JP2011091899A - 電動車両 - Google Patents
電動車両 Download PDFInfo
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- JP2011091899A JP2011091899A JP2009241566A JP2009241566A JP2011091899A JP 2011091899 A JP2011091899 A JP 2011091899A JP 2009241566 A JP2009241566 A JP 2009241566A JP 2009241566 A JP2009241566 A JP 2009241566A JP 2011091899 A JP2011091899 A JP 2011091899A
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Abstract
【解決手段】電動車両は、複数の単位セル76それぞれに並列に接続された放電抵抗78により複数の単位セル76のうち少なくとも1つの蓄電電力を放電させて複数の単位セル76の蓄電量を均等化する均等化回路62と、電動車両の駐車時期を予測する駐車時期予測手段と、前記駐車時期予測手段により予測された駐車時期に応じて、蓄電装置60の蓄電電力を均等化回路62により放電させて蓄電装置60の蓄電電力を低下させる蓄電電力制御手段とを備える。
【選択図】図2
Description
1.電動車両10の構成
(1)全体構成
図1は、この発明の第1実施形態に係る電動車両10の回路図である。電動車両10は、電力システム12と、モータユニット14とを有する。電力システム12は、FCユニット16と、バッテリユニット18と、電力分配器20と、低電圧ユニット22と、統合制御部24{以下「統合ECU24」(ECU:Electric Control Unit)と称する。}とを有する。
モータユニット14は、モータ30に加え、パワー・ドライブ・ユニット32(以下「PDU32」と称する。)と、減速機34と、シャフト36と、車輪38とを備える。
FCユニット16は、FC40に加え、水素タンク42と、エアコンプレッサ44と、逆流防止用ダイオード46と、電圧センサ48と、電流センサ50とを有する。
バッテリユニット18は、バッテリ60に加え、均等化回路62と、バッテリ制御部64(以下「バッテリECU64」と称する。)と、電圧センサ66と、ファン68と、コンタクタ70a、70bと、バッテリボックス72(図3、図4)とを有する。
電力分配器20は、モータユニット14、FCユニット16、バッテリユニット18及び低電圧ユニット22の間で電力を分配する。
図1に示すように、低電圧ユニット22は、ダウンバータ81と、ナビゲーション装置82と、低電圧バッテリ84と、低電圧バッテリ制御部86(以下「低電圧バッテリECU86」と称する。)と、コンタクタ88とを有する。低電圧ユニット22は、ナビゲーション装置82以外の補機、例えば、ライト、パワーウインド、ワイパー用電動機、オーディオ機器を有してもよい。
統合ECU24は、モータ30の要求電力(モータ要求電力Pmr_req)[W]やFCユニット16(エアコンプレッサ44等)の要求電力、ナビゲーション装置82等の補機の要求電力等に基づいて、モータユニット14、FCユニット16、バッテリユニット18、電力分配器20及び低電圧ユニット22等の各部を制御する。
車両状態を検出する各種スイッチ及び各種センサとしては、上述した電圧センサ48、66、電流センサ50の他、通信線90に接続されるイグニッションスイッチ100(以下「IGSW100」と称する。)、アクセルセンサ102、ブレーキセンサ104及び車速センサ106等がある。
図5は、第1実施形態においてFC40のFC発電電力Pfc及びバッテリ60の蓄電量SOCを制御するフローチャートである。図5の処理は、例えば、数ミリ秒〜数秒の周期で繰り返される。また、第1実施形態におけるFC発電電力Pfcの制御は、主として統合ECU24が行い、蓄電量SOCの制御は、主としてバッテリECU64及び統合ECU24が行う。
以上のように、第1実施形態によれば、予測された駐車時期に応じて、すなわち、駐車準備を要すると判断したとき、バッテリ60の蓄電量SOCを均等化回路62の放電抵抗78により放電させてバッテリ60の蓄電量SOCを低下させる。放電抵抗78による放電は作動音を伴わないため、作動音に伴う違和感を搭乗者に与えることなくバッテリ60の蓄電量SOCを低下させることができる。また、電動車両10が実際に駐車する前に駐車準備を開始することができるため、電動車両10が実際に駐車した後に初めてバッテリ60の蓄電量SOCを低下させる場合と比べて効率的である。
1.第2実施形態の構成(第1実施形態との構成の相違)
第2実施形態のハードウェアの構成は、第1実施形態と同じであり、両実施形態の相違点はその処理(ソフトウェア)にある。このため、以下では、第1実施形態の構成要素と同一の参照符号を用いて説明する。
図11は、第2実施形態においてFC40のFC発電電力Pfc及びバッテリ60の蓄電量SOCを制御するフローチャートである。図11の処理は、例えば、数ミリ秒〜数秒の周期で繰り返される。第2実施形態におけるFC発電電力Pfcの制御は、主として統合ECU24が行い、蓄電量SOCの制御は、主としてバッテリECU64及び統合ECU24が行う。
R=(SOC−SOC_low)/(SOC_up−SOC_low) …(1)
以上のように、第2実施形態では、第1実施形態で得られる効果に加え、下記の効果を得ることができる。
なお、この発明は、上記各実施形態に限らず、この明細書の記載内容に基づき、種々の構成を採り得ることはもちろんである。例えば、以下の構成を採用することができる。
上記各実施形態では、FC40とバッテリ60を備える電力システム12を電動車両10に搭載したが、これに限られず、別の対象に搭載してもよい。例えば、バッテリ60と太陽電池を備える車両に搭載してもよい。或いは、電力システム12を船舶や航空機等の移動体に用いることもできる。或いは、電力システム12を家庭用電力システムとして用いてもよい。この場合、風力発電システム、太陽発電システム等、一時的に電力を発生させる発電機と組み合わせることもできる。また、上記各実施形態では、電力システム12の負荷として走行用のモータ30等を挙げたが、電力システム12の用途に応じて別の負荷とすることもできる。
上記各実施形態では、バッテリ60と並列にモータ30(負荷)に接続される発電機として、FC40を用いたが、エンジンとオルタネータを組み合わせた発電機等、他の発電機を用いることもできる。
上記各実施形態では、駐車準備を要するとき、統合ECU24により、均等化回路62によるバッテリ60の放電を制御したが、これに限られず、例えば、バッテリECU64により制御することもできる。
上記各実施形態では、蓄電量SOC[%]に基づく制御を行ったが、バッテリ電圧Vbatに基づく制御を行うこともできる。すなわち、蓄電量SOCとバッテリ電圧Vbatとは一対一に対応するため、上述の制御における蓄電量SOCをバッテリ電圧Vbatに置き換えて行うことも可能である。
上記各実施形態では、駐車準備の要否(2段階の判断)により通常走行時目標蓄電量SOC_tar_dと駐車時目標蓄電量SOC_tar_pを設定し、これらを用いて均等化回路62による放電を制御した。しかし、これに限らず、3つ以上の目標蓄電量SOC_tarを設定してもよい。例えば、電動車両10の現在位置と目的地までの距離Dに応じて3つ以上の目標蓄電量SOC_tarを設定し、これらを用いて均等化回路62による放電を制御することもできる。或いは、距離Dではなく、目的地到着までの予想時間又は予想到着時刻に応じて目標蓄電量SOC_tarを設定することも可能である。
24…統合ECU(駐車時予測手段、蓄電電力制御手段、発電制御手段)
40…FC(発電機) 60…バッテリ(蓄電装置)
62…均等化回路 74…組電池
76…単位セル 78…放電抵抗
Pfc…FC発電電力 SOC…蓄電量
SOC_low…下限値 SOC_up…上限値
Claims (4)
- 複数の単位セルを組み合わせた組電池を有する蓄電装置からの電力により駆動する電動車両であって、
前記複数の単位セルそれぞれに並列に接続された放電抵抗により前記複数の単位セルのうち少なくとも1つの蓄電電力を放電させて前記複数の単位セルの蓄電量を均等化する均等化回路と、
前記電動車両の駐車時期を予測する駐車時期予測手段と、
前記駐車時期予測手段により予測された駐車時期に応じて、前記蓄電装置の蓄電電力を前記均等化回路により放電させて前記蓄電装置の蓄電電力を低下させる蓄電電力制御手段と
を備えることを特徴とする電動車両。 - 請求項1記載の電動車両において、
さらに、発電機と、前記発電機の出力を制御する発電制御手段とを備え、
前記発電機の発電電力を前記蓄電装置に充電可能であり、
前記蓄電電力制御手段は、前記予測された駐車時期に応じて、前記蓄電装置の蓄電量の許容上限値を低下させ、
前記発電制御手段は、前記許容上限値の低下に応じて、前記発電機の出力を制限する
ことを特徴とする電動車両。 - 請求項2記載の電動車両において、
前記発電機は、燃料電池であり、
前記蓄電電力制御手段は、
前記燃料電池の劣化を招く前記燃料電池の発電電力の低下条件を設定し、
前記蓄電装置の蓄電量の許容上限値を低下させているときに前記低下条件が満たされた場合、前記許容上限値の低下を中止する
ことを特徴とする電動車両。 - 請求項1〜3のいずれか1項に記載の電動車両において、
前記蓄電電力制御手段は、
前記予測された駐車時期に応じた放電を行わない通常走行時には、前記通常走行時における前記蓄電装置の蓄電量の許容下限値である通常走行時許容下限値を前記蓄電装置の蓄電量が下回らないように前記蓄電量を制御し、
前記予測された駐車時期に応じた放電を行う駐車準備時には、前記電動車両の駐車時における前記蓄電装置の蓄電量の目標値である駐車時目標蓄電量を設定し、前記駐車時において前記駐車時目標蓄電量と前記蓄電装置の蓄電量とが等しくなるように前記蓄電量を制御し、
前記駐車時目標蓄電量は、前記通常走行時許容下限値よりも高く設定される
ことを特徴とする電動車両。
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