CN104512266B - Power supply management method in automobile starting process, and automobile power supply system - Google Patents
Power supply management method in automobile starting process, and automobile power supply system Download PDFInfo
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- CN104512266B CN104512266B CN201310456577.9A CN201310456577A CN104512266B CN 104512266 B CN104512266 B CN 104512266B CN 201310456577 A CN201310456577 A CN 201310456577A CN 104512266 B CN104512266 B CN 104512266B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention relates to an automobile electronic technology, in particular to a power supply management method in an automobile starting process, and an automobile power supply system realizing the method. The automobile power supply system disclosed by the embodiment of the invention comprises a generator, an accumulator, a DC-DC convertor and a controller, wherein the accumulator is connected with automobile electric equipment through the DC-DC convertor; the controller controls the operation of the generator and the DC-DC convertor, wherein the controller controls the starting process of an automobile according to the following manner: adjusting the duty ratio of the DC-DC convertor so as to control the declining degree of the working voltage of the automobile electric equipment to a preset level, wherein the preset level depends on a starting current provided for an automobile starter by the accumulator, the current working current of the automobile electric equipment and the electrical charge state of the accumulator.
Description
Technical field
The present invention relates to automotive electronic technology, particularly to the power supply management method during a kind of automobile start and realization
The automobile power supply system of the method.
Background technology
Automobile power supply system is mainly by energy storage device（Such as battery or ultracapacitor）, energy conversion device（For example
Convert mechanical energy into the generator of electric energy）With controller composition.Controller is the core of whole system, and it is responsible for according to electricity consumption
The operating modes such as load, battery condition and Generator Status determine and implement suitable electric energy management strategy.Starter utilizes electric power storage
The energy in pond starts automobile engine, so that engine is operated under required working condition, will drive generating during engine operating
Machine generates electricity, and the electric equipment to automobile（Such as air conditioning for automobiles, illuminating lamp, vehicle audio, vehicle-mounted range radar and navigator
Deng）Power and/or charge to battery.
In order to improve efficiency of energy utilization, start-stop controls more and more is applied in the car.Typical at one
In start-stop control process, when brake pedal is pressed, if following condition is detected be satisfied simultaneously, close engine,
And in the released rear automatic engine of brake pedal：1）The race of engine and not putting into gear；2）Vehicle wheel rotational speed senses
Device is shown as zero；And 3）Battery sensor display battery has enough electric energy to carry out startup next time.However it is necessary that point out
It is that the frequent start-stop of automobile is likely to result in the damage of auto electric equipment, because often resulting in electric equipment in automobile start
Operating voltage drastically decline.Additionally, too low voltage drop will make electric equipment shut down or error running, this is for vehicle-mounted range finding
It is unacceptable for the key equipment of radar etc.
Content of the invention
It is an object of the present invention to provide a kind of automobile power supply system, it can effectively reduce automobile start process to vapour
The impact of car electric equipment.
The above-mentioned purpose of the present invention is realized by following technical proposal：
A kind of automobile power supply system, including：
Generator；
Battery；
DC-DC converter, described battery is connected with auto electric equipment through this DC-DC converter；
Control the controller that described generator and described DC-DC converter are run,
Wherein, described controller controls automobile start process as follows：Adjust the duty of described DC-DC converter
By the decline extent control of the operating voltage of described auto electric equipment on preset level, wherein, this preset level takes ratio
Starting current, the current working current of auto electric equipment and the described electric power storage certainly providing to automobile starter in described battery
The state-of-charge in pond.
Preferably, in above-mentioned automobile power supply system, described preset level is with the operating voltage of described auto electric equipment
Decline percentage represent, its according to following formula determine：
Here δ is the decline percentage of the operating voltage of described auto electric equipment, and SOC is the charged shape of described battery
State, ISAnd IWIt is respectively described starting current and current working current, α and β is the constant more than zero that experiment determines.
Preferably, in above-mentioned automobile power supply system, described preset level is with the operating voltage of described auto electric equipment
Decline percentage represent, its according to following manner determine：
If the state-of-charge of described battery is less than first threshold, described decline percentage is 100%；
If the state-of-charge of described battery is more than or equal to first threshold and is less than Second Threshold, described decline
Percentage δ is：
Here ISAnd IWIt is respectively described starting current and current working current,γThe constant more than zero determining for experiment；
If the state-of-charge of described battery is more than or equal to Second Threshold, described decline percentage is 0%,
Preferably, in above-mentioned automobile power supply system, described first and second threshold values are respectively 60% and 95%.
Preferably, in above-mentioned automobile power supply system, described generator, battery, DC-DC converter and controller pass through
Bus mode communicates.
The present invention's it is also an object that provide one kind to power during realizing automobile start in automobile power supply system
The method of management, effectively reduces the impact to auto electric equipment for the automobile start process.
The above-mentioned purpose of the present invention can be realized in such automobile power supply system, and this system includes generator, electric power storage
Pond, DC-DC converter and the described generator of control and the controller of described DC-DC converter operation, wherein, described battery warp
Described DC-DC converter is connected with auto electric equipment, and methods described comprises the following steps：
In response to automobile start, described controller obtain the starting current of automobile starter, auto electric equipment current
Operating current and the state-of-charge of described battery；
Described controller determines the preset level of the decline degree of the operating voltage of described auto electric equipment；
Described controller adjusts the dutycycle of DC-DC converter according to described preset level, and described car electrics are set
The decline extent control of standby operating voltage is on preset level.
Preferably, in the above-mentioned methods, described controller determines the state-of-charge of described battery as follows：
Input operating voltage, operating current and the operating temperature of described battery；
Calculate operating voltage correction value under the standard operating current of described battery for the described operating voltage；
Determine the fuzzy value of described operating voltage correction value and described operating temperature using respective membership function；
Using fuzzy inference rule, according to the fuzzy value determination of described operating voltage correction value and described operating temperature
The fuzzy value of the state-of-charge of battery；And
Using antifuzzy algorithm, the fuzzy value of the state-of-charge according to described battery calculates the charged shape of described battery
State.
Preferably, in the above-mentioned methods, calculate the standard work electricity in described battery for the described operating voltage according to the following formula
Operating voltage correction value U flowing downI,m：
UI,m=UI+(I-I0)×λ(I)
Wherein, UIFor the described operating voltage under described operating current I, UI,mFor described operating voltage UICorrection value, I is
Described operating current, I0For described standard operating current, λ（I）It is the numerical value with the change of described operating current.
Preferably, in the above-mentioned methods, described standard operating current is one of the following：
The arithmetic mean of instantaneous value of the operating current under the various working conditions of described battery；
Operating current under the various working conditions of described battery adding according to its corresponding working condition probability of occurrence
Weight average value；
Mean value within a period of time for the operating current of described battery.
Preferably, in the above-mentioned methods, described λ（I）Electric discharge by battery different operating electric current at the same temperature
Curve obtains.
From combine accompanying drawing described further below, it will make above and other objects of the present invention and advantage more complete
Clear.
Brief description
Fig. 1 is the schematic diagram of the automobile power supply system according to one embodiment of the invention.
Fig. 2 be according to the automobile start of one embodiment of the invention during power supply management method flow chart.
Fig. 3 is the schematic diagram of a physical model of battery.
Fig. 4 is the state-of-charge according to one embodiment of the invention（SOC）The flow chart of computational methods.
Fig. 5,6 and 7 are respectively the person in servitude of the battery-operated voltage correction value, operating temperature and SOC in embodiment illustrated in fig. 4
Membership fuction schematic diagram.
Specific embodiment
Specific embodiment below with reference to the Description of Drawings present invention to illustrate the present invention.It is to be understood that
It is that these specific embodiments are merely exemplary, the spirit and scope for the present invention has no restriction effect.
In this manual, " couple " word to should be understood to including transmission energy direct between two units or signal
Situation, or indirectly transmit the situation of energy or signal through one or more Unit the 3rd, and signal bag designated herein
Include but be not limited to the signal presented in electricity, light and magnetic.In addition, the term of "comprising" and " inclusion " etc represents except tool
Have and have directly and clearly beyond the unit of statement and step in the specification and in the claims, technical scheme is not yet
Exclusion has not by directly or clearly other units of statement and the situation of step.Furthermore, such as " first ", " second ", " the
Three " it is not offered as unit or numerical value and only makees in the order of the aspects such as time, space, size with the term of " the 4th " etc
Distinguish each unit or numerical value is used.
In addition, battery described here refers to by chemical energy transformationization electric energy and to produce galvanic device, its
Including but not limited to lead-acid accumulator and lithium battery etc..
Fig. 1 is the schematic diagram of the automobile power supply system according to one embodiment of the invention.Referring to Fig. 1, the vapour of the present embodiment
Car electric power system 10 includes controller 110, generator 120, battery 130, AC-DC converter 140 and DC-DC converter 150.
In FIG, heavy line represents power or energy stream, and fine line represents control signal and measurement signal stream.It is worthy of note that,
Although here controller 110 and generator 120, battery 130, AC-DC converter 140 and DC-DC converter 150 etc. all with
Bus mode communicates, but it is not intended that being necessarily limited to this mode between controller and controlled device, actually
Point-to-point communication mode can also be adopted between them.
In FIG, controller 110 is the core of whole electric power system 10, and it is responsible for according to electricity consumption situation（Such as starter
30 and the need for electricity of auto electric equipment 40）, battery condition（Here it is, for example, operating current, the work electricity of battery 130
Pressure, temperature, degree of aging and state-of-charge（SOC）One or more of）And Generator Status（Such as generator current institute energy
The operating current providing）Deng the suitable electric energy management strategy of determination.
As shown in figure 1, generator 120 is coupled with battery 130 and auto electric equipment 40 through AC-DC converter 140.Vapour
Generator 120 is driven to generate electricity during car engine 20 operating, produced alternating current is converted to conjunction through AC-DC converter 140
It is supplied to battery 130 and/or auto electric equipment 40 after the direct current of suitable voltage.Additionally, under control of the controller 110,
The direct current that battery 130 exports is implemented DC boosting conversion or DC down-converter with certain by DC-DC converter 150
Power to auto electric equipment under operating voltage.In the present embodiment, using pulse frequency modulated mode or pulse width modulation
Mode is controlling the dutycycle of DC-DC converter 150, thus obtaining required output voltage.
During automobile start, battery 130 provides high current to starter 30 at short notice, and this will lead to DC-
The voltage of DC converter 150 input side declines.For this reason, controller 110 passes through to adjust the dutycycle of DC-DC converter 150, to the greatest extent may be used
The operating voltage of auto electric equipment 40 can be made not decline or not decline too much.Introduce preset level conduct in this example
Operating voltage is controlled to decline the desired value of degree, this preset level is not changeless, it depends on this automobile start
During the starting current of automobile starter, the current working current of auto electric equipment and battery state-of-charge.
Preferably, preset level to represent, it is according to following formula with the decline percentage of the operating voltage of auto electric equipment
Determine：
Here δ is the decline percentage of the operating voltage of auto electric equipment 40, and SOC is the state-of-charge of battery 130,
ISAnd IWIt is respectively the current working current of starting current and auto electric equipment, α and β is the constant more than zero that experiment determines.
It is alternatively possible to the state-of-charge of battery is divided into several scopes, and for each scope using not
Same computational methods.One given below specific example：
If the state-of-charge of battery is less than first threshold TH1, declining percentage value is 100%；
If the state-of-charge of battery is more than or equal to first threshold TH1 and is less than Second Threshold TH2, decline hundred
Divide and than δ be：
Here ISAnd IWIt is respectively the current working current of starting current and auto electric equipment, γ is the big of experiment determination
In zero constant；
If the state-of-charge of battery is more than or equal to Second Threshold TH2, declining percentage value is 0%.
In the examples described above, the first and second threshold values can distinguish value is 60% and 95%.
Fig. 2 be according to the automobile start of one embodiment of the invention during power supply management method flow chart.For explaining
State the method for the sake of facilitating it is assumed here that realizing the present embodiment using the automobile power supply system shown in Fig. 1.However it is necessary that point out
It is that the principle of the present invention is not limited to the automobile power supply system of particular type and structure.
As shown in Fig. 2 in step S210, controller 110 determines whether automobile enters starting process.For example slotting when rotating
Corresponding trigger will be produced, therefore controller 110 takes this to judge to enter during the automobile key entering automobile ignition lock in-core
Dynamic process.And for example, for start-stop control process, the state of brake pedal can be detected and judged.If it is determined that entering
Dynamic process, then enter step S220, otherwise continues the detection trigger related to starting process.
In step S220, controller 110 obtains the state-of-charge data of battery 130.State-of-charge data can be by
Controller 110 is calculated in real time according to the state parameter of battery, or regularly updates state-of-charge data.Relevant charged shape
The computational methods of state are further described below.
Subsequently enter step S230, controller 110 is communicated with starter 30 and auto electric equipment 40 through bus to obtain
The starting current data of automobile starter and the operating current data of auto electric equipment.
Then, in step S240, controller 110 calculates preset level value as control auto electric equipment operating voltage
The desired value of decline degree.Computational methods about preset level have been described above, repeat no more here.
Subsequently enter step S250, controller 110 determines accounting for of DC-DC converter 150 according to the preset level value calculating
Empty ratio, and generate corresponding control command, and DC-DC converter 150 then adjusts dutycycle according to this control command, so that
The operating voltage obtaining auto electric equipment 130 is reduced with above-mentioned preset level value.
In the present embodiment, because the calculating of state-of-charge and dutycycle completes in controller 110, therefore storing
The processor of low performance can be adopted in battery 130 and DC-DC converter 150 even can to save processor, thus will control
Focus in controller 110.Further, the management of power use of auto electric equipment 40 also can transfer to controller 110 to execute, this
Ground equipment only processes the operation related to functions of the equipments（Such as music and navigation information process etc.）.With distributed AC servo system mould
Formula is compared, and this centerized fusion pattern has many advantages, such as simplification development process and reduction hardware cost.
Then execution step S260, controller 110 for example by judge engine 20 whether enter normal operating conditions Lai
Determine whether automobile start process terminates, if terminated, return to step S210, otherwise then return to step S220.
The computational methods of storage battery charge state are below described.
Conventional state-of-charge computational methods mainly have open circuit voltage method and Current integrating method（Also referred to as ampere-hour method）.
The basic thought of open circuit voltage method initially set up a reflection battery operated when terminal voltage, electric current and electromotive force
Relational model, then according to the voltage and current that obtains of measurement obtain corresponding electromotive force with using electromotive force and state-of-charge it
Between relation curve determine state-of-charge.The advantage of the method is simple, but due to battery exist self- recoverage effect and
" platform " phenomenon and make the state-of-charge that estimates have phase difference larger with actual value.
Battery is considered as carrying out the "black box" of energy exchange with outside by Current integrating method, by existing to the electric current passing in and out battery
The accumulative variable quantity to record battery electric quantity for the temporal integration.The method is due to need not consider inside battery structure and state
Change, therefore higher compared with the adaptability of open circuit voltage method.But weak point is state-of-charge initial value to be often difficult to determine
And passage cumulative errors will constantly increase over time, thus leading to the error calculated of SOC to become big.Additionally,
Need charge and discharge electrostrictive coefficient is had one accurately estimate when Current integrating method calculates state-of-charge, when cell operating conditions change
When larger, charge and discharge electrostrictive coefficient is difficult to accurately and timely determine, this also results in and is finally calculated the presence of state-of-charge result relatively
Big error.
The present inventor propose a kind of state-of-charge computational methods, its introduce fuzzy logic so that result of calculation more
Accurately, below it is described in detail.
For the angle of electricity, the state-of-charge SOC of battery can be defined as follows：
Wherein, Q is the current residual capacity of battery, QNRated capacity when dispatching from the factory for battery, QaHold for cell decay
Amount, ε is decay factor, is a variable less than 1, ε QNRepresent the electricity that battery reality multipotency is released.Can from above
See that SOC is variable in the range of 0-1 for the span.
Research shows, the factor of impact battery remaining power includes charge-discharge magnification（I.e. charging and discharging currents）, self discharge and
The factors such as temperature, wherein, electric current is more big, and the electricity that can release is fewer.The self discharge of battery refers to be battery in storing process
The phenomenon that middle residual capacity declines, leads to the factor of self discharge to have the dissolving of burn into active material of electrode, the disproportionation of electrode
Deng.Temperature is then because the activity of electrode material and the electromobility of electrolyte and temperature to the impact that battery remaining power produces
Closely related, generally, battery high-temperature electric discharge is significantly greater than discharge capacity during low temperature discharge.
The present inventor through further investigation after find, decay factor ε in time and/or discharge and recharge number of times and send out
Raw change will fully demonstrate out in terms of the external characteristics of battery, therefore state-of-charge can be reduced to by an electric power storage
The quantity of state that the operating voltage in pond, operating current and temperature determine.
In addition, present inventors have realized that be difficult to state-of-charge in battery and operating voltage, operating current and
Accurate Mathematical Modeling is set up, although and decay factor ε is extremely complex over time and variable quantity can between temperature
Can be larger, but this change is but the process of a large time delay.Based on above-mentioned cognition, the present inventor introduces fuzzy patrolling
Collect and to portray the relation between state-of-charge and operating voltage, operating current and temperature.
In the model based on fuzzy logic, fuzzy reasoning is set up in the knowledge base being expressed as fuzzy rule, obscures rule
Then number depending on input and the output number of physical quantity and required control accuracy.For example for conventional two inputs,
The model of one output, if each input quantity is divided into 5 grades, needs 25 rules to cover the whole circumstances.With input and
The increase of the number of output variable, inference rule will non-linearly increase, and this will expend substantial amounts of computing resource, reduce and calculate speed
Degree.The present inventor proposes by using operating current, operating voltage to be modified, by the Mathematical Modeling of state-of-charge
It is reduced to voltage and two variables of temperature, thereby reduce computational complexity.Hereinafter this is further described.
Generally, there is an average load current for Vehicular accumulator cell, it can be considered as battery
Typical operating current or the operating current of standard.The operating current of this standard can be for example：1）Under various working conditions
The arithmetic mean of instantaneous value of operating current；Or 2）Operating current according to its corresponding working condition probability of occurrence be weighted average
Value；Or 3）The mean value of the operating current in a period of time that actual measurement obtains.In one embodiment of the invention, foundation
Measure the operating current obtaining, the operating voltage that measurement is obtained is scaled the operating voltage that standard works under electricity（Below
It is referred to as the correction value of operating voltage）.
Fig. 3 is the schematic diagram of a physical model of battery.Following equations can be obtained according to Fig. 3（4）：
UI=E-I × (R+R1) （4）
Wherein, E is the electromotive force of battery, and I is the operating current that measurement obtains, UIObtain for measuring under operating current I
Operating voltage, R and R1It is respectively ohmic internal resistance when battery is discharged and polarization resistance with operating current I.
Above-mentioned operating voltage UICorrection value according to following equation（5）It is calculated：
UI,m=UI+(I-I0)×λ(I) （5）
Wherein, UIMeasure the operating voltage obtaining, U under operating current II,mFor operating voltage UICorrection value, I be measurement
The operating current obtaining, I0For standard operating current, λ（I）It is the numerical value with operating current change, it can by experiment really
Fixed.
For example can be bent by the electric discharge of the constant-current discharge battery that record of experiment different operating electric current at the same temperature
Line（Namely the change curve of battery-operated voltage and state-of-charge or constant-current discharge curve）, by following equation（6）Obtain each
Plant corresponding λ under operating current（I）：
Wherein, I0For standard operating current, I is the operating current taking other values, USOC ITake during a certain value for state-of-charge
Operating voltage under operating current I, USOC I0Take standard operating current I during same value for state-of-charge0Under operating voltage.
It is worthy of note that, inventor finds, for any two curves in constant-current discharge curve, in the lotus of 0-100%
In the range of electricity condition, their vertical range（Namely the difference of operating voltage during same state-of-charge under different operating electric current）
It is held essentially constant it is believed that λ（I）Uncorrelated to state-of-charge, therefore in above formula（6）In, any one can be selected charged
U under stateSOC IAnd USOC I0To calculate λ（I）.Further, since λ（I）Change for temperature is insensitive, therefore calculated above
Temperature factor is not considered during the correction value of operating voltage.
λ under various operating currents（I）Can be stored in the way of form in memory, with evaluation work voltage
Called during correction value.On the other hand it is also possible to utilize fitting algorithm, obtain λ from a plurality of constant-current discharge curve（I）With work electricity
Empirical equation between stream, so, can obtain λ using empirical equation when calculating correction value（I）.
Fig. 4 is the flow chart of the state-of-charge computational methods according to one embodiment of the invention.
Referring to Fig. 4, in step 411, input the operating current I of battery and operating voltage U under this operating currentI
And work temperature.Operating current I and operating voltage UICan be obtained by measuring circuit, work temperature can be by being arranged on storage
Battery temperature sensor near or above obtains.Measuring circuit and sensor can connect into CAN, be so used for calculating
The device of state-of-charge can obtain the measured value of above-mentioned working condition through bus.
Subsequently enter step 412, judge whether operating current is equal to the operating current of standard, or judge the work with standard
Whether the difference making electric current, in a default scope, if it is judged that being true, then entering step 413, otherwise, entering step
Rapid 414.
In step 414, by way of tabling look-up, for example obtain the λ under work at present circuit I（I）.
Subsequently enter in step 415, for example, utilize above formula（6）Evaluation work voltage UIWork under standard operating current
Voltage correction value UI,m.Step 413 is entered after completing step 415.
In step 413, judge operating voltage correction value UI,mWith work temperature whether beyond respective predetermined
Span, if they are all located in respective predetermined span, enter step 417, otherwise, then shows have
Abnormal conditions occur, and hence into step 416.
In step 416, alert message will be generated, and prompt the user with battery and be likely to occur abnormal working condition or survey
Amount circuit and sensor are likely to occur fault.
In step 417, using operating voltage correction value UI,mRespective membership function determines theirs with work temperature
Fuzzy value.
Fig. 5,6 and 7 are respectively operating voltage correction value U in the present embodimentI,m, work temperature and storage battery charge state
Membership function schematic diagram.As illustrated in figs. 5-7, operating voltage correction value, operating temperature and state-of-charge are divided into 3 respectively
Individual, 3 and 3 fuzzy subsets, and membership function is all in the form of triangular membership.But it should be understood that
Shown situation is only illustrative nature, actually can also adopt greater or lesser number of fuzzy subset, and be subordinate to
Function can also adopt other forms, for example including but not limited to trapezoidal membership function and Gauss π membership function.
Subsequently enter in step 418, using fuzzy inference rule, the operating voltage according to obtaining in previous step 417 is repaiied
On the occasion of UI,mDetermine the fuzzy value of state-of-charge with the fuzzy value of work temperature.
The rule of fuzzy reasoning can be according to the relation of state-of-charge under different operating electric current and voltage and temperature to putting
The impact of electric curve is formulated, and modification can be repeated by emulation experiment.Following inference rule for example can be adopted：
（1）If the fuzzy value of the correction value of operating voltage is L, the fuzzy value of state-of-charge is L；
（2）If the fuzzy value of the correction value of operating voltage is M and the fuzzy value of operating temperature is Cold, charged shape
The fuzzy value of state is L；
（3）If the fuzzy value of the correction value of operating voltage is M and the fuzzy value of operating temperature is Warm, charged shape
The fuzzy value of state is M；
（4）If the fuzzy value of the correction value of operating voltage is M and the fuzzy value of operating temperature is Hot, charged shape
The fuzzy value of state is M；
（5）If the fuzzy value of the correction value of operating voltage is H and the fuzzy value of operating temperature is Cold, charged shape
The fuzzy value of state is M；
（6）If the fuzzy value of the correction value of operating voltage is H and the fuzzy value of operating temperature is Warm, charged shape
The fuzzy value of state is H；
（7）If the fuzzy value of the correction value of operating voltage is H and the fuzzy value of operating temperature is Hot, charged shape
The fuzzy value of state is H.
It is worthy of note that, above-mentioned inference rule is only illustrative nature, in order to obtain preferable state-of-charge estimation
As a result, it is desirable to be optimized according to emulation experiment or actual experiment.
Subsequently enter step 419, using antifuzzy algorithm, fuzzy according to the state-of-charge obtaining in above-mentioned steps 418
The exact numerical of the state-of-charge of value calculating accumulator.
Subsequently enter step 420, output utilizes the calculated SOC of anti fuzzy method algorithm.
Anti fuzzy method algorithm has multiple, including but not limited to minimum maximum basis, maximum method, gravity model appoach, halving method
With intermediate maximum method etc..Suitable Anti-fuzzy can be selected according to the computational accuracy of the available degree of computing resource and requirement
Algorithm.
Due to the present invention, therefore this reality can be implemented in a variety of manners under the spirit without departing substantially from essential characteristic of the present invention
The mode of applying is illustrative and not restrictive, because the scope of the present invention is defined by the independent claims, rather than by saying
The definition of bright book, therefore falls into all changes in the border and boundary of claim, or this claim border and boundary
Equivalent thus forgiven by claim.
Claims (13)
1. a kind of automobile power supply system, including：
Generator；
Battery；
DC-DC converter, described battery is connected with auto electric equipment through this DC-DC converter；
Control the controller that described generator and described DC-DC converter are run,
It is characterized in that, described controller controls automobile start process as follows：Adjust accounting for of described DC-DC converter
Empty ratio, by the decline extent control of the operating voltage of described auto electric equipment on preset level,
Wherein, described preset level provides to automobile starter depending on described battery starting current, auto electric equipment
Current working current and described battery state-of-charge.
2. automobile power supply system as claimed in claim 1, wherein, described preset level is with the work of described auto electric equipment
The decline percentage of voltage represents, it determines according to following formula：
Here δ is the decline percentage of the operating voltage of described auto electric equipment, and SOC is the state-of-charge of described battery, IS
And IWIt is respectively described starting current and current working current, α and β is the constant more than zero that experiment determines.
3. automobile power supply system as claimed in claim 1, wherein, described preset level is with the work of described auto electric equipment
The decline percentage of voltage represents, it determines according to following manner：
If the state-of-charge of described battery is less than first threshold, described decline percentage is 100%；
If the state-of-charge of described battery is more than or equal to first threshold and is less than Second Threshold, described decline percentage
Than δ it is：
Here ISAnd IWIt is respectively described starting current and current working current, γ is the constant more than zero that experiment determines；
If the state-of-charge of described battery is more than or equal to Second Threshold, described decline percentage is 0%.
4. automobile power supply system as claimed in claim 3, wherein, described first and second threshold values are respectively 60% He
95%.
5. automobile power supply system as claimed in claim 1, wherein, described generator, battery, DC-DC converter and control
Device is communicated by bus mode.
6. a kind of method realizing power supply management during automobile start in automobile power supply system, described automobile power supply system bag
Include generator, battery, DC-DC converter and control the controller that described generator and described DC-DC converter are run, it is special
Levy and be, described battery is connected with auto electric equipment through described DC-DC converter, and methods described comprises the following steps：
In response to automobile start, described controller determines the default water of the decline degree of the operating voltage of described auto electric equipment
Flat；
Described controller adjusts the dutycycle of DC-DC converter according to described preset level, by described auto electric equipment
The decline extent control of operating voltage on preset level,
Wherein, described preset level depend on the starting current of automobile starter, the current working current of auto electric equipment and
The state-of-charge of described battery.
7. method as claimed in claim 6, wherein, described preset level is with the operating voltage of described auto electric equipment
Fall percentage represents, it determines according to following formula：
Here δ is the decline percentage of the operating voltage of described auto electric equipment, and SOC is the state-of-charge of described battery, IS
And IWIt is respectively described starting current and current working current, α and β is the constant more than zero that experiment determines.
8. method as claimed in claim 6, wherein, described preset level is with the operating voltage of described auto electric equipment
Fall percentage represents, it determines according to following manner：
If the state-of-charge of described battery is less than first threshold, described decline percentage is 100%；
If the state-of-charge of described battery is more than or equal to first threshold and is less than Second Threshold, described decline percentage
Than δ it is：
Here ISAnd IWIt is respectively described starting current and current working current, γ is the constant more than zero that experiment determines；
If the state-of-charge of described battery is more than or equal to Second Threshold, described decline percentage is 0%.
9. method as claimed in claim 8, wherein, described first and second threshold values are respectively 60% and 95%.
10. method as claimed in claim 6, wherein, described controller determines the charged of described battery as follows
State：
Input operating voltage, operating current and the operating temperature of described battery；
Calculate operating voltage correction value under the standard operating current of described battery for the described operating voltage；
Determine the fuzzy value of described operating voltage correction value and described operating temperature using respective membership function；
Using fuzzy inference rule, described electric power storage is determined according to the fuzzy value of described operating voltage correction value and described operating temperature
The fuzzy value of the state-of-charge in pond；And
Using antifuzzy algorithm, the fuzzy value of the state-of-charge according to described battery calculates the state-of-charge of described battery.
11. methods as claimed in claim 10, wherein, calculate the standard in described battery for the described operating voltage according to the following formula
Operating voltage correction value U under operating currentI,m：
UI,m=UI+(I-I0)×λ(I)
Wherein, UIFor the described operating voltage under described operating current I, UI,mFor described operating voltage UICorrection value, I be described
Operating current, I0For described standard operating current, λ (I) is the numerical value with the change of described operating current.
12. methods as claimed in claim 11, wherein, described standard operating current is one of the following：
The arithmetic mean of instantaneous value of the operating current under the various working conditions of described battery；
Operating current under the various working conditions of described battery is put down according to the weighting of its corresponding working condition probability of occurrence
Average；
Mean value within a period of time for the operating current of described battery.
13. methods as claimed in claim 11, wherein, described λ (I) passes through battery different operating electric current at the same temperature
Discharge curve obtain.
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| CN104936097A (en) * | 2015-06-03 | 2015-09-23 | 上海徽俊电子技术有限公司 | Control system of vehicle-mounted sound device |
| CN107284380B (en) * | 2017-05-26 | 2023-03-28 | 中国第一汽车股份有限公司 | Super capacitor system for recovering vehicle braking energy |
| US10145881B1 (en) * | 2017-10-03 | 2018-12-04 | Ford Global Technologies, Llc | Autonomous vehicle maintenance self-charge |
| CN107757420B (en) * | 2017-10-20 | 2019-10-25 | 台州赛盈电机科技有限公司 | A kind of control method of the soft or hard starting adjustment of drive system of electric motor vehicle |
| US11338811B2 (en) * | 2019-09-05 | 2022-05-24 | Aptiv Technologies Limited | Mode selector module for a vehicle component |
| CN112583068B (en) * | 2020-11-04 | 2023-09-22 | 长城汽车股份有限公司 | Control method and system of direct current/direct current (DC/DC) converter |
| CN114035064B (en) * | 2021-12-20 | 2024-06-18 | 武汉蔚能电池资产有限公司 | Battery charge state correction method, device, vehicle and storage medium |
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