CN106080239A - The low tension battery charge control method of electric vehicle and electric vehicle - Google Patents

The low tension battery charge control method of electric vehicle and electric vehicle Download PDF

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Publication number
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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China
Prior art keywords
low tension
power supply
tension battery
electric vehicle
electricity
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CN201610515448.6A
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Chinese (zh)
Inventor
曹敏伟
张凯
马博
吴杰伟
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Beijing Electric Vehicle Co Ltd
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Beijing Electric Vehicle Co Ltd
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Priority to CN201610515448.6A priority Critical patent/CN106080239A/en
Publication of CN106080239A publication Critical patent/CN106080239A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60LPROPULSION 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
    • B60L58/00Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18Methods 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
    • B60L58/20Methods 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses the low tension battery charge control method of a kind of electric vehicle, wherein, electric vehicle includes high voltage power supply, low tension battery and power supply changeover device, power supply changeover device is connected with high voltage power supply and low tension battery respectively, charge control method comprises the following steps: the entire car controller of electric vehicle detects the operational mode that electric vehicle is current, wherein, operational mode includes drive mode and car-parking model;If electric vehicle is in car-parking model, then after high voltage power supply stops High voltage output, entire car controller obtains the information about power of low tension battery every Preset Time;When the electricity of low tension battery is less than charging lower threshold, vehicle control unit controls power supply changeover device starts so that high-tension electricity is converted to low tension, thinks that low tension battery charges.This low tension battery charge control method can reduce electric vehicle low tension battery when car-parking model and the risk of power shortage occurs.The invention also discloses a kind of electric vehicle.

Description

The low tension battery charge control method of electric vehicle and electric vehicle
Technical field
The invention belongs to technical field of vehicle, particularly relate to the low tension battery charge control method of a kind of electric vehicle, And one electric vehicle.
Background technology
Electric vehicle includes high pressure and two kinds of Vehicular power systems of low pressure, and wherein high voltage power supply is mainly used in providing whole The driving power of car, low voltage electric power system is then mainly used in the low-voltage electrical appliance to car load provides power supply output.Low pressure at present The electric pressure of power-supply system is usually 12V or 24V, and the most frequently used low voltage electric power system is lead-acid accumulator.
In the normal driving process of car load, it is common that started output by vehicle power modular converter such as power supply changeover device low Pressure, on the one hand the low pressure of output power for car load low-pressure system, on the other hand charges for low tension battery;And shelve at car load or In charging process, then it is to be exported low pressure by low tension battery, the now part low-voltage electrical appliance of car load often electricity work.So stopping Car easily produces the risk of low tension battery power shortage in the case of especially vehicle is shelved for a long time.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.
To this end, the present invention needs to propose the low tension battery charge control method of a kind of electric vehicle, this charging controlling party Method can reduce the risk of low tension battery generation power shortage when stopping.
The present invention also proposes a kind of electric vehicle.
In order to solve the problems referred to above, the low tension battery charge control method of the electric vehicle of one aspect of the present invention, wherein, Described electric vehicle includes high voltage power supply, low tension battery and power supply changeover device, described power supply changeover device respectively with described high pressure Power supply is connected with described low tension battery, and described charge control method comprises the following steps: the full-vehicle control of described electric vehicle The operational mode that device detection electric vehicle is current, wherein, described operational mode includes drive mode and car-parking model;If it is described Electric vehicle is in described car-parking model, then after described high voltage power supply stops High voltage output, described entire car controller every Preset Time obtains the information about power of described low tension battery;When the electricity of described low tension battery is less than charging lower threshold Time, power supply changeover device described in described vehicle control unit controls starts so that high-tension electricity is converted to low tension, thinks that described low pressure stores Battery charges.
The low tension battery charge control method of the electric vehicle of the embodiment of the present invention, is in car-parking model at electric vehicle Time, after high voltage power supply stops High voltage output, entire car controller obtains the information about power of low tension battery every Preset Time, And when the electricity of low tension battery is less than charging lower threshold, controls power supply changeover device startup and think that low tension battery charges, Thereby may be ensured that electric vehicle, in the especially low tension battery electricity abundance when shelving for a long time of stopping, reduces wind power shortage occur Danger is to affect normal vehicle operation, and ensures the service life of low tension battery.
Described electric vehicle also includes timer, if described electric vehicle is in described car-parking model, then at described height After voltage source stops High voltage output, described entire car controller obtains the electricity letter of described low tension battery every Preset Time Breath, farther includes: if described electric vehicle is in described car-parking model, then described high voltage power supply stop High voltage output it After, described entire car controller sends riming instructions to described timer so that described timer initiation timing, and described car load control Device processed enters resting state;And
When the timing time of described timer reaches described Preset Time, described entire car controller is receiving described meter Time device wake up instruction up after be waken up, then control described high voltage power supply output and obtain described low tension battery electricity letter Breath.
Specifically, described timer includes data acquisition unit DAU.
When the electricity of described low tension battery is less than charging lower threshold, power supply described in described vehicle control unit controls turns Parallel operation starts so that high-tension electricity is converted to low tension, thinks that described low tension battery charges, farther includes: when described low pressure stores When the electricity of battery is less than described charging lower threshold, described in described vehicle control unit controls, power supply changeover device starts with by described The high-tension electricity of high voltage power supply output is converted to low tension, thinks that described low tension battery charges;Or, when described low tension battery Electricity less than described charging lower threshold time, power supply changeover device described in described vehicle control unit controls starts with by external power supply High-tension electricity be converted to low tension, think that described low tension battery charges.
Further, above-mentioned charge control method also includes: when the electricity of described low tension battery reaches charging upper limit threshold During value, power supply changeover device described in described vehicle control unit controls stops charging for described low tension battery and controlling described high-tension electricity Source stops output;And, described entire car controller enters resting state.
It addition, above-mentioned charge control method also includes: if described electric vehicle is in described drive mode, the most described whole Vehicle controller obtains the information about power of described low tension battery in real time;And fill described in being less than when the electricity of described low tension battery During electricity lower threshold, power supply changeover device described in described vehicle control unit controls starts with the high-tension electricity described high voltage power supply exported Be converted to low tension, think that described low tension battery charges, such that it is able to reduce the power shortage risk of low tension battery when driving, Ensure the service life of low tension battery.
Further, above-mentioned charge control method also includes: when the electricity of described low tension battery reaches charging upper limit threshold During value, power supply changeover device described in described vehicle control unit controls stops charging for described low tension battery.
In order to solve the problems referred to above, the electric vehicle that another aspect of the present invention proposes, including: high voltage power supply, for for electric Motor-car provides and drives power;Low tension battery, provides power supply for the low-voltage electrical appliance for described electric vehicle;Electric power detection Device, for detecting the electricity of described low tension battery;Power supply changeover device, described power supply changeover device respectively with described high voltage power supply and Described low tension battery is connected;Entire car controller, the operational mode that described entire car controller detection electric vehicle is current, wherein, Described operational mode includes drive mode and car-parking model, when described electric vehicle is in car-parking model and at described high-tension electricity After source stops High voltage output, described entire car controller obtains the information about power of described low tension battery every Preset Time, and When the electricity of described low tension battery is less than charging lower threshold, controls described power supply changeover device and start to change high-tension electricity For low tension, think that described low tension battery charges.
The electric vehicle of the embodiment of the present invention, after being in car-parking model and high voltage power supply stopping High voltage output, car load Controller obtains the information about power of low tension battery every Preset Time, and when the electricity of low tension battery is less than charging lower limit threshold During value, control power supply changeover device startup and think that low tension battery charges, thereby may be ensured that electric vehicle is especially being grown in parking When phase shelves, low tension battery electricity is sufficient, reduces and the risk of power shortage occurs to affect normal vehicle operation, and ensures that low pressure stores The service life of battery.
Further, described electric vehicle also includes: timer, and described entire car controller is in institute at described electric vehicle State car-parking model and stop after High voltage output in described high voltage power supply, sending riming instructions to described timer so that described meter Time device start timing, and described entire car controller enters resting state, and reaches described pre-at the timing time of described timer If during the time, what described entire car controller received described timer wakes up instruction up, and controls described high-tension electricity after being woken Source exports and obtains the information about power of described low tension battery.
Specifically, described timer includes data acquisition unit ADU.
Wherein, power supply changeover device described in described vehicle control unit controls starts with the high-tension electricity described high voltage power supply exported Be converted to low tension, or, power supply changeover device described in described vehicle control unit controls starts to be turned by the high-tension electricity of external power supply It is changed to low tension, thinks that described low tension battery charges.
Further, described entire car controller is additionally operable to reach charging upper limit threshold value at the electricity of described low tension battery Time, control described power supply changeover device and stop charging for described low tension battery and controlling the stopping output of described high voltage power supply, and Described entire car controller enters resting state.
It addition, described entire car controller is additionally operable to when described electric vehicle is in drive mode, obtain described low in real time The information about power of pressure accumulator, and when the electricity of described low tension battery is less than described charging lower threshold, control described electricity Source converter starts so that the high-tension electricity that described high voltage power supply exports is converted to low tension, thinks that described low tension battery charges, Thus the risk of power shortage occurs in low tension battery when reducing driving, extend the service life of low tension battery.
Further, described entire car controller is additionally operable to reach charging upper limit threshold value at the electricity of described low tension battery Time, control described power supply changeover device and stop charging for described low tension battery.
Accompanying drawing explanation
Fig. 1 is the flow process of the low tension battery charge control method of electric vehicle according to an embodiment of the invention Figure;
Fig. 2 is the low tension battery charging under car-parking model of the electric vehicle of a specific embodiment according to the present invention The flow chart of control method;
Fig. 3 is the flow process of the low tension battery charge control method of electric vehicle according to another embodiment of the invention Figure;
Fig. 4 is that the electric vehicle of another specific embodiment according to present invention low tension battery under drive mode fills The flow chart of electric control method;
Fig. 5 is the block diagram of electric vehicle according to an embodiment of the invention;And
Fig. 6 is the block diagram of electric vehicle according to another embodiment of the invention.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached The embodiment that figure describes is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
The low tension battery charging controlling party of the electric vehicle proposed according to embodiments of the present invention is described with reference to the accompanying drawings Method and electric vehicle.
Fig. 1 is the flow process of the low tension battery charge control method of electric vehicle according to an embodiment of the invention Figure, wherein, electric vehicle includes high voltage power supply such as electrokinetic cell, low tension battery and power supply changeover device, and power supply changeover device divides Not being connected with high voltage power supply and low tension battery, high voltage power supply such as electrokinetic cell is for providing driving power, low pressure for car load The low-voltage electrical appliance that accumulator is electric vehicle such as cooling system, vacuum system etc. provide low-tension supply, power supply changeover device example As low pressure is such as converted to high pressure for changing supply voltage or high pressure is converted to low pressure by DC/DC transducer.
As it is shown in figure 1, the low tension battery charge control method of this electric vehicle comprises the following steps:
S1, the entire car controller of electric vehicle detects the operational mode that electric vehicle is current, and wherein, operational mode includes row Car pattern and car-parking model.Such as, entire car controller obtains the row of each sensor or assistant controller by the CAN network of car load Car status data such as key information, GES, wheel speed signal, brake signal, and then judge to work as according to driving states data Front electric vehicle is drive mode or car-parking model, and such as key starts, speed is not zero, without brake signal, wheel speed is not May determine that when zero that electric vehicle is travelling, otherwise be in dead ship condition.
S2, if electric vehicle is in car-parking model, then after high voltage power supply stops High voltage output, i.e. at car load high pressure After lower electricity, entire car controller obtains the information about power of low tension battery every Preset Time.
Usually, under car load high pressure after electricity, entire car controller also enters resting state, so in the enforcement of the present invention In example, an entire car controller can be waken up up every Preset Time, and then entire car controller obtains low pressure electric power storage by CAN The information about power in pond.
In one embodiment of the invention, electric vehicle also includes timer, if electric vehicle is in car-parking model, Then stopping after High voltage output in high voltage power supply, entire car controller sends riming instructions to timer so that timer initiation meter Time, and entire car controller entrance resting state;When the timing time of timer reaches Preset Time, entire car controller is receiving To timer wake up instruction up after be waken up, then control high voltage power supply output and obtain low tension battery information about power.
Specifically, timer includes data acquisition unit DAU (digital acquisition unit), data acquisition list Unit DAU has time clock feature and can send wake-up signal to entire car controller.
S3, when the electricity of low tension battery is less than charging lower threshold, vehicle control unit controls power supply changeover device starts So that high-tension electricity is converted to low tension, think that low tension battery charges.
Entire car controller judges whether to need to charge for low tension battery, to avoid low pressure according to the electricity of low tension battery There is electric deficiency phenomenon in accumulator, especially when vehicle is shelved for a long time, it is ensured that the normal supply of vehicle low pressure.When low tension battery When electricity is less than charging lower threshold, then explanation needs to charge for low tension battery, and otherwise low tension battery i.e. will appear from power shortage Problem, then vehicle control unit controls power supply changeover device such as DC/DC transducer starts so that high-tension electricity is converted to low tension such as 12V or 24V voltage, thinks that low tension battery charges.
Specifically, when the electricity of low tension battery is less than charging lower threshold, entire car controller can control power supply and turn Parallel operation starts so that the high-tension electricity that high voltage power supply exports is converted to low tension, thinks that low tension battery charges;Or, when low pressure stores When the electricity of battery is less than charging lower threshold, entire car controller can control power supply changeover device and start with by the height of external power supply Piezoelectricity is converted to low tension, thinks that low tension battery charges.Put it briefly, when electric vehicle is in car-parking model, if low Pressure accumulator needs charging, then vehicle control unit controls transducer starts with by the high-tension electricity of high voltage power supply or external power supply such as 380V voltage is converted to low tension such as 12V, to supply low tension battery, it is ensured that the electricity of low tension battery is sufficient to avoid out Existing electric deficiency phenomenon, affects electric vehicle and starts, shorten the low tension battery life-span.
It can be seen that the low tension battery charge control method of the electric vehicle of the embodiment of the present invention, at electric vehicle When car-parking model, after high voltage power supply stops High voltage output, entire car controller obtains low tension battery every Preset Time Information about power, and when low tension battery electricity less than charging lower threshold time, control power supply changeover device start thinks low pressure Accumulator is charged, and thereby may be ensured that electric vehicle, in the especially low tension battery electricity abundance when shelving for a long time of stopping, reduces The risk of power shortage occurs to affect normal vehicle operation, and ensure the service life of low tension battery.
Further, when the electricity of low tension battery reaches charging upper limit threshold value, vehicle control unit controls Power convert Device stops charging and control high voltage power supply stopping output for low tension battery and is in preferable shape with the electricity ensureing low tension battery State, entire car controller enters resting state.
Fig. 2 is low tension battery charging when being in car-parking model of the electric vehicle of a specific embodiment according to the present invention The flow chart controlled, as in figure 2 it is shown, the method includes:
S110, electricity under electric vehicle high pressure, entire car controller VCU transmission riming instructions to data acquisition unit DAU.
S120, data acquisition unit ADU carry out timing, and data acquisition unit ADU starts meter after receiving riming instructions Time.
S130, it is judged that whether the timing time of data acquisition unit ADU reaches Preset Time, if it is, enter step S140, otherwise returns step S120.
S140, data acquisition unit ADU wake up entire car controller VCU up, and vehicle control unit controls electric vehicle high pressure powers on.
S150, it is judged that whether the electricity of low tension battery is less than charging lower threshold, if it is, enter step S160, Otherwise return step S110.
S160, high-tension electricity or the high-tension electricity of external power supply that electrokinetic cell is exported by control DC/DC transducer are converted to Low tension is to charge to low tension battery.
S170, it is judged that whether the electricity of low tension battery reaches charging upper limit threshold value, if it is, enter step S180, Otherwise return step S160.
S180, DC/DC transducer stops charging for low tension battery, and entire car controller enters resting state, and returns step Rapid S110.
It can be seen that under car-parking model in the charging control process of low tension battery, main table quantitatively includes data acquisition The collection timing time of unit ADU, the charging lower threshold of low tension battery and the charging upper limit threshold value of low tension battery.
In a word, the low tension battery charge control method of the electric vehicle of the embodiment of the present invention, can reduce during parking outstanding It is electric vehicle power shortage risk of low tension battery when shelving for a long time, extends low tension battery service life, and low cost, Safety is high.
On the other hand, the low tension battery charge control method of the electric vehicle of the embodiment of the present invention, it is also possible to solve electricity Motor-car is energy consumption height and the problem of low tension battery power shortage when drive mode, can extend while reducing car load energy consumption The service life of low tension battery.
Fig. 3 is the flow process of the low tension battery charge control method of electric vehicle according to another embodiment of the invention Figure, as it is shown on figure 3, above-mentioned charge control method also includes:
S4, if electric vehicle is in drive mode, then entire car controller obtains the information about power of low tension battery in real time.
S5, when the electricity of low tension battery is less than charging lower threshold, vehicle control unit controls power supply changeover device starts Be converted to low tension such as 12V with high-tension electricity such as 380V high voltage power supply exported, think that low tension battery charges.In driving Time, high voltage power supply such as electrokinetic cell is in High voltage output, if the electricity of low tension battery is less than charging lower threshold, then may be used With control DC/DC transducer, the output high-tension electricity of electrokinetic cell is converted to the low tension needed for low tension battery, right to realize The charging of low tension battery, such that it is able to reduce the risk of low tension battery power shortage when driving, extends making of low tension battery Use the life-span.
Further, when the electricity of low tension battery reaches charging upper limit threshold value, vehicle control unit controls Power convert Device stops charging for low tension battery.
Fig. 4 is the low tension battery charging when drive mode of the electric vehicle of another specific embodiment according to the present invention The flow chart controlled, as shown in Figure 4, this charging control process specifically includes:
S210, electric vehicle high pressure powers on and is in drive mode, the voltage of entire car controller VCU monitoring low tension battery.
S220, it is judged that whether low tension battery voltage is less than charging lower threshold, if it is, enter step S230, no Then return step S210.
S230, the high-tension electricity that electrokinetic cell exports is converted to low tension and thinks low tension battery by control DC/DC transducer Charging.
S240, it is judged that whether the voltage of low tension battery reaches charging upper limit threshold value, if yes then enter step S250, no Then return step S230.
S250, controls DC/DC transducer and stops charging for low tension battery.
In sum, the low tension battery charge control method of the electric vehicle of the embodiment of the present invention, can reduce electronic The vehicle power shortage risk of low tension battery when car-parking model is especially when shelving for a long time and in driving, extends low pressure electric power storage In the service life in pond, method is simple, easily implements, and safety is high.
The electric vehicle that embodiment proposes according to a further aspect of the invention is described with reference to the accompanying drawings.
Fig. 5 is the block diagram of electric vehicle according to an embodiment of the invention, as it is shown in figure 5, this electric vehicle 100 wraps Include high voltage power supply 10, low tension battery 20, coulometric detector 30, power supply changeover device 40 and entire car controller 50.
Wherein, high voltage power supply 10, such as electrokinetic cell, drive power for providing for electric vehicle 100;Low tension battery 20 provide power supply for the low-voltage electrical appliance for electric vehicle 100;Coulometric detector 30 is for detecting the electricity of low tension battery 20 Amount;Power supply changeover device 40 is connected with high voltage power supply 10 and low tension battery 20 respectively;Entire car controller 50 detects electric vehicle 100 Current operational mode, wherein, operational mode includes drive mode and car-parking model, is in car-parking model at electric vehicle 100 Time and after high voltage power supply 10 stops High voltage output, entire car controller 50 every Preset Time obtain low tension battery 20 electricity Amount information, and when the electricity of low tension battery 20 is less than charging lower threshold, controls power supply changeover device 40 and start with by high pressure Electricity such as 380V is converted to low tension such as 12V, thinks that low tension battery 20 charges.
The electric vehicle 100 of the embodiment of the present invention, after being in car-parking model and high voltage power supply 10 stops High voltage output, Entire car controller 50 obtains the information about power of low tension battery 20 every Preset Time, and when the electricity of low tension battery 20 is less than During charging lower threshold, control power supply changeover device 40 startup and think that low tension battery 20 charges, thereby may be ensured that electric vehicle 100, in the especially low tension battery 20 electricity abundance when shelving for a long time of stopping, reduce and the risk of power shortage occur just to affect vehicle Often work, and ensure the service life of low tension battery 20.
As shown in Figure 6, electric vehicle 100 also includes that timer 60, entire car controller 50 are in parking at electric vehicle 100 Pattern and after high voltage power supply 10 stops High voltage output, sends riming instructions to timer 60 so that timer 60 starts meter Time, and entire car controller 50 enters resting state, and when the timing time of timer 60 reaches Preset Time, entire car controller 50 instructions that wake up up receiving timer 60, and control high voltage power supply 10 exports and obtains low tension battery 20 after being woken Information about power.
Specifically, timer 60 includes that data acquisition unit DAU, data acquisition unit DAU have time clock feature and can To send wake-up signal to entire car controller 50.
Wherein, when the electricity of low tension battery 20 is less than charging lower threshold, entire car controller 50 can control power supply Transducer 40 starts the high-tension electricity that high voltage power supply 10 exports is converted to low tension, or, entire car controller 50 controls power supply Transducer 40 starts the high-tension electricity of external power supply is converted to low tension, thinks that low tension battery 20 charges.
Further, entire car controller 50 is additionally operable to when the electricity of low tension battery 20 reaches charging upper limit threshold value, control Power supply changeover device 40 processed stops charging and control high voltage power supply 10 for low tension battery 20 and stops output, and entire car controller 50 Enter resting state.
It addition, the electric vehicle 100 of the embodiment of the present invention can also realize the charging to low tension battery 20 when driving Control, to reduce the power shortage risk of low tension battery 20.Specifically, entire car controller 50 is in driving mould at electric vehicle 100 During formula, obtain the information about power of low tension battery 20 in real time, and when the electricity of low tension battery 20 is less than charging lower threshold, Control power supply changeover device 40 to start the high-tension electricity that high voltage power supply 10 exports is converted to low tension, think that low tension battery 20 fills Electricity.When driving, high voltage power supply 10 such as electrokinetic cell is in High voltage output, if the electricity of low tension battery 20 is less than charging Lower threshold, then can control DC/DC transducer by the output of electrokinetic cell needed for high-tension electricity is converted to low tension battery 20 Low tension, to realize the charging to low tension battery 20, such that it is able to reduce the risk of low tension battery 20 power shortage when driving, Extend the service life of low tension battery 20.
Further, entire car controller 50, when the electricity of low tension battery 20 reaches charging upper limit threshold value, controls power supply Transducer 40 stops charging for low tension battery 20.
In sum, the electric vehicle 100 of the embodiment of the present invention, at car-parking model especially when shelving for a long time and be expert at The charging to low tension battery 20 can be realized during car control, reduce the power shortage risk of low tension battery 20, extend low pressure electric power storage In the service life in pond 20, low cost, safety is high.
It should be noted that in the description of this specification, any mistake described otherwise above in flow chart or at this Journey or method describe and are construed as, and represent and include that one or more is for the step realizing specific logical function or process The module of code, fragment or the part of executable instruction, and the scope of the preferred embodiment of the present invention includes other Realize, wherein can not by order that is shown or that discuss, including according to involved function by basic mode simultaneously or by Contrary order, performs function, and this should be understood by embodiments of the invention person of ordinary skill in the field.
Represent in flow charts or the logic described otherwise above at this and/or step, for example, it is possible to be considered as to use In the sequencing list of the executable instruction realizing logic function, may be embodied in any computer-readable medium, for Instruction execution system, device or equipment (system such as computer based system, including processor or other can hold from instruction Row system, device or equipment instruction fetch also perform the system instructed) use, or combine these instruction execution systems, device or set Standby and use.For the purpose of this specification, " computer-readable medium " can be any can to comprise, store, communicate, propagate or pass Defeated program is for instruction execution system, device or equipment or combines these instruction execution systems, device or equipment and the dress that uses Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following: have the electricity of one or more wiring Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read only memory (ROM), erasable read only memory (EPROM or flash memory), the fiber device edited, and portable optic disk is read-only deposits Reservoir (CDROM).It addition, computer-readable medium can even is that and can print the paper of described program thereon or other are suitable Medium, because then can carry out editing, interpreting or if desired with it such as by paper or other media are carried out optical scanning His suitable method is processed to electronically obtain described program, is then stored in computer storage.
Should be appreciated that each several part of the present invention can realize by hardware, software, firmware or combinations thereof.Above-mentioned In embodiment, the software that multiple steps or method in memory and can be performed by suitable instruction execution system with storage Or firmware realizes.Such as, if realized with hardware, with the most the same, available well known in the art under Any one or their combination in row technology realize: have the logic gates for data signal realizes logic function Discrete logic, there is the special IC of suitable combination logic gate circuit, programmable gate array (PGA), on-the-spot Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that and realize all or part of step that above-described embodiment method is carried Suddenly the program that can be by completes to instruct relevant hardware, and described program can be stored in a kind of computer-readable storage medium In matter, this program upon execution, including one or a combination set of the step of embodiment of the method.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office One or more embodiments or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel Close and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, revises, replaces and modification.

Claims (14)

1. the low tension battery charge control method of an electric vehicle, it is characterised in that described electric vehicle includes high-tension electricity Source, low tension battery and power supply changeover device, described power supply changeover device respectively with described high voltage power supply and described low tension battery phase Even, described charge control method comprises the following steps:
The entire car controller of described electric vehicle detects the operational mode that electric vehicle is current, and wherein, described operational mode includes Drive mode and car-parking model;
If described electric vehicle is in described car-parking model, then after described high voltage power supply stops High voltage output, described whole Vehicle controller obtains the information about power of described low tension battery every Preset Time;
When the electricity of described low tension battery is less than charging lower threshold, power supply changeover device described in described vehicle control unit controls Start so that high-tension electricity is converted to low tension, think that described low tension battery charges.
2. the low tension battery charge control method of electric vehicle as claimed in claim 1, it is characterised in that described electric motor car Also include timer, if described electric vehicle is in described car-parking model, then stop High voltage output in described high voltage power supply Afterwards, described entire car controller obtains the information about power of described low tension battery every Preset Time, farther includes:
If described electric vehicle is in described car-parking model, then after described high voltage power supply stops High voltage output, described whole Vehicle controller sends riming instructions to described timer so that described timer initiation timing, and described entire car controller enters and stops Dormancy state;And
When the timing time of described timer reaches described Preset Time, described entire car controller is receiving described timer Wake up instruction up after be waken up, control described high voltage power supply and export and obtain the information about power of described low tension battery.
3. the low tension battery charge control method of electric vehicle as claimed in claim 2, it is characterised in that described timer Including data acquisition unit DAU.
4. the low tension battery charge control method of electric vehicle as claimed in claim 2, it is characterised in that when described low pressure When the electricity of accumulator is less than charging lower threshold, power supply changeover device described in described vehicle control unit controls starts with by high-tension electricity Be converted to low tension, think that described low tension battery charges, farther include:
When the electricity of described low tension battery is less than described charging lower threshold, power supply described in described vehicle control unit controls turns Parallel operation starts so that the high-tension electricity that described high voltage power supply exports is converted to low tension, thinks that described low tension battery charges;Or,
When the electricity of described low tension battery is less than described charging lower threshold, power supply described in described vehicle control unit controls turns Parallel operation starts so that the high-tension electricity of external power supply is converted to low tension, thinks that described low tension battery charges.
5. the low tension battery charge control method of electric vehicle as claimed in claim 4, it is characterised in that also include:
When the electricity of described low tension battery reaches charging upper limit threshold value, power supply changeover device described in described vehicle control unit controls Stop charging and control described high voltage power supply for described low tension battery and stop output;And
Described entire car controller enters resting state.
6. the low tension battery charge control method of electric vehicle as claimed in claim 1, it is characterised in that also include:
If described electric vehicle is in described drive mode, the most described entire car controller obtains described low tension battery in real time Information about power;And
When the electricity of described low tension battery is less than described charging lower threshold, power supply described in described vehicle control unit controls turns Parallel operation starts so that the high-tension electricity that described high voltage power supply exports is converted to low tension, thinks that described low tension battery charges.
7. the low tension battery charge control method of electric vehicle as claimed in claim 6, it is characterised in that also include:
When the electricity of described low tension battery reaches charging upper limit threshold value, power supply changeover device described in described vehicle control unit controls Stop charging for described low tension battery.
8. an electric vehicle, it is characterised in that including:
High voltage power supply, drives power for providing for electric vehicle;
Low tension battery, provides power supply for the low-voltage electrical appliance for described electric vehicle;
Coulometric detector, for detecting the electricity of described low tension battery;
Power supply changeover device, described power supply changeover device is connected with described high voltage power supply and described low tension battery respectively;
Entire car controller, the operational mode that described entire car controller detection electric vehicle is current, wherein, described operational mode includes Drive mode and car-parking model, when described electric vehicle is in car-parking model and described high voltage power supply stop High voltage output it After, described entire car controller obtains the information about power of described low tension battery every Preset Time, and at described low tension battery Electricity less than charging lower threshold time, control described power supply changeover device start so that high-tension electricity is converted to low tension, think institute State low tension battery charging.
9. electric vehicle as claimed in claim 8, it is characterised in that described electric vehicle also includes:
Timer, described entire car controller is in described car-parking model at described electric vehicle and stops height in described high voltage power supply After pressure output, send riming instructions to described timer so that described timer initiation timing, and described entire car controller enters Enter resting state, and when the timing time of described timer reaches described Preset Time, described entire car controller receives described Timer wake up instruction up, and control the output of described high voltage power supply after being woken and obtain the electricity of described low tension battery Amount information.
10. electric vehicle as claimed in claim 9, it is characterised in that described timer includes data acquisition unit ADU.
11. electric vehicles as claimed in claim 9, it is characterised in that wherein, power supply described in described vehicle control unit controls turns Parallel operation starts so that the high-tension electricity that described high voltage power supply exports is converted to low tension, or, described in described vehicle control unit controls Power supply changeover device starts so that the high-tension electricity of external power supply is converted to low tension, thinks that described low tension battery charges.
12. electric vehicles as claimed in claim 11, it is characterised in that described entire car controller is additionally operable to store in described low pressure When the electricity of battery reaches charging upper limit threshold value, control described power supply changeover device and stop charging for described low tension battery and controlling Described high voltage power supply stops output, and described entire car controller enters resting state.
13. electric vehicles as claimed in claim 8, it is characterised in that described entire car controller is additionally operable in described electric motor car When being in drive mode, obtain the information about power of described low tension battery in real time, and low at the electricity of described low tension battery When described charging lower threshold, control described power supply changeover device and start so that the high-tension electricity that described high voltage power supply exports is converted to Low tension, thinks that described low tension battery charges.
14. electric vehicles as claimed in claim 13, it is characterised in that described entire car controller is additionally operable to store in described low pressure When the electricity of battery reaches charging upper limit threshold value, control described power supply changeover device and stop charging for described low tension battery.
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