JP5141772B2 - 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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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。
なお、バッテリBA,BB1,BB2としては、たとえば、鉛蓄電池、ニッケル水素電池、リチウムイオン電池等の二次電池や、電気二重層コンデンサ等の大容量キャパシタなどを用いることができる。
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。
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のうちの選択副蓄電装置(BB)を選択的に前記第2の電圧変換器と接続するように構成された接続部(39B)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の選択的な接続を制御するように構成された切換制御装置(30)とを備え、
前記切換制御装置は、
使用中の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)よりも低下したか否かを検出するように構成された第1の判定部(101)と、
前記残存容量が前記第1の判定値よりも低下したときに、前記電動車両の車両状態に応じて、前記選択副蓄電装置の切換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)よりも低下したときに、前記車両状態にかかわらず前記切換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、前記残存容量(SOC)が前記第1の判定値(TH1)よりも低下したときに、前記電動車両(1)のトータル要求パワー(Pttl)が、前記主蓄電装置(BA)の出力電力上限値(Wout(M))に基づいて設定された判定値よりも低いと、前記切換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、前記残存容量(SOC)が前記第1の判定値(TH1)よりも低下したときに、前記内燃機関が作動中であると前記切換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。 - 前記切換制御装置は、
前記複数の副蓄電装置(BB1,BB2)のうちの前記選択副蓄電装置(BB)を除く予備蓄電装置の各々の充電容量が所定値よりも低いときに、前記切換要求の発生を禁止するように構成された予備蓄電装置判定部(105)をさらに含む、請求の範囲第1項に記載の電動車両の電源システム。 - 前記切換制御装置は、
前記切換要求が発生されたときに、前記給電ラインの電圧(VH)を、前記主蓄電装置の出力電圧および切換後に前記第2の電圧変換器と接続される副蓄電装置の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第1の電力制限部(120)と、
前記第1の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、前記複数の副蓄電装置および前記第2の電圧変換器の間の接続を切換えるように構成された接続切換制御部(140)と、
前記接続切換制御部によって前記複数の副蓄電装置および前記第2の電圧変換器の間の接続が切換えられた後に、前記第2の電力変換器と新たに接続された副蓄電装置の充電状態に対応する値まで、前記入出力電力上限値を徐々に上昇させるように構成された第2の電力制限部(120)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のうちの選択副蓄電装置(BB)を選択的に前記第2の電圧変換器と接続するように構成された接続部(39B)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の選択的な接続を制御するように構成された切換制御装置(30)とを備え、
前記制御方法は、
使用中の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)よりも低下したか否かを判定するステップ(S120)と、
前記残存容量が前記第1の判定値よりも低下したときに、前記電動車両の車両状態に応じて、前記選択副蓄電装置の切換要求を発生するステップ(S130)と、
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)よりも低下したときに、前記車両状態にかかわらず前記切換要求を強制的に発生するステップ(S140)とを備える、電動車両の電源システムの制御方法。 - 前記切換要求を発生するステップ(S130)は、前記残存容量(SOC)が前記第1の判定値(TH1)よりも低下したときに、前記電動車両(1)のトータル要求パワー(Pttl)が、前記主蓄電装置(BA)の出力電力上限値(Wout(M))に基づいて設定された判定値よりも低いと、前記切換要求を発生する、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、
前記切換要求を発生するステップ(S130)は、前記残存容量(SOC)が前記第1の判定値(TH1)よりも低下したときに、前記内燃機関が作動中であると前記切換要求を発生する、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。 - 前記複数の副蓄電装置(BB1,BB2)のうちの前記選択副蓄電装置(BB)を除く予備蓄電装置の各々の充電容量が所定値よりも低いときに、前記切換要求の発生を禁止するステップ(S110)をさらに備える、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。
- 前記切換要求が発生されたときに、前記給電ラインの電圧(VH)を、前記主蓄電装置の出力電圧および切換後に前記第2の電圧変換器と接続される副蓄電装置の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〜S340)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を切換えるステップ(S400)と、
前記切換えるステップによって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が切換えられた後に、前記第2の電力変換器と新たに接続された副蓄電装置の充電状態に対応する値まで、前記入出力電力上限値を徐々に上昇させるステップ(S520〜S540)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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