CN107117159B - A kind of CVT parallel hybrid electrics operator demand's torque estimation method - Google Patents

A kind of CVT parallel hybrid electrics operator demand's torque estimation method Download PDF

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CN107117159B
CN107117159B CN201710332175.6A CN201710332175A CN107117159B CN 107117159 B CN107117159 B CN 107117159B CN 201710332175 A CN201710332175 A CN 201710332175A CN 107117159 B CN107117159 B CN 107117159B
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speed
cvt
torque
under
dynamical system
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CN107117159A (en
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曾小华
孙可华
宋大凤
李广含
董兵兵
王新明
李立鑫
王振伟
崔皓勇
黄海瑞
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Jilin University
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Jilin University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B60W10/101—Infinitely variable gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/08—Electric propulsion units
    • B60W2510/081—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1005—Transmission ratio engaged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0666—Engine torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/08—Electric propulsion units
    • B60W2710/083—Torque
    • 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

Abstract

The invention discloses a kind of CVT parallel hybrid electrics operator demand's torque estimation method, whether this method works difference for two power sources under electrical automobile different mode in parallel mixed, the compound external characteristics of dynamical system is solved based on pattern, obtains the true maximum output characteristic of system；The characteristics of influenceing to export than stepless variation characteristic for CVT speed, by speed, ratio coverage igAsk CVT can input speed scope；Input speed limitation is obtained based on the main power source optimized rotating speed scope under different mode again；Input torque scope is obtained by the compound external characteristics of input speed interpolation after limiting；Output torque scope and system maximum output torque value are compared to obtain by speed again；Demand torque exact value is finally obtained by accelerator pedal.This method is based on pattern and solves the compound external characteristics of dynamical system and optimal operating rotational speed range, and by CVT speed than stepless Variation Features, torque range and the true maximum output characteristic of system are obtained by the range of speeds, so as to accurate potential demand torque, improve power performance and driving experience.

Description

A kind of CVT parallel hybrid electrics operator demand's torque estimation method
Technical field
The invention belongs to parallel hybrid electric technical field, more particularly to a kind of CVT parallel hybrid electrics are driven The person's of sailing demand torque estimation method.
Background technology
As energy and environment problem is increasingly serious, energy-conservation turns into the focus of government and enterprise with new-energy automobile technology. Hybrid vehicle is because its fuel economy is good, discharge is less as one of popular direction of new-energy automobile.Parallel connection therein Hybrid electric vehicle, because structure is relatively easy, is easily controlled and obtains more development and application.And with the mechanical nothings of CVT The progress of the designing and manufacturing level and control technology of level speed changer, its application on hybrid vehicle are also more and more.
In the prior art, operator demand's torque estimation patent of CVT parallel hybrid electrics is less, and other demands turn The Patents of moments estimation do not have for CVT speed than can not have the characteristics of stepless change, also in a wide range of quickly be directed to it is in parallel The optimal operating rotational speed range difference of hybrid vehicle main power source under different driving pattern is to the CVT input ranges of speeds Whether two power sources work the characteristics of larger to dynamical system maximum output capacity under limitation difference and different driving pattern, This is played for the power performance of automobile and driving experience is unfavorable.If Chinese patent publication No. is CN102897214A, date of publication For 2013-01-30, disclose a kind of analytic method of operator demand's torque, this method drives for single shaft, dynamical system by The parallel hybrid electric vehicle of engine, motor and automatic transmission composition, motor and engine test bench characteristic torque curve Carry out the compound torque array summed as dynamical system；And for example Chinese patent publication No. is CN104648404A, and date of publication is 2015-05-27, discloses a kind of analytic method of driver's driving intention, and this method is by output shaft end engine torque capacity Demand torque during with output shaft end motor maximum driving torque sum as 100% aperture of accelerator pedal；And for example Chinese patent Publication No. is CN104029675A, date of publication 2014-09-10, discloses a kind of hybrid vehicle and its dynamical system turns Square control method, (each unit status such as battery, motor, engine) all operations under current power system mode in this method The maximum driving torque that can be realized under pattern is hair as dynamical system torque capacity ability, namely dynamical system torque capacity Motivation and motor torque capacity sum；Wherein although it is contemplated that each part such as battery, motor, engine in current power system State, but do not account for engine, whether motor participates in work this important state in present mode, but all The maximum driving torque that can be realized under operational mode is as dynamical system torque capacity ability, actually still motor and hair The torque capacity summation of motivation.Therefore above-mentioned three kinds of methods are not exclusively reasonable, because motor is with starting under some patterns Machine only has a job, and system maximum output characteristic can have larger change with drive pattern difference, so two power sources are maximum Torque be directly simply added can not accurate representation automobile dynamic system real-time true maximum output characteristic.
Meanwhile above-mentioned Chinese patent publication No. be CN102897214A methods described in, using 0 to maximum speed it is complete Scope motor speed solves maximum output torque under each shelves, each input speed according to the compound torque of dynamical system.The method can not Solving the optimal operating rotational speed range difference of hybrid vehicle main power source under different driving pattern can turn to CVT inputs Fast scope limitation is different, narrower with respect to range of motor speeds as engine optimum working range during engine participation work, Poor in its low speed, high-speed region oil consumption, control strategy does not allow engine typically this regional work the problem of.
For above-mentioned technical deficiency, a kind of CVT parallel hybrid electrics operator demand's torque of the present invention Method of estimation, by for the parallel hybrid electric difference that whether two power sources work under different driving pattern, using The compound external characteristics of dynamical system based on pattern solves mode and obtains the true maximum output characteristic of dynamical system；And it is directed to CVT Speed than can in a wide range of it is rapid it is stepless change, have a direct impact feature to output characteristics, by speed, ratio coverage igSeek CVT Input can use range of speeds array Sava；The optimal operating rotational speed range S of main power source is solved based on present mode againlim, it is right Input obtains available optimized rotating speed scope S under current vehicle speed after being limited with rotating speedopt；It is compound by each rotating speed interpolation again External characteristics obtains input torque range Tin；Speed compares to obtain output end torque range T as corresponding to each rotating speed againout；Again to each fast ratio Under torque maximizing obtain system maximum output torque；The exact value of real-time requirement torque is finally obtained by accelerator pedal.We Method is based on drive pattern and solves the compound external characteristics of dynamical system, and according to CVT speed than can be under stepless Variation Features and different mode Optimized rotating speed difference, torque range is obtained by the range of speeds, finally ask and be most worth to the true maximum output characteristic of system, can be accurate Estimate driver's real-time requirement torque, and then improve automobile dynamic quality and driving experience.
The content of the invention
To solve the shortcomings of the prior art, the invention provides a kind of CVT parallel hybrid electrics driver to need Torque estimation method is sought, that takes into account the difference that whether two power sources work under different driving pattern, using based on pattern The compound external characteristics of dynamical system solves mode and obtains the true maximum output characteristic of dynamical system；And considering the fast ratios of CVT can In a wide range of interior rapid stepless change, have a direct impact feature to output characteristics, pass through speed, ratio coverage solves CVT inputs End can use range of speeds array Sava；Also contemplate the optimal operating rotational speed range S of main power source under different mode simultaneouslyoptDifference It is different, obtain the input optimized rotating speed scope S under present modeopt；It is and then more defeated corresponding to external characteristics than obtaining by interpolation and speed Enter, output torque, so as to current real maximum exportable turn by asking maximum to obtain system torque value of each speed than under Square, demand torque is finally obtained by pedal.Thus this method taken into full account CVT parallel hybrid electrics design feature and Power source participates in working condition difference to system maximum output ability and input speed scope to optimal work under each drive pattern The influence that rotating speed section has limited, while characteristic of the CVT speed than electrodeless change is considered, so as to accurately obtain system True maximum output characteristic, and then the precise results of operator demand's torque can be obtained.
To achieve the above object, a kind of CVT parallel hybrid electrics operator demand according to embodiments of the present invention turns Moment estimation method, comprise the following steps：
Step 1, the characteristics of being respectively positioned on CVT inputs according to motor, the engine in parallel for mixing power vehicle, difference is driven The situation that whether each power source participates in driving under dynamic model formula can be different；First according to two power source external characteristics, using based on The compound external characteristics method for solving of dynamical system of drive pattern, obtain the dynamical system maximum under each input speed can input turn Square；
Step 2, for CVT speed than can stepless change real-time the characteristics of, as shown in formula (1), by actual vehicle speed v According to CVT ratio coverage array ig(ratio coverage array interval takes a certain smaller than changing sensitivity not less than CVT speed Value, the available range of speeds S as 0.1) solved CVT inputs under current vehicle speedava, you can obtain and real-time speed and any fast ratio is_avaCorresponding every speed Sava；Namely according to current vehicle speed value v can obtain it is fast than and two arrays of rotating speed, and fast ratio with Tachometer value corresponds；
In formula, n is CVT input rotating speeds, unit rpm；i0For speed ratio of main reducer；R is radius of wheel, unit m；
Step 3, scope difference is limited according to the higher optimal working speed of major impetus source efficiency under different driving pattern The characteristics of, the optimal operating rotational speed range of main power source based on current drive pattern obtains CVT inputs rotating speed limitation scope Slim；Again by the available range of speeds S of CVT inputs under current vehicle speedava, the two common factor is sought, obtains currently available CVT inputs Hold optimal operating rotational speed range Sopt, correspondingly fast ratio is designated as i to each rotating speeds_opt；
Step 4, by the optimal operating rotational speed range S of CVT inputsoptMoved under the interior current drive pattern of every speed interpolation The compound external characteristics T-S curves of Force system, obtain CVT input torque scopes Tin；In conjunction with every speed SoptThe corresponding speed of value Compare is_opt, obtain the exportable torque range T of CVTout；
Step 5, to the exportable torque range T of CVT under real-time speed, patternoutInterior each torque value seeks MAX, is worked as Under preceding vehicle condition (speed, drive pattern), the exportable torque T of true maximum of dynamical systemmax；
Step 6, by the maximum exportable torque T of dynamical system under current vehicle conditionmaxTry to achieve and drive with accelerator pedal signal k The pre- demand torque T ' of the person of sailingreq；
Step 7, to avoid gained operator demand torque from larger rapid fluctuation occur, to pre- demand torque value T 'req's Rate of change is limited, and obtains driver's real-time requirement torque Treq, prevent the rapid change because of demand torque from causing pattern switching Frequently or vehicle impact is spent greatly.
Thus, according to a kind of CVT parallel hybrid electrics operator demand's torque estimation method of the present invention, base is passed through The true maximum output characteristic of dynamical system is obtained in the compound external characteristics method for solving of the dynamical system of pattern, and passes through each speed CVT inputs than under can be calculated with rotating speed, the main power source optimized rotating speed scope limitation under different mode, and obtaining CVT can The system maximum output torque characteristic of realization, finally gives accurate demand torque.Thus, the method for the invention specifically for Mixed dynamic and CVT the work characteristics of parallel connection, can accomplish careful comprehensive, accurate and effective.
In addition, following additional technical feature can also be had according to the above embodiment of the present invention：
According to one embodiment of present invention, the compound external characteristics T-S of dynamical system in the step 1 based on drive pattern The method for solving of curve is to drive situation according to the participation of power source under current drive pattern, determine the compound outer spy of dynamical system The part of property；I.e. the compound external characteristics of dynamical system only includes participating in driving under present mode, has driving force defeated to driving wheel The maximum output characteristic of the power source gone out.
According to one embodiment of present invention, the CVT ratio coverage arrays i in the step 2gRefer to achieved by CVT All gearratios excursion, be the preset parameter that CVT mechanical structures are determined；In the corresponding step 3 CVT inputs rotating speed limitation scope SlimRefer under current drive pattern, the main power source defined in automobile control strategy Optimal operating rotational speed range；Such as S under electric-only modelimIt is (or specified turn of the optimal working speed of the desired motor of control strategy It is fast following) scope, there is S under other drive patterns of engine participationlimFor the desired engine optimum working speed of control strategy Scope；And the optimal operating rotational speed range of motor, engine is according to its efficiency/oil consumption MAP data scalings, to improve dynamical system System economy；Simultaneously according to real-time bus state and each fast ratio i in step 2~4g, gained can use the range of speeds Sava, the optimal operating rotational speed range S of inputopt, input torque scope Tin, output torque scope ToutIt is array form, and Each speed/torque value respectively with each fast ratio is_ava、is_optCorrespond, it is defeated thus its can be obtained according to CVT input characteristics Go out characteristic, and then finally give the accurate demand of driver.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage combination accompanying drawings below of the present invention will be to that will become bright in the description of embodiment Show and be readily appreciated that, wherein：
Fig. 1 is a kind of CVT parallel hybrid electrics operator demand's torque estimation method according to the embodiment of the present invention Flow chart；
Fig. 2 is the compound external characteristics method for solving flow chart of the dynamical system based on pattern according to the embodiment of the present invention；
Fig. 3 is the consideration CVT speed according to the embodiment of the present invention than main power source under stepless variation characteristic and different mode The dynamical system torque output capability method for solving flow chart of optimal operating rotational speed range limitation；
A kind of parallel hybrid electric configuration sketch that Fig. 4 is applicable by one embodiment of the invention；
A kind of parallel hybrid electric configuration sketch that Fig. 5 is applicable by another embodiment of the present invention；
In figure：1st, step 1；2nd, step 2；3rd, step 3；4th, step 4；5th, step 5；6th, step 6；
7th, step 7；
Ith, engine；IIth, clutch；IIIth, motor；Ⅳ、CVT；Vth, power coupler.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar symbol represents same or similar physical quantity or the physical quantity with same or like meaning.Below by ginseng The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " array ", " model Enclose " it should be interpreted broadly, for example, it may be the random number of one group of equally spaced number or interval, for the general of this area For logical technical staff, the concrete meaning of above-mentioned term can be understood as the case may be.
Noted by the basic structure of parallel hybrid electric and CVT by those skilled in the art, therefore herein No longer repeat one by one, two kinds of typical configuration sketches are only provided in accompanying drawing 3, Fig. 4.
Below with reference to the accompanying drawings a kind of CVT parallel hybrid electrics operator demand according to embodiments of the present invention described Torque estimation method, but the present invention is not limited to these embodiments.
Method as shown in Figure 1, for the estimation side suitable for the hybrid vehicle demand torque of single shaft parallel architecture shown in Fig. 4 Method.This method includes：
Step 1：The current drive pattern of automobile and engine, motor external characteristics data are obtained, if current drive pattern Only have a power source down and be driven work, then the compound external characteristics of dynamical system is equal to this power source external characteristics；It is if current Two power sources are driven work under drive pattern, then the compound external characteristics of dynamical system be equal to two power source external characteristics it With.
If its method detailed is as shown in Fig. 2 be currently pure electronic EV patterns, only motor is driven work, then power The compound external characteristics of system is equal to motor external characteristics torque；It is if current to drive and generate electricity CHEV patterns or engine individually drives Dynamic ICE patterns, only engine are driven work, then the compound external characteristics of dynamical system is equal to engine test bench characteristic torque；If Current to be driven work for joint driving BHEV patterns, two power sources, then the compound external characteristics of dynamical system, which is equal to, starts Machine external characteristics and motor external characteristics torque sum；If there is other drive patterns, vehicle traction is both participated according to power source Situation calculates compound external characteristics.
Step 2：CVT speed than by a certain interval, (interval takes sensitiveer than changing not less than CVT speed from minimum value to maximum The a certain smaller value of degree, such as 0.1) it is divided into an array ig.Then, CVT inputs are tried to achieve by actual vehicle speed and each fast ratio Available range of speeds array Sava.Then under arbitrary current vehicle speed, to any available rotating speed SavaValue has a fast ratio is_avaCorrespond.
Step 3：By the optimal operating rotational speed range of the main power source defined in control strategy under current drive pattern Slim, to the available range of speeds S of CVT inputs under current vehicle speedavaLimited, that is, seek the common range (common factor) of the two, Obtain the optimal operating rotational speed range S of inputopt, fast ratio corresponding with its each tachometer value is designated as is_opt。
Step 4：By the optimal operating rotational speed range S of CVT inputsoptThe interior every speed difference current drive pattern of interpolation The lower compound external characteristics T-S curves of dynamical system, obtain CVT input torque scopes Tin；In conjunction with every speed value SoptIt is corresponding Speed compare is_optObtain the exportable torque range T of CVTout。
Step 5：The exportable torque range T of CVT under real-time speed, drive patternoutIt it is one with number of the speed than change Group, each torque value in array by asking MAX to obtain maximum, under as current vehicle condition (speed, drive pattern), power The maximum exportable torque T of systemmax。
Step 6：By the maximum exportable torque T of dynamical system under current vehicle conditionmaxIt is multiplied, asks with accelerator pedal signal k Obtain the pre- demand torque T ' of driverreq。
Step 7：To pre- demand torque value T 'reqRate of change limited, obtain driver's real-time requirement torque Treq's Exact value.
For the method for estimation of the twin shaft parallel architecture hybrid vehicle demand torque shown in Fig. 5, with configuration shown in Fig. 4 Method is similar, only there is part variation in step 1：Obtaining the current drive pattern of automobile and engine, motor external characteristics After data, if only electric motor operation under current drive pattern, the compound external characteristics of dynamical system be equal to motor external characteristics with Result after coupling device gearratio phase separation (range of speeds reduces, torque range expands)；If only sent out under current drive pattern Motivation is driven work, then the compound external characteristics of dynamical system is equal to engine test bench characteristic；If two is dynamic under current drive pattern Power source is driven work, then the compound external characteristics of dynamical system is equal to engine test bench characteristic and motor external characteristics with coupling Result sum after device gearratio phase separation.
Enter action edge coupling after CVT with engine for other single, double axle parallel hybrid power configurations, such as motor The situation of conjunction, the influence for considering fast ratio using similar above-mentioned method can be achieved.
To sum up, the true maximum that dynamical system is obtained by the compound external characteristics method for solving of dynamical system based on pattern is defeated Go out characteristic, and rotating speed S can be used than lower CVT inputs by each speedavaCalculating, the optimal work of main power source under different mode Make range of speeds SlimLimitation, obtain the optimal operating rotational speed range S of CVT inputsopt, and then interpolation is obtained corresponding to external characteristics Input, output end torque and the achievable maximum output torque T of systemmax, the final exact value that can obtain demand torque.
The part do not addressed in the present invention uses or used for reference prior art and can be achieved.
In the description of this specification, reference term " one embodiment ", " another embodiment ", " single shaft in parallel " or The description of " twin shaft is in parallel " etc. means to combine specific features, structure, step, method or the feature that the embodiment or example describe It is contained at least one embodiment or example of the present invention.In this manual, the schematic representation of above-mentioned term is differed Surely identical embodiment or example are referred to.Moreover, specific features, step, method or the feature of description can be any Combined in an appropriate manner in one or more embodiments or example.
Although herein it is more used such as " array ", " scope ", " single shaft is in parallel ", " twin shaft is in parallel ", " CVT ", Terms such as " dynamical systems ", but it is not precluded from the possibility using other terms.Using these terms just for the sake of more convenient Ground describes and explains the essence of the present invention；Being construed as any additional limitation is disagreed with spirit of the present invention 's.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not In the case of departing from the principle and objective of the present invention a variety of change, modification, replacement and modification can be carried out to these embodiments, this The scope of invention is limited by claim and its equivalent.

Claims (3)

  1. A kind of 1. CVT parallel hybrid electrics operator demand's torque estimation method, it is characterised in that：Comprise the following steps：
    Step 1, the characteristics of CVT inputs being respectively positioned on according to motor, the engine in parallel for mixing power vehicle, different driving mould The situation that whether each power source participates in driving under formula can be different；First according to two power source external characteristics, using based on driving The compound external characteristics method for solving of dynamical system of pattern, the dynamical system maximum obtained under each input speed can input torque；
    Step 2, for CVT speed than can stepless change real-time the characteristics of, determine that CVT speed compares igArray of coverage, between array Chosen every according to computational accuracy demand, then as shown in formula (1), i is compared according to CVT speed by actual vehicle speed vgArray of coverage is asked Solve the available rotating speed S of CVT inputs under current vehicle speedavaScope, you can obtain and compare i with real-time speed and any speeds_avaCorresponding Every speed Sava；Namely according to current vehicle speed value v can obtain it is fast than and two arrays of rotating speed, and a pair of fast ratio and tachometer value 1 Should；
    <mrow> <mi>n</mi> <mo>=</mo> <mfrac> <mrow> <mi>v</mi> <mo>&amp;CenterDot;</mo> <msub> <mi>i</mi> <mn>0</mn> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>i</mi> <mi>g</mi> </msub> </mrow> <mrow> <mn>0.377</mn> <mi>r</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    In formula, n is CVT input rotating speeds, unit rpm；i0For speed ratio of main reducer；R is radius of wheel, unit m；
    Step 3, the different spy of scope is limited according to the higher optimal working speed of major impetus source efficiency under different driving pattern Point, the optimal operating rotational speed range of main power source based on current drive pattern obtain CVT inputs rotating speed limitation scope Slim； Again by the available rotating speed S of CVT inputs under current vehicle speedavaScope, the two common factor is sought, obtain currently available CVT inputs most Excellent working speed SoptScope, the corresponding fast ratio of each rotating speed are designated as is_opt；
    Step 4, by the optimal working speed S of CVT inputsoptIn the range of the current drive pattern of every speed interpolation under dynamical system Unite compound external characteristics T-S curves, obtain CVT input torque scopes Tin；In conjunction with every speed SoptThe corresponding fast ratio of value is_opt, obtain the exportable torque range T of CVTout；
    Step 5, to the exportable torque range T of CVT under real-time speed, patternoutInterior each torque value seeks MAX, obtains current vapour Under the speed and drive pattern state of car, the exportable torque T of true maximum of dynamical systemmax；
    Step 6, by the maximum exportable torque T of dynamical system under current vehicle conditionmaxDriver is tried to achieve with accelerator pedal signal k Pre- demand torque Tr'eq；
    Step 7, to avoid gained operator demand torque from larger rapid fluctuation occur, to pre- demand torque value Tr'eqChange Rate is limited, and obtains driver's real-time requirement torque Treq, prevent the rapid change because of demand torque from causing pattern switching frequent Or vehicle impact is spent greatly.
  2. 2. a kind of CVT parallel hybrid electrics operator demand's torque estimation method according to claim 1, its feature It is：The method for solving of the compound external characteristics T-S curves of dynamical system in the step 1 based on drive pattern is, according to current The participation driving situation of power source under drive pattern, determine the part of the compound external characteristics of dynamical system；I.e. dynamical system is answered Closing external characteristics only includes participating in driving, the maximum output characteristic for the power source for having driving wheel driving force to export under present mode.
  3. 3. a kind of CVT parallel hybrid electrics operator demand's torque estimation method according to claim 1, its feature It is：CVT speed in the step 2 compares igArray of coverage refers to the excursion of all gearratios achieved by CVT, is The preset parameter that CVT mechanical structures are determined；CVT inputs rotating speed limitation scope S in the corresponding step 3limIt is Refer under current drive pattern, the optimal operating rotational speed range of the main power source defined in automobile control strategy；Pure electronic S under patternlimIt is the scope below the optimal working speed of the desired motor of control strategy or rated speed, there is engine participation Other drive patterns under SlimFor the desired engine optimum operating rotational speed range of control strategy；And motor, engine are most Excellent operating rotational speed range is according to its efficiency/oil consumption MAP data scalings, to improve dynamical system economy；While the step 2~ According to real-time bus state and each fast ratio i in 4g, gained can use rotating speed SavaThe optimal working speed S of scope, inputoptModel Enclose, input torque scope Tin, output torque scope ToutBe array form, and each speed/torque value respectively with each fast ratio is_ava、is_optCorrespond, thus its output characteristics can be obtained according to CVT input characteristics, and then finally give driver's Accurate demand.
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