CN113147503B - Power management method for electric vehicle - Google Patents
Power management method for electric vehicle Download PDFInfo
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- CN113147503B CN113147503B CN202110418967.1A CN202110418967A CN113147503B CN 113147503 B CN113147503 B CN 113147503B CN 202110418967 A CN202110418967 A CN 202110418967A CN 113147503 B CN113147503 B CN 113147503B
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- 238000007726 management method Methods 0.000 title claims abstract description 44
- 238000012544 monitoring process Methods 0.000 claims abstract description 54
- 238000003745 diagnosis Methods 0.000 claims abstract description 53
- 230000005611 electricity Effects 0.000 claims abstract description 31
- 230000002159 abnormal effect Effects 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004171 remote diagnosis Methods 0.000 description 2
- 230000007958 sleep Effects 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000012790 confirmation Methods 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
- 230000002950 deficient Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000012423 maintenance 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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 management method of an electric vehicle, which comprises the following steps: when the vehicle is in a parking state, monitoring a 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 abnormal electricity is used for the vehicle according to the discharge current; monitoring whether the vehicle-mounted software is subjected to software upgrading, and judging whether a high-voltage power supply system is started according to the software upgrading condition; monitoring the fault diagnosis duration of the 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 a 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 consumption load of the low-voltage power supply system, and judging whether the high-voltage power supply system is started or not according to the power consumption load; and the parking state and the driving state of the vehicle are respectively managed, so that a low-voltage power supply system of the vehicle is protected, and the product performance of the whole vehicle 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 initiatively enables a high-voltage power supply system to supply power to the whole vehicle and charge a storage battery when a user uses the vehicle, does not consider the conditions of using habit of the user, power consumption during remote operation (background OTA upgrading, remote diagnosis and remote operation of vehicle functions), abnormal power consumption after parking and the like, cannot meet the power consumption requirements of the whole vehicle in different states, and is poor in user experience. Meanwhile, the low-voltage storage battery can not be timely replenished after deep discharge, and the low-voltage storage battery can be deficient in electricity or service life is reduced due to crystallization of active substances, so that the performance of the whole vehicle product is affected.
Disclosure of Invention
The invention aims to provide a power management method for an electric vehicle, which aims at overcoming the defects in the prior art, respectively manages the parking state and the driving state of the vehicle, and respectively manages the conditions of charging of a low-voltage power supply system, abnormal power utilization of the vehicle, upgrading of vehicle-mounted software, fault diagnosis, power utilization load of the low-voltage power supply system and the like, thereby protecting the low-voltage power supply system of the vehicle and improving the product performance of the whole vehicle.
In order to achieve the above object, the present invention provides a power management method for an electric vehicle, comprising:
when a vehicle is in a parking state, monitoring a 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 abnormal electricity is used for the vehicle according to the discharge current; monitoring whether the vehicle-mounted software is subjected to software upgrading, and judging whether a high-voltage power supply system is started according to the software upgrading condition; monitoring a fault diagnosis duration of a vehicle, and judging whether to enable the high-voltage power supply system according to the fault diagnosis duration;
when the vehicle is in a driving state, monitoring a 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 consumption load of the low-voltage power supply system, and judging whether the high-voltage power supply system is started or not according to the power consumption load.
Optionally, the monitoring the first stored power of the low-voltage power supply system, and determining whether to charge the low-voltage power supply system according to the first stored power includes:
monitoring the duration of the vehicle in a flameout state;
when the time length of the vehicle in the flameout state reaches a first set time length, monitoring a first stored electric quantity of the low-voltage power supply system;
judging whether the first stored electric quantity is lower than a first set electric quantity or not;
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, the 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 judges whether the first stored electric quantity is lower than the 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 controls 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 an intelligent terminal, and the low-voltage power supply control module sends charging information of the low-voltage power supply system to the intelligent terminal.
Optionally, the monitoring the discharging current of the low-voltage power supply system, and determining whether abnormal electricity is generated in the vehicle according to the discharging current includes:
setting abnormal electricity utilization current of the vehicle;
detecting the discharge current by a battery sensor;
and when the discharging current is larger than the abnormal electricity consumption 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 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 deactivated;
and sending the upgrading progress of the vehicle-mounted software to the intelligent terminal in real time.
Optionally, the monitoring the fault diagnosis duration of the vehicle, and determining whether to enable 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 smaller 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 fault of the high-voltage power supply system cannot supply power to the fault diagnosis module, the first stored electric quantity is detected through a low-voltage battery sensor, whether the first stored electric quantity is lower than a second set electric quantity is judged, if the first stored electric quantity is lower than the second set electric quantity, fault diagnosis is stopped, fault diagnosis stopping information is sent to the intelligent terminal, and if the first stored electric quantity is higher than the second set electric quantity, the residual electric quantity required by diagnosis is calculated through a low-voltage battery management system of the vehicle.
Optionally, the monitoring the second stored power of the low-voltage power supply system, and determining whether to charge the low-voltage power supply system according to the second stored power includes:
monitoring the second stored power of the low voltage power supply system by a low voltage battery sensor;
judging whether the second stored electric quantity is lower than a third set electric quantity or not;
when the second stored electric quantity is lower than the third set electric quantity, sending a prompt for starting the high-voltage power supply system to the vehicle central control system through the low-voltage power supply control module and recording a first prompt duration;
and if the first reminding duration exceeds a third set duration, the high-voltage power supply system is not successfully started, and the low-voltage power supply system is stopped.
Optionally, the monitoring the power consumption load of the low-voltage power supply system, and determining whether to enable the high-voltage power supply system according to the power consumption load includes:
monitoring the electricity consumption of the low-voltage power supply system in unit time;
if the electricity consumption in the unit time of the low-voltage power supply system is larger than the set electricity consumption, sending a prompt for starting the high-voltage power supply system to the vehicle central control system through the 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 successfully started, 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 management method for an electric vehicle, which has the beneficial effects that:
1. the power management method is used for respectively managing the parking state and the driving state of the vehicle, respectively managing the conditions of charging of a low-voltage power supply system, abnormal power utilization of the vehicle, upgrading of vehicle-mounted software, fault diagnosis conditions, power utilization load of the low-voltage power supply system and the like, protecting the low-voltage power supply system of the vehicle and improving the product performance of the whole vehicle;
2. the power management method provides a more accurate charging control mode of the low-voltage power supply system, so that the charging of the low-voltage power supply system is 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 management method can send a prompt to the central control system of the vehicle, is beneficial to helping a user to develop good habit of using the vehicle, and protects the 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 foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a block diagram of a method of power management of an electric vehicle according to an embodiment of the invention.
Fig. 2 shows a block diagram of charging a low-voltage power supply system of a vehicle in a stopped state according to a power management method of an electric vehicle according to an embodiment of the present invention.
Fig. 3 shows a vehicle abnormal electricity usage determination block diagram of a power management method of an electric vehicle according to an embodiment of the present invention in a stopped state.
Fig. 4 shows a power supply block diagram for an on-board software upgrade of a vehicle of an electric vehicle power management method according to an embodiment of the present invention in a stopped state.
Fig. 5 shows a failure diagnosis power supply block diagram of a vehicle of an electric vehicle power supply management method according to an embodiment of the present invention in a stopped state.
Fig. 6 shows a charging block diagram of a low-voltage power supply system of a vehicle of an electric vehicle power management method according to an embodiment of the present invention in a driving state.
Fig. 7 shows a power supply block diagram of an electric vehicle in a driving state for an electric load according to a power supply management method of an electric vehicle 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 preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to 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 a 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 abnormal electricity is used for the vehicle according to the discharge current; monitoring whether the vehicle-mounted software is subjected to software upgrading, and judging whether a high-voltage power supply system is started according to the software upgrading condition; monitoring the fault diagnosis duration of the 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 a 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 consumption load of the low-voltage power supply system, and judging whether the high-voltage power supply system is started or not according to the power consumption load.
Specifically, referring to fig. 1, the power management method manages the parking state and the driving state of the vehicle respectively, and manages the conditions of charging of the low-voltage power supply system, abnormal power consumption of the vehicle, upgrading of vehicle-mounted software, fault diagnosis, power consumption load of the low-voltage power supply system and the like respectively, so as to protect the low-voltage power supply system of the vehicle and improve the product performance of the whole vehicle.
In this embodiment, monitoring a first stored power of the low-voltage power supply system, and determining whether to charge the low-voltage power supply system according to the first stored power includes:
monitoring the duration of the vehicle in a flameout state;
when the time length of the vehicle in the flameout state reaches a first set time length, monitoring a first stored electric quantity of the low-voltage power supply system;
judging whether the first stored electric quantity is lower than a first set electric quantity or not;
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 locks, the whole vehicle network enters a dormant state, the low-voltage power supply control module starts timing, after the dormant period exceeds 24 hours, the low-voltage battery sensor detects that the low-voltage battery of the low-voltage power supply system is lower than 55% (the freezing point critical state of the electrolyte of the lead-acid battery in the low-temperature environment is selected, the minimum electric quantity for starting and discharging the vehicle can be met at the moment), the low-voltage battery sensor sends a low-electric quantity wake-up signal to the low-voltage power supply control module through the LIN network, after the low-electric quantity wake-up signal is received by the low-voltage power supply control module, the high-voltage power supply system in the high-voltage battery management system sends a high-voltage request signal to the high-voltage Battery Management System (BMS), the high-voltage power supply system powers up the direct-current conversion controller (DC/DC) and charges the low-voltage battery, and when the low-voltage battery charges to 100%, the low-voltage battery stops charging and simultaneously sends a charging state to the user mobile phone through the background.
In this embodiment, the first stored electric quantity is detected by the low-voltage battery sensor, the low-voltage battery sensor is connected with the low-voltage power supply control module, the low-voltage power supply control module determines whether the first stored electric quantity is lower than a first set electric quantity, the low-voltage power supply control module is connected with the 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 with 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.
In this embodiment, the intelligent terminal is a user mobile phone.
In this embodiment, monitoring the discharge current of the low-voltage power supply system, and determining whether abnormal electricity is generated in the vehicle according to the discharge current includes:
setting abnormal electricity utilization current of the vehicle;
detecting discharge current by a low-voltage battery sensor;
when the discharging current is larger than the abnormal electricity consumption current, the reminding information is sent to the intelligent terminal through the low-voltage power supply control module.
Specifically, referring to fig. 3, after the whole vehicle sleeps, the low-voltage battery sensor monitors the discharge current of the low-voltage storage battery, if the discharge current is larger than the set abnormal electricity consumption current (different sleep currents set by different vehicle types), state information such as the discharge current value and duration time is recorded in real time, the cloud back stage carries out data recording, and meanwhile, the cloud back stage sends reminding information to a user mobile phone to remind the user of timely checking and maintenance.
In this embodiment, monitoring whether the vehicle-mounted software is subjected to software upgrade, and determining whether to enable the high-voltage power supply system according to the software upgrade 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 vehicle-mounted software upgrading information, the high-voltage power supply system is started to supply power to the vehicle-mounted software;
after the upgrading of the vehicle-mounted software is finished, 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 the cloud platform performs software push OTA upgrade on vehicle 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 whole vehicle through a direct current conversion controller, and after OTA upgrade and program verification are completed, the high-voltage power supply system is stopped to supply power, and the whole vehicle is dormant; and when OTA is upgraded, the software upgrading estimated time is sent to the mobile phone of the user for confirmation (the user cannot use the vehicle during upgrading, so that the user is ensured to upgrade when the user does not use the vehicle, the user is prevented from being influenced, and meanwhile, the user can check the upgrading state through the mobile phone APP in real time.
In the present embodiment, monitoring a failure diagnosis duration of a vehicle, determining whether to enable a high-voltage power supply system according to the failure diagnosis duration includes:
setting a second set time length;
when the fault diagnosis duration is smaller 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.
Specifically, referring to fig. 5, when the vehicle fails and needs remote fault diagnosis/data uploading, the low-voltage power supply control module counts the 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 diagnosis is finished, the power supply of the high-voltage power supply system is stopped, and the whole vehicle is dormant.
In this embodiment, when the fault of the high-voltage power supply system cannot supply power to the fault diagnosis module, the low-voltage battery sensor detects the first stored electric quantity, determines whether the first stored electric quantity is lower than the second set electric quantity, if the first stored electric quantity is lower than the second set electric quantity, stops fault diagnosis, and sends information for stopping fault diagnosis to the intelligent terminal, if the first stored electric quantity is higher than the second set electric quantity, the low-voltage battery management system of the vehicle calculates the residual electric quantity required by diagnosis.
Specifically, when the vehicle fails and needs remote fault diagnosis and data uploading, the low-voltage power supply control module counts the 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, and after diagnosis is finished, the power supply of the high-voltage power supply system is stopped, and the whole vehicle is dormant; if the high-voltage power supply system fails, when high-voltage power supply cannot be performed, the low-voltage power supply control module sets the second electric quantity to 80% according to the first storage electric quantity value fed back by the low-voltage battery sensor, when the first storage electric quantity value is not less than 80%, the low-voltage power supply system continues to perform fault diagnosis, when the first storage electric quantity value is less than 80%, the low-voltage battery management system calculates the electric quantity required by residual diagnosis, when the low-voltage power supply control module judges that the storage electric quantity of the low-voltage power supply system is consumed to 55%, normal fault diagnosis and data uploading can be ensured, and if normal fault diagnosis and data uploading cannot be ensured, the cloud back desk is informed to send information that remote diagnosis cannot be ensured for normal diagnosis/uploading due to insufficient electric quantity to a user mobile phone.
In this embodiment, monitoring the second stored power of the low-voltage power supply system, and determining whether to charge the low-voltage power supply system according to the second stored power includes:
monitoring a 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 or not;
when the second stored electric quantity is lower than the third set electric quantity, sending a prompt for starting the high-voltage power supply system to the vehicle central control system through the low-voltage power supply control module and recording a first prompting time;
if the first reminding duration exceeds the third setting, the long high-voltage power supply system is not successfully started, and the low-voltage power supply system is stopped.
Specifically, referring to fig. 6, when the ignition switch uses electricity in the ON/ACC gear, when the first stored electricity is lower than 75-80% (it is generally considered that the electricity of the lead-acid storage battery for the automobile is lower than 75-80% and the electricity is deeply consumed), the high-voltage power supply system is started and records the first reminding duration, the reminding instruction reminds "the electric quantity of the storage battery is low" in an instrument display reminding mode by the low-voltage power supply control module through the network, if the user does not start the operation of supplying electricity to the high-voltage power supply system after 2 minutes of reminding, the low-voltage power supply control module sends an instruction through the network to shut down the heavy-load electric appliance (such as an air conditioner, a heating function and the like), and then the power supply mode of the low-voltage power supply system is switched to the OFF gear so as to reduce the electricity consumption of the low-voltage system and ensure that the vehicle can be started normally.
In this embodiment, monitoring the power load of the low-voltage power supply system, and determining whether to enable the high-voltage power supply system according to the power load includes:
monitoring the electricity consumption in unit time of a low-voltage power supply system;
if the electricity consumption in the unit time of the low-voltage power supply system is larger than the set electricity consumption, sending a prompt for starting the high-voltage power supply system to the vehicle central control system through the low-voltage power supply control module and recording a second prompt duration;
if the second reminding time length exceeds the fourth setting time length, the high-voltage power supply system is not successfully started, and the low-voltage power supply system is stopped.
Specifically, referring to fig. 7, when the ignition switch is powered ON in the ON/ACC gear, the power consumption time of the low-voltage power supply system exceeds 30min (under the condition that the vehicle is normally used, the electric quantity of the low-voltage storage battery is generally kept at 80-100%, the electric current of the whole vehicle is larger during the ON/ACC of the vehicle, the power consumption of the low-voltage storage battery is fast, the power consumption of the low-voltage storage battery can be affected by the continuous power consumption of about 10-20% in 30min according to the different capacities of the low-voltage storage battery), the low-voltage power supply control module sends a warning to enable the high-voltage power supply system through a network and records a second warning duration, the warning command reminds "the power consumption of the electric quantity is excessive, the high-voltage is required to be started, or the system is closed within 2 min" after the warning occurs in a manner of sound and instrument display, if the user does not enable the operation of the high-voltage power supply system, the low-voltage power supply control module sends a command through the network, the high-load power consumption (such as functions of an air conditioner, heating and the like) are closed, and then the power supply mode of the low-voltage power supply system is switched to the OFF gear, so that the power consumption of the low-voltage power supply system can be normally started.
In this 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 storage battery for power is monitored through the low-voltage battery sensor, for example, the temperature exceeds 40 ℃ (generally, the temperature exceeds 50 ℃ in the interior, the water loss is increased, the internal resistance is increased, the negative electrode of the low-voltage storage battery is easy to sulfide and affects the service life, and the low-voltage storage battery is damaged), the low-voltage battery sensor sends a temperature signal to the low-voltage power supply control module through the LIN, the low-voltage power supply control module sends a signal to the high-voltage Battery Management System (BMS), the direct current conversion controller (DC/DC) is controlled to reduce the charging voltage to 13.8V, the low-voltage storage battery is reduced to generate heat, and the low-voltage storage battery is protected.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or 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 various embodiments described.
Claims (10)
1. A method of power management for an electric vehicle, comprising:
when a vehicle is in a parking state, monitoring a 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 abnormal electricity is used for the vehicle according to the discharge current; monitoring whether the vehicle-mounted software is subjected to software upgrading, and judging whether a high-voltage power supply system is started according to the software upgrading condition; monitoring a fault diagnosis duration of a vehicle, and judging whether to enable the high-voltage power supply system according to the fault diagnosis duration;
when the vehicle is in a driving state, monitoring a 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 consumption load of the low-voltage power supply system, and judging whether the high-voltage power supply system is started or not according to the power consumption load.
2. The method of claim 1, wherein monitoring a first stored power of a low voltage power supply system, and determining whether to charge the low voltage power supply system based on the first stored power comprises:
monitoring the duration of the vehicle in a flameout state;
when the time length of the vehicle in the flameout state reaches a first set time length, monitoring a first stored electric quantity of the low-voltage power supply system;
judging whether the first stored electric quantity is lower than a first set electric quantity or not;
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 electric vehicle power management method according to claim 2, wherein the 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 judges whether the first stored electric quantity is lower than the 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 controls 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 an intelligent terminal, and charging information of the low-voltage power supply system is sent to the intelligent terminal by the low-voltage power supply control module.
4. The method of claim 1, wherein monitoring the discharge current of the low voltage power supply system, and determining whether abnormal electricity is present in the vehicle based on the discharge current comprises:
setting abnormal electricity utilization current of the vehicle;
detecting the discharge current by a battery sensor;
and when the discharging current is larger than the abnormal electricity consumption current, sending reminding information to the intelligent terminal through the low-voltage power supply control module.
5. The method of claim 1, wherein monitoring whether the on-board software is software upgraded, and determining whether to enable the high voltage power supply system based on 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 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 deactivated;
and sending the upgrading progress of the vehicle-mounted software to the intelligent terminal in real time.
6. The electric vehicle power management method of claim 1, wherein the monitoring of a fault diagnosis duration of a vehicle, and determining whether to enable the high voltage power supply system based on the fault diagnosis duration comprises:
setting a second set time length;
when the fault diagnosis duration is smaller 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 method according to claim 6, wherein when the high voltage power supply system fails to supply power to the failure 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, failure diagnosis is stopped, failure diagnosis stopping information is sent to an intelligent terminal, and if the first stored power is higher than the second set power, remaining diagnosis required power 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 stored power of the low voltage power supply system, and determining whether to charge the low voltage power supply system based on the second stored power comprises:
monitoring the second stored power of the low voltage power supply system by a low voltage battery sensor;
judging whether the second stored electric quantity is lower than a third set electric quantity or not;
when the second stored electric quantity is lower than the third set electric quantity, sending a prompt for starting the high-voltage power supply system to the vehicle central control system through the low-voltage power supply control module and recording a first prompt duration;
and if the first reminding duration exceeds a third set duration, the high-voltage power supply system is not successfully started, and the low-voltage power supply system is stopped.
9. The electric vehicle power management method of claim 1, wherein the monitoring the electrical load of the low voltage power supply system, and determining whether to enable the high voltage power supply system based on the electrical load comprises:
monitoring the electricity consumption of the low-voltage power supply system in unit time;
if the electricity consumption in the unit time of the low-voltage power supply system is larger than the set electricity consumption, sending a prompt for starting the high-voltage power supply system to the vehicle central control system through the 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 successfully started, and the low-voltage power supply system is stopped.
10. The electric vehicle power management method according to claim 1, characterized in that the temperature of a low-voltage battery is monitored while charging the low-voltage power supply system, and the charging voltage of the low-voltage power supply system is adjusted according to the temperature of the low-voltage battery.
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