JP5373201B2 - 走行モード切替制御装置、ハイブリッド自動車および走行モード切替制御方法、並びにプログラム - Google Patents
走行モード切替制御装置、ハイブリッド自動車および走行モード切替制御方法、並びにプログラム Download PDFInfo
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- B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
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- Electric Propulsion And Braking For Vehicles (AREA)
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Description
以下、本発明の第一の実施の形態のハイブリッド自動車について、図1〜図4を参照しながら説明する。
ハイブリッド自動車1によれば、運転者の要求トルクが電動機13の最大トルクを超えていると推定された場合には、電動機走行モードの実行中であっても、アシスト走行モードまたはエンジン走行モードに走行モードを切替えるようにしたので、要求トルクに応じたトルクを出力させることができる。すなわち換言すると、電動機13の最大トルクを超える要求トルクの場合、エンジン12の動力で補完できるので、電動機13およびインバータ14などの周辺機器は、エンジン10と同等のトルクを発生可能とする必要はなく、電動機13およびインバータ14などの周辺機器の小型化、軽量化、および低コスト化を図ることができる。
本発明の第二の実施の形態のハイブリッド自動車1Aを図5のフローチャートおよび図6のタイミングチャートを参照して説明する。ハイブリッド自動車1Aの構成はハイブリッド自動車1と共通であり、同じ系統の符号(たとえばハイブリッドECU18A、回転速度同期制御部31Aなど)を用いて説明する。
ハイブリッド自動車1Aによれば、エンジン10の回転速度が電動機13の回転速度よりも若干(たとえばΔαrpm)大きいときにクラッチ12を断状態から接状態に移行させるので、クラッチ12が接続されたときにハイブリッド自動車1Aの減速感が無く、ドライバビリティを向上させることができる。
本発明の第三の実施の形態のハイブリッド自動車1Bを図7のフローチャートおよび図8のタイミングチャートを参照して説明する。ハイブリッド自動車1Bの構成はハイブリッド自動車1と共通であり、同じ系統の符号(たとえば要求トルク推定部30B、モード切替制御部32Bなど)を用いて説明する。
ハイブリッド自動車1Bによれば、電動機走行モードでの加速中に要求トルク推定部30の推定結果が電動機13の最大トルクを超えていない場合であっても次回の変速のタイミングでモードの切替えを実行する。
上述した実施の形態では、ステップS2の手続きにおいて、アクセル開度が所定値以上か否かを判定したが、これに代えてアクセル開度変化量が所定値以上か否かを判定してもよい。たとえばアクセル開度変化量が大きい場合、要求トルク推定部30は、運転者は急なアクセル操作を行っており、これは運転者が急加速を要求していると判定できるので、モード切替制御部30は、電動機走行モードからエンジン走行モードにモード切替えを行うように制御する。
Claims (5)
- エンジンと、電動機と、前記エンジンの回転軸と前記電動機の回転軸とを接続するクラッチとを有し、前記エンジンもしくは前記電動機により走行可能であり、または前記エンジンと前記電動機とが協働して走行するハイブリッド自動車の走行モード切替制御装置において、
運転者のアクセル操作に基づいて要求トルクを推定する要求トルク推定手段と、
前記電動機による走行が可能と判断され、前記電動機による走行モードの実行中に前記要求トルク推定手段の推定結果が前記電動機の最大トルクを超えたときは、前記電動機による走行モードの実行中にも係らずエンジンもしくはエンジンと電動機とが協働して走行するモードにモード切替えを行うモード切替手段と、
を有し、
前記モード切替手段は、前記電動機による走行モードで発進し加速中に前記要求トルク推定手段の推定結果が前記電動機の最大トルクを超えていない場合であっても発進後の次回のシフトアップのタイミングでモードの切替えを実行し、
前記電動機による走行モードから前記エンジンもしくは前記エンジンと前記電動機とが協働して走行するモードに切替えを行う際には、前記エンジンの回転速度を前記電動機の回転速度よりも速くした状態で前記クラッチを接に制御する、
ことを特徴とする走行モード切替制御装置。 - 請求項1記載の走行モード切替制御装置であって、
前記要求トルク推定手段は、運転者のアクセル操作におけるアクセル開度変化量もしくはアクセル開度が所定値を超えたか否かを判定する、
ことを特徴とする走行モード切替制御装置。 - 請求項1または2項記載の走行モード切替制御装置を有することを特徴とするハイブリッド自動車。
- エンジンと、電動機と、前記エンジンの回転軸と前記電動機の回転軸を接続するクラッチとを有し、前記エンジンもしくは前記電動機により走行可能であり、または前記エンジンと前記電動機とが協働して走行するハイブリッド自動車の走行モード切替制御方法において、
運転者のアクセル操作に基づいて要求トルクを推定する要求トルク推定ステップと、
前記電動機による走行が可能と判断され、前記電動機による走行モードの実行中に前記要求トルク推定ステップの処理による推定結果が前記電動機の最大トルクを超えたときは、前記電動機による走行モードの実行中にも係らずエンジンもしくはエンジンと電動機とが協働して走行するモードにモード切替えを行うモード切替ステップと、
を有し、
前記モード切替ステップは、前記電動機による走行モードで発進し加速中に前記要求トルク推定手段の推定結果が前記電動機の最大トルクを超えていない場合であっても発進後の次回のシフトアップのタイミングでモードの切替えを実行し、前記電動機による走行モードから前記エンジンもしくは前記エンジンと前記電動機とが協働して走行するモードに切替えを行う際には、前記エンジンの回転速度を前記電動機の回転速度よりも速くした状態で前記クラッチを接に制御する、
ことを特徴とする走行モード切替制御方法。 - 情報処理装置に、請求項3記載の走行モード切替制御装置の機能を実現させることを特徴とするプログラム。
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