CN109747626A - A kind of torque-demand analytic method that parallel connection plug-in hybrid electric vehicle power is optimal - Google Patents
A kind of torque-demand analytic method that parallel connection plug-in hybrid electric vehicle power is optimal Download PDFInfo
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- CN109747626A CN109747626A CN201910197118.0A CN201910197118A CN109747626A CN 109747626 A CN109747626 A CN 109747626A CN 201910197118 A CN201910197118 A CN 201910197118A CN 109747626 A CN109747626 A CN 109747626A
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The invention discloses a kind of torque-demand analytic method that plug-in hybrid electric vehicle power in parallel is optimal, this method first determines whether operating mode locating for vehicle, vehicle output torque is correspondingly solved according to different working modes.By solve battery requirements power, judge battery requirements power whether the limitation by battery maximum discharge power, if there is no limit, two motors all export corresponding torque capacity under respective revolving speed, and couple motor torque and obtain vehicle output torque；Conversely, passing through the two-dimentional torque Ergodic Matrices of main motor and auxiliary motor, two motor torques are redistributed, and couple motor torque, so that total output torque of vehicle is maximum under conditions of battery maximum discharge power restriction cancellation.The method of the present invention is based on main motor and auxiliary motor two dimension torque Ergodic Matrices, therefore resulting total output torque is exportable theoretical maximum under each speed of automobile, improves power performance and driving experience.
Description
Technical field
The invention belongs to pure electric automobile technical field, in particular to a kind of parallel double drive motor plug-in hybrid power
The optimal torque-demand analytic method of automobile power.
Background technique
As energy and environment problem becomes increasingly conspicuous, energy conservation increasingly causes national governments and the people with new-energy automobile
Concern.Plug-in hybrid vehicle has been provided simultaneously with pure electric vehicle and traditional oils electricity mixes motor-car as a kind of new-energy automobile
Advantage, and course continuation mileage more preferable relative to pure electric vehicle dynamic property is higher, and mixing motor-car relative to traditional oils electricity can be more
Short distance zero-emission is realized using electric energy, therefore becomes instantly most promising new-energy automobile.Carry double drive motor
Plug-in hybrid vehicle, dynamic property is splendid, and become more vehicles enterprise gives priority to target.
The drive mode of parallel double drive motor plug-in hybrid vehicle includes electric-only mode and mixed dynamic model in parallel
Formula, wherein electric-only mode includes single motor driving and Dual-motors Driving mode, and the mixed dynamic model formula of parallel connection includes that single motor parallel connection is mixed
Dynamic model formula and bi-motor parallel connection mix dynamic model formula.A kind of torque that parallel double drive motor plug-in hybrid electric vehicle power is optimal
Demand analytic method has fully considered all drive modes and has made the power between three power sources based on a gearbox
Coupling output is optimal, for sufficiently improve multi power source plug-in hybrid vehicle dynamic property provide well reference according to
According to the field not yet related invention.
Summary of the invention
To achieve the above object, a kind of planet Series-Parallel HEV operator demand according to an embodiment of the present invention
Torque calculation method, comprising the following steps:
A, the identification of operating mode
Operating mode is divided into pure electrician's operation mode and two kinds of parallel operation mode, and when pure electrician's operation mode, engine is not joined
With driving, output torque TengIt is 0, main motor participates in driving or auxiliary motor participates in driving or main motor and auxiliary motor simultaneously participates in
Driving；When parallel operation mode, engine participates in driving, output torque TengIt is obtained by engine speed interpolation external characteristic curve,
Main motor participates in driving simultaneously or auxiliary motor participates in driving or main motor and auxiliary motor simultaneously participates in driving；By judging battery
Whether SOC reaches pattern switching threshold value, to select operating mode；
B, battery requirements power solves
Vehicle Speed V is for calculating main motor revolving speed SMG1With auxiliary motor revolving speed SMG2, calculation formula is as follows:
SMG1=V/R × i0/0.377 (1)
SMG2=SMG1×igb (2)
S in formulaMG1For main motor speed, unit r/min；SMG2Supplemented by motor speed, unit r/min；V is speed, unit
km/h；R is vehicle wheel roll radius, unit m；i0For speed ratio of main reducer；igbFor transmission gear ratio；
Utilize main motor revolving speed SMG1With auxiliary motor revolving speed SMG2Main electricity under current rotating speed is solved by interpolation external characteristic curve
The exportable torque capacity of machineWith the exportable torque capacity of auxiliary motorAnd then it solves under main motor torque capacity
Demand power PMG1With the demand power P under auxiliary motor torque capacityMG2, and solve battery requirements power Pbat, calculation formula is such as
Under:
P in formulabatFor battery requirements power, unit kW；For main motor torque, unit Nm；Turn for auxiliary motor
Square, unit Nm；ηMG1For main electric efficiency；ηMG2Supplemented by electric efficiency；ηbatFor cell discharge efficiency；
C, vehicle output torque solves
Judge battery requirements power PbatWhether battery maximum discharge power P has been reachedIt putsLimitation, if not reaching limitation,
Two motors all export corresponding torque capacity under respective revolving speedWithAnd couple engine output torque Teng, calculate total
Output torque Tall, calculation formula is as follows:
T in formulaallFor the total output torque of vehicle, unit Nm；TengFor engine output torque, unit Nm；Supplemented by
Motor output torque, unit Nm；igbFor gearbox speed ratio；For main motor output torque, unit Nm；
If battery requirements power PbatBattery maximum discharge power P is reachedIt putsLimitation, need to redistribute two motors turn
Square, if auxiliary motor is made to play torque capacityThe torque of main motor at this time can be acquiredCalculation formula is as follows:
For the minimum operation torque of main motor under present case,For the maximum functional of main motor under present case
Torque, hereMeet the condition not less than 0, even finds outLess than 0, then0 is taken, fromIt arrivesBy one
Determine the counting period and (selected according to the required precision to calculated result, generally desirable 0.1~5Nm) to change main motor torque value, then
The working range of main motor isWherein:
…
Calculating corresponding auxiliary motor torque under each counting period main motor torque isCoupling is every
Main motor torque, auxiliary motor torque and motor torque in the case of kind, calculation formula acquire all situations referring to formula (4)
Under vehicle output torque beLargest component max (the T of arrayall) vehicle theory is most i.e. under current vehicle speed
Big output torque.
The optimal torque of a kind of parallel double drive motor plug-in hybrid electric vehicle power according to the present invention as a result, needs
Analytic method is sought, by the two-dimentional torque Ergodic Matrices of main motor and auxiliary motor, the torque of reasonable distribution main motor and auxiliary motor turn
Square, so that the torque that vehicle exports under current specific operation mode is theoretical maximum output torque.Thus, the present invention sufficiently examines
The power source torque coupling condition of parallel double drive motor plug-in hybrid power system is considered, calculation method considers comprehensive, letter
It is single effective.
In addition, can also have following additional technical feature according to that above embodiment of the present invention:
According to one embodiment of present invention, in the step A when parallel operation mode, lower in speed, engine is still
Not up to idling speed when, vehicle output torque is determined simultaneously by main motor or auxiliary motor or main motor and auxiliary motor；Mode is cut
The battery SOC threshold value changed, it is related with battery characteristics, generally take fixed value；Formula (2) is in electric-only mode in the step C
Lower same establishment, at this moment only need to be motor torque TengSubstitute into 0；Main motor and auxiliary motor torque traversal method can be with
Make main motor torqueFor independent variable, auxiliary motor torqueIt, can also be with for dependent variable
Make auxiliary motor torqueFor independent variable, main motor torqueFor dependent variable, most terminate
Fruit is consistent.Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage combination following accompanying drawings of the invention will be to will become bright in the description of embodiment
It shows and is readily appreciated that, in which:
Fig. 1 is optimal according to a kind of parallel double drive motor plug-in hybrid electric vehicle power of the embodiment of the present invention
The flow chart of torque-demand analytic method；
A kind of parallel double drive motor plug-in hybrid vehicle configuration letter that Fig. 2 is applicable in by the embodiment of the present invention
Figure；
Fig. 3 is the compound external characteristics figure one of dynamical system according to each drive mode of the embodiment of the present invention；
Fig. 4 is the compound external characteristics figure two of dynamical system according to each drive mode of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar symbol indicates same or similar physical quantity or the physical quantity with same or like meaning.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings planet Series-Parallel HEV operator demand according to an embodiment of the present invention described
Torque calculation method, however, the present invention is not limited to these examples.
It is as shown in Figure 1 a kind of parallel double drive motor plug-in hybrid vehicle configuration schematic diagram, system can pass through control
Pure electric drive mode and combination drive mode in parallel are realized in the opening and closing of clutch processed；Pass through control main motor controller and auxiliary electricity
Machine controller is, it can be achieved that control to main motor and auxiliary motor revolving speed and torque.
Method as shown in Figure 2 is optimal suitable for the plug-in hybrid electric vehicle power of parallel double drive motor shown in Fig. 1
Torque-demand analytic method.This method comprises:
Step 1: drive mode being judged according to battery SOC, is divided into pure electric drive mode and mixed dynamic drive mode in parallel.Pure
Under electric drive mode, clutch is disconnected, and engine is not involved in driving, engine output torque TengIt is 0；In the mixed dynamic driving of parallel connection
Under mode, clutch is combined, and engine participates in driving, engine speed is determined by vehicle velocity V, by engine speed SengOutside interpolation
It is T that characteristic curve, which obtains engine output torque,eng。
Step 2: main motor revolving speed S is successively determined by vehicle velocity VMG1With auxiliary motor revolving speed SMG2, by main motor revolving speed and auxiliary electricity
The respective external characteristic curve of interpolation obtains the exportable torque capacity of main motor to machine revolving speed respectivelyIt is exportable with auxiliary motor
Torque capacityThe demand power P of main motor and auxiliary motor is found out according to the revolving speed and torque of main motor and auxiliary motorMG1With
PMG2。
Step 3: according to the demand power P of main motor and auxiliary motorMG1And PMG2Find out battery requirements power Pbat, judge electricity
Pond demand power PbatWhether battery maximum discharge power P is greater thanIt puts。
Step 4: if battery requirements power PbatNo more than battery maximum discharge power PIt puts, export main motor torqueIt is auxiliary
Motor torqueWith motor torque TengCoupling torque Tall；If battery requirements power PbatGreater than battery maximum electric discharge function
Rate PIt puts, need to redistribute main motor output torque and auxiliary motor output torque, so that in battery requirements power PbatNo more than electricity
Pond maximum discharge power PIt putsIn the case where, vehicle output torque is theoretical maximum output torque.
It is independent variable that one of two motor output torques, which may be selected, and another motor is dependent variable, if turned with main motor output
Square is independent variable, as shown in figure 3, (being selected according to the required precision to calculated result, generally desirable 0.1 with certain counting period
~5Nm) change torque value, obtain one group of main motor output torqueMain electricity of each counting period is acquired respectively
One group of auxiliary motor output torque value can be obtained in corresponding auxiliary motor output torque under machine output torque
One group of vehicle output torque can be acquired according to corresponding main motor torque, auxiliary motor torque and motor torqueTaking the maximum value in this group of vehicle output torque is theoretical maximum output torque.If defeated with auxiliary motor
Torque is independent variable out, as shown in figure 4, calculation method is similar with method shown in Fig. 3, final acquired results are identical as Fig. 3.
The part that do not address in the present invention uses or uses for reference prior art and can be realized.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. mean specific features described in conjunction with this embodiment or example, structure, step, method or
Person's feature is included at least one embodiment or example of the invention.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, specific features, step, method or the feature of description can be
It can be combined in any suitable manner in any one or more embodiment or examples.
Although more herein used such as array, range, SMG1、SMG2、TMG1、TMG2、PMG1、PMG2, dynamical system
Equal terms, but it does not exclude the possibility of using other terms.The use of these items is only for more easily describe to conciliate
Release essence of the invention；Being construed as any additional limitation is disagreed with spirit of that invention.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (2)
1. a kind of torque-demand analytic method that parallel connection plug-in hybrid electric vehicle power is optimal, it is characterised in that: including following
Step:
A, the identification of operating mode
Operating mode is divided into pure electrician's operation mode and two kinds of parallel operation mode, and when pure electrician's operation mode, engine is not involved in drive
It is dynamic, output torque TengIt is 0, main motor participates in driving or auxiliary motor participates in driving or main motor and auxiliary motor simultaneously participates in driving；
When parallel operation mode, engine participates in driving, output torque TengIt is obtained by engine speed interpolation external characteristic curve, simultaneously
Main motor participates in driving or auxiliary motor participates in driving or main motor and auxiliary motor simultaneously participates in driving；By judging that battery SOC is
It is no to reach pattern switching threshold value, to select operating mode；
B, battery requirements power solves
Vehicle Speed V is for calculating main motor revolving speed SMG1With auxiliary motor revolving speed SMG2, calculation formula is as follows:
SMG1=V/R × i0/0.377 (1)
SMG2=SMG1×igb (2)
S in formulaMG1For main motor speed, unit r/min；SMG2Supplemented by motor speed, unit r/min；V is speed, unit km/h；
R is vehicle wheel roll radius, unit m；i0For speed ratio of main reducer；igbFor transmission gear ratio；
Utilize main motor revolving speed SMG1With auxiliary motor revolving speed SMG2It can by main motor under interpolation external characteristic curve solution current rotating speed
The torque capacity of outputWith the exportable torque capacity of auxiliary motorAnd then solve the demand under main motor torque capacity
Power PMG1With the demand power P under auxiliary motor torque capacityMG2, and solve battery requirements power Pbat, calculation formula is as follows:
P in formulabatFor battery requirements power, unit kW；For the exportable torque capacity of main motor, unit Nm；Supplemented by
The exportable torque capacity of motor, unit Nm；ηMG1For main electric efficiency；ηMG2Supplemented by electric efficiency；ηbatFor battery discharge effect
Rate；
C, vehicle output torque solves
Judge battery requirements power PbatWhether battery maximum discharge power P has been reachedIt putsLimitation, if not reaching limitation, two electricity
Machine all exports corresponding torque capacity under respective revolving speedWithAnd couple engine output torque Teng, calculate total defeated
Torque T outall, calculation formula is as follows:
T in formulaallFor the total output torque of vehicle, unit Nm；TengFor engine output torque, unit Nm；For auxiliary motor
Exportable torque capacity, unit Nm；igbFor gearbox speed ratio；For the exportable torque capacity of main motor, unit Nm；
If battery requirements power PbatBattery maximum discharge power P is reachedIt putsLimitation, need to redistribute two motor torques, if
Auxiliary motor is set to play torque capacityThe torque of main motor at this time can be acquiredCalculation formula is as follows:
For the minimum operation torque of main motor under present case,For the maximum functional torque of main motor under present case,
HereMeet the condition not less than 0, even finds outLess than 0, then0 is taken, fromIt arrivesBy a devise a stratagem
It calculates interval (selecting according to the required precision to calculated result, generally desirable 0.1~5Nm) and changes main motor torque value, then main electricity
The working range of machine isWherein:
…
Calculating corresponding auxiliary motor torque under each counting period main motor torque isCouple every kind of feelings
Main motor torque, auxiliary motor torque and motor torque under condition, calculation formula acquire under all situations referring to formula (4)
Vehicle output torque isLargest component max (the T of arrayall) vehicle theoretical maximum is defeated i.e. under current vehicle speed
Torque out.
2. a kind of optimal torque-demand analytic method of plug-in hybrid electric vehicle power in parallel according to claim 1,
It is characterized by:
Lower in speed in the step A when parallel operation mode, when idling speed has not yet been reached in engine, vehicle output turns
Square is determined simultaneously by main motor or auxiliary motor or main motor and auxiliary motor；The battery SOC threshold value of pattern switching, with battery characteristics
It is related, generally take fixed value；Formula (2) is similarly set up under electric-only mode in the step C, at this moment only need to be engine
Torque TengSubstitute into 0；Main motor and auxiliary motor torque traversal method can make main motor torqueFor
Independent variable, auxiliary motor torqueFor dependent variable, auxiliary motor torque can also be madeFor
Independent variable, main motor torqueFor dependent variable, final result is consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910197118.0A CN109747626B (en) | 2019-03-15 | 2019-03-15 | Torque demand analysis method for optimal power of parallel plug-in hybrid electric vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111002867A (en) * | 2020-03-10 | 2020-04-14 | 李斯特技术中心（上海）有限公司 | Electric power distribution method and device of hybrid power system and hybrid power automobile |
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| DE102009022303A1 (en) * | 2009-05-22 | 2011-03-03 | Bayerische Motoren Werke Aktiengesellschaft | Method for protecting drive-relevant component of motor vehicle, involves controlling torque distribution by torque distributing device |
| CN106240336A (en) * | 2016-08-04 | 2016-12-21 | 清华大学 | A kind of plug-in bi-motor four-wheel-drive hybrid power system and control method |
| CN106828483A (en) * | 2017-03-01 | 2017-06-13 | 吉林大学 | A kind of planet Series-Parallel HEV operator demand torque calculation method |
| CN107117159A (en) * | 2017-05-12 | 2017-09-01 | 吉林大学 | A kind of CVT parallel hybrid electrics operator demand's torque estimation method |
| CN108394403A (en) * | 2018-04-28 | 2018-08-14 | 吉林大学 | A kind of power dividing type hybrid vehicle mode switch control method |
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2019
- 2019-03-15 CN CN201910197118.0A patent/CN109747626B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009022303A1 (en) * | 2009-05-22 | 2011-03-03 | Bayerische Motoren Werke Aktiengesellschaft | Method for protecting drive-relevant component of motor vehicle, involves controlling torque distribution by torque distributing device |
| CN106240336A (en) * | 2016-08-04 | 2016-12-21 | 清华大学 | A kind of plug-in bi-motor four-wheel-drive hybrid power system and control method |
| CN106828483A (en) * | 2017-03-01 | 2017-06-13 | 吉林大学 | A kind of planet Series-Parallel HEV operator demand torque calculation method |
| CN107117159A (en) * | 2017-05-12 | 2017-09-01 | 吉林大学 | A kind of CVT parallel hybrid electrics operator demand's torque estimation method |
| CN108394403A (en) * | 2018-04-28 | 2018-08-14 | 吉林大学 | A kind of power dividing type hybrid vehicle mode switch control method |
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| CN111002867A (en) * | 2020-03-10 | 2020-04-14 | 李斯特技术中心（上海）有限公司 | Electric power distribution method and device of hybrid power system and hybrid power automobile |
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