JP6683949B2 - 車両の走行駆動装置 - Google Patents
車両の走行駆動装置 Download PDFInfo
- Publication number
- JP6683949B2 JP6683949B2 JP2016068412A JP2016068412A JP6683949B2 JP 6683949 B2 JP6683949 B2 JP 6683949B2 JP 2016068412 A JP2016068412 A JP 2016068412A JP 2016068412 A JP2016068412 A JP 2016068412A JP 6683949 B2 JP6683949 B2 JP 6683949B2
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- Prior art keywords
- regenerative braking
- braking force
- vehicle
- power
- generator
- Prior art date
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- 230000001172 regenerating effect Effects 0.000 claims description 86
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
更に、電圧を昇降圧する変圧装置を備え、車載バッテリから出力した電圧を変圧装置によって昇圧して電動モータを駆動する車両が提案されている。
また、好ましくは、前記所定選択段は、前記車両の走行レンジと同じ回生制動力を発揮するとよい。
また、好ましくは、前記車両に搭載された内燃機関と、該内燃機関により駆動されて発電した電力を前記変圧装置で変換して前記バッテリまたは電動機に供給する発電機と、前記発電機の発電電力を演算する発電機演算部と、を更に備え、
前記発電機演算部は、前記変圧装置の最大入出力電力から前記回生制動力選択部により選択された選択段にて発揮される回生発電電力を減算した値を前記発電電力の最大値に設定するとよい。
図1は、本発明の一実施形態の車両の走行駆動装置1の概略構成図である。
図1に示すように、本発明の一実施形態の走行駆動装置1を備えた車両は、前輪2(走行駆動輪)を駆動する電動のフロントモータ3(電動機)、後輪4を駆動する電動のリアモータ5、エンジン6(内燃機関)、発電機7、バッテリ8を備えた四輪駆動のハイブリッド車である。
また、車両には、フロントモータ3への電力供給を制御するインバータ12と、リアモータ5への電力供給を制御するインバータ13と、発電機7の出力を制御するインバータ14とを備えている。
フロントモータ3は、昇圧コンバータ15、インバータ12を介してバッテリ8から電力を供給されて駆動するとともに、発電機7からインバータ14、インバータ12を介して電力を供給されて駆動可能であり、フロントトランスアクスル16を介して前輪2を駆動する。
発電機7によって発電されインバータ14から出力した電力は、昇圧コンバータ15を介してバッテリ8を充電可能であるとともに、インバータ12を介してフロントモータ3に、また昇圧コンバータ15及びインバータ13を介してリアモータ5に、夫々電力を供給可能である。
バッテリ8は、リチウムイオン電池等の二次電池で構成され、複数の電池セルをまとめて構成された図示しない電池モジュールを有している。
インバータ12、インバータ13、インバータ14は、車両に搭載されたハイブリッドコントロールユニット20(回生制動力演算部、発電機演算部)からの制御信号によって作動制御される。
また、運転席には車両の走行モードを選択するレバーが設けられている。このレバーにより、Dレンジ(走行レンジ)、Nレンジなどの車両の走行モードを選択できる。また、車両のステアリングには、シフトアップスイッチとシフトダウンスイッチを含み変速操作を行なうパドルスイッチ31(回生制動力選択部)が設けられている。パドルスイッチ31は、車両減速時における回生制動トルク(減速トルクTm)をB0からB5の6段階のシフトレンジから選択して切換え可能である。ここで、減速トルクはエンブレトルクと表現してもよい。B0は回生制動トルクが0、又は、小さな値であり、B1からB2、B3、B4、B5の順番に回生制動トルクが増加する。B2は、エンジン駆動車のエンジンブレーキと同等の制動トルクが付与されるDレンジであり、本発明における所定選択段に該当する。
ハイブリッドコントロールユニット20は、車両の総合的な制御を行うための制御装置であり、入出力装置、記憶装置(ROM、RAM、不揮発性RAM等)、中央演算処理装置(CPU)及びタイマ等を含んで構成される。
そして、ハイブリッドコントロールユニット20は、車両のアクセルセンサ24からのアクセル操作量等の各種検出量や各種作動情報に基づいて、エンジンコントロールユニット30、各インバータ13〜14、昇圧コンバータ15、クラッチ11に制御信号を送信して、クラッチ11の断接を伴う走行モード(EVモード、シリーズモード、パラレルモード)の切換え、エンジン6とフロントモータ3とリアモータ5の出力トルク、発電機7の発電電力を制御する。
EVモード及びシリーズモードでは、クラッチ11が切断される。EVモードでは、エンジン6が停止し、バッテリ8からの電力によってフロントモータ3及びリアモータ5を駆動する。シリーズモードでは、エンジン6を作動して発電機7により発電させ、フロントモータ3、リアモータ5に電力を供給して駆動する。
図2に示すように、ハイブリッドコントロールユニット20は、昇圧最大入出力制限演算部40、モータトルク制限演算部41、駆動トルク演算部42、モータトルク演算部(回生制動力演算部)43、発電電力制限演算部44、発電電力演算部45、発電機トルク制限演算部47、回転速度演算部48、発電機トルク演算部49を備えている。
モータトルク制限演算部41は、モータトルク(フロントモータ3及びリアモータ5の力行トルク、回生トルク)の上限値であるモータ最大トルクを夫々演算する。
駆動トルク演算部42は、車両全体の駆動トルク(ユーザ要求駆動トルクTur)を演算する。
発電電力制限演算部44は、発電機7の発電電力の最大値を演算する。
発電電力演算部45は、ユーザ要求駆動トルクTurに対応して必要な発電機7による発電電力である発電機出力Pgを演算する。そして、発電機7においてこの発電機出力Pgの発電が可能となるように、エンジンコントロールユニット30を介してエンジン6を作動制御する。
回転速度演算部48は、発電機出力Pgに対応する発電機7の回転速度を演算する。
発電機トルク演算部49は、回転速度演算部48で演算した発電機7の回転速度にするための発電機トルクを演算する。そして、この発電機トルクに基づいて、インバータ14を介して発電機7を制御する。
図3は、走行駆動装置1における駆動制御要領を示すフローチャートである。図4は、選択可能レンジの設定状態を示す説明図である。なお、図4中の実線が昇圧コンバータ上限電力Pvmaxを示し、破線が減速電力(エンブレ電力)Pmfを示す。
始めに、ステップS10では、温度センサ21から昇圧コンバータ15の温度を入力する。そして、ステップS20に進む。
ステップS20では、ステップS10で入力した昇圧コンバータ15の温度に基づいて、昇圧コンバータ上限電力Pvmaxを演算する。昇圧コンバータ上限電力Pvmaxは、昇圧コンバータ15において入出力可能な電力の上限値である。昇圧コンバータ上限電力Pvmaxは、例えばあらかじめ記憶したマップを用いて演算され、例えば図4の実線で示すように、昇圧コンバータ15の温度が高くなるに伴って昇圧コンバータ上限電力Pvmaxが低くなるように設定される。そして、ステップS30に進む。なお、本ステップの制御は上記の昇圧最大入出力制限演算部40における機能に相当する。
本実施形態の車両は、前輪2をフロントモータ3によって駆動するとともに、後輪4をリアモータ5によって駆動可能な四輪駆動車であり、減速時にはフロントモータ3及びリアモータ5によって回生制動が可能である。そして、ハイブリッドコントロールユニット20は、この回生制動トルクをインバータ12、13を介して夫々制御可能である。
車両には昇圧コンバータ15が搭載されており、バッテリ8から昇圧コンバータ15によって高圧化した電力をフロントモータ3に供給して駆動するように構成されている。車両減速時においては、発電機7による発電電力及びフロントモータ3による回生電力(エンブレ電力Pmf)が昇圧コンバータ15を通過して、バッテリ8に供給されて充電する。
また、昇圧コンバータ上限電力Pvmaxに基づいて、シフトレンジの選択範囲が制限された際に、運転者によるパドルスイッチ31の操作と一致しない場合に、表示や警報灯により運転者に警告するので、回生制動が制限されていることを運転者に報知することができる。
3 フロントモータ(電動機)
6 エンジン(内燃機関)
7 発電機
8 バッテリ
15 昇圧コンバータ(変圧装置)
20 ハイブリッドコントロールユニット(回生制動力演算部、発電機演算部)
31 パドルスイッチ(回生制動力選択部)
32 報知部
Claims (5)
- 車両の駆動輪の回転力により回生発電して回生制動力を発揮する電動機と、
前記車両に搭載されたバッテリと、
前記電動機により前記回生発電した電力を変換して前記バッテリに供給すると共に温度状態に基づいて最大入出力電力が制限される変圧装置と、
前記回生制動力の大きさを段階的に変更するよう設定する回生制動力選択部と、
前記回生制動力選択部により設定された選択段に基づいて回生制動力を算出する回生制動力演算部と、を有し、
前記回生制動力演算部は、
前記変圧装置が制限されている際に、所定選択段より回生制動力が大きくなる方向の選択段が前記回生制動力選択部により選択されている場合に、当該選択されている選択段に対応して前記電動機により発揮される回生制動力を、前記変圧装置が制限されていない際と比較して低減させることを特徴とする車両の走行駆動装置。 - 前記回生制動力演算部は、
前記変圧装置が制限されている際であっても、前記所定選択段又は前記所定選択段より回生制動力が小さくなる方向の選択段が前記回生制動力選択部により選択されている場合には、前記回生制動力を通常時の回生制動力と同じ回生制動力を発揮することを特徴とする請求項1に記載の車両の走行駆動装置。 - 前記所定選択段は、前記車両の走行レンジと同じ回生制動力を発揮することを特徴とする請求項1または2に記載の車両の走行駆動装置。
- 前記変圧装置が制限されている際であって、前記所定選択段より回生制動力が大きくなる方向の選択段が前記回生制動力選択部により選択されている場合に、前記車両の搭乗者に報知する報知部を備えたことを特徴とする請求項1から3のいずれか1項に記載の車両の走行駆動装置。
- 前記車両に搭載された内燃機関と、
該内燃機関により駆動されて発電した電力を前記変圧装置で変換して前記バッテリまたは電動機に供給する発電機と、
前記発電機の発電電力を演算する発電機演算部と、を更に備え、
前記発電機演算部は、前記変圧装置の最大入出力電力から前記回生制動力選択部により選択された選択段にて発揮される回生発電電力を減算した値を前記発電電力の最大値に設定することを特徴とする請求項1から4のいずれか1項に記載の車両の走行駆動装置。
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JP2016068412A JP6683949B2 (ja) | 2016-03-30 | 2016-03-30 | 車両の走行駆動装置 |
US15/464,478 US10086825B2 (en) | 2016-03-30 | 2017-03-21 | Travel driving apparatus of vehicle |
CN201710190280.0A CN107264294B (zh) | 2016-03-30 | 2017-03-27 | 车辆的行进驱动装置 |
EP17163705.1A EP3225489B1 (en) | 2016-03-30 | 2017-03-29 | Travel driving apparatus of vehicle |
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JP6772947B2 (ja) * | 2017-04-27 | 2020-10-21 | トヨタ自動車株式会社 | ハイブリッド自動車 |
JP6888512B2 (ja) * | 2017-10-16 | 2021-06-16 | トヨタ自動車株式会社 | ハイブリッド自動車 |
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