JP2012029455A - 車両の制御装置および制御方法 - Google Patents
車両の制御装置および制御方法 Download PDFInfo
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Abstract
【解決手段】制御回路100は、外部電源を用いて充電可能なバッテリを備えた車両に搭載される。制御回路100は、走行制御部110、外部充電制御部120を含む。走行制御部110は、走行制御中、バッテリの満充電容量FCCに対する実際の蓄電量の割合であるSOCがαからβまでの走行制御域内に収まるようにバッテリの充放電を制御する。外部充電制御部120は、外部電源が車両に接続された場合、SOCがSOCs(<α)に低下してから充電を開始し、SOCがSOCe(>β)に達した時点で充電を終了させる拡大充電を行なう。算出部124は、拡大充電中のSOC変動量ΔSOC2に対するSOC最大値の比を拡大充電中の電流積算値∫Iinに乗じた値を満充電容量FCCとして算出する。
【選択図】図2
Description
MG41は、加速時等のエンジン始動要求時において、エンジン50を始動する始動機として用いられる。このとき、MG41は、PCU30を介してバッテリ10からの電力供給を受けて電動機として駆動し、エンジン50をクランキングして始動する。さらに、エンジン50の始動後において、MG41は、動力分割機構60を介して伝達されたエンジン出力によって回転されて発電可能である。
DC/DCコンバータ91は、PCU30に対して並列にバッテリ10に接続され、制御回路100からの制御信号S3に基づいて、バッテリ10から供給される直流電圧を降圧する。降圧された電力は補機92に供給される。なお、補機92には、たとえばランプ類、ワイパー、ヒータ、オーディオ、空調装置などの負荷や、バッテリ10の両端電圧よりも低い電圧(たとえば12V程度)を出力する補機バッテリなどが含まれる。
走行制御部110は、走行制御中、式(1)で算出したSOCが次式(2)を満足するようにPCU30を制御する。
なお、走行制御中のSOCをαからβまでの走行制御域内に制限するのは、バッテリ10の劣化を防止するためである。すなわち、走行制御中においては、高いレートでバッテリ10の充放電が行なわれるが、このような高いレートの充放電がSOC<αの領域あるいはSOC>βの領域で行なわれると、バッテリ10が劣化してしまうおそれがある。このような劣化を防止するために、走行制御中のSOCをαからβまでの値に制限している。
FCC={100/ΔSOC2}×∫Iin ・・・(4)
すなわち、算出部124は、ΔSOC2に対するSOC最大値の比(=100/ΔSOC2)を積算値∫Iinに乗じることによって、SOC最大値に対応する電荷量、すなわち満充電容量FCCを推定する。
走行制御部110は、トリップ毎に、記憶部140に記載された満充電容量FCCを読み出し、読み出した満充電容量FCCを用いて走行制御中のSOCを算出する(上述の式(1)参照)。
S25にて、制御回路100は、満充電容量FCCの算出処理を行なう。なお、本処理の詳細は、図5を用いて説明する。
図5は、図4のS25の処理(満充電容量FCCの算出処理)の詳細な手順を示すフロチャートである。
Claims (8)
- 電池と、負荷と、前記電池および前記負荷の間で授受される電力を制御する電力制御器と、車両外部の電源を用いて前記電池を充電する外部充電を行なう充電器とを備えた車両の制御装置であって、
前記車両の走行制御中である場合に、前記電池の満充電容量に対する実蓄電量の割合であるSOCが所定領域内に収まるように前記電力制御器を制御する第1制御部と、
前記電源が前記車両に接続された場合に、前記外部充電中の前記SOCの変動量が前記所定領域の幅よりも大きい拡大充電を行なうように前記電力制御器および前記充電器を制御する第2制御部と、
前記拡大充電中の前記SOCの変動量に対する前記SOCの最大値の比を前記拡大充電中に前記電池に流れ込んだ電流の積算値に乗じた値を、前記満充電容量として算出する算出部とを備える、車両の制御装置。 - 前記第2制御部は、前記電源が前記車両に接続された場合、前記SOCが前記所定領域の下限値よりも低い第1領域に含まれる第1SOCに低下するまで前記電池から放電させる第1放電を行ない、前記第1放電の終了後に前記拡大充電を開始し、前記SOCが前記所定領域の上限値よりも高い第2領域に含まれる第2SOCに達した時点で前記拡大充電を終了する、請求項1に記載の車両の制御装置。
- 前記第2制御部は、前記拡大充電の終了後、前記SOCが前記所定領域内に収まるように前記電池から放電させる第2放電を行なう、請求項2に記載の車両の制御装置。
- 前記電池は、前記第1、第2領域における前記電池の電圧の単位変動量に対する前記SOCの変動量が前記所定領域における前記電池の電圧の単位変動量に対する前記SOCの電圧の変動量よりも小さくなる特性を有し、
前記制御装置は、前記電池の電圧を検出する電圧センサをさらに備え、
前記算出部は、前記拡大充電の開始時の前記電圧センサの出力に基づいて前記拡大充電の開始時のSOCを算出し、前記拡大充電の終了時の前記電圧センサの出力に基づいて前記拡大充電の終了時のSOCを算出し、算出した2つのSOCの差を前記拡大充電中の前記SOCの変動量として算出する、請求項2に記載の車両の制御装置。 - 前記第2制御部は、前記第1放電の終了後かつ前記拡大充電の開始前の第1期間に前記電池に電流が流れていない状態を形成するとともに、前記拡大充電の終了後かつ前記第2放電の開始前の第2期間に前記電池に電流が流れていない状態を形成し、
前記制御装置は、前記電池に電流が流れていない状態での前記電池の電圧と前記SOCとの対応関係を予め記憶する関係記憶部をさらに備え、
前記算出部は、前記第1期間における前記電圧センサの出力に対応するSOCを前記対応関係を用いて算出した値を前記拡大充電の開始時のSOCとし、前記第2期間における前記電圧センサの出力に対応するSOCを前記対応関係を用いて算出した値を前記拡大充電の終了時のSOCとして、前記拡大充電中の前記SOCの変動量を算出する、請求項4に記載の車両の制御装置。 - 前記第2制御部は、前記電源が前記車両に接続された場合、前記車両の使用履歴に基づいて前記拡大充電の実行の可否を判断し、実行可と判断した場合に前記拡大充電を実行し、実行否と判断した場合には前記SOCが前記所定領域の上限値に達した時点で前記外部充電を終了する通常充電を実行する、請求項1に記載の車両の制御装置。
- 前記制御装置は、前記算出部が算出した前記満充電容量を記憶する容量記憶部をさらに備え、
前記第1制御部は、前記容量記憶部に記憶された前記満充電容量を用いて、前記走行制御中の前記SOCを算出する、請求項1に記載の車両の制御装置。 - 電池と、負荷と、前記電池および前記負荷の間で授受される電力を制御する電力制御器と、車両外部の電源を用いて前記電池を充電する外部充電を行なう充電器とを備えた車両の制御装置が行なう制御方法であって、
前記車両の走行制御中である場合に、前記電池の満充電容量に対する実蓄電量の割合であるSOCが所定領域内に収まるように前記電力制御器を制御するステップと、
前記電源が前記車両に接続された場合に、前記外部充電中の前記SOCの変動量が前記所定領域の幅よりも大きい拡大充電を行なうように前記電力制御器および前記充電器を制御するステップと、
前記拡大充電中の前記SOCの変動量に対する前記SOCの最大値の比を前記拡大充電中に前記電池に流れ込んだ電荷量に乗じた値を、前記満充電容量として算出するステップとを含む、車両の制御方法。
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