CN114750643A - Automobile low-voltage battery charging method and system and automobile - Google Patents
Automobile low-voltage battery charging method and system and automobile Download PDFInfo
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- CN114750643A CN114750643A CN202110740471.6A CN202110740471A CN114750643A CN 114750643 A CN114750643 A CN 114750643A CN 202110740471 A CN202110740471 A CN 202110740471A CN 114750643 A CN114750643 A CN 114750643A
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- voltage battery
- charging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/13—Maintaining the SoC within a determined range
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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 method and a system for charging a low-voltage battery of an automobile and the automobile, wherein the method comprises the steps of detecting the current power mode of the automobile; when the current power supply mode is a whole vehicle standby mode or a whole vehicle sleep mode, if an automobile area network associated with a battery management system of an automobile is in a sleep state, controlling a high-voltage battery of the automobile to charge a low-voltage battery, and recording first accumulated charging time; detecting a first charging current for charging the low-voltage battery after the first accumulated charging time is greater than a first preset time threshold; and when the first charging current is less than or equal to a first preset current threshold and the first accumulated charging time is less than a second preset time threshold, controlling the high-voltage battery to stop charging the low-voltage battery. The invention improves the accuracy of the power shortage detection of the low-voltage battery and reduces the risk of the power shortage of the low-voltage battery.
Description
Technical Field
The invention relates to the technical field of automobile battery charging management, in particular to an automobile low-voltage battery charging method and system and an automobile.
Background
Along with the development of the automobile industry, the low-voltage electric equipment arranged on the automobile is more and more, and the demand that a user uses the low-voltage electric equipment is more and more, so, the low-voltage battery of the automobile can be caused to have a power shortage risk under the condition that the low-voltage electric equipment is used excessively.
Among the prior art, in order to solve the insufficient voltage problem of the low-voltage battery of car, often increase a management module on low-voltage battery, this management module manages battery power through the electric quantity that detects low-voltage battery to carry out the benefit electricity processing to low-voltage battery when detecting that it takes place the insufficient voltage phenomenon. But this management module has great detection error, will lead to the insufficient voltage of low-voltage battery to detect the rate of accuracy lower, and then can't avoid low-voltage battery's insufficient voltage risk.
Disclosure of Invention
The embodiment of the invention provides a method and a system for charging a low-voltage battery of an automobile and the automobile, which aim to solve the problem that the management module in the prior art has low accuracy in detecting the power shortage of the low-voltage battery.
A method for charging a low-voltage battery of an automobile comprises the following steps:
detecting a current power mode of the automobile;
when the current power supply mode is a whole vehicle standby mode or a whole vehicle sleep mode, if an automobile area network associated with a battery management system of an automobile is in a sleep state, controlling a high-voltage battery of the automobile to charge a low-voltage battery, and recording first accumulated charging time;
Detecting a first charging current for charging the low-voltage battery after the first accumulated charging time is greater than a first preset time threshold;
when the first charging current is smaller than or equal to a first preset current threshold and the first accumulated charging time is smaller than a second preset time threshold, controlling the high-voltage battery to stop charging the low-voltage battery; the first preset time threshold is smaller than the second preset time threshold.
The automobile low-voltage battery charging system comprises a processor connected with a battery management system of an automobile, wherein the processor is used for executing the automobile low-voltage battery charging method; the battery management system is connected with a high-voltage battery and a low-voltage battery of the automobile.
An automobile comprises the automobile low-voltage battery charging system.
According to the method, when the automobile network is switched from the working state (such as other current power supply modes except the whole automobile standby mode and the whole automobile dormant mode) to the dormant state (such as the whole automobile standby mode or the dormant state of the automobile regional network under the whole automobile dormant mode), the strategy of charging and protecting the low-voltage battery by the high-voltage battery is set, so that the low-voltage battery is charged by the high-voltage battery in the dormant state, and the low-voltage battery has the capacity of providing sufficient electric quantity when the low-voltage electric equipment of the automobile is switched to the working state next time, so that the accuracy of power shortage detection of the low-voltage battery is improved, and the risk of power shortage of the low-voltage battery is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a flow chart of a method for charging a low-voltage battery of a vehicle according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an application environment of the charging method for a low-voltage battery of an automobile according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, as shown in fig. 1, a method for charging a low-voltage battery of an automobile is provided, and the method is applied to a domain controller module shown in fig. 2, and includes the following steps:
S10: detecting a current power mode of the automobile;
it can be understood that the vehicle in this embodiment may be a pure electric vehicle, a hybrid vehicle, a pure fuel vehicle, or the like. The current power mode refers to a vehicle power mode of the vehicle, and is used for indicating a current working mode of each electrical system on the vehicle, and the current power mode includes, but is not limited to, a vehicle sleep mode, a vehicle standby mode, a vehicle life mode, a to-be-driven mode, or a driving mode. The current power mode of the automobile can be detected in real time or at regular time in the embodiment.
S20: when the current power supply mode is a finished automobile standby mode or a finished automobile dormant mode, if an automobile area network associated with a battery management system of an automobile is in a dormant state, controlling a high-voltage battery of the automobile to charge a low-voltage battery, and recording first accumulated charging time;
it can be understood that, when the current power mode of the vehicle is the vehicle standby mode and the vehicle sleep mode, if the current power mode is the vehicle standby mode, then each electrical system in the vehicle enters the executable standby mode at this time, and the vehicle network may be in the working mode; if the current power supply mode is the whole vehicle sleep mode, at the moment, each electric system in the vehicle enters a sleep state or a lowest power consumption working state, and the vehicle network is in the sleep state.
Further, upon determining that the current power mode is the entire vehicle standby mode or the entire vehicle sleep mode, it may be determined whether a vehicle area network associated with a battery management system of the vehicle is in a sleep state. The battery management system is used for detecting the charging current output from the high-voltage battery to the low-voltage battery; the automotive area network includes all network nodes in the automotive network that are connected to the battery management system. The dormant state refers to a state in which all devices of the network node connected to the battery management system are in a dormant state.
Further, when the current power supply mode is determined to be the whole vehicle standby mode or the whole vehicle sleep mode, if the vehicle area network associated with the battery management system of the vehicle is in the sleep state, the vehicle network is switched from the working state to the sleep state, at this time, the low-voltage battery has supplied power to the low-voltage equipment in the vehicle for a period of time, the electric quantity of the low-voltage battery is possibly low, in order to prevent the phenomenon of power shortage caused by the fact that the electric quantity of the low-voltage battery cannot supply power to all low-voltage equipment when the automobile network is switched from a dormant state to a working state (namely, the low-voltage equipment of the automobile is in the working state), the DCDC (direct current power supply to direct current power supply) for controlling the high-voltage battery is switched to an open state, thereby enabling the high voltage battery to charge the low voltage battery and recording a first accumulated charging time for the high voltage battery to start charging the low voltage battery through a device such as a timer.
Further, if the automobile area network is not in the dormant state, the high-voltage battery of the automobile is not required to be controlled to charge the low-voltage battery temporarily, until the automobile area network is in the dormant state, the high-voltage battery is controlled to charge the low-voltage battery, and the first accumulated charging time is recorded.
S30: detecting a first charging current for charging the low-voltage battery after the first accumulated charging time is greater than a first preset time threshold;
alternatively, the first preset time threshold may be selected according to the capacity of the low-voltage battery of the vehicle, and the first preset time threshold may be set to 10 minutes, for example. Further, after the high-voltage battery of the automobile is controlled to charge the low-voltage battery and the first accumulated charging time is recorded, the first accumulated charging time is compared with a first preset time threshold, and after the first accumulated charging time is larger than the first preset time threshold, a first charging current for charging the low-voltage battery by the high-voltage battery can be detected in real time or detected regularly. The charging current output by the high-voltage battery can be detected through the battery management system, and is the first charging current.
S40: when the first charging current is smaller than or equal to a first preset current threshold and the first accumulated charging time is smaller than a second preset time threshold, controlling the high-voltage battery to stop charging the low-voltage battery; the first preset time threshold is smaller than the second preset time threshold.
Optionally, the first preset current threshold and the second preset time threshold may also be selected according to the capacitance of the low-voltage battery of the automobile, and for example, the second preset time threshold may be set to 30 minutes; the first preset current threshold may be set to 200 mA. Further, after the first accumulated charging time is greater than the first preset time threshold, the accumulated charging time is greater than the historical empirical value, that is, it is considered in advance that after the first preset time threshold passes, the electric capacity of the low-voltage battery may reach 80% or 90%, so that it may be determined whether the electric capacity of the low-voltage battery reaches a value that meets the requirement for starting the low-voltage device next time by detecting the first charging current; when the first charging current is smaller than or equal to the first preset current threshold, the electric capacity of the low-voltage battery is represented to be 80% and 90%, the electric capacity can meet the requirement of starting the low-voltage equipment next time, the first accumulated charging time is smaller than the second preset time threshold, the high-voltage battery is controlled to stop charging the low-voltage battery, and the first accumulated charging time in the timer is subjected to zero clearing processing.
In this embodiment, when the vehicle network is switched from the operating state (for example, other current power supply modes except the vehicle standby mode and the vehicle sleep mode) to the sleep state (for example, the vehicle standby mode or the vehicle sleep mode is in the sleep state of the regional vehicle network), the strategy of charging and protecting the low-voltage battery by the high-voltage battery is set, so that the low-voltage battery is charged by the high-voltage battery in the sleep state, and the low-voltage battery has the capability of providing sufficient electric quantity when the low-voltage electric equipment of the vehicle is switched to the operating state next time, so that the accuracy of power shortage detection of the low-voltage battery is improved, and the risk of power shortage of the low-voltage battery is reduced.
In an embodiment, after the step S30, that is, after the detecting the first charging current for charging the low voltage battery, the method further includes:
and when the first accumulated charging time is greater than or equal to a second preset time threshold, controlling the high-voltage battery to stop charging the low-voltage battery.
It can be understood that when the first accumulated charging time is greater than or equal to the second preset time threshold, the high-voltage battery is controlled to stop charging the low-voltage battery at this time regardless of whether the first charging current is greater than the first preset current threshold or whether the first charging current is less than or equal to the first preset current threshold. When the first accumulated charging time for charging the low-voltage battery is greater than or equal to the second preset time threshold, the charging process of the high-voltage battery to the low-voltage battery reaches a long time, the residual electric quantity of the low-voltage battery cannot bring power shortage risk when the low-voltage electric equipment is started next time, and the low-voltage battery can be charged through the high-voltage battery after the automobile is in a whole automobile standby mode or a whole automobile sleep mode, so that the high-voltage battery can be directly controlled to stop charging the low-voltage battery, and the low-voltage battery can be prevented from being overcharged.
In an embodiment, after the step S30, that is, after the detecting the first charging current for charging the low voltage battery, the method further includes:
when the first charging current is larger than a first preset current threshold value and the first accumulated charging time is smaller than a second preset time threshold value, controlling the high-voltage battery to continue to charge the low-voltage battery until the first charging current is smaller than or equal to the first preset current threshold value or the first accumulated charging time is larger than or equal to the second preset time threshold value, and controlling the high-voltage battery to stop charging the low-voltage battery.
It can be understood that, when the first charging current is greater than the first preset current threshold and the first accumulated charging time is between the first preset time threshold and the second preset time threshold, the remaining capacity of the low-voltage battery is still small, such as 20%, 30%, and the like, at this time, the high-voltage battery is controlled to continue to charge the low-voltage battery until the first charging current is less than or equal to the first preset current threshold or the first accumulated charging time is greater than or equal to the second preset time threshold, and the high-voltage battery is controlled to stop charging the low-voltage battery.
In an embodiment, after the step S10, that is, after the detecting the current power mode of the vehicle, the method further includes:
when the current power supply mode is not the whole vehicle standby mode or the whole vehicle sleep mode, determining whether a voltage detection module for detecting the voltage of the low-voltage battery is in an on state;
when the voltage detection module is in an on state, the voltage detection module is closed, and the high-voltage battery is controlled to charge the low-voltage battery;
it can be understood that, when the current power mode is not the whole vehicle standby mode or the whole vehicle sleep mode, the current power mode may be an in-vehicle living mode, a waiting driving mode or a driving mode, and at this time, the DCDC of the high-voltage battery of the vehicle is in a working state, so that the high-voltage battery can be controlled to charge the low-voltage battery, and further, whether a voltage detection module for performing voltage detection on the low-voltage battery is in an on state is determined; if the voltage detection module is in an on state, the voltage detection module can be turned off, and the high-voltage battery is controlled to charge the low-voltage battery, so that repeated turning-on of the voltage detection module is reduced, and energy is saved. The voltage detection module includes an AD (Analog Data) detection port of an MCU (micro controller Unit) in the automobile.
Detecting a second charging current for charging the low-voltage battery;
and when the second charging current is less than or equal to the first preset current threshold, controlling the high-voltage battery to stop charging the low-voltage battery.
Specifically, when the voltage detection module is in an on state, the voltage detection module is turned off, and the high-voltage battery is controlled to charge the low-voltage battery, then a second charging current for charging the low-voltage battery can be detected in real time or detected at regular time by the battery management system, the second charging current is compared with a first preset current threshold, and when the second charging current is less than or equal to the first preset current threshold, the high-voltage battery is controlled to stop charging the low-voltage battery; and when the second charging current is greater than the first preset current threshold, controlling the high-voltage battery to continuously charge the low-voltage battery.
In an embodiment, after the step S10, that is, after the detecting the current power mode of the vehicle, the method further includes:
when the current power supply mode is a whole vehicle sleep mode, controlling the high-voltage battery to charge the low-voltage battery;
it can be understood that, when the current power mode is the entire vehicle sleep mode, the vehicle network may be switched from the operating state to the sleep state at this time, the low-voltage battery has supplied power to the low-voltage device in the vehicle for a period of time at this time, which may cause the electric quantity of the low-voltage battery to be low, in order to prevent that when the vehicle network is switched from the sleep state to the operating state (that is, the low-voltage device of the vehicle is in the operating state), the electric quantity of the low-voltage battery cannot supply power to all the low-voltage devices, which causes a power loss phenomenon, and at this time, the DCDC (direct current power supply to direct current power supply) controlling the high-voltage battery is switched to the on state, so that the high-voltage battery charges the low-voltage battery.
If the automobile area network is in an abnormal awakening state, detecting a third charging current for charging the low-voltage battery, and simultaneously recording a second accumulated charging time;
it can be understood that the abnormal wake-up state refers to that the low-voltage electric devices associated with some nodes in the car area network are not switched to the start state, and the low-voltage electric devices associated with some nodes are switched to the start state, so that the third charging current for charging the low-voltage battery can be detected in real time or detected at regular time, and the second accumulated charging time is recorded at the same time.
When the third charging current is smaller than or equal to a second preset current threshold value, or the second accumulated charging time is larger than or equal to a third preset time threshold value, controlling the high-voltage battery to stop charging the low-voltage battery; the third preset time threshold is less than the second preset time interval.
Specifically, after detecting a third charging current for charging the low-voltage battery and recording a second accumulated charging time, comparing the third charging current with a second preset current threshold and the second accumulated charging time with a third preset time threshold, if the third charging current is less than or equal to the second preset current threshold or the second accumulated charging time is greater than or equal to the third preset time threshold, the current remaining capacity of the low-voltage battery is characterized to be high (e.g., 80%, 90%, etc.), so that when the next low-voltage electric equipment is switched to a working state, the low-voltage battery can provide sufficient electric energy and a power shortage phenomenon cannot occur at once, and the high-voltage battery is controlled to stop charging the low-voltage battery. The second preset current threshold may be selected according to the capacitance of the low-voltage battery of the automobile, and may be set to 1A for example; the third preset time threshold may be set to be the same as the first preset time threshold, or may be set to be different from the first preset time threshold, for example, the first preset time threshold and the third preset time threshold may both be set to 10 minutes; the first preset time threshold may also be set to 10 minutes, while the third preset time threshold may be set to 15 minutes, etc.
In an embodiment, after the controlling the high-voltage battery to stop charging the low-voltage battery when the third charging current is less than or equal to a second preset current threshold or the second accumulated charging time is greater than or equal to a third preset time threshold, the method further includes:
detecting a battery voltage of the low-voltage battery;
it can be understood that when the car area network is in the abnormal wake-up state, the low-voltage electric devices of some network nodes are switched to the working state, and therefore after the low-voltage battery is charged through the high-voltage battery (that is, the third charging current is less than or equal to the second preset current threshold, or the second accumulated charging time is greater than or equal to the third preset time threshold), the low-voltage battery can supply power to the low-voltage electric devices switched to the working state, and at this time, the remaining capacity of the low-voltage battery is reduced, so that it is necessary to determine whether the low-voltage battery has a power shortage risk by detecting the battery voltage of the low-voltage battery. Wherein the battery voltage of the low-voltage battery may be detected by a voltage detection module for performing voltage detection on the low-voltage battery.
When the battery voltage is less than or equal to a preset voltage threshold value, controlling the high-voltage battery to charge the low-voltage battery;
specifically, after the battery voltage of the low-voltage battery is detected, the battery voltage is compared with a preset voltage threshold, and if the battery voltage is smaller than or equal to the preset voltage threshold, the current residual capacity of the low-voltage battery is easy to cause a power shortage phenomenon, so that the high-voltage battery is controlled to charge the low-voltage battery. The preset voltage threshold may be set to 8V (for a 12V low-voltage battery).
Detecting a fourth charging current for charging the low-voltage battery, and simultaneously recording a third accumulated charging time;
when the fourth charging current is less than or equal to a first preset current threshold value, or the third accumulated charging time is greater than or equal to a fourth preset time threshold value, controlling the high-voltage battery to stop charging the low-voltage battery; the fourth preset time threshold is greater than the third preset time threshold.
Specifically, when the battery voltage is smaller than or equal to a preset voltage threshold, after the high-voltage battery is controlled to charge the low-voltage battery, detecting a fourth charging current for charging the low-voltage battery in real time or in a timing manner, and simultaneously recording a third accumulated charging time; and comparing the fourth charging current with the first preset current threshold, comparing the third accumulated charging time with the fourth preset time threshold, and when the fourth charging current is less than or equal to the first preset current threshold or the third accumulated charging time is greater than or equal to the fourth preset time threshold, indicating that the current residual capacity of the low-voltage battery is higher (such as 80%, 90% and the like), and further controlling the high-voltage battery to stop charging the low-voltage battery so as to prevent the low-voltage battery from being overcharged.
In one embodiment, after detecting a fourth charging current for charging the low-voltage battery and recording a third accumulated charging time, the method further includes:
and when the fourth charging current is greater than the first preset current threshold and the third accumulated charging time is less than a fourth preset time threshold, controlling the high-voltage battery to continue to charge the low-voltage battery until the fourth charging current is less than or equal to the first preset current threshold or the third accumulated charging time is greater than or equal to the fourth preset time threshold, and controlling the high-voltage battery to stop charging the low-voltage battery.
It can be understood that, after detecting a fourth charging current for charging the low-voltage battery and recording a third accumulated charging time, if the fourth charging current is greater than the first preset current threshold and the third accumulated charging time is between the third preset time threshold and the fourth preset time threshold, at this time, the present remaining capacity representing the low voltage is small (e.g., 20%, 30%, etc.), and there is a power shortage risk, so that the high-voltage battery is controlled to continue to charge the low-voltage battery until the fourth charging current is less than or equal to the first preset current threshold or the third accumulated charging time is greater than or equal to the fourth preset time threshold, and the high-voltage battery is controlled to stop charging the low-voltage battery.
In an embodiment, when the current power mode is a vehicle sleep mode, after controlling the high-voltage battery to charge the low-voltage battery, the method further includes:
if the automobile area network is in a normal awakening state, detecting fourth charging current for charging the low-voltage battery;
and when the fourth charging current is less than or equal to the first preset current threshold, controlling the high-voltage battery to stop charging the low-voltage battery.
It can be understood that the normal wake-up state refers to a state in which the low-voltage electric devices associated with each network node in the automobile area network are all switched to an on state, and at this time, after the high-voltage battery is controlled to charge the low-voltage battery, a fourth charging current for charging the low-voltage battery is detected, and the fourth charging current is compared with a first preset current threshold; if the fourth charging current is less than or equal to the first preset current threshold, the current residual capacity of the low-voltage battery is represented to be higher (such as 90%), and then the high-voltage battery is controlled to stop charging the low-voltage battery, so that the low-voltage battery is prevented from being overcharged; if the fourth charging current is larger than the first preset current threshold, the current residual capacity of the low-voltage battery is represented to be lower (such as 30%), and then the high-voltage battery is controlled to continue to charge the low-voltage battery.
In this embodiment, when the automobile network is switched from the sleep state to the working state (such as the above abnormal wake-up state or the wake-up state), the strategy of charging protection is performed on the low-voltage battery by setting the high-voltage battery, so that the high-voltage battery charges the low-voltage battery in the sleep state, and when the automobile is switched from the sleep mode of the entire automobile to the power mode of other entire automobiles, the low-voltage battery has the capability of providing sufficient electric quantity, the accuracy of power shortage detection of the low-voltage battery is improved, and the risk of power shortage of the low-voltage battery is reduced.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by functions and internal logic of the process, and should not limit the implementation process of the embodiments of the present invention in any way.
In one embodiment, the vehicle low-voltage battery charging system comprises a processor connected with a battery management system of a vehicle, wherein the processor is used for executing the vehicle low-voltage battery charging method; the battery management system is connected with a high-voltage battery and a low-voltage battery of the automobile.
It can be understood that the processor provided in this embodiment may be a domain controller module shown in fig. 2, where the domain controller module is connected to both the low-voltage battery and the high-voltage battery, so as to implement systematic management on the high-voltage battery and the low-voltage battery through the domain controller module, thereby improving the efficiency of charging the low-voltage battery by the high-voltage battery. The battery management system also can be connected with the domain control module, and then make the domain controller module can detect the charging current of high voltage battery output through the battery management system, and then the whole flow that the management and control high voltage battery charges to the low voltage battery, when protecting the security of low voltage battery (also avoid the low voltage battery to have insufficient voltage risk), avoid the low voltage battery phenomenon of overcharging to appear, the charging efficiency that the high voltage battery charges to the low voltage battery has been improved, also prevent frequently to open or close high voltage battery, the life of high voltage battery and low voltage battery has been improved.
Further, as shown in fig. 2, the charging system for the low-voltage battery of the automobile may include at least one zone controller and a zone controller module for executing the charging method for the low-voltage battery of the automobile; and the zone controllers are in communication connection with the central zone controller.
Further, the domain controller module 1 may include a plurality of domain controllers communicatively connected to each other and a battery management system 15 communicatively connected to each other, for example, the central domain controller 10, the first domain controller 11, and the second domain controller 12 in fig. 1 are three different domain controllers, and the central domain controller 10, the first domain controller 11, and the second domain controller 12 are communicatively connected to each other through an ethernet. The area controller module 1 and the area controller 13 are connected through a CAN network.
Further, an electronic control unit 14 is also included in fig. 1, and the electronic control unit 14 is in communication connection with the domain controller module 1; further, the zone controller module 1 and the zone controller 13 are both connected to normal power, and the electronic control unit 14 may be connected to normal power or controllable power (for example, the output device is necessarily controllable power, such as a low beam light, etc.), and it is required that the power consumption of all the normal power modules is within an acceptable range, and it is only required that the power consumption of the entire vehicle meets the requirement (for example, the current of the entire vehicle is less than 25 mA).
In one embodiment, an automobile is provided, and the automobile low-voltage battery charging system is included in the automobile.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method for charging a low-voltage battery of an automobile is characterized by comprising the following steps:
detecting a current power mode of the automobile;
when the current power supply mode is a whole vehicle standby mode or a whole vehicle sleep mode, if an automobile area network associated with a battery management system of an automobile is in a sleep state, controlling a high-voltage battery of the automobile to charge a low-voltage battery, and recording first accumulated charging time;
Detecting a first charging current for charging the low-voltage battery after the first accumulated charging time is greater than a first preset time threshold;
when the first charging current is smaller than or equal to a first preset current threshold and the first accumulated charging time is smaller than a second preset time threshold, controlling the high-voltage battery to stop charging the low-voltage battery; the first preset time threshold is smaller than the second preset time threshold.
2. The method for charging a low-voltage battery of a vehicle according to claim 1, wherein after detecting the first charging current for charging the low-voltage battery, the method further comprises:
and when the first accumulated charging time is greater than or equal to a second preset time threshold, controlling the high-voltage battery to stop charging the low-voltage battery.
3. The method for charging a low-voltage battery of a vehicle according to claim 1, wherein after detecting the first charging current for charging the low-voltage battery, the method further comprises:
when the first charging current is larger than a first preset current threshold value and the first accumulated charging time is smaller than a second preset time threshold value, controlling the high-voltage battery to continue charging the low-voltage battery until the first charging current is smaller than or equal to the first preset current threshold value or when the first accumulated charging time is larger than or equal to the second preset time threshold value, controlling the high-voltage battery to stop charging the low-voltage battery.
4. The method for charging a low-voltage battery of a vehicle according to claim 1, further comprising, after detecting a current power mode of the vehicle:
when the current power supply mode is not the whole vehicle standby mode or the whole vehicle sleep mode, determining whether a voltage detection module for detecting the voltage of the low-voltage battery is in an on state;
when the voltage detection module is in an on state, the voltage detection module is turned off, and the high-voltage battery is controlled to charge the low-voltage battery;
detecting a second charging current for charging the low-voltage battery;
and when the second charging current is less than or equal to the first preset current threshold, controlling the high-voltage battery to stop charging the low-voltage battery.
5. The method for charging a low-voltage battery of a vehicle according to any one of claims 1 to 4, wherein after detecting the current power mode of the vehicle, the method further comprises:
when the current power supply mode is a whole vehicle sleep mode, controlling the high-voltage battery to charge the low-voltage battery;
if the automobile area network is in an abnormal awakening state, detecting a third charging current for charging the low-voltage battery, and simultaneously recording a second accumulated charging time;
When the third charging current is less than or equal to a second preset current threshold value, or the second accumulated charging time is greater than or equal to a third preset time threshold value, controlling the high-voltage battery to stop charging the low-voltage battery; the third preset time threshold is less than the second preset time interval.
6. The method for charging a low-voltage battery of a vehicle according to claim 5, wherein when the third charging current is less than or equal to a second preset current threshold or the second accumulated charging time is greater than or equal to a third preset time threshold, the method further comprises the following steps:
detecting a battery voltage of the low-voltage battery;
when the battery voltage is smaller than or equal to a preset voltage threshold value, controlling the high-voltage battery to charge the low-voltage battery;
detecting a fourth charging current for charging the low-voltage battery, and simultaneously recording a third accumulated charging time;
when the fourth charging current is less than or equal to a first preset current threshold value or the third accumulated charging time is greater than or equal to a fourth preset time threshold value, controlling the high-voltage battery to stop charging the low-voltage battery; the fourth preset time threshold is greater than the third preset time threshold.
7. The method for charging a low-voltage battery of a vehicle according to claim 6, wherein said detecting a fourth charging current for charging said low-voltage battery and recording a third accumulated charging time, further comprises:
and when the fourth charging current is greater than the first preset current threshold and the third accumulated charging time is less than the fourth preset time threshold, controlling the high-voltage battery to continue charging the low-voltage battery until the fourth charging current is less than or equal to the first preset current threshold or the third accumulated charging time is greater than or equal to the fourth preset time threshold, and controlling the high-voltage battery to stop charging the low-voltage battery.
8. The method for charging a low-voltage battery of an automobile according to claim 5, wherein when the current power mode is a full automobile sleep mode, after controlling the high-voltage battery to charge the low-voltage battery, the method further comprises:
if the automobile area network is in a normal awakening state, detecting a fourth charging current for charging the low-voltage battery;
and when the fourth charging current is less than or equal to the first preset current threshold value, controlling the high-voltage battery to stop charging the low-voltage battery.
9. A vehicle low-voltage battery charging system, characterized by comprising a processor connected to a battery management system of a vehicle, the processor being configured to execute the vehicle low-voltage battery charging method according to any one of claims 1 to 8; the battery management system is connected with a high-voltage battery and a low-voltage battery of the automobile.
10. An automobile comprising the automobile low-voltage battery charging system according to claim 9.
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