CN113147503A - Electric vehicle power supply management method - Google Patents
Electric vehicle power supply management method Download PDFInfo
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- CN113147503A CN113147503A CN202110418967.1A CN202110418967A CN113147503A CN 113147503 A CN113147503 A CN 113147503A CN 202110418967 A CN202110418967 A CN 202110418967A CN 113147503 A CN113147503 A CN 113147503A
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- 238000007726 management method Methods 0.000 title claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims abstract description 54
- 238000003745 diagnosis Methods 0.000 claims abstract description 53
- 230000002159 abnormal effect Effects 0.000 claims abstract description 19
- 230000005611 electricity Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007958 sleep Effects 0.000 description 4
- 239000002253 acid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004171 remote diagnosis Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000004622 sleep time Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
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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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- 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
- B60R16/03—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 supply of electrical power to vehicle subsystems or for
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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
Abstract
The invention discloses a power supply management method for an electric vehicle, which comprises the following steps: when the vehicle is in a parking state, monitoring first stored electric quantity of the low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the first stored electric quantity; monitoring the discharge current of the low-voltage power supply system, and judging whether the vehicle has abnormal power consumption according to the discharge current; monitoring whether the vehicle-mounted software is upgraded or not, and judging whether a high-voltage power supply system is started or not according to the software upgrading condition; monitoring the fault diagnosis duration of the vehicle, and judging whether to start a high-voltage power supply system according to the fault diagnosis duration; when the vehicle is in a driving state, monitoring second stored electric quantity of the low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the second stored electric quantity; monitoring the power load of the low-voltage power supply system, and judging whether to start the high-voltage power supply system or not according to the power load; the parking state and the driving state of the vehicle are respectively managed, a low-voltage power supply system of the vehicle is protected, and the performance of the whole vehicle product is improved.
Description
Technical Field
The invention belongs to the technical field of power management, and particularly relates to a power management method for an electric vehicle.
Background
For power management of electric vehicles, the existing scheme only actively starts a high-voltage power supply system to supply power to a whole vehicle and charge a storage battery when a user uses the vehicle, and does not consider the power consumption situation during user vehicle use habit, remote operation (background OTA upgrading, remote diagnosis, remote operation vehicle function), abnormal power consumption after parking and other situations, so that the power consumption requirements of the whole vehicle in different states cannot be met, and the user vehicle use experience is poor. Meanwhile, the low-voltage storage battery cannot be timely supplemented after deep discharge possibly occurs in the conditions, the low-voltage storage battery has insufficient power or the service life of the low-voltage storage battery is shortened due to crystallization of active substances, and the performance of the whole vehicle product is influenced.
Disclosure of Invention
The invention aims to provide a power supply management method for an electric vehicle, aiming at the defects in the prior art, which respectively manages the parking state and the driving state of the vehicle, and respectively manages the charging of a low-voltage power supply system, the abnormal power consumption of the vehicle, the upgrading of vehicle-mounted software, the fault diagnosis condition, the power load of the low-voltage power supply system and other conditions, protects the low-voltage power supply system of the vehicle, and improves the performance of the whole vehicle.
In order to achieve the above object, the present invention provides an electric vehicle power management method, comprising:
when a vehicle is in a parking state, monitoring first stored electric quantity of a low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the first stored electric quantity; monitoring the discharge current of the low-voltage power supply system, and judging whether the vehicle has abnormal power consumption according to the discharge current; monitoring whether the vehicle-mounted software is upgraded or not, and judging whether a high-voltage power supply system is started or not according to the software upgrading condition; monitoring the fault diagnosis duration of a vehicle, and judging whether to start the high-voltage power supply system according to the fault diagnosis duration;
when the vehicle is in a driving state, monitoring second stored electric quantity of the low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the second stored electric quantity; and monitoring the power load of the low-voltage power supply system, and judging whether to start the high-voltage power supply system or not according to the power load.
Optionally, the monitoring a first stored electric quantity of the low-voltage power supply system, and determining whether to charge the low-voltage power supply system according to the first stored electric quantity includes:
monitoring the duration of the vehicle in a flameout state;
monitoring a first stored electric quantity of the low-voltage power supply system when the duration that the vehicle is in a flameout state reaches a first set duration;
judging whether the first stored electric quantity is lower than a first set electric quantity;
and when the first stored electric quantity is lower than the first set electric quantity, starting the high-voltage power supply system to charge the low-voltage power supply system.
Optionally, detect through low voltage battery sensor first storage electric quantity, low voltage battery sensor is connected with low pressure power supply control module, by low pressure power supply control module judges whether first storage electric quantity is less than first settlement electric quantity, low pressure power supply control module is connected with high voltage battery management system, by low pressure power supply control module control high voltage battery management system is right low pressure power supply system charges, low pressure power supply control module is connected with the intelligent terminal communication, by low pressure power supply control module to send low pressure power supply system's charging information on the intelligent terminal.
Optionally, the monitoring a discharge current of the low-voltage power supply system, and determining whether abnormal power consumption occurs in the vehicle according to the discharge current includes:
setting an abnormal electricity utilization current of the vehicle;
detecting the discharge current by the battery sensor;
and when the discharge current is larger than the abnormal electricity utilization current, sending reminding information to the intelligent terminal through the low-voltage power supply control module.
Optionally, the monitoring whether the vehicle-mounted software is upgraded, and determining whether to start the high-voltage power supply system according to the software upgrading condition includes:
receiving vehicle-mounted software upgrading information through a low-voltage power supply control module;
when the low-voltage power supply control module receives vehicle-mounted software upgrading information, the high-voltage power supply system is started to supply power to the vehicle-mounted software;
after the vehicle-mounted software is upgraded, the high-voltage power supply system is stopped;
and sending the upgrading progress of the vehicle-mounted software to an intelligent terminal in real time.
Optionally, the monitoring a fault diagnosis duration of the vehicle, and determining whether to activate the high-voltage power supply system according to the fault diagnosis duration includes:
setting a second set time length;
when the fault diagnosis duration is shorter than the second set duration, the low-voltage power supply system supplies power to the fault diagnosis module;
and when the fault diagnosis duration is longer than the second set duration, starting the high-voltage power supply system to supply power to the diagnosis module.
Optionally, when the high-voltage power supply system fails to supply power to the fault diagnosis module, the first stored power is detected through a low-voltage battery sensor, whether the first stored power is lower than a second set power is judged, if the first stored power is lower than the second set power, fault diagnosis is stopped, fault diagnosis stopping information is sent to the intelligent terminal, and if the first stored power is higher than the second set power, the required power for residual diagnosis is calculated through a low-voltage battery management system of the vehicle.
Optionally, the monitoring a second amount of stored power of the low-voltage power supply system, and determining whether to charge the low-voltage power supply system according to the second amount of stored power includes:
monitoring the second stored power of the low-voltage power supply system through a low-voltage battery sensor;
judging whether the second stored electric quantity is lower than a third set electric quantity;
when the second stored electric quantity is lower than the third set electric quantity, a low-voltage power supply control module sends a prompt of starting a high-voltage power supply system to a vehicle central control system and records a first prompt duration;
and if the first reminding time length exceeds a third set time length, the high-voltage power supply system is not started successfully, and the low-voltage power supply system is stopped.
Optionally, the monitoring the electrical load of the low-voltage power supply system, and determining whether to activate the high-voltage power supply system according to the electrical load includes:
monitoring the power consumption of the low-voltage power supply system in unit time;
if the power consumption of the low-voltage power supply system in unit time is larger than the set power consumption, sending a prompt for starting the high-voltage power supply system to a vehicle central control system through a low-voltage power supply control module and recording a second prompt duration;
and if the second reminding time length exceeds a fourth set time length, the high-voltage power supply system is not started successfully, and the low-voltage power supply system is stopped.
Optionally, when the low-voltage power supply system is charged, the temperature of the low-voltage battery is monitored, and the charging voltage of the low-voltage power supply system is adjusted according to the temperature of the low-voltage battery.
The invention provides a power supply management method for an electric vehicle, which has the beneficial effects that:
1. the power supply management method respectively manages the parking state and the driving state of the vehicle, and respectively manages the charging of a low-voltage power supply system, the abnormal power consumption of the vehicle, the upgrading of vehicle-mounted software, the fault diagnosis condition, the power load of the low-voltage power supply system and other conditions, protects the low-voltage power supply system of the vehicle, and improves the performance of the whole vehicle;
2. the power supply management method provides a more accurate charging control mode of the low-voltage power supply system, so that the low-voltage power supply system is charged more timely, and the service life of the low-voltage power supply system can be prolonged;
3. the power management method can send the power management information of the vehicle to the intelligent terminal, so that a user can know the power management condition of the vehicle conveniently;
4. the power supply management method can send a prompt to a central control system of the vehicle, is favorable for helping a user to form good vehicle using habits, and protects a low-voltage power supply system of the vehicle.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
Fig. 1 shows a block diagram of a method of electric vehicle power management according to an embodiment of the present invention.
Fig. 2 shows a charging block diagram of a low-voltage power supply system of a vehicle in a parking state according to an embodiment of the present invention.
Fig. 3 shows a block diagram for determining abnormal power usage in a stopped state of a vehicle according to an embodiment of the present invention.
Fig. 4 shows a block diagram of a software upgrade power supply for a vehicle in a parking state according to an embodiment of the present invention.
Fig. 5 shows a vehicle fault diagnosis power supply block diagram in a parking state of a vehicle according to an embodiment of the present invention.
Fig. 6 shows a charging block diagram of a low-voltage power supply system of a vehicle in a driving state according to an embodiment of the invention.
Fig. 7 shows a block diagram of a vehicle powered by an electrical load in a driving state according to an embodiment of the present invention.
Fig. 8 shows a charging block diagram of a low voltage power supply system of an electric vehicle power management method according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides a power management method of an electric vehicle, which comprises the following steps:
when the vehicle is in a parking state, monitoring first stored electric quantity of the low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the first stored electric quantity; monitoring the discharge current of the low-voltage power supply system, and judging whether the vehicle has abnormal power consumption according to the discharge current; monitoring whether the vehicle-mounted software is upgraded or not, and judging whether a high-voltage power supply system is started or not according to the software upgrading condition; monitoring the fault diagnosis duration of the vehicle, and judging whether to start a high-voltage power supply system according to the fault diagnosis duration;
when the vehicle is in a driving state, monitoring second stored electric quantity of the low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the second stored electric quantity; and monitoring the power load of the low-voltage power supply system, and judging whether to start the high-voltage power supply system or not according to the power load.
Specifically, referring to fig. 1, the power management method manages the parking state and the driving state of the vehicle, and manages the charging of the low-voltage power supply system, the abnormal power consumption of the vehicle, the upgrading of the vehicle-mounted software, the fault diagnosis condition, the power load of the low-voltage power supply system, and the like, so as to protect the low-voltage power supply system of the vehicle and improve the performance of the whole vehicle.
In this embodiment, monitoring a first amount of power stored in the low voltage power supply system, and determining whether to charge the low voltage power supply system according to the first amount of power stored includes:
monitoring the duration of the vehicle in a flameout state;
monitoring a first storage capacity of a low-voltage power supply system when the duration that the vehicle is in a flameout state reaches a first set duration;
judging whether the first stored electric quantity is lower than a first set electric quantity;
and when the first stored electric quantity is lower than the first set electric quantity, starting the high-voltage power supply system to charge the low-voltage power supply system.
Specifically, referring to fig. 2, after the vehicle is parked, the vehicle is locked, the entire vehicle network enters a sleep state, the low-voltage power supply control module starts to time, after the sleep time exceeds 24 hours, the low-voltage battery sensor detects that the electric quantity of the low-voltage battery of the low-voltage power supply system is lower than 55% (the critical state of the freezing point of the electrolyte of the lead-acid battery in the low-temperature environment of-30 ℃ is selected, at this time, the minimum electric quantity for starting and discharging the vehicle is satisfied), the low-voltage battery sensor sends a low-power wake-up signal to the low-voltage power supply control module through the LIN network, after receiving the low-power wake-up signal, the low-voltage power supply control module sends an upper-voltage request signal to the high-voltage Battery Management System (BMS), the high-voltage power supply system in the high-voltage battery management system powers up the direct-current controller (DC/DC) and charges the low-voltage battery, and the low-voltage battery stops charging when the electric quantity is 100%, and simultaneously, sending the charging state to the mobile phone of the user through the background.
In this embodiment, a first stored electric quantity is detected by a low-voltage battery sensor, the low-voltage battery sensor is connected with a low-voltage power supply control module, the low-voltage power supply control module is used for judging whether the first stored electric quantity is lower than a first set electric quantity, the low-voltage power supply control module is connected with a high-voltage battery management system, the low-voltage power supply control module is used for controlling the high-voltage battery management system to charge the low-voltage power supply system, the low-voltage power supply control module is in communication connection with the intelligent terminal, and the low-voltage power supply control module is used for sending charging information of the low-voltage power supply system to the intelligent terminal.
In this embodiment, the smart terminal is a mobile phone of a user.
In the present embodiment, monitoring the discharge current of the low-voltage power supply system, and determining whether the abnormal power consumption of the vehicle has occurred based on the discharge current includes:
setting an abnormal electricity utilization current of the vehicle;
detecting a discharge current by a battery sensor;
and when the discharge current is larger than the abnormal electricity utilization current, sending reminding information to the intelligent terminal through the low-voltage power supply control module.
Specifically, referring to fig. 3, after the whole vehicle is dormant, the low-voltage battery sensor monitors the discharge current of the low-voltage battery, if the discharge current is larger than the set abnormal electricity consumption current (the dormancy currents set by different vehicle types are different), the state information such as the discharge current value and the duration is recorded in real time, the cloud background records data, and meanwhile, the cloud background sends a reminding message to the mobile phone of the user to remind the user of checking and maintaining in time.
In this embodiment, monitoring whether the vehicle-mounted software is upgraded, and determining whether to enable the high-voltage power supply system according to the software upgrading condition includes:
receiving vehicle-mounted software upgrading information through a low-voltage power supply control module;
when the low-voltage power supply control module receives the upgrading information of the vehicle-mounted software, the high-voltage power supply system is started to supply power to the vehicle-mounted software;
after the vehicle-mounted software is upgraded, the high-voltage power supply system is stopped;
and sending the upgrading progress of the vehicle-mounted software to the intelligent terminal in real time.
Specifically, referring to fig. 4, in a 4G/5G network environment, when a cloud background performs software push OTA upgrade on vehicle-mounted software of a vehicle, a remote control module (TBOX) sends a software upgrade signal, a low-voltage power supply control module switches a power supply mode to a high-voltage power supply system to supply power after receiving the software upgrade signal, the high-voltage power supply system supplies power to the entire vehicle through a dc conversion controller, and after the OTA upgrade and program check are completed, the high-voltage power supply system stops supplying power, and the entire vehicle sleeps; the OTA sends software upgrading estimated time to confirm to the user mobile phone through the cloud backstage during upgrading (can not use the vehicle during upgrading, ensures that the user upgrades when not using the vehicle, avoids influencing the user and uses the vehicle), and the user can look over the upgrading state in real time through cell-phone APP simultaneously.
In this embodiment, monitoring a fault diagnosis duration of the vehicle, and determining whether to activate the high-voltage power supply system according to the fault diagnosis duration includes:
setting a second set time length;
when the fault diagnosis duration is shorter than a second set duration, the low-voltage power supply system supplies power to the fault diagnosis module;
and when the fault diagnosis duration is longer than a second set duration, starting the high-voltage power supply system to supply power to the diagnosis module.
Specifically, referring to fig. 5, when a vehicle has a fault and needs remote fault diagnosis/data uploading, the low-voltage power supply control module times the fault diagnosis time, the second set time period is 30 minutes, after the second set time period exceeds 30 minutes, the high-voltage power supply system is awakened to supply power to the entire vehicle through the dc conversion controller, and after the diagnosis is finished, the high-voltage power supply system is stopped to supply power, and the entire vehicle sleeps.
In this embodiment, when the high-voltage power supply system fails to supply power to the fault diagnosis module, the low-voltage battery sensor detects the first stored power, determines whether the first stored power is lower than the second set power, stops fault diagnosis if the first stored power is lower than the second set power, and sends information for stopping fault diagnosis to the intelligent terminal, and calculates the power required for residual diagnosis through the low-voltage battery management system of the vehicle if the first stored power is higher than the second set power.
Specifically, when a vehicle breaks down and needs remote fault diagnosis and data uploading, the low-voltage power supply control module times fault diagnosis time, the second set time is 30 minutes, after the second set time exceeds 30 minutes, the high-voltage power supply system is awakened to supply power to the whole vehicle through the direct-current conversion controller, after the diagnosis is finished, the high-voltage power supply system is stopped supplying power, and the whole vehicle sleeps; if the high-voltage power supply system has a fault and high-voltage power supply cannot be carried out, the low-voltage power supply control module is used for carrying out fault diagnosis continuously by supplying power to the low-voltage power supply system according to a first stored electric quantity value fed back by the low-voltage battery sensor, the second set electric quantity is 80%, when the first stored electric quantity value is not less than 80%, the low-voltage battery management system calculates the electric quantity required by residual diagnosis, and when the low-voltage power supply control module judges that the stored electric quantity of the low-voltage power supply system is consumed to 55%, whether normal fault diagnosis and data uploading can be guaranteed or not can be guaranteed, and if the normal fault diagnosis and data uploading cannot be guaranteed, the cloud background is informed to send information that remote diagnosis cannot be guaranteed to normal diagnosis/uploading due to insufficient electric quantity to the user mobile phone.
In this embodiment, monitoring a second amount of power stored in the low-voltage power supply system, and determining whether to charge the low-voltage power supply system according to the second amount of power stored includes:
monitoring a second stored electric quantity of the low-voltage power supply system through a low-voltage battery sensor;
judging whether the second stored electric quantity is lower than a third set electric quantity;
when the second stored electric quantity is lower than a third set electric quantity, a low-voltage power supply control module sends a prompt for starting a high-voltage power supply system to a vehicle central control system and records a first prompt duration;
and if the first reminding time length exceeds the third set time length, the high-voltage power supply system is not started successfully, and the low-voltage power supply system is stopped.
Specifically, referring to fig. 6, when the ignition switch is powered ON/ACC shift, the low-voltage battery sensor monitors that the first stored power is lower than 75-80% (generally, it is considered that the power of the lead-acid battery for the vehicle is lower than 75-80% and deep power loss occurs, and deep discharge for many times during the use of the user may affect the service life of the battery and even damage the battery), and sends the power information to the low-voltage power supply control module, and first, the low-voltage power supply control module sends a prompt to start the high-voltage power supply system through the network and records the first prompt duration, and the prompt instruction reminds that the battery is low in power in a mode of displaying the prompt by the meter, and please start the high voltage, otherwise the system is closed within 2 minutes, and after 2 minutes of the prompt occurs, if the user does not start the operation of supplying power to the high-voltage power supply system, the low-voltage power supply control module sends an instruction through the network to close the heavy-load electrical equipment (such as an air conditioner, Heating and the like) and then the power mode of the low-voltage power supply system is switched to an OFF gear so as to reduce the power consumption of the low-voltage system and ensure that the vehicle can be started normally.
In this embodiment, monitoring the electrical load of the low-voltage power supply system, and determining whether to activate the high-voltage power supply system according to the electrical load includes:
monitoring the power consumption of a low-voltage power supply system in unit time;
if the power consumption of the low-voltage power supply system in unit time is larger than the set power consumption, sending a prompt for starting the high-voltage power supply system to a vehicle central control system through a low-voltage power supply control module and recording a second prompt duration;
and if the second reminding time length exceeds the fourth set time length, the high-voltage power supply system is not started successfully, and the low-voltage power supply system is stopped.
Specifically, referring to fig. 7, when the ignition switch is powered ON/ACC shift, the power consumption time of the low voltage power supply system exceeds 30min (under the condition of normal use of the vehicle, the electric quantity of the low voltage battery is generally kept at 80-100%, the current of the whole vehicle is large when the vehicle is powered ON/ACC, the low voltage battery consumes fast, 30min can consume about 10-20% of power according to the capacity of the low voltage battery, the low voltage power supply control module can consume electricity continuously, the low voltage battery can influence the use of the low voltage battery, the low voltage power supply control module sends a prompt of starting the high voltage power supply system through the network and records a second prompt duration, the prompt instruction reminds that the electric quantity consumes too much in a voice and instrument display prompt mode, the system starts high voltage, otherwise, the system is closed within 2 minutes, if the user does not start the operation of supplying power to the high voltage power supply system, the low voltage power supply control module sends an instruction through the network after the prompt appears for 2 minutes, and (3) turning OFF heavy-load electrical appliances (such as air conditioning, heating and other functions), and then switching the power mode of the low-voltage power supply system to an OFF gear so as to reduce the electricity consumption of the low-voltage system and ensure that the vehicle can be started normally.
In the present embodiment, when the low-voltage power supply system is charged, the temperature of the low-voltage battery is monitored, and the charging voltage of the low-voltage power supply system is adjusted according to the temperature of the low-voltage battery.
Specifically, referring to fig. 8, when the low-voltage power supply system is charged, the temperature of the battery is monitored by the low-voltage battery sensor, if the temperature exceeds 40 ℃ (generally, the internal temperature exceeds 50 ℃, the water loss is increased, the internal resistance is increased, the negative electrode of the low-voltage battery is easy to vulcanize, the service life is affected, and the low-voltage battery is damaged), the low-voltage battery sensor sends a temperature signal to the low-voltage power supply control module through LIN, the low-voltage power supply control module sends a signal to the high-voltage Battery Management System (BMS), and the direct-current conversion controller (DC/DC) is controlled to reduce the charging voltage to 13.8V, reduce the heat generated by the low-voltage battery, and protect the low-voltage battery.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. An electric vehicle power management method, comprising:
when a vehicle is in a parking state, monitoring first stored electric quantity of a low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the first stored electric quantity; monitoring the discharge current of the low-voltage power supply system, and judging whether the vehicle has abnormal power consumption according to the discharge current; monitoring whether the vehicle-mounted software is upgraded or not, and judging whether a high-voltage power supply system is started or not according to the software upgrading condition; monitoring the fault diagnosis duration of a vehicle, and judging whether to start the high-voltage power supply system according to the fault diagnosis duration;
when the vehicle is in a driving state, monitoring second stored electric quantity of the low-voltage power supply system, and judging whether to charge the low-voltage power supply system according to the second stored electric quantity; and monitoring the power load of the low-voltage power supply system, and judging whether to start the high-voltage power supply system or not according to the power load.
2. The electric vehicle power management method of claim 1, wherein the monitoring a first amount of stored power of a low voltage power supply system, and the determining whether to charge the low voltage power supply system based on the first amount of stored power comprises:
monitoring the duration of the vehicle in a flameout state;
monitoring a first stored electric quantity of the low-voltage power supply system when the duration that the vehicle is in a flameout state reaches a first set duration;
judging whether the first stored electric quantity is lower than a first set electric quantity;
and when the first stored electric quantity is lower than the first set electric quantity, starting the high-voltage power supply system to charge the low-voltage power supply system.
3. The method as claimed in claim 2, wherein the first stored electric quantity is detected by a low voltage battery sensor, the low voltage battery sensor is connected to a low voltage power supply control module, the low voltage power supply control module determines whether the first stored electric quantity is lower than the first set electric quantity, the low voltage power supply control module is connected to a high voltage battery management system, the low voltage power supply control module controls the high voltage battery management system to charge the low voltage power supply system, the low voltage power supply control module is connected to the intelligent terminal in a communication manner, and the low voltage power supply control module sends charging information of the low voltage power supply system to the intelligent terminal.
4. The electric vehicle power management method of claim 1, wherein the monitoring of the discharge current of the low-voltage power supply system and the determining of whether the vehicle has abnormal power consumption according to the discharge current comprises:
setting an abnormal electricity utilization current of the vehicle;
detecting the discharge current by the battery sensor;
and when the discharge current is larger than the abnormal electricity utilization current, sending reminding information to the intelligent terminal through the low-voltage power supply control module.
5. The electric vehicle power management method of claim 1, wherein the monitoring of whether the vehicle-mounted software is upgraded, and the determining whether to activate the high-voltage power supply system according to the software upgrade comprises:
receiving vehicle-mounted software upgrading information through a low-voltage power supply control module;
when the low-voltage power supply control module receives vehicle-mounted software upgrading information, the high-voltage power supply system is started to supply power to the vehicle-mounted software;
after the vehicle-mounted software is upgraded, the high-voltage power supply system is stopped;
and sending the upgrading progress of the vehicle-mounted software to an intelligent terminal in real time.
6. The electric vehicle power management method of claim 1, wherein monitoring a fault diagnosis duration of the vehicle, and determining whether to activate the high voltage power supply system according to the fault diagnosis duration comprises:
setting a second set time length;
when the fault diagnosis duration is shorter than the second set duration, the low-voltage power supply system supplies power to the fault diagnosis module;
and when the fault diagnosis duration is longer than the second set duration, starting the high-voltage power supply system to supply power to the diagnosis module.
7. The electric vehicle power management method according to claim 6, wherein when the high voltage power supply system fails to supply power to the fault diagnosis module, the first stored power is detected by a low voltage battery sensor, whether the first stored power is lower than a second set power is determined, if the first stored power is lower than the second set power, fault diagnosis is stopped, fault diagnosis stop information is sent to the intelligent terminal, and if the first stored power is higher than the second set power, the power required for residual diagnosis is calculated by a low voltage battery management system of the vehicle.
8. The electric vehicle power management method of claim 1, wherein the monitoring a second amount of stored power of the low voltage power supply system, and the determining whether to charge the low voltage power supply system based on the second amount of stored power comprises:
monitoring the second stored power of the low-voltage power supply system through a low-voltage battery sensor;
judging whether the second stored electric quantity is lower than a third set electric quantity;
when the second stored electric quantity is lower than the third set electric quantity, a low-voltage power supply control module sends a prompt of starting a high-voltage power supply system to a vehicle central control system and records a first prompt duration;
and if the first reminding time length exceeds a third set time length, the high-voltage power supply system is not started successfully, and the low-voltage power supply system is stopped.
9. The electric vehicle power management method of claim 1, wherein the monitoring of the electrical load of the low voltage power supply system, and the determining whether to enable the high voltage power supply system based on the electrical load comprises:
monitoring the power consumption of the low-voltage power supply system in unit time;
if the power consumption of the low-voltage power supply system in unit time is larger than the set power consumption, sending a prompt for starting the high-voltage power supply system to a vehicle central control system through a low-voltage power supply control module and recording a second prompt duration;
and if the second reminding time length exceeds a fourth set time length, the high-voltage power supply system is not started successfully, and the low-voltage power supply system is stopped.
10. The electric vehicle power management method according to claim 1, wherein a temperature of a low-voltage battery is monitored while the low-voltage power supply system is charged, and a charging voltage of the low-voltage power supply system is adjusted according to the temperature of the low-voltage battery.
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