JP2016101874A - 四輪駆動車の制御装置 - Google Patents
四輪駆動車の制御装置 Download PDFInfo
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Abstract
Description
本発明の実施の形態について、図1乃至図7を参照して説明する。なお、以下に示す実施の形態は、本発明の四輪駆動車の制御装置を実施する場合の好適な一具体例として示すものであり、技術的に好ましい種々の技術的事項を具体的に例示している部分もあるが、本発明の技術的範囲は、この具体的態様に限定されるものではない。
図2(a)は、噛み合いクラッチ3及びその周辺部の構成例を示す断面図であり、図2(b)は、解放状態における噛み合いクラッチ3の噛み合い部を模式的に示す説明図である。なお、図2(a)では、噛み合いクラッチ3におけるフロントデフケース134の回転軸線Oよりも上側の半分の範囲を図示している。
図3は、トルクカップリング4及びその周辺部の概略の構成例を示す概略構成図である。トルクカップリング4は、多板クラッチ41,電磁クラッチ42,カム機構43、インナシャフト44、及びこれらを収容するハウジング45を有し、後輪側ギヤ機構16及びリヤディファレンシャル17と共にディファレンシャルキャリア170に収容されている。
ECU5は、図1に示すように、CPU等を含む演算回路からなる制御部51と、ROMやRAM等の記憶素子からなる記憶部52と、噛み合いクラッチ3のアクチュエータ34及びトルクカップリング4の電磁コイル421に制御電流(励磁電流)を供給する電流出力回路53とを有している。また、ECU5は、第1乃至第5回転速センサ501〜505によって、左右前輪21L,21R、左右後輪22L,22R、及びプロペラシャフト15の回転速度を検知可能であり、アクセルペダルセンサ506によってアクセルペダル111の加速操作量を検知可能である。またさらに、ECU5は、例えばCAN(Controller Area Network)等の車内通信網を介して、操舵角やヨーレイト等の走行状態に関する各種情報を取得可能である。
図6は、制御部51が実行する処理の一部を示すフローチャートである。制御部51は、このフローチャートに示す処理を所定の周期で実行する。制御部51は、推定駆動力が駆動力閾値よりも大きいとき、トルクカップリング4の多板クラッチ41を駆動力伝達可能な状態とし、多板クラッチ41によって後輪22からプロペラシャフト15に伝達される回転力によって噛み合いクラッチ3における第1回転部材31と第2回転部材32とを回転同期させ、第1回転部材31と第2回転部材32とを噛み合わせる。また、本実施の形態では、推定駆動力が駆動力閾値よりも所定値以上大きいとき、推定駆動力と駆動力閾値との差が当該所定値未満である場合に比較して、多板クラッチ41によって伝達される回転力を大きくする。
以上説明した第1の実施の形態によれば、以下に示す作用及び効果が得られる。
次に、図8を参照して本発明の第2の実施の形態について説明する。
次に、図9を参照して本発明の第3の実施の形態について説明する。
以上、本発明を第1乃至第3の実施の形態に基づいて説明したが、上記に記載した実施の形態は特許請求の範囲に係る発明を限定するものではない。また、実施の形態の中で説明した特徴の組合せの全てが発明の課題を解決するための手段に必須であるとは限らない点に留意すべきである。
Claims (6)
- 駆動源の駆動力が常時伝達される主駆動輪と、車両の前後方向に前記駆動力を伝達する駆動軸を介して前記駆動源の駆動力が伝達される補助駆動輪と、前記駆動源から前記駆動軸への駆動力伝達を遮断可能な第1のクラッチと、前記駆動軸から前記補助駆動輪への駆動力伝達を遮断可能な第2のクラッチと、を備えた四輪駆動車に搭載され、前記第1及び第2のクラッチを制御する四輪駆動車の制御装置であって、
前記第1及び第2のクラッチにおける駆動力伝達が遮断された二輪駆動時に、車速及び運転者による加速操作量に基づいて前記主駆動輪に伝達されると推定される推定駆動力を演算し、前記推定駆動力が前記主駆動輪のスリップ限界トルクに応じて定められた駆動力閾値よりも大きいとき、前記第1及び前記第2のクラッチのうち何れか一方のクラッチを駆動力伝達可能な状態とする、
四輪駆動車の制御装置。 - 前記駆動力閾値を前記スリップ限界トルクよりも小さな値に設定する、
請求項1に記載の四輪駆動車の制御装置。 - 前記第1のクラッチは、第1回転部材に形成された凹部と第2回転部材に形成された凸部との噛み合いによって駆動力を伝達する噛み合いクラッチであり、前記第2のクラッチは、クラッチプレート間の摩擦によって駆動力を伝達する摩擦クラッチであり、
前記推定駆動力が前記駆動力閾値よりも大きいとき、前記第2のクラッチを駆動力伝達可能な状態とし、前記第2のクラッチによって前記補助駆動輪から前記駆動軸に伝達される回転力によって前記第1のクラッチにおける前記第1回転部材と前記第2回転部材とを回転同期させる、
請求項1又は2に記載の四輪駆動車の制御装置。 - 前記推定駆動力が前記駆動力閾値よりも所定値以上大きいとき、前記推定駆動力と前記駆動力閾値との差が前記所定値未満である場合に比較して、前記第2のクラッチによって伝達される回転力を大きくする、
請求項3に記載の四輪駆動車の制御装置。 - 路面摩擦係数の推定値及び前記主駆動輪に作用する荷重の推定値に基づいて前記スリップ限界トルクを演算する、
請求項1乃至4の何れか1項に記載の四輪駆動車の制御装置。 - 前記主駆動輪に作用する横力をさらに加味して前記スリップ限界トルクを演算する、
請求項5に記載の四輪駆動車の制御装置。
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