JP2019181982A - 車両用電源装置 - Google Patents
車両用電源装置 Download PDFInfo
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- JP2019181982A JP2019181982A JP2018070905A JP2018070905A JP2019181982A JP 2019181982 A JP2019181982 A JP 2019181982A JP 2018070905 A JP2018070905 A JP 2018070905A JP 2018070905 A JP2018070905 A JP 2018070905A JP 2019181982 A JP2019181982 A JP 2019181982A
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- Prior art keywords
- power supply
- state
- engine
- starter generator
- switch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
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- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
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- F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
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Abstract
Description
図1は本発明の一実施の形態である車両用電源装置10が搭載された車両11の構成例を示す概略図である。図1に示すように、車両11には、動力源であるエンジン12を備えたパワーユニット13が搭載されている。エンジン12のクランク軸14には、ベルト機構15を介してスタータジェネレータ(電動モータ)16が機械的に連結されている。また、エンジン12にはトルクコンバータ17を介して変速機構18が連結されており、変速機構18にはデファレンシャル機構19等を介して車輪20が連結されている。
車両用電源装置10が備える電源回路30について説明する。図2は電源回路30の一例を簡単に示した回路図である。図2に示すように、電源回路30は、スタータジェネレータ16に電気的に接続される鉛バッテリ(第1蓄電体)31と、これと並列にスタータジェネレータ16に電気的に接続されるリチウムイオンバッテリ(第2蓄電体)32と、を備えている。なお、リチウムイオンバッテリ32を積極的に放電させるため、リチウムイオンバッテリ32の端子電圧は、鉛バッテリ31の端子電圧よりも高く設計されている。また、リチウムイオンバッテリ32を積極的に充放電させるため、リチウムイオンバッテリ32の内部抵抗は、鉛バッテリ31の内部抵抗よりも小さく設計されている。
図1に示すように、車両用電源装置10は、パワーユニット13や電源回路30等を互いに協調させて制御するため、マイコン等からなるメインコントローラ60を有している。このメインコントローラ60には、スロットルバルブやインジェクタ等のエンジン補機61を制御するエンジン制御部62、スタータジェネレータ16を制御するモータ制御部(アシスト制御部)63、スイッチSW1,SW2を制御するスイッチ制御部64、アイドリングストップ制御を実行するアイドリング制御部65、およびバッテリセンサ45の故障を検出するセンサ監視部66等が設けられている。
スタータジェネレータ16の発電制御について説明する。メインコントローラ60は、リチウムイオンバッテリ32の充電状態SOCに基づいて、スタータジェネレータ16の目標発電電圧を設定する。そして、メインコントローラ60は、目標発電電圧をISGコントローラ23に出力し、スタータジェネレータ16を後述する燃焼発電状態や発電休止状態に制御する。
スタータジェネレータ16の力行制御に伴うスイッチSW1の切替制御について説明する。前述したように、スタータジェネレータ16を燃焼発電状態、回生発電状態および発電休止状態に制御する際には、スイッチSW1,SW2が共にON状態に制御される。一方、スタータジェネレータ16を力行状態に制御する際には、スタータジェネレータ16の作動状態に応じて消費電力が変化するため、後述するように、スタータジェネレータ16の作動状態に応じてスイッチSW1がON状態やOFF状態に制御される。
前述したように、スタータジェネレータ16をアシスト駆動させる場合には、スイッチSW1がON状態に保持される。つまり、スタータジェネレータ16と鉛バッテリ31とが互いに接続されるため、スタータジェネレータ16の消費電力やリチウムイオンバッテリ32の充電状態SOCによっては、図8に破線の矢印αで示すように、鉛バッテリ31からスタータジェネレータ16に電流が流れてしまう虞がある。そこで、メインコントローラ60は、バッテリセンサ45を用いて鉛バッテリ31の充放電状況を監視し、鉛バッテリ31の過放電を防止しつつモータアシスト制御を実行している。例えば、鉛バッテリ31が過度に放電していた場合には、モータトルクを下げることでスタータジェネレータ16の消費電力が下げられている。しかしながら、バッテリセンサ45が故障していた場合には、鉛バッテリ31の充放電状況を監視することが困難になるため、鉛バッテリ31の過放電を招いてしまう虞がある。そこで、メインコントローラ60は、鉛バッテリ31の過放電を防止するため、バッテリセンサ45が故障した場合に、以下のフェイルセーフ制御を実行している。
11 車両
12 エンジン
16 スタータジェネレータ(電動モータ)
31 鉛バッテリ(第1蓄電体)
32 リチウムイオンバッテリ(第2蓄電体)
43 電気機器
45 バッテリセンサ(充放電検出部)
51 第1電源系
52 第2電源系
63 モータ制御部(アシスト制御部)
64 スイッチ制御部
65 アイドリング制御部
SW1 第1スイッチ(スイッチ)
Claims (6)
- 車両に搭載される車両用電源装置であって、
第1蓄電体と、前記第1蓄電体に接続される電気機器と、を備える第1電源系と、
エンジンに連結される電動モータと、前記電動モータに接続される第2蓄電体と、を備える第2電源系と、
前記第1電源系と前記第2電源系とを接続する導通状態と、前記第1電源系と前記第2電源系とを切り離す遮断状態と、に制御されるスイッチと、
前記電動モータの作動状態に基づいて、前記スイッチを導通状態と遮断状態とに制御するスイッチ制御部と、
前記電動モータを力行状態に制御することにより、前記エンジンを補助するモータアシスト制御を実行するアシスト制御部と、
を有し、
前記スイッチ制御部は、前記モータアシスト制御が実行される場合に、前記スイッチを導通状態に制御し、
前記アシスト制御部は、前記第1蓄電体の充放電状況を検出する充放電検出部が故障した場合に、前記モータアシスト制御を禁止する、
車両用電源装置。 - 請求項1に記載の車両用電源装置において、
前記アシスト制御部は、前記モータアシスト制御の実行中に前記充放電検出部が故障した場合に、前記電動モータの力行トルクを徐々に低下させた後に前記モータアシスト制御を禁止する、
車両用電源装置。 - 請求項1または2に記載の車両用電源装置において、
停止条件が成立した場合に前記エンジンを停止させ、始動条件が成立した場合に前記エンジンを始動させるアイドリングストップ制御を実行するアイドリング制御部、を有し、
前記アイドリング制御部は、前記充放電検出部が故障した場合に、前記アイドリングストップ制御を禁止する、
車両用電源装置。 - 請求項3に記載の車両用電源装置において、
前記アイドリング制御部は、前記エンジンの停止中に前記充放電検出部が故障した場合に、前記エンジンの始動後に前記アイドリングストップ制御を禁止する、
車両用電源装置。 - 請求項3または4に記載の車両用電源装置において、
前記アイドリング制御部は、前記エンジンの停止中に前記充放電検出部が故障した場合に、前記始動条件の成立を待たずに前記エンジンを始動させる、
車両用電源装置。 - 請求項1〜5のいずれか1項に記載の車両用電源装置において、
前記スイッチ制御部は、前記電動モータが前記エンジンを始動回転させる場合に、前記スイッチを遮断状態に制御する、
車両用電源装置。
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