JP6229539B2 - 車両のバッテリ制御装置 - Google Patents
車両のバッテリ制御装置 Download PDFInfo
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Description
すなわち、前記バッテリが低温であるときに前記外部電源を用いて前記バッテリを充電する際には、その充電前に前記降圧器を駆動し、引き続き前記充電器を駆動することが好ましい。その後、前記バッテリが暖まったら、前記外部電源から供給される電力で前記バッテリを充電することが好ましい。
例えば、前記バッテリの放電電流が正の所定値以上となるように、前記充電器の出力電流及び出力電圧を制御することが好ましい。
例えば、前記放電電流の大きさを、前記充電器における出力電流の変化量よりも大きな値とすることが好ましい。
上記の所定時間は、例えば前記降圧器の動作が安定するのに要する時間に基づいて設定されることが好ましい。
本実施形態のバッテリ制御装置は、図1に示す車両10に適用される。この車両10はバッテリ2の電力で走行用モータを駆動する電気自動車又はハイブリッド自動車であり、バッテリ2が内蔵された電池パック1を搭載する。バッテリ2は、走行用モータで発生する回生電力での充電だけでなく、外部電源を利用した充電が可能である。例えば、充電ケーブル9の一端に設けられる充電ガン9Aを車体側面のコネクタに接続し、他端を家庭用コンセント16に接続することで、バッテリ2の充電が開始される。外部電源から入力される交流電力は、OBC7(On Board Charger,充電器)で直流電力に変換されてバッテリ2に蓄電される。
また、DCDC6の作動時であって、低圧回路11上の各種電装品が負荷として作用する状態では、高圧回路5側の電力が低圧回路11側で消費される。このときバッテリ2が充電中であれば、低圧回路11での消費電力は、外部から入力された外部電源から供給される電力(外部電力)からバッテリ2の充電電力を減じたものに相当する。一方、バッテリ2が放電中であれば、低圧回路11の消費電力は、OBC7を経由して外部電源から供給される外部電力とバッテリ2の放電電力とを加算したものに相当する。電子制御装置8は、このような特性を踏まえて、OBC7の出力の大きさを増減制御することで、低圧回路11上の各種電装品を動作させつつ、バッテリ2の充放電状態も同時に制御する。
電子制御装置8(バッテリ制御装置)は、バッテリ2の充放電に係る各種制御を司るコンピュータであり、例えばマイクロプロセッサやROM,RAM等を集積したLSIデバイスや組み込み電子デバイスである。ここでは、バッテリ2に関する各種制御が実施され、バッテリ2の充電状態,バッテリ温度,高圧回路5の電流値,電圧値等が把握される。本実施形態では、極低温環境下でバッテリ2を外部充電する際に実施されるバッテリ昇温制御について説明する。
バッテリ昇温制御では、外部電力,バッテリ電力の両方を使用して電気ヒータ4が駆動される。つまり、バッテリ2のバッファ効果を考慮して、バッテリ昇温制御の実施中はコンタクタ3の接続状態が維持される。また、極低温環境での充電による電池劣化を回避すべく、バッテリ2が常に放電状態となるように、高圧回路5の電圧が制御される。
OBC7の起動開始のタイミングは、少なくともDCDC6を所定時間作動させた後とされる。ここでいう所定時間は、DCDC6の動作が安定化するのに要する時間であり、例えば数秒〜数十秒である。
なお、バッテリ温度が所定温度以上であるとき、充電器制御部8Bは外部電力でバッテリ2を充電する普通充電制御を実施する。
ステップA8では、バッテリ2の放電電流が所定値以下になったか否かが判定され、この条件が成立した時点で電気ヒータ4の駆動電力の負担割合が固定される。これにより、バッテリ2の放電電流が維持されるとともに、OBC7の出力も維持される(ステップA9)。その後、バッテリ温度が所定温度以上になると(ステップA10)、ヒータスイッチ17が切断されてバッテリ2の普通充電制御が開始される(ステップA11)。
OBC7の出力は、電気ヒータ4に供給される電力がバッテリ電力から外部電力へと徐々に切り換えられるように制御される。例えば、時刻t3の時点ではOBC7の出力電流値がゼロであり、時間が経過するに連れて徐々に増加する。このとき、OBC7の出力電圧はバッテリ2の電圧よりも低圧とされる。このような電力負担の漸次的な変更により、バッテリ2の放電電流が緩慢に減少する。
例えば、図4(F)中に太実線で示す放電電流の目標値に対して、細実線で示す実電流値は、目標値を中心として上下に変化(振動)する。しかし、上記のバッテリ昇温制御では所定値B1が放電電流の目標値の下限となるため、バッテリ2の実電流値がゼロを下回ることはなく、常にバッテリ2の放電状態が維持される。
(1)上記のバッテリ昇温制御では、電気ヒータ4に供給される電力をバッテリ電力から外部電力へと徐々に変化させるバッテリ昇温制御が実施される。これにより、微小な電圧変動によって外部電力がバッテリ2側に充電されてしまうことを防止でき、バッテリ2の保護性を向上させることができる。つまり、バッテリ温度を昇温させつつ、充電による内部短絡のリスク発生を回避でき、バッテリ保護性を向上させることができる。
また、電気ヒータ4に供給される電力をバッテリ電力から外部電力へと徐々に変化させることで、バッテリ電力の過度な消費を避けつつ、外部電力でバッテリ2を昇温させることができる。つまり、バッテリ2の早期昇温をはかることができ、延いては低温環境化での適切なバッテリ暖機,充電を行うことができる。さらに、バッテリ2のバッファ効果を利用して高圧回路5内の電圧変動を吸収することができ、DCDC6,OBC7の保護性を向上させることができる。
一方、バッテリ2が十分に暖まっていない状態では、バッテリ2を暖めるための電力をバッテリ2自身と外部電力との両方から調達することで、電気ヒータ4を確実に作動させつつバッテリ2の放電に由来するジュール熱を利用した昇温を図ることができ、バッテリ2が充電可能となるまでの時間を短縮することができる。また、図4(B)に示すように、バッテリ昇温制御中にコンタクタ3が切断されないため、バッテリ2のバッファ効果を利用してDCDC6,OBC7の動作を安定させることができる。
上記のバッテリ昇温制御では、図4(E),(F)に示すように、OBC7の出力電流値やバッテリ2の放電電流値が一定の勾配で変化するものを例示したが、これらの具体的な変化のさせ方はこれに限定されない。少なくとも、電気ヒータ4での消費電力に占めるバッテリ電力の割合が漸減するように、電気ヒータ4への電力を徐々に変化させればよい。
4 電気ヒータ(加熱器)
6 DCDC(降圧器,DC/DCコンバータ)
7 OBC(充電器)
8 電子制御装置(バッテリ制御装置)
8A 降圧器制御部
8B 充電器制御部
10 車両
Claims (5)
- 車載のバッテリを外部電源から供給される電力で充電する充電器と、前記バッテリを昇温させる加熱器と、バッテリ電力を降圧して前記加熱器に供給する降圧器とを具備する車両のバッテリ制御装置において、
前記バッテリを前記充電器で充電する前に前記降圧器を駆動し、前記バッテリ電力を前記加熱器に供給する降圧器制御部と、
前記降圧器の作動後に前記充電器を駆動し、前記加熱器に供給される電力を前記バッテリ電力から前記外部電源の電力へと徐々に変化させる充電器制御部と、
を備えたことを特徴とする、車両のバッテリ制御装置。 - 前記降圧器制御部は、バッテリ温度が所定温度未満のときに、前記降圧器を駆動して前記バッテリ電力を前記加熱器に供給する
を備えたことを特徴とする、請求項1記載の車両のバッテリ制御装置。 - 前記充電器制御部が、前記バッテリの放電状態を維持しつつ前記外部電源から供給される電力で前記加熱器を作動させる
ことを特徴とする、請求項1又は2記載の車両のバッテリ制御装置。 - 前記充電器制御部は、前記バッテリの放電状態における放電電流の大きさを、少なくとも前記充電器における出力電流の変動を吸収する大きさに制御する
ことを特徴とする、請求項3記載の車両のバッテリ制御装置。 - 前記充電器制御部は、前記降圧器制御部が前記降圧器を所定時間作動させた後に、前記バッテリ電力から前記外部電源の電力への切り換えを開始する
ことを特徴とする、請求項1〜4の何れか1項に記載の車両のバッテリ制御装置。
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