CN111452745A - Low-voltage storage battery charging method and controller - Google Patents

Low-voltage storage battery charging method and controller Download PDF

Info

Publication number
CN111452745A
CN111452745A CN202010240079.0A CN202010240079A CN111452745A CN 111452745 A CN111452745 A CN 111452745A CN 202010240079 A CN202010240079 A CN 202010240079A CN 111452745 A CN111452745 A CN 111452745A
Authority
CN
China
Prior art keywords
low
vehicle
voltage
battery
storage battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010240079.0A
Other languages
Chinese (zh)
Other versions
CN111452745B (en
Inventor
黎平
程洋
刘韧
李文达
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Digital Power Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN202010240079.0A priority Critical patent/CN111452745B/en
Priority to CN202210629756.7A priority patent/CN115009196A/en
Publication of CN111452745A publication Critical patent/CN111452745A/en
Application granted granted Critical
Publication of CN111452745B publication Critical patent/CN111452745B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
    • B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
    • 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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • 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
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/12—Speed
    • 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
    • Y02T10/72—Electric energy management in electromobility

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Automation & Control Theory (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The embodiment of the application provides a low-voltage storage battery charging method and a controller, the method is applied to a vehicle, the vehicle comprises a vehicle control unit, a low-voltage storage battery, a motor controller and vehicle-mounted charging equipment, and the method comprises the following steps: the vehicle control unit determines that the low-voltage storage battery is in a power-shortage state; the vehicle control unit configures the motor controller to limit the running speed of the vehicle; the vehicle control unit controls the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be separated from a power shortage state; the vehicle control unit configures the motor controller to release the restriction on the traveling speed of the vehicle. By adopting the embodiment of the application, the safety risk caused by the fault of the vehicle-mounted charging equipment can be effectively avoided, and the safety of the vehicle in the driving process is obviously improved.

Description

Low-voltage storage battery charging method and controller
Technical Field
The application relates to the technical field of new energy vehicles, in particular to a low-voltage storage battery charging method and a controller.
Background
Conventional fuel vehicles rely on an engine to drive an alternator to generate electricity to supply power to accessory electrical equipment, and similarly, pure electric vehicles and hybrid vehicles convert high-voltage direct current of a power battery pack into low-voltage direct current through a direct current converter (DCDC) to supply power to low-voltage electrical equipment (such as lighting systems, instrumentation systems, wipers and various controllers) and to charge a low-voltage battery. The low-voltage battery can also supply power to the low-voltage electrical equipment.
When DCDC breaks down, when short-circuit fault, short-circuit current is too big, can lead to the output voltage of low-voltage battery to diminish, and the low-voltage battery can't provide normal operating voltage for low-voltage electrical equipment, takes place the traffic accident very easily when the travelling speed of vehicle is very fast. How to effectively circumvent the safety risk caused by the DCDC failure is therefore an ongoing problem for those skilled in the art.
Disclosure of Invention
The embodiment of the application discloses a low-voltage storage battery charging method and a controller, which can effectively avoid safety risks caused by faults of vehicle-mounted charging equipment and remarkably improve the safety of vehicles in the driving process.
In a first aspect, an embodiment of the present application discloses a method for charging a low-voltage battery, including:
the vehicle control unit determines that the low-voltage storage battery is in a power-shortage state;
the vehicle control unit configures the motor controller to limit the driving speed of the vehicle;
the vehicle controller controls the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be separated from the power shortage state;
the vehicle control unit configures the motor controller to release the restriction on the traveling speed of the vehicle.
In the method, when the low-voltage storage battery is in a power-shortage state, the vehicle control unit limits the running speed of the vehicle; after the low-voltage storage battery is separated from the power shortage state, the whole vehicle controller relieves the limitation on the running speed of the vehicle. Therefore, when the low-voltage storage battery is in a power-loss state, if the vehicle-mounted charging equipment fails, the low-voltage storage battery is powered down, and the safety risk of the vehicle is relatively low due to the fact that the running speed of the vehicle is limited; when the low-voltage storage battery is separated from the power shortage state, if the vehicle-mounted charging equipment breaks down, the low-voltage storage battery cannot be powered down, and therefore the safety of vehicles in the driving process is remarkably improved.
In an optional aspect of the first aspect, the power shortage state is a state where the charge of the low-voltage battery is smaller than a preset threshold.
In the method, whether the low-voltage storage battery is in a power-shortage state or not is judged according to the relative size of the electric quantity of the low-voltage storage battery and the preset threshold value, and the judging mode is simple and efficient.
In yet another optional aspect of the first aspect, when the charge level of the low-voltage battery is less than a preset threshold, the charge level of the low-voltage battery cannot fuse the fuse between the vehicle-mounted charging device and the low-voltage battery.
In the method, after the low-voltage storage battery is separated from the power shortage state, if the vehicle-mounted charging equipment breaks down, the low-voltage storage battery can provide electric quantity to fuse a fuse between the vehicle-mounted charging equipment and the low-voltage storage battery, and the broken vehicle-mounted charging equipment and the low-voltage storage battery are separated in time, so that the low-voltage storage battery cannot be powered down, and the safety performance of a vehicle is effectively improved.
In yet another optional aspect of the first aspect, the controlling the vehicle controller to control the vehicle-mounted charging device to charge the low-voltage battery so as to enable the low-voltage battery to be out of the power-deficient state includes:
the vehicle control unit controls the vehicle-mounted charging equipment to charge the low-voltage storage battery for a target time length so as to enable the low-voltage storage battery to be separated from the power shortage state, wherein the target time length is a preset time length or a time length determined according to one or more of power consumption of the low-voltage storage battery in unit time, charging capacity of the vehicle-mounted charging equipment in unit time and preset target power.
In the method, specifically, the target time length is charged for the low-voltage storage battery, the preset time length for charging the low-voltage storage battery is that the low-voltage storage battery is considered to be out of a power-loss state, and whether the vehicle is in the power-loss state is not continuously detected in real time, so that the large calculation overhead caused by multiple detections is avoided, and the service life of a related circuit is also prevented from being shortened caused by multiple detections.
In yet another optional aspect of the first aspect, the vehicle further comprises a voltage detection circuit and a signal transmission circuit; before the vehicle control unit determines that the low-voltage battery is in a power-shortage state, the method further comprises the following steps:
and receiving the signal which is sent by the signal transmission circuit and indicates that the low-voltage storage battery is in the signal of the power-down state, wherein the signal which indicates that the low-voltage storage battery is in the power-down state is obtained by the voltage detection circuit.
In yet another optional aspect of the first aspect, the vehicle-mounted charging device is a dc converter DCDC, and the voltage detection circuit and the signal transmission circuit are configured in the DCDC.
In the method, the voltage detection circuit and the signal transmission circuit can be configured in the DCDC, on one hand, some lines in the DCDC can be multiplexed, and the circuit is prevented from being too complex; on the other hand, because the design is in the DCDC, the space except the DCDC is not required to be occupied, and the space utilization rate of the device is improved.
In still another optional aspect of the first aspect, a voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery when the travel speed of the vehicle is limited is smaller than a voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery when the travel speed of the vehicle is not limited. Therefore, the situation that the battery is damaged or the service life of the battery is reduced due to overlarge charging current when the low-voltage storage battery is in a serious insufficient state can be avoided.
In a second aspect, an embodiment of the application provides a vehicle control unit, where the vehicle control unit is in a vehicle, and the vehicle further includes a low-voltage battery, a motor controller, and a vehicle-mounted charging device; the vehicle control unit comprises:
a determination unit for determining that the low-voltage battery is in a state of insufficient power;
a first configuration unit configured to configure the motor controller to limit a traveling speed of the vehicle;
the charging unit is used for controlling the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be separated from the power shortage state;
a second configuration unit configured to configure the motor controller to release a restriction on a traveling speed of the vehicle.
In the device, when the low-voltage storage battery is in a power-shortage state, the vehicle control unit limits the running speed of the vehicle; after the low-voltage storage battery is separated from the power shortage state, the whole vehicle controller relieves the limitation on the running speed of the vehicle. Therefore, when the low-voltage storage battery is in a power-loss state, if the vehicle-mounted charging equipment fails, the low-voltage storage battery is powered down, and the safety risk of the vehicle is relatively low due to the fact that the running speed of the vehicle is limited; when the low-voltage storage battery is separated from the power shortage state, if the vehicle-mounted charging equipment breaks down, the low-voltage storage battery cannot be powered down, and therefore the safety of vehicles in the driving process is remarkably improved.
In an optional aspect of the second aspect, the power shortage state is a state where the charge of the low-voltage battery is less than a preset threshold.
In the device, whether the low-voltage storage battery is in a power-shortage state or not is measured by the relative size of the electric quantity of the low-voltage storage battery and the preset threshold value, and the judging mode is simple and efficient.
In yet another optional aspect of the second aspect, when the charge level of the low-voltage battery is less than a preset threshold, the charge level of the low-voltage battery cannot fuse the fuse between the vehicle-mounted charging device and the low-voltage battery.
In the device, after the low-voltage storage battery is separated from the power shortage state, if the vehicle-mounted charging equipment breaks down, the low-voltage storage battery can provide electric quantity to fuse the fuse between the vehicle-mounted charging equipment and the low-voltage storage battery, and the vehicle-mounted charging equipment which breaks down is separated from the low-voltage storage battery in time, so that the low-voltage storage battery cannot be powered down, and the safety performance of a vehicle is effectively improved.
In yet another optional aspect of the second aspect, the charging unit is specifically configured to control the vehicle-mounted charging apparatus to charge the low-voltage battery for a target time period to enable the low-voltage battery to be out of the power-deficient state, where the target time period is a preset time period or a time period determined according to one or more of a power consumption amount of the low-voltage battery per unit time, a charging amount of the vehicle-mounted charging apparatus per unit time, and a preset target power amount.
In the device, specifically, the target charging duration for the low-voltage storage battery is determined as the preset charging duration for the low-voltage storage battery, that is, the low-voltage storage battery is not detected whether the vehicle is in a power-shortage state continuously in real time, so that the large calculation overhead caused by multiple detections is avoided, and the service life of a related circuit is also prevented from being shortened caused by multiple detections.
In yet another alternative of the second aspect, the vehicle further includes a voltage detection circuit and a signal transmission circuit; the vehicle control unit further comprises:
and the receiving unit is used for receiving a signal which is sent by the signal transmission circuit and is used for representing that the low-voltage storage battery is in the insufficient state before the determining unit determines that the low-voltage storage battery is in the insufficient state, wherein the signal which is used for representing that the low-voltage storage battery is in the insufficient state is acquired by the voltage detection circuit.
In yet another optional aspect of the second aspect, the vehicle-mounted charging device is a DCDC, and the voltage detection circuit and the signal transmission circuit are configured in the DCDC.
In the device, the voltage detection circuit and the signal transmission circuit can be configured in the DCDC, on one hand, some lines in the DCDC can be multiplexed, and the circuit is prevented from being too complex; on the other hand, because the design is in the DCDC, the space except the DCDC is not required to be occupied, and the space utilization rate of the device is improved.
In still another alternative of the second aspect, the voltage at which the on-vehicle charging apparatus charges the low-voltage battery when the travel speed of the vehicle is limited is smaller than the voltage at which the on-vehicle charging apparatus charges the low-voltage battery when the travel speed of the vehicle is not limited. Therefore, the situation that the battery is damaged or the service life of the battery is reduced due to overlarge charging current when the low-voltage storage battery is in a serious insufficient state can be avoided.
In a third aspect, the embodiment of the present application provides another vehicle controller, where the vehicle controller is in a vehicle, and the vehicle further includes a low-voltage battery, a motor controller, and a vehicle-mounted charging device; the vehicle control unit comprises a communication interface, a processor and a memory, wherein the memory is used for storing a computer program, and the processor calls the computer program and is used for executing the following operations:
determining that the low-voltage battery is in a power-deficient state;
configuring the motor controller to limit a travel speed of the vehicle;
controlling the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be separated from the power shortage state;
the motor controller is configured to release the restriction on the traveling speed of the vehicle.
In the device, when the low-voltage storage battery is in a power-shortage state, the vehicle control unit limits the running speed of the vehicle; after the low-voltage storage battery is separated from the power shortage state, the whole vehicle controller relieves the limitation on the running speed of the vehicle. Therefore, when the low-voltage storage battery is in a power-loss state, if the vehicle-mounted charging equipment fails, the low-voltage storage battery is powered down, and the safety risk of the vehicle is relatively low due to the fact that the running speed of the vehicle is limited; when the low-voltage storage battery is separated from the power shortage state, if the vehicle-mounted charging equipment breaks down, the low-voltage storage battery cannot be powered down, and therefore the safety of vehicles in the driving process is remarkably improved.
In an optional aspect of the third aspect, the power shortage state is a state where the charge of the low-voltage battery is smaller than a preset threshold.
In the device, whether the low-voltage storage battery is in a power-shortage state or not is measured by the relative size of the electric quantity of the low-voltage storage battery and the preset threshold value, and the judging mode is simple and efficient.
In yet another optional aspect of the third aspect, when the charge level of the low-voltage battery is less than a preset threshold, the charge level of the low-voltage battery cannot fuse the fuse between the vehicle-mounted charging device and the low-voltage battery.
In the device, after the low-voltage storage battery is separated from the power shortage state, if the vehicle-mounted charging equipment breaks down, the low-voltage storage battery can provide electric quantity to fuse the fuse between the vehicle-mounted charging equipment and the low-voltage storage battery, and the vehicle-mounted charging equipment which breaks down is separated from the low-voltage storage battery in time, so that the low-voltage storage battery cannot be powered down, and the safety performance of a vehicle is effectively improved.
In yet another optional aspect of the third aspect, the processor controls the vehicle-mounted charging device to charge the low-voltage battery, so that when the low-voltage battery is out of the power-deficient state, specifically:
and controlling the vehicle-mounted charging equipment to charge the low-voltage storage battery for a target time length so as to enable the low-voltage storage battery to be separated from the power shortage state, wherein the target time length is a preset time length or a time length determined according to one or more of the power consumption of the low-voltage storage battery in unit time, the charging amount of the vehicle-mounted charging equipment in unit time and a preset target electric quantity.
In the device, specifically, the target charging duration for the low-voltage storage battery is determined as the preset charging duration for the low-voltage storage battery, that is, the low-voltage storage battery is not detected whether the vehicle is in a power-shortage state continuously in real time, so that the large calculation overhead caused by multiple detections is avoided, and the service life of a related circuit is also prevented from being shortened caused by multiple detections.
In yet another optional aspect of the third aspect, before determining that the low-voltage battery is in a low-voltage state, the processor is further configured to:
and receiving the signal which is sent by the signal transmission circuit and indicates that the low-voltage storage battery is in the signal of the power-down state, wherein the signal which indicates that the low-voltage storage battery is in the power-down state is obtained by the voltage detection circuit.
In yet another optional aspect of the third aspect, the vehicle-mounted charging device is a DCDC, and the voltage detection circuit and the signal transmission circuit are configured in the DCDC.
In the device, the voltage detection circuit and the signal transmission circuit can be configured in the DCDC, on one hand, some lines in the DCDC can be multiplexed, and the circuit is prevented from being too complex; on the other hand, because the design is in the DCDC, the space except the DCDC is not required to be occupied, and the space utilization rate of the device is improved.
In still another optional aspect of the third aspect, a voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery when the travel speed of the vehicle is limited is smaller than a voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery when the travel speed of the vehicle is not limited. Therefore, the situation that the battery is damaged or the service life of the battery is reduced due to overlarge charging current when the low-voltage storage battery is in a serious insufficient state can be avoided.
In a fourth aspect, an embodiment of the present application provides a vehicle, where the vehicle includes a vehicle control unit, where the vehicle control unit is the vehicle control unit described in the second aspect, or any one optional aspect of the second aspect; alternatively, the vehicle control unit is the vehicle control unit described in the third aspect, or any one of optional aspects of the third aspect.
In a fifth aspect, embodiments of the present application provide a computer-readable storage medium, which stores instructions that, when executed on a processor, implement the method described in the first aspect or any one of the alternatives of the first aspect.
In a sixth aspect, an embodiment of the present application provides a chip system, where the chip system includes at least one processor, a memory, and an interface circuit, where the memory, the interface circuit, and the at least one processor are interconnected by a line, and a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method described in the first aspect or any one of the alternatives of the first aspect is implemented.
Drawings
The drawings used in the embodiments of the present application are described below.
FIG. 1A is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure;
fig. 1B is a schematic structural diagram of a low-voltage power supply system according to an embodiment of the present disclosure;
fig. 1C is a schematic structural diagram of another low-voltage power supply system provided in the embodiment of the present application;
FIG. 2 is a schematic flow chart of a method for charging a low-voltage battery according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a vehicle control unit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another vehicle control unit provided in the embodiment of the present application.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1A, fig. 1A is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure, where the vehicle may be a pure electric vehicle or a hybrid electric vehicle, the vehicle may include a low-voltage power supply system 10 and a low-voltage electrical device 20, the low-voltage power supply system 10 may supply power to the low-voltage electrical device 20 through a vehicle bus, so that the low-voltage electrical device 20 operates normally, the vehicle bus may be, but is not limited to, a local interconnect network (L IN) bus, a Controller Area Network (CAN) bus, and the like, and the low-voltage electrical device 20 may include, but is not limited to, a light system, an instrument system, a body accessory (such as a horn, a windshield wiper, a defrosting device, an air conditioning device, and the like), and various related controllers, and the like.
Referring to fig. 1B and fig. 1C, fig. 1B and fig. 1C are schematic structural diagrams of a low-voltage power supply system 10 provided in an embodiment of the present application, where the low-voltage power supply system 10 may include a vehicle-mounted charging device 11, a low-voltage battery 12, and a Vehicle Control Unit (VCU) 13, where the vehicle-mounted charging device 11 is electrically connected to the low-voltage battery 12 through a bus at a low voltage, and the vehicle-mounted charging device 11 is connected to the VCU13 through a vehicle bus.
The vehicle-mounted charging device 11 may be a device having a direct current converter (DCDC) function, for example, the vehicle-mounted charging device 11 may be a DCDC, or may be an all-in-one vehicle-mounted charging device including a DCDC and a vehicle-mounted charger (OBC). The VCU13 may control the in-vehicle charging device 11 to charge the low-voltage battery 12.
Optionally, as shown in fig. 1B, the vehicle-mounted charging device 11 is a DCDC, wherein the DCDC11 is configured with a voltage detection circuit 111 and a signal transmission circuit 112; the voltage detection circuit 111 is configured to detect a voltage of the low-voltage battery 12, and the signal transmission circuit 112 is configured to transmit a signal indicating a state of the low-voltage battery 12 to the VCU 13. For example, when the DCDC11 does not charge the low-voltage battery 12, that is, the output current of the DCDC11 to the low-voltage battery 12 is 0, the voltage detection circuit 111 may detect the voltage of the low-voltage battery 12 through a circuit between the DCDC11 and the low-voltage battery 12, and obtain the state of the low-voltage battery 12 from the voltage, and then transmit a signal representing the state of the low-voltage battery 12 to the VCU13 through the signal transmission circuit 112.
Alternatively, as shown in fig. 1C, the vehicle-mounted charging device 11 is DCDC, the voltage detection circuit 111 and the signal transmission circuit 112 are disposed outside the DCDC11, and the voltage detection circuit 111 and the signal transmission circuit 112 may also be disposed outside the low-voltage battery 12, for example, the voltage detection circuit 111 may be electrically connected to the low-voltage battery 12 and the signal transmission circuit 112 at a low voltage, and the signal transmission circuit 112 is connected to the VCU13 through a vehicle bus. For example, when the DCDC11 does not charge the low-voltage battery 12, that is, the output current of the DCDC11 to the low-voltage battery 12 is 0, the voltage detection circuit 111 may detect the voltage of the low-voltage battery 12 through a circuit between the DCDC11 and the low-voltage battery 12, and obtain the state of the low-voltage battery 12 from the voltage, and then transmit a signal representing the state of the low-voltage battery 12 to the VCU13 through the signal transmission circuit 112.
Alternatively, the VCU13 may be disposed outside the low voltage power supply system 10, and the VCU13, the low voltage power supply system 10, and the low voltage electrical device 20 are connected by a vehicle bus.
In the embodiment of the present application, the bus bar between the on-vehicle charging device 11 and the low-voltage battery 12 may be provided with a fuse, which is an overcurrent protector, based on the principle that when the current exceeds a prescribed threshold for a certain period of time, the fuse melts with the heat generated by itself, thereby breaking the circuit. When the vehicle-mounted charging equipment 11 breaks down, the fuse is fused by the electric quantity supplied by the low-voltage storage battery 12, so that the vehicle-mounted charging equipment 11 with the fault is separated from the low-voltage storage battery 12, and the safety risk that the low-voltage storage battery 12 is powered down due to the fault of the vehicle-mounted charging equipment 11 and the low-voltage electrical equipment 20 cannot obtain normal working voltage is avoided. However, the above safety risk is unavoidable when the fuse cannot be blown due to insufficient power of the low-voltage battery 12. Therefore, in order to effectively avoid the safety risk caused by the failure of the vehicle-mounted charging device 11, the embodiment of the present application provides a low-voltage battery charging method, and specifically, refer to the following description of fig. 2.
Referring to fig. 2, fig. 2 is a low-voltage battery charging method provided in an embodiment of the present application, which may be implemented based on the low-voltage power supply system 10 in fig. 1A, 1B, and 1C, and the method includes, but is not limited to, the following steps:
step S201: the voltage detection circuit detects the voltage of the low-voltage battery.
For example, when the vehicle-mounted charging apparatus does not charge the low-voltage battery, that is, the vehicle-mounted charging apparatus outputs a current of 0 to the low-voltage battery, the voltage detection circuit may detect the voltage across the low-voltage battery through a circuit between the vehicle-mounted charging apparatus and the low-voltage battery.
Optionally, the voltage detection circuit may obtain a corresponding state of charge (SOC) according to the detected voltage of the low-voltage battery, that is, a signal representing the state of the low-voltage battery is obtained by the voltage detection circuit, and the signal is sent to the VCU by the signal transmission circuit.
Optionally, the voltage detection circuit may send the detected voltage of the low-voltage battery to the calculation and analysis circuit, and the calculation and analysis circuit obtains a corresponding SOC according to the voltage of the low-voltage battery, that is, the calculation and analysis circuit obtains a signal representing a state of the low-voltage battery, and then the signal transmission circuit sends the signal to the VCU. Optionally, the calculation and analysis circuit may be electrically connected to the voltage detection circuit and the signal transmission circuit at a low voltage.
In the embodiment of the present application, the voltage detection circuit and the signal transmission circuit may be the circuits configured in the vehicle-mounted charging device (i.e., DCDC) in fig. 1B, or may be the circuits designed independently from the vehicle-mounted charging device (i.e., DCDC) in fig. 1C; besides, the calculation analysis circuit may be a circuit configured in the DCDC, or may be a circuit designed independently of the DCDC.
Step S202: the VCU receives the signal which is sent by the signal transmission circuit and represents the state of the low-voltage storage battery.
Specifically, the VCU analyzes the received signal that characterizes the state of the low-voltage battery, and the analysis result may have two cases: one is that the VCU analyzes and determines that the low-voltage battery is in a state of low-voltage, as shown in steps S203-S206; another situation is where the VCU analyzes and determines that the low-voltage battery is in a non-deficient state, as shown in steps S207-S208.
Step S203: the VCU determines that the low-voltage battery is in a low-voltage state.
Specifically, the VCU determines that the low-voltage battery is in a low-voltage state according to the signal representing the state of the low-voltage battery; optionally, the power shortage state is a state in which the electric quantity of the low-voltage storage battery is smaller than a preset threshold; optionally, when the electric quantity of the low-voltage battery is smaller than the preset threshold, the fuse between the vehicle-mounted charging device and the low-voltage battery cannot be fused by the electric quantity of the low-voltage battery.
In the embodiment of the present application, a value for reference comparison (for example, the above preset threshold value) may be pre-configured in the VCU to measure whether the low-voltage battery is in the insufficient state or the non-insufficient state; the preset threshold is determined according to performance parameters of the low-voltage battery, such as, but not limited to, open-circuit voltage, battery capacity, battery energy, energy density, internal resistance, and the like. For ease of understanding, the following examples are given.
Case 1, it may be determined that the low-voltage battery is in a state of insufficient power if the SOC is less than or equal to a preset first threshold value, and it may be determined that the low-voltage battery is in a state of non-insufficient power if the SOC is greater than the first threshold value. For example, if the voltage capacity of the low-voltage battery is 100 ten thousand milliamperes, 5 ten thousand milliamperes is required to blow a fuse between the vehicle-mounted charging device and the low-voltage battery, and since 5 ten thousand milliamperes account for 5% of 100 milliamperes, the first threshold value may be set to 5%. Therefore, if the SOC is less than or equal to 5%, the low-voltage secondary battery cannot blow the fuse between the vehicle-mounted charging apparatus and the low-voltage secondary battery, and if the SOC is greater than 5%, the low-voltage secondary battery can blow the fuse between the vehicle-mounted charging apparatus and the low-voltage secondary battery.
In case 2, the VCU may determine the remaining capacity of the low-voltage battery according to the SOC, and may determine that the low-voltage battery is in a power-deficient state if the remaining capacity is less than or equal to a preset second threshold, and may determine that the low-voltage battery is in a non-power-deficient state if the remaining capacity is greater than the second threshold. For example, if 5 ten thousand milliamps of power is required to blow a fuse between the onboard charging device and the low-voltage battery, the second threshold may be set to 5 ten thousand milliamps. Therefore, if the remaining capacity is less than or equal to 5 ten thousand milliamperes, the fuse between the vehicle-mounted charging device and the low-voltage battery cannot be fused by the low-voltage battery, and if the remaining capacity is greater than 5 ten thousand milliamperes, the fuse between the vehicle-mounted charging device and the low-voltage battery can be fused by the low-voltage battery.
Case 3, it may be determined that the low-voltage battery is in a power-deficient state if the amount of power consumed by the low-voltage battery per unit time is greater than or equal to a preset third threshold value, and it may be determined that the low-voltage battery is in a non-power-deficient state if the amount of power consumed by the low-voltage battery per unit time is less than the third threshold value. For example, if the voltage capacity of the low-voltage battery is 100 ten thousand milliamperes and the remaining power is 90 ten thousand milliamperes, 10 ten thousand milliamperes are required for blowing the fuse between the vehicle-mounted charging device and the low-voltage battery, 10 ten thousand milliamperes are consumed by the low-voltage battery within 1 second, and the power consumption speed is too high, so that the fuse between the vehicle-mounted charging device and the low-voltage battery can be consumed within 8 seconds, the third threshold value can be set to 5 ten thousand milliamperes, the power consumption speed is low, and at least 16 seconds are required for consuming the power until the fuse cannot be blown. Therefore, if the amount of electricity consumed by the low-voltage battery per unit time is equal to or greater than 5 ten thousand milliamperes, the fuse between the vehicle-mounted charging device and the low-voltage battery cannot be blown by the low-voltage battery, and if the amount of electricity consumed by the low-voltage battery per unit time is less than 5 ten thousand milliamperes, the fuse between the vehicle-mounted charging device and the low-voltage battery can be blown by the low-voltage battery.
Optionally, the battery detection circuit may further use the detected voltage of the low-voltage battery as a signal representing a state of the low-voltage battery, and send the signal to the VCU through the signal transmission circuit, and the VCU determines whether the low-voltage battery is in a power-deficient state or a non-power-deficient state according to the signal.
Optionally, a value for reference comparison (for example, the preset threshold value) may be configured in the voltage detection circuit or the calculation and analysis circuit to measure whether the low-voltage battery is in the insufficient state or the non-insufficient state, so as to obtain a signal indicating that the low-voltage battery is in the insufficient state or the non-insufficient state, and the signal is sent to the VCU through the signal transmission circuit; the VCU can directly confirm whether the low-voltage battery is in a power-deficient state or a non-power-deficient state according to the signal, and the embodiment of the present application is not limited to the execution device for determining whether the low-voltage battery is in the power-deficient state or the non-power-deficient state.
Step S204: the VCU configures the motor controller to limit the travel speed of the vehicle.
Specifically, the VCU may send instructions for controlling gears, throttle, brakes, or the like to the motor controller, which drives the vehicle motor according to the instructions to limit the traveling speed of the vehicle. For example, if the running speed of the vehicle is 80 km/h, when the VCU determines that the low-voltage battery is in a power-deficient state, the VCU may send an instruction for controlling the running speed to be 40 km/h to the motor controller, and the motor controller drives the vehicle motor according to the instruction to limit the running speed of the vehicle to be less than or equal to 40 km/h; or, when the VCU determines that the low-voltage storage battery is in a power-shortage state, the VCU may send a braking instruction to the motor controller, and the motor controller controls the vehicle motor to stop working according to the braking instruction so as to stop the vehicle from running.
Step S205: the VCU controls the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be out of a power shortage state.
Optionally, if the vehicle-mounted charging device is DCDC, the VCU controls the vehicle-mounted charging device to charge the low-voltage battery.
Optionally, the vehicle-mounted charging device is an all-in-one vehicle-mounted charging device, and the VCU controls the DCDC in the vehicle-mounted charging device to charge the low-voltage storage battery.
Two alternative charging schemes for removing the low voltage battery from a brown-out condition are exemplified below:
scheme one, the on-vehicle battery charging outfit of VCU control lasts for low voltage battery charges, detects the electric quantity in the low voltage battery simultaneously according to predetermined frequency, and when the electric quantity of low voltage battery was enough to fuse the fuse between on-vehicle battery charging outfit and the low voltage battery, VCU thought that the low voltage battery has broken away from insufficient voltage state. For example, the detection is performed at a frequency of 1 time per 1 minute, and when the remaining capacity of the low-voltage battery is detected to be greater than the preset second threshold, the capacity of the low-voltage battery is considered to be sufficient to blow a fuse between the vehicle-mounted charging apparatus and the low-voltage battery, that is, the low-voltage battery is out of a power-deficient state.
And in the second scheme, the VCU controls the vehicle-mounted charging equipment to charge the low-voltage storage battery for the target time length so as to enable the low-voltage storage battery to be separated from the power shortage state. The target time period may be a time period determined according to one or more of the power consumption amount of the low-voltage battery per unit time, the charge amount of the vehicle-mounted device per unit time, and a preset target power amount. For example, the VCU first determines a current electric quantity of the low-voltage battery, a charging speed of the vehicle-mounted charging device, and a target electric quantity corresponding to the low-voltage battery, wherein when the electric quantity of the low-voltage battery is the target electric quantity, the low-voltage battery can provide electric quantity to fuse a fuse between the low-voltage battery and the vehicle-mounted charging device; then, the VCU calculates a difference value between the target electric quantity and the current electric quantity, and divides the difference value by the charging speed to obtain a target duration; when the charging time of the low-voltage storage battery reaches the target time, the electric quantity of the low-voltage storage battery is enough to fuse the fuse between the low-voltage storage battery and the vehicle-mounted charging equipment, namely, the low-voltage storage battery is separated from a power shortage state.
Alternatively, the target time period may be a time period preset according to the charging law of a large number of vehicles, for example, 5 minutes.
Optionally, the charging speed of the vehicle-mounted charging device may be a parameter configured in the VCU when the vehicle is produced, or may be a current charging speed of the vehicle-mounted charging device detected in real time.
In the embodiment of the application, through charging for low voltage battery, can activate low voltage battery, make the voltage reduction that the internal resistance of low voltage battery corresponds to make low voltage battery's output voltage increase, increase to a certain extent when low voltage battery's output voltage just can fuse the fuse between on-vehicle charging equipment and the low voltage battery, low voltage battery has broken away from insufficient voltage state promptly.
Step S206: the VCU configures the motor controller to release the restriction on the travel speed of the vehicle.
Specifically, when the low-voltage battery is out of a power-deficient state, the VCU may send an instruction for controlling a gear, an accelerator, a brake, or the like to the motor controller, and the motor controller drives the vehicle motor according to the instruction to remove the limitation on the running speed of the vehicle, so that the vehicle may run normally. For example, if the VCU configures the motor controller to stop running after step S204, when the low-voltage battery is out of the power-loss state, the VCU may send a start instruction to the motor controller, and the motor controller drives the vehicle motor to operate according to the start instruction to start running.
Optionally, the voltage charged by the vehicle-mounted charging device for the low-voltage storage battery when the vehicle normally runs (i.e. the running speed of the vehicle is not limited) is greater than the voltage charged by the vehicle-mounted charging device for the low-voltage storage battery when the running speed of the vehicle is limited; for example, the voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery after step S206 is larger than the voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery in step S205. Therefore, the situation that the fault of the low-voltage storage battery or the service life of the low-voltage storage battery is shortened due to overlarge charging current when the low-voltage storage battery is in a serious power shortage state is avoided.
In the embodiment of the application, after the low voltage battery breaks away from the insufficient voltage state, VCU removes the restriction to the speed of travel of vehicle, if VCU detects on-vehicle charging equipment trouble this moment, then can send the instruction of fusing the fuse between on-vehicle charging equipment and the low voltage battery to the low voltage battery, the low voltage battery responds to this instruction, provides the above-mentioned fuse of electric quantity fusing, thereby break away from the on-vehicle charging equipment and the low voltage power supply system of trouble, avoid low voltage battery and low voltage electrical equipment to take place the safety risk of losing electricity.
Optionally, after the low-voltage storage battery breaks away from the insufficient voltage state, the VCU removes the restriction to the speed of travel of vehicle, if the low-voltage storage battery detects on-vehicle charging equipment trouble this moment, then provides the above-mentioned fuse of electric quantity fusing to break away from the on-vehicle charging equipment and the low-voltage power supply system of trouble, avoid low-voltage storage battery and low-voltage electrical equipment to take place the safety risk of falling the electricity.
Step S207: the VCU determines that the low-voltage battery is in a non-deficient state.
Specifically, the VCU determines that the low-voltage battery is in a non-power-deficit state according to the signal representing the state of the low-voltage battery; the non-power-shortage state is a state in which the electric quantity of the low-voltage battery is greater than or equal to the preset threshold value.
Step S208: the VCU controls the vehicle-mounted charging equipment to charge the low-voltage storage battery.
Specifically, when the low-voltage storage battery is in a non-power-shortage state, the VCU can also control the vehicle-mounted charging device to charge the low-voltage storage battery, and the vehicle runs normally.
Optionally, the voltage charged by the vehicle-mounted charging device for the low-voltage storage battery when the vehicle normally runs (i.e. the running speed of the vehicle is not limited) is greater than the voltage charged by the vehicle-mounted charging device for the low-voltage storage battery when the running speed of the vehicle is limited; for example, the voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery in step S208 is larger than the voltage at which the vehicle-mounted charging apparatus charges the low-voltage battery in step S205. Therefore, the situation that the fault of the low-voltage storage battery or the service life of the low-voltage storage battery is shortened due to overlarge charging current when the low-voltage storage battery is in a serious power shortage state is avoided.
In the method depicted in fig. 2, the VCU limits the travel speed of the vehicle when the low-voltage battery is in a brown-out condition, and controls the onboard charging device to charge the low-voltage battery to bring the low-voltage battery out of the brown-out condition; the VCU then releases the restriction on the vehicle's travel speed when the low-voltage battery is out of the brown-out condition. On one hand, if the vehicle-mounted charging equipment fails before the low-voltage storage battery is separated from the power-shortage state and the low-voltage storage battery is powered down, the vehicle speed is limited, so that the vehicle cannot have serious safety problems; on the other hand, if the vehicle-mounted charging equipment breaks down after the low-voltage storage battery is separated from the power shortage state, the low-voltage storage battery cannot be powered down, and therefore the safety problem of the vehicle cannot occur. In conclusion, the safety of the vehicle in the driving process can be obviously improved by adopting the embodiment of the application.
The method of the embodiments of the present application is set forth above in detail and the apparatus of the embodiments of the present application is provided below.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a VCU provided in an embodiment of the present application, where the VCU is in a vehicle, and the vehicle further includes a low-voltage battery, a motor controller, and an onboard charging device. VCU300 may include a determination unit 301, a first configuration unit 302, a charging unit 303, and a second configuration unit 304, wherein the detailed description of each unit is as follows:
a determination unit 301 for determining that the low-voltage battery is in a state of insufficient power;
a first configuration unit 302 for configuring the motor controller to limit a traveling speed of the vehicle;
a charging unit 303, configured to control the vehicle-mounted charging apparatus to charge the low-voltage battery, so that the low-voltage battery is out of the power-deficient state;
a second configuration unit 304, configured to configure the motor controller to release the limitation on the running speed of the vehicle.
It can be seen that when the low-voltage storage battery is in a power-loss state, the vehicle control unit limits the running speed of the vehicle; after the low-voltage storage battery is separated from the power shortage state, the whole vehicle controller relieves the limitation on the running speed of the vehicle. Therefore, when the low-voltage storage battery is in a power-loss state, if the vehicle-mounted charging equipment fails, the low-voltage storage battery is powered down, and the safety risk of the vehicle is relatively low due to the fact that the running speed of the vehicle is limited; when the low-voltage storage battery is separated from the power shortage state, if the vehicle-mounted charging equipment breaks down, the low-voltage storage battery cannot be powered down, and therefore the safety of vehicles in the driving process is remarkably improved.
In an alternative, the power shortage state is a state in which the charge of the low-voltage battery is less than a preset threshold.
It can be seen that whether the low-voltage storage battery is in a power shortage state or not is measured according to the relative size of the electric quantity of the low-voltage storage battery and a preset threshold value, and the judging mode is simple and efficient.
In yet another alternative, when the charge of the low-voltage battery is less than a preset threshold, the charge of the low-voltage battery cannot fuse the fuse between the vehicle-mounted charging device and the low-voltage battery.
It can be seen that, when low voltage battery breaks away from insufficient voltage state, if on-vehicle charging equipment broke down, low voltage battery can provide the fuse between electric quantity fusing on-vehicle charging equipment and the low voltage battery, in time breaks away from the on-vehicle charging equipment and the low voltage battery of trouble, consequently can not lead to the low voltage battery to fall the power, has effectively promoted the security performance of vehicle.
In yet another alternative, the charging unit 303 is specifically configured to control the vehicle-mounted charging apparatus to charge the low-voltage battery for a target time period to enable the low-voltage battery to be out of the power-deficient state, where the target time period is a preset time period or a time period determined according to one or more of a power consumption amount of the low-voltage battery per unit time, a charging amount of the vehicle-mounted charging apparatus per unit time, and a preset target power amount.
It can be seen that specifically, the target charging duration for the low-voltage storage battery is the preset charging duration for the low-voltage storage battery, that is, the low-voltage storage battery is considered to be separated from the power-shortage state, rather than continuously detecting whether the vehicle is in the power-shortage state in real time, so that the large calculation overhead caused by multiple detections is avoided, and the service life of the related circuit is also avoided being shortened due to multiple detections.
In yet another alternative, the vehicle includes a voltage detection circuit and a signal transmission circuit; the VCU300 further includes:
the receiving unit is used for receiving a signal which is sent by the signal transmission circuit and is used for representing that the low-voltage storage battery is in the insufficient state before the determining unit 301 determines that the low-voltage storage battery is in the insufficient state, wherein the signal which is used for representing that the low-voltage storage battery is in the insufficient state is obtained by the voltage detection circuit.
In yet another alternative, the vehicle-mounted charging device is a DCDC, and the voltage detection circuit and the signal transmission circuit are configured in the DCDC.
Therefore, the voltage detection circuit and the signal transmission circuit can be configured in the DCDC, on one hand, some lines in the DCDC can be multiplexed, and the circuit is prevented from being too complex; on the other hand, because the design is in the DCDC, the space except the DCDC is not required to be occupied, and the space utilization rate of the device is improved.
In still another alternative, the voltage at which the on-vehicle charging apparatus charges the low-voltage battery when the travel speed of the vehicle is limited is smaller than the voltage at which the on-vehicle charging apparatus charges the low-voltage battery when the travel speed of the vehicle is not limited. Therefore, the situation that the battery is damaged or the service life of the battery is reduced due to overlarge charging current when the low-voltage storage battery is in a serious insufficient state can be avoided.
It should be noted that the implementation of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 2.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another VCU provided in the embodiment of the present application, where the VCU is in a vehicle, and the vehicle further includes a low-voltage battery, a motor controller, and an onboard charging device. The VCU400 may include a processor 401, a memory 402, and a communication interface 403, the processor 401, the memory 402, and the communication interface 403 being connected to each other by a bus.
The memory 402 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM). The memory 402 is used for storing related computer programs and data. The communication interface 403 is used for receiving and transmitting data.
Processor 401 may be one or more Central Processing Units (CPUs). In the case where the processor 401 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.
The processor 401 in the VCU400 may be configured to read the computer program code stored in the memory 402, and perform the following operations:
determining that the low-voltage battery is in a power-deficient state;
configuring the motor controller to limit a travel speed of the vehicle;
controlling the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be separated from the power shortage state;
the motor controller is configured to release the restriction on the traveling speed of the vehicle.
In an alternative, the power shortage state is a state in which the charge of the low-voltage battery is less than a preset threshold.
In yet another alternative, when the charge of the low-voltage battery is less than a preset threshold, the charge of the low-voltage battery cannot fuse the fuse between the vehicle-mounted charging device and the low-voltage battery.
In another optional scheme, processor 401 controls the vehicle-mounted charging device to charge the low-voltage battery, so that when the low-voltage battery is out of the power-deficient state, specifically:
and controlling the vehicle-mounted charging equipment to charge the low-voltage storage battery for a target time length so as to enable the low-voltage storage battery to be separated from the power shortage state, wherein the target time length is a preset time length or a time length determined according to one or more of the power consumption of the low-voltage storage battery in unit time, the charging amount of the vehicle-mounted charging equipment in unit time and a preset target electric quantity.
In yet another alternative, the vehicle includes a voltage detection circuit and a signal transmission circuit; before the determination that the low-voltage storage battery is in the insufficient-power state, the processor 401 is further configured to:
and receiving the signal which is sent by the signal transmission circuit and indicates that the low-voltage storage battery is in the signal of the power-down state, wherein the signal which indicates that the low-voltage storage battery is in the power-down state is obtained by the voltage detection circuit.
In yet another alternative, the vehicle-mounted charging device is a DCDC, and the voltage detection circuit and the signal transmission circuit are configured in the DCDC.
In still another alternative, the voltage at which the on-vehicle charging apparatus charges the low-voltage battery when the travel speed of the vehicle is limited is smaller than the voltage at which the on-vehicle charging apparatus charges the low-voltage battery when the travel speed of the vehicle is not limited.
It should be noted that the implementation of each operation may also correspond to the corresponding description of the method embodiment shown in fig. 2.
An embodiment of the present application further provides a chip system, where the chip system includes at least one processor, a memory and an interface circuit, where the memory, the interface circuit, and the at least one processor are interconnected by a line, and a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the operations executed in the embodiment shown in fig. 2 are implemented.
Embodiments of the present application also provide a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed on a processor, the computer program implements the operations performed in the embodiments shown in fig. 2.
Embodiments of the present application also provide a computer program product, which when executed on a processor, implements the operations performed in the embodiments shown in fig. 2.
One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments can be implemented by hardware associated with a computer program that can be stored in a computer-readable storage medium, and when executed, can include the processes of the above method embodiments. And the aforementioned storage medium includes: various media that can store computer program code, such as ROM or RAM, magnetic or optical disks, etc.

Claims (15)

1. A low-voltage storage battery charging method is applied to a vehicle, wherein the vehicle comprises a vehicle control unit, a low-voltage storage battery, a motor controller and a vehicle-mounted charging device, and the method comprises the following steps:
the vehicle control unit determines that the low-voltage storage battery is in a power-shortage state;
the vehicle control unit configures the motor controller to limit the driving speed of the vehicle;
the vehicle controller controls the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be separated from the power shortage state;
the vehicle control unit configures the motor controller to release the restriction on the traveling speed of the vehicle.
2. The method according to claim 1, wherein the power-down state is a state in which the charge of the low-voltage battery is less than a preset threshold.
3. The method according to claim 1 or 2, wherein the vehicle control unit controls the vehicle-mounted charging device to charge the low-voltage battery so as to remove the low-voltage battery from the power-deficient state, and comprises:
the vehicle control unit controls the vehicle-mounted charging equipment to charge the low-voltage storage battery for a target time length so as to enable the low-voltage storage battery to be separated from the power shortage state, wherein the target time length is a preset time length or a time length determined according to one or more of power consumption of the low-voltage storage battery in unit time, charging capacity of the vehicle-mounted charging equipment in unit time and preset target power.
4. The method of any one of claims 1-3, wherein the vehicle further comprises a voltage detection circuit and a signal transmission circuit; before the vehicle control unit determines that the low-voltage battery is in a power-shortage state, the method further comprises the following steps:
and receiving the signal which is sent by the signal transmission circuit and indicates that the low-voltage storage battery is in the signal of the power-down state, wherein the signal which indicates that the low-voltage storage battery is in the power-down state is obtained by the voltage detection circuit.
5. The method according to claim 4, wherein the vehicle-mounted charging apparatus is a direct current converter (DCDC), and the voltage detection circuit and the signal transmission circuit are configured in the DCDC.
6. The method according to any one of claims 1 to 5, wherein the voltage at which the on-board charging device charges the low-voltage battery when the travel speed of the vehicle is limited is smaller than the voltage at which the on-board charging device charges the low-voltage battery when the travel speed of the vehicle is not limited.
7. The vehicle control unit is characterized by being arranged in a vehicle, and the vehicle further comprises a low-voltage storage battery, a motor controller and vehicle-mounted charging equipment; the vehicle control unit comprises:
a determination unit for determining that the low-voltage battery is in a state of insufficient power;
a first configuration unit configured to configure the motor controller to limit a traveling speed of the vehicle;
the charging unit is used for controlling the vehicle-mounted charging equipment to charge the low-voltage storage battery so as to enable the low-voltage storage battery to be separated from the power shortage state;
a second configuration unit configured to configure the motor controller to release a restriction on a traveling speed of the vehicle.
8. The vehicle control unit according to claim 7, wherein the power shortage state is a state where the charge of the low-voltage battery is less than a preset threshold.
9. The vehicle control unit according to claim 7 or 8, wherein the charging unit is specifically configured to control the vehicle-mounted charging device to charge the low-voltage battery for a target time period to bring the low-voltage battery out of the power-deficient state, wherein the target time period is a preset time period or a time period determined according to one or more of a power consumption amount of the low-voltage battery per unit time, a charging amount of the vehicle-mounted charging device per unit time, and a preset target power amount.
10. The vehicle control unit of any one of claims 7-9, wherein the vehicle further comprises a voltage detection circuit and a signal transmission circuit; the vehicle control unit further comprises:
and the receiving unit is used for receiving a signal which is sent by the signal transmission circuit and is used for representing that the low-voltage storage battery is in the insufficient state before the determining unit determines that the low-voltage storage battery is in the insufficient state, wherein the signal which is used for representing that the low-voltage storage battery is in the insufficient state is acquired by the voltage detection circuit.
11. The vehicle control unit according to claim 10, wherein the vehicle-mounted charging device is DCDC, and the voltage detection circuit and the signal transmission circuit are disposed in the DCDC.
12. The vehicle control unit according to any one of claims 7-11, wherein the voltage at which the vehicle-mounted charging device charges the low-voltage battery when the traveling speed of the vehicle is limited is smaller than the voltage at which the vehicle-mounted charging device charges the low-voltage battery when the traveling speed of the vehicle is not limited.
13. A vehicle control unit, characterized in that the vehicle control unit is in a vehicle, the vehicle control unit comprising a communication interface, a processor and a memory for storing a computer program, the processor invoking the computer program for performing the method according to any one of claims 1-6.
14. A vehicle, characterized in that the vehicle comprises a vehicle control unit according to any one of claims 7 to 12.
15. A computer storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the method of any one of claims 1-6.
CN202010240079.0A 2020-03-30 2020-03-30 Low-voltage storage battery charging method and controller Active CN111452745B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202010240079.0A CN111452745B (en) 2020-03-30 2020-03-30 Low-voltage storage battery charging method and controller
CN202210629756.7A CN115009196A (en) 2020-03-30 2020-03-30 Vehicle control method and controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010240079.0A CN111452745B (en) 2020-03-30 2020-03-30 Low-voltage storage battery charging method and controller

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CN202210629756.7A Division CN115009196A (en) 2020-03-30 2020-03-30 Vehicle control method and controller

Publications (2)

Publication Number Publication Date
CN111452745A true CN111452745A (en) 2020-07-28
CN111452745B CN111452745B (en) 2022-06-14

Family

ID=71673527

Family Applications (2)

Application Number Title Priority Date Filing Date
CN202010240079.0A Active CN111452745B (en) 2020-03-30 2020-03-30 Low-voltage storage battery charging method and controller
CN202210629756.7A Pending CN115009196A (en) 2020-03-30 2020-03-30 Vehicle control method and controller

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN202210629756.7A Pending CN115009196A (en) 2020-03-30 2020-03-30 Vehicle control method and controller

Country Status (1)

Country Link
CN (2) CN111452745B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112060911A (en) * 2020-09-07 2020-12-11 东风汽车集团有限公司 Low-voltage power supply abnormal driving control method, device and medium for new energy automobile
CN112531826A (en) * 2020-11-25 2021-03-19 北京车和家信息技术有限公司 Vehicle-mounted low-voltage storage battery charging method and device and vehicle
CN112721833A (en) * 2021-01-04 2021-04-30 宝能(西安)汽车研究院有限公司 Vehicle low-voltage power supply voltage monitoring method and system, storage medium and vehicle
CN113799610A (en) * 2021-09-06 2021-12-17 华人运通(江苏)技术有限公司 Vehicle redundancy control method and device and vehicle
CN114248709A (en) * 2021-12-09 2022-03-29 北京经纬恒润科技股份有限公司 Energy management method and device for low-pressure electrical system of fuel vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1767310A (en) * 2005-11-18 2006-05-03 上海燃料电池汽车动力***有限公司 Remanent electric quantity closed-loop controlling method for vehicle-carried auxiliary power accumulator set
US20140002021A1 (en) * 2012-06-28 2014-01-02 Kevin I. Bertness Hybrid and electric vehicle battery pack maintenance device
CN106004446A (en) * 2016-05-31 2016-10-12 北京现代汽车有限公司 Charge control method and system for low-voltage storage battery of electric automobile, and vehicle control unit
CN107458332A (en) * 2017-07-27 2017-12-12 北京新能源汽车股份有限公司 Low-voltage battery power supplementing method and system, controller and automobile
CN108263214A (en) * 2016-12-30 2018-07-10 北京汽车集团有限公司 A kind of energy control method and device of mixed power electric car low tension battery
CN109474039A (en) * 2018-12-21 2019-03-15 北京新能源汽车股份有限公司 Direct current converter DCDC voltage regulation control method, device, equipment and automobile

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1767310A (en) * 2005-11-18 2006-05-03 上海燃料电池汽车动力***有限公司 Remanent electric quantity closed-loop controlling method for vehicle-carried auxiliary power accumulator set
US20140002021A1 (en) * 2012-06-28 2014-01-02 Kevin I. Bertness Hybrid and electric vehicle battery pack maintenance device
CN106004446A (en) * 2016-05-31 2016-10-12 北京现代汽车有限公司 Charge control method and system for low-voltage storage battery of electric automobile, and vehicle control unit
CN108263214A (en) * 2016-12-30 2018-07-10 北京汽车集团有限公司 A kind of energy control method and device of mixed power electric car low tension battery
CN107458332A (en) * 2017-07-27 2017-12-12 北京新能源汽车股份有限公司 Low-voltage battery power supplementing method and system, controller and automobile
CN109474039A (en) * 2018-12-21 2019-03-15 北京新能源汽车股份有限公司 Direct current converter DCDC voltage regulation control method, device, equipment and automobile

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112060911A (en) * 2020-09-07 2020-12-11 东风汽车集团有限公司 Low-voltage power supply abnormal driving control method, device and medium for new energy automobile
CN112531826A (en) * 2020-11-25 2021-03-19 北京车和家信息技术有限公司 Vehicle-mounted low-voltage storage battery charging method and device and vehicle
CN112721833A (en) * 2021-01-04 2021-04-30 宝能(西安)汽车研究院有限公司 Vehicle low-voltage power supply voltage monitoring method and system, storage medium and vehicle
CN113799610A (en) * 2021-09-06 2021-12-17 华人运通(江苏)技术有限公司 Vehicle redundancy control method and device and vehicle
CN113799610B (en) * 2021-09-06 2023-12-26 华人运通(江苏)技术有限公司 Vehicle redundancy control method and device and vehicle
CN114248709A (en) * 2021-12-09 2022-03-29 北京经纬恒润科技股份有限公司 Energy management method and device for low-pressure electrical system of fuel vehicle

Also Published As

Publication number Publication date
CN115009196A (en) 2022-09-06
CN111452745B (en) 2022-06-14

Similar Documents

Publication Publication Date Title
CN111452745B (en) Low-voltage storage battery charging method and controller
CN107662499B (en) Pure electric vehicle complete vehicle fault power-off control method and system
KR101755894B1 (en) Apparatus for preventing over discharge of vehicle battery and method thereof
KR101673822B1 (en) Apparatus and method for detecting relay welding in green car
JP2002200948A (en) Vehicular power distribution device
CN110871687A (en) Power supply system for vehicle
CN103863126A (en) Power control apparatus for vehicle battery
US11830999B2 (en) Hybrid energy storage module system having auxiliary battery
CN102555812A (en) Energy control system and energy control method of electric automobile
EP3696008B1 (en) Vehicle power supply system, and vehicle
US11345255B2 (en) Emergency electric power supply system, emergency electric power supply method, and storage medium
US10647204B2 (en) Electric energy management system, management device for energy storage device, energy storage apparatus and electric energy management method for vehicle
EP3075050A1 (en) Traction voltage system in a vehicle and method for controlling such a system
US7235897B2 (en) Power supply unit for automobiles, which can provide braking force even when abnormality occurs in the power supply unit of electrically driven brake devices
KR101887748B1 (en) System for protecting battery from over-charge for vehicle and the controlling method
CN110341487B (en) Control method and system for controlling brake resistor of new energy vehicle
CN110053497A (en) A kind of movable charging vehicle charging system
JP7398234B2 (en) In-vehicle communication system and power supply control method
KR101187449B1 (en) two direction regenerative braking control method of electric vehicle with non contact electromagnetic inductive charging
KR20180023327A (en) Power supply apparatus for electric field load in eco-vehicle
JP2005229706A (en) Controller for vehicle
CN209581169U (en) A kind of electric car and its drive system and driving device
CN110509790B (en) Wireless charging system, vehicle-mounted charging device and new energy automobile
CN217198029U (en) Automobile storage battery insufficient-power protection system and automobile storage battery insufficient-power protection box
KR102518100B1 (en) Capacitor power bank system with charging function of electric vehicle

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right

Effective date of registration: 20211110

Address after: 518043 No. 01, 39th floor, building a, antuoshan headquarters building, No. 33, antuoshan Sixth Road, Xiang'an community, Xiangmihu street, Futian District, Shenzhen, Guangdong Province

Applicant after: Huawei Digital Energy Technology Co., Ltd

Address before: 518129 Huawei headquarters office building, Bantian, Longgang District, Shenzhen, Guangdong

Applicant before: Huawei Technology Co., Ltd

TA01 Transfer of patent application right
GR01 Patent grant
GR01 Patent grant