JP7275847B2 - 車両制御装置 - Google Patents
車両制御装置 Download PDFInfo
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- JP7275847B2 JP7275847B2 JP2019095301A JP2019095301A JP7275847B2 JP 7275847 B2 JP7275847 B2 JP 7275847B2 JP 2019095301 A JP2019095301 A JP 2019095301A JP 2019095301 A JP2019095301 A JP 2019095301A JP 7275847 B2 JP7275847 B2 JP 7275847B2
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- 230000001133 acceleration Effects 0.000 claims description 184
- 239000006096 absorbing agent Substances 0.000 claims description 118
- 230000035939 shock Effects 0.000 claims description 118
- 239000000725 suspension Substances 0.000 claims description 21
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 description 26
- 238000010586 diagram Methods 0.000 description 11
- 230000001629 suppression Effects 0.000 description 6
- 230000005484 gravity Effects 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
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- 238000000034 method Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
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Description
まず、図1を用いて、本実施形態にかかる車両制御装置を適用した車両のハードウェア構成の一例について説明する。
Wf=(W×(Lr/L))-(W×α×(H/g/L))・・・(1)
Wr=(W×(Lf/L))+(W×α×(H/g/L))・・・(2)
上記の式(1),(2)において、Wは車両1の重心点の荷重であり、Lは車両1のホイールベースであり、Lfは車両1の重心点から前輪の中心までの距離であり、Lrは車両1の重心点から後輪の中心までの距離であり、Hは車両1の重心点の高さであり、gは重力加速度であり、αは目標加減速度である。
Δxf=Wf/Kf・・・(3)
Δxr=Wr/Kr・・・(4)
上記の式(3),(4)において、Kfは車両1の前輪の緩衝器22が有するバネのばね定数(サスペンション剛性)であり、Krは車両1の後輪の緩衝器22が有するバネのばね定数(サスペンション剛性)である。
本実施形態は、車両の加速、減速、または旋回によって車両に作用する加速度が加速度センサによって検出される前に、複数の緩衝器のストローク量の差異が小さくなるように、複数の駆動装置および複数の制動装置の少なくとも一方が車輪に与えるトルクを変更する例である。以下の説明では、第1の実施形態と同様の構成については、説明を省略する。
本実施形態は、車両を減速させる場合に、車両の減速が開始される前から、車両の前後方向において、加速度方向側に存在する緩衝器の減衰力を、車両の前後方向において、非加速度方向側に存在する緩衝器の減衰力よりも大きくする例である。以下の説明では、第1,2の実施形態と同様の構成については、説明を省略する。
本実施形態は、車両が発進する場合、車両の後輪の緩衝器の減衰力が要求減衰力に達するまで、駆動装置から駆動トルクを発生させない制御または制動装置から制動トルクを発生させる制御を実行する例である。以下の説明では、第1~3の実施形態と同様の構成については、説明を省略する。
11 アクセルセンサ
12 ブレーキセンサ
13 車輪速センサ
14 前後方向加速度センサ
15 横方向加速度センサ
16 操舵角センサ
17 車高センサ
18 シフトセンサ
19 コントローラ
19a 目標制駆動力演算部
19b 目標加減速度演算部
19c 目標制駆動力分配率演算部
19d 減衰力変更判定部
19e 制御指令演算部
20 駆動装置
21 制動装置
22 緩衝器
Claims (5)
- 車両の加速または減速によって前記車両に作用する加速度が加速度センサによって検出される前に、前記車両が有する複数の緩衝器のうち、前記車両の前後方向において、前記加速度が作用する第1方向側に位置する前記緩衝器の第1減衰力を、前記複数の緩衝器のうち、前記前後方向において、前記第1方向とは反対の第2方向側に位置する前記緩衝器の第2減衰力より大きくする制御部、を備え、
前記制御部は、前記車両の目標加減速度に基づいて、前記車両の前後輪のそれぞれの軸荷重を算出し、算出した前記軸荷重に基づいて、前記前後輪の前記緩衝器のサスペンション変位量を算出し、算出した前記サスペンション変位量に基づいて、前記前後輪の前記緩衝器のストローク量の差異が小さくなるように、前記緩衝器の減衰力の変更量を算出し、算出した前記減衰力の変更量の分、前記緩衝器の減衰力を増加させる、
車両制御装置。 - 前記車両は、当該車両の車輪毎に、当該車輪にトルクを与えるモータおよび制動装置を有し、
前記制御部は、さらに、前記車両の加速または減速によって前記車両に作用する加速度が前記加速度センサによって検出される前に、前記前後方向において、前記第1方向側に位置する前記車輪の前記モータおよび前記制動装置の少なくとも一方の第1トルクを、前記前後方向において、前記第2方向側に存在する前記車輪の前記モータおよび前記制動装置の少なくとも一方の第2トルクより大きくする請求項1に記載の車両制御装置。 - 前記制御部は、前記第1減衰力が、予め設定された要求減衰力に達した際に、前記第1トルクと、前記第2トルクと、の比率を等しくする請求項2に記載の車両制御装置。
- 前記制御部は、前記緩衝器の単位時間当たりの減衰力の変更量を、前記緩衝器の単位時間当たりの減衰力の変更量の上限よりも小さくする請求項2または3に記載の車両制御装置。
- 前記制御部は、前記車両を減速させる場合、前記車両の減速が開始される前から、前記第1減衰力を、前記第2減衰力より大きくする請求項1から4のいずれか一に記載の車両制御装置。
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