JPWO2010143277A1 - 電動車両の電源システムおよびその制御方法 - Google Patents
電動車両の電源システムおよびその制御方法 Download PDFInfo
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Abstract
Description
制御装置30は、これらの測定値に基づいて、SOC(State of Charge)に代表されるバッテリBAの状態を監視する。
図2を参照して、インバータ14は、U相アーム15と、V相アーム16と、W相アーム17とを含む。U相アーム15、V相アーム16、およびW相アーム17は、給電ラインPL2と接地ラインSL2との間に並列に接続される。
図3を参照して、コンバータ12Aは、一方端が電源ラインPL1Aに接続されるリアクトルL1と、給電ラインPL2と接地ラインSL2との間に直列に接続されるIGBT素子Q1,Q2と、それぞれの逆並列ダイオードD1,D2とを含む。
なお、昇圧時および降圧時には、一定のスイッチング周波数に従って、IGBT素子Q1,Q2をスイッチング制御(オンオフ制御)することによる電力損失が発生する。これに対して、電圧固定時(上アーム素子オン固定)には、IGBT素子のオンオフによる電力損失が発生しないので、コンバータの効率、ひいては、電動車両1の燃費が相対的に向上する。
Claims (10)
- 車両駆動パワーを発生するモータ(MG2)を搭載した電動車両(1)の電源システムであって、
主蓄電装置(BA)と、
前記モータを駆動制御するインバータ(14)に給電を行なう給電ライン(PL2)と、
前記給電ラインと前記主蓄電装置との間に設けられ、双方向の電圧変換を行なうように構成された第1の電圧変換器(12A)と、
互いに並列に設けられた複数の副蓄電装置(BB1,BB2)と、
前記複数の副蓄電装置と前記給電ラインとの間に設けられ、前記複数の副蓄電装置のうちの1つと前記給電ラインの間で双方向の電圧変換を行なうように構成された第2の電圧変換器(12B)と、
前記複数の副蓄電装置と前記第2の電圧変換器との間に設けられ、前記複数の副蓄電装置と前記第2の電圧変換器との間の接続および切離を制御するように構成された接続部(39B)と、
第1のモードでは、前記複数の副蓄電装置のうちの、順次選択された選択副蓄電装置(BB)と前記第2の電圧変換器との間を接続するとともに残りの副蓄電装置と前記第2の電圧変換器との間を切離す一方で、第2のモードでは、前記複数の副蓄電装置の各々を前記前記第2の電圧変換器と切離すように前記接続部を制御するための制御装置(30)とを備え、
前記制御装置は、
前記第1のモードにおいて現在の前記選択蓄電装置と交換可能な副蓄電装置が残っていない場合に、前記選択副蓄電装置の残存容量(SOC)が予め設定された第1の判定値(TH1)よりも低い第1の状態であることを検知するように構成された第1の判定部(101)と、
前記第1の判定部によって前記第1の状態が検知されたときに、前記電動車両の全体要求パワーへの対応性に関連する車両状態に応じて、前記第1のモードから前記第2のモードへの移行を指示する切離要求を発生するように構成された第2の判定部(102,106,107)と、
前記第1のモードにおいて現在の前記選択蓄電装置の他に使用可能な副蓄電装置が残っていない場合に、前記選択副蓄電装置の残存容量が、前記第1の判定値より低い第2の判定値(TH2)よりも低下した第2の状態が検知されたときに、前記車両状態にかかわらず前記切離要求を発生するように構成された第3の判定部(103,107)とを含む、電動車両の電源システム。 - 前記第2の判定部(102)は、前記第1の判定部(101)によって前記第1の状態が検知されたときに、前記電動車両(1)の全体要求パワー(Pttl)が判定値よりも低いと、前記切離要求を発生するように構成される、請求の範囲第1項に記載の電動車両の電源システム。
- 前記判定値は、前記主蓄電装置(BA)の出力電力上限値(Wout(M))に基づいて可変に設定される、請求の範囲第2項に記載の電動車両の電源システム。
- 前記電動車両(1)は、
前記モータ(MG2)とは独立に車両駆動パワーを出力可能に構成された内燃機関(4)と、
前記電動車両の全体要求パワー(Pttl)を、前記モータの出力パワーと、前記内燃機関の出力パワーとに分配する走行制御部(250)とをさらに備え、
前記第2の判定部(102)は、前記第1の判定部(101)によって前記第1の状態が検知されたときに、前記内燃機関が作動中であると前記切離要求を発生するように構成される、請求の範囲第1項に記載の電動車両の電源システム。 - 前記制御装置は、
前記切離要求が発生されたときに、前記給電ラインの電圧(VH)を、少なくとも前記主蓄電装置および前記複数の副主蓄電装置の各出力電圧よりも高い第1の電圧(V1)とするように前記第1の電圧変換器に指示するように構成された昇圧指示部(110)と、
前記給電ラインの電圧が前記第1の電圧に達した後に、前記選択副蓄電装置による入出力電力上限値(Win(S),Wout(S))を徐々に零まで減少させるように構成された電力制限部(120)と、
前記電力制限部によって前記入出力電力上限値が零に設定されたときに、前記接続部に対して、前記選択副蓄電装置を前記第2の電圧変換器から切離すとともに、前記残りの副蓄電装置と前記第2の電圧変換器との間の切離状態を維持するように指示する切離制御部(140)と、
前記切離制御部によって各前記副蓄電装置が前記第2の電圧変換器から切離された後に、前記給電ラインの電圧制御範囲の下限値を、前記第1のモードにおける当該下限値よりも低下させて前記主蓄電装置の出力電圧に設定するように構成された昇圧停止許可部(160)とをさらに含む、請求の範囲第1〜4項のいずれか1項に記載の電動車両の電源システム。 - 車両駆動パワーを発生するモータ(MG2)を搭載した電動車両(1)の電源システムの制御方法であって、
前記電源システムは、
主蓄電装置(BA)と、
前記モータを駆動制御するインバータ(14)に給電を行なう給電ライン(PL2)と、
前記給電ラインと前記主蓄電装置との間に設けられ、双方向の電圧変換を行なうように構成された第1の電圧変換器(12A)と、
互いに並列に設けられた複数の副蓄電装置(BB1,BB2)と、
前記複数の副蓄電装置と前記給電ラインとの間に設けられ、前記複数の副蓄電装置のうちの1つと前記給電ラインの間で双方向の電圧変換を行なうように構成された第2の電圧変換器(12B)と、
前記複数の副蓄電装置と前記第2の電圧変換器との間に設けられ、前記複数の副蓄電装置と前記第2の電圧変換器との間の接続および切離を制御するように構成された接続部(39B)と、
第1のモードでは、前記複数の副蓄電装置のうちの、順次選択された選択副蓄電装置(BB)と前記第2の電圧変換器との間を接続するとともに残りの副蓄電装置と前記第2の電圧変換器との間を切離す一方で、第2のモードでは、前記複数の副蓄電装置の各々を前記前記第2の電圧変換器と切離すように前記接続部を制御するための制御装置(30)とを備え、
前記制御方法は、
前記第1のモードにおいて現在の前記選択蓄電装置と交換可能な副蓄電装置が残っていない場合に、前記選択副蓄電装置の残存容量(SOC)が予め設定された第1の判定値(TH1)よりも低い第1の状態であることを検知するステップ(S110、S120)と、
前記検知するステップによって前記第1の状態が検知されたときに、前記電動車両の全体要求パワーへの対応性に関連する車両状態に応じて、前記第1のモードから前記第2のモードへの移行を指示する切離要求を発生するステップ(S130)と、
前記第1のモードにおいて現在の前記選択蓄電装置の他に使用可能な副蓄電装置が残っていない場合に、前記選択副蓄電装置の残存容量が、前記第1の判定値より低い第2の判定値(TH2)よりも低下した第2の状態が検知されたときに、前記車両状態にかかわらず前記切離要求を発生するステップ(S140)とを備える、電動車両の電源システムの制御方法。 - 前記切離要求を発生するステップ(S130)は、前記検知するステップ(S120)によって前記第1の状態が検知されたときに、前記電動車両(1)の全体要求パワー(Pttl)が判定値よりも低いと前記切離要求を発生する、請求の範囲第6項に記載の電動車両の電源システムの制御方法。
- 前記判定値は、前記主蓄電装置(BA)の出力電力上限値(Wout(M))に基づいて可変に設定される、請求の範囲第7項に記載の電動車両の電源システムの制御方法。
- 前記電動車両(1)は、前記モータ(MG2)とは独立に車両駆動パワーを出力可能に構成された内燃機関(4)をさらに搭載し、
前記切離要求を発生するステップ(S130)は、前記検知するステップ(S120)によって前記第1の状態が検知されたときに、前記内燃機関が作動中であると前記切離要求を発生する、請求の範囲第6項に記載の電動車両の電源システムの制御方法。 - 前記切離要求が発生されたときに、前記給電ラインの電圧(VH)を、少なくとも前記主蓄電装置および前記複数の副主蓄電装置の各出力電圧よりも高い第1の電圧(V1)とするように前記第1の電圧変換器に指示するステップ(S200)と、
前記給電ラインの電圧が前記第1の電圧に達した後に、前記選択副蓄電装置による入出力電力上限値(Win(S),Wout(S))を徐々に零まで減少させるステップ(S320,S330)と、
前記減少させるステップによって前記入出力電力上限値が零に設定されたときに、前記接続部に対して、前記選択副蓄電装置を前記第2の電圧変換器から切離すとともに、前記残りの副蓄電装置と前記第2の電圧変換器との間の切離状態を維持するように指示するステップ(S420)と、
前記指示するステップによって各前記副蓄電装置が前記第2の電圧変換器から切離された後に、前記給電ラインの電圧制御範囲の下限値を、前記第1のモードにおける当該下限値よりも低下させて前記主蓄電装置の出力電圧に設定するステップ(S560)とをさらに備える、請求の範囲第6〜9項のいずれか1項に記載の電動車両の電源システムの制御方法。
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