JP7088096B2 - 車両用電池制御装置 - Google Patents
車両用電池制御装置 Download PDFInfo
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims description 12
- 230000006866 deterioration Effects 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 description 63
- 238000012545 processing Methods 0.000 description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- 230000005856 abnormality Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Description
以下、本発明の実施形態について、図面を参照しながら詳細に説明する。
図1は、本発明の一実施形態に係る車両用電池制御装置1を含む電源システムの概略構成を示す図である。図1に例示した電源システムは、メイン電池11と、サブ電池12と、1次系統機器21と、2次系統機器22と、電力供給部30と、接続切り替え回路40、制御部51、センサー(S)52、及びヒーター(H)53を含む車両用電池制御装置1と、を備えている。本電源システムは、手動運転と自動運転とを切り替え可能な車両に搭載される。
次に、図3乃至図5Bをさらに参照して、本実施形態に係る車両用電池制御装置1が行う制御を説明する。図3は、車両用電池制御装置1の制御部51が実行する電池制御の処理手順を説明するフローチャートである。図4は、図3の第1電池制御(ステップS302)の詳細な処理手順を説明するフローチャートである。図5A及び図5Bは、図3の第2電池制御(ステップS309)の詳細な処理手順を説明するフローチャートである。
図3に例示する電池制御は、車両のイグニッションがオン状態(IG-ON)になると開始され、イグニッションがオフ状態(IG-OFF)になるまで繰り返し実行される。なお、イグニッションがオンされた直後における車両の状態は、手動運転が行われる状態であるものとして説明する。
図3のステップS302における第1電池制御では、図4に示す以下のステップS401~S410が行われる。
図3のステップS309における第2電池制御では、図5A及び図5Bに示す以下のステップS501~S516の処理が行われる。なお、図5Aの処理と図5Bの処理とは、結合子X及び結合子Yでそれぞれ結ばれる。
出力可能電力P = 放電後降下電圧Vend × 平均電流Iave …[1]
図12及び図13を参照して、本実施形態に係る車両用電池制御装置1において、ドライバーから要求された自動運転を素早く実行することができることを説明する。図12は、本実施形態に係る車両用電池制御装置1における自動運転の実行タイミングを示す図である。図13は、従来の車両用電池制御装置における自動運転の実行タイミングを示す図である。
上述した本発明の一実施形態に係る車両用電池制御装置1によれば、イグニッションオン後の手動運転の期間に、サブ電池12の状態を短時間で推定し(第1電池制御)、その推定結果に基づいてサブ電池12が自動運転の退避走行時に必要なバックアップ電力を出力可能であるか否かを暫定的に判断する(第1電池制御)。そして、サブ電池12がバックアップ電力を出力可能であると暫定的に判断できれば、自動運転を直ちに許可できる状態にする。これにより、ドライバーなどから自動運転の要求がある前にサブ電池12がバックアップ電力を出力可能であると暫定的に判断できていれば、自動運転を許可状態とした後に要求された自動運転を素早く実行することができる。
11 メイン電池
12 サブ電池
21 1次系統機器
22 2次系統機器
30 電力供給部
40 接続切り替え回路
41 第1スイッチ
42 第2スイッチ
43 DCDCコンバーター
51 制御部
52 センサー
53 ヒーター
Claims (7)
- 自動運転時にメイン電池をバックアップ可能なサブ電池を制御する車両用電池制御装置であって、
前記サブ電池の電流、電圧、及び温度に関する情報を取得するセンサーと、
前記メイン電池と前記サブ電池との間に設けられるDCDCコンバーターと、
手動運転時と自動運転時とで前記サブ電池の接続状態を切り替える切り替え部と、
前記センサーが取得した情報に基づいて前記DCDCコンバーター及び前記切り替え部を制御し、前記サブ電池の充放電を制御する制御部とを備え、
前記制御部は、
イグニッションオン後の手動運転の期間に、前記サブ電池が自動運転の退避走行時に必要なバックアップ電力を出力可能であるか否かを、所定の第1電池制御を行って暫定的に判断し、
前記第1電池制御を行って前記サブ電池が前記バックアップ電力を出力可能と判断した場合に自動運転を許可し、
自動運転を許可した後、所定の要求に応じて自動運転を実行し、かつ、前記サブ電池が前記バックアップ電力を出力可能であるか否かを、前記第1電池制御よりも精度が高い所定の第2電池制御を行って判断する、
車両用電池制御装置。 - 前記制御部は、
前記第1電池制御として、所定の第1時間による所定の充放電を前記サブ電池に実施し、当該充放電時の電流及び電圧の変化に基づいて前記サブ電池の抵抗値を算出し、当該算出した抵抗値に基づいて得られるバックアップに必要な抵抗値及び蓄電量を満たしたときの前記サブ電池の第1温度が、所定の第1基準温度未満であるか否かを推定し、
前記サブ電池の第1温度が前記第1基準温度未満であると推定した場合に、前記サブ電池が前記バックアップ電力を出力可能であると判断する、
請求項1に記載の車両用電池制御装置。 - 前記制御部は、
前記第2電池制御として、前記第1時間よりも長い所定の第2時間による所定の放電を前記サブ電池に実施し、当該放電中の平均電流及び放電後の降下電圧を算出し、当該算出した平均電流及び降下電圧に基づいて得られる前記サブ電池の出力可能電力が、所定の第2基準温度において前記サブ電池に要求される前記バックアップ電力以上であるか否かを判定し、
前記サブ電池の出力可能電力が前記第2基準温度において前記サブ電池に要求される前記バックアップ電力以上であると判定した場合に、前記サブ電池が前記バックアップ電力を出力可能であると判断する、
請求項2に記載の車両用電池制御装置。 - 前記制御部は、前記サブ電池の放電として自動運転の退避走行時に必要とされる電流を流す、
請求項3に記載の車両用電池制御装置。 - 前記制御部は、前記第2電池制御による前記サブ電池の放電中に前記サブ電池の出力電圧が所定値以上の大きさの変化速度で低下したと判断した場合、前記サブ電池の放電を停止する、
請求項3又は4に記載の車両用電池制御装置。 - 前記制御部は、前記第2基準温度を前記サブ電池の劣化度に応じて複数設けている、
請求項3乃至5のいずれかに記載の車両用電池制御装置。 - 前記制御部は、前記サブ電池の蓄電量を、手動運転時には蓄電上限値に基づいて設定される第1蓄電量に制御し、自動運転時には前記第1蓄電量よりも低く、かつ、自動運転時に前記サブ電池と電気的に接続される車載機器の耐久電圧に基づいて設定される第2蓄電量に制御する、
請求項1乃至6のいずれかに記載の車両用電池制御装置。
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