CN113085654A - Automatic power shortage prevention control method and system for low-voltage battery of electric vehicle - Google Patents
Automatic power shortage prevention control method and system for low-voltage battery of electric vehicle Download PDFInfo
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- 230000005611 electricity Effects 0.000 claims description 13
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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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 discloses an automatic control method for preventing power shortage of a low-voltage battery of an electric automobile, which comprises the steps that when the electric automobile is in a power-off state, an intelligent vehicle machine detects whether the voltage value of the low-voltage battery is lower than a first preset voltage value needing to be charged or not at regular time; if so, waking up the vehicle control unit; after receiving a charging request message sent by an intelligent vehicle machine, the vehicle control unit judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged; if yes, controlling the high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery; and monitoring and stopping waking up the whole vehicle controller when the voltage value of the low-voltage storage battery reaches a second preset voltage value and/or preset stop time for stopping charging. Therefore, the automatic charging device can realize the automatic charging function of the low-voltage storage battery and can ensure that the low-voltage storage battery cannot be lack of power or over-discharged; and because the second preset voltage value for stopping charging and the preset stopping time are set, the overcharge of the low-voltage storage battery can be effectively prevented.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to an automatic control method and system for preventing power shortage of a low-voltage battery of an electric automobile and a computer readable storage medium.
Background
Present pure electric vehicles, plug-in hybrid vehicle, new forms of energy electric vehicles such as fuel cell electric vehicle are towards intelligent development, and intelligent functional module is more, and is bigger than quiescent current (dark current) that conventional fuel vehicle exists, in the actual operation, the condition of low pressure battery insufficient voltage often appears, need the manual work to go to take the electricity for low pressure battery, and this has increased a large amount of manpowers and time cost for the operation.
Meanwhile, when the low-voltage battery is in a power shortage state, if the low-voltage battery is a lead-acid battery, the battery pole plate can be vulcanized, so that the problems of capacity attenuation and service life shortening are caused, and the operation and maintenance cost of the vehicle is increased.
The current prevention low-voltage storage battery is mainly in a mechanical structure: through increasing a manual switch on low voltage battery main circuit that discharges, when the user does not use the vehicle for a long time, this switch of manual disconnection cuts off low voltage battery's the circuit that discharges, guarantees that low voltage battery can not lack of electricity.
However, the technical scheme is realized by a mechanical structure, needs manual operation and cannot realize automation; after the discharging loop is cut off, all control modules and intelligent equipment of the whole vehicle are powered off, the state of the vehicle cannot be monitored, if accidents such as vehicle theft and collision occur, an alarm cannot be given, and certain potential safety hazards exist.
Therefore, how to automatically prevent the low-voltage storage battery from being short of the power is a problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides an automatic control method for preventing power shortage of a low-voltage battery of an electric vehicle, so as to solve the above technical problems.
Firstly, in order to achieve the above object, the present invention provides an automatic control method for preventing power shortage of a low-voltage battery of an electric vehicle, which is used for controlling an automatic control system for preventing power shortage of a low-voltage battery of an electric vehicle, wherein the automatic control system for preventing power shortage of a low-voltage battery of an electric vehicle comprises a power battery system, a dc power converter, a low-voltage battery, a vehicle control unit and an intelligent vehicle machine, and the automatic control method for preventing power shortage of a low-voltage battery of an electric vehicle comprises the following steps:
s1, when the electric automobile is in a power-off state, the intelligent vehicle machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value needing to be charged at regular time; if yes, go to step S2, otherwise, go to step S1;
s2, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit;
s3, the vehicle control unit receives the charging request message and judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged; if so, sending a message allowing charging to the intelligent vehicle machine, and executing the step S4, otherwise, sending a message not allowing charging to the intelligent vehicle machine, and executing the step S9;
s4, controlling high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery;
s8, continuously judging whether the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging, continuously timing, and judging whether the preset charging stopping time is reached; if the second preset voltage value and/or the preset stop time is reached, executing the step S9, otherwise, continuing to execute the step S8;
s9, the intelligent vehicle machine stops waking up the vehicle control unit and stops sending a message for requesting charging to the vehicle control unit;
and S10, the vehicle control unit and the intelligent vehicle machine enter a sleep state.
Optionally, after step S4, before step S8, the method further comprises the steps of:
s5, continuously judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged by the vehicle control unit in the charging process; if so, continuing charging, otherwise, sending a message that charging is not allowed to the intelligent vehicle machine, and executing step S6;
and S6, controlling the power battery system to discharge high voltage, and turning off the direct current power converter.
Optionally, after step S4, before step S8, the method further comprises the steps of:
s7, judging whether the message received by the intelligent vehicle machine is a message allowing charging; if the message is a message allowing charging, executing step S8; if the message is not allowed to be charged, step S9 is executed.
Optionally, the determining whether the vehicle state of the electric vehicle allows the low-voltage battery to be charged includes:
detecting the door state and the door lock state of the electric automobile in real time, receiving the insulation resistance state of the whole automobile from the power battery system, and judging whether the vehicle state of the electric automobile allows the low-voltage storage battery to be charged or not;
the vehicle state of the electric vehicle comprises a vehicle door state, a door lock state and a whole vehicle insulation resistance state of the electric vehicle.
Optionally, the determining whether the vehicle state of the electric vehicle allows the low-voltage battery to be charged includes:
when any one condition of opening a door of the electric automobile or unlocking the door of the electric automobile or the condition that the insulation resistance state sent by the power battery system does not allow high-voltage electricity is met, the whole automobile controller judges that the electric automobile does not allow the low-voltage storage battery to be charged;
and when all conditions that the door of the electric automobile is closed, the door is locked and the insulation resistance state sent by the power battery system allows high voltage electricity are met, the whole automobile controller judges that the electric automobile allows the low-voltage storage battery to be charged.
Optionally, before step S1, the method further comprises the steps of:
s0, detecting whether the electric automobile is in a power-off state; if so, go to step S1, otherwise, go to step S0.
Optionally, the first preset voltage value is smaller than the second preset voltage value.
Further, in order to achieve the above purpose, the invention also provides an automatic control system for preventing the power shortage of the low-voltage battery of the electric automobile, wherein the automatic control system for preventing the power shortage of the low-voltage battery of the electric automobile comprises a power battery system, a direct-current power supply converter, a low-voltage storage battery, a vehicle control unit and an intelligent vehicle machine;
the intelligent vehicle machine is electrically connected with the low-voltage storage battery; the vehicle control unit is used for controlling whether the power battery system is charged with high voltage or not; the vehicle control unit is also used for controlling the starting or stopping of the direct-current power converter;
the power battery system is used as an energy storage device of the electric automobile and provides a high-voltage power supply for the direct-current power supply converter when the power battery system is charged with high voltage;
the direct-current power supply converter obtains a high-voltage power supply from the power battery system, and converts the obtained high-voltage power supply into a low-voltage power supply to charge the low-voltage storage battery after being started;
the vehicle controller is further used for receiving the awakening signal of the intelligent vehicle machine and judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged or not;
when the low-voltage storage battery needs to be charged, the intelligent vehicle machine is used for awakening the vehicle controller and sending a message for requesting charging to the vehicle controller; the intelligent car machine is internally provided with a first preset voltage value required to be charged by the low-voltage storage battery, a second preset voltage value required to be stopped from being charged, and preset charging stop time.
Optionally, the power battery system further comprises an insulation detection device and sends the insulation resistance state of the whole vehicle to the whole vehicle controller;
and the vehicle controller is also used for detecting the vehicle door state and the door lock state of the electric vehicle in real time after being awakened by the awakening signal, receiving the whole vehicle insulation resistance state from the power battery system and judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged or not.
Further, to achieve the above object, the present invention also provides a computer-readable storage medium for storing processor-executable instructions, where the processor-executable instructions stored in the computer-readable storage medium, when executed, can cause a processor to implement the steps of the above-mentioned anti-power-loss automatic control method for the low-voltage battery of the electric vehicle.
Compared with the prior art, the anti-power-loss automatic control method for the low-voltage battery of the electric automobile, provided by the invention, is used for controlling the anti-power-loss automatic control system for the low-voltage battery of the electric automobile, and comprises the following steps: when the electric automobile is in a power-off state, the intelligent automobile machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value needing to be charged or not at regular time; if so, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit; the vehicle controller receives the charging request message and judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged; if yes, sending a message of allowing charging to the intelligent vehicle machine, controlling high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery; after the intelligent vehicle machine receives the message allowing charging, continuously judging whether the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging, continuously timing, and judging whether the preset charging stopping time is reached; if the second preset voltage value and/or the preset stop time are/is reached, the intelligent vehicle machine stops waking up the vehicle control unit and stops sending a charging request message to the vehicle control unit; and the vehicle control unit and the intelligent vehicle machine enter a dormant state.
Therefore, the automatic control method for preventing the power shortage of the low-voltage battery of the electric automobile disclosed by the invention realizes the automatic charging function of the low-voltage battery, when the automobile is parked in a power-off state, a discharging main loop of the low-voltage battery is not required to be cut off, the static current consumption requirements of some intelligent modules in a standby state are met, and the low-voltage battery can be ensured not to be in power shortage or over-discharge; and because the second preset voltage value for stopping charging and the preset stopping time are set, the overcharge of the low-voltage storage battery can be effectively prevented, so that the capacity attenuation of the low-voltage storage battery is reduced, the service life of the low-voltage storage battery is prolonged, the operation and maintenance cost of the whole vehicle is reduced, and the asset safety of the operation vehicle is improved.
Drawings
Fig. 1 is a system for automatically controlling the low-voltage battery of an electric vehicle to prevent power shortage according to various embodiments of the invention;
fig. 2 is a first flowchart illustrating steps of an automatic control method for preventing a low-voltage battery of an electric vehicle from being lack of power according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a second step of an automatic control method for preventing a power shortage of a low-voltage battery of an electric vehicle according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
As shown in fig. 1, the invention discloses an automatic control system for preventing power shortage of a low-voltage battery of an electric vehicle, wherein the automatic control system 100 for preventing power shortage of the low-voltage battery of the electric vehicle comprises a power battery system 1, a direct-current power converter 2, a low-voltage storage battery 3, a vehicle control unit 4 and an intelligent vehicle machine 5.
The power battery system 1, the direct-current power converter 2, the vehicle control unit 4, the intelligent vehicle machine 5 and the low-voltage storage battery 3 are electrically connected with one another; the intelligent vehicle machine 5 can be connected with an operation platform of the electric vehicle through a wireless network, and sends the charging state of the electric vehicle to the operation platform of the electric vehicle.
In the present invention, the low-voltage battery is collectively referred to as a low-voltage battery in the present invention when the nominal voltage of the low-voltage battery for a passenger car is 12V and the nominal voltage of the low-voltage battery for a commercial vehicle is 24V.
A power battery system: generally, the high-voltage power battery pack mainly includes a Battery Management System (BMS), high-voltage contactors, fuses, and the like.
In the invention, the power battery system 1 is used as an energy storage device of the electric automobile and provides a high-voltage power supply for the direct-current power converter 2 when the power battery system is charged with high voltage; the power battery system 1 further comprises an insulation detection device which can send the insulation resistance state of the whole vehicle to the whole vehicle controller 4; the power battery system 1 is controlled by the vehicle control unit 4.
Direct current power converter (DC/DC): in an electric automobile, a direct current power converter converts high-voltage power electricity into electricity for a low-voltage battery to charge the low-voltage battery, and provides working power for electronic devices.
In the invention, the direct-current power converter 2 obtains a high-voltage power supply from the power battery system 1, and converts the obtained high-voltage power supply into a low-voltage power supply to charge the low-voltage storage battery 3 after being started; the start or stop of the dc power converter 2 is controlled by the vehicle control unit 4.
The vehicle control unit: in the electric automobile, the unit is a central processing unit for coordinating, safely and efficiently working all systems of the whole automobile and is responsible for issuing relevant function instructions of the whole automobile, protecting faults and the like.
In the invention, the vehicle control unit 4 is used for controlling whether the power battery system 1 is subjected to high voltage; the vehicle control unit 4 is further configured to control the start or stop of the dc power converter 2. The vehicle control unit 4 is further configured to receive a wake-up signal of the intelligent vehicle machine 5, and the vehicle control unit 4 is further configured to detect a vehicle door state and a door lock state of the electric vehicle in real time after being awakened by the wake-up signal, receive a vehicle insulation resistance state from the power battery system 1, and determine whether the vehicle state of the electric vehicle allows the low-voltage storage battery 3 to be charged.
The intelligent vehicle machine is generally a vehicle-mounted terminal which is arranged on a vehicle driving platform and has multiple functions of ETC passing, 3G or above wireless communication, online navigation, road condition information, travel guide, shopping, entertainment audio and video and the like, is a standard product of an electric vehicle, and has the main function of collecting all relevant signal data of the vehicle and at least meeting the requirement of GBT32960 standard on wirelessly uploading information data to all levels of cloud platforms.
In the invention, when the low-voltage storage battery 3 needs to be charged, the intelligent vehicle 5 is used for waking up the vehicle controller 4 and sending a message requesting charging to the vehicle controller 4; the intelligent vehicle machine 5 is internally provided with a first preset voltage value V1 required to be charged by the low-voltage storage battery 3, a second preset voltage value V2 required to be stopped from being charged, and preset charging stop time T1.
Although the above description is made by taking the automatic control system for preventing the power shortage of the low-voltage battery of the electric vehicle as an example, it should be understood by those skilled in the art that the electric vehicle of the present invention includes not only the automatic control system for preventing the power shortage of the low-voltage battery of the electric vehicle, but also other structures and modules of the electric vehicle, and is not limited herein.
Based on the above-mentioned automatic control system 100 for preventing power shortage of the low-voltage battery of the electric vehicle, various embodiments of the method of the invention are provided.
Referring to fig. 2, fig. 2 is a flow chart of a first step of an automatic control method for preventing power loss of a low-voltage battery of an electric vehicle according to an embodiment of the present invention, as shown in fig. 2, the method includes:
s1, when the electric automobile is in a power-off state, the intelligent automobile machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value needing to be charged at regular time.
If so, go to step S2, otherwise, go to step S1.
In the invention, the vehicle is divided into two states, namely a power-on state and a power-off state, wherein the power-on state refers to the successful starting of the vehicle, the related high voltage is normally connected, the vehicle controller CAN send out power-on and the state word is valid in the vehicle CAN communication, otherwise, the vehicle controller is in the power-off state.
When the vehicle is in a power-off state, the high voltage is in a disconnected state, the controllers and the communication are in a dormant state, and the vehicle can enter a low-voltage battery power-loss-prevention working mode.
Specifically, when the electric automobile is in a power-off state, the intelligent vehicle machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value V1 which needs to be charged at regular time, namely, whether the low-voltage storage battery needs to be charged is judged. If the voltage value of the low-voltage storage battery is not lower than a first preset voltage value V1 which needs to be charged, judging that the low-voltage storage battery does not need to be charged, and continuously monitoring the voltage value of the low-voltage storage battery; and if the voltage value of the low-voltage storage battery is lower than a first preset voltage value V1 needing to be charged, determining that the low-voltage storage battery needs to be charged.
S2, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit.
Specifically, if the low-voltage storage battery needs to be charged, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit.
And S3, the vehicle control unit receives the charging request message and judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged.
If so, sending a charging permission message to the intelligent vehicle machine, and executing the step S4, otherwise, sending a charging non-permission message to the intelligent vehicle machine, and executing the step S9.
In the invention, after the vehicle controller is awakened, the vehicle controller receives a charging request message, judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged, if not, sends a charging non-permission message to the intelligent vehicle machine, and if so, sends a charging permission message to the intelligent vehicle machine.
Specifically, the judging whether the vehicle state of the electric vehicle allows the charging of the low-voltage storage battery may be that after the vehicle controller is awakened by an awakening signal, the vehicle door state and the door lock state of the electric vehicle are detected in real time, and the vehicle insulation resistance state from the power battery system is received, so as to judge whether the vehicle state of the electric vehicle allows the charging of the low-voltage storage battery;
the vehicle state of the electric vehicle comprises a vehicle door state, a door lock state and a whole vehicle insulation resistance state of the electric vehicle. The door state of the electric automobile generally comprises two states of opening the door and closing the door, the door lock state of the electric automobile generally comprises two states of unlocking the door lock and unlocking the door, and the insulation resistance state of the whole automobile sent by the power battery system generally comprises two states of allowing high voltage to be applied and not allowing high voltage to be applied.
Specifically, when all the conditions that the door of the electric vehicle is closed, the door of the electric vehicle is locked, and the insulation resistance state sent by the power battery system allows high voltage and high voltage are met, the vehicle control unit judges that the electric vehicle allows the low-voltage storage battery to be charged, namely that the current vehicle state of the electric vehicle allows the low-voltage storage battery to be charged, and sends a message of allowing charging to the intelligent vehicle machine.
When any one condition of the condition that a door of the electric automobile is opened or the door lock is not locked or the insulation resistance state sent by the power battery system does not allow high voltage electricity is met, the vehicle control unit judges that the electric automobile does not allow the low-voltage storage battery to be charged, namely the vehicle state of the current electric automobile does not allow the low-voltage storage battery to be charged, and sends a message of not allowing charging to the intelligent vehicle machine.
The current vehicle state of the electric vehicle is considered to allow the low-voltage storage battery to be charged only if all conditions that the vehicle door of the electric vehicle is closed, the vehicle door is locked and the insulation resistance state sent by the power battery system allows the high-voltage electricity are met, and the current vehicle state of the electric vehicle is considered not to allow the low-voltage storage battery to be charged as long as one or two conditions are not met, namely the vehicle door of the electric vehicle is opened, the door lock of the electric vehicle is not locked, and the insulation resistance state sent by the power battery system does not allow the high-voltage electricity.
And S4, controlling the high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery.
In the invention, if the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged; and after the message allowing charging is sent to the intelligent vehicle machine, controlling the high voltage of the power battery system, starting the direct current power supply converter to charge the low-voltage storage battery, and enabling the low-voltage storage battery to enter a charging state.
And S8, continuously judging whether the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging, continuously timing, and judging whether the preset charging stopping time is reached.
If the second preset voltage value and/or the preset stop time is reached, the step S9 is executed, otherwise, the step S8 is continuously executed.
Because the low-voltage storage battery is in a continuous charging state at the moment, in order to effectively prevent the low-voltage storage battery from being overcharged, a second preset voltage value V2 and a preset charging stop time T1, which are required by the low-voltage storage battery to stop charging, are arranged in the intelligent vehicle.
In the invention, in the process of continuously charging the low-voltage storage battery, whether the voltage value of the low-voltage storage battery reaches a second preset voltage value V2 for stopping charging is continuously monitored and judged, and whether the preset charging stop time T1 is reached is continuously timed.
If the second preset voltage value V2 and/or the preset stop time T1 are reached, that is, the second preset voltage value V2 is reached, the preset stop time T1 is reached, or both the second preset voltage value V2 and the preset stop time T1 are reached, it is indicated that the charging of the low-voltage storage battery needs to be stopped, the low-voltage storage battery is overcharged when the charging is continued, and the next step is performed, otherwise, whether the voltage value of the low-voltage storage battery reaches the second preset voltage value V2 and/or the preset stop time T1 when the charging is stopped is continuously monitored and judged.
As will be understood by those skilled in the art, since the first preset voltage value V1 is a voltage value required to charge the low-voltage battery and the second preset voltage value V2 is a voltage value required to stop charging, the first preset voltage value V1 is smaller than the second preset voltage value V2.
And S9, stopping waking up the vehicle control unit by the intelligent vehicle machine, and stopping sending a message for requesting charging to the vehicle control unit.
In the invention, when the voltage value of the low-voltage storage battery reaches a second preset voltage value V2 for stopping charging and/or a preset charging stop time T1, namely when any one of V2 or T1 reaches a preset value, the low-voltage storage battery is indicated to be stopped charging, the intelligent vehicle machine stops sending a charging request message to the vehicle controller, stops waking up the vehicle controller, and can send a charging stop state to an operation platform of the electric vehicle.
And S10, the vehicle control unit and the intelligent vehicle machine enter a sleep state.
Specifically, when the vehicle control unit and the intelligent vehicle machine both enter a sleep state, the automatic charging is finished.
Therefore, the automatic charging device can realize the automatic charging function of the low-voltage storage battery and can ensure that the low-voltage storage battery cannot be lack of power or over-discharged; and because the second preset voltage value for stopping charging and the preset stopping time are set, the overcharge of the low-voltage storage battery can be effectively prevented.
Referring to fig. 3, fig. 3 is a flowchart illustrating a second step of the method for automatically controlling the low-voltage battery of the electric vehicle to prevent power loss according to the embodiment of the present invention, wherein, compared with the method for automatically controlling the low-voltage battery of the electric vehicle to prevent power loss shown in fig. 2, steps S5 and S6 are included after step S4 and before step S8. As shown in fig. 3, the method includes:
s1, when the electric automobile is in a power-off state, the intelligent automobile machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value needing to be charged at regular time.
If so, go to step S2, otherwise, go to step S1.
S2, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit.
And S3, the vehicle control unit receives the charging request message and judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged.
If so, sending a charging permission message to the intelligent vehicle machine, and executing the step S4, otherwise, sending a charging non-permission message to the intelligent vehicle machine, and executing the step S9.
And S4, controlling the high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery.
S5, continuously judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged or not by the vehicle control unit in the charging process.
If so, continuing charging, otherwise, sending a message that charging is not allowed to the intelligent vehicle machine, and executing step S6.
When the vehicle control unit is awakened, the vehicle control unit judges that the vehicle state of the electric vehicle is the state that the low-voltage battery is allowed to be charged, the vehicle control unit starts to control the high voltage power of the power battery system, and after the direct-current power converter is started to charge the low-voltage battery, namely after step S4, at this time, the low-voltage battery is in a continuous charging state, but the vehicle state of the electric vehicle may change, if the vehicle state of the electric vehicle is kept in the state that the low-voltage battery is allowed to be charged, the charging is continued, and if the vehicle state of the electric vehicle changes to the state that the low-voltage battery is not allowed to be charged, further adjustment is needed. Therefore, there is also a need to continuously detect and determine whether the vehicle state of the electric vehicle allows the low-voltage battery to be charged during charging.
Specifically, the judging whether the vehicle state of the electric vehicle allows the charging of the low-voltage storage battery may be detecting the door state and the door lock state of the electric vehicle in real time, and receiving the insulation resistance state of the whole vehicle from the power battery system, so as to judge whether the vehicle state of the electric vehicle allows the charging of the low-voltage storage battery;
the vehicle state of the electric vehicle comprises a vehicle door state, a door lock state and a whole vehicle insulation resistance state of the electric vehicle. The door state of the electric automobile generally comprises two states of opening the door and closing the door, the door lock state of the electric automobile generally comprises two states of unlocking the door lock and unlocking the door, and the insulation resistance state of the whole automobile sent by the power battery system generally comprises two states of allowing high voltage to be applied and not allowing high voltage to be applied.
And only when all conditions that the vehicle door of the electric vehicle is closed and the vehicle door is locked and the insulation resistance state sent by the power battery system allows high voltage are continuously met, the current vehicle state of the electric vehicle is considered to allow the low-voltage storage battery to be continuously charged, and the charging state is maintained.
If the current vehicle state of the electric vehicle is determined not to allow the low-voltage battery to continue charging as long as the change occurs, that is, as long as one or two of the conditions are not met, the door of the electric vehicle is opened, the door of the electric vehicle is unlocked, and the insulation resistance state sent by the power battery system does not allow the high-voltage battery to continue charging, a message of not allowing charging is sent to the smart vehicle, and the process proceeds to the next step S6.
And S6, controlling the power battery system to discharge high voltage, and turning off the direct current power converter.
Specifically, if the current vehicle state of the electric vehicle does not allow the low-voltage battery to continue charging, after a charging disallowance message is sent to the smart car machine, it indicates that the current state does not allow charging, the vehicle controller controls the high-voltage power supply below the power battery system, and turns off the dc power converter, and then, the process goes to step S9.
And S8, continuously judging whether the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging, continuously timing, and judging whether the preset charging stopping time is reached.
If the second preset voltage value and/or the preset stop time is reached, the step S9 is executed, otherwise, the step S8 is continuously executed.
And S9, stopping waking up the vehicle control unit by the intelligent vehicle machine, and stopping sending a message for requesting charging to the vehicle control unit.
Specifically, in step S6, the vehicle control unit has sent a non-charging-permitted message to the smart car machine, and then, after receiving the non-charging-permitted message, the smart car machine stops waking up the vehicle control unit and stops sending a charging-request message to the vehicle control unit because the current state is not permitted to charge.
And S10, the vehicle control unit and the intelligent vehicle machine enter a sleep state.
The above method steps S1-S4 and S8 and S10 have no difference, and are not described herein again.
Therefore, the automatic control method for preventing the power shortage of the low-voltage battery of the electric automobile disclosed by the invention realizes the automatic charging function of the low-voltage battery, and when the automobile is parked in a power-off state, a discharging main loop of the low-voltage battery does not need to be cut off, so that the static current consumption requirements of some intelligent modules in a standby state are met, and the low-voltage battery can be ensured not to be in power shortage or over-discharge.
Of course, in some alternative embodiments, compared with the automatic control method for preventing the low-voltage battery of the electric vehicle from being lack of power shown in fig. 3, after step S4 and before step S8, step S7 (not shown in the figure) may be further included. The method comprises the following steps:
s1, when the electric automobile is in a power-off state, the intelligent automobile machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value needing to be charged at regular time.
If so, go to step S2, otherwise, go to step S1.
S2, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit.
And S3, the vehicle control unit receives the charging request message and judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged.
If so, sending a message allowing charging to the intelligent vehicle machine, and executing the step S4, otherwise, sending a message not allowing charging to the intelligent vehicle machine.
And S4, controlling the high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery.
S5, continuously judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged or not by the vehicle control unit in the charging process.
If so, continuing charging, otherwise, sending a message that charging is not allowed to the intelligent vehicle machine, and executing step S6.
And S6, controlling the power battery system to discharge high voltage, and turning off the direct current power converter.
And S7, judging whether the message received by the intelligent vehicle machine is a message allowing charging.
If the message is a message allowing charging, executing step S8; if the message is not allowed to be charged, step S9 is executed.
In the invention, in step S3, if the vehicle state of the electric vehicle allows the low-voltage battery to be charged, the vehicle controller sends a message of allowing charging to the smart car machine; if the vehicle state of the electric vehicle does not allow the low-voltage storage battery to be charged, the vehicle control unit sends a charging disallowance message to the intelligent vehicle machine; in step S5, if the vehicle state of the electric vehicle does not allow the low-voltage battery to be charged during the continuous charging process, the vehicle controller sends a message that charging is not allowed to the smart car machine.
Namely, the intelligent vehicle machine receives the message allowing charging and the message not allowing charging sent by the vehicle control unit. Then, the next step can be performed by judging what kind of message the smart car machine receives. If the message is a message allowing charging, executing step S8; if the message is not allowed to be charged, step S9 is executed.
And S8, continuously judging whether the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging, continuously timing, and judging whether the preset charging stopping time is reached.
If the second preset voltage value and/or the preset stop time is reached, the step S9 is executed, otherwise, the step S8 is continuously executed.
And S9, stopping waking up the vehicle control unit by the intelligent vehicle machine, and stopping sending a message for requesting charging to the vehicle control unit.
Specifically, the intelligent vehicle machine receives a message that charging is not allowed and when the voltage value of the low-voltage storage battery reaches a second preset voltage value V2 and/or a preset charging stop time T1, which indicate that the low-voltage storage battery needs to stop charging, the intelligent vehicle machine stops sending a message requesting charging to the vehicle controller, stops waking up the vehicle controller, and can send a charging stop state to an operation platform of the electric vehicle.
And S10, the vehicle control unit and the intelligent vehicle machine enter a sleep state.
The above method steps are different from S7 and S9, and S1 to S6 and S10 are the same as the above embodiments, and are not described herein again.
Therefore, the automatic control method for preventing the power shortage of the low-voltage battery of the electric automobile disclosed by the invention realizes the automatic charging function of the low-voltage battery, when the automobile is parked in a power-off state, a discharging main loop of the low-voltage battery is not required to be cut off, the static current consumption requirements of some intelligent modules in a standby state are met, and the low-voltage battery can be ensured not to be in power shortage or over-discharge; and because the second preset voltage value for stopping charging and the preset stopping time are set, the overcharge of the low-voltage storage battery can be effectively prevented, so that the capacity attenuation of the low-voltage storage battery is reduced, the service life of the low-voltage storage battery is prolonged, the operation and maintenance cost of the whole vehicle is reduced, and the asset safety of the operation vehicle is improved.
Of course, in some alternative embodiments, before step S1, the method may further include step S0 (not shown in the figure):
s0, detecting whether the electric automobile is in a power-off state; if so, go to step S1, otherwise, go to step S0.
In the invention, whether the electric automobile is in a power-off state can be detected in advance. The vehicle is divided into two states, namely a power-on state and a power-off state, wherein the power-on state refers to the successful starting of the vehicle, the related high voltage is normally connected, the vehicle controller CAN send out 'power-on' and the state word is valid in the vehicle CAN communication, and otherwise, the vehicle controller is in the power-off state. When the vehicle is in a power-off state, the high voltage is in a disconnected state, the controllers and the communication are in a dormant state, and the vehicle can enter a low-voltage battery power-loss-prevention working mode.
Therefore, in order to confirm whether the vehicle enters the low-voltage battery power-shortage prevention operation mode, it is necessary to previously monitor whether the electric vehicle is in a power-off state.
It will be understood by those skilled in the art that all or part of the steps of the method for implementing the above embodiments may be implemented by hardware associated with at least one program instruction, the at least one program may be stored in a computer readable storage medium, and when executed, the at least one program may comprise the steps of:
s1, when the electric automobile is in a power-off state, the intelligent vehicle machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value needing to be charged at regular time; if yes, go to step S2, otherwise, go to step S1;
s2, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit;
s3, the vehicle control unit receives the charging request message and judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged; if so, sending a message allowing charging to the intelligent vehicle machine, and executing the step S4, otherwise, sending a message not allowing charging to the intelligent vehicle machine, and executing the step S9;
s4, controlling high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery;
s8, continuously judging whether the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging, continuously timing, and judging whether the preset charging stopping time is reached; if the second preset voltage value and/or the preset stop time is reached, executing the step S9, otherwise, continuing to execute the step S8;
s9, the intelligent vehicle machine stops waking up the vehicle control unit and stops sending a message for requesting charging to the vehicle control unit;
and S10, the vehicle control unit and the intelligent vehicle machine enter a sleep state.
Optionally, after step S4, before step S8, the method further comprises the steps of:
s5, continuously judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged by the vehicle control unit in the charging process; if so, continuing charging, otherwise, sending a message that charging is not allowed to the intelligent vehicle machine, and executing step S6;
and S6, controlling the power battery system to discharge high voltage, and turning off the direct current power converter.
Optionally, after step S4, before step S8, the method further comprises the steps of:
s7, judging whether the message received by the intelligent vehicle machine is a message allowing charging; if the message is a message allowing charging, executing step S8; if the message is not allowed to be charged, step S9 is executed.
Optionally, the determining whether the vehicle state of the electric vehicle allows the low-voltage battery to be charged includes:
detecting the door state and the door lock state of the electric automobile in real time, receiving the insulation resistance state of the whole automobile from the power battery system, and judging whether the vehicle state of the electric automobile allows the low-voltage storage battery to be charged or not;
the vehicle state of the electric vehicle comprises a vehicle door state, a door lock state and a whole vehicle insulation resistance state of the electric vehicle.
Optionally, the determining whether the vehicle state of the electric vehicle allows the low-voltage battery to be charged includes:
when any one condition of opening a door of the electric automobile or unlocking the door of the electric automobile or the condition that the insulation resistance state sent by the power battery system does not allow high-voltage electricity is met, the whole automobile controller judges that the electric automobile does not allow the low-voltage storage battery to be charged;
and when all conditions that the door of the electric automobile is closed, the door is locked and the insulation resistance state sent by the power battery system allows high voltage electricity are met, the whole automobile controller judges that the electric automobile allows the low-voltage storage battery to be charged.
Optionally, before step S1, the method further comprises the steps of:
s0, detecting whether the electric automobile is in a power-off state; if so, go to step S1, otherwise, go to step S0.
Optionally, the first preset voltage value is smaller than the second preset voltage value.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides an electric automobile low voltage battery prevents insufficient voltage automatic control method which characterized in that, this method is used for controlling electric automobile low voltage battery prevents insufficient voltage automatic control system, electric automobile low voltage battery prevents insufficient voltage automatic control system includes power battery system, DC power supply converter, low-voltage battery, vehicle control unit and intelligent car machine, electric automobile low voltage battery prevents insufficient voltage automatic control method includes following step:
s1, when the electric automobile is in a power-off state, the intelligent vehicle machine detects whether the voltage value of the low-voltage storage battery is lower than a first preset voltage value needing to be charged at regular time; if yes, go to step S2, otherwise, go to step S1;
s2, the intelligent vehicle machine wakes up the vehicle control unit and sends a message requesting charging to the vehicle control unit;
s3, the vehicle control unit receives the charging request message and judges whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged; if so, sending a message allowing charging to the intelligent vehicle machine, and executing the step S4, otherwise, sending a message not allowing charging to the intelligent vehicle machine, and executing the step S9;
s4, controlling high voltage of the power battery system, and starting the direct current power converter to charge the low-voltage storage battery;
s8, continuously judging whether the voltage value of the low-voltage storage battery reaches a second preset voltage value for stopping charging, continuously timing, and judging whether the preset charging stopping time is reached; if the second preset voltage value and/or the preset stop time is reached, executing the step S9, otherwise, continuing to execute the step S8;
s9, the intelligent vehicle machine stops waking up the vehicle control unit and stops sending a message for requesting charging to the vehicle control unit;
and S10, the vehicle control unit and the intelligent vehicle machine enter a sleep state.
2. The automatic control method for preventing the electric vehicle low-voltage battery from being lack of power according to claim 1, wherein after step S4 and before step S8, the method further comprises the steps of:
s5, continuously judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged by the vehicle control unit in the charging process; if so, continuing charging, otherwise, sending a message that charging is not allowed to the intelligent vehicle machine, and executing step S6;
and S6, controlling the power battery system to discharge high voltage, and turning off the direct current power converter.
3. The automatic control method for preventing the low-voltage battery of the electric automobile from being lack of power according to claim 2, wherein after the step S4 and before the step S8, the method further comprises the steps of:
s7, judging whether the message received by the intelligent vehicle machine is a message allowing charging; if the message is a message allowing charging, executing step S8; if the message is not allowed to be charged, step S9 is executed.
4. The automatic control method for preventing the electric shortage of the low-voltage battery of the electric automobile according to any one of claims 1 to 3, wherein the judging whether the vehicle state of the electric automobile allows the low-voltage battery to be charged comprises:
detecting the door state and the door lock state of the electric automobile in real time, receiving the insulation resistance state of the whole automobile from the power battery system, and judging whether the vehicle state of the electric automobile allows the low-voltage storage battery to be charged or not;
the vehicle state of the electric vehicle comprises a vehicle door state, a door lock state and a whole vehicle insulation resistance state of the electric vehicle.
5. The automatic control method for preventing the electric vehicle low-voltage battery from being lack of power according to claim 4, wherein the judging whether the vehicle state of the electric vehicle allows the low-voltage battery to be charged comprises the following steps:
when any one condition of opening a door of the electric automobile or unlocking the door of the electric automobile or the condition that the insulation resistance state sent by the power battery system does not allow high-voltage electricity is met, the whole automobile controller judges that the electric automobile does not allow the low-voltage storage battery to be charged;
and when all conditions that the door of the electric automobile is closed, the door is locked and the insulation resistance state sent by the power battery system allows high voltage electricity are met, the whole automobile controller judges that the electric automobile allows the low-voltage storage battery to be charged.
6. The automatic control method for preventing the electric vehicle low-voltage battery from being lack of power according to claim 1, wherein before step S1, the method further comprises the steps of:
s0, detecting whether the electric automobile is in a power-off state; if so, go to step S1, otherwise, go to step S0.
7. The automatic control method for preventing the electric deficiency of the low-voltage battery of the electric automobile according to claim 1, wherein the first preset voltage value is smaller than the second preset voltage value.
8. The automatic power shortage prevention control system for the low-voltage battery of the electric automobile is characterized by comprising a power battery system, a direct-current power supply converter, a low-voltage storage battery, a whole automobile controller and an intelligent automobile machine;
the intelligent vehicle machine is electrically connected with the low-voltage storage battery; the vehicle control unit is used for controlling whether the power battery system is charged with high voltage or not; the vehicle control unit is also used for controlling the starting or stopping of the direct-current power converter;
the power battery system is used as an energy storage device of the electric automobile and provides a high-voltage power supply for the direct-current power supply converter when the power battery system is charged with high voltage;
the direct-current power supply converter obtains a high-voltage power supply from the power battery system, and converts the obtained high-voltage power supply into a low-voltage power supply to charge the low-voltage storage battery after being started;
the vehicle controller is further used for receiving the awakening signal of the intelligent vehicle machine and judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged or not;
when the low-voltage storage battery needs to be charged, the intelligent vehicle machine is used for awakening the vehicle controller and sending a message for requesting charging to the vehicle controller; the intelligent car machine is internally provided with a first preset voltage value required to be charged by the low-voltage storage battery, a second preset voltage value required to be stopped from being charged, and preset charging stop time.
9. The automatic control system for preventing the power shortage of the low-voltage battery of the electric automobile according to claim 8, wherein the power battery system further comprises an insulation detection device and sends the insulation resistance state of the whole automobile to the whole automobile controller;
and the vehicle controller is also used for detecting the vehicle door state and the door lock state of the electric vehicle in real time after being awakened by the awakening signal, receiving the whole vehicle insulation resistance state from the power battery system and judging whether the vehicle state of the electric vehicle allows the low-voltage storage battery to be charged or not.
10. A computer-readable storage medium storing processor-executable instructions, the processor-executable instructions stored in the computer-readable storage medium, when executed, can cause a processor to implement the electric vehicle low-voltage battery power-loss prevention automatic control method according to any one of claims 1 to 7.
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Application publication date: 20210709 |