN 113147505 A CN113147505 A CN 113147505A CN 202110228084 A CN202110228084 A CN 202110228084A CN 113147505 A CN113147505 A CN 113147505A
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- 230000001502 supplementing effect Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000005059 dormancy Effects 0.000 title claims description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 35
- 239000013589 supplement Substances 0.000 claims abstract description 31
- 239000000725 suspension Substances 0.000 claims abstract description 21
- 230000005611 electricity Effects 0.000 claims abstract description 18
- 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 claims abstract 22
- 230000007958 sleep Effects 0.000 claims description 7
- 230000002618 waking effect Effects 0.000 claims description 2
- 238000007726 management method Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 3
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- 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]
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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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Abstract
The invention relates to a system and a method for supplementing a low-voltage battery after an electric vehicle is dormant, which comprises a power supplementing condition editing module, a power supplementing module and a power supplementing module, wherein the power supplementing condition editing module is used for editing a basic condition that the low-voltage battery enters power supplementing and a stopping condition that the low-voltage battery exits power supplementing during charging; the monitoring module is used for monitoring state information data of the power supply system; the judging module is used for judging whether the state information data of the electricity supplementing system obtained by the detecting module before the low-voltage battery is charged meets the basic condition or not and judging whether the state information data of the electricity supplementing system obtained by the monitoring module when the low-voltage battery is charged meets the suspension condition or not; and the control module is used for adjusting the charging of the DCDC to the low-voltage battery according to the result of the judging module. The invention timely supplements the power to the low-voltage battery in the electric vehicle in the dormant state, thereby avoiding the problem that the vehicle cannot be started due to the feeding of the low-voltage battery caused by long-time parking of the vehicle.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a system and a method for supplementing a low-voltage battery after an electric vehicle is dormant.
Background
With the development of pure electric vehicles, more and more electronic devices are mounted on the pure electric vehicles. The proliferation of electronics further increases the chances of low voltage battery feed. In a low-voltage system of a new energy electric automobile, a DCDC (direct current-direct current converter) is used for converting high voltage of a power battery into low voltage to charge a low-voltage battery (such as a 12V low-voltage battery) and supply power to a low-voltage system of the whole automobile.
For example, chinese patent publication No. CN201810547140.9 discloses a vehicle low-voltage battery management method and system, which is used for energy management of a low-voltage battery of a vehicle; the method comprises the following steps: collecting battery state information of the low-voltage battery in real time; and controlling whether to wake up the DCDC of the vehicle to charge the low-voltage battery and/or supply power to the whole vehicle according to the battery state information.
However, the battery management systems in the prior art; generally, the low-voltage battery is charged when the automobile runs, and the electricity consumption caused by the static power consumption of the low-voltage battery when the automobile is parked for a long time is not considered; causing the feeding of the low-voltage battery and thus affecting the starting of the vehicle.
Disclosure of Invention
In view of the above problems in the prior art, the present invention is directed to a system and method for recharging a low-voltage battery after an electric vehicle is dormant; when avoiding the long-term dormancy of vehicle, the low-voltage battery takes place the feed and can not start the condition of vehicle, guarantees the flexibility of mending the electricity and realizes intelligent mend the electricity.
The technical purpose of the invention is realized by the following technical scheme: an electric vehicle power supplementing system for a low-voltage battery after sleeping, comprising:
the low-voltage battery charging system comprises a charging condition editing module, a charging condition editing module and a charging condition editing module, wherein the charging condition editing module is used for editing basic conditions for entering charging of the low-voltage battery and stopping conditions for exiting charging of the low-voltage battery during charging; the basic condition comprises that the voltage value of the low-voltage battery is lower than a preset first threshold value before the low-voltage battery is charged; the suspension condition comprises that the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold value when the low-voltage battery is charged;
the system comprises a wake-up module, a control module and a control module, wherein the wake-up module is preset with cycle time C for periodically waking up a whole vehicle network;
the monitoring module is used for monitoring the current value flowing into the low-voltage battery when the low-voltage battery is charged and monitoring the voltage value of the low-voltage battery before the low-voltage battery is charged after a vehicle is awakened;
the judging module is used for judging whether the voltage value obtained by the monitoring module before the low-voltage battery is charged meets the basic condition or not and judging whether the current value obtained by the monitoring module when the low-voltage battery is charged meets the suspension condition or not;
the control module adjusts the charging of the DCDC to the low-voltage battery according to the judgment module result; when the voltage value of the low-voltage battery monitored by the monitoring module before the low-voltage battery is charged meets the basic condition, the control module controls the DCDC to charge the low-voltage battery; and when the current value flowing into the low-voltage battery monitored by the monitoring module in the charging process of the low-voltage battery meets the suspension condition, the control module controls the DCDC to stop charging the low-voltage battery.
Therefore, intelligent and safe electricity supplement is realized for preventing the long-time parking of the vehicle from causing the feeding of the low-voltage battery. This scheme provides a low-voltage battery's benefit electric system behind electric motor car dormancy, and this benefit electric system includes benefit electric condition editing module, awakens up module, monitoring module, judging module and control module. The power supply condition editing module is used for editing the basic condition that the low-voltage battery enters power supply and the stopping condition that the low-voltage battery exits power supply during power supply in a self-defined manner in advance; the basic condition is that the voltage value of the low-voltage battery is smaller than the preset first threshold value before the low-voltage battery is charged; the suspension condition is that the absolute value of the current flowing into the low-voltage battery is smaller than the second threshold value when the low-voltage battery is charged. When the vehicle is in a dormant state, the awakening module awakens the whole vehicle network once every preset cycle time C. After the whole vehicle network is awakened, the monitoring module monitors the voltage value of the low-voltage battery; the judging module judges whether the voltage value of the low-voltage battery obtained by the monitoring module meets the basic condition or not, and when the obtained voltage value meets the basic condition; namely: before the low-voltage battery is charged, the voltage value of the low-voltage battery is lower than the first threshold value, the control module controls the DCDC to charge the low-voltage battery, the DCDC is connected with the high-voltage battery, and the DCDC converts high voltage electricity in the high-voltage battery into low voltage electricity to supply power for the low-voltage battery. In the charging process, the monitoring module monitors the current value flowing into the low-voltage battery in real time; the judging module judges whether the absolute value of the current flowing into the low-voltage battery monitored by the monitoring module meets the stopping condition or not, and when the obtained current value meets the stopping condition; namely: when the low-voltage battery is charged, the absolute value of the current flowing into the low-voltage battery is smaller than the second threshold value, and the control module controls the DCDC to stop supplying power to the low-voltage battery.
Preferably, in the charging of the low-voltage battery, the DCDC stops charging the low-voltage battery after an absolute value of a current flowing into the low-voltage battery is smaller than a preset second threshold and the phenomenon continues for a preset time T1.
Therefore, the preset time T1 is edited by the power supply condition editing module, and when the low-voltage battery is charged, the monitoring module monitors that the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold and the phenomenon lasts for the preset time T1; the DCDC stops charging the low-voltage battery. And misjudgment caused by instability of data is avoided.
Preferably, the DCDC is connected to a high-voltage battery, and when the monitoring module monitors that the SOC value of the high-voltage battery is greater than a preset third threshold, the control module allows the DCDC to charge the low-voltage battery.
Thereby, the DCDC converts the high voltage of the high voltage battery into a low voltage to power the low voltage battery; the power supply condition editing module edits the third threshold, and when the monitoring module monitors that the residual electric quantity of the high-voltage battery is larger than the preset third threshold; the control module allows the DCDC to charge the low voltage battery.
Preferably, when the accumulated power supplementing time of the low-voltage battery is greater than a preset time threshold T2, the DCDC stops charging the low-voltage battery; when the voltage of the high-voltage battery is less than the first threshold, the DCDC stops charging the low-voltage battery.
Therefore, safety and intellectualization of charging are ensured. The power supply condition editing module presets a time threshold T2, and when the DCDC charges the low-voltage battery; when the monitoring module monitors that the accumulated power supplementing time of the low-voltage battery is larger than a preset time threshold T2, the control module controls the DCDC to stop charging for the low voltage. The DCDC enters power supplement to stop power supplement in a cycle, and the accumulated time is the superposition of the power supplement time of each cycle. Likewise, when the monitoring module monitors that the voltage of the high-voltage battery is smaller than the first threshold, the DCDC stops charging the low voltage.
The invention also relates to a method for supplementing the low-voltage battery after the electric vehicle is dormant, which implements the system for supplementing electricity as defined above, and comprises the following steps:
s01, self-defining the power supply condition,
editing and inputting a basic condition for the low-voltage battery to enter power supplement, wherein the basic condition is that the voltage value of the low-voltage battery is lower than a preset first threshold value before the low-voltage battery is charged;
s02, a network awakening step,
the vehicle-mounted network terminal awakens the whole vehicle network every cycle time C;
s03, a step of data acquisition,
after the whole vehicle network is awakened, the battery management system collects the voltage value of the low-voltage battery and uploads the voltage value to the whole vehicle controller;
s04, a step of judging the power supply condition,
judging whether the voltage value of the low-voltage battery acquired by the battery management system meets the basic condition or not;
s05, a low-voltage battery power supply step,
and charging the low-voltage battery according to the judgment result in the step S04, and when the voltage value of the low-voltage battery obtained by the vehicle control unit meets the basic condition, controlling the DCDC to supplement power for the low-voltage battery by the vehicle control unit.
Therefore, the invention implements the method for supplementing the low-voltage battery after the electric vehicle of the electricity supplementing system is dormant, so as to safely supplement the electricity for the electric vehicle in the dormancy and ensure the flexibility of supplementing the electricity. The method comprises the following steps: the method comprises the following steps: the basic conditions for the low-voltage battery to enter power supplement are input through the vehicle control unit in a self-defined editing mode, wherein the basic conditions comprise that the voltage value of the low-voltage battery is lower than the first threshold value before the low-voltage battery is charged. Step two: and the vehicle-mounted network terminal automatically awakens the whole vehicle network every cycle time C network, wherein the whole vehicle network comprises a whole vehicle controller, a battery management system, a DCDC (direct current DC) and the like. Step three: and after the whole vehicle network is awakened, the battery management system collects the voltage value of the low-voltage battery and uploads the voltage value to the whole vehicle controller. Step four: and the vehicle control unit judges the magnitude relation between the obtained voltage value of the low-voltage battery and the first threshold value. Step five: before the low-voltage battery is charged, when the voltage value of the low-voltage battery collected by the battery management system is lower than the first threshold value; and the vehicle control unit controls the DCDC to charge the low-voltage battery.
Preferably, the vehicle control unit may further edit a stop condition for stopping charging of the DCDC when the DCDC is input to replenish the low-voltage battery; the suspension condition is that the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold value when the low-voltage battery is charged.
Therefore, intelligent power supply is realized for increasing the flexibility of power supply. The finished vehicle controller edits a suspension condition for stopping power supplement when the DCDC is input to supplement power to the low-voltage battery; and when the battery management system acquires that the absolute value of the current flowing into the low-voltage battery is smaller than the preset second threshold, the DCDC stops supplementing the power to the low-voltage battery.
Preferably, when the low-voltage battery is charged, the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold value, and the phenomenon lasts for a preset time T1; the DCDC stops charging the low-voltage battery.
Therefore, misjudgment caused by instability of data is avoided. When the low-voltage battery is charged, the absolute value of the current flowing into the low-voltage battery, which is obtained by the vehicle control unit, is smaller than a preset second threshold value, and after the phenomenon lasts for a preset time T1, the vehicle control unit controls the DCDC to stop supplying power to the low-voltage battery.
Preferably, the method further includes, after the step S05, attempting to enter a power supply step: the waiting time T3 is preset by the vehicle control unit, and after the DCDC stops supplying power; the vehicle control unit judges whether the obtained voltage value of the low-voltage battery meets the basic condition, and when the obtained current voltage value of the low-voltage battery meets the basic condition, the waiting time T3 is passed; the whole vehicle controller controls the DCDC to charge the low-voltage battery; and when the obtained current voltage value of the low-voltage battery does not meet the basic condition, the vehicle enters the sleep mode.
Therefore, the power supplementing effect of the power supplementing system is ensured. And after the vehicle control unit controls the DCDC4 to stop supplying power for the low-voltage battery, the vehicle control unit judges whether the obtained current voltage value of the low-voltage battery meets the basic condition again. When the voltage value of the low-voltage battery meets the basic condition, the contingency and the accuracy of the monitored data are eliminated; after the waiting time T3, the vehicle control unit controls the DCDC to charge the low-voltage battery again; when the voltage value of the current low-voltage battery does not meet the basic condition, the vehicle enters a dormant state; completing one charging cycle.
Preferably, the vehicle control unit is provided with a controller for limiting the number of times of the low-voltage battery entering power supplement in one awakening cycle.
Therefore, the low-voltage battery is prevented from entering intelligent power supply frequently. The whole vehicle controller is provided with a controller for limiting the number of times of entering power supplement in one awakening cycle, and when the number of times of trying entering power supplement of the low-voltage battery in one awakening cycle is larger than the set number of times of trying; even if the current low-voltage battery state information data satisfies the basic condition; the DCDC does not charge the low voltage battery.
In conclusion, the invention has the following beneficial effects:
1. the invention supplies power to the low-voltage battery in the electric vehicle in the dormant state at the right moment, thereby avoiding the problem that the vehicle cannot be started due to the feeding of the low-voltage battery caused by long-time parking;
2. the method comprises the following steps of setting basic conditions for entering power compensation and stopping conditions for exiting power compensation for entering and exiting power compensation of a low-voltage battery; the safety and the flexibility of power supply are guaranteed;
3. according to the invention, the whole vehicle network is awakened through the vehicle-mounted network terminal network to automatically supplement the power to the low-voltage battery, so that the automation and the intellectualization of power supplement are improved;
4. after the vehicle exits the power supplement, the vehicle controller tries to enter the power supplement process again; the power supply quality and the power supply effect are improved.
Description of the drawings:
FIG. 1 is a schematic diagram of a system configuration according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating steps in a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for charging a 12V low-voltage battery according to a second embodiment of the present invention.
In the figure:
1. the system comprises a vehicle-mounted network terminal 2, a vehicle control unit 3, a battery management system 4, a DCDC 5 and a 12V low-voltage battery.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
In the first embodiment, as shown in fig. 1, in order to prevent the vehicle from being parked for a long time and causing the feeding of the low-voltage battery, the intelligent and safe power supplement is realized. The embodiment provides a system for supplementing power to a low-voltage battery after an electric vehicle is dormant, which comprises: the power supply device comprises a power supply condition editing module, a wake-up module, a monitoring module, a judgment module and a control module; the power supply condition editing module is used for customizing and editing basic conditions for entering power supply of the low-voltage battery and stopping conditions for stopping power supply of the low-voltage battery during power supply in advance; the basic conditions comprise that before the low-voltage battery is charged, the voltage value of the low-voltage battery is smaller than a preset first threshold value; the suspension condition includes that the absolute value of the current flowing into the low-voltage battery is smaller than the second threshold value and this phenomenon continues for a preset time T1 while the low-voltage battery is charged. When the vehicle is in a dormant state, the awakening module awakens the whole vehicle network once every preset cycle time C. After the whole vehicle network is awakened, the monitoring module monitors the voltage value of the low-voltage battery; the judgment module judges whether the voltage value of the low-voltage battery obtained by the monitoring module meets the basic condition or not, and when the obtained voltage value meets the basic condition; namely: before the low-voltage battery is charged, the voltage value of the low-voltage battery is lower than a first threshold value, the control module controls the DCDC4 to charge the low-voltage battery, the DCDC is connected with the high-voltage battery, and the DCDC converts high voltage electricity in the high-voltage battery into low voltage electricity to supply power for the low-voltage battery. In the charging process, the monitoring module monitors the current value flowing into the low-voltage battery in real time; the judgment module judges whether the absolute value of the current flowing into the low-voltage battery monitored by the monitoring module meets the suspension condition or not, and when the obtained current value meets the suspension condition; namely: when the low-voltage battery is charged, the absolute value of the current flowing into the low-voltage battery is smaller than the second threshold value, the phenomenon lasts for the preset time T1, and the control module controls the DCDC4 to stop supplying power to the low-voltage battery.
The power supply condition editing module is used for editing basic conditions for entering power supply of the low-voltage battery and stopping conditions for stopping power supply of the low-voltage battery during power supply. The basic conditions and the stopping conditions are user-defined editing input, and the basic conditions for the low-voltage battery to enter the power supplement also meet all the following basic conditions edited and input by the power supplement condition editing module except that the voltage value of the low-voltage battery is smaller than a preset first threshold before the low-voltage battery is charged: condition 1: the awakening mode is network awakening without other awakening sources; condition 2: the voltage data of the low-voltage battery obtained by monitoring is accurate; the accuracy of the voltage data of the low-voltage battery acquired by the power supply system is judged by the aid of other judging systems, so that the vehicle control unit 2 obtains relatively accurate voltage data to perform power supply judgment. Condition 3: the SOC value of the high-voltage battery is greater than a preset third threshold value; and when the residual capacity of the high-voltage battery is larger than a preset third threshold value, the low-voltage battery can be supplied with power. Condition 4: the high-voltage battery has no fault, and the DCDC4 has no fault during operation; the high-voltage battery provides electric energy for the low-voltage battery, and the fault of forbidden operation does not occur; the DCDC4 converts the high voltage in the high voltage battery into low voltage to charge the low voltage battery, and no operation prohibition fault occurs. Condition 5: after the whole vehicle network is awakened, power supply is started after the delay time t. The delay time t represents that the system is stable after the whole vehicle network is awakened; thereby enabling stable and reliable voltage data to be acquired. The delay time t is a default value which is measured through a plurality of tests and input into the vehicle control unit 2 when the power supply system is developed.
Similarly, when the low-voltage battery meets the above-mentioned suspension condition, DCDC4 stops charging the low-voltage battery; in addition, when the low-voltage battery is charged, the low-voltage battery meets any one of the following suspension conditions input by the power supply condition editing module, and the DCDC4 stops charging the low-voltage battery: condition 6: the accumulated power supplementing time of the low-voltage battery is greater than a preset time threshold T2; the DCDC4 enters the power supply to exit the power supply for a cycle, and the accumulated time is the superposition of the power supply time of each cycle. Condition 7: enter other wake-up sources. Condition 8: the SOC of the high-voltage battery is smaller than a preset first threshold value; that is, when the remaining capacity of the high-voltage battery is less than the first threshold, the low-voltage battery is not sufficiently supplied with electric energy. Condition 9: the current data flowing into the low-voltage battery is inaccurate; when the current data flowing into the low-voltage battery is inaccurate, the charging state of the low-voltage battery is monitored inaccurately; it is impossible to judge whether or not charging is completed. Condition 10: DCDC4 changes from the "normal on" state to the other state; when the DCDC4 is not in the "normal operation" state, it is unable to convert the high voltage of the high voltage battery into low voltage to supply power to the low voltage battery. Condition 11: the high voltage at the outer end of the high-voltage battery is changed from 'built' to 'non-built'; when no high voltage is built up at the outer end of the high voltage battery pack, the DCDC4 cannot convert the high voltage. Condition 12: the high voltage at the outer end of the high-voltage battery is established overtime; when the high voltage build-up of the outer end of the high voltage battery is over time, the high voltage build-up of the high voltage battery fails.
The judgment module judges the basic condition and the termination condition by the monitoring module and other auxiliary judgment modules together, which is a technical content in the field and is not limited herein.
According to the electricity supplementing system defined above, the present embodiment provides an electricity supplementing method for a low-voltage battery after an electric vehicle is dormant, which includes the following steps:
the method comprises the following steps: the basic conditions for inputting the low-voltage battery into the power supply system are edited in a user-defined mode through the vehicle control unit 2, the basic conditions are the same as the basic conditions preset by the power supply system, and the basic conditions are not repeated;
step two: the vehicle-mounted network terminal 1 automatically wakes up the whole vehicle network at intervals of the cycle time C, and the whole vehicle network comprises a whole vehicle controller 2, a battery management system 3, DCDC4 and the like.
Step three: after the whole vehicle network is awakened, the battery management system 3 collects the piezoelectric battery state information data, the high-voltage battery state information data and the DCDC4 state information data and uploads the data to the whole vehicle controller 2;
step four: after the vehicle network is awakened, the vehicle control unit 2 judges whether the obtained low-voltage battery state information data, the high-voltage battery state information data and the DCDC4 state information data meet all preset basic conditions before the low-voltage battery is charged;
step five: when the low-voltage battery state information data, the high-voltage battery state information data and the DCDC4 state information data obtained before the low-voltage battery is charged meet all preset basic conditions, the vehicle control unit 2 controls the DCDC4 to charge the low-voltage battery;
in order to increase the flexibility of power supply, intelligent power supply is realized. When the input DCDC4 is edited by the vehicle control unit 2 to supplement power to the low-voltage battery, stopping supplementing power; the stopping conditions are the same as the stopping conditions preset by the power supply system, and are not repeated; when the low-voltage battery state information data, the high-voltage battery state information data and the DCDC4 state information data obtained when the low-voltage battery is charged satisfy any preset suspension condition, the DCDC4 stops supplementing power to the low-voltage battery.
After the vehicle control unit 2 controls the DCDC4 to stop supplying power for the low-voltage battery, the vehicle control unit 2 judges whether the obtained current state information data of the power supply system meets all basic conditions again; when the state information data of the power supply system meets all basic conditions, waiting time T3 is passed; the whole vehicle controller 2 controls the DCDC4 to charge the low-voltage battery again; when any basic condition is not met, the vehicle enters a dormant state; completing one charging cycle. The intelligent power supply is realized in order to prevent the low-voltage battery from frequently entering the intelligent power supply in one charging cycle. The vehicle control unit 2 is provided with a control unit for limiting the number of attempts to enter power supplement in one awakening cycle; when the number of attempts for entering power supplement in one awakening cycle is larger than the set number of attempts, the current state information data of the charging system meets all basic conditions; DCDC4 does not charge the low voltage battery.
In the second embodiment, as shown in fig. 3, a schematic diagram of a power supply system for supplying power to the 12V low-voltage battery 5 of the electric vehicle includes a vehicle-mounted network terminal 1, a vehicle control unit 2, a battery management system 3, DCDC4, and the 12V low-voltage battery 5. The vehicle control unit 2 stores basic conditions for charging the 12V low-voltage battery 5, which are edited and input in advance by a user. The basic condition for inputting the 12V low-voltage battery into the power supplementing mode through editing by the user is that the voltage value acquired before the 12V low-voltage battery 5 is charged is smaller than 11V. The vehicle-mounted network terminal 1 wakes up the whole vehicle network every 4 hours, and the whole vehicle network comprises a whole vehicle controller 2, a battery management system 3, DCDC4 and the like. After the whole vehicle network is awakened, the battery management system 3 collects the voltage value of the 12V low-voltage battery 5 and feeds the voltage value back to the whole vehicle controller 2; after the vehicle control unit 2 is initialized, whether the obtained voltage value of the 12V low-voltage battery 5 before charging meets a preset basic condition is judged; when the voltage value of the 12V low-voltage battery 5 obtained by the vehicle control unit 2 before charging meets the basic condition, the vehicle control unit 2 sends a 'closed discharge loop instruction' to the battery management system 3. The battery management system 3 establishes the external high voltage of the external end of the high-voltage battery, and after the high voltage is established; the vehicle control unit 2 simultaneously transmits a "state request", a "voltage request", and a "power request" command to the DCDC4, and operates the DCDC4 to charge the 12V low-voltage battery 5. The vehicle control unit 2 also edits and inputs a suspension condition that the DCDC4 stops charging the low-voltage battery. The suspension condition is that during the low-voltage battery recharging process, the absolute value of the current flowing into the 12V low-voltage battery 5 is smaller than the second threshold value, the phenomenon lasts for 5 seconds, and the DCDC4 stops recharging the low-voltage battery. In the power supplementing process, the vehicle control unit 2 monitors the 12V low-voltage battery 5 in real time. And judging whether the current value flowing into the 12V low-voltage battery 5 meets a preset stopping condition or not, and stopping supplying power to the 12V low-voltage battery 5 by the DCDC4 when the current value flowing into the 12V low-voltage battery 5 obtained by the vehicle control unit 2 meets the stopping condition. When the power supply is stopped, the vehicle control unit 2 judges whether the voltage value of the 12V low-voltage battery 5 obtained currently meets the basic condition again; if the basic condition is met, after the waiting time is 10s, the waiting time can be adjusted in real time; the next attempt to enter power-up may be made. Otherwise, the vehicle enters a dormant state. In order to avoid the situation that the low-voltage battery frequently enters intelligent power supplement for a long time, the whole vehicle controller 2 sets the total number of times of trying to enter power supplement in the wake-up cycle not to be more than 5, and the number of times can be adjusted in real vehicles.
The basic conditions and the stopping conditions are user-defined editing input, and when the vehicle control unit 2 judges that the current state information data of the power supply system meets all the basic conditions of the editing input; DCDC4 is controlled to charge the low voltage battery. And when the vehicle control unit 2 judges that the obtained current state information data of the power supply system meets any one of the edit input stop conditions, controlling the DCDC4 to quit power supply for the low-voltage battery. The basic conditions for the low-voltage battery to enter the power supplement mode are that the voltage value of the low-voltage battery is smaller than the preset 11V before the low-voltage battery is charged, and the following basic conditions edited and input by the vehicle control unit 2 are also met:
condition 1: the awakening mode is network awakening without other awakening sources;
condition 2: the acquired voltage data of the 12V low-voltage battery 5 is accurate;
condition 3: the SOC value of the high-voltage battery is more than 15%;
condition 4: the high voltage battery, DCDC4 is not faulty;
condition 5: after the whole vehicle network is awakened, power supply is started after the time t is prolonged.
Likewise, in addition to the above, when the absolute value of the current flowing into the 12V low-voltage battery 5 is less than the preset second threshold value and this phenomenon lasts for 5 seconds at the time of battery charging; DCDC4 stops replenishing the low voltage battery. When the low-voltage battery is charged, the power supply system meets any one of the following suspension conditions edited and input by the vehicle control unit 2, and the DCDC4 stops charging the low-voltage battery:
condition 6: when the accumulated power supplementing time is greater than a preset time threshold value for 45 minutes; the accumulated power supplementing time is the superposition of each cycle of power supplementing time from power supplementing of DCDC4 to power supplementing of exit;
condition 7: a slow charge awakening source, a fast charge awakening source or a KL15 awakening source are used for awakening;
condition 8: the SOC of the high-voltage battery is less than 11V;
condition 9: the data of the current flowing into the 12V low-voltage battery 5 is inaccurate;
condition 10: DCDC4 changes from the "normal on" state to the other state;
condition 11: the high voltage at the outer end of the high-voltage battery is changed from 'built' to 'non-built';
condition 12: the high voltage at the outer end of the high voltage battery is established overtime.
The vehicle control unit 2 determines the basic condition and the suspension condition by the battery management system 3 and other auxiliary determination systems, which is a technical content in the art and is not limited herein.
Claims (9)
1. An electric vehicle power supplementing system for a low-voltage battery after dormancy, comprising:
the low-voltage battery charging system comprises a charging condition editing module, a charging condition editing module and a charging condition editing module, wherein the charging condition editing module is used for editing basic conditions for entering charging of the low-voltage battery and stopping conditions for exiting charging of the low-voltage battery during charging; the basic condition comprises that the voltage value of the low-voltage battery is lower than a preset first threshold value before the low-voltage battery is charged; the suspension condition comprises that the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold value when the low-voltage battery is charged;
the system comprises a wake-up module, a control module and a control module, wherein the wake-up module is preset with cycle time C for periodically waking up a whole vehicle network;
the monitoring module is used for monitoring the current value flowing into the low-voltage battery when the low-voltage battery is charged and monitoring the voltage value of the low-voltage battery before the low-voltage battery is charged after a vehicle is awakened;
the judging module is used for judging whether the voltage value obtained by the monitoring module before the low-voltage battery is charged meets the basic condition or not and judging whether the current value obtained by the monitoring module when the low-voltage battery is charged meets the suspension condition or not;
the control module adjusts the charging of the DCDC (4) to the low-voltage battery according to the judgment module result; when the voltage value of the low-voltage battery monitored by the monitoring module before the low-voltage battery is charged meets the basic condition, the control module controls the DCDC (4) to charge the low-voltage battery; and when the current value which is monitored by the monitoring module and flows into the low-voltage battery in the charging process of the low-voltage battery meets the suspension condition, the control module controls the DCDC (4) to stop charging the low-voltage battery.
2. The system for recharging the low-voltage battery after the electric vehicle is dormant according to claim 1, wherein when the low-voltage battery is charged, the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold value, and the phenomenon lasts for a preset time T1, and the DCDC (4) stops charging the low-voltage battery.
3. The system for supplementing the low-voltage battery after the electric vehicle sleeps according to claim 1, wherein the DCDC (4) is connected with a high-voltage battery, and when the monitoring module monitors that the SOC value of the high-voltage battery is greater than a preset third threshold value, the control module allows the DCDC (4) to charge the low-voltage battery.
4. The system for supplementing the low-voltage battery after the electric vehicle sleeps according to claim 3, wherein when the accumulated supplementing time of the low-voltage battery is greater than a preset time threshold T2, the DCDC (4) stops charging the low-voltage battery; when the voltage of the high-voltage battery is less than the first threshold, the DCDC (4) stops charging the low-voltage battery.
5. A method for supplementing electricity to a low-voltage battery after an electric vehicle is dormant, which implements an electricity supplementing system according to any one of claims 1 to 4, and is characterized by comprising the following steps:
s01, self-defining the power supply condition,
editing and inputting a basic condition for the low-voltage battery to enter power supplement, wherein the basic condition is that the voltage value of the low-voltage battery is lower than a preset first threshold value before the low-voltage battery is charged;
s02, a network awakening step,
the vehicle-mounted network terminal (1) awakens the whole vehicle network every cycle time C;
s03, a step of data acquisition,
after the whole vehicle network is awakened, the battery management system (3) collects the voltage value of the low-voltage battery and uploads the voltage value to the whole vehicle controller (2);
s04, a step of judging the power supply condition,
judging whether the voltage value of the low-voltage battery collected by the battery management system (3) meets the basic condition or not;
s05, a low-voltage battery power supply step,
and charging the low-voltage battery according to the judgment result in the step S04, and when the voltage value of the low-voltage battery obtained by the vehicle control unit (2) meets the basic condition, controlling the DCDC (4) to supplement power for the low-voltage battery by the vehicle control unit (2).
6. The method for supplementing power to the low-voltage battery after the electric vehicle sleeps according to claim 5, wherein the vehicle control unit (2) is further configured to edit an interruption condition for inputting the DCDC (4) to stop charging when the DCDC (4) supplements power to the low-voltage battery; the suspension condition is that the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold value when the low-voltage battery is charged.
7. The method for supplementing power to a low-voltage battery after an electric vehicle sleeps according to claim 6, wherein when the low-voltage battery is charged, after the absolute value of the current flowing into the low-voltage battery is smaller than a preset second threshold value and the phenomenon continues for a preset time T1, the DCDC (4) stops charging the low-voltage battery.
8. The method of claim 5, wherein after the step S05, the method further comprises attempting to enter a step of recharging: the waiting time T3 is preset by the vehicle control unit (2), and after the DCDC (4) stops power supplement; the vehicle control unit (2) judges whether the obtained voltage value of the low-voltage battery meets the basic condition, and when the obtained current voltage value of the low-voltage battery meets the basic condition, the waiting time T3 is passed; the whole vehicle controller (2) controls the DCDC (4) to charge the low-voltage battery; and when the obtained current voltage value of the low-voltage battery does not meet the basic condition, the vehicle enters the sleep mode.
9. The method for supplementing power to the low-voltage battery after the electric vehicle sleeps according to claim 8, wherein the vehicle control unit (2) is provided for limiting the number of times the low-voltage battery tries to enter the power supplementing state in one awakening cycle.
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