CN113910910B - Electric automobile low-voltage power supply supplementing method, device, equipment and storage medium - Google Patents
Electric automobile low-voltage power supply supplementing method, device, equipment and storage medium Download PDFInfo
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- CN113910910B CN113910910B CN202111246817.3A CN202111246817A CN113910910B CN 113910910 B CN113910910 B CN 113910910B CN 202111246817 A CN202111246817 A CN 202111246817A CN 113910910 B CN113910910 B CN 113910910B
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- 230000001502 supplementing effect Effects 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000010354 integration Effects 0.000 claims abstract description 12
- 238000004590 computer program Methods 0.000 claims description 25
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims 2
- 238000004904 shortening Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 230000006870 function Effects 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
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- 239000013589 supplement Substances 0.000 description 3
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- 230000008030 elimination Effects 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0038—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
According to the electric vehicle low-voltage power supply supplementing method, device, equipment and storage medium provided by the embodiment of the invention, the whole vehicle controller is switched from a dormant state to a working state by responding to a wake-up instruction; when the preset power supply condition is met, controlling the power supply of the low-voltage power supply; when the low-voltage power supply sensor is detected to be in a normal working state, acquiring the current electric quantity state of the low-voltage power supply detected by the low-voltage power supply sensor; when the current electric quantity state meets the preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value, controlling the low-voltage power supply to exit the power supply; when the current electric quantity state does not meet the electric quantity state adoption condition, calculating charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method; and when the charging electric quantity information is larger than or equal to a preset high electric quantity information threshold value, controlling the low-voltage power supply to exit the power supplementing operation. The invention can stop supplying power to the low-voltage power supply in time, and reduce the risk of shortening the service life caused by excessive power supply of the low-voltage power supply.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a method, a device, equipment and a storage medium for supplementing power to a low-voltage power supply of an electric automobile.
Background
The current situation of shortage of global petroleum resources and serious environmental pollution promotes the development of electric automobiles with the advantages of economy, energy conservation, environmental protection and the like. More and more electronic devices are used on the electric automobile, particularly, under the parking scene, functions such as a vehicle-mounted refrigerator, a sentry mode and a pet mode are relevant working scenes, and the working scenes increase energy consumption of a low-voltage power supply, so that the low-voltage power supply is required to be frequently supplemented with electricity, and if the low-voltage power supply is excessively charged for a long time, the performance of the low-voltage power supply is reduced, and the service life of the low-voltage power supply is greatly shortened.
When charging low-voltage power supply, the prior art adopts a battery management system (Battery Management System, BMS) to monitor the low-voltage power supply so as to stop supplying power after the low-voltage power supply is fully charged, but the single monitoring mode easily leads to excessive power supply of the low-voltage power supply when the BMS is abnormal, so that the state of the low-voltage power supply is monitored in a matched mode by a plurality of monitoring modes, and the low-voltage power supply is stopped in time.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for supplementing power to a low-voltage power supply of an electric automobile, which can monitor the state of the low-voltage power supply in a power supplementing state in various modes, stop supplementing power to the low-voltage power supply in time and reduce the risk of shortening the service life caused by excessive power supplement of the low-voltage power supply.
In order to achieve the above object, an embodiment of the present invention provides a method for supplementing power to a low-voltage power supply of an electric vehicle, including:
responding to a wake-up instruction, and switching the whole vehicle controller from a dormant state to a working state according to the wake-up instruction;
when the condition of the preset power supply is detected to be met, controlling the low-voltage power supply to perform the power supply operation; the low voltage power supply may be a battery;
when the power supply sensor is detected to be in a normal working state, acquiring the current electric quantity state of the low-voltage power supply detected by the power supply sensor; the power sensor may be a battery sensor.
When the current electric quantity state meets a preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value, controlling the low-voltage power supply to exit the power supplementing operation;
when the current electric quantity state does not meet the electric quantity state adoption condition, calculating charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method;
and when the charging electric quantity information is larger than or equal to a preset high electric quantity information threshold value, controlling the low-voltage power supply to exit the power supplementing operation.
As an improvement of the above solution, after the power supply operation is performed on the control low-voltage power supply, the method further includes:
when the power supply sensor is detected to be in a fault state, detecting the output current of the direct current-direct current converter;
and when the output current is equal to the consumption current of the preset low-voltage electric appliance in the vehicle, controlling the low-voltage electric appliance to exit the power supplementing operation.
As an improvement of the above scheme, the power supplementing condition is as follows:
the current electric quantity state meets the electric quantity state adoption condition, and is smaller than a preset low electric quantity state threshold value;
or detecting that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value.
As an improvement of the above solution, the electric quantity state adoption condition specifically includes:
and the current electric quantity state is an effective value, and the error electric quantity state identification information sent by the power supply sensor is not received.
As an improvement of the above solution, the wake-up instruction includes at least one of a first wake-up instruction and a second wake-up instruction; the generation mode of the first wake-up instruction is as follows:
when the power supply sensor detects that the current electric quantity state of the low-voltage power supply is smaller than a preset low-electric quantity state threshold value, a first wake-up instruction is generated;
the second wake-up instruction is generated in the following manner:
and when the battery management system detects that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value, generating a second wake-up instruction.
As an improvement of the above solution, when the satisfaction of the preset power-up condition is detected, the method further includes:
when detecting that the power-on related controller has a fault, controlling the power-on related controller to enter a self-checking mode to generate fault report information; the power supply related controller at least comprises the whole vehicle controller.
As an improvement of the above solution, the method further includes: when the whole vehicle controller cannot be switched from a dormant state to a working state according to the awakening instruction, the vehicle-mounted terminal detects the terminal voltage of the low-voltage power supply, and when the terminal voltage is smaller than a preset fault voltage threshold value, the power-supplementing related controller is controlled to enter a self-checking mode to generate fault report information; wherein, the power supply related controller at least comprises the power supply sensor.
As an improvement of the above solution, when it is detected that the preset power supply condition is met, the method further includes:
when the vehicle is detected to be charged and the current electric quantity state of the low-voltage power supply is smaller than the full-load electric quantity, the low-voltage power supply is automatically supplemented to the full-load electric quantity, and the vehicle exits from the full-load electric quantity after the low-voltage power supply is full.
In order to achieve the above object, an embodiment of the present invention further provides an electric vehicle low-voltage power supply device, including:
the state switching module is used for responding to the wake-up instruction and switching the whole vehicle controller from the dormant state to the working state according to the wake-up instruction;
the power supply module is used for controlling the low-voltage power supply to perform power supply operation when the fact that the preset power supply condition is met is detected;
the power supply sensor is used for detecting the power supply state of the low-voltage power supply;
the first power supply exiting module is used for controlling the low-voltage power supply to exit the power supply operation when the current electric quantity state meets the preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value;
the electric quantity information calculation module is used for calculating the charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method when the current electric quantity state does not meet the electric quantity state adoption condition;
and the second power supplementing and exiting module is also used for controlling the low-voltage power supply to exit the power supplementing operation when the charging electric quantity information is larger than or equal to a preset high electric quantity information threshold value.
In order to achieve the above object, an embodiment of the present invention further provides an electric vehicle low-voltage power supply device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor executes the computer program to implement the electric vehicle low-voltage power supply method according to any one of the embodiments.
In order to achieve the above object, an embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, and when the computer program runs, controls a device where the computer readable storage medium is located to execute the electric automobile power supply method according to any one of the embodiments.
Compared with the prior art, the electric vehicle low-voltage power supply supplementing method, the electric vehicle low-voltage power supply supplementing device, the electric vehicle low-voltage power supply supplementing equipment and the storage medium provided by the embodiment of the invention switch the whole vehicle controller from the dormant state to the working state by responding to the awakening instruction; when the condition of the preset power supply is detected to be met, controlling the low-voltage power supply to perform the power supply operation; when the power supply sensor is detected to be in a normal working state, acquiring the current electric quantity state of the low-voltage power supply detected by the power supply sensor; when the current electric quantity state meets a preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value, controlling the low-voltage power supply to exit the power supplementing operation; when the current electric quantity state does not meet the electric quantity state adoption condition, calculating charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method; and when the charging electric quantity information is larger than or equal to a preset high electric quantity information threshold value, controlling the low-voltage power supply to exit the power supplementing operation. According to the embodiment of the invention, the state of the low-voltage power supply in the power supply state is monitored in various modes, so that the power supply of the low-voltage power supply is stopped in time, and the risk of shortening the service life caused by excessive power supply of the low-voltage power supply is reduced.
Drawings
Fig. 1 is a flowchart of a method for supplementing power to a low-voltage power supply of an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a flowchart of another method for supplementing power to a low-voltage power supply of an electric vehicle according to an embodiment of the present invention;
fig. 3 is a block diagram of a power supply device for a low-voltage power supply of an electric vehicle according to an embodiment of the present invention;
fig. 4 is a block diagram of a power supply device for an electric vehicle according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flowchart of a method for supplementing power to a low-voltage power supply of an electric automobile is provided in an embodiment of the invention.
The power supplementing method for the electric automobile low-voltage power source (such as a storage battery) provided by the embodiment of the invention comprises the following steps of S11-S16:
s11, responding to a wake-up instruction, and switching the whole vehicle controller from a dormant state to a working state according to the wake-up instruction;
s12, when the fact that the preset power supply condition is met is detected, controlling the low-voltage power supply to perform power supply operation;
s13, when the power supply sensor (such as a battery sensor) is detected to be in a normal working state, acquiring the current electric quantity state of the low-voltage power supply detected by the power supply sensor;
s14, when the current electric quantity state meets a preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value, controlling the low-voltage power supply to exit the power supplementing operation;
s15, when the current electric quantity state does not meet the electric quantity state adoption condition, calculating charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method;
and S16, when the charging electric quantity information is larger than or equal to a preset high electric quantity information threshold value, controlling the low-voltage power supply to exit the power supplementing operation.
It is worth to describe that the embodiment of the invention is suitable for electric vehicles, wherein the electric vehicles comprise a high-voltage electric system and a low-voltage electric system, the high-voltage electric system comprises a power battery, the power battery is used for driving high-power equipment such as an automobile motor, and the like, and the low-voltage electric system comprises an automobile storage battery. The working voltage of the low-voltage power supply is generally 12V, and the low-voltage power supply is generally used for low-voltage electric appliances of automobiles, such as automobile door switches, remote control keys, automobile lamps, windshield wipers and the like; alternatively, the power can be supplemented to the low-voltage power supply through the dynamic power, and the power can also be supplemented to the low-voltage power supply through an external charging device.
The electric automobile low-voltage power supply method of the embodiment of the invention CAN be executed by an entire automobile controller (Vehicle Control Unit, VCU), and the VCU and the power supply sensor (Electronic Battery Sensor, EBS) communicate through a LIN bus or a CAN bus.
When the VCU is in the dormant state, the VCU can be awakened through an awakening instruction, and the VCU is switched from the dormant state to the working state; when the preset power supplementing condition is detected to be met, controlling the power battery to supplement power for the low-voltage power supply through the direct current-direct current converter or controlling the external charging equipment to supplement power for the low-voltage power supply; in the power supplementing process, the relevant State of the low-voltage power supply needs to be monitored so as to stop the power supplementing operation in time after the low-voltage power supply is fully charged, when the EBS is detected to be in a normal working State, the current electric quantity State of the low-voltage power supply detected by the EBS is obtained, wherein when an EBS device is not damaged and the LIN/CAN communication of the VCU and the EBS is not faulty, the EBS is judged to be in the normal working State, and the current electric quantity State CAN be the current battery State of Charge (SOC) of the low-voltage power supply.
Because the current electric quantity state obtained by EBS detection is inaccurate even if the EBS is in a normal working state, in order to more accurately determine the time of the power-up exit, the current electric quantity state needs to be accurately judged, and when the current electric quantity state meets the preset electric quantity state adoption condition, the current electric quantity state is accurately judged; under the condition that the current electric quantity state is accurate, when the current electric quantity state is larger than or equal to a preset high electric quantity information threshold value, controlling the direct current-direct current converter to stop supplying power to the low-voltage power supply, and exiting the power supplying operation; when the current electric quantity state does not meet the preset electric quantity state adoption condition, the current electric quantity state is judged to be inaccurate, at the moment, the VUC calculates the charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method, when the charging electric quantity information is larger than or equal to a preset high-electric quantity information threshold value, the low-voltage power supply is controlled to exit the power supplementing operation, the state of the low-voltage power supply in the power supplementing state is monitored in a plurality of modes, the power supplementing of the low-voltage power supply can be timely stopped, and the risk of shortening the service life caused by excessive power supplementing of the low-voltage power supply is reduced.
In one embodiment, after the power supply operation is performed by controlling the low-voltage power supply in step S12, steps S121 to S122 are further included:
s121, detecting output current of the direct current-direct current converter when the power supply sensor is detected to be in a fault state;
and S122, when the output current is equal to the consumption current of the preset low-voltage electric appliance in the vehicle, controlling the low-voltage electric appliance to exit the power supplementing operation.
Specifically, when the damage of the EBS device is detected, or the LIN/CAN communication of the EBS and the VCU fails, the EBS is judged to be in a failure state; detecting the output current of a direct current-direct current converter and detecting the consumption current of a low-voltage electric appliance in a vehicle; comparing the output current with the consumption current; because the output current is used for supplementing the low-voltage power supply, the current consumed by the low-voltage electric appliance in the vehicle when in operation is provided by the low-voltage power supply, when the output current is equal to the consumed current, the output current is indicated to be used for the low-voltage electric appliance in the vehicle, and the low-voltage power supply is fully charged, so that the low-voltage power supply is controlled to exit from the power supplementing operation, and the service life of the low-voltage power supply is prevented from being shortened due to excessive power supplementing.
In one embodiment, the power up condition in step S12 is:
the current electric quantity state meets the electric quantity state adoption condition, and is smaller than a preset low electric quantity state threshold value;
or detecting that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value.
For example, the current state of charge is set to be SOC, the low state of charge threshold is set to be 20%, i.e., the power up condition is SOC less than 20%, or the terminal voltage of the low voltage power supply is detected to be less than a preset low voltage threshold.
It will be appreciated that the low state of charge threshold and the low voltage threshold are corresponding, i.e. when the current state of charge of the low voltage power supply is equal to the low state of charge threshold, the terminal voltage of the low voltage power supply is equal to the low voltage threshold.
In one embodiment, the condition for the state of charge in step S14 specifically includes:
and the current electric quantity state is an effective value, and the error electric quantity state identification information sent by the power supply sensor is not received.
It should be noted that, the current electric quantity state may be an SOC, and the erroneous electric quantity state identification information is erroneous SOC identification information; the normal value range of the SOC is 0-100%, when the value of the SOC is within the normal value range, the SOC is an effective value, and when the value of the SOC is not within the normal range, the SOC is an ineffective value; when the SOC calculated by the EBS is wrong, wrong SOC identification information is sent to the VCU, and when the wrong SOC identification information is received by the VCU, the received SOC sent by the EBS is abandoned. When the SOC is an invalid value or the VCU receives the wrong SOC identification information, the SOC is discarded.
In one embodiment, the wake-up instruction in step S11 includes at least one of a first wake-up instruction and a second wake-up instruction; the generation mode of the first wake-up instruction is as follows:
when the power supply sensor detects that the current electric quantity state of the low-voltage power supply is smaller than a preset low-electric quantity state threshold value, a first wake-up instruction is generated;
the second wake-up instruction is generated in the following manner:
and when the battery management system detects that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value, generating a second wake-up instruction.
It should be noted that when the VCU is dormant, the EBS or battery management system (Battery Management System, BMS) monitors the low voltage power source either periodically or non-periodically to wake up the VCU in time when the low voltage power source is low.
For example, the current state of charge is set as SOC, the low state of charge threshold is 20%, and the VCU wakes up by: when the EBS detects that the SOC of the low-voltage power supply is less than 20%, a first wake-up instruction is generated and sent to the VCU to wake up the VCU; or when the BMS detects that the terminal voltage of the low-voltage power supply is smaller than the low-voltage threshold value, generating a second wake-up instruction and sending the second wake-up instruction to the VCU.
It can be understood that EBS and BMS can monitor low voltage power supply simultaneously, through adopting the state of multiple monitoring mode cooperation monitoring low voltage power supply, can in time discover low voltage power supply not enough, avoid low voltage power supply to mend the electric untimely to lead to whole car unable high voltage and shortened low voltage power supply's life-span's condition to appear greatly.
In one embodiment, after detecting that the preset power-up condition is met in step S12, the method further includes step S120:
s120, when detecting that the power-on related controller has a fault, controlling the power-on related controller to enter a self-checking mode to generate fault report information; the power supply related controller at least comprises the whole vehicle controller.
Specifically, after a preset power supplementing condition is detected to be met, if no power supplementing is carried out on the low-voltage power supply, the power supplementing related controller is controlled to enter a self-checking mode to generate fault report information, the fault report information is uploaded to a cloud platform, the whole vehicle is controlled to enter a low-power consumption dormant state, and a power shortage early warning prompt is generated; wherein the power-up related controller comprises at least one of a VCU and a DC-DC converter.
It can be appreciated that the after-sale service center of the vehicle can perform fault elimination for the vehicle, prepare accessories of fault parts and provide power-on service for the vehicle in time through fault report information uploaded to the cloud platform.
In one embodiment, the method further comprises step S17:
s17, when the whole vehicle controller cannot be switched from a dormant state to a working state according to the wake-up instruction, the vehicle-mounted terminal detects the terminal voltage of the low-voltage power supply, and when the terminal voltage is lower than a preset fault voltage threshold value, the power-up related controller is controlled to enter a self-checking mode to generate fault report information; wherein, the power supply related controller at least comprises the power supply sensor.
Further, the fault voltage threshold is less than the low voltage threshold.
It can be understood that when the vehicle-mounted terminal (Tbox) detects that the voltage of the low-voltage power supply terminal is smaller than the fault voltage threshold, the VCU has received the wake-up instruction sent by the EBS or the BMS and switched from the sleep state to the working state under normal conditions, but if a situation that the VCU has not been woken up yet occurs at this time, which indicates that the VCU has woken up to fail, the power-up related controller needs to be controlled to enter a self-checking mode to generate fault report information; wherein, the power supply related controller at least comprises at least one of a power supply sensor and a BMS.
It should be noted that, in the whole power supply process of the low-voltage power supply, if a related controller has a fault condition, self-checking is required to be performed to generate fault report information and upload the fault report information to a cloud end so as to facilitate a vehicle owner and maintenance personnel to perform fault investigation.
It should be noted that, the foregoing process of supplementing power to the power source of the electric automobile may also refer to fig. 2.
According to the electric vehicle low-voltage power supply method provided by the embodiment of the invention, the whole vehicle controller is switched from the dormant state to the working state by responding to the wake-up instruction; when the condition of the preset power supply is detected to be met, controlling the low-voltage power supply to perform the power supply operation; when the power supply sensor is detected to be in a normal working state, acquiring the current electric quantity state of the low-voltage power supply detected by the power supply sensor; when the current electric quantity state meets a preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value, controlling the low-voltage power supply to exit the power supplementing operation; when the current electric quantity state does not meet the electric quantity state adoption condition, calculating charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method; and when the charging electric quantity information is larger than or equal to a preset high electric quantity information threshold value, controlling the low-voltage power supply to exit the power supplementing operation. Therefore, the embodiment of the invention monitors the state of the low-voltage power supply in the power supply state in various modes, and stops supplying power to the low-voltage power supply in time, so that the risk of shortening the service life caused by excessive power supply of the low-voltage power supply is reduced.
As an improvement of the above solution, when it is detected that the low-voltage power supply meets a preset power supply condition, the method further includes:
when the vehicle is detected to be charged and the current electric quantity state of the low-voltage power supply is smaller than the full-load electric quantity, the voltage power supply is automatically charged to the full-load electric quantity, and the vehicle exits from the charging after the full-load electric quantity of the low-voltage power supply.
Referring to fig. 3, which is a block diagram of a power supply device for an electric vehicle and a power supply device for an electric vehicle 10 according to an embodiment of the present invention, the power supply device for an electric vehicle includes:
the state switching module 11 is used for responding to a wake-up instruction and switching the whole vehicle controller from a dormant state to a working state according to the wake-up instruction;
the power supply module 12 is used for controlling the power supply operation of the low-voltage power supply when the preset power supply condition is detected to be met;
the electric quantity state acquisition module 13 is used for acquiring the current electric quantity state of the low-voltage power supply detected by the power supply sensor when the power supply sensor is detected to be in a normal working state;
the first power-up exit module 14 is configured to control the low-voltage power supply to exit the power-up operation when the current electric quantity state meets a preset electric quantity state adoption condition and the current electric quantity state is greater than or equal to a preset high electric quantity state threshold;
the electric quantity information calculation module 15 is used for calculating the charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method when the current electric quantity state does not meet the electric quantity state adoption condition;
the second power-up exit module 16 is further configured to control the low-voltage power supply to exit the power-up operation when the charging power information is greater than or equal to a preset high-power information threshold.
Specifically, when the VCU is in the sleep state, the VCU may be awakened by an awakening instruction, and the VCU is switched from the sleep state to the working state; when the condition of the preset power supply is detected to be met, controlling the power battery to supply power to the low-voltage power supply through the direct current-direct current converter; in the power supplementing process, the relevant State of the low-voltage power supply needs to be monitored so as to stop the power supplementing operation in time after the low-voltage power supply is fully charged, and when the EBS is detected to be in a normal working State, the current electric quantity State of the low-voltage power supply detected by the EBS is obtained, wherein when an EBS device is not damaged and the LIN communication between the VCU and the EBS is not failed, the EBS is judged to be in the normal working State, and the current electric quantity State can be the current battery Charge State (SOC) of the low-voltage power supply; because the current electric quantity state obtained by EBS detection is inaccurate even if the EBS is in a normal working state, in order to more accurately determine the time of the power-up exit, the current electric quantity state needs to be accurately judged, and when the current electric quantity state meets the preset electric quantity state adoption condition, the current electric quantity state is accurately judged; under the condition that the current electric quantity state is accurate, when the current electric quantity state is larger than or equal to a preset high electric quantity information threshold value, controlling the direct current-direct current converter to stop supplying power to the low-voltage power supply, and exiting the power supplying operation; when the current electric quantity state does not meet the preset electric quantity state adoption condition, the current electric quantity state is judged to be inaccurate, at the moment, the VUC calculates the charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method, when the charging electric quantity information is larger than or equal to a preset high-electric quantity information threshold value, the low-voltage power supply is controlled to exit the power supplementing operation, the state of the low-voltage power supply in the power supplementing state is monitored in a plurality of modes, the power supplementing of the low-voltage power supply can be timely stopped, and the risk of shortening the service life caused by excessive power supplementing of the low-voltage power supply is reduced.
In one embodiment, the method further comprises:
the output current acquisition module is used for detecting the output current of the direct current-direct current converter when the power supply sensor is detected to be in a fault state;
and the third power supply exiting module is used for controlling the power supply operation to be exited when the output current is equal to the consumption current of the preset low-voltage electric appliance in the vehicle.
Specifically, when the damage of the EBS device itself is detected, or the LIN communication of the EBS and the VCU fails, the EBS is judged to be in a failure state; detecting the output current of a direct current-direct current converter and detecting the consumption current of a low-voltage electric appliance in a vehicle; comparing the output current with the consumption current; because the output current is used for supplementing the low-voltage power supply, the current consumed by the low-voltage electric appliance in the vehicle when in operation is provided by the low-voltage power supply, when the output current is equal to the consumed current, the output current is indicated to be used for the low-voltage electric appliance in the vehicle, and the low-voltage power supply is fully charged, so that the low-voltage power supply is controlled to exit from the power supplementing operation, and the service life of the low-voltage power supply is prevented from being shortened due to excessive power supplementing.
In one embodiment, the power up condition is:
the current electric quantity state meets the electric quantity state adoption condition, and is smaller than a preset low electric quantity state threshold value;
or detecting that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value.
For example, the current state of charge is set to be SOC, the low state of charge threshold is set to be 20%, i.e., the power up condition is SOC less than 20%, or the terminal voltage of the low voltage power supply is detected to be less than a preset low voltage threshold.
It will be appreciated that the low state of charge threshold and the low voltage threshold are corresponding, i.e. when the current state of charge of the low voltage power supply is equal to the low state of charge threshold, the terminal voltage of the low voltage power supply is equal to the low voltage threshold.
In one embodiment, the state of charge adoption condition specifically includes:
and the current electric quantity state is an effective value, and the error electric quantity state identification information sent by the power supply sensor is not received.
It should be noted that, the current electric quantity state may be an SOC, and the erroneous electric quantity state identification information is erroneous SOC identification information; the normal value range of the SOC is 0-100%, when the value of the SOC is within the normal value range, the SOC is an effective value, and when the value of the SOC is not within the normal range, the SOC is an ineffective value; when the SOC calculated by the EBS is wrong, wrong SOC identification information is sent to the VCU, and when the wrong SOC identification information is received by the VCU, the received SOC sent by the EBS is abandoned. When the SOC is an invalid value or the VCU receives the wrong SOC identification information, the SOC is discarded.
In one embodiment, the wake instruction includes at least one of a first wake instruction and a second wake instruction; then, the electric automobile low-voltage power supply supplementing device 10 further includes:
the first wake-up instruction generation module is used for generating a first wake-up instruction when the power supply sensor detects that the current electric quantity state of the low-voltage power supply is smaller than a preset low-electric quantity state threshold value;
and the second wake-up instruction generating module is used for generating a second wake-up instruction when the battery management system detects that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value.
It should be noted that when the VCU is dormant, the EBS or battery management system (Battery Management System, BMS) monitors the low voltage power source either periodically or non-periodically to wake up the VCU in time when the low voltage power source is low.
For example, the current state of charge is set as SOC, the low state of charge threshold is 20%, and the VCU wakes up by: when the EBS detects that the SOC of the low-voltage power supply is less than 20%, a first wake-up instruction is generated and sent to the VCU to wake up the VCU; or when the BMS detects that the terminal voltage of the low-voltage power supply is smaller than the low-voltage threshold value, generating a second wake-up instruction and sending the second wake-up instruction to the VCU.
It can be understood that EBS and BMS can monitor low voltage power supply simultaneously, through adopting the state of multiple monitoring mode cooperation monitoring low voltage power supply, can in time discover low voltage power supply not enough, avoid low voltage power supply to mend the electric untimely to lead to whole car unable high voltage and shortened low voltage power supply's life-span's condition to appear greatly.
In one embodiment, the electric vehicle low-voltage power supply supplementing device 10 further includes: the first fault information generation module is used for controlling the power-on related controller to enter a self-checking mode to generate fault report information when detecting that the power-on related controller has faults; the power supply related controller at least comprises the whole vehicle controller.
Specifically, after a preset power supplementing condition is detected to be met, if no power supplementing is carried out on the low-voltage power supply, the power supplementing related controller is controlled to enter a self-checking mode to generate fault report information, the fault report information is uploaded to a cloud platform, the whole vehicle is controlled to enter a low-power consumption dormant state, and a power shortage early warning prompt is generated; wherein the power-up related controller comprises at least one of a VCU and a DC-DC converter.
It can be appreciated that the after-sale service center of the vehicle can perform fault elimination for the vehicle, prepare accessories of fault parts and provide power-on service for the vehicle in time through fault report information uploaded to the cloud platform.
In one embodiment, the method further comprises: the second fault information generation module is used for detecting the terminal voltage of the low-voltage power supply by the vehicle-mounted terminal when the whole vehicle controller cannot be switched from the sleep state to the working state according to the wake-up instruction, and controlling the power-up related controller to enter a self-checking mode to generate fault report information when the terminal voltage is smaller than a preset fault voltage threshold value; wherein, the power supply related controller at least comprises the power supply sensor.
It should be noted that, the working process of the electric vehicle low-voltage power supply device 10 may refer to the working process of the electric vehicle low-voltage power supply method in the above embodiment, and will not be described herein.
Further, the fault voltage threshold is less than the low voltage threshold.
It can be understood that when the vehicle-mounted terminal (Tbox) detects that the voltage of the low-voltage power supply terminal is smaller than the fault voltage threshold, the VCU has received the wake-up instruction sent by the EBS or the BMS and switched from the sleep state to the working state under normal conditions, but if a situation that the VCU has not been woken up yet occurs at this time, which indicates that the VCU has woken up to fail, the power-up related controller needs to be controlled to enter a self-checking mode to generate fault report information; wherein, the power supply related controller at least comprises at least one of a power supply sensor and a BMS.
It should be noted that, in the whole power supply process of the low-voltage power supply, if a related controller has a fault condition, self-checking is required to be performed to generate fault report information and upload the fault report information to a cloud end so as to facilitate a vehicle owner and maintenance personnel to perform fault investigation.
Referring to fig. 4, an electric vehicle low-voltage power supply device 30 according to an embodiment of the present invention includes a processor 31, a memory 32, and a computer program stored in the memory 32 and configured to be executed by the processor 31, where the steps in the embodiment of the electric vehicle low-voltage power supply method described above, such as steps S11 to S16 described in fig. 1, are implemented when the processor 31 executes the computer program; alternatively, the processor 31 may implement the functions of the modules in the above-described device embodiments, such as the state switching module 11, when executing the computer program.
Illustratively, the computer program may be split into one or more modules that are stored in the memory 32 and executed by the processor 31 to perform the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions describing the execution of the computer program in the electric vehicle low-voltage power supply device 30. For example, the computer program may be divided into a state switching module 11, a power supplementing module 12, a power status obtaining module 13, a first power supplementing exiting module 14, a power information calculating module 15 and a second power supplementing exiting module 16, where the specific functions of the modules are as follows:
the state switching module 11 is used for responding to a wake-up instruction and switching the whole vehicle controller from a dormant state to a working state according to the wake-up instruction;
the power supply module 12 is used for controlling the power supply operation of the low-voltage power supply when the preset power supply condition is detected to be met;
the electric quantity state acquisition module 13 is used for acquiring the current electric quantity state of the low-voltage power supply detected by the power supply sensor when the power supply sensor is detected to be in a normal working state;
the first power-up exit module 14 is configured to control the low-voltage power supply to exit the power-up operation when the current electric quantity state meets a preset electric quantity state adoption condition and the current electric quantity state is greater than or equal to a preset high electric quantity state threshold;
the electric quantity information calculation module 15 is used for calculating the charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method when the current electric quantity state does not meet the electric quantity state adoption condition;
the second power-up exit module 16 is further configured to control the low-voltage power supply to exit the power-up operation when the charging power information is greater than or equal to a preset high-power information threshold.
The specific working process of each module may refer to the working process of the electric vehicle low-voltage power supply device 10 described in the foregoing embodiment, and will not be described herein.
The electric automobile low-voltage power supply device 30 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The electric vehicle low-voltage power supply device 30 may include, but is not limited to, a processor 31 and a memory 32. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of an electric vehicle low-voltage power supply device, and does not constitute a limitation of the electric vehicle low-voltage power supply device 30, and may include more or fewer components than illustrated, or may combine some components, or different components, for example, the electric vehicle low-voltage power supply device 30 may further include an input/output device, a network access device, a bus, and so on.
The processor 31 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor 31 is a control center of the electric vehicle low-voltage power supply device 30, and connects various parts of the entire electric vehicle low-voltage power supply device 30 by using various interfaces and lines.
The memory 32 may be used to store the computer program and/or module, and the processor 31 may implement various functions of the electric vehicle low-voltage power supply device 30 by running or executing the computer program and/or module stored in the memory 32 and invoking data stored in the memory 32. The memory 32 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the operation of the VCU, etc. In addition, the memory 32 may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
The module integrated with the electric vehicle low-voltage power supply device 30 may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a low power supply power supplementing method of electric automobile which characterized in that includes:
responding to a wake-up instruction, and switching the whole vehicle controller from a dormant state to a working state according to the wake-up instruction;
when the condition of the preset power supply is detected to be met, controlling the low-voltage power supply to perform the power supply operation;
when the power supply sensor is detected to be in a normal working state, acquiring the current electric quantity state of the low-voltage power supply detected by the power supply sensor;
when the current electric quantity state meets a preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value, controlling the low-voltage power supply to exit the power supplementing operation;
when the current electric quantity state does not meet the electric quantity state adoption condition, calculating charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method;
when the charging electric quantity information is larger than or equal to a preset high electric quantity information threshold value, controlling the low-voltage power supply to exit the power supplementing operation;
when the whole vehicle controller cannot be switched from a dormant state to a working state according to the awakening instruction, the vehicle-mounted terminal detects the terminal voltage of the low-voltage power supply, and when the terminal voltage is smaller than a preset fault voltage threshold value, the power-supplementing related controller is controlled to enter a self-checking mode to generate fault report information; the fault voltage threshold is smaller than a low voltage threshold, and the wake-up instruction is triggered when the terminal voltage is smaller than the low voltage threshold or the current electric quantity state is smaller than a preset low electric quantity state threshold.
2. The method for supplementing power to the low-voltage power supply of the electric automobile according to claim 1, wherein after the controlling the low-voltage power supply to perform the power supplementing operation, further comprises:
when the power supply sensor is detected to be in a fault state, detecting the output current of the direct current-direct current converter;
and when the output current is equal to the consumption current of the preset low-voltage electric appliance in the vehicle, controlling the low-voltage electric appliance to exit the power supplementing operation.
3. The method for supplementing power to a low-voltage power supply of an electric automobile according to claim 1, wherein the power supplementing condition is:
the current electric quantity state meets the electric quantity state adoption condition, and is smaller than a preset low electric quantity state threshold value;
or detecting that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value.
4. The method for supplementing power to a low-voltage power supply of an electric automobile according to claim 2, wherein the electric quantity state adopts conditions, specifically comprising:
and the current electric quantity state is an effective value, and the error electric quantity state identification information sent by the power supply sensor is not received.
5. The method of claim 1, wherein the wake-up instruction comprises at least one of a first wake-up instruction and a second wake-up instruction; the generation mode of the first wake-up instruction is as follows:
when the power supply sensor detects that the current electric quantity state of the low-voltage power supply is smaller than a preset low-electric quantity state threshold value, a first wake-up instruction is generated;
the second wake-up instruction is generated in the following manner:
and when the battery management system detects that the terminal voltage of the low-voltage power supply is smaller than a preset low-voltage threshold value, generating a second wake-up instruction.
6. The method for supplementing power to a low-voltage power supply of an electric automobile according to claim 1, wherein when the satisfaction of a preset power supplementing condition is detected, further comprising:
when detecting that the power-on related controller has a fault, controlling the power-on related controller to enter a self-checking mode to generate fault report information; the power supply related controller at least comprises the whole vehicle controller.
7. The method of claim 1, wherein the power supply-related controller includes at least the power supply sensor.
8. An electric automobile low voltage power supply device, characterized by comprising:
the state switching module is used for responding to the wake-up instruction and switching the whole vehicle controller from the dormant state to the working state according to the wake-up instruction;
the power supply module is used for controlling the low-voltage power supply to perform power supply operation when the fact that the preset power supply condition is met is detected;
the power supply sensor is used for detecting the power supply state of the low-voltage power supply;
the first power supply exiting module is used for controlling the low-voltage power supply to exit the power supply operation when the current electric quantity state meets the preset electric quantity state adoption condition and is larger than or equal to a preset high electric quantity state threshold value;
the electric quantity information calculation module is used for calculating the charging electric quantity information of the low-voltage power supply according to an ampere-hour integration method when the current electric quantity state does not meet the electric quantity state adoption condition;
the second power supply exiting module is further used for controlling the low-voltage power supply to exit the power supply operation when the charging electric quantity information is greater than or equal to a preset high-electric quantity information threshold value;
the second fault information generation module is used for detecting the terminal voltage of the low-voltage power supply by the vehicle-mounted terminal when the whole vehicle controller cannot be switched from the sleep state to the working state according to the wake-up instruction, and controlling the power-up related controller to enter a self-checking mode to generate fault report information when the terminal voltage is smaller than a preset fault voltage threshold value; the fault voltage threshold is smaller than a low voltage threshold, and the wake-up instruction is triggered when the terminal voltage is smaller than the low voltage threshold or the current electric quantity state is smaller than a preset low electric quantity state threshold.
9. An electric vehicle low voltage power supply device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the electric vehicle low voltage power supply method according to any one of claims 1-7 when executing the computer program.
10. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program when run controls a device in which the computer readable storage medium is located to perform the method for supplementing power to the electric power source of the electric automobile according to any one of claims 1-7.
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