JP5971027B2 - 駆動力制御装置及び車両の制御方法 - Google Patents
駆動力制御装置及び車両の制御方法 Download PDFInfo
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- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
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Description
図1は、本発明の実施の形態に係る四輪駆動車の概略の構成例を示す概略構成図である。図1に示すように、四輪駆動車100は、車体101と、走行用のトルクを発生する駆動源としてのエンジン102と、トランスミッション103と、エンジン102の駆動力が常時伝達される左右一対の主駆動輪としての左右前輪104a,104b(前輪側の左右輪)と、走行状態に応じてエンジン102の駆動力が断続可能に伝達される左右一対の補助駆動輪としての左右後輪105a,105b(後輪側の左右輪)とを備えている。
図2は、駆動力伝達装置1の構成例を示す断面図である。
駆動力制御装置10は、例えばCPU(Central Processing Unit)と記憶素子とを備え、CPUが記憶素子に記憶されたプログラムに基づいて処理を実行することにより、旋回半径推定手段11、目標スリップ角演算手段12、目標回転速度演算手段13、及び駆動力制御手段14として機能する。
旋回半径推定手段11は、四輪駆動車100の旋回半径を推定する。この旋回半径は、運転者が意図する理想的な旋回半径であり、例えば四輪駆動車100が走行している道路のカーブの曲率に適合した旋回半径である。旋回半径の推定は、例えば操舵角センサ155によって検出したステアリングホイール109の操舵角に基づいて推定することができる。また、例えば車載のカメラによって撮像した画像に基づいて旋回半径を推定してもよく、あるいはカーナビゲーションシステム等から得た地図情報及び現在地情報に基づいて旋回半径を推定してもよい。
目標スリップ角演算手段12は、旋回半径推定手段11によって推定した旋回半径に基づいて、四輪駆動車100の旋回時における目標スリップ角を演算する。ここで、スリップ角とは、四輪駆動車100の前後方向(車幅方向に直交する方向)に沿った中心軸と、四輪駆動車100の実際の進行方向とのなす角をいう。また、目標スリップ角とは、旋回半径推定手段11によって推定した旋回半径の円弧に沿って四輪駆動車100が走行するために好適なスリップ角をいう。
目標回転速度演算手段13は、旋回半径推定手段11によって推定した旋回半径、目標スリップ角演算手段12によって演算した目標スリップ角、及び車速に基づいて、左右後輪105a,105bの目標回転速度を演算する。ここで、目標回転速度とは、左右前輪104a,104b及び左右後輪105a,105bの回転速度に基づいて求めた四輪駆動車100の実際の車速にて、旋回半径推定手段11によって推定した旋回半径、及び目標スリップ角演算手段12によって演算した目標スリップ角で走行した場合の車輪の回転速度である。
駆動力制御手段14は、左後輪105a及び右後輪105bの実際の回転速度が目標回転速度演算手段13によって演算した目標回転速度に近づくように、左後輪105a及び右後輪105bに伝達される駆動力を制御する。
以上説明した本実施の形態によれば、推定した旋回半径の軌道に沿って四輪駆動車100が走行するように左後輪105a及び右後輪105bに伝達される駆動力が制御されるので、四輪駆動車100を目標の旋回半径に沿って走行させることが可能となる。すなわち、安定した旋回性能を得ることが可能となる。
Claims (4)
- 車両の旋回半径を推定する旋回半径推定手段と、
前記推定した前記旋回半径の円弧に沿って旋回するのに適した前記車両の前後方向と進行方向とがなす角である目標スリップ角を演算する目標スリップ角演算手段と、
前記推定した前記旋回半径、前記演算した前記目標スリップ角、及び車速に基づいて、前輪側及び後輪側のうち少なくとも一側の左右輪の目標回転速度を演算する目標回転速度演算手段と、
前記左右輪の実回転速度が前記演算した前記目標回転速度に近づくように、前記左右輪の駆動力を制御する駆動力制御手段と
を備えた駆動力制御装置。 - 前記駆動力制御手段は、前記前輪側及び前記後輪側のうち、駆動源の駆動力が断続可能に伝達される側の左車輪と右車輪の駆動力をそれぞれ独立して制御する、
請求項1に記載の駆動力制御装置。 - 前記駆動力制御手段は、駆動源の駆動力が伝達される入力回転部材と前記左車輪及び前記右車輪との間のトルク伝達量を調整することで前記左車輪及び前記右車輪の駆動力を制御し、前記左車輪及び前記右車輪から前記入力回転部材にトルクが伝達される制動時には、前記入力回転部材と前記左車輪との間のトルク伝達量と、前記入力回転部材と前記右車輪との間のトルク伝達量との大小関係を反転させる、
請求項2に記載の駆動力制御装置。 - 車両の旋回半径を推定し、
前記推定した前記旋回半径の円弧に沿って旋回するのに適した前記車両の前後方向と進行方向とがなす角である目標スリップ角を演算し、
前記推定した前記旋回半径、前記演算した前記目標スリップ角、及び車速に基づいて、前輪側及び後輪側のうち少なくとも一側の左右輪の目標回転速度を演算し、
前記左右輪の実回転速度が前記演算した前記目標回転速度に近づくように、前記左右輪の駆動力を制御する
車両の制御方法。
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JP2012182366A JP5971027B2 (ja) | 2012-08-21 | 2012-08-21 | 駆動力制御装置及び車両の制御方法 |
US13/962,049 US8886436B2 (en) | 2012-08-21 | 2013-08-08 | Driving force control apparatus and vehicle control method |
CN201310346708.8A CN103625465B (zh) | 2012-08-21 | 2013-08-09 | 驱动力控制装置以及车辆的控制方法 |
EP13180342.1A EP2700551B1 (en) | 2012-08-21 | 2013-08-14 | Driving force control apparatus and vehicle control method |
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JP5971027B2 true JP5971027B2 (ja) | 2016-08-17 |
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JP5668746B2 (ja) * | 2012-12-26 | 2015-02-12 | トヨタ自動車株式会社 | 車両の制御装置 |
JP5907142B2 (ja) * | 2013-10-22 | 2016-04-20 | トヨタ自動車株式会社 | 四輪駆動車両の制御装置 |
GB2522442A (en) * | 2014-01-24 | 2015-07-29 | Jaguar Land Rover Ltd | Driveline and method of controlling a driveline |
GB2534117B (en) | 2014-11-19 | 2018-09-12 | Jaguar Land Rover Ltd | Control system and method of controlling a driveline |
CN106314426B (zh) * | 2015-07-10 | 2019-01-11 | 比亚迪股份有限公司 | 用于四轮独立驱动的汽车的转弯控制方法及系统 |
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JP6787060B2 (ja) | 2016-11-11 | 2020-11-18 | 株式会社ジェイテクト | 駆動力制御装置及び車両の制御方法 |
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