CN104512266A - 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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- CN104512266A CN104512266A CN201310456577.9A CN201310456577A CN104512266A CN 104512266 A CN104512266 A CN 104512266A CN 201310456577 A CN201310456577 A CN 201310456577A CN 104512266 A CN104512266 A CN 104512266A
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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
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, the power supply management method particularly in a kind of automobile start process and the automobile power supply system realizing the method.
Background technology
Automobile power supply system forms primarily of closed-center system (such as storage battery or ultracapacitor), energy conversion device (such as mechanical energy being converted to the electrical generator of electric energy) and controller.Controller is the core of whole system, and it is responsible for determining according to operating modes such as power load, battery condition and Generator Status and implementing suitable electric energy management strategy.Starter utilizes the energy of storage battery to start automotive engine, driving engine is operated under required mode of operation, during engine running, drive electrical generators is generated electricity, and to electric equipment (such as air conditioning for automobiles, illuminating lamp, vehicle audio, vehicle-mounted range only radar and the navigating instrument etc.) power supply of automobile and/or to battery charge.
In order to improve efficiency of energy utilization, start-stop controls more and more to be applied in the car.In a typical start-stop control process, when brake pedal is pressed, if detect that following condition is satisfied simultaneously, then to kill engine, and at the released rear automatic actuation engine of brake pedal: 1) racing of the engine and not putting into gear; 2) wheel speed sensor is shown as zero; And 3) battery sensor display storage battery have enough electric energy carry out next time startup.But it is pointed out that the frequent start-stop of automobile likely causes the damage of auto electric equipment, because often cause the operating voltage of electric equipment sharply to decline at automobile start.In addition, too low loss in voltage will make electric equipment shut down or error running, this for vehicle-mounted range only radar and so on key equipment be unacceptable.
Summary of the invention
An object of the present invention is to provide a kind of automobile power supply system, it effectively can reduce the impact of automobile start process to auto electric equipment.
Above-mentioned purpose of the present invention is realized by following technical proposal:
A kind of automobile power supply system, comprising:
Electrical generator;
Storage battery;
DC-DC converter, described storage battery is connected with auto electric equipment through this DC-DC converter;
Control the controller of described electrical generator and the operation of described DC-DC converter,
Wherein, described controller controls automobile start process according to following manner: the dutycycle adjusting described DC-DC converter, with the decline extent control of the operating voltage by described auto electric equipment on preset level, wherein, this preset level depends on starting current, the current working current of auto electric equipment and the state-of-charge of described storage battery that described storage battery provides to automobile starter.
Preferably, in above-mentioned automobile power supply system, described preset level represents with the decline percentum of the operating voltage of described auto electric equipment, and it is determined according to following formula:
Here δ is the decline percentum of the operating voltage of described auto electric equipment, and SOC is the state-of-charge of described storage battery, I
sand I
wbe respectively described starting current and current working current, α and β be experiment determine be greater than zero constant.
Preferably, in above-mentioned automobile power supply system, described preset level represents with the decline percentum of the operating voltage of described auto electric equipment, and it is determined according to following manner:
If the state-of-charge of described storage battery is less than first threshold, then described decline percentum is 100%;
If the state-of-charge of described storage battery is more than or equal to first threshold and is less than Second Threshold, then described decline percentum δ is:
Here I
sand I
wbe respectively described starting current and current working current,
γfor experiment determine be greater than zero constant;
If the state-of-charge of described storage battery is more than or equal to Second Threshold, then described decline percentum 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 electrical generator, storage battery, DC-DC converter are communicated by bus mode with controller.
Of the present invention also have an object to be to provide a kind of method realizing power supply management in automobile start process in automobile power supply system, effectively reduces automobile start process to the impact of auto electric equipment.
Above-mentioned purpose of the present invention can realize in such automobile power supply system, this system comprises the controller of the described electrical generator of electrical generator, storage battery, DC-DC converter and control and the operation of described DC-DC converter, wherein, described storage battery is connected with auto electric equipment through described DC-DC converter, and described method comprises the following steps:
In response to automobile start, described controller obtains the state-of-charge of the starting current of automobile starter, the current working current of auto electric equipment and described storage battery;
The preset level of the decline degree of the operating voltage of described auto electric equipment determined by described controller;
Described controller adjusts the dutycycle of DC-DC converter, with the decline extent control of the operating voltage by described auto electric equipment on preset level according to described preset level.
Preferably, in the above-mentioned methods, the state-of-charge of described storage battery determined by described controller according to following manner:
Input the operating voltage of described storage battery, working current and operating temperature;
Calculate the operating voltage correction of described operating voltage under the standard operation electric current of described storage battery;
Respective subordinate function is utilized to determine the fuzzy value of described operating voltage correction and described operating temperature;
Utilize fuzzy inference rule, determine the fuzzy value of the state-of-charge of described storage battery according to the fuzzy value of described operating voltage correction and described operating temperature; And
Utilize antifuzzy algorithm, calculate the state-of-charge of described storage battery according to the fuzzy value of the state-of-charge of described storage battery.
Preferably, in the above-mentioned methods, the operating voltage correction U of described operating voltage under the standard operation electric current of described storage battery is calculated according to the following formula
i,m:
U
I,m＝U
I+(I-I
0)×λ(I)
Wherein, U
ifor the described operating voltage under described working current I, U
i,mfor described operating voltage U
icorrection, I is described working current, I
0for described standard operation electric current, λ (I) is the numerical value changed with described working current.
Preferably, in the above-mentioned methods, described standard operation electric current be following in one:
The center line average values of the working current under the various working conditions of described storage battery;
Working current under the various mode of operations of described storage battery is according to the weighted average of the mode of operation probability of occurrence of its correspondence;
The aviation value of working current within a period of time of described storage battery.
Preferably, in the above-mentioned methods, described λ (I) by storage battery at the same temperature different operating electric current discharge curve obtain.
From following detailed description by reference to the accompanying drawings, above and other objects of the present invention and advantage will be made more completely clear.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the automobile power supply system according to one embodiment of the invention.
Fig. 2 is the diagram of circuit according to the power supply management method in the automobile start process of one embodiment of the invention.
Fig. 3 is the schematic diagram of a physical model of storage battery.
Fig. 4 is the diagram of circuit of state-of-charge (SOC) method of calculating according to one embodiment of the invention.
Fig. 5,6 and 7 be respectively embodiment illustrated in fig. 4 in the subordinate function schematic diagram of battery-operated voltage correction, operating temperature and SOC.
Detailed description of the invention
Below by the specific embodiment of the present invention being described with reference to the drawings to set forth the present invention.But it is to be appreciated that these detailed description of the invention are only exemplary, restriction be there is no for spirit of the present invention and protection domain.
In this manual, " coupling " one word to should be understood to be included between two unit the situation directly transmitting energy or signal, or indirectly transmit the situation of energy or signal through one or more Unit the 3rd, and alleged signal includes but not limited to the signal of the form of electricity, light and magnetic existence here.In addition, " comprise " and the term of " comprising " and so on represents except having the unit and step that have in the specification and in the claims directly and clearly state, technical scheme of the present invention does not get rid of the situation had not by other unit of directly or clearly stating and step yet.Moreover the term of such as " first ", " second ", " the 3rd " and " the 4th " and so on does not represent order in time, space, size etc. of unit or numerical value and is only be used as to distinguish each unit or numerical value.
In addition, storage battery described here refers to and converts chemical energy electric energy can be produced galvanic device, and it includes but not limited to lead-acid storage battery and lithium cell etc.
Fig. 1 is the schematic diagram of the automobile power supply system according to one embodiment of the invention.See Fig. 1, the automobile power supply system 10 of the present embodiment comprises controller 110, electrical generator 120, storage battery 130, AC-DC converter 140 and DC-DC converter 150.In FIG, heavy line represents power or energy flow, and fine line represents control signal and measurement signal stream.It is worthy of note, although here controller 110 all communicates with bus mode with DC-DC converter 150 etc. with electrical generator 120, storage battery 130, AC-DC converter 140, but this does not also mean that and must be defined in this mode between controller and controlled device, in fact can adopt point-to-point signalling methods between them yet.
In FIG, controller 110 is cores of whole electric power system 10, and it is responsible for determining suitable electric energy management strategy according to electricity consumption situation (such as the need for electricity of starter 30 and auto electric equipment 40), battery condition (be such as the working current of storage battery 130, in operating voltage, temperature, degree of aging and state-of-charge (SOC) one or more) and Generator Status (the current working current that can provide of such as electrical generator) etc. here.
As shown in Figure 1, electrical generator 120 is coupled with storage battery 130 and auto electric equipment 40 through AC-DC converter 140.When automotive engine 20 operates, drive electrical generators 120 generates electricity, and the alternating current produced is converted to after the direct current (DC) with suitable voltage through AC-DC converter 140 and is supplied to storage battery 130 and/or auto electric equipment 40.In addition, under control of the controller 110, the direct current (DC) that exported by storage battery 130 of DC-DC converter 150 implements DC boosting conversion or DC down-converter to power to auto electric equipment under certain operating voltage.In the present embodiment, adopt pulse frequency modulation mode or pulse width modulation to control the dutycycle of DC-DC converter 150, thus obtain required output voltage.
In automobile start process, storage battery 130 provides big current to starter 30 at short notice, and this will cause the voltage drop of DC-DC converter 150 input side.For this reason, controller 110, by the dutycycle of adjustment DC-DC converter 150, makes the operating voltage of auto electric equipment 40 not decline as far as possible or does not decline too much.Introduce preset level in this example as the expected value controlling operating voltage decline degree, this preset level is not changeless, and it depends on the state-of-charge of the starting current of automobile starter, the current working current of auto electric equipment and storage battery in this automobile start process.
Preferably, preset level represents with the decline percentum of the operating voltage of auto electric equipment, and it is determined according to following formula:
Here δ is the decline percentum of the operating voltage of auto electric equipment 40, and SOC is the state-of-charge of storage battery 130, I
sand I
wbe respectively the current working current of starting current and auto electric equipment, α and β be experiment determine be greater than zero constant.
Alternatively, the state-of-charge of storage battery can be divided into several scopes, and different methods of calculating is adopted for each scope.Below provide a concrete example:
If the state-of-charge of storage battery is less than first threshold TH1, then decline percentum value is 100%;
If the state-of-charge of storage battery is more than or equal to first threshold TH1 and be less than Second Threshold TH2, then decline percentum δ is:
Here I
sand I
wbe respectively the current working current of starting current and auto electric equipment, γ be experiment determine be greater than zero constant;
If the state-of-charge of storage battery is more than or equal to Second Threshold TH2, then decline percentum value is 0%.
In the examples described above, the first and second threshold values can value be 60% and 95% respectively.
Fig. 2 is the diagram of circuit according to the power supply management method in the automobile start process of one embodiment of the invention.For setting forth conveniently, hypothesis utilizes the automobile power supply system shown in Fig. 1 to realize the method for the present embodiment here.But it is pointed out that principle of the present invention is not limited to the automobile power supply system of particular type and structure.
As shown in Figure 2, in step S210, controller 110 determines whether automobile enters starting process.Such as will produce corresponding energizing signal when rotating the automobile key inserting automobile ignition lock in-core, therefore controller 110 takes this judgement and enters starting process.And for example, for start-stop control process, the state that can detect brake pedal judges.If determine to enter starting process, then enter step S220, otherwise continue to detect the energizing signal relevant to starting process.
In step S220, controller 110 obtains the state-of-charge data of storage battery 130.State-of-charge data can be calculated in real time by the state parameter of controller 110 according to storage battery, or regular update state-of-charge data.About the method for calculating of state-of-charge will be further described below.
Enter step S230 subsequently, controller 110 communicates to obtain the starting current data of automobile starter and the working current data of auto electric equipment with auto electric equipment 40 with starter 30 through bus.
Then, in step S240, controller 110 calculates preset level value as the expected value controlling auto electric equipment operating voltage decline degree.About the method for calculating of preset level describes existing above, repeat no more here.
Enter step S250 subsequently, controller 110 is according to the dutycycle of the preset level value determination DC-DC converter 150 calculated, and generate corresponding control command, DC-DC converter 150 then according to this control command adjustment dutycycle, thus makes the operating voltage of auto electric equipment 130 reduce with above-mentioned preset level value.
In the present embodiment, because the calculating of state-of-charge and dutycycle completes in controller 110, therefore the treater of low performance can be adopted even can to save treater in storage battery 130 and DC-DC converter 150, thus control is focused in controller 110.Further, the management of power use of auto electric equipment 40 also can transfer to controller 110 to perform, and local device only processes the operation (such as music and navigation information process etc.) relevant to functions of the equipments.Compared with distributed AC servo system pattern, this centerized fusion pattern has simplification development process and reduces the plurality of advantages such as hardware cost.
Then perform step S260, controller 110, such as by judging whether driving engine 20 enters normal working and determine whether automobile start process terminates, if terminated, then returning step S210, otherwise then returning step S220.
The method of calculating of storage battery charge state is below described.
Conventional state-of-charge method of calculating mainly contains open circuit voltage method and Current integrating method (also referred to as ampere-hour method).
The basic thought of open circuit voltage method be first set up a reflection battery operated time terminal voltage, electric current and electro-motive force relational model, then obtain corresponding electro-motive force in order to the relation curve determination state-of-charge between electro-motive force and state-of-charge according to measuring the voltage and current that obtains.The advantage of the method is simple, but makes the state-of-charge that estimates and actual value have phase difference larger because battery exists self-recoverage effect and " platform " phenomenon.
Battery is considered as the "black box" carrying out energy exchange with outside by Current integrating method, by recording the accumulative variable quantity of battery electric quantity to the electric current integration in time of turnover battery.The method is owing to need not consider the change of inside battery structure and state, therefore stronger compared with the comformability of open circuit voltage method.But weak point is state-of-charge initial value to be usually difficult to determine and will constantly to increase along with time lapse cumulative errors, thus the error calculated of SOC is caused to become large.In addition, need have one to estimate accurately to discharge and recharge coefficient when Current integrating method calculates state-of-charge, when cell operating conditions changes greatly, discharge and recharge coefficient is difficult to determine accurately and timely, and this also can cause finally calculating state-of-charge result and there is larger error.
The present inventor proposes a kind of state-of-charge method of calculating, and it introduces fuzzy logic to make result of calculation more accurate, is below described in detail.
With regard to the angle of electricity, the state-of-charge SOC of storage battery can be defined as follows:
Wherein, Q is the current residual capacity of battery, Q
nfor rated capacity when storage battery dispatches from the factory, Q
afor cell decay capacity, ε is decay factor, is a variable being less than 1, ε Q
nrepresent the electricity that the actual most multipotency of storage battery is released.Therefore SOC is the variable of a span within the scope of 0-1.
Research shows, the factor affecting battery remaining power comprises the factors such as charge-discharge magnification (i.e. charging and discharging currents), self-discharge and temperature, and wherein, electric current is larger, and the electricity that can release is fewer.It is the battery phenomenon that residual capacity declines in storing process that the self-discharge of battery refers to, and causes the dissolving of burn into active substance, the disproportionation etc. of electrode because have electrode of self-discharge.Temperature on the impact that battery remaining power produces be then because the activity of electrode material and the electromobility of battery acid and temperature closely related, generally, battery high-temperature electric discharge is obviously greater than loading capacity during low temperature discharge.
The present inventor finds after in-depth study, state-of-charge in time and/or discharge and recharge number of times and the change that occurs will fully demonstrate out in the total external characteristics of storage battery, therefore can be reduced to the quantity of state determined by the operating voltage of a storage battery, working current and temperature by decay factor ε.
In addition, the present inventor recognize be difficult to storage battery state-of-charge and operating voltage, set up accurate math modeling between working current and temperature, although decay factor ε is very complicated over time and variable quantity may be comparatively large, this change is but the process of a large time delay.Based on above-mentioned cognition, the present inventor introduces fuzzy logic to portray state-of-charge and operating voltage, relation between working current and temperature.
Based in the model of fuzzy logic, fuzzy reasoning is based upon and is expressed as in the knowledge base of fuzzy rule, and the number of fuzzy rule depends on the number of input and output physical quantity and required control accuracy.Such as conventional two inputs, a model exported, if each input is divided into 5 grades, then 25 rules are needed to cover the whole circumstances.Along with the increase of the number of input and output variable, inference rule will non-linearly increase, and this is by the computational resource of at substantial, reduce computation speed.The present inventor proposes by utilizing working current to revise operating voltage, the math modeling of state-of-charge is reduced to voltage and temperature Two Variables, thereby reduces computational complexity.Below this is further described.
Generally, for Vehicular accumulator cell, there is an average load current, it can be considered as the typical working current of storage battery or the working current of standard.The working current of this standard can be such as: the center line average values of the working current 1) under various working condition; Or 2) aviation value that is weighted according to the mode of operation probability of occurrence of its correspondence of working current; Or 3) aviation value of working current in a period of time of obtaining of actual measurement.In one embodiment of the invention, according to measuring the working current obtained, the operating voltage that measurement obtains is scaled the operating voltage (correction hereinafter also referred to operating voltage) under standard operation electricity.
Fig. 3 is the schematic diagram of a physical model of storage battery.Following equations (4) can be obtained according to Fig. 3:
U
I＝E-I×(R+R
1) （4）
Wherein, E is the electro-motive force of storage battery, and I measures the working current obtained, U
ifor measuring the operating voltage obtained under working current I, R and R
1be respectively ohmic internal resistance when storage battery discharges with working current I and polarization resistance.
Above-mentioned operating voltage U
icorrection calculate according to following formula (5):
U
I,m＝U
I+(I-I
0)×λ(I) （5）
Wherein, U
ifor measuring the operating voltage obtained under working current I, U
i,mfor operating voltage U
icorrection, I measures the working current that obtains, I
0for standard operation electric current, λ (I) is the numerical value with working current change, and it can be determined by experiment.
Such as can be tested the discharge curve (also i.e. the change curve of battery-operated voltage and state-of-charge or constant-current discharge curve) of the storage battery that records different operating electric current at the same temperature by constant-current discharge, obtain under various working current λ (I) accordingly by following formula (6):
Wherein, I
0for standard operation electric current, I is the working current getting other value, U
sOC ifor the operating voltage under working current I when state-of-charge gets a certain value, U
sOC i0for standard operation electric current I when state-of-charge gets same value
0under operating voltage.
It is worthy of note, contriver finds, for any two curves in constant-current discharge curve, within the scope of the state-of-charge of 0-100%, their vertical distance (difference of operating voltage when being also the same state-of-charge under different operating electric current) remains unchanged substantially, can think that λ (I) is uncorrelated with state-of-charge, therefore in above formula (6), the U under any one state-of-charge can be selected
sOC iand U
sOC i0calculate λ (I).In addition, because λ (I) is insensitive for the change of temperature, therefore temperature factor is not considered above during the correction of evaluation work voltage.
λ (I) under various working current can be stored in memory device in the mode of form, with called when the correction of evaluation work voltage.On the other hand, also can utilizing fitting algorithm, obtain the empirical equation between λ (I) and working current from many constant-current discharge curves, like this, empirical equation can be utilized to obtain λ (I) when calculating correction.
Fig. 4 is the diagram of circuit of the state-of-charge method of calculating according to one embodiment of the invention.
See Fig. 4, in step 411, the input working current I of storage battery and the operating voltage U under this working current
iand work temperature.Working current I and operating voltage U
ican be obtained by metering circuit, work temperature can by be arranged near storage battery or on temperature sensor obtain.Metering circuit and sensor can connect into CAN, and the device like this for calculating state-of-charge can obtain the observed reading of above-mentioned mode of operation through bus.
Then enter step 412, judge whether working current equals the working current of standard, or judge and the difference of working current of standard whether in a default scope, if judged result is true, then enter step 413, otherwise, enter step 414.
In step 414, the mode such as, by tabling look-up obtains the λ (I) under work at present circuit I.
Then enter in step 415, such as, utilize above formula (6) evaluation work voltage U
ioperating voltage correction U under standard operation electric current
i,m.Step 413 is entered after completing steps 415.
In step 413, operating voltage correction U is judged
i,mwhether exceed respective predetermined span with work temperature, if they are all positioned at respective predetermined span, then enter step 417, otherwise, then show have abnormal condition to occur, and therefore enter step 416.
In step 416, will generate alert message, abnormal working condition or metering circuit and sensor may break down to point out storage battery to occur to user.
In step 417, operating voltage correction U is utilized
i,mtheir fuzzy value is determined with work temperature subordinate function separately.
Fig. 5,6 and 7 is respectively the operating voltage correction U in the present embodiment
i,m, work temperature and storage battery charge state subordinate function schematic diagram.As illustrated in figs. 5-7, operating voltage correction, operating temperature and state-of-charge are divided into 3,3 and 3 fuzzy subsets respectively, and subordinate function all adopts the form of triangular membership.But it should be understood that, shown situation is only illustrative nature, in fact can also adopt the fuzzy subset of more or less quantity, and subordinate function also can adopt other form, such as, include but not limited to trapezoidal membership function and Gaussian subordinate function.
Then enter in step 418, utilize fuzzy inference rule, according to the operating voltage correction U obtained in previous step 417
i,mwith the fuzzy value of the fuzzy value determination state-of-charge of work temperature.
The rule of fuzzy reasoning can be formulated the impact of discharge curve according to the relation of state-of-charge and voltage under different operating electric current and temperature, and repeatedly can be modified by emulation experiment.Such as can adopt following inference rule:
(1) if the fuzzy value of the correction of operating voltage is L, then the fuzzy value of state-of-charge is L;
(2) if the fuzzy value of the correction of operating voltage is M and the fuzzy value of operating temperature is Cold, then the fuzzy value of state-of-charge is L;
(3) if the fuzzy value of the correction of operating voltage is M and the fuzzy value of operating temperature is Warm, then the fuzzy value of state-of-charge is M;
(4) if the fuzzy value of the correction of operating voltage is M and the fuzzy value of operating temperature is Hot, then the fuzzy value of state-of-charge is M;
(5) if the fuzzy value of the correction of operating voltage is H and the fuzzy value of operating temperature is Cold, then the fuzzy value of state-of-charge is M;
(6) if the fuzzy value of the correction of operating voltage is H and the fuzzy value of operating temperature is Warm, then the fuzzy value of state-of-charge is H;
(7) if the fuzzy value of the correction of operating voltage is H and the fuzzy value of operating temperature is Hot, then the fuzzy value of state-of-charge is H.
It is worthy of note, above-mentioned inference rule is only illustrative nature, in order to obtain good state-of-charge estimation result, needs to be optimized according to emulation experiment or actual experiment.
Enter step 419 subsequently, utilize antifuzzy algorithm, according to the exact numerical of the state-of-charge of the fuzzy value calculating accumulator of the state-of-charge obtained in above-mentioned steps 418.
Then enter step 420, export the SOC utilizing anti fuzzy method algorithm to calculate.
Anti fuzzy method algorithm has multiple, includes but not limited to minimum maximum basis, maximum method, gravity model appoach, halving method and intermediate maximum method etc.Suitable antifuzzy algorithm can be selected according to the design accuracy of the useful degree of computational resource and requirement.
Due to can under the spirit not deviating from essential characteristic of the present invention, implement the present invention in a variety of manners, therefore present embodiment is illustrative and not restrictive, because scope of the present invention is defined by claims, instead of defined by specification sheets, therefore fall into all changes in the border of claim and boundary, or thus the equivalent of this claim border and boundary is forgiven by claim.
Claims (15)
1. an automobile power supply system, comprising:
Electrical generator;
Storage battery;
DC-DC converter, described storage battery is connected with auto electric equipment through this DC-DC converter;
Control the controller of described electrical generator and the operation of described DC-DC converter,
It is characterized in that, described controller controls automobile start process according to following manner: the dutycycle adjusting described DC-DC converter, with the decline extent control of the operating voltage by described auto electric equipment on preset level.
2. automobile power supply system as claimed in claim 1, wherein, described preset level depends on starting current, the current working current of auto electric equipment and the state-of-charge of described storage battery that described storage battery provides to automobile starter.
3. automobile power supply system as claimed in claim 2, wherein, described preset level represents with the decline percentum of the operating voltage of described auto electric equipment, and it is determined according to following formula:
Here δ is the decline percentum of the operating voltage of described auto electric equipment, and SOC is the state-of-charge of described storage battery, I
sand I
wbe respectively described starting current and current working current, α and β be experiment determine be greater than zero constant.
4. automobile power supply system as claimed in claim 2, wherein, described preset level represents with the decline percentum of the operating voltage of described auto electric equipment, and it is determined according to following manner:
If the state-of-charge of described storage battery is less than first threshold, then described decline percentum is 100%;
If the state-of-charge of described storage battery is more than or equal to first threshold and is less than Second Threshold, then described decline percentum δ is:
Here I
sand I
wbe respectively described starting current and current working current, γ be experiment determine be greater than zero constant;
If the state-of-charge of described storage battery is more than or equal to Second Threshold, then described decline percentum is 0%.
5. automobile power supply system as claimed in claim 4, wherein, described first and second threshold values are respectively 60% and 95%.
6. automobile power supply system as claimed in claim 1, wherein, described electrical generator, storage battery, DC-DC converter are communicated by bus mode with controller.
7. one kind realizes the method for power supply management in automobile start process in automobile power supply system, described automobile power supply system comprises the controller of the described electrical generator of electrical generator, storage battery, DC-DC converter and control and the operation of described DC-DC converter, it is characterized in that, described storage battery is connected with auto electric equipment through described DC-DC converter, and described method comprises the following steps:
In response to automobile start, the preset level of the decline degree of the operating voltage of described auto electric equipment determined by described controller;
Described controller adjusts the dutycycle of DC-DC converter, with the decline extent control of the operating voltage by described auto electric equipment on preset level according to described preset level.
8. method as claimed in claim 7, wherein, described preset level depends on the state-of-charge of the starting current of automobile starter, the current working current of auto electric equipment and described storage battery.
9. method as claimed in claim 8, wherein, described preset level represents with the decline percentum of the operating voltage of described auto electric equipment, and it is determined according to following formula:
Here δ is the decline percentum of the operating voltage of described auto electric equipment, and SOC is the state-of-charge of described storage battery, I
swith 1
wbe respectively described starting current and current working current, α and β be experiment determine be greater than zero constant.
10. method as claimed in claim 8, wherein, described preset level represents with the decline percentum of the operating voltage of described auto electric equipment, and it is determined according to following manner:
If the state-of-charge of described storage battery is less than first threshold, then described decline percentum is 100%;
If the state-of-charge of described storage battery is more than or equal to the mat woven of fine bamboo strips one threshold value and be less than the mat woven of fine bamboo strips two threshold value, then described decline percentum δ is:
Here I
sand I
wbe respectively described starting current and current working current, γ be experiment determine be greater than zero constant;
If the state-of-charge of described storage battery is more than or equal to Second Threshold, then described decline percentum is 0%.
11. methods as claimed in claim 10, wherein, described first and second threshold values are respectively 60% and 95%.
12. methods as claimed in claim 8, wherein, described controller determines the state-of-charge of described storage battery according to following manner:
Input the operating voltage of described storage battery, working current and operating temperature;
Calculate the operating voltage correction of described operating voltage under the standard operation electric current of described storage battery;
Respective subordinate function is utilized to determine the fuzzy value of described operating voltage correction and described operating temperature;
Utilize fuzzy inference rule, determine the fuzzy value of the state-of-charge of described storage battery according to the fuzzy value of described operating voltage correction and described operating temperature; And
Utilize antifuzzy algorithm, calculate the state-of-charge of described storage battery according to the fuzzy value of the state-of-charge of described storage battery.
13. methods as claimed in claim 12, wherein, calculate the operating voltage correction U of described operating voltage under the standard operation electric current of described storage battery according to the following formula
i,m:
U
I,m＝U
I+(I-I
0)×λ(I)
Wherein, U
ifor the described operating voltage under described working current I, U
i,mfor described operating voltage U
icorrection, I is described working current, I
0for described standard operation electric current, λ (I) is the numerical value changed with described working current.
14. methods as claimed in claim 13, wherein, described standard operation electric current be following in one:
The center line average values of the working current under the various working conditions of described storage battery;
Working current under the various mode of operations of described storage battery is according to the weighted average of the mode of operation probability of occurrence of its correspondence;
The aviation value of working current within a period of time of described storage battery.
15. methods as claimed in claim 13, wherein, described λ (I) by storage battery at the same temperature different operating electric current discharge curve obtain.
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