• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for gear shifting in a hybrid powertrain, comprising an internal combustion engine (2); an electric machine (6); a gearbox (8); and an energy storage unit (18) connected to the electric machine (6), wherein at least one control unit (20) is arranged in communication with the internal combustion engine (2), the electric machine (6), the gearbox (8) and the energy storage unit (18). The method comprises the steps of: determining (s101) the energy level in the energy storage unit (18); determining (s102) the acceleration ability with a subsequent gear; determining (s103) a target engine speed for the internal combustion engine (2) based on the energy level in the energy storage unit (18) and the acceleration ability; and controlling (s104) the gear shifting based on the target engine speed.The invention also relates to a system (30) for gear shifting in a hybrid powertrain (3), a vehicle (1) comprising such a system (30), a computer program (P) and a computer program product.(Fig. 3)
    公开号:SE1551560A1
    申请号:SE1551560
    申请日:2015-12-01
    公开日:2017-06-02
    发明作者:Kourie Afram
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    A method and system for gear shifting in a hybrid powertrainTECHNICAL FIELDThe present invention relates to a method for gear shifting in a hybridpowertrain, a system for gear shifting in a hybrid powertrain, a vehiclecomprising such a system, a computer program and a computer programproduct according to the appended ciaims.
    BACKGROUNDHybrid pewertrains rnay be driven hy a primary prepeisiert means such as aninternai eemhiistien engine and a secondary prepuisien means such as aneieetrie rnaehine. The eiectrie inaehine is egtiipped with at ieast ene energystorage, stieh as an eieetreehentieai energy sterage ter stering eieetricaienergy and a eentrei tinit te centret the tiew ei eieetrieai energy between theertergy sterage and the eieetrie inaehine. The eiectric ntaehine may titusaiternateiy eperate as a meter and a generator, isased en the eperatingeenditien ei the vehicie. When the vehieie is hraiting, the eieetrie rhachiriegenerates eiectricai energy, witieh is stered in the eitergy storage. "the steredeieetrieai energy may he utiiized iater ter the prepuisien et the vehieie.
    Atrtentatie gear shifting preeediires typieaiiy inveives eentreiiing the pewertrain,such that the internai eernhustien engine maintains an eptimtiin engine speed,i.e. a target engine speed. ii the engine speed is tee high upshitting isperiernted and the engine speed is thus decreased. Simiiariy, ii the enginespeed is tee iew dewnshiiting is perterrned and the engine speed is increased.The eptimurn engine speed rnay he detemtined based en desired iueiconsumption, perierrrtanee er simiiar. The engine speed aiteets the ttieicensumptien and it is theretere desired te keep the engine speed as ievy aspessihie white ntaintaining the drive terdue ieduested hy the driver.iïiocurrient USQQtSÜQQYißE At describes a method te dynamicaiiy adapt ashiftirig pattern based en information regarding the engine speed oi theinternai cernhtistion engine and the engine speed ef the eiectric rnoter in orderte eptiinise the feet consumption. Üectiinent Uåïft-Üíf-flieâ 32 describes a shiftcentret apparatus for a contintiotisiy variabie transmission where the shiftpattern is changed according to the remaining charge of a battery. The shiftpattern deee net change during running. According to the document the eitiiftpattern is changed, such thai the gear ratie is iovver tifhen the battery isinetifficientiy charged.
    SUMMARY OF THE INVENTIONDespite known solutions in the field, there is still a need to develop a methodfor gear shifting in a hybrid powertrain, which reduces the fuel consumptionwhile optimizing the drivability and the performance.
    An object of the present invention is to achieve an advantageous method forgear shifting in a hybrid powertrain, which reduces the fuel consumption whileoptimizing the drivability and the performance.
    Another object of the invention is to achieve an advantageous system for gearshifting in a hybrid powertrain, which reduces the fuel consumption whileoptimizing the drivability and the performance.
    The herein mentioned objects are achieved by a method for gear shifting in ahybrid powertrain, a system for gear shifting in a hybrid powertrain, a vehicle, acomputer program and a computer program product according to theindependent claims.
    According to an aspect of the invention a method for gear shifting in a hybridpowertrain is provided. The hybrid powertrain comprises an internalcombustion engine; an electric machine; a gearbox; and an energy storageunit connected to the electric machine, wherein at least one control unit isarranged in communication with the internal combustion engine, the electricmachine, the gearbox and the energy storage unit. The method comprises thesteps of:- determining the energy level in the energy storage unit;- determining the acceleration ability with the subsequent gear;- determining a target engine speed for the internal combustion engine basedon the energy level in the energy storage unit and the acceleration ability; and- controlling the gear shifting based on the target engine speed.
    The method steps are suitaeiy performed ey means ef the eentrei unit. Thecontrei unit may determine the energy ievei in the energy storage unit bymeans et a veitage sensor eenneeted to the energy storage unit and theoentrei unit.
    The subsequent gear is seitaeiy a higher gear. Thus, the step te determine theaceeieratien abiiity with the subsequent gear suitabiy inciudes determining theaeceieratien abiiity with the subsequent gear in case et upshitting.
    The tereue previeed hy an internai eemetistien engine may yary eepending enthe engine speed. Typioaiiy, the tergue increases when the engine speedinereases, up to a eertain maximum ievei where the tereue is essentiaiiyeenstant irrespeetitfeiy ei an increase in engine speed. i-ioweyen when theengine speed inereases further and reaehes a certain high ievei the enginetereue may start deereasirtg frem the maximum ievei. Thes, the internaicoineestion engine is net aieie to provide the maximum teroue at tee iowengine speeds er tee high engine seeeois, iieyveyer, an eieetrie machine maybe abie te provide the same maximum torgue essentiaiiy immeciiateiy, i.e. atiew engine speeeis, Wiien upshitting is performed the engine speee et theinternet oembustien engine wiii deerease due te the tower gear ratio ef thesubsequent higher gear. Gear shitting generaiiy ineiuees eentreiiing theiniernei ceinbuetien engine iewarde e. iergei engine speed. if ine targei enginespeed een be nieinieined ei the subsequent nigher geer, the upeniiting isperfernied. The fewer ine iergei engine speed is ine eeriier iipsnifiing ispeesibie. i-ieweven ii ine iergei engine speed is tee few er ine iipsnifiing foreny einer reesen ie pertermed tee eeriy, ine engine speed may deereese ie eievei wnere ine internai cenibusiien engine net ie ebie ie previde ine desiredierdiie. Tnerefere, ine iergei engine speed ie nerrneiiy sei ie e reieiiveiy nighievei, eden inet ii is eneured inet ine iniernei cembustien engine can prevideine maximum ierqiie efter upsniiting. Wniie ihis rney be edveniegeeus fornieiriieiriing ine perierrnerice end driveebiiiriy ef ine venieie, nign enginespeeds wiii effect ine fuei eensiiriipiien negaiiveiy. By determining ine energyievei et ine energy sierege iinii, determining the acceleration ability with thesubsequent gear and determining a target engine speed for the internalcombustion engine based on the energy level in the energy storage unit andthe acceleration ability, gear shifting is achieved which enables a morefrequent use of the electric machine and less use of the internal combustionengine. This way, a method for gear shifting is achieved which minimizes thefuel consumption. Also, by determining the target engine speed based on theacceleration ability with the subsequent gear the driveability is considered.
    The acceleration ability is suitably defined as the acceleration which is possibleto achieve when having changed to the subsequent gear.
    Suitably, the target engine speed is determined such that it is set to a firstengine speed when the determined energy level is below a threshold leveland/or the determined acceleration ability is below a threshold level. Preferably,the target engine speed is determined such that it is set to a second enginespeed when the determined energy level is above the threshold level and thedetermined acceleration ability is above the threshold level, wherein thesecond engine speed is lower than the first engine speed. This way, when it isdetermined that the energy level in the energy storage unit is above athreshold level, and the acceleration ability is above a threshold level theenergy level may be used during gear shifting to drive the electric machine.The electric machine may then be able to provide torque in addition to thetorque provided by the internal combustion engine. This way, upshifting can beperformed at lower engine speeds even if it results in that the internalcombustion engine cannot provide the desired torque at the subsequent gear.Hence, by determining the target engine speed based on the energy level andthe acceleration ability upshifting may be performed earlier, at lower enginespeeds, and the fuel consumption can be minimized while fulfilling the torquerequirements and optimizing the driveability. Also, by only allowing a lowertarget engine speed when the energy level and the acceleration ability areabove a certain level, it is ensured that the torque requirements are fulfilledand the driveability is thereby optimized.
    Controlling the gear shifting based on the target engine speed suitablyincludes controlling the internal combustion engine, the gearbox and theelectric machine. Controlling the gear shifting based on the target enginespeed suitably includes changing gears such that the internal combustionengine essentially maintains the target engine speed.
    The energy threshold level may be a predetermined arbitrary energy level. Theenergy threshold level is suitably an energy level enough for the electricmachine to provide a minimum torque. The energy threshold level is suitablyan energy level enough for the electric machine to provide a minimum torqueduring a certain time period or during a certain distance, for example150-400meters. The minimum torque may be a predetermined arbitrary torque value.
    According to an aspect of the invention the acceleration ability with thesubsequent gear is determined based on the traction force provided with thesubsequent gear and the current driving resistance. The traction forceprovided with a certain gear is based on the provided torque, the gear ratioand the radius of the gearwheel. Higher gears have lower gear ratio than lowergears, thus the traction force with higher gears is lower than the traction forcewith lower gears, at the same provided torque. The current driving resistancemay be based on the inclination of the road, air resistance and/or ro|ingresistance or similar. When the traction force is larger than the drivingresistance a positive acceleration is achieved. The acceleration ability is thusdetermined as the acceleration achieved based on the traction force providedwith the subsequent gear and the current driving resistance. By determiningthe acceleration ability with the subsequent gear it can be determined whetherthe acceleration will be enough not to affect the driveability negatively whenchanging to a higher gear. By determining the target engine speed based onthe determined acceleration ability it is ensured that the driveability isoptimized during gear shifting. The threshold level of the acceleration ability issuitably an arbitrary predetermined acceleration level. The threshold level ofthe acceleration ability may be an acceleration around 0,3-0,8 m/s2. By settinga lower target engine speed, only when the acceleration ability is above athreshold level it is ensured that the driveability is optimized while minimizingthe fuel consumption.
    According to an aspect of the invention the second engine speed is based onthe first engine speed. Suitably, the second engine speed is determined as thefirst engine speed decreased with a predetermined factor. The predeterminedfactor may be a percentage. The first engine speed may be the normal targetengine speed, the starting point, which is used as long as the energy level andthe acceleration ability do not comply with the requirements (threshold levels).The predetermined factor suitably depends on the energy level and theacceleration ability. The higher the energy level and the acceleration ability arethe larger is the factor. Thus, the higher the energy level and the accelerationability are the lower is the second engine speed. Thus, when there is a bigdifference between the determined energy level and acceleration ability andtheir respective threshold levels, the target engine speed is lower. This way itis ensured that the determined target engine speed is dynamically adapted tothe prevailing conditions regarding the available energy level and theacceleration ability.
    Alternatively, the second engine speed is an arbitrary predetermined enginespeed, lower than the first engine speed. The second engine speed suitablydepends on the determined energy level and the determined accelerationability. The second engine speed is suitably lower the higher the determinedenergy level and acceleration ability is.
    According to an aspect of the invention the electric machine is controlledbased on the determined target engine speed. The electric machine is suitablycontrolled to provide torque when the target engine speed is set to the secondengine speed. When the second engine speed is set as the target enginespeed, the target engine speed is decreased and upshifting is performedearlier than when the target engine speed is set to the first engine speed. Thus,when the gear shifting results in the internal combustion engine not being ableto provide a desired torque at the subsequent gear, the electric machine iscontrolled to provide the missing torque. This way, upshifting may beperformed earlier, fuel consumption is minimized and the driveability isoptimized. The electric machine is suitably controlled by the control unit and isdriven by electric current/energy from the energy storage unit.
    According to an aspect of the invention the method further comprises the stepof, prior to determining the target engine speed:- determining the functionality of the electric machine.
    By determining the energy level in the energy storage unit before determiningthe target engine speed it is ensured that enough energy is available to drivethe electric machine. However, it is also important that the condition of theelectric machine fulfils certain requirements or the electric machine might notbe able to provide the desired torque irrespectively of the energy level in theenergy storage unit. The method thus preferably comprises to determinewhether the functionality of the electric machine is sufficient to provide aminimum torque, prior to determining the target engine speed. The minimumtorque may be a predetermined arbitrary torque value. The minimum torquemay be a predetermined torque value determined based on experience, i.e.empirically determined. Thus, if it is determined that the functionality of theelectric machine is not sufficient to provide the minimum torque, the firstengine speed is determined as the target engine speed. Similarly, if it isdetermined that the functionality of the electric machine is sufficient to providethe minimum torque, the second engine speed may be determined as thetarget engine speed, provided that the energy level and the acceleration abilityare above their threshold levels. The functionality of the electric machine maybe determined based on torque signals from the electric machine. Thefunctionality may also be determined by determining the temperature of theelectric machine. The temperature of the electric machine affects the overallperformance of the electric machine and it is therefore advantageous todetermine the temperature of the electric machine prior to determining thetarget engine speed. The performance of the electric machine is typicallydeteriorated when the temperature is too high. Suitably, when the determinedtemperature is above a temperature threshold the first engine speed isdetermined as the target engine speed. The second engine speed is suitablydetermined as the target engine speed when the temperature of the electricmachine is below a temperature threshold, the energy level is above theenergy level threshold and the acceleration ability is above the threshold levelof the acceleration ability.
    According to an aspect of the invention the target engine speed is determinedbased on a position of an accelerator pedal. Suitably, the first engine speed isdetermined based on a position of the accelerator pedal. The second enginespeed may thereby also be determined based on the position of theaccelerator pedal. Thus, different positions of the accelerator pedal areassociated with different first engine speeds and different second enginespeeds. This way, the target engine speed is different for different positions ofthe accelerator pedal. The target engine speed is suitably higher the moredepressed the accelerator pedal is. The accelerator pedal is suitably linkedeither electronically, mechanically or by other systems to the control unit suchthat the control unit can determine the position of the accelerator pedal. Thefirst engine speed is suitably predetermined and stored in the control unit. Thefirst engine speed may be determined based on requested torque, driveability,and requested fuel consumption or similar. The first engine speed is suitablypredetermined based on experience, i.e. empirically determined.
    According to an aspect of the invention a system for gear shifting in a hybridpowertrain is provided. The powertrain comprises an internal combustionengine; an electric machine; a gearbox; and an energy storage unit connectedto the electric machine, wherein at least one control unit is arranged incommunication with the internal combustion engine, the electric machine, thegearbox and the energy storage unit. The control unit is adapted to determinethe energy level in the energy storage unit, determine the acceleration abilitywith the subsequent gear in case of upshifting, determine a target enginespeed for the internal combustion engine based on the energy level in theenergy storage unit and the acceleration ability; and control the gear shiftingbased on the target engine speed.
    The hybrid powertrain may comprise a clutch arranged between the internalcombustion engine and the electric machine. The crankshaft of the internalcombustion engine is thus suitably connected to one side of the clutch and theelectric machine is connected to the other side of the clutch. The gearbox maycomprise an input shaft connected to the electric machine and an output shaftconnected to driving wheels of a vehicle. The gearbox may further comprise alay shaft arranged in connection to the input shaft and a main shaft, where themain shaft is connected to the output shaft.
    The control unit is suitably adapted to control the internal combustion engine,the clutch, the electric machine and the gearbox. A computer may beconnected to the control unit.
    The control unit is suitably adapted to determine the target engine speed suchthat it is set to a first engine speed when the determined energy level is belowa threshold level and/or the determined acceleration ability is below athreshold level.
    The control unit is suitably further adapted to determine the target enginespeed such that it is set to a second engine speed when the determinedenergy level is above the threshold level and the determined accelerationability is above the threshold level, wherein the second engine speed is lowerthan the first engine speed.
    Further objects, advantages and novel features of the present invention willbecome apparent to one skilled in the art from the following details, and alsoby putting the invention into practice. Whereas the invention is describedbelow, it should be noted that it is not restricted to the specific detailsdescribed. Specialists having access to the teachings herein will recognisefurther applications, modifications and incorporations within other fields, whichare within the scope of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGSFor fuller understanding of the present invention and further objects andadvantages of it, the detailed description set out below should be read togetherwith the accompanying drawings, in which the same reference notationsdenote similar items in the various diagrams, and in which:Figure 1 schematically illustrates a vehicle according to an embodiment ofthe invention;Figure 2 schematically illustrates a system according to an embodiment ofthe invention;11Figure 3 schematically illustrates a flow chart for a method for gear shiftingin a hybrid powertrain according to an embodiment of theinvention; andFigure 4 schematically illustrates a control unit or computer according to anembodiment of the invention.
    DETAILED DESCRIPTION OF THE DRAWINGSFigure 1 schehtaticaiiy shotivs a side view of a hybrid vehicie “i according to anembodiment of the invention. A hybrid vehioie is considered to be a vehioiewith a tiyhrid powertrain, such that the vehioie may be propeiied by an internaicombustion engine and/or an eieotric rnaohine. The tfehioie 1 comprises asystem 30 for gear sitifting in a hybrid powertrain 3. The hybrid powertrain 3comprises an internai combustion engine 2, an eiectrio machine 6 (not shovvn)and a gearbox 8. The eieotric rnaohine 6 is oonneoted to the gearbox 8. Thegearbox 8 is aiso connected to the driving tfvheeis tO of the vehicie 'i throughan otitpot shaft 16. The vehicle 1 may be a heavy vehicle, e.g. a truck or a bus.
    The vehicle 1 may alternatively be a passenger car.
    Figure 2 sohernatioaiiy shows a system 30 for gear shifting in a hybridpowertrain 3 of a vehicle 1 according to an embodiment of the invention. Thehybrid powertrain 3 comprises a combustion engine 2, a clutch 4, an electricmachine 6 and a gearbox 8. The crankshaft 12 of the combustion engine 2 isconnected to one side of the clutch 4 and the electric machine 6 is connectedto the other side of the clutch 4. The clutch 4 is thus arranged between thecombustion engine 2 and the electric machine 6. The gearbox 8 comprises aninput shaft 14 connected to the electric machine 6 and an output shaft 16connected to the driving wheels 10 of the vehicle 1. Only two driving wheels 10are illustrated in Figure 2, however, any number of driving wheels 10 may bedriven by the hybrid powertrain 3 within the scope of the invention. An energy12storage unit 18 is arranged in communication with the electric machine 6 forsupply of electric energy/current to drive the electric machine 6.
    The combustion engine 2, the clutch 4, the electric machine 6, the gearbox 8and the energy storage unit 18 are arranged in connection to a control unit 20.The control unit 20 is adapted to control the combustion engine 2, the clutch 4,the electric machine 6 and the gearbox 8, for example for gear shifting. Acomputer 22 may be connected to the control unit 20. The control unit 20 issuitably adapted to determine the energy level in the energy storage unit 18,determine the acceleration ability with the subsequent gear, determine a targetengine speed for the internal combustion engine 2 based on the energy levelin the energy storage unit 18 and the acceleration ability; and control the gearshifting based on the target engine speed.
    Figure 3 shows a flowchart for a method for gear shifting in a hybrid powertrain3 according to an embodiment of the invention. The hybrid powertrain 3 isconfigured as described in relation to Figure 2. The hybrid powertrain 3comprises an internal combustion engine 2, an electric machine 6, a gearbox 8and an energy storage unit 18 arranged in communication with the electricmachine 6. At least one control unit 20 is arranged in communication with theinternal combustion engine 2, the electric machine 6, the gearbox 8 and theenergy storage unit 18. The method comprises the steps of determining s101the energy level in the energy storage unit; determining s102 the accelerationability with the subsequent gear; determining s103 a target engine speed forthe internal combustion engine based on the energy level in the energystorage unit and the acceleration ability; and controlling s104 the gear shiftingbased on the target engine speed. Ešy determining the energy level of theenergy storage unit 18, determining the acceleration ability with thesubsequent gear and determining a target engine speed for the internalcombustion engine 2 based on the energy level in the energy storage unit 18and the acceleration ability, gear shifting is achieved which enables a morefrequent use of the electric machine 6 and less use of the internal combustion13engine 2. This way, a method for gear shifting is achieved which minimizes thefuel consumption. Also, by determining the target engine speed based on theacceleration ability with the subsequent gear the driveability is optimized.
    The rnethed steps are suitahiy perterrned hy means of the centret tihit 20. Thecentret trnit 2G they determine the energy ievet in the energy storage unit tå byrrieans of a veitage sensor connected to the energy storage unit tíš and thecentret unit 2G.
    The subsequent gear is stiitahây a higher gear. Thus, the step st G2 tedetermine the acceieratiert abiitty with the subsequent gear snitabiy inciudesdetermining the acceieratien ahšiity with the subsequent higher gear, in case ciupshifting.
    The step to determine s103 the target engine speed suitably comprises to setthe target engine speed to a first engine speed when the determined energylevel is below a threshold level and/or the determined acceleration ability isbelow a threshold level. The step to determine s103 the target engine speedsuitably further comprises to set the target engine speed to a second enginespeed when the determined energy level is above the threshold level and thedetermined acceleration ability is above the threshold level, wherein thesecond engine speed is lower than the first engine speed. This way, when it isdetermined that the energy level in the energy storage unit 18 is above athreshold level, and the acceleration ability is above a threshold level theenergy level may be used during gear shifting to drive the electric machine 6.Since the energy level and the acceleration ability are above their thresholdlevels, the electric machine 6 may be able to provide torque and upshifting canthereby be performed at a lower engine speed even though it results in theinternal combustion engine 2 not being able to provide the desired torque atthe subsequent gear. Hence, by determining the target engine speed based onthe energy level and the acceleration ability upshifting may be performed14earlier, at lower engine speeds, and the fuel consumption can be minimizedwhile fulfilling the torque requirements.
    The energy threshold level may be a predetermined arbitrary energy level. Theenergy threshold level is suitably an energy level enough for the electricmachine 6 to provide a minimum torque. The energy threshold level is suitablyan energy level enough for the electric machine 6 to provide a minimum torqueduring a certain time period or during a certain distance. The energy thresholdlevel is suitably stored in the control unit 20.
    The step to control s104 the gear shifting based on the target engine speedsuitably includes controlling the internal combustion engine 2, the gearbox 6and the electric machine 6. Controlling the gear shifting based on the targetengine speed suitably includes changing gears such that the internalcombustion engine 2 essentially maintains the target engine speed.
    The acceleration ability with the subsequent gear is suitably determined in steps102 based on the traction force provided with the subsequent gear and thecurrent driving resistance. The traction force provided with a certain gear isbased on the provided torque, the gear ratio and the radius of the gearwheel.Higher gears have lower gear ratio than lower gears, thus the traction forcewith higher gears is lower than the traction force with lower gears, at the sameprovided torque. The current driving resistance may be based on theinclination of the road, air resistance and/or rolling resistance or similar. Whenthe traction force is larger than the driving resistance a positive acceleration isachieved. The control unit 20 suitably determines the traction force, the currentdriving resistance and the acceleration ability of the subsequent higher gear.
    The threshold level of the acceleration ability is suitably an arbitrarypredetermined acceleration level. The threshold level of the acceleration abilitymay be an acceleration around 0,5-0,8 m/s2. By setting a lower target enginespeed, only when the acceleration ability is above a threshold level it isensured that the driveability is optimized while minimizing the fuel consumption.
    The threshold level of the acceleration ability is suitably stored in the controlunit 20.
    The second engine speed is suitably determined based on the first enginespeed. The second engine speed is suitably calculated as the first enginespeed decreased with a predetermined factor. The predetermined factorsuitably depends on the determined energy level and the determinedacceleration ability. Suitably, the higher the energy level respectivelyacceleration ability the larger the factor and thus the lower the second enginespeed. Thus, when the energy level and acceleration ability are much abovetheir threshold levels, the target engine speed is lower. This way it is ensuredthat the determined target engine speed is dynamically adapted to theavailable energy level and the acceleration ability. The predetermined factor issuitably stored in the control unit 20 such that the control unit 20 can calculatethe second engine speed.
    Alternatively, the second engine speed is an arbitrary predetermined enginespeed, lower than the first engine speed.
    The method suitably comprises to control the electric machine 6 based on thedetermined target engine speed. The electric machine 6 is suitably controlledto provide torque when the target engine speed is set to the second enginespeed. When the second engine speed is set as the target engine speed, thetarget engine speed is decreased and upshifting may be performed earlier.Thus, when the upshifting results in that the internal combustion engine 2cannot provide a desired torque at the subsequent gear, the electric machine 6is controlled to provide the missing torque. This way, upshifting may beperformed earlier, fuel consumption is minimized and the driveability isoptimized.16The method suitably further comprises the step of, prior to determining thetarget engine speed, determining s105 the functionality of the electric machine6. By determining the energy level in the energy storage unit 18 beforedetermining the target engine speed it is ensured that enough energy isavailable to drive the electric machine 6 such that the electric machine 6 canprovide a minimum torque. However, it is also important that the condition ofthe electric machine 6 fulfils certain requirements or the electric machine 6might not be able to provide the desired torque irrespectively of the energylevel in the energy storage unit 18. The method thus preferably comprises todetermine whether the functionality of the electric machine 6 is sufficient toprovide a minimum torque, prior to determining the target engine speed. Theminimum torque may be a predetermined arbitrary torque value. Thus, if it isdetermined that the functionality of the electric machine 6 is not sufficient toprovide the minimum torque, the first engine speed is determined as the targetengine speed. Similarly, if it is determined that the functionality of the electricmachine 6 is sufficient to provide the minimum torque, the second enginespeed may be determined as the target engine speed, provided that theenergy level and the acceleration ability are above their threshold levels. Thefunctionality of the electric machine 6 may be determined based on torquesignals from the electric machine 6. lt may also be determined by determiningthe temperature of the electric machine 6. The temperature of the electricmachine 6 affects the overall performance of the electric machine 6 and it istherefore advantageous to determine the temperature of the electric machine 6prior to determining the target engine speed. Suitably, when the determinedtemperature is above a temperature threshold the first engine speed isdetermined as the target engine speed. The second engine speed is suitablydetermined as the target engine speed when the temperature of the electricmachine is below a temperature threshold, the energy level is above theenergy level threshold and the acceleration ability is above the threshold levelof the acceleration ability. The temperature threshold is suitably apredetermined value stored in the control unit 20.17The target engine speed may be determined in step s103 based on a positionof an accelerator peda|. The first engine speed may be determined based onthe position of the accelerator peda| and the second engine speed maythereby also be based on the position of the accelerator peda|. This way, thetarget engine speed is different for different positions of the accelerator peda|.The target engine speed is suitably higher the more depressed the acceleratorpeda| is. The accelerator peda| is suitably linked either electronically,mechanically or by other systems to the control unit 20 such that the controlunit 20 can determine the position of the accelerator peda|.
    Figure 4 schematically illustrates a device 500. The control unit 20 and/orcomputer 22 described with reference to Fig. 2-Fig. 3 may in a versioncomprise the device 500. The term “link” refers herein to a communication linkwhich may be a physical connection such as an optoelectronic communicationline, or a non-physical connection such as a wireless connection, e.g. a radiolink or microwave link. The device 500 comprises a non-volatile memory 520, adata processing unit 510 and a read/write memory 550. The non-volatilememory 520 has a first memory element 530 in which a computer program, e.g.an operating system, is stored for controlling the function of the device 500.The device 500 further comprises a bus controller, a serial communication port,l/O means, an A/D converter, a time and date input and transfer unit, an eventcounter and an interruption controller (not depicted). The non-volatile memory520 has also a second memory element 540.
    There is provided a computer program P which comprises routines for amethod for gear shifting in a hybrid powertrain 3 according to the invention.The computer program P comprises routines for determining the energy levelin the energy storage unit. The computer program P comprises routines fordetermining the acceleration ability with the subsequent gear in case ofupshifting. The computer program P comprises routines for determining atarget engine speed based on the determined energy level and the determinedacceleration ability. The computer program P comprises routines for controlling18gear shifting based on the determined target engine speed. The computerprogram P comprises routines for determining the functionality of the electricmachine. The computer program P comprises routines for determining thetemperature of the electric machine. The computer program P comprisesroutines for determining the ability of the electric machine to provide aminimum torque. The program P may be stored in an executable form or in acompressed form in a memory 560 and/or in a read/write memory 550.
    Where the data processing unit 510 is described as performing a certainfunction, it means that the data processing unit 510 effects a certain part of theprogram stored in the memory 560 or a certain part of the program stored inthe read/write memory 550.
    The data processing device 510 can communicate with a data port 599 via adata bus 515. The non-volatile memory 520 is intended for communication withthe data processing unit 510 via a data bus 512. The separate memory 560 isintended to communicate with the data processing unit 510 via a data bus 511.The read/write memory 550 is adapted to communicating with the dataprocessing unit 510 via a data bus 514.
    When data are received on the data port 599, they are stored temporarily inthe second memory element 540. When input data received have beentemporarily stored, the data processing unit 510 is prepared to effect codeexecution as described above.
    Parts of the methods herein described may be effected by the device 500 bymeans of the data processing unit 510 which runs the program stored in thememory 560 or the read/write memory 550. When the device 500 runs theprogram, methods herein described are executed.
    The foregoing description of the preferred embodiments of the presentinvention is provided for illustrative and descriptive purposes. lt is not intended19to be exhaustive or to restrict the invention to the variants described. Manymodifications and variations will obviously be apparent to one skilled in the art.
    The embodiments have been chosen and described in order best to explainthe principles of the invention and its practical applications and hence make itpossible for specialists to understand the invention for various embodimentsand with the various modifications appropriate to the intended use.
    权利要求:
    Claims (16)
    [1] 1. A method for gear shifting in a hybrid powertrain, comprising an internalcombustion engine (2); an electric machine (6); a gearbox (8); and an energystorage unit (18) connected to the electric machine (6), wherein at least onecontrol unit (20) is arranged in communication with the internal combustionengine (2), the electric machine (6), the gearbox (8) and the energy storageunit (18), characterized by the steps of: - determining (s101) the energy level in the energy storage unit (18); - determining (s102) the acceleration ability with a subsequent gear; - determining (s103) a target engine speed for the internal combustion engine(2) based on the energy level in the energy storage unit (18) and theacceleration ability; and - controlling (s104) the gear shifting based on the target engine speed.
    [2] 2. The method according to claim 1, wherein the target engine speed isdetermined such that it is set to a first engine speed when the determinedenergy level is below a threshold level and/or the determined acceleration ability is below a threshold level.
    [3] 3. The method according to claim 2, wherein the target engine speed isdetermined such that it is set to a second engine speed when the determinedenergy level is above the threshold level and the determined accelerationability is above the threshold level, wherein the second engine speed is lower than the first engine speed.
    [4] 4. The method according to claim 3, wherein the second engine speed is determined based on the first engine speed.
    [5] 5. The method according to claim 4, wherein the second engine speed is determined as the first engine speed decreased with a predetermined factor. 21
    [6] 6. The method according to claim 5, wherein the predetermined factor depend on the determined energy level and the determined acceleration ability.
    [7] 7. The method according to claims 3-6, wherein the step of controlling (s104)the gear shifting includes controlling the electric machine (6) to provide torque when the second engine speed is set as the target engine speed.
    [8] 8. The method according to any of the preceding claims, wherein the methodfurther comprises the step of, prior to determining the target engine speed: - determining (s105) the functionality of the electric machine (6).
    [9] 9. A method according to any of the preceding claims, wherein theacceleration ability with the subsequent gear is determined based on thetractive force provided with the subsequent gear and the current drivingresistance.
    [10] 10. The method according to any of the preceding claims, wherein the target engine speed is determined based on a position of an accelerator pedal.
    [11] 11. A system (30) for gear shifting in a hybrid powertrain (3), wherein thepowertrain (3) comprises an internal combustion engine (2); an electricmachine (6); a gearbox (8); and an energy storage unit (18) connected to theelectric machine (6), and wherein at least one control unit (20) is arranged incommunication with the internal combustion engine (2), the electric machine(6), the gearbox (8) and the energy storage unit (18), characterized in thatthe control unit (20) is adapted to determine the energy level in the energystorage unit (18), determine the acceleration ability with the subsequent gear,determine a target engine speed for the internal combustion engine (2) basedon the energy level in the energy storage unit and the acceleration ability; andcontrol the gear shifting based on the target engine speed. 22
    [12] 12. The system according to claim 11, wherein the control unit (20) is adaptedto determine the target engine speed such that it is set to a first engine speedwhen the determined energy level is below a threshold level and/or thedetermined acceleration ability is below a threshold level.
    [13] 13. The system according to claim 12, wherein the control unit (20) is adaptedto determine the target engine speed such that it is set to a second enginespeed when the determined energy level is above the threshold level and thedetermined acceleration ability is above the threshold level, wherein the second engine speed is lower than the first engine speed.
    [14] 14. A vehicle, characterized in that it comprises a system (30) according toclaims 11-13.
    [15] 15. A computer program (P), wherein said computer program comprisesprogram code for causing an electronic control unit (20; 500) or a computer(22; 500) connected to the electronic control unit (20; 500) to perform the steps according to any of the claims 1-10.
    [16] 16. A computer program product comprising a program code stored on acomputer-readable medium for performing the method steps according to anyof claims 1-10, when said computer program is run on an electronic control unit(20; 500) or a computer (22; 500) connected to the electronic control unit (20;500).
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    同族专利:
    公开号 | 公开日
    KR20180085774A|2018-07-27|
    SE540521C2|2018-09-25|
    CN108473130A|2018-08-31|
    EP3383715A4|2019-09-04|
    US20180345782A1|2018-12-06|
    WO2017095308A1|2017-06-08|
    EP3383715A1|2018-10-10|
    BR112018011226A2|2018-11-21|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1551560A|SE540521C2|2015-12-01|2015-12-01|A method and system for gear shifting in a hybrid powertrain|SE1551560A| SE540521C2|2015-12-01|2015-12-01|A method and system for gear shifting in a hybrid powertrain|
    BR112018011226A| BR112018011226A2|2015-12-01|2016-11-29|Method and system for gear change in a hybrid power train|
    EP16871151.3A| EP3383715A4|2015-12-01|2016-11-29|A method and system for gear shifting in a hybrid powertrain|
    PCT/SE2016/051180| WO2017095308A1|2015-12-01|2016-11-29|A method and system for gear shifting in a hybrid powertrain|
    CN201680077487.0A| CN108473130A|2015-12-01|2016-11-29|Method and system for shifting gears in hybrid power system|
    KR1020187017731A| KR20180085774A|2015-12-01|2016-11-29|Method and system for gear shift in hybrid powertrain|
    US15/779,984| US20180345782A1|2015-12-01|2016-11-29|Method and system for gear shifting in a hybrid powertrain|
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