A kind of the power follow-up control method and system of range-extended electric automobileTechnical field
The present invention relates to automobile manufacturing field more particularly to a kind of power follow-up control methods of range-extended electric automobileAnd system.
Background technique
Energy crisis and environmental pollution are two big crises of the world today, greatly develop new-energy automobile and have become solution two greatlyThe only way of crisis, new-energy automobile have the types such as pure electric automobile, hybrid vehicle and fuel cell car, wherein" zero-emission " truly may be implemented in pure electric automobile, but its with power battery energy density the bases such as low, charging pileThe congenital disadvantages such as Infrastructure is not perfect, the charging time is long make its development by a degree of restriction.Stroke-increasing electric automobileIt (E-REV) is on the basis of pure electric automobile as one kind from hybrid vehicle to the ideal interim form of pure electric automobileThe upper a set of auxiliary power unit of installation --- distance increasing unit (APU, Auxiliary Power Unit) can reduce vehicle to powerThe degree of dependence of battery durable mileage improves the course continuation mileage of vehicle.
The control strategy of stroke-increasing electric automobile not only will affect vehicle fuel consumption and emission performance, also to power electricThere is larger impact in the service life in pond.Stroke-increasing electric automobile mainstream control strategy mainly has either simplex condition dot pattern, multi-state point at presentMode and Power following.Practical application it is more be Power following, under the mode, as shown in Figure 1, power electricPond remaining capacity and power are all to be provided only with two threshold values, when power battery remaining capacity is lower than its lower limit threshold values or demand functionWhen rate limits greatly threshold values thereon, distance increasing unit is opened, when power battery remaining capacity is higher than its upper limit threshold values and demand power is lower thanWhen its lower limit threshold values, distance increasing unit is closed, state before other situations are then kept；When distance increasing unit starts, engine will follow vehiclePower demand and constantly convert operating condition, engine fuel consumption and discharge are unable to reach optimal, and engine frequently opensIt is dynamic that certain interference can be generated to driver, it is unfavorable for the promotion of driving experience.
Summary of the invention
The purpose of the present invention is to provide the power follow-up control methods and system of a kind of range-extended electric automobile, solveUnder conventional power follow the mode engine fuel consumption and discharge are unable to reach optimal, and engine frequent starting is askedTopic.
To achieve the goals above, the invention provides the following technical scheme:
A kind of power follow-up control method of range-extended electric automobile, comprising steps of
The current residual electric quantity SOC of S1, acquisition power battery, calculates vehicle power demand Pdemand；
S2, according to the residual electric quantity value SOC and vehicle power demand Pdemand, judge that distance increasing unit opens or closes；
S3, when the distance increasing unit working condition be open when, further judge the generated output P of the distance increasing unitAPU, andThe distance increasing unit is controlled according to the generated output PAPUWork.
Specifically, the method that the step S2 judges that distance increasing unit opens or closes specifically includes:
S201, the first power demand threshold value P is determined according to power battery 3C discharge power limithigh；
S202, default remaining capacity lower limit value SOCminWith remaining capacity upper limit value SOCmax；
S203, as SOC < SOCminAnd/or Pdemand> PhighWhen, the distance increasing unit is opened；
As SOC >=SOCmaxAnd Pdemand≤PhighWhen, the distance increasing unit is closed；
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PhighWhen, unlatching/closed state of the distance increasing unit is kept notBecome.
Preferably, distance increasing unit working condition described in step S3 is the judgement of the generated output of distance increasing unit when openingMethod specifically includes:
S301, the second power demand threshold value P is calculated by the high efficiency range of the distance increasing unitmax；
S302, third power demand threshold value P is determined according to power battery 0.3C discharge power limitmin；
S303, work as Pdemand> PhighWhen, the generated output of the distance increasing unit follows vehicle power demand, remains PAPU=Pdemand；
As SOC < SOCminAnd Pmax< Pdemand≤PhighWhen, the distance increasing unit invariable power power generation, and PAPU=Phigh；
As SOC < SOCminAnd Pmin< Pdemand≤PmaxWhen, the generated output of the distance increasing unit follows vehicle power to needIt asks, remains PAPU=Pdemand；
As SOC < SOCminAnd Pdemand≤PminWhen, the distance increasing unit invariable power power generation, and PAPU=Pmin。
S304, the engine emission in conjunction with distance increasing unit, engine efficiency, the generator efficiency of engine NVH and distance increasing unit,The work of distance increasing unit described in generator NVH real-time control is meeting the generated output PAPURunning operating point；Wherein, the fortuneThe parameter of row operating point includes power generation revolving speed and power generation torque.
Further, work as SOCmin≤ SOC < SOCmax、Pdemand≤PhighAnd distance increasing unit previous moment is open stateWhen, the distance increasing unit is kept it turning on, and the judgment method of the distance increasing unit generated output specifically includes at this time:
Work as SOCmin≤ SOC < SOCmaxAnd Pmax< Pdemand≤PhighWhen, the distance increasing unit invariable power power generation, andPAPU=Pmax；
Work as SOCmin≤ SOC < SOCmaxAnd Pmin< Pdemand≤PmaxWhen, the generated output of the distance increasing unit follows vehiclePower demand remains PAPU=Pdemand；
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PminWhen, the distance increasing unit invariable power power generation, and PAPU=Pmin。
A kind of power following control system of range-extended electric automobile, using the power of above-mentioned range-extended electric automobileFollow-up control method, the power following control system of the range-extended electric automobile include distance increasing unit interconnected, powerBattery, controller and driving motor, the controller include acquisition module, first judgment module and the second judgment module,In,
The input terminal of the acquisition module connects the power battery and the driving motor, output end connection described firstJudgment module, the output end of the first judgment module connect the input terminal of the power battery and the third judgment module,The output end of the third judgment module connects the distance increasing unit；
The acquisition module calculates vehicle power demand for acquiring the current residual electric quantity SOC of power batteryPdemand；
The first judgment module is for value SOC and vehicle power demand P according to the residual electric quantitydemand, judgement is simultaneouslyThe distance increasing unit is controlled to open or close；It is also used to control the power electric when the working condition of the distance increasing unit is closesPond is driving motor power supply；
Second judgment module is used to further judge the distance increasing unit when the distance increasing unit working condition is to openGenerated output PAPUAnd it controls the distance increasing unit and opens work.
Preferably, the first judgment module includes the first storage unit and the first judging unit, and first judgement is singleThe input terminal of member is separately connected first storage unit and acquisition module, and output end is separately connected the power battery and describedSecond judgment module；
First storage unit is for being pre-stored the first power demand threshold value Phigh, remaining capacity lower limit value SOCminWithRemaining capacity upper limit value SOCmax, wherein the first power demand threshold value PhighIt is true according to power battery 3C discharge power limitIt is fixed；
First judging unit is used for according to residual electric quantity SOC and vehicle power demand PdemandJudge the increasing journeyDevice opens or closes:
As SOC < SOCminAnd/or Pdemand> PhighWhen, the distance increasing unit is opened；
As SOC >=SOCmaxAnd Pdemand≤PhighWhen, the distance increasing unit is closed；
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PhighWhen, the working condition of the distance increasing unit remains unchanged.
Preferably, second judgment module includes the second storage unit and second judgment unit, second judgement is singleThe input terminal of member is separately connected second storage unit and first judging unit, the output end of the second judgment unitConnect the distance increasing unit；
Second storage unit is for storing the second power demand threshold value PmaxWith third power demand threshold value Pmin,In, the second power demand threshold value PmaxIt is determined by the high efficiency range of the distance increasing unit, the third power demand threshold valuePminIt is determined according to power battery 0.3C discharge power limit；
The second judgment unit is used to judge the generated output of the distance increasing unit, and controls the distance increasing unit power generation:
Work as Pdemand> PhighWhen, the generated output of the distance increasing unit follows vehicle power demand, remains PAPU=Pdemand, the distance increasing unit power generation is for supplying the driving motor；
As SOC < SOCminAnd Pmax< Pdemand≤PhighWhen, the distance increasing unit invariable power power generation, and PAPU=Phigh,The distance increasing unit power generation is driving motor power supply and is the power battery charging；
As SOC < SOCminAnd Pmin< Pdemand≤PmaxWhen, the generated output of the distance increasing unit follows vehicle power to needIt asks, remains PAPU=Pdemand, the distance increasing unit power generation is for supplying the driving motor；
As SOC < SOCminAnd Pdemand≤PminWhen, the distance increasing unit invariable power power generation, and PAPU=Pmin, the increasingThe power generation of journey device is driving motor power supply and is the power battery charging.
Further, the second judgment unit is also used to work as SOCmin≤ SOC < SOCmax、Pdemand≤PhighAnd increaseWhen journey device previous moment is open state, the generated output of the distance increasing unit is judged:
Work as SOCmin≤ SOC < SOCmaxAnd Pmax< Pdemand≤PhighWhen, the distance increasing unit invariable power power generation, andPAPU=Pmax；
Work as SOCmin≤ SOC < SOCmaxAnd Pmin< Pdemand≤PmaxWhen, the generated output of the distance increasing unit follows vehiclePower demand remains PAPU=Pdemand；
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PminWhen, the distance increasing unit invariable power power generation, and PAPU=Pmin。
Specifically, the distance increasing unit includes the generator and engine interconnected, and the second judgment unit further includesCondition controller, the condition controller are connect with the generator and the engine signal respectively；The condition controllerFor the work of the distance increasing unit in conjunction with described in the engine emission, efficiency, NVH and the generator efficiency, NVH real-time control fullThe foot generated output PAPURunning operating point, wherein the parameter of the running operating point include power generation revolving speed and power generation turn roundSquare.
Preferably, the system also includes power converter, the power converter is separately connected the power battery, instituteDriving motor and the generator are stated, the electric energy that the power converter is used to generate in the generator carries out alternating current-direct current and turnsChange be conveyed to the driving motor and/or the power battery, by the electrical energy transportation of the power battery to the driving motor,And the control driving motor work.
Compared with prior art, a kind of power follow-up control method of range-extended electric automobile provided by the invention and it isSystem has the advantages that
A kind of power follow-up control method of range-extended electric automobile provided by the invention, it is surplus according to power battery firstRemaining charge value SOC and vehicle power demand Pdemand, judge that distance increasing unit opens or closes, distance increasing unit optimized in deterministic processThe window for determining starting, avoids type range extender engine frequent starting, improves driving experience；When distance increasing unit is closed by power electricPond is that driving motor power supply further judges the generated output P of distance increasing unit when distance increasing unit is openedAPU, and control distance increasing unit workMake in generated output PAPUUnder, finally meeting hair in conjunction with the work of the Properties Control distance increasing unit of the engine of distance increasing unit and generatorElectrical power PAPUOptimized operation operating point, when the generated output of distance increasing unit follows vehicle power demand, distance increasing unit power generation meetDriving motor effectively prevent power battery high power discharge, is conducive to improve power battery service life；When distance increasing unit invariable powerPower generation in optimal operating condition point, be driving motor power and be power battery charging, reduce vehicle energy consumption and optimize hairMotivation discharge.
It is pure using above-mentioned extended-range the invention also discloses a kind of power following control system of range-extended electric automobileThe power follow-up control method of electric car, solving engine fuel consumption and discharge under conventional power follow the mode can not reachTo optimal, and the problem of engine frequent starting.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hairBright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is conventional power model- following control strategy schematic diagram；
Fig. 2 is a kind of power follow-up control method schematic diagram of range-extended electric automobile in the embodiment of the present invention；
Fig. 3 is to judge the method schematic diagram that distance increasing unit opens or closes in the embodiment of the present invention；
Fig. 4 is a kind of power following control system structural schematic diagram of range-extended electric automobile in the embodiment of the present invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, implement below in conjunction with the present inventionAttached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodimentOnly a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this fieldArt personnel all other embodiment obtained without creative labor belongs to the model that the present invention protectsIt encloses.
Embodiment one
Please refer to Fig. 2 or Fig. 3, a kind of power follow-up control method of range-extended electric automobile provided in this embodiment,Comprising steps of
The current residual electric quantity SOC of S1, acquisition power battery, calculates vehicle power demand Pdemand；Acquire power batteryThe method of current residual electric quantity SOC include current integration method, the method for estimating remaining capacity based on equivalent-circuit model orPerson's extended Kalman filter and its improved method etc.；Calculate vehicle power demand PdemandMethod include by acceleration indexThe methods of direct solution.
S2, according to residual electric quantity SOC and vehicle power demand Pdemand, judge that distance increasing unit opens or closes；It please refers toFig. 3 optimizes the window that distance increasing unit determines starting in deterministic process, avoids type range extender engine frequent starting, improve drivingExperience.
S3, when distance increasing unit close when by power battery be driving motor power, when distance increasing unit working condition be unlatching when, intoOne step judges the generated output P of distance increasing unitAPU, and distance increasing unit is controlled according to generated output PAPUWork；In the power generation function of distance increasing unitWhen rate follows vehicle power demand, distance increasing unit power generation meets driving motor, effectively prevent power battery high power discharge, is conducive toImprove power battery service life；When distance increasing unit invariable power power generation in optimal operating condition point, for driving motor power and beThe charging of power battery, reduces vehicle energy consumption and optimizes engine emission.
Specifically, referring to Fig. 3, the method that step S2 judges that distance increasing unit opens or closes specifically includes:
S201, the first power demand threshold value P is determined according to power battery 3C discharge power limithigh；
S202, default remaining capacity lower limit value SOCminWith remaining capacity upper limit value SOCmax；
S203, as SOC < SOCminAnd/or Pdemand> PhighWhen, distance increasing unit is opened, power battery over-discharge is avoided,Extend the service life of power battery；
As SOC >=SOCmaxAnd Pdemand≤PhighWhen, distance increasing unit is closed, and power battery can satisfy vehicle completely at this timePower demand, close distance increasing unit reduce energy loss；
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PhighWhen, the working condition of distance increasing unit remains unchanged, and avoids increasingJourney device engine frequent starting, improves driving experience.
Further, distance increasing unit working condition is the judgment method tool of the generated output of distance increasing unit when opening in step S3Body includes:
S301, the second power demand threshold value P is calculated by the high efficiency range of distance increasing unitmax, that is, pass through starting for distance increasing unitThe calculating such as the discharge of machine fuel efficiency, generator efficiency calculate the second power demand threshold value Pmax, specifically, PmaxPerformance number be betweenPminAnd PhighBetween, according to engineering experience, comprehensive an oil consumption, generator efficiency, the optimum condition of NVH is had in the sectionPoint, optimal working point can be obtained by Matlab multiple-objection optimization module, finally by the power where the optimal working pointDetermine Pmax。
S302, third power demand threshold value P is determined according to power battery 0.3C discharge power limitmin；
S303, work as Pdemand> PhighWhen, the generated output of distance increasing unit follows vehicle power demand, remains PAPU=Pdemand, distance increasing unit is produced electricl energy to work for driving motor, avoids power battery high power discharge, is conducive to improve power electricPond service life.
As SOC < SOCminAnd Pmax< Pdemand≤PhighWhen, the power generation of distance increasing unit invariable power, and PAPU=Phigh, increase journeyDevice is with invariable power PhighPower generation is conducive to optimize engine emission and oil consumption, distance increasing unit produces electricl energy one in optimal operating condition pointDivide and work for driving motor, another part is power battery charging, not only ensure that the normal work of driving motor, but also be low electricityThe power battery charging of amount is conducive to improve power battery service life.
As SOC < SOCminAnd Pmin< Pdemand≤PmaxWhen, the generated output of distance increasing unit follows vehicle power demand, beginsP is kept eventuallyAPU=Pdemand, distance increasing unit is produced electricl energy to work for driving motor, reduces power battery electric discharge, is conducive to improve dynamicPower battery.
As SOC < SOCminAnd Pdemand≤PminWhen, the power generation of distance increasing unit invariable power, and PAPU=Pmin, distance increasing unit is with perseverancePower PminPower generation is conducive to optimize engine emission and oil consumption, distance increasing unit produces electricl energy a part for driving in optimal operating condition pointDynamic motor work, another part is power battery charging, not only ensure that the normal work of driving motor, but also is the power of low batteryBattery charging is conducive to improve power battery service life.
S304, the engine emission in conjunction with distance increasing unit, engine efficiency, the generator efficiency of engine NVH and distance increasing unit,The work of generator NVH real-time control distance increasing unit is meeting generated output PAPUOptimized operation operating point；Wherein, running operating pointParameter include power generation revolving speed and power generation torque, distance increasing unit work is conducive to optimize engine in distance increasing unit in optimal operating condition pointDischarge and fuel oil.
Wherein, with PminAnd PmaxBetween carry out power model- following control when for, illustrate the calculation method of optimal operating condition point:PminAnd PmaxBetween carry out power model- following control, actual operating mode is PminAnd PmaxBetween optimum condition line.Calculation methodIt can be, PminAnd PmaxBetween be divided into several invariable power curves, then again on each invariable power line by multiple target it is excellentThe method (oil consumption, efficiency, NVH) of change determines the optimal operating condition point on each invariable power curve, then by all optimum operating conditionsPoint is fitted to optimum operating condition line, which can be stored in by calibration in special memory and by special controllerObtain and be sent to distance increasing unit in real time, also can use special controller and be calculated and be sent to distance increasing unit in real time, power withImmediately according to PAPU=PdemandIn the suitable optimal operating condition point operation of optimum operating condition line options.
In conventional measures shown in FIG. 1, when the small Mr. Yu of vehicle demand power is worth, distance increasing unit will be closed, and often will appear increasingThe case where journey device frequent start-stop.A kind of power follow-up control method of range-extended electric automobile provided in an embodiment of the present inventionIn, when the small Mr. Yu's value of vehicle demand power, distance increasing unit generates electricity invariable power, supplies vehicle driving motor and air-conditioning, PTC, soundOther power attachmentes such as acoustic system use, while giving power battery charging, avoid distance increasing unit frequent start-stop, and it is pure to improve extended-rangeElectric vehicle driving experience.
Please continue to refer to Fig. 3, a kind of power model- following control side of range-extended electric automobile provided in an embodiment of the present inventionIn method, work as SOCmin≤ SOC < SOCmax、Pdemand≤PhighAnd when distance increasing unit previous moment is open state, the distance increasing unitIt keeps it turning on, the judgment method of the distance increasing unit generated output specifically includes at this time:
Work as SOCmin≤ SOC < SOCmaxAnd Pmax< Pdemand≤PhighWhen, the distance increasing unit invariable power power generation, andPAPU=Pmax, distance increasing unit is with invariable power PmaxPower generation is conducive to optimize engine emission and oil consumption, distance increasing unit in optimal operating condition pointIt produces electricl energy and works for driving motor, insufficient part is discharged polishing by power battery, ensure that the normal work of driving motorMake, and power battery over-discharge is prevented to be conducive to improve power battery service life.
Work as SOCmin≤ SOC < SOCmaxAnd Pmin< Pdemand≤PmaxWhen, the generated output of the distance increasing unit follows vehiclePower demand remains PAPU=Pdemand, distance increasing unit is produced electricl energy to work for driving motor, power battery electric discharge is reduced,Be conducive to improve power battery service life.
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PminWhen, the distance increasing unit invariable power power generation, and PAPU=Pmin, distance increasing unit is with invariable power PminPower generation is conducive to optimize engine emission and oil consumption, distance increasing unit generates electricity in optimal operating condition pointIt a part of can work for driving motor, another part is power battery charging, it not only ensure that the normal work of driving motor, but alsoFor the power battery charging of low battery, be conducive to improve power battery service life.
The power follow-up control method of a kind of range-extended electric automobile provided in an embodiment of the present invention, first according to powerBattery dump energy value SOC and vehicle power demand Pdemand, judge that distance increasing unit opens or closes, optimized in deterministic processDistance increasing unit determines the window of starting, avoids type range extender engine frequent starting, improves driving experience；When distance increasing unit close when byPower battery is that driving motor power supply further judges the generated output P of distance increasing unit when distance increasing unit is openedAPU, and control increasingJourney device works in generated output PAPUUnder, finally exist in conjunction with the work of the Properties Control distance increasing unit of the engine of distance increasing unit and generatorMeet generated output PAPUOptimized operation operating point, when the generated output of distance increasing unit follows vehicle power demand, distance increasing unit hairElectricity meets driving motor, effectively prevent power battery high power discharge, is conducive to improve power battery service life；Work as distance increasing unitInvariable power generates electricity in optimal operating condition point, be that driving motor powers and is power battery charging, reduces vehicle energy consumption and excellentEngine emission is changed.
Embodiment two
Fig. 3 or Fig. 4 is please referred to, the embodiment of the invention provides a kind of power model- following control systems of range-extended electric automobileSystem, using the power follow-up control method of above-mentioned range-extended electric automobile, the power model- following control of range-extended electric automobileSystem includes distance increasing unit, power battery, controller and driving motor interconnected, and controller includes acquisition module, firstJudgment module and the second judgment module, wherein the input terminal connection power battery and driving motor of acquisition module, output end connectionFirst judgment module, the input terminal of output end the connection power battery and third judgment module of first judgment module, third judgementThe output end of module connects distance increasing unit.
Acquisition module is connected to the ginseng such as the nonshared control unit of power battery or voltage, the electric current of directly acquisition power batteryNumber is according to current integration method, the method for estimating remaining capacity based on equivalent-circuit model or extended Kalman filter and its changesThe residual electric quantity SOC current into the acquisition power battery such as method；It is also used to acquire acceleration index of driving motor etc. to surveyCalculate vehicle power demand Pdemand。
First judgment module is used for according to residual electric quantity SOC and vehicle power demand Pdemand, judge and control increasing journeyDevice opens or closes；It is also used to when the working condition of distance increasing unit is closes, controls power battery as driving motor power supply, please joinFig. 3 is read, the Rule of judgment that distance increasing unit determines starting is optimized in deterministic process, avoids type range extender engine frequent starting, is improvedDriving experience.
Second judgment module is used to further judge the generated output of distance increasing unit when distance increasing unit working condition is to openPAPUAnd control distance increasing unit and open work, when the generated output of distance increasing unit follows vehicle power demand, distance increasing unit power generation, which meets, is drivenDynamic motor, effectively prevent power battery high power discharge, is conducive to improve power battery service life；When distance increasing unit invariable power is sent outElectricity in optimal operating condition point, be driving motor power supply and be power battery charging, reduce vehicle energy consumption and optimize and startMachine discharge.
Specifically, first judgment module includes the first storage unit and the first judging unit, the input of the first judging unitEnd is separately connected the first storage unit and acquisition module, and output end is separately connected power battery and the second judgment module.
First storage unit is for being pre-stored the first power demand threshold value Phigh, remaining capacity lower limit value SOCminAnd residueElectricity upper limit value SOCmax, wherein the first power demand threshold value PhighIt is determined according to power battery 3C discharge power limit.
First judging unit is used for according to residual electric quantity SOC and vehicle power demand PdemandJudge distance increasing unit open orIt closes:
As SOC < SOCminAnd/or Pdemand> PhighWhen, distance increasing unit is opened, and is avoided power battery over-discharge, is extendedThe service life of power battery；
As SOC >=SOCmaxAnd Pdemand≤PhighWhen, distance increasing unit is closed, and power battery can satisfy vehicle completely at this timePower demand, close distance increasing unit reduce energy loss；
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PhighWhen, the working condition of distance increasing unit remains unchanged, and avoids increasingJourney device engine frequent starting, improves driving experience.
Preferably, the second judgment module includes the second storage unit and second judgment unit, the input of second judgment unitEnd is separately connected the second storage unit and the first judging unit, and the output end of second judgment unit connects distance increasing unit.
Second storage unit is for storing the second power demand threshold value PmaxWith third power demand threshold value Pmin, wherein theTwo power demand threshold value PmaxIt is determined by the high efficiency range of distance increasing unit, that is, discharged by the engine fuel efficiency of distance increasing unit,The calculating such as generator efficiency calculate the second power demand threshold value Pmax；Third power demand threshold value PminIt is put according to power battery 0.3CThe electrical power limit determines.
Second judgment unit is used to judge the generated output of distance increasing unit, and controls distance increasing unit power generation:
Work as Pdemand> PhighWhen, the generated output of distance increasing unit follows vehicle power demand, remains PAPU=Pdemand,Distance increasing unit power generation avoids power battery high power discharge, is conducive to improve power battery service life for supplying driving motor；
As SOC < SOCminAnd Pmax< Pdemand≤PhighWhen, the power generation of distance increasing unit invariable power, and PAPU=Phigh, increase journeyDevice is with invariable power PhighIn optimal operating condition point, distance increasing unit power generation is driving motor power supply and is power battery charging for power generation, is hadConducive to optimization engine emission and oil consumption；
As SOC < SOCminAnd Pmin< Pdemand≤PmaxWhen, the generated output of distance increasing unit follows vehicle power demand, beginsP is kept eventuallyAPU=Pdemand, distance increasing unit power generation reduces power battery electric discharge, is conducive to improve power electric for supplying driving motorPond service life；
As SOC < SOCminAnd Pdemand≤PminWhen, the power generation of distance increasing unit invariable power, and
PAPU=Pmin, distance increasing unit is with invariable power PminPower generation in optimal operating condition point, distance increasing unit power generation be driving motor power withAnd be power battery charging, be conducive to optimize engine emission and oil consumption.
In conventional measures shown in FIG. 1, when the small Mr. Yu of vehicle demand power is worth, distance increasing unit will be closed, and often will appear increasingThe case where journey device frequent start-stop.A kind of power follow-up control method of range-extended electric automobile provided in an embodiment of the present inventionIn, when the small Mr. Yu's value of vehicle demand power, distance increasing unit generates electricity invariable power, supplies vehicle driving motor and air-conditioning, PTC, soundOther power attachmentes such as acoustic system use, while giving power battery charging, avoid distance increasing unit frequent start-stop, improve extended-rangePure electric vehicle driving experience.
Further, the second judgment unit is also used to work as SOCmin≤ SOC < SOCmax、Pdemand≤PhighAnd increaseJourney device previous moment is open state, that is, when needing to keep it turning on, judges the generated output of the distance increasing unit:
Work as SOCmin≤ SOC < SOCmaxAnd Pmax< Pdemand≤PhighWhen, the distance increasing unit invariable power power generation, andPAPU=Pmax, distance increasing unit is with invariable power PmaxPower generation is conducive to optimize engine emission and oil consumption, distance increasing unit in optimal operating condition pointIt produces electricl energy and works for driving motor, insufficient part is discharged polishing by power battery, ensure that the normal work of driving motorMake, and power battery over-discharge is prevented to be conducive to improve power battery service life.
Work as SOCmin≤ SOC < SOCmaxAnd Pmin< Pdemand≤PmaxWhen, the generated output of the distance increasing unit follows vehiclePower demand remains PAPU=Pdemand, distance increasing unit is produced electricl energy to work for driving motor, power battery electric discharge is reduced,Be conducive to improve power battery service life.
Work as SOCmin≤ SOC < SOCmaxAnd Pdemand≤PminWhen, the distance increasing unit invariable power power generation, and PAPU=Pmin, distance increasing unit is with invariable power PminPower generation is conducive to optimize engine emission and oil consumption, distance increasing unit generates electricity in optimal operating condition pointIt a part of can work for driving motor, another part is power battery charging, it not only ensure that the normal work of driving motor, but alsoFor the power battery charging of low battery, be conducive to improve power battery service life.
Preferably, distance increasing unit includes the generator and engine interconnected, and second judgment unit further includes operating conditionsDevice, condition controller are connect with generator and engine signal respectively；Condition controller be used in conjunction with engine emission, efficiency,NVH and generator efficiency, the work of NVH real-time control distance increasing unit are meeting generated output PAPUOptimized operation operating point, whereinThe parameter of running operating point includes power generation revolving speed and power generation torque, can be stored in special memory and by special by calibrationDoor controller obtains in real time and is sent to distance increasing unit, also can use special controller and is calculated in real time and is sent to increasing journeyDevice, control engine work according to the power generation revolving speed and power generation torque that are calculated and generator are driven to work, and generatorOutput meets generated output PAPU.Distance increasing unit work is conducive to the discharge and combustion that optimize engine in distance increasing unit in optimal operating condition pointOil.
Please continue to refer to Fig. 4, a kind of power model- following control system of range-extended electric automobile provided in an embodiment of the present inventionSystem further includes power converter, and power converter is separately connected power battery, driving motor and generator, and power converter is usedAC-DC conversion, which is carried out, in the electric energy that generates generator is conveyed to driving motor and/or power battery, by the electricity of power batteryDriving motor and control driving motor work can be conveyed to.
A kind of power following control system of range-extended electric automobile disclosed by the embodiments of the present invention is implemented using upper oneThe power follow-up control method of range-extended electric automobile in example, solves engine fuel under conventional power follow the mode and disappearsConsumption and discharge be unable to reach it is optimal, and the problem of engine frequent starting.
In the description of above embodiment, particular features, structures, materials, or characteristics can be at any one or moreIt can be combined in any suitable manner in a embodiment or example.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, anyThose familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all containLid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.