CN106080239A - Low-voltage storage battery charging control method of electric vehicle and electric vehicle - Google Patents
Low-voltage storage battery charging control method of electric vehicle and electric vehicle Download PDFInfo
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- CN106080239A CN106080239A CN201610515448.6A CN201610515448A CN106080239A CN 106080239 A CN106080239 A CN 106080239A CN 201610515448 A CN201610515448 A CN 201610515448A CN 106080239 A CN106080239 A CN 106080239A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
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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
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- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a low-voltage storage battery charging control method of an electric vehicle, wherein the electric vehicle comprises a high-voltage power supply, a low-voltage storage battery and a power converter, the power converter is respectively connected with the high-voltage power supply and the low-voltage storage battery, and the charging control method comprises the following steps: the method comprises the steps that a vehicle control unit of the electric vehicle detects the current running mode of the electric vehicle, wherein the running mode comprises a driving mode and a parking mode; if the electric vehicle is in a parking mode, the vehicle controller acquires electric quantity information of the low-voltage storage battery at preset time intervals after the high-voltage power supply stops high-voltage output; when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value, the vehicle control unit controls the power converter to be started so as to convert high-voltage electricity into low-voltage electricity to charge the low-voltage storage battery. The low-voltage storage battery charging control method can reduce the risk of electricity shortage of the low-voltage storage battery when the electric vehicle is in a parking mode. The invention also discloses an electric vehicle.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to a low-voltage storage battery charging control method of an electric vehicle and the electric vehicle.
Background
The electric vehicle comprises a high-voltage vehicle-mounted power supply system and a low-voltage vehicle-mounted power supply system, wherein the high-voltage power supply system is mainly used for providing driving power for the whole vehicle, and the low-voltage power supply system is mainly used for providing power output for low-voltage electric appliances of the whole vehicle. The voltage class of the current low-voltage power supply system is usually 12V or 24V, and the most common low-voltage power supply system is a lead-acid storage battery.
In the normal running process of the whole vehicle, a vehicle-mounted power supply conversion module such as a power supply converter is usually started to output low voltage, and the output low voltage supplies power to a whole vehicle low-voltage system on one hand and charges a low-voltage storage battery on the other hand; in the process of laying or charging the whole vehicle, the low-voltage storage battery outputs low voltage, and part of low-voltage electric appliances of the whole vehicle work normally. There is a risk of underrun of the low-voltage battery in the event of a parking, in particular if the vehicle is left standing for a long time.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, the present invention is directed to a low-voltage battery charging control method for an electric vehicle, which can reduce the risk of a low-voltage battery being short of electricity when the vehicle is parked.
The invention further provides an electric vehicle.
In order to solve the above problem, a low-voltage battery charging control method of an electric vehicle according to an aspect of the present invention, wherein the electric vehicle includes a high-voltage power supply, a low-voltage battery, and a power converter connected to the high-voltage power supply and the low-voltage battery, respectively, includes: the method comprises the steps that a vehicle control unit of the electric vehicle detects the current operation mode of the electric vehicle, wherein the operation mode comprises a driving mode and a parking mode; if the electric vehicle is in the parking mode, the vehicle control unit acquires electric quantity information of the low-voltage storage battery at preset time intervals after the high-voltage power supply stops outputting high voltage; when the electric quantity of the low-voltage storage battery is lower than a charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert high-voltage electricity into low-voltage electricity to charge the low-voltage storage battery.
According to the low-voltage storage battery charging control method of the electric vehicle, when the electric vehicle is in a parking mode, after a high-voltage power supply stops high-voltage output, the vehicle control unit acquires electric quantity information of the low-voltage storage battery at preset time intervals, and when the electric quantity of the low-voltage storage battery is lower than a charging lower limit threshold, the power converter is controlled to be started to charge the low-voltage storage battery, so that the electric quantity of the low-voltage storage battery is sufficient when the electric vehicle is parked, particularly when the electric vehicle is parked for a long time, the risk of power shortage is reduced to influence normal work of the vehicle, and the service life of the low-voltage.
The electric vehicle further includes a timer, and if the electric vehicle is in the parking mode, the vehicle controller acquires the electric quantity information of the low-voltage battery at preset intervals after the high-voltage power supply stops outputting the high voltage, and further includes: if the electric vehicle is in the parking mode, after the high-voltage power supply stops outputting high voltage, the vehicle control unit sends a timing instruction to the timer so that the timer starts timing, and the vehicle control unit enters a sleep state; and
and when the timing time of the timer reaches the preset time, the vehicle control unit is awakened after receiving the awakening instruction of the timer, and then the high-voltage power supply is controlled to output and the electric quantity information of the low-voltage storage battery is acquired.
In particular, the timer comprises a data acquisition unit DAU.
When the electric quantity of the low-voltage storage battery is lower than the lower charging limit threshold, the vehicle control unit controls the power converter to start so as to convert high-voltage electricity into low-voltage electricity to charge the low-voltage storage battery, and the vehicle control unit further comprises: when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert the high-voltage electricity output by the high-voltage power supply into low-voltage electricity to charge the low-voltage storage battery; or when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert high-voltage electricity of an external power supply into low-voltage electricity to charge the low-voltage storage battery.
Further, the charge control method further includes: when the electric quantity of the low-voltage storage battery reaches a charging upper limit threshold value, the vehicle control unit controls the power converter to stop charging the low-voltage storage battery and controls the high-voltage power supply to stop outputting; and the vehicle control unit enters a dormant state.
In addition, the charge control method further includes: if the electric vehicle is in the driving mode, the vehicle control unit acquires the electric quantity information of the low-voltage storage battery in real time; and when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert the high-voltage electricity output by the high-voltage power supply into low-voltage electricity, so that the low-voltage storage battery is charged, the power shortage risk of the low-voltage storage battery during driving can be reduced, and the service life of the low-voltage storage battery is ensured.
Further, the charge control method further includes: and when the electric quantity of the low-voltage storage battery reaches the upper charging limit threshold value, the vehicle control unit controls the power converter to stop charging the low-voltage storage battery.
In order to solve the above problems, another aspect of the present invention provides an electric vehicle including a high voltage power supply for supplying driving power to the electric vehicle; the low-voltage storage battery is used for providing power supply for low-voltage electric appliances of the electric vehicle; the electric quantity detector is used for detecting the electric quantity of the low-voltage storage battery; the power converter is respectively connected with the high-voltage power supply and the low-voltage storage battery; the vehicle control unit detects a current running mode of an electric vehicle, wherein the running mode comprises a driving mode and a parking mode, when the electric vehicle is in the parking mode and after the high-voltage power supply stops high-voltage output, the vehicle control unit acquires electric quantity information of the low-voltage storage battery at preset time intervals, and controls the power converter to start to convert high-voltage electricity into low-voltage electricity to charge the low-voltage storage battery when the electric quantity of the low-voltage storage battery is lower than a charging lower limit threshold value.
According to the electric vehicle provided by the embodiment of the invention, after the electric vehicle is in a parking mode and the high-voltage power supply stops high-voltage output, the vehicle control unit acquires the electric quantity information of the low-voltage storage battery at intervals of preset time, and controls the power converter to start to charge the low-voltage storage battery when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold, so that the electric quantity of the low-voltage storage battery is sufficient when the electric vehicle is parked, particularly when the electric vehicle is parked for a long time, the risk of power shortage is reduced to influence the normal work of the vehicle, and the service.
Further, the electric vehicle further includes: the whole vehicle controller sends a timing instruction to the timer to start the timer to time when the electric vehicle is in the parking mode and the high-voltage power supply stops high-voltage output, enters a dormant state, receives a wake-up instruction of the timer when the timing time of the timer reaches the preset time, and controls the high-voltage power supply to output and acquire the electric quantity information of the low-voltage storage battery after the whole vehicle controller is woken up.
In particular, the timer comprises a data acquisition unit ADU.
The vehicle control unit controls the power converter to start so as to convert high voltage output by the high voltage power supply into low voltage power, or controls the power converter to start so as to convert high voltage output by an external power supply into low voltage power, so as to charge the low voltage storage battery.
Further, the vehicle control unit is further configured to control the power converter to stop charging the low-voltage battery and control the high-voltage power supply to stop outputting when the electric quantity of the low-voltage battery reaches an upper charging threshold, and the vehicle control unit enters a sleep state.
In addition, the vehicle control unit is also used for acquiring the electric quantity information of the low-voltage storage battery in real time when the electric vehicle is in a driving mode, and controlling the power converter to start to convert the high-voltage electricity output by the high-voltage power supply into low-voltage electricity when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value so as to charge the low-voltage storage battery, thereby reducing the risk of electricity shortage of the low-voltage storage battery during driving and prolonging the service life of the low-voltage storage battery.
Further, the vehicle control unit is further configured to control the power converter to stop charging the low-voltage battery when the electric quantity of the low-voltage battery reaches an upper charging limit threshold.
Drawings
Fig. 1 is a flowchart of a low-voltage battery charge control method of an electric vehicle according to an embodiment of the invention;
FIG. 2 is a flow chart of a low-voltage battery charge control method of an electric vehicle in a park mode according to an embodiment of the present invention;
fig. 3 is a flowchart of a low-voltage battery charge control method of an electric vehicle according to another embodiment of the invention;
FIG. 4 is a flow chart of a low-voltage battery charge control method of an electric vehicle in a drive mode according to another embodiment of the present invention;
FIG. 5 is a block diagram of an electric vehicle according to an embodiment of the invention; and
fig. 6 is a block diagram of an electric vehicle according to another embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A low-voltage battery charge control method of an electric vehicle and the electric vehicle proposed according to an embodiment of the invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a low-voltage battery charge control method of an electric vehicle according to an embodiment of the present invention, in which the electric vehicle includes a high-voltage power supply such as a power battery for supplying driving power to a vehicle, a low-voltage battery for supplying low-voltage power to low-voltage electric appliances of the electric vehicle such as a cooling system, a vacuum system, and the like, and a power converter such as a DC/DC converter for converting a power supply voltage such as a low voltage into a high voltage or a high voltage into a low voltage, respectively connected to the high-voltage power supply and the low-voltage battery.
As shown in fig. 1, the low-voltage battery charge control method of the electric vehicle includes the steps of:
s1, the vehicle control unit of the electric vehicle detects the current running mode of the electric vehicle, wherein the running mode comprises a running mode and a parking mode. For example, the vehicle controller obtains driving state data of each sensor or the auxiliary controller, such as key information, a vehicle speed signal, a wheel speed signal and a brake signal, through a CAN network of the vehicle, and then determines whether the current electric vehicle is in a driving mode or a parking mode according to the driving state data, for example, when the key is started, the vehicle speed is not zero, no brake signal exists, and the wheel speed is not zero, it may be determined that the electric vehicle is driving, otherwise, the electric vehicle is in the parking state.
And S2, if the electric vehicle is in a parking mode, after the high-voltage power supply stops high-voltage output, namely after the whole vehicle is powered off at high voltage, the whole vehicle controller acquires the electric quantity information of the low-voltage storage battery at preset time intervals.
Generally, after the whole vehicle is powered off at a high voltage, the whole vehicle controller also enters a sleep state, so in the embodiment of the invention, the whole vehicle controller CAN be awakened once every preset time, and then the whole vehicle controller acquires the electric quantity information of the low-voltage storage battery through the CAN bus.
In one embodiment of the invention, the electric vehicle further comprises a timer, if the electric vehicle is in a parking mode, after the high-voltage power supply stops high-voltage output, the vehicle control unit sends a timing instruction to the timer so that the timer starts timing, and the vehicle control unit enters a sleep state; when the timing time of the timer reaches the preset time, the vehicle control unit is awakened after receiving the awakening instruction of the timer, and then the high-voltage power supply is controlled to output and the electric quantity information of the low-voltage storage battery is obtained.
Specifically, the timer includes a data acquisition unit DAU (digital acquisition unit), and the data acquisition unit DAU has a clock function and can send a wake-up signal to the vehicle control unit.
And S3, when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold, the vehicle control unit controls the power converter to start so as to convert the high-voltage electricity into low-voltage electricity to charge the low-voltage storage battery.
The vehicle control unit judges whether the low-voltage storage battery needs to be charged according to the electric quantity of the low-voltage storage battery so as to avoid the phenomenon of power shortage of the low-voltage storage battery, and especially when the vehicle is placed for a long time, normal supply of low voltage of the vehicle is ensured. When the electric quantity of the low-voltage storage battery is lower than the lower charging limit threshold, the low-voltage storage battery needs to be charged, otherwise, the low-voltage storage battery is about to have a power shortage problem, and the vehicle control unit controls a power converter such as a DC/DC converter to be started so as to convert the high-voltage power into the low-voltage power such as 12V or 24V voltage, so that the low-voltage storage battery is charged.
Specifically, when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold, the vehicle control unit may control the power converter to start up to convert the high-voltage power output by the high-voltage power supply into low-voltage power to charge the low-voltage storage battery; or when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold, the vehicle control unit can control the power converter to start so as to convert the high voltage of the external power supply into low voltage to charge the low-voltage storage battery. Generally speaking, when the electric vehicle is in a parking mode, if the low-voltage storage battery needs to be charged, the vehicle control unit controls the converter to start so as to convert the high-voltage power, such as 380V, of the high-voltage power supply or the external power supply into the low-voltage power, such as 12V, so as to supply the low-voltage storage battery, ensure that the electric quantity of the low-voltage storage battery is sufficient to avoid the phenomenon of insufficient power, influence the starting of the electric vehicle and shorten the service life of the low-voltage storage.
It can be seen that, according to the method for controlling charging of a low-voltage battery of an electric vehicle in the embodiment of the present invention, when the electric vehicle is in a parking mode, after a high-voltage power supply stops outputting a high voltage, a vehicle controller obtains information of an electric quantity of the low-voltage battery at preset intervals, and when the electric quantity of the low-voltage battery is lower than a charging lower limit threshold, a power converter is controlled to start to charge the low-voltage battery, so that it can be ensured that the electric quantity of the low-voltage battery is sufficient when the electric vehicle is parked, especially when the electric vehicle is parked for a long time, a risk of power shortage is reduced to affect normal operation of.
Further, when the electric quantity of the low-voltage storage battery reaches the upper charging limit threshold, the vehicle control unit controls the power converter to stop charging the low-voltage storage battery and controls the high-voltage power supply to stop outputting so as to ensure that the electric quantity of the low-voltage storage battery is in a better state, and the vehicle control unit enters a dormant state.
Fig. 2 is a flowchart of a low-voltage battery charging control when the electric vehicle is in a parking mode according to an embodiment of the present invention, as shown in fig. 2, the method including:
and S110, when the electric vehicle is electrified under high voltage, the VCU sends a timing instruction to the DAU.
And S120, timing by the data acquisition unit ADU, and starting timing after the data acquisition unit ADU receives the timing instruction.
And S130, judging whether the timing time of the data acquisition unit ADU reaches the preset time, if so, entering the step S140, otherwise, returning to the step S120.
S140, the data acquisition unit ADU wakes up the VCU of the vehicle control unit, and the vehicle control unit controls the electric vehicle to be powered on at high voltage.
And S150, judging whether the electric quantity of the low-voltage storage battery is lower than a charging lower limit threshold, if so, entering the step S160, otherwise, returning to the step S110.
And S160, controlling the DC/DC converter to convert the high voltage output by the power battery or the high voltage of the external power supply into low voltage to charge the low-voltage storage battery.
And S170, judging whether the electric quantity of the low-voltage storage battery reaches the upper charging limit threshold, if so, entering the step S180, otherwise, returning to the step S160.
And S180, stopping charging the low-voltage storage battery by the DC/DC converter, enabling the whole vehicle controller to enter a dormant state, and returning to the step S110.
It can be seen that, in the charging control process of the low-voltage battery in the parking mode, the main table quantitatively includes the timing time of the data acquisition unit ADU, the charging lower limit threshold of the low-voltage battery, and the charging upper limit threshold of the low-voltage battery.
In short, the method for controlling the charging of the low-voltage storage battery of the electric vehicle can reduce the power shortage risk of the low-voltage storage battery when the electric vehicle is parked, particularly when the electric vehicle is parked for a long time, prolong the service life of the low-voltage storage battery, and has low cost and high safety.
On the other hand, the method for controlling the charging of the low-voltage storage battery of the electric vehicle can solve the problems of high energy consumption and low power consumption of the low-voltage storage battery of the electric vehicle in a driving mode, reduce the energy consumption of the whole vehicle and prolong the service life of the low-voltage storage battery.
Fig. 3 is a flowchart of a low-voltage battery charge control method of an electric vehicle according to another embodiment of the present invention, as shown in fig. 3, the charge control method further including:
and S4, if the electric vehicle is in the driving mode, the vehicle control unit acquires the electric quantity information of the low-voltage storage battery in real time.
And S5, when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold, the vehicle control unit controls the power converter to start to convert the high-voltage electricity output by the high-voltage power supply, such as 380V, into the low-voltage electricity, such as 12V, so as to charge the low-voltage storage battery. When the vehicle is driving, a high-voltage power supply such as a power battery is in high-voltage output, if the electric quantity of the low-voltage storage battery is lower than a charging lower limit threshold value, the DC/DC converter can be controlled to convert the output high-voltage electricity of the power battery into the low-voltage electricity required by the low-voltage storage battery, so that the low-voltage storage battery is charged, the risk of electricity shortage of the low-voltage storage battery during driving can be reduced, and the service life of the low-voltage storage battery is prolonged.
Further, when the electric quantity of the low-voltage storage battery reaches the upper charging limit threshold value, the vehicle control unit controls the power converter to stop charging the low-voltage storage battery.
Fig. 4 is a flowchart of a low-voltage battery charging control process of an electric vehicle in a driving mode according to another embodiment of the invention, as shown in fig. 4, the charging control process specifically includes:
s210, the electric vehicle is powered on at high voltage and is in a driving mode, and the VCU of the vehicle control unit monitors the voltage of the low-voltage storage battery.
And S220, judging whether the voltage of the low-voltage storage battery is lower than a charging lower limit threshold, if so, entering the step S230, otherwise, returning to the step S210.
And S230, controlling the DC/DC converter to convert the high-voltage electricity output by the power battery into low-voltage electricity so as to charge the low-voltage storage battery.
And S240, judging whether the voltage of the low-voltage storage battery reaches the upper charging limit threshold, if so, entering the step S250, and if not, returning to the step S230.
And S250, controlling the DC/DC converter to stop charging the low-voltage storage battery.
In summary, the method for controlling charging of the low-voltage battery of the electric vehicle according to the embodiment of the invention can reduce the risk of power shortage of the low-voltage battery when the electric vehicle is parked in a parking mode, especially when the electric vehicle is parked for a long time or is driving, and can prolong the service life of the low-voltage battery.
An electric vehicle according to another aspect of the embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 5 is a block diagram of an electric vehicle 100 according to an embodiment of the present invention, as shown in fig. 5, including a high-voltage power supply 10, a low-voltage battery 20, a power detector 30, a power converter 40, and a hybrid controller 50.
Among them, a high voltage power source 10, such as a power battery, is used to provide driving power for the electric vehicle 100; the low-voltage battery 20 is used to supply power to low-voltage electric appliances of the electric vehicle 100; the charge detector 30 is for detecting the charge of the low-voltage battery 20; the power converter 40 is respectively connected with the high-voltage power supply 10 and the low-voltage storage battery 20; the vehicle control unit 50 detects a current operation mode of the electric vehicle 100, wherein the operation mode includes a driving mode and a parking mode, and when the electric vehicle 100 is in the parking mode and after the high voltage power supply 10 stops outputting the high voltage, the vehicle control unit 50 acquires information of the electric quantity of the low voltage battery 20 at preset time intervals, and controls the power converter 40 to start to convert the high voltage power, for example 380V, into the low voltage power, for example 12V, to charge the low voltage battery 20 when the electric quantity of the low voltage battery 20 is lower than a lower charging limit threshold.
According to the electric vehicle 100 of the embodiment of the invention, after the vehicle is in the parking mode and the high-voltage power supply 10 stops high-voltage output, the vehicle control unit 50 acquires the electric quantity information of the low-voltage storage battery 20 at intervals of preset time, and controls the power converter 40 to start to charge the low-voltage storage battery 20 when the electric quantity of the low-voltage storage battery 20 is lower than the charging lower limit threshold, so that the electric vehicle 100 can be ensured to be fully charged by the low-voltage storage battery 20 when the vehicle is parked, particularly when the vehicle is parked for a long time, the risk of power shortage is reduced to influence normal operation of the vehicle, and the.
As shown in fig. 6, the electric vehicle 100 further includes a timer 60, the vehicle control unit 50 sends a timing command to the timer 60 to start timing by the timer 60 after the electric vehicle 100 is in the parking mode and the high voltage power supply 10 stops outputting the high voltage, and the vehicle control unit 50 enters the sleep state, and when the timing time of the timer 60 reaches a preset time, the vehicle control unit 50 receives a wake-up command of the timer 60, and controls the high voltage power supply 10 to output and obtain the power information of the low voltage battery 20 after being woken up.
Specifically, the timer 60 includes a data acquisition unit DAU having a clock function and capable of sending a wake-up signal to the vehicle control unit 50.
When the electric quantity of the low-voltage battery 20 is lower than the lower charging limit threshold, the vehicle control unit 50 may control the power converter 40 to start to convert the high voltage output by the high-voltage power supply 10 into the low voltage power, or the vehicle control unit 50 may control the power converter 40 to start to convert the high voltage output by the external power supply into the low voltage power, so as to charge the low-voltage battery 20.
Further, the vehicle controller 50 is further configured to control the power converter 40 to stop charging the low-voltage battery 20 and control the high-voltage power supply 10 to stop outputting when the electric quantity of the low-voltage battery 20 reaches the upper charging threshold, and the vehicle controller 50 enters the sleep state.
In addition, the electric vehicle 100 according to the embodiment of the present invention can also control the charging of the low-voltage battery 20 during traveling to reduce the risk of a power shortage of the low-voltage battery 20. Specifically, the vehicle control unit 50 obtains the power information of the low-voltage battery 20 in real time when the electric vehicle 100 is in the driving mode, and controls the power converter 40 to start to convert the high-voltage power output by the high-voltage power supply 10 into the low-voltage power to charge the low-voltage battery 20 when the power of the low-voltage battery 20 is lower than the charging lower threshold. When the vehicle is running, the high-voltage power supply 10, for example, a power battery, is in high-voltage output, and if the electric quantity of the low-voltage battery 20 is lower than the charging lower limit threshold, the DC/DC converter can be controlled to convert the output high-voltage electricity of the power battery into low-voltage electricity required by the low-voltage battery 20, so as to charge the low-voltage battery 20, thereby reducing the risk of power shortage of the low-voltage battery 20 during running, and prolonging the service life of the low-voltage battery 20.
Further, the vehicle control unit 50 controls the power converter 40 to stop charging the low-voltage battery 20 when the electric quantity of the low-voltage battery 20 reaches the upper charge limit threshold.
In summary, the electric vehicle 100 according to the embodiment of the present invention can realize the charge control of the low-voltage battery 20 in the parking mode, particularly, when the vehicle is parked for a long time or is driving, reduce the risk of power shortage of the low-voltage battery 20, prolong the service life of the low-voltage battery 20, and has low cost and high safety.
It should be noted that in the description of this specification, any process or method description in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and that the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (14)
1. A low-voltage battery charge control method of an electric vehicle, characterized in that the electric vehicle includes a high-voltage power supply, a low-voltage battery, and a power converter that is connected to the high-voltage power supply and the low-voltage battery, respectively, the charge control method comprising the steps of:
the method comprises the steps that a vehicle control unit of the electric vehicle detects the current operation mode of the electric vehicle, wherein the operation mode comprises a driving mode and a parking mode;
if the electric vehicle is in the parking mode, the vehicle control unit acquires electric quantity information of the low-voltage storage battery at preset time intervals after the high-voltage power supply stops outputting high voltage;
when the electric quantity of the low-voltage storage battery is lower than a charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert high-voltage electricity into low-voltage electricity to charge the low-voltage storage battery.
2. The low-voltage battery charging control method of an electric vehicle according to claim 1, wherein the electric vehicle further includes a timer, and the vehicle control unit acquires the charge amount information of the low-voltage battery every preset time after the high-voltage power supply stops the high-voltage output if the electric vehicle is in the parking mode, further comprising:
if the electric vehicle is in the parking mode, after the high-voltage power supply stops outputting high voltage, the vehicle control unit sends a timing instruction to the timer so that the timer starts timing, and the vehicle control unit enters a sleep state; and
and when the timing time of the timer reaches the preset time, the vehicle control unit is awakened after receiving an awakening instruction of the timer, and controls the high-voltage power supply to output and acquire the electric quantity information of the low-voltage storage battery.
3. The low-voltage battery charge control method of an electric vehicle according to claim 2, wherein said timer comprises a data acquisition unit DAU.
4. The low-voltage battery charging control method of an electric vehicle according to claim 2, wherein the vehicle control unit controls the power converter to be activated to convert a high voltage into a low voltage to charge the low-voltage battery when the charge of the low-voltage battery is lower than a lower charging limit threshold, further comprising:
when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert the high-voltage electricity output by the high-voltage power supply into low-voltage electricity to charge the low-voltage storage battery; or,
when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert high-voltage electricity of an external power supply into low-voltage electricity, and the low-voltage storage battery is charged.
5. The low-voltage battery charge control method of an electric vehicle according to claim 4, characterized by further comprising:
when the electric quantity of the low-voltage storage battery reaches a charging upper limit threshold value, the vehicle control unit controls the power converter to stop charging the low-voltage storage battery and controls the high-voltage power supply to stop outputting; and
and the vehicle control unit enters a dormant state.
6. The low-voltage battery charge control method of an electric vehicle according to claim 1, characterized by further comprising:
if the electric vehicle is in the driving mode, the vehicle control unit acquires the electric quantity information of the low-voltage storage battery in real time; and
when the electric quantity of the low-voltage storage battery is lower than the charging lower limit threshold value, the vehicle control unit controls the power converter to start so as to convert the high-voltage electricity output by the high-voltage power supply into low-voltage electricity to charge the low-voltage storage battery.
7. The low-voltage battery charge control method of an electric vehicle according to claim 6, characterized by further comprising:
and when the electric quantity of the low-voltage storage battery reaches the upper charging limit threshold value, the vehicle control unit controls the power converter to stop charging the low-voltage storage battery.
8. An electric vehicle, characterized by comprising:
a high voltage power supply for providing driving power to the electric vehicle;
the low-voltage storage battery is used for providing power supply for low-voltage electric appliances of the electric vehicle;
the electric quantity detector is used for detecting the electric quantity of the low-voltage storage battery;
the power converter is respectively connected with the high-voltage power supply and the low-voltage storage battery;
the vehicle control unit detects a current running mode of an electric vehicle, wherein the running mode comprises a driving mode and a parking mode, when the electric vehicle is in the parking mode and after the high-voltage power supply stops high-voltage output, the vehicle control unit acquires electric quantity information of the low-voltage storage battery at preset time intervals, and controls the power converter to start to convert high-voltage electricity into low-voltage electricity to charge the low-voltage storage battery when the electric quantity of the low-voltage storage battery is lower than a charging lower limit threshold value.
9. The electric vehicle of claim 8, characterized in that the electric vehicle further comprises:
the whole vehicle controller sends a timing instruction to the timer to start the timer to time when the electric vehicle is in the parking mode and the high-voltage power supply stops high-voltage output, enters a dormant state, receives a wake-up instruction of the timer when the timing time of the timer reaches the preset time, and controls the high-voltage power supply to output and acquire the electric quantity information of the low-voltage storage battery after the whole vehicle controller is woken up.
10. The electric vehicle of claim 9, characterized in that the timer comprises a data acquisition unit (ADU).
11. The electric vehicle of claim 9, wherein the vehicle control unit controls the power converter to start to convert the high voltage output by the high voltage power source into a low voltage power, or controls the power converter to start to convert the high voltage output by an external power source into a low voltage power to charge the low voltage battery.
12. The electric vehicle of claim 11, wherein the vehicle control unit is further configured to control the power converter to stop charging the low-voltage battery and control the high-voltage power supply to stop outputting when the charge of the low-voltage battery reaches an upper charging threshold, and the vehicle control unit enters a sleep state.
13. The electric vehicle of claim 8, wherein the vehicle control unit is further configured to obtain the charge information of the low-voltage battery in real time when the electric vehicle is in a driving mode, and control the power converter to start to convert the high-voltage power output by the high-voltage power supply into the low-voltage power to charge the low-voltage battery when the charge of the low-voltage battery is lower than the lower charging threshold.
14. The electric vehicle of claim 13, wherein the vehicle control unit is further configured to control the power converter to stop charging the low-voltage battery when the charge of the low-voltage battery reaches an upper charge threshold.
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| CN201610515448.6A CN106080239A (en) | 2016-07-01 | 2016-07-01 | Low-voltage storage battery charging control method of electric vehicle and electric vehicle |
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| CN201610515448.6A CN106080239A (en) | 2016-07-01 | 2016-07-01 | Low-voltage storage battery charging control method of electric vehicle and electric vehicle |
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