JP6197479B2 - 蓄電システム及び蓄電装置の満充電容量推定方法 - Google Patents
蓄電システム及び蓄電装置の満充電容量推定方法 Download PDFInfo
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Description
ここで、コントローラは、満充電容量が推定されていない期間が所定期間を超える場合に、推定処理を遂行することができ、前回満充電容量に応じて所定期間を変更することができる。このように構成することで、満充電容量が推定されていない期間がトリガーとなって任意のタイミングで満充電容量を推定することができ、満充電容量が推定されていない期間が長くなること、言い換えれば、経年変化する満充電容量を把握できない期間が長くなることを抑制することができる。また、満充電容量が大きい状態ではその低下量が多くなるので、例えば、満充電容量が大きいほど満充電容量が推定されていない期間の許容期間である所定期間を小さく(短く)し、満充電容量の推定頻度を増やして満充電容量の変化を正確に把握できるようにすることができる。
また、コントローラは、前回満充電容量の大きさが小さくなるにつれて上記所定期間を長く設定するとともに、前回満充電容量の大きさが所定の閾値よりも小さい領域では上記所定期間が一定となるように設定することができる。
(式1)
満充電容量=電流積算値(ΣI)÷(SOC_e−SOC_s)×100
Claims (6)
- 車両に搭載される蓄電システムであって、
充放電を行う蓄電装置と、
前記蓄電装置の経過期間に応じて予め規定された初期満充電容量からの低下率に基づいて、現在の満充電容量を算出する推定処理を遂行するコントローラと、を有し、
前記コントローラは、
前回満充電容量が算出されたときから現在まで満充電容量が推定されていない期間の平均SOC及び平均電池温度と、前記平均SOC及び平均電池温度に応じて変化する前記低下率が予め規定された低下率マップとを用いて、前記満充電容量が推定されていない期間中の低下率を算出し、前記満充電容量が推定されていない期間中の低下率と前記初期満充電容量とに基づいて前回満充電容量が算出されたときの前記蓄電装置の第1経過期間を算出し、
前記第1経過期間と前記満充電容量が推定されていない期間とから算出される前記蓄電装置の現在の第2経過期間、前記満充電容量が推定されていない期間中の低下率、及び前記初期満充電容量に基づいて、現在の満充電容量を算出し、
前記コントローラは、前記満充電容量が推定されていない期間が所定期間を超える場合に、前記推定処理を遂行すると共に、前回満充電容量の大きさに応じて前記所定期間を変更可能に制御し、
前回満充電容量の大きさが大きい程、前記所定期間を短く設定し、前回満充電容量の大きさが小さくなるにつれて前記所定期間を長く設定することを特徴とする蓄電システム。 - 前記コントローラは、前回満充電容量の大きさが小さくなるにつれて前記所定期間を長く設定するとともに、前回満充電容量の大きさが所定の閾値よりも小さい領域では前記所定期間が一定となるように設定することを特徴とする請求項1に記載の蓄電システム。
- 前記コントローラは、外部電源から供給される電力が前記蓄電装置に充電される外部充電前後のSOC差と外部充電中の充電電流積算値とに基づいて前記蓄電装置の満充電容量を算出する第1推定処理を遂行し、
前記第1推定処理によって推定された満充電容量を前回満充電容量として、外部充電の際に満充電容量が算出されたときから現在までの前記満充電容量が推定されていない期間中に前記推定処理を遂行することを特徴とする請求項1又は2に記載の蓄電システム。 - 前記コントローラは、車両走行中又は車両停車中にかかわらずに、前記満充電容量が推定されていない期間中の蓄電装置のSOC及び電池温度を所定のタイミングで複数取得し、前記満充電容量が推定されていない期間の経過時間と共に所定の記憶領域に記憶することを特徴とする請求項1から3のいずれか1つに記載の蓄電システム。
- 前記低下率マップは、前記平均SOC及び平均電池温度が高いほど、前記低下率が大きくなるように設定されていることを特徴とする請求項1から4のいずれか1つに記載の蓄電システム。
- 車両に搭載される蓄電装置の経過期間に応じて予め規定された初期満充電容量からの低下率に基づいて、現在の満充電容量を算出する満充電容量推定方法であって、
前回満充電容量が算出されたときから現在まで満充電容量が推定されていない期間の平均SOC及び平均電池温度を算出するステップと、
前記平均SOC及び平均電池温度に応じて変化する前記低下率が予め規定された低下率マップを用いて、前記満充電容量が推定されていない期間中の低下率を算出するステップと、
前記満充電容量が推定されていない期間中の低下率と前記初期満充電容量とに基づいて前回満充電容量が算出されたときの前記蓄電装置の第1経過期間を算出するステップと、
前記第1経過期間と前記満充電容量が推定されていない期間とから算出される前記蓄電装置の現在の第2経過期間、前記満充電容量が推定されていない期間中の低下率、及び前記初期満充電容量に基づいて、現在の満充電容量を算出するステップと、を含み、
前記満充電容量が推定されていない期間が所定期間を超える場合に前記各ステップに基づく推定処理を遂行するように制御されるとともに、前記所定期間は、前回満充電容量の大きさに応じて変更可能であり、
前回満充電容量の大きさが大きい程、前記所定期間を短く設定し、前回満充電容量の大きさが小さくなるにつれて前記所定期間を長く設定するステップをさらに含むことを特徴とする満充電容量推定方法。
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