CN108528192A - Hybrid power system based on open winding electric machine and its power distribution method - Google Patents
Hybrid power system based on open winding electric machine and its power distribution method Download PDFInfo
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- CN108528192A CN108528192A CN201810502250.3A CN201810502250A CN108528192A CN 108528192 A CN108528192 A CN 108528192A CN 201810502250 A CN201810502250 A CN 201810502250A CN 108528192 A CN108528192 A CN 108528192A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
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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
- Y02T10/62—Hybrid vehicles
-
- 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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/84—Data processing systems or methods, management, administration
Abstract
The present invention relates to hybrid power systems and power distribution method based on open winding electric machine,It includes engine,Battery,Generator,Open winding electric machine,First inverter,Second inverter,Main reducing gear and control system,Engine can couple with generator drive gear,The output end of generator can be electrically connected under control of the control system with one end of the input terminal of battery and/or second inverter,It charges so that the electric energy of generator output can be battery,The output end of battery is electrically connected with one end of the first inverter,The other end of first inverter is electrically connected with the first input end of open winding electric machine,So that battery can power to the first inverter power supply to open winding electric machine,The other end of second inverter is electrically connected with the second input terminal of open winding electric machine,So that can power to the second inverter power supply to open winding electric machine when driven by engine generator,The output end of open winding electric machine and main reducing gear driving coupling.
Description
Technical field
The present invention relates to automobile hybrid power technical fields, more particularly to a kind of mixing based on open winding electric machine
The power distribution method of dynamical system and hybrid power system based on open winding electric machine.
Background technology
This part provide be only with the relevant background information of the disclosure, be not necessarily the prior art.
The Energy situation and environmental protection pressure increasingly serious in face of global range, new-energy automobile become the new growth in market
Point.Wherein, pure electric automobile has many advantages, such as that no pollution, energy conversion efficiency are high, but since battery is of high cost and course continuation mileage
The problems such as relatively low, makes the cost performance of pure electric automobile that can not contend with conventional engines automobile.And hybrid vehicle can fill
The advantages of engine automobile and electric vehicle are waved in distribution can reduce fuel consumption, improve continual mileage, it has also become solve at this stage
Energy-saving and environmental protection problem realistic plan.
In general, hybrid vehicle is the automobile for carrying out driving energy with 2 kinds or two or more energy source, at this stage
Research is mostly the HEV being made of engine, motor, battery pack.Existing hybrid vehicle generally use DC/DC voltages turn
Parallel operation and it is commonly provided with gearbox etc., this causes vehicle cost higher, and can cause additional power attenuation, reduces driving system
System efficiency.Further, since conventional motors use single inverter, the voltage class of system is higher, and needs concatenated battery section
Number is also more.
Invention content
The purpose of the present invention is at least solving one of above-mentioned problems of the prior art, which is by following skill
What art scheme was realized：
A kind of hybrid power system based on open winding electric machine is provided according to an aspect of the present invention, it is described mixed
It includes engine, battery, generator, open winding electric machine, the first inverter, the second inverter, main deceleration to close dynamical system
Device and control system, wherein the engine can couple with the generator drive gear, and the output end of generator is in control
It can be electrically connected with one end of the input terminal of battery and/or second inverter under the control of system so that the generator is defeated
The electric energy gone out can be that the battery charges, and the output end of the battery is electrically connected with one end of first inverter, described
The other end of first inverter is electrically connected with the first input end of the open winding electric machine so that the battery can be to institute
The first inverter power supply is stated to power to the open winding electric machine, the other end and the opening of second inverter
Second input terminal of formula winding electric machine is electrically connected so that can be to second inversion when generator described in the driven by engine
Device power supply is described to power to the open winding electric machine (while the electric energy that generator exports may be battery charging)
The output end of open winding electric machine and the main reducing gear driving coupling.
Hybrid power system according to the present invention brings following advantageous effects：
Two power sources to winding electric machine offer energy is opened, drive motor rotation, the torque of motor output to pass through master respectively
Retarder passes to rear drive sprocket, realizes the driving of vehicle；Transmission assembly is eliminated, vehicle cost is reduced；Dual intensity can be used
Amount source powers to dynamical system, and the different capacity combination between different-energy source may be implemented, and eliminates original DC/DC electricity
Pressure converter reduces design cost；Compared with the conventional motors of single inverter control, can have using open winding electric machine
Effect reduces DC bus-bar voltage, therefore can reduce the series connection joint number of power accumulator and reduce the voltage class of system.
Further, the open winding electric machine is following motor：The neutral point that the Y type windings of induction machine are connected
It opens and six leads at the neutral point both ends is divided into two groups, first group of connection, first inversion in described two groups
Device, second group of connection, second inverter in described two groups.
The work(of the hybrid power system based on above-mentioned open winding electric machine is provided according to another aspect of the present invention
Rate distribution method, the power distribution method include the following steps：
S1：Determine the parameter of each component, including：Determine the upper limit value SOC of battery charge state SOCmaxAnd lower limiting value
SOCminAnd determine power of battery PbMaximum charge-discharge electric power Pb-maxWith minimum charge-discharge electric power Pb-min；Determine battery capacity Qb、
Internal resistance of cell Rb, open-circuit voltage Uo；Determine the torque T of open winding electric machineMPeak torque TM-maxWith minimal torque TM-min、
The rotating speed w of open winding electric machineMMaximum (top) speed wM-maxWith minimum speed wM-min, open winding electric machine Rated motor electricity
Flow IMmax；Determine the torque T of engineICEPeak torque TICE-maxWith minimal torque TICE-min, engine rotating speed wICEMost
Big rotating speed wICE-maxWith minimum speed wICE-min；Determine speed ratio of main reducer；Determine engine consumption map；
S2：SOC feasible zones are divided, including：Determine the restrictive condition of battery, engine and open winding electric machine, that is,
SOCmin≤SOC≤SOCmax, Pb-min≤Pb≤Pb-max, wICE-min≤wICE≤wICE-max, TICE-min≤TICE≤TICE-max, wM-min
≤wM≤wM-max, TM-min≤TM≤TM-max；The constraint initial SOC and final state SOC of battery is consistent, i.e. SOCstart=
SOCterminal, wherein SOCstartSOC value when representing initial, SOCterminalRepresent SOC value when final state；From SOCstart、
SOCterminalBoth ends are respectively with battery maximum charge-discharge electric power Pb-maxCarry out charge and discharge, the upper limit value SOC until reaching settingmax
With lower limiting value SOCmin, area defined is feasible zone S；
S3：By feasible zone S sliding-model controls, including：Sliding-model control is carried out to the time along driving cycle direction, by the time
Discrete step-length is set to 1 second, and working cycles are divided into N number of step-length, and the right endpoint of each step-length is taken to form N number of discrete system shape
State, note x (k) are k-th of system mode, 1≤k≤N；In the time step after discrete, to the battery charge shape in feasible zone S
State SOC carries out sliding-model control, at x (k), if SOC (k)maxFor the maximum SOC value at x (k) on feasible zone, SOC (k)min
For the minimum SOC value at x (k) on feasible zone, if discrete size isWherein m (k) is indicated
When system mode is x (k) by SOC (k)max、SOC(k)maxBetween be bisected into m (k) parts；It is in SOC in feasible zone in x (k)
Discrete is m+1 point, and note SOC (k, n) is the places x (k) from SOC (k)maxN-th of discrete point from top to bottom, wherein 1≤n≤m+
1；In feasible zone S, since SOC variations are not violent between neighboring system state, it is assumed herein that the open-circuit voltage U of batteryoNo
Become, if the maximum power allowed when battery discharge is Pdischarmax, use IdischarmaxIndicate PdischarmaxCorresponding discharge current,
When system mode is x (k), if a certain discrete point is SOC (k, n), maximum charge power P when chargingcharmaxIt is divided into Brake Energy
The maximum charge power P that amount recycling allows when charging to batterycharmax1It is filled with the maximum allowed when being charged to battery by engine
Electrical power Pcharmax2, that is, when charging, PcharmaxIt is expressed as：Pcharmax=max (Pcharmax1,Pcharmax2), use IcharmaxIndicate it
Charging current；
S4：Calculate engine consumption matrix：The I of charge and dischargecharmax、IdischarmaxAfter determination, discrete point SOC has been determined that
The SOC variation ranges of (k, n), maximum SOC changing values are Δ SOCmax(k, n), i.e. Δ SOCmax(k, n) be discrete point SOC (k,
N) computer capacity of place's engine consumption matrix, traversal calculate entire driving cycle, obtain oil consumption matrix；
S5：According to oil consumption Matrix Solving power distribution track.
Power distribution method according to the present invention brings following advantageous effects：
The present invention calculates oil consumption matrix based on discretization and solves by the way that SOC feasible zones are carried out rational discretization
Power distribution track makes driving cycle add up oil consumption minimum, realizes the global optimization of energy management；The power distribution method is aobvious
The calculation amount in terms of reducing SOC Dynamic Programmings is write, DP (dynamic programming) operation is simplified, to reduce
Calculation amount shortens the calculating time, significantly improves energy content of battery planning ability.
Further, in step s3：Δ (k) is obtained by dichotomy, is included the following steps：
M (k)=1 is enabled, is calculatedWith the value and Δ SOC of Δ (k)max(k, n) is compared
Compared with；
If Δ (k)≤Δ SOCmax(k, n) then obtains the m (k) when system mode is x (k), i.e., is x (k) in system mode
When by SOC (k)max、SOC(k)minBetween be bisected into m (k) parts；
If Δ (k) ＞ Δs SOCmax(k, n) then enables m (k)=m (k)+1, calculates's
Value, if still Δ (k) ＞ Δs SOCmax(k, n) then continues to enable m (k)=m (k)+1, so circulation is gone down, until Δ (k)≤Δ
SOCmaxWhen (k, n), final m (k) is calculated in stopping, at this time when system mode is x (k) by SOC (k)max、SOC(k)minIt
Between be bisected into m (k) parts.
Further, in step s3：
Work as Pcharmax=Pcharmax1When, it is located at the horizontal line l, I for keeping SOC value constant at point SOC (k, n)charmaxWith water
It is θ that horizontal line l, which forms angle,1, IdischarmaxIt is θ to form angle with horizontal line l2, then I at this timecharmaxAnd IdischarmaxAbout level
Line l is asymmetric, at this time θ1＜ θ2；
Work as Pcharmax=Pcharmax2When, I at this timecharmaxAnd IdischarmaxIt is symmetrical about horizontal line l, the two inverse process each other,
θ at this time1=θ2。
Further, step S4 includes：
If SOC (k+1, j) is Δ SOC at (k+1) from SOC (k, n) to system mode xmaxCertain point in (k, n) range,
When system mode changes to SOC (k+1, the j) at x (k+1) from the SOC (k, n) from x (k), wherein SOC (k, n) is to change
The starting point of journey, controlled quentity controlled variable when indicating to change to SOC (k+1, j) from SOC (k, n) with u (k, n, j), wherein u (k, n, j) are logical
Cross Pb(k, n, j) and PICE(k, n, j) is controlled, Pb(k, n, j) and PICE(k, n, j) indicates to change to SOC from SOC (k, n) respectively
The power of battery needed for (k+1, j) and engine power；
According to determining SOC Reachability state sets, in Δ SOCmaxPower of battery P is determined by following formula in (k, n) rangeb：
Wherein, PbFor the power of battery, RbFor the internal resistance of cell, QbFor battery capacity, UoFor open-circuit voltage；
According to the state of cyclic operation demarcated, the vehicle demand power at each place system mode x (k) can be obtained, is denoted as
Preq(k), then open winding electric machine power P (k)=Preq(k)；
Vehicle demand power is subtracted into the power of battery and obtains engine demand power, i.e. PICE(k, n, j)=Preq(k)-Pb
(k,n,j)；
The calculating of oil consumption matrix is compared according to power distribution demand to be judged, corresponding engine consumption value is obtained.
Further, in step s 4：If power distribution demand ratio is r (k, n, j)=PInverse r1(k,n,j)/PInverse r2(k,n,
J), wherein PInverse r1(k,n,j)、PInverse r2First is inverse when (k, n, j) respectively changes to SOC (k+1, j) from discrete point SOC (k, n)
Become the demand power of device and the second inverter, wherein PInverse r1(k, n, j)=Pb(k, n, j), PInverse r2(k, n, j)=PICE(k, n, j),
Open winding electric machine is characterized when changing to SOC (k+1, j) from SOC (k, n) with two inverter power demand assignment ratios
The power distribution ability of demand；
If open winding electric machine power-division ratios r (k)=PInverse 1(k)/PInverse 2(k), wherein PInverse 1(k)、PInverse 2(k) it is respectively
The power of the power of first inverter and the second inverter when system mode is at x (k), that is, PInverse 1(k)=Pb(k), PInverse 2(k)=
PICE(k)；
Open winding electric machine maximum power distribution capability motor maximum power distribution ratio rmax(k) it indicates, as r (k)
Maximum value, rmax(k) [0,1] ∈, uses rmax(k) represent first inverter of the open winding electric machine under the system mode and
The maximum power output ability of second inverter,
Establish open winding electric machine maximum power distribution ratio rmax(k) scheme with the map of system state change；
It is engine consumption value when changing to SOC (k+1, j) from SOC (k, n) to define fuel (k, n, j), indicates this
The engine consumption of process.
Further, power of motor distribution ratio is judged as follows：
When changing to SOC (k+1, j) from SOC (k, n), power distribution demand ratio r (k, n, j) ＞ rmax(k) it when, indicates
Motor the system mode can not power-division ratios output torque as desired, be at this time Failure Control collection, engine consumption value
Fuel (k, n, j) is denoted as+∞, Motor torque TM(k, n, j) and motor speed wM(k, n, j) is denoted as 0, the power of battery at this time and
Engine power is denoted as P respectivelyb(k, n, j)=0, PICE(k, n, j)=0；
As power distribution demand ratio r (k, n, j)≤rmax(k) when, indicate that the system mode does not exceed open winding electricity
The limitation of machine distribution capability, the oil consumption of engine at this time is tabled look-up by the engine consumption map having had built up, according to every
The demand power at one moment selects fuel consumption rate lowest economic area be(k) a certain operating mode in, obtains engine consumption value
Fuel (k, n, j), the power of battery and engine power at this time are denoted as P respectivelyb(k,n,j)、PICE(k,n,j)；
When system mode changes to SOC (k+1, j) from SOC (k, n), judged to obtain fuel consumption values according to power-division ratios
There is the set that fuel consumption values fuel (k, n, j) is formed in the places x (k) by fuel (k, n, j), and system mode is in x in referred to as feasible zone S
(k) the oil consumption set fuel (k) at place, the corresponding power of battery and engine power Pb(k,n,j)、PICE(k, n, j) is formed
Collection is combined into Pb(k)、PICE(k)；
Oil consumption matrix is denoted as F={ fuel (k) | 1≤k≤N }.
Further, step S5 includes：
The optimization aim that driving cycle adds up oil consumption minimum is set to be expressed as：
When system mode is x (k), 1≤k≤N, if recursion equation is：
Jk=min [fuel (SOC (k), Pb(k),PICE(k))+Jk+1((SOC (k))], J in formulakIt represents from kth step to N
The accumulative mimimum fuel consumption of step；
By way of recursive call, from final state backstepping to original state, traversal searching process is completed, acquisition makes oil
Consume minimum power distribution track；
Mimimum fuel consumption power distribution track sets are denoted as：
U=argmin [fuel (SOC (k), Pb(k),PICE(k))+Jk+1((SOC(k))]。
Further, before the judgement of power of motor distribution ratio, preliminary screening is carried out to discrete point at x (k+1), including as follows
Step：
The maximum allowable discharge power of system mode battery at x (k)Its is corresponding
Battery maximum discharge current is
If the system mode maximum discharge coefficient that battery allows at x (k)
It is located at the horizontal line l, I for keeping SOC value constant at point SOC (k, n)charmaxIt is θ to form angle with horizontal line l1,
IdischarmaxIt is θ to form angle with horizontal line l2, thenIt is θ to form angle with horizontal line l3=k × θ2, system mode
For the computer capacity Δ SOC of discrete point on a certain discrete point SOC (k, n) on x (k) to x (k+1)max(k, n) can be reduced to
By preliminary screening, the discrete point that SOC (k, n) is not achieved is excluded, in its determinationIt is interior into
Row power-division ratios judge, the time is calculated to reduce calculation amount, shorten.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is the schematic diagram according to the hybrid power system based on open winding electric machine of embodiment of the present invention；
Fig. 2 is the power distribution side according to the hybrid power system based on open winding electric machine of embodiment of the present invention
The flow chart of method；
Fig. 3 schematically shows the division of the feasible zone S according to the power distribution method of embodiment of the present invention；
At the discretization according to the feasible zone S of the power distribution method of embodiment of the present invention
Reason；
Fig. 5 schematically shows the feasible zone S according to the power distribution method of embodiment of the present invention in Pcharmax=
Pcharmax1When Δ SOCmax(k, n)；
Fig. 6 schematically shows the feasible zone S according to the power distribution method of embodiment of the present invention in Pcharmax=
Pcharmax2When Δ SOCmax(k, n)；
Fig. 7 is schematically shown according to the power distribution method of embodiment of the present invention in system mode from x (k)
SOC (k, n) change to x (k+1)) at SOC (k+1, j) when u (k, n.j) change procedure；
Fig. 8 schematically shows maximum according to the open winding electric machine of the power distribution method of embodiment of the present invention
Power-division ratios rmax(k) scheme with the map of system mode (operating mode) variation；
Fig. 9 is schematically shown according to the power distribution method of embodiment of the present invention to discrete click-through at x (k+1)
The schematic diagram of row preliminary screening.
Specific implementation mode
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened completely is communicated to those skilled in the art.
As shown in Figure 1, according to embodiment of the present invention, it is proposed that a kind of mixing based on open winding electric machine
Dynamical system 100, the hybrid power system 100 include engine 10, battery 20, generator 30, open winding electric machine 40,
First inverter 51, the second inverter 52, main reducing gear 60 and control system (not shown), wherein 10 energy of the engine
It is enough with 30 driving coupling of the generator, the output end of the generator 30 is under control of the control system (such as according to mixed dynamic
The different capacity of Force system requires to control) it can be with the input terminal of the battery 20 and/or one end electricity of the second inverter 52
Connection, as shown in the charging circuit that dotted line indicates in Fig. 1 so that the electric energy that the generator 30 exports can be the battery 20
Charging, the output end of the battery 20 is electrically connected with one end of first inverter 51, first inverter 51 it is another
End is electrically connected with the first input end of the open winding electric machine 40 so that the battery 20 can be to first inverter
51 power supplies to the open winding electric machine 40 to power, the other end of second inverter 52 and the open winding
Second input terminal of motor 40 is electrically connected so that the engine 10 can be to second inversion when driving the generator 30
The power supply of device 52 is described to open as shown in the electrical connection that heavy line indicates in Fig. 1 to power to the open winding electric machine 40
The output end and 50 driving coupling of the main reducing gear for putting formula winding electric machine 40, such as the mechanical connection institute that fine line indicates in Fig. 1
Show.
Hybrid power system according to the present invention brings following advantageous effects：Transmission assembly is eliminated, is reduced
Vehicle cost；Dual energy source can be used to power to dynamical system, the different capacity combination between different-energy source may be implemented,
And original DC/DC electric pressure converters are eliminated, design cost is reduced；Compared with the conventional motors of single inverter control, answer
DC bus-bar voltage can be effectively reduced with open winding electric machine, therefore the series connection joint number and drop of power accumulator can be reduced
The voltage class of low system.
In addition, the main reducing gear 50 can be sequentially connected with driving wheel 71 and driving wheel 72, wherein driving wheel can be
Trailing wheel may be front-wheel.
Further, the open winding electric machine 40 is following motor：The neutrality that the Y type windings of induction machine are connected
Point is opened and six leads at the neutral point both ends is divided into two groups, first group of connection, first inversion in described two groups
Device 51, second group of connection in described two groups second inverter 52.
Referring now to fig. 1 to Fig. 9, describe to provide according to another aspect of the present invention electric based on above-mentioned open winding
The power distribution method of the hybrid power system of machine, the power distribution method include the following steps：
S1：Determine the parameter of each component, including：Determine the upper limit value SOC of battery charge state SOCmaxAnd lower limiting value
SOCmin(i.e. battery is often with the upper lower limit value of working space) simultaneously determines power of battery PbMaximum charge-discharge electric power Pb-maxAnd minimum
Charge-discharge electric power Pb-min；Determine battery capacity Qb, internal resistance of cell Rb, open-circuit voltage Uo(battery model is simplified to by voltage source and
The equivalent circuit of resistance composition, does not consider influence of the temperature change to performance, while ignoring since the presence of internal capacitance causes
Transient process, and assume that charge and discharge process characteristic is identical)；Determine the torque T of open winding electric machineMPeak torque
TM-maxWith minimal torque TM-min, open winding electric machine rotating speed wMMaximum (top) speed wM-maxWith minimum speed wM-min, it is open
The rated current of motor I of winding electric machineMmax；Determine the torque T of engineICEPeak torque TICE-maxAnd minimal torque
TICE-min, engine rotating speed wICEMaximum (top) speed wICE-maxWith minimum speed wICE-min；Determine speed ratio of main reducer；Determine hair
Motivation oil consumption map；
S2：SOC feasible zones are divided, including：Determine the restrictive condition of battery, engine and open winding electric machine, that is,
SOCmin≤SOC≤SOCmax, Pb-min≤Pb≤Pb-max, wICE-min≤wICE≤wICE-max, TICE-min≤TICE≤TICE-max, wM-min
≤wM≤wM-max, TM-min≤TM≤TM-max；The constraint initial SOC and final state SOC of battery is consistent, i.e. SOCstart=
SOCterminal, wherein SOCstartSOC value when representing initial, SOCterminalRepresent SOC value when final state；From SOCstart、
SOCterminalBoth ends are respectively with battery maximum charge-discharge electric power Pb-maxCarry out charge and discharge, the upper limit value SOC until reaching settingmax
With lower limiting value SOCmin, area defined is feasible zone S, as shown in Figure 3；It should be pointed out that for the rotating speed of engine
Conventional sensor may be used with torque, the rotating speed of motor and torque etc. to measure and input control system, therefore in text
It repeats no more.
S3：By feasible zone S sliding-model controls, including：Sliding-model control is carried out to the time along driving cycle direction, by the time
Discrete step-length is set to 1 second, and working cycles are divided into N number of step-length, and the right endpoint of each step-length is taken to form N number of discrete system shape
State, note x (k) are k-th of system mode, 1≤k≤N；In the time step after discrete, to the battery charge shape in feasible zone S
State SOC carries out sliding-model control, at x (k), if SOC (k)maxFor the maximum SOC value at x (k) on feasible zone, SOC (k)min
For the minimum SOC value at x (k) on feasible zone, if discrete size isWherein m (k) is indicated
When system mode is x (k) by SOC (k)max、SOC(k)maxBetween be bisected into m (k) parts；It is in SOC in feasible zone in x (k)
Discrete is m+1 point, and note SOC (k, n) is the places x (k) from SOC (k)maxN-th of discrete point from top to bottom, wherein 1≤n≤m+
1, as shown in Figure 4；In feasible zone S, since SOC variations are not violent between neighboring system state, it is assumed herein that battery is opened
Road voltage UoIt is constant, if the maximum power allowed when battery discharge is Pdischarmax, use IdischarmaxIndicate PdischarmaxIt is corresponding
Discharge current, when system mode is x (k), if a certain discrete point is SOC (k, n), maximum charge power P when chargingcharmaxPoint
The maximum charge power P allowed when charging to battery for Brake energy recoverycharmax1Allow with when being charged to battery by engine
Maximum charge power Pcharmax2, that is, when charging, PcharmaxIt is expressed as：Pcharmax=max (Pcharmax1,Pcharmax2), it uses
IcharmaxIndicate its charging current；
S4：Calculate engine consumption matrix：The I of charge and dischargecharmax、IdischarmaxAfter determination, discrete point SOC has been determined that
The SOC variation ranges of (k, n), maximum SOC changing values are Δ SOCmax(k, n), i.e. Δ SOCmax(k, n) be discrete point SOC (k,
N) computer capacity of place's engine consumption matrix, traversal calculate entire driving cycle, obtain oil consumption matrix；
S5：According to oil consumption Matrix Solving power distribution track.
Power distribution method according to the present invention brings following advantageous effects：The present invention is by by SOC feasible zones
Rational discretization is carried out, and oil consumption matrix is calculated based on discretization and solves power distribution track, makes the accumulative oil of driving cycle
Consumption is minimum, realizes the global optimization of energy management；The power distribution method is precisely efficient, significantly reduces SOC Dynamic Programmings
The calculation amount of aspect simplifies DP operations, so as to shorten the calculating time, significantly improves to the comprehensive of energy content of battery planning calculating
Close efficiency.
Further, in step s3：Δ (k) is obtained by dichotomy, is included the following steps：
M (k)=1 is enabled, is calculatedWith the value and Δ SOC of Δ (k)max(k, n) is compared
Compared with；
If Δ (k)≤Δ SOCmax(k, n) then obtains the m (k) when system mode is x (k), i.e., is x (k) in system mode
When by SOC (k)max、SOC(k)minBetween be bisected into m (k) parts；
If Δ (k) ＞ Δs SOCmax(k, n) then enables m (k)=m (k)+1, calculates's
Value, if still Δ (k) ＞ Δs SOCmax(k, n) then continues to enable m (k)=m (k)+1, so circulation is gone down, until Δ (k)≤Δ
SOCmaxWhen (k, n), final m (k) is calculated in stopping, at this time when system mode is x (k) by SOC (k)max、SOC(k)minIt
Between be bisected into m (k) parts.
Further, in step s3：
Work as Pcharmax=Pcharmax1When, it is located at the horizontal line l, I for keeping SOC value constant at point SOC (k, n)charmaxWith water
It is θ that horizontal line l, which forms angle,1, IdischarmaxIt is θ to form angle with horizontal line l2, then I at this timecharmaxAnd IdischarmaxAbout level
Line l is asymmetric, at this time θ1＜ θ2, as shown in Figure 5；
Work as Pcharmax=Pcharmax2When, I at this timecharmaxAnd IdischarmaxIt is symmetrical about horizontal line l, the two inverse process each other,
θ at this time1=θ2, as shown in Figure 6.
Further, step S4 includes：
If SOC (k+1, j) is Δ SOC at (k+1) from SOC (k, n) to system mode xmaxCertain point in (k, n) range,
When system mode changes to SOC (k+1, the j) at x (k+1) from the SOC (k, n) from x (k), wherein SOC (k, n) is to change
The starting point of journey, controlled quentity controlled variable when indicating to change to SOC (k+1, j) from SOC (k, n) with u (k, n, j), wherein u (k, n, j) are logical
Cross Pb(k, n, j) and PICE(k, n, j) is controlled, Pb(k, n, j) and PICE(k, n, j) indicates to change to SOC from SOC (k, n) respectively
The power of battery needed for (k+1, j) and engine power, as shown in Figure 7；
According to determining SOC Reachability state sets, in Δ SOCmaxPower of battery P is determined by following formula in (k, n) rangeb：
Wherein, PbFor the power of battery, RbFor the internal resistance of cell, QbFor battery capacity, UoFor open-circuit voltage；
According to the state of cyclic operation demarcated, the vehicle demand power at each place system mode x (k) can be obtained, is denoted as
Preq(k), then open winding electric machine power P (k)=Preq(k)；
Vehicle demand power is subtracted into the power of battery and obtains engine demand power, i.e. PICE(k, n, j)=Preq(k)-Pb
(k,n,j)；
The calculating of oil consumption matrix is compared according to power distribution demand to be judged, corresponding engine consumption value is obtained.
It should be pointed out that due to the limitation of open winding electric machine distribution capability, need to compare oil according to power distribution
Consumption matrix calculating is judged, corresponding engine consumption value is obtained.
Further, in step s 4：
If power distribution demand ratio is r (k, n, j)=PInverse r1(k,n,j)/PInverse r2(k, n, j), wherein PInverse r1(k,n,j)、
PInverse r2(k, n, j) is respectively the need of the first inverter and the second inverter when changing to SOC (k+1, j) from discrete point SOC (k, n)
Ask power, wherein PInverse r1(k, n, j)=Pb(k, n, j), PInverse r2(k, n, j)=PICE(k, n, j), with two inverter power demands
Distribution ratio characterizes the power distribution ability of open winding electric machine demand when changing to SOC (k+1, j) from SOC (k, n)；
If open winding electric machine power-division ratios r (k)=PInverse 1(k)/PInverse 2(k), wherein PInverse 1(k)、PInverse 2(k) it is respectively
The power of the power of first inverter and the second inverter when system mode is at x (k), that is, PInverse 1(k)=Pb(k), PInverse 2(k)=
PICE(k)；
Open winding electric machine maximum power distribution capability motor maximum power distribution ratio rmax(k) it indicates, as r (k)
Maximum value, rmax(k) [0,1] ∈, uses rmax(k) represent first inverter of the open winding electric machine under the system mode and
The maximum power output ability of second inverter,
Establish open winding electric machine maximum power distribution ratio rmax(k) scheme with the map of system state change, such as Fig. 8 institutes
Show；
It is engine consumption value when changing to SOC (k+1, j) from SOC (k, n) to define fuel (k, n, j), indicates this
The engine consumption of process.
Further, power of motor distribution ratio is judged as follows：
When changing to SOC (k+1, j) from SOC (k, n), power distribution demand ratio r (k, n, j) ＞ rmax(k) it when, indicates
Motor the system mode can not power-division ratios output torque as desired, be at this time Failure Control collection, engine consumption value
Fuel (k, n, j) is denoted as+∞, Motor torque TM(k, n, j) and motor speed wM(k, n, j) is denoted as 0, the power of battery at this time and
Engine power is denoted as P respectivelyb(k, n, j)=0, PICE(k, n, j)=0；
As power distribution demand ratio r (k, n, j)≤rmax(k) when, indicate that the system mode does not exceed open winding electricity
The limitation of machine distribution capability, the oil consumption of engine at this time is tabled look-up by the engine consumption map having had built up, according to every
The demand power at one moment selects fuel consumption rate lowest economic area be(k) a certain operating mode in, obtains engine consumption value
Fuel (k, n, j), the power of battery and engine power at this time are denoted as P respectivelyb(k,n,j)、PICE(k,n,j)；
When system mode changes to SOC (k+1, j) from SOC (k, n), judged to obtain fuel consumption values according to power-division ratios
There is the set that fuel consumption values fuel (k, n, j) is formed in the places x (k) by fuel (k, n, j), and system mode is in x in referred to as feasible zone S
(k) the oil consumption set fuel (k) at place, the corresponding power of battery and engine power Pb(k,n,j)、PICE(k, n, j) is formed
Collection is combined into Pb(k)、PICE(k)；
Oil consumption matrix is denoted as F={ fuel (k) | 1≤k≤N }.
Further, step S5 includes：
The optimization aim that driving cycle adds up oil consumption minimum is set to be expressed as：
When system mode is x (k), 1≤k≤N, if recursion equation is：
Jk=min [fuel (SOC (k), Pb(k),PICE(k))+Jk+1((SOC (k))], J in formulakIt represents from kth step to N
The accumulative mimimum fuel consumption of step；
By way of recursive call, from final state backstepping to original state, traversal searching process is completed, acquisition makes oil
Consume minimum power distribution track；
Mimimum fuel consumption power distribution track sets are denoted as：
U=argmin [fuel (SOC (k), Pb(k),PICE(k))+Jk+1((SOC (k))], sequence U can be stored just
It is called in control system.
Further, before the judgement of power of motor distribution ratio, preliminary screening is carried out to discrete point at x (k+1), including as follows
Step：
The maximum allowable discharge power of system mode battery at x (k)Its is corresponding
Battery maximum discharge current is
If the system mode maximum discharge coefficient that battery allows at x (k)
It is located at the horizontal line l, I for keeping SOC value constant at point SOC (k, n)charmaxIt is θ to form angle with horizontal line l1,
IdischarmaxIt is θ to form angle with horizontal line l2, thenIt is θ to form angle with horizontal line l3=k × θ2, such as Fig. 9 institutes
Show, system mode is computer capacity Δ SOC of a certain discrete point SOC (k, n) on x (k) to discrete point on x (k+1)max(k,n)
It can be reduced to
By preliminary screening, the discrete point that SOC (k, n) is not achieved is excluded, in its determinationIt is interior into
Row power-division ratios judge, the time is calculated to reduce calculation amount, shorten.
It should be understood that term used herein merely for description particular example embodiment purpose, and have no intention into
Row limitation.The terms "include", "comprise", " containing " and " having " are inclusives, and therefore indicate stated feature,
The presence of step, operations, elements, and/or components, but be not precluded presence or add one or more of the other feature, step,
Operation, component, assembly unit, and/or combination thereof.Method and step, process and the operation of described in the text are not interpreted as having to
It asks them to be executed with described or explanation particular order, executes sequence unless explicitly stated otherwise.
Although can in the text using term first, second, third, etc. come describe multiple element, component, region, layer and/
Or section still these component, assembly units, region, layer and/or is limited by these terms than Duan Buying.These terms can be only
For a component, assembly unit, region, layer or section are distinguished with another region, layer or section.Unless context clearly refers to
Go out, do not implied that when otherwise the term and other numerical terms of such as " first ", " second " etc use in the text sequence or
Person's order.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (10)
1. a kind of hybrid power system based on open winding electric machine, which is characterized in that the hybrid power system includes hair
Motivation, battery, generator, open winding electric machine, the first inverter, the second inverter, main reducing gear and control system,
In, the engine can couple with the generator drive gear, and the output end of generator under control of the control system can be with
One end of the input terminal of battery and/or second inverter is electrically connected so that the electric energy of the generator output can be institute
State battery charging, the output end of the battery is electrically connected with one end of first inverter, first inverter it is another
End is electrically connected with the first input end of the open winding electric machine so that the battery can be to first inverter power supply
To power to the open winding electric machine, the other end of second inverter and the second of the open winding electric machine
Input terminal is electrically connected so that can be to second inverter power supply thus to described when generator described in the driven by engine
Open winding electric machine power supply, the output end of the open winding electric machine and the main reducing gear driving coupling.
2. the hybrid power system according to claim 1 based on open winding electric machine, which is characterized in that the opening
Formula winding electric machine is following motor：The neutral point that the Y type windings of induction machine are connected is opened and by the neutral point both ends
Six leads are divided into two groups, first group of connection, first inverter in described two groups, second group of connection in described two groups
Second inverter.
3. a kind of power distribution method of the hybrid power system based on open winding electric machine, the power distribution method is root
Implemented based on the hybrid power system of open winding electric machine according to as claimed in claim 1 or 2, which is characterized in that described
Power distribution method includes the following steps：
S1：Determine the parameter of each component, including：Determine the upper limit value SOC of battery charge state SOCmaxWith lower limiting value SOCminAnd
Determine power of battery PbMaximum charge-discharge electric power Pb-maxWith minimum charge-discharge electric power Pb-min；Determine battery capacity Qb, in battery
Hinder Rb, open-circuit voltage Uo；Determine the torque T of open winding electric machineMPeak torque TM-maxWith minimal torque TM-min, it is open
The rotating speed w of winding electric machineMMaximum (top) speed wM-maxWith minimum speed wM-min, open winding electric machine rated current of motor
IMmax；Determine the torque T of engineICEPeak torque TICE-maxWith minimal torque TICE-min, engine rotating speed wICEMaximum
Rotating speed wICE-maxWith minimum speed wICE-min；Determine speed ratio of main reducer；Determine engine consumption map；
S2：SOC feasible zones are divided, including：Determine the restrictive condition of battery, engine and open winding electric machine, that is, SOCmin
≤SOC≤SOCmax, Pb-min≤Pb≤Pb-max, wICE-min≤wICE≤wICE-max, TICE-mim≤TICE≤TICE-max, wM-min≤wM≤
wM-max, TM-min≤TM≤TM-max；The constraint initial SOC and final state SOC of battery is consistent, i.e. SOCstart=SOCterminal, wherein
SOCstartSOC value when representing initial, SOCterminalRepresent SOC value when final state；From SOCstart、SOCterminalDistinguish at both ends
With battery maximum charge-discharge electric power Pb-maxCarry out charge and discharge, the upper limit value SOC until reaching settingmaxWith lower limiting value SOCmin, institute
The region surrounded is feasible zone S；
S3：By feasible zone S sliding-model controls, including：Sliding-model control is carried out to the time along driving cycle direction, by time discrete
Step-length be set to 1 second, working cycles are divided into N number of step-length, the right endpoint of each step-length is taken to form N number of discrete system mode,
Remember that x (k) is k-th of system mode, 1≤k≤N；In the time step after discrete, to the battery state of charge in feasible zone S
SOC carries out sliding-model control, at x (k), if SOC (k)maxFor the maximum SOC value at x (k) on feasible zone, SOC (k)minFor
Minimum SOC value at the x (k) on feasible zone, if discrete size isWherein m (k) is indicated
By SOC (k) when system mode is x (k)max、SOC(k)maxBetween be bisected into m (k) parts；X (k) be in feasible zone by SOC from
It dissipates for m+1 point, note SOC (k, n) is the places x (k) from SOC (k)maxN-th of discrete point from top to bottom, wherein 1≤n≤m+1；
In feasible zone S, since SOC variations are not violent between neighboring system state, it is assumed herein that the open-circuit voltage U of batteryoIt is constant,
If the maximum power allowed when battery discharge is Pdischarmax, use IdischarmaxIndicate PdischarmaxCorresponding discharge current, when being
When system state is x (k), if a certain discrete point is SOC (k, n), maximum charge power P when chargingcharmaxIt is divided into braking energy to return
The maximum charge power P that receipts allow when charging to batterycharmax1With the maximum charge work(allowed when being charged to battery by engine
Rate Pcharmax2, that is, when charging, PcharmaxIt is expressed as：Pcharmax=max (Pcharmax1,Pcharmax2), use IcharmaxIndicate its charging
Electric current；
S4：Calculate engine consumption matrix：The I of charge and dischargecharmax、IdischarmaxAfter determination, determined that discrete point SOC (k,
N) SOC variation ranges, maximum SOC changing values are Δ SOCmax(k, n), i.e. Δ SOCmax(k, n) is discrete point SOC (k, n)
Locate the computer capacity of engine consumption matrix, traversal calculates entire driving cycle, obtains oil consumption matrix；
S5：According to oil consumption Matrix Solving power distribution track.
4. the power distribution method of the hybrid power system according to claim 3 based on open winding electric machine, special
Sign is, in step s3：Δ (k) is obtained by dichotomy, is included the following steps：
M (k)=1 is enabled, is calculatedWith the value and Δ SOC of Δ (k)max(k, n) is compared；
If Δ (k)≤Δ SOCmax(k, n) then obtains the m (k) when system mode is x (k), i.e., will when system mode is x (k)
SOC(k)max、SOC(k)minBetween be bisected into m (k) parts；
If Δ (k) ＞ Δs SOCmax(k, n) then enables m (k)=m (k)+1, calculatesValue, if also
It is Δ (k) ＞ Δs SOCmax(k, n) then continues to enable m (k)=m (k)+1, so circulation is gone down, until Δ (k)≤Δ SOCmax(k,
When n), final m (k) is calculated in stopping, at this time when system mode is x (k) by SOC (k)max、SOC(k)minBetween be bisected into
M (k) parts.
5. the power distribution method of the hybrid power system according to claim 3 based on open winding electric machine, special
Sign is, in step s3：
Work as Pcharmax=Pcharmax1When, it is located at the horizontal line l, I for keeping SOC value constant at point SOC (k, n)charmaxWith horizontal line l
It is θ to form angle1, IdischarmaxIt is θ to form angle with horizontal line l2, then I at this timecharmaxAnd IdischarmaxNot about horizontal line l
Symmetrically, θ at this time1＜ θ2；
Work as Pcharmax=Pcharmax2When, I at this timecharmaxAnd IdischarmaxIt is symmetrical about horizontal line l, the two inverse process each other, at this time
θ1=θ2。
6. the power distribution method of the hybrid power system according to claim 4 based on open winding electric machine, special
Sign is that step S4 includes：
If SOC (k+1, j) is Δ SOC at (k+1) from SOC (k, n) to system mode xmaxCertain point in (k, n) range, when being
When system state changes to SOC (k+1, the j) at x (k+1) from the SOC (k, n) from x (k), wherein SOC (k, n) is change procedure
Starting point, controlled quentity controlled variable when indicating to change to SOC (k+1, j) from SOC (k, n) with u (k, n, j), wherein u (k, n, j) pass through Pb
(k, n, j) and PICE(k, n, j) is controlled, Pb(k, n, j) and PICE(k, n, j) indicates to change to SOC (k+ from SOC (k, n) respectively
1, j) power of battery needed for and engine power；
According to determining SOC Reachability state sets, in Δ SOCmaxPower of battery P is determined by following formula in (k, n) rangeb：
Wherein, PbFor the power of battery, RbFor the internal resistance of cell, QbFor battery capacity, UoFor open-circuit voltage；
According to the state of cyclic operation demarcated, the vehicle demand power at each place system mode x (k) can be obtained, P is denoted asreq
(k), then open winding electric machine power P (k)=Preq(k)；
Vehicle demand power is subtracted into the power of battery and obtains engine demand power, i.e. PICE(k, n, j)=Preq(k)-Pb(k,n,
j)；
The calculating of oil consumption matrix is compared according to power distribution demand to be judged, corresponding engine consumption value is obtained.
7. the power distribution method of the hybrid power system according to claim 6 based on open winding electric machine, special
Sign is,
In step s 4：If power distribution demand ratio is r (k, n, j)=PInverse r1(k,n,j)/PInverse r2(k, n, j), wherein PInverse r1(k,
n,j)、PInverse r2(k, n, j) is respectively the first inverter and the second inverter when changing to SOC (k+1, j) from discrete point SOC (k, n)
Demand power, wherein PInverse r1(k, n, j)=Pb(k, n, j), PInverse r2(k, n, j)=PICE(k, n, j), with two inverter powers
Demand assignment ratio characterizes the power distribution energy of open winding electric machine demand when changing to SOC (k+1, j) from SOC (k, n)
Power；
If open winding electric machine power-division ratios r (k)=PInverse 1(k)/PInverse 2(k), wherein PInverse 1(k)、PInverse 2(k) it is respectively system shape
The power of the power of first inverter and the second inverter when state is at x (k), that is, PInverse 1(k)=Pb(k), PInverse 2(k)=PICE
(k)；
Open winding electric machine maximum power distribution capability motor maximum power distribution ratio rmax(k) it indicates, as r (k) is most
Big value, rmax(k) [0,1] ∈, uses rmax(k) first inverter and second of the open winding electric machine under the system mode is represented
The maximum power output ability of inverter,
Establish open winding electric machine maximum power distribution ratio rmax(k) scheme with the map of system state change；
It is engine consumption value when changing to SOC (k+1, j) from SOC (k, n) to define fuel (k, n, j), indicates this process
Engine consumption.
8. the power distribution method of the hybrid power system according to claim 7 based on open winding electric machine, special
Sign is, is judged as follows power of motor distribution ratio：
When changing to SOC (k+1, j) from SOC (k, n), power distribution demand ratio r (k, n, j) ＞ rmax(k) when, motor is indicated
The system mode can not power-division ratios output torque as desired, be at this time Failure Control collection, engine consumption value fuel
(k, n, j) is denoted as+∞, Motor torque TM(k, n, j) and motor speed wM(k, n, j) is denoted as 0, the power of battery at this time and starts
Acc power is denoted as P respectivelyb(k, n, j)=0, PICE(k, n, j)=0；
As power distribution demand ratio r (k, n, j)≤rmax(k) when, indicate that the system mode does not exceed open winding electric machine point
Limitation with ability, the oil consumption of engine at this time is tabled look-up by the engine consumption map having had built up, according to per a period of time
The demand power at quarter selects fuel consumption rate lowest economic area be(k) a certain operating mode in obtains engine consumption value fuel
(k, n, j), the power of battery and engine power at this time are denoted as P respectivelyb(k,n,j)、PICE(k,n,j)；
When system mode changes to SOC (k+1, j) from SOC (k, n), judged to obtain fuel consumption values fuel according to power-division ratios
There is the set that fuel consumption values fuel (k, n, j) is formed in the places x (k) by (k, n, j), and system mode is at x (k) in referred to as feasible zone S
Oil consumption set fuel (k), the corresponding power of battery and engine power Pb(k,n,j)、PICEThe set that (k, n, j) is formed
For Pb(k)、PICE(k)；
Oil consumption matrix is denoted as F={ fuel (k) | 1≤k≤N }.
9. the power distribution method of the hybrid power system according to claim 8 based on open winding electric machine, special
Sign is that step S5 includes：
The optimization aim that driving cycle adds up oil consumption minimum is set to be expressed as：
When system mode is x (k), 1≤k≤N, if recursion equation is：
Jk=min [fuel (SOC (k), Pb(k),PICE(k))+Jk+1((SOC (k))], J in formulakRepresentative is walked from kth step to N
Accumulative mimimum fuel consumption；
By way of recursive call, from final state backstepping to original state, traversal searching process is completed, acquisition makes oil consumption most
Small power distribution track；
Mimimum fuel consumption power distribution track sets are denoted as：
U=argmin [fuel (SOC (k), Pb(k),PICE(k))+Jk+1((SOC(k))]。
10. the power distribution method of the hybrid power system according to claim 8 based on open winding electric machine, special
Sign is, before the judgement of power of motor distribution ratio, carries out preliminary screening to discrete point at x (k+1), includes the following steps：
The maximum allowable discharge power of system mode battery at x (k)Its corresponding battery
Maximum discharge current is
If the system mode maximum discharge coefficient that battery allows at x (k)
It is located at the horizontal line l, I for keeping SOC value constant at point SOC (k, n)charmaxIt is θ to form angle with horizontal line l1,
IdischarmaxIt is θ to form angle with horizontal line l2, thenIt is θ to form angle with horizontal line l3=k × θ2, system mode
For the computer capacity Δ SOC of discrete point on a certain discrete point SOC (k, n) on x (k) to x (k+1)max(k, n) can be reduced to
By preliminary screening, the discrete point that SOC (k, n) is not achieved is excluded, in its determinationInterior carry out work(
Rate distribution ratio judges, the time is calculated to reduce calculation amount, shorten.
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