混合动力汽车发动机电机拖动策略与起动性能研究

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1、学兔兔www.xuetutu.com汽车工程2016年(第38卷)第2期AutomotiveEngineering2016(Vo1．38)No．22016022混合动力汽车发动机电机拖动策略和起动性能的研究冰李理光，李献菁，陆海峰’，邓俊(1．同济大学汽车学院，上海200092；2．同济大学中德学院，上海200092)[摘要]本文围绕ISG型混合动力汽车起动工况，研究了冷却水温和拖动转速对发动机起动阻力矩、电机电流特性和系统转速特性的影响。结果显示：冷却水温对电机拖动策略及起动性能有重要影响，当冷却水温低于约45clC时，发动机平均起动阻力矩随温度升高而明显降低

2、，且拖动转速的升高对平均起动阻力矩的影响较为明显；而当冷却水温高于约45~C后平均起动阻力矩变化平缓；从降低阻力矩的角度出发，应采用低速起动。转矩控制模式下，热机和低速起动时，起动瞬间电机电流出现较大畸变，适当提高拖动转速或降低起动转矩有利于减小起动瞬间的冲击电流；转速控制模式下，起动瞬间产生更大的冲击电流，提高拖动转速有利于减小起动初期电机电流的突变。为实现快速起动，应根据冷却水温确定电机的起动控制策略，冷却水温高于约45％时，采用转矩控制模式，低于约45oc时，采用转速控制模式。关键词：混合动力汽车；快速起动；拖动策略；电流特性AStudyontheMoto

3、rCrankingStrategyandStartPerformanceofaHEVEngineLiLiguang，LiXianjing．LuHaifeng&DengJun1．SchoolofAutomotiveStudies，7"o,~aiiUniversity，Shanghai200092；2．CDHK，TongjiUniversity，Shanghai200092[Abstract]Inthispaper，theeffectsofcoolanttemperatureandcrankingspeedO13thestartingresistancemoment

4、ofengine，thecurrentcharacteristicsofelectricmotorandthespeedcharacteristicsofsystemforanISGhy—bridelectricvehicleunderstartingconditionarestudied．Theresultsindicatethatthecoolanttemperaturehasanimportanteffectonthemotorcrankingstrategyandstartingperformance．Whencoolanttemperatureisbe

5、lowaround45~C，theaveragestartingresistancemomentsignificantlyreduceswiththeriseofcoolanttemperature，andobvious-lydecreaseswiththefallincrankingspeed，andwhenthecoolanttemperatureishigherthanaround45℃，theav—eragestartingresistancemomenttendstobestable．Fromapointofviewofreducingresistan

6、cemoment，lowspeedstartingshouldbeadopted．Undertorquecontrolmode，thetransientcurrentofmotorshowsalargerdistortioninlow-speedandhotstart，butthereasonablyincreasingcrankingspeedordecreasingstartingtorqueareconducivetothereductionoftransientstartingcurrentsurges；whileunderspeedcontrolmod

7、e，largercrentsurgeappearsinstartinginstant，andtheincreaseofcrankingspeedhelpsreducetheabruptchangeofmotorcurentintheinitiatephaseofstarting．Forachievingquickstart，thestartingcontrolstrategyofmotorshouldbedeterminedaccordingtocoolanttemperature：torquecontrolmodeshouldbeadoptedwhencool

8、anttemperatu