JP6831605B2 - 運転者状態検知装置 - Google Patents
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Description
特許文献2:特開平11−326084号公報
また、本発明の運転状態検知装置は、重心移動量検出部で検出され記運転者の体の重心移動量とフィルタ係数との畳み込みにより得られるフィルタ出力と、加速度センサで得られた車両の加速度との差分を示す誤差信号との値が小さくなるようにフィルタ係数を更新する適応フィルタを含んだ誤差信号生成部と、を備え、車両の加速度と運転者の重心移動量とのずれ量は、適応フィルタのフィルタ出力又は前記誤差信号の値によって示されることを特徴としている。
まず、図1を参照して、本実施形態に係る運転者状態検知装置の概略構成について説明する。図1は、本実施形態の運転者状態検知装置100の概略構成を示すブロック図である。運転者状態検知装置100は、図1に示すように、加速度センサ1、姿勢センサ2(重心移動量検出部の一例)、重心移動量算出部3(重心移動量検出部の一例)、誤差信号生成部4及びドライバ状態判定部5(運転者状態判定部の一例)を備える。
次に、図2を参照して、加速度センサ1及び姿勢センサ2の車両Vへの実装例について説明する。図2は、加速度センサ1及び姿勢センサ2の車両Vへの実装例を示す車両内部の上面図である。図2に示すように、車両Vには、ハンドルSwを操作するドライバDが着席するシートSt1、助手席のシートSt2及び後部座席のシートSt3が設けられる。
次に、図3を参照して、姿勢センサ2の構成例について説明する。図3は、姿勢センサ2の構成例を示す概略図である。姿勢センサ2は、フィルム型の4つの圧電センサ2a〜2dで構成される。4つの圧電センサ2a〜2dは、それぞれ、ドライバDが着座するシートSt1(車両を構成する部品の一例)の座面の座標平面を4つに分割して得られる各領域に配置される。
次に、誤差信号生成部4の構成例について説明する。誤差信号生成部4は、X方向誤差信号生成部40x及びY方向誤差信号生成部40yを有するが、いずれも構成は同じであるため、ここではX方向誤差信号生成部40xを例に挙げて説明する。図4は、X方向誤差信号生成部40xの構成例を示すブロック図である。図4に示すように、X方向誤差信号生成部40xは、適応フィルタ41x、遅延回路部42x、減算器43x、ピークホールド回路部44x及び平均値算出部45xを備える。
次に、図5を参照して、ドライバ状態判定部5の構成例について説明する。図5は、ドライバ状態判定部5の構成例を示すブロック図である。ドライバ状態判定部5は、図5に示すように、X方向ゲイン調整部51x、Y方向ゲイン調整部51y、加算器52及び閾値比較部53を備える。
上記実施形態では、加速度センサ1で得られた車両Vの加速度Gと、姿勢センサ2及び重心移動量算出部3で検出されたドライバDの重心移動量gとのずれ量の大きさを、ドライバ状態判定部5が閾値と比較することによって、ドライバDの状態を判定する。車両Vの加速度Gと、ドライバDの体の重心の移動量gとのずれ量を示す誤差信号Oは、上述したように、人間の平衡感覚に基づいて行われる位置制御の伝達特性を表す値であると考えられる。つまり、上記実施形態によれば、人間の位置制御の伝達特性を示す誤差信号Oの値の大きさに基づいて、疲労や居眠り等のドライバDの状態を精度良く検知することができる。
上記実施形態では、誤差信号生成部4がX方向誤差信号生成部40X及びY方向誤差信号生成部40Yを備え、それぞれがX方向における誤差信号OxとY方向における誤差信号Oyとを別々に生成する例を挙げたが、本発明はこれに限定されない。例えば、重心移動量算出部3において、重心移動量gx及び重心移動量gyを加算して重心移動量g′を生成し、この重心移動量g′に基づいて誤差信号生成部4が誤差信号Oを生成するように構成してもよい。重心移動量g′は、例えば下記の式1により算出することができる。
Claims (7)
- 車両に取り付けた加速度センサと、
前記車両を構成する部品に取り付けられ、前記車両に搭乗している運転者の体の重心移動量を検出する重心移動量検出部と、
前記加速度センサで得られた前記車両の加速度と、前記重心移動量検出部で検出された前記運転者の体の重心移動量とのずれ量の大きさに基づいて、前記運転者の状態を判定する運転者状態判定部と、
前記重心移動量検出部で検出された前記運転者の体の重心移動量とフィルタ係数との畳み込みにより得られるフィルタ出力と、前記加速度センサで得られた前記車両の加速度との差分を示す誤差信号との値が小さくなるようにフィルタ係数を更新する適応フィルタを含んだ誤差信号生成部と、を備え、
前記車両の加速度と前記運転者の重心移動量とのずれ量は、前記適応フィルタのフィルタ出力又は前記誤差信号の値によって示される、
運転者状態検知装置。 - 前記重心移動量検出部は、
前記車両の運転席の座面に設けられて、前記運転者が前記運転席に着座することにより加わる圧力に応じた電圧を出力する姿勢センサと、
前記姿勢センサの出力値から、前記運転者の前記重心移動量を算出する重心移動量算出部と、を有する
請求項1に記載の運転者状態検知装置。 - 前記姿勢センサは、
前記運転席の座面の座標平面を4つに分割した各領域に配置される4つのフィルム型の圧電センサであり、前記座標平面におけるX軸は前記車両の車幅方向に対応し、前記座標平面におけるY軸は前記車両の長さ方向に対応し、
前記重心移動量算出部は、前記圧電センサの前記座標平面における配置位置の情報及び前記圧電センサの出力値を用いて、前記運転者の重心移動量を算出する
請求項2に記載の運転者状態検知装置。 - 前記重心移動量検出部は、
前記運転者が着用するシートベルトに設けられ、前記運転者の体の動きをドプラーセンシングによって検出する電波センサを備える
請求項1に記載の運転者状態検知装置。 - 前記重心移動量検出部は、
前記運転者が着用するシートベルトに設けられ、前記運転者の体により加わる圧力の増加に伴い電気的抵抗値が減少する特性を有する高分子厚膜センサを備える
請求項1に記載の運転者状態検知装置。 - 前記重心移動量検出部は、
前記運転者が着用するシートベルトに設けられ、前記運転者の体の動きを振動の大きさとして検出する微小振動検出マイクを備える
請求項1に記載の運転者状態検知装置。 - 前記重心移動量検出部は、
前記運転者の体に装着される加速度センサを備える
請求項1に記載の運転者状態検知装置。
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JP2020146235A (ja) * | 2019-03-13 | 2020-09-17 | 日本電産モビリティ株式会社 | 生体情報出力装置、生体情報出力方法、生体情報出力プログラムおよび記録媒体 |
JP7415846B2 (ja) * | 2020-08-11 | 2024-01-17 | 株式会社デンソー | 物体検出装置および物体検出方法 |
CN113967014B (zh) * | 2021-12-22 | 2022-04-08 | 成都航空职业技术学院 | 基于大数据的学生行为分析装置、***及方法 |
CN114537323A (zh) * | 2022-03-04 | 2022-05-27 | 浙江吉利控股集团有限公司 | 一种安全带及其安全带佩戴识别方法和装置 |
CN116129409B (zh) * | 2023-04-11 | 2023-06-27 | 钧捷智能(深圳)有限公司 | 一种基于运动分析的驾驶员监测方法及*** |
CN116616721B (zh) * | 2023-07-24 | 2023-10-13 | 北京中科心研科技有限公司 | 一种基于ppg信号的作息信息确定方法、装置及可穿戴设备 |
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JPH11326084A (ja) * | 1998-05-12 | 1999-11-26 | Isuzu Motors Ltd | ドライバ状態検出装置 |
JP3090782U (ja) * | 2002-06-17 | 2002-12-26 | コスモシステム開発株式会社 | 動作解析装置 |
EP1607043B1 (en) * | 2003-02-24 | 2012-09-26 | Michiko Takaoka | Psychosomatic state determination system |
US20090174560A1 (en) * | 2008-01-03 | 2009-07-09 | General Electric Company | Systems, Apparatuses And Methods For Monitoring Physical Conditions Of A Vehicle Driver |
JP4924489B2 (ja) * | 2008-03-10 | 2012-04-25 | 株式会社デンソー | 状態推定装置 |
JP4591541B2 (ja) * | 2008-05-14 | 2010-12-01 | 横浜ゴム株式会社 | 車両の走行条件評価方法及びその評価装置 |
CN102407805A (zh) * | 2010-09-20 | 2012-04-11 | 天津职业技术师范大学 | 汽车驾驶员状态实时监测*** |
JP2012166579A (ja) * | 2011-02-09 | 2012-09-06 | Aisin Seiki Co Ltd | 状態判定装置、状態判定方法及びプログラム |
JP2012252632A (ja) * | 2011-06-06 | 2012-12-20 | Nippon Seiki Co Ltd | 運転者監視装置 |
WO2013042530A1 (ja) * | 2011-09-22 | 2013-03-28 | Necカシオモバイルコミュニケーションズ株式会社 | 表示装置、表示制御方法およびプログラム |
JP2013069184A (ja) * | 2011-09-26 | 2013-04-18 | Nippon Seiki Co Ltd | 車両運転者状態判定装置及び車両運転者状態判定方法 |
CN104952210B (zh) * | 2015-05-15 | 2018-01-05 | 南京邮电大学 | 一种基于决策级数据融合的疲劳驾驶状态检测***和方法 |
CN105405253B (zh) * | 2015-12-18 | 2017-05-24 | 中交第一公路勘察设计研究院有限公司 | 一种驾驶员疲劳状态的监测方法及监测装置 |
CN205541297U (zh) * | 2016-04-07 | 2016-08-31 | 深圳市云传智联技术有限公司 | 疲劳驾驶预警***及装置 |
JP6323511B2 (ja) * | 2016-08-26 | 2018-05-16 | マツダ株式会社 | 運転者体調検知装置及び方法 |
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US20210101604A1 (en) | 2021-04-08 |
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