JP2020029238A - 車両の走行制御システム - Google Patents
車両の走行制御システム Download PDFInfo
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Abstract
Description
[横風時自動運転安定車速Vd1_w]
ステップS1Aにおける横風時自動運転安定車速Vd1_wは、目標経路に対して自車両の横位置を許容範囲内に維持する操舵性能を確保できる車速として算出される。詳細には、図4の最初のステップS101において、一定時間の横位置の分散が設定値以上(例えば、±10cm以上)か否かを調べる。
[雨天時自動運転安定車速Vd1_r]
ステップS1Bにおける雨天時自動運転安定車速Vd1_rは、目標経路への追従走行の操舵及び前後位置制御に必要な視程距離を確保できる車速として算出される。すなわち、図5のサブルーチンにおいて、先ずステップS201で車載のカメラユニット11或いは地図情報処理装置30からの地図情報による車線の検知範囲が操舵制御可能な車線検知距離未満か否かを調べ、ステップS202で地図情報を使用できない場合にカメラユニット11の白線検知距離が操舵制御可能な検知距離未満か否かを調べる。また、ステップS203において、現在の視程距離が前方の車両等に対する前後位置をブレーキ制御等を介して制御可能な視程距離未満か否かを調べる。
[降雪時自動運転安定車速Vd1_s]
ステップS1Cにおける降雪時自動運転安定車速Vd1_sは、車載のカメラユニット11を用いることなく操舵制御に必要な視程距離を確保できる車速として算出される。詳細には、図6のサブルーチンのステップS301,S302において、測位装置20及び地図情報処理装置30によるローカライゼーションの信頼度が自動運転の操舵制御可能な位置信頼度未満か否か、前後位置制御可能な視程距離未満か否かを調べる。
[路面自動運転安定車速Vd1_μ]
ステップS1Dにおける路面自動運転安定車速Vd1_μは、滑りやすい路面においても目標とするヨーレートを得るための操舵ヨーゲインを維持して操舵性能を確保することのできる車速として算出される。
10 外部環境認識装置
20 測位装置
30 地図情報処理装置
40 エンジン制御装置
50 変速機制御装置
60 ブレーキ制御装置
70 操舵制御装置
80 警報制御装置
100 走行制御装置
101 自動運転可能車速算出部
102 運転支援モード継続判断部
103 運転支援モード選択部
104 運転支援モード継続部
Claims (5)
- 手動運転モードと、ドライバによるステアリングの保舵を前提として運転支援制御を行う第1の運転支援モードと、ドライバによるステアリングの保舵を必要とすることなく運転支援制御を行う第2の運転支援モードとを備える車両の走行制御システムであって、
前記第2の運転支援モードでの走行中に走行環境の悪化のレベルを評価し、前記走行環境の悪化のレベルに基づいて前記第2の運転支援モードを継続可能な自動運転可能車速を算出する自動運転可能車速算出部と、
前記第2の運転支援モードにおける車速と前記自動運転可能車速とを比較し、前記第2の運転支援モードによる運転支援制御を継続可能か否かを判断する運転支援モード継続判断部と、
前記運転支援モード継続判断部で前記第2の運転支援モードによる運転支援制御の継続が不可と判断されたとき、前記第2の運転支援モードの車速を前記自動運転可能車速まで低減することにより前記第2の運転支援モードによる運転支援制御を継続可能とする運転支援モード継続部と
を備えることを特徴とする車両の走行制御システム。 - 手動運転モードと、ドライバによるステアリングの保舵を前提として運転支援制御を行う第1の運転支援モードと、ドライバによるステアリングの保舵を必要とすることなく運転支援制御を行う第2の運転支援モードとを備える車両の走行制御システムであって、
前記第2の運転支援モードでの走行中に走行環境の悪化のレベルを評価し、前記走行環境の悪化のレベルに基づいて前記第2の運転支援モードを継続可能な自動運転可能車速を算出する自動運転可能車速算出部と、
前記第2の運転支援モードにおける車速と前記自動運転可能車速とを比較し、前記第2の運転支援モードによる運転支援制御を継続可能か否かを判断する運転支援モード継続判断部と、
前記運転支援モード継続判断部で前記第2の運転支援モードによる運転支援制御の継続が不可と判断されたとき、前記第2の運転支援モードの継続と前記第1の運転支援モードへの遷移との何れかを選択可能とする運転支援モード選択部と、
前記運転支援モード選択部で前記第2の運転支援モードの継続が選択されたとき、前記運転支援モードの車速を前記自動運転可能車速まで低減することにより前記第2の運転支援モードによる運転支援制御を継続可能とする運転支援モード継続部と
を備えることを特徴とする車両の走行制御システム。 - 前記自動運転可能車速算出部は、前記走行環境の悪化のレベルを、天候状態、路面状態、車両制御状態の変化から評価することを特徴とする請求項1又は2に記載の車両の走行制御システム。
- 前記運転支援モード選択部は、ドライバがステアリングを保舵したことを検出したとき、前記第1の運転支援モードが選択されたと判断して、前記第2の運転支援モードから前記第1の運転支援モードに遷移させることを特徴とする請求項2に記載の車両の走行制御システム。
- 前記運転支援モード継続部は、前記自動運転可能車速が予め定められた下限車速を下回ったとき、前記手動運転モード若しくは車両を安全な場所に自動的に停止させる自動停車モードに遷移させることを特徴とする請求項1又は2に記載の車両の走行制御システム。
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