JP2011254633A - 共鳴型非接触受電装置の位置決め支援装置および共鳴型非接触受電装置の位置決め方法 - Google Patents
共鳴型非接触受電装置の位置決め支援装置および共鳴型非接触受電装置の位置決め方法 Download PDFInfo
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Abstract
【解決手段】制御装置180は、自己共振コイル112の位置の検出開始後の初期段階に、位相検波器116で測定した測定値をメモリ181に記録し、メモリ181に記録した測定値に対して現在位相検波器116で測定した測定値の符号が反転するまで初期段階よりも自己共振コイルの位置を目標方向に移動させるための制御を実行し、位相検波器116で測定した測定値の符号が反転してから受電電圧センサ190で測定した受電電圧VRに基づいて自己共振コイル112の位置合わせを行なうための制御を実行する。
【選択図】図5
Description
図2を参照して、車両用給電システム10は、車両100と、給電装置200とを備える。車両100は、受電ユニット110と、カメラ120と、通信ユニット130とを含む。
図3を参照して、この共鳴法では、2つの音叉が共鳴するのと同様に、同じ固有振動数を有する2つのLC共振コイルが電磁場(近接場)において共鳴することによって、一方のコイルから他方のコイルへ電磁場を介して電力が伝送される。
図4を参照して、電磁界は3つの成分を含む。曲線k1は、波源からの距離に反比例した成分であり、「輻射電磁界」と称される。曲線k2は、波源からの距離の2乗に反比例した成分であり、「誘導電磁界」と称される。また、曲線k3は、波源からの距離の3乗に反比例した成分であり、「静電磁界」と称される。
図6を参照して、制御装置180は、IPA(Intelligent Parking Assist)−ECU(Electronic Control Unit)410と、EPS(Electric Power Steering)420と、MG(Motor-Generator)−ECU430と、ECB(Electronically Controlled Brake)440と、EPB(Electric Parking Brake)450と、共鳴ECU460と、HV(Hybrid Vehicle)−ECU470と、記憶部471とを含む。記憶部471は、図5に示すメモリ181に対応するものであり、いずれかのECUに内蔵されるメモリであっても良い。
図10は、ズレ量D=0のときの自己共振コイルの周囲の磁界を示した図である。
図12は、ズレ量D=D1のときの自己共振コイルの周囲の磁界を示した図である。
図14は、ズレ量D=D2のときの自己共振コイルの周囲の磁界を示した図である。
図16は、ズレ量D=D3のときの自己共振コイルの周囲の磁界を示した図である。
図19を参照して、位相検波器116は、二次自己共振コイル112で受電され、二次コイル114に伝達された微弱電力に起因する受信信号を受ける入力ノード502と、参照信号を発生する信号源504と、参照信号と受信信号とが入力される掛算器506と、掛算器506の出力を受けるローパスフィルタ(LPF)508とを含む。信号源504が発生する参照信号は、入力信号と周波数が等しく、位相が固定された信号である。
sinα・sinβ=(cos(α−β)−cos(α+β))/2
ここで、位相が一致するとα=βであるので、これを代入すると式の右辺は(cos(0)−cos(2α))/2=(1−cos(2α))/2となる。これは、入力信号の振幅に比例した直流分と、入力信号の周波数の2倍の周波数の交流分である。交流分をローパスフィルタで除去すると、直流分が得られることになる。なお、参照信号は方形波であっても良く、一般的なアナログ式ロックアンプでは、参照信号に方形波が採用され、掛算器として入力信号の正転および反転信号を方形波に応じて切り替えるスイッチが採用されることもある。
Claims (6)
- 共鳴法によって電力を受電する自己共振コイルに生じる電流の位相を測定するための位相測定部と、
前記自己共振コイルの受電電圧を測定するための受電電圧測定部と、
前記位相および前記受電電圧を記録する記録部と、
前記自己共振コイルの位置決め制御を実行する制御部とを備え、
前記制御部は、前記自己共振コイルの位置の検出開始後の初期段階に前記位相測定部で測定した測定値を前記記録部に記録し、前記記録部に記録した測定値に対して現在前記位相測定部で測定した測定値の符号が反転するまで前記初期段階よりも前記自己共振コイルの位置を目標方向に移動させるための制御を実行し、前記位相測定部で測定した測定値の符号が反転してから前記受電電圧測定部で測定した受電電圧に基づいて前記自己共振コイルの位置合わせを行なうための制御を実行する、共鳴型非接触受電装置の位置決め支援装置。 - 前記自己共振コイルは車両に搭載され、
前記制御部は、前記自己共振コイルの位置を前記目標方向に移動させるために、前記車両の駆動輪を駆動する、請求項1に記載の共鳴型非接触受電装置の位置決め支援装置。 - 前記自己共振コイルは車両に搭載され、
前記制御部は、前記自己共振コイルの位置を前記目標方向に移動させるために、運転者に車両の移動方向を指示する、請求項1に記載の共鳴型非接触受電装置の位置決め支援装置。 - 前記制御部が前記記録部に記録する前記測定値は、少なくとも前記自己共振コイルの直径の半分より大きい距離だけ前記自己共振コイルが目標位置から遠ざかっている時に測定された値である、請求項1〜3のいずれか1項に記載の共鳴型非接触受電装置の位置決め支援装置。
- 車両の周囲状況を撮影するカメラをさらに備え、
前記制御部は、前記カメラで撮影された映像に基づいて、前記自己共振コイルの位置を目標位置に近づけてから、前記位相測定部および前記受電電圧測定部の測定結果に基づいて前記自己共振コイルの位置の微調整を行なう、請求項1〜4のいずれか1項に記載の共鳴型非接触受電装置の位置決め支援装置。 - 自己共振コイルを含む共鳴型非接触受電装置の位置決め方法であって、
前記自己共振コイルの位置の検出開始後の初期段階に自己共振コイルに生じる電流の位相を測定して記録するステップと、
前記記録するステップで記録した測定値に対して現在測定した電流の位相の測定値の符号が反転するまで前記初期段階よりも前記自己共振コイルの位置を目標方向に移動させるための制御を実行するステップと、
測定した電流の位相の符号が反転してから前記自己共振コイルの受電電圧に基づいて前記自己共振コイルの位置合わせを行なうための制御を実行するステップとを備える、共鳴型非接触受電装置の位置決め方法。
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