JP2009207260A - モータ制御装置 - Google Patents
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Abstract
【課題】モータに電流を流すことなく、Hブリッジ回路および電流検出回路を診断するモータ制御装置を提供する。
【解決手段】スイッチング素子20、22、30、32は、モータ2の回転方向を制御するHブリッジ回路を構成している。診断制御時においてECU60は、スイッチング素子20、24、40をオンにし、その他のスイッチング素子22、30、32、34をオフにする。これにより、定電流回路42で制御された一定値の電流が、スイッチング素子20、40を通りモータ2をバイパスして流れる。ECU60は、スイッチング素子24に流れる電流値を検出し、この検出電流値と、スイッチング素子20に対して設定されたミラー比に応じてスイッチング素子24に流れると推定される推定電流値との差に基づき、スイッチング素子20、24、40、抵抗26および定電流回路42が正常であるかを診断する。
【選択図】図1
【解決手段】スイッチング素子20、22、30、32は、モータ2の回転方向を制御するHブリッジ回路を構成している。診断制御時においてECU60は、スイッチング素子20、24、40をオンにし、その他のスイッチング素子22、30、32、34をオフにする。これにより、定電流回路42で制御された一定値の電流が、スイッチング素子20、40を通りモータ2をバイパスして流れる。ECU60は、スイッチング素子24に流れる電流値を検出し、この検出電流値と、スイッチング素子20に対して設定されたミラー比に応じてスイッチング素子24に流れると推定される推定電流値との差に基づき、スイッチング素子20、24、40、抵抗26および定電流回路42が正常であるかを診断する。
【選択図】図1
Description
本発明は、モータの回転方向をHブリッジ回路で制御するモータ制御装置に関する。
従来、Hブリッジ回路によりモータに流れる電流の方向を切り替え、モータの回転方向を正転方向および逆転方向に制御するモータ制御装置において、モータに流れる電流を検出するモータ電流検出回路を設置することが知られている(例えば、特許文献1参照。)。
特許文献1では、診断制御時において、モータ電流検出回路が正常に作動するかを判定するために、Hブリッジ回路のスイッチング素子を制御して実際にモータに電流を流し、モータに対する電流指令値と、モータ電流検出回路が検出する電流検出値とを比較している。
特許第3777792号公報
しかしながら、モータ電流検出回路を診断するためにモータに電流を流すと、通常制御以外のタイミングでモータが作動するという問題がある。
そこで、モータに電流を流さずにモータ電流検出回路を診断するために、Hブリッジ回路のスイッチング素子をオフにした状態でモータ電流検出回路に診断用の電圧を印加し、そのときの電流検出値を判定することが考えられる。
そこで、モータに電流を流さずにモータ電流検出回路を診断するために、Hブリッジ回路のスイッチング素子をオフにした状態でモータ電流検出回路に診断用の電圧を印加し、そのときの電流検出値を判定することが考えられる。
しかしながら、この方式では、モータ電流検出回路の診断はできるものの、Hブリッジ回路に電流を流さないので、Hブリッジ回路を診断することができないという問題がある。
本発明は、上記問題を解決するためになされたものであり、モータに電流を流すことなく、Hブリッジ回路および電流検出回路を診断するモータ制御装置を提供することを目的とする。
請求項1から7に記載の発明によると、Hブリッジ回路の上側スイッチング素子を流れる電流を電流検出回路で検出し、電流検出回路が設置された上側スイッチング素子のオン時においてバイパス回路が通電オン状態に設定されると、電流検出回路が接続された上側スイッチング素子を流れる電流がモータをバイパスしてバイパス回路に流れる。
診断制御時にモータをバイパスして上側スイッチング素子からバイパス回路に電流が流れることにより、電流検出回路と、電流検出回路が設置されたHブリッジ回路の上側スイッチング素子とが正常に作動するかを、モータを作動させることなく電流検出回路の検出結果に基づいて診断できる。
請求項2に記載の発明によると、電流検出回路は電源に対して上側スイッチング素子と並列に接続する検出スイッチング素子を有し、検出スイッチング素子がオンに設定されることにより電流検出回路は上側スイッチング素子を流れる電流を検出する。
電源に対して上側スイッチング素子と電流検出回路の検出スイッチング素子とが並列に接続しているので、上側スイッチング素子を流れる電流値に対して検出スイッチング素子を流れる電流値を回路構成により小さくすることができる。これにより、安価な電気部品を使用して電流検出回路を構成できる。
請求項3に記載の発明によると、バイパス回路は、通電オン状態に設定されたときに電流検出回路が設置された上側スイッチング素子に一定電流値の電流を流す定電流回路を有する。
これにより、診断制御時において、定電流回路により電流検出回路に流れると推定される推定電流値は一定値である。その結果、電流検出回路と、電流検出回路が設置された上側スイッチング素子と、バイパス回路とが正常であるか、あるいは製造ばらつき、または劣化等が生じていても許容範囲内であれば、電流検出回路が診断制御時に検出する検出電流値は、推定電流値に対して所定範囲内になる。
一方、診断制御時に電流検出回路が検出する検出電流値が推定電流値に対して所定範囲からずれる場合には、電流検出回路、または電流検出回路が設置された上側スイッチング素子、またはバイパス回路に許容できない異常が発生していると判断できる。
このように、請求項3に記載の発明によると、一定値の推定電流値に対して電流検出回路が検出する検出電流値のずれを判定することにより、電流検出回路と、電流検出回路が設置された上側スイッチング素子と、バイパス回路とが正常であるか、あるいは少なくともいずれかが異常であるかを高精度に診断できる。
また、請求項3に記載の発明を請求項2に記載の発明に適用すると、電流検出回路が設置された上側スイッチング素子と電流検出回路の検出スイッチング素子とを流れる電流比が予め設定された値からずれているか否かを、診断制御時に電流検出回路が検出する検出電流値に基づいて、高精度に診断できる。
ところで、正転方向または逆転方向の一方向にモータを回転駆動するときにだけモータに流れる電流値を検出し、モータが発生するトルクを高精度に制御したい場合がある。
そこで、請求項4に記載の発明によると、電流検出回路およびバイパス回路は、正転用または逆転用の上側スイッチング素子の一方の上側スイッチング素子に設置される。
そこで、請求項4に記載の発明によると、電流検出回路およびバイパス回路は、正転用または逆転用の上側スイッチング素子の一方の上側スイッチング素子に設置される。
これにより、正転用または逆転用のうち一方用の上側スイッチング素子と、この上側スイッチング素子に設置されている電流検出回路と、バイパス回路とが正常に作動しているかを、電流検出回路の検出電流値に基づいて診断できる。
そして、通常制御時において、正転方向または逆転方向のうち一方向にモータを回転駆動するときにモータに流れる電流値を検出し、モータが発生するトルクを高精度に制御できる。
請求項5に記載の発明によると、バイパス回路は、診断スイッチング素子により通電状態を切り替える。これにより、簡単な構成でバイパス回路の通電状態を切り替えることができる。
請求項7に記載の発明によると、モータ制御装置は、シートベルトの引き込み、および引き込み解除用のモータに流れる電流を制御する。
これにより、モータに対する通常制御時においては、車両等の搭乗者が体に掛けるシートベルトの引き込み、および引き込み解除を行うモータに流れる電流を検出し、検出結果に基づいてモータが発生するトルクを制御できる。
これにより、モータに対する通常制御時においては、車両等の搭乗者が体に掛けるシートベルトの引き込み、および引き込み解除を行うモータに流れる電流を検出し、検出結果に基づいてモータが発生するトルクを制御できる。
また、診断制御時においては、電流検出回路と、電流検出回路が設置されたHブリッジ回路の上側スイッチング素子と、バイパス回路とが正常に作動するかを、モータを作動させず、つまりシートベルトを動かすことなく電流検出回路の検出結果に基づいて診断できる。
尚、本発明に備わる手段の機能は、構成自体で機能が特定されるハードウェア資源、プログラムにより機能が特定されるハードウェア資源、またはそれらの組み合わせにより実現される。
以下、本発明の実施の形態を図に基づいて説明する。
[第1実施形態]
本発明の第1実施形態によるモータ制御装置を図1に示す。
[第1実施形態]
本発明の第1実施形態によるモータ制御装置を図1に示す。
(モータ制御装置10)
モータ制御装置10は、シートベルトの引き込み、および引き込み解除用のモータ2に流れる電流を制御する。モータ2は直流電動機である。
モータ制御装置10は、シートベルトの引き込み、および引き込み解除用のモータ2に流れる電流を制御する。モータ2は直流電動機である。
スイッチング素子20、22、24、30、32、34、40は、例えばMOSFET(metal-oxide-semiconductor field-effect transistor)により形成されている。これらスイッチング素子のうち、スイッチング素子20、22、30、32はHブリッジ回路を構成している。電源とモータ2との間に設置されるスイッチング素子20、30を上側スイッチング素子、モータ2と接地側との間に設置されるスイッチング素子22、32を下側スイッチング素子ともいう。
Hブリッジ回路のスイッチング素子20、22、30、32のオン、オフが電子制御装置(Electronic Control Unit;ECU)60により制御されることにより、モータ2に流れる電流の向きが切り替わり、モータ2は正転方向または逆転方向に回転する。スイッチング素子20およびスイッチング素子24のゲートライン、ならびにスイッチング素子30およびスイッチング素子34のゲートラインはそれぞれ共通であるから、スイッチング素子20およびスイッチング素子24のオン、オフ状態、ならびにスイッチング素子30およびスイッチング素子34のオン、オフ状態はそれぞれ同一である。
スイッチング素子20、22がオンになり、スイッチング素子30、32がオフになると、モータ2は正転方向に回転する(図2参照)。モータ2が正転方向に回転すると、シートベルトは引き込まれる。
一方、スイッチング素子20、22がオフになり、スイッチング素子30、32がオンになると、モータ2は正転方向に対し逆転方向に回転する(図2参照)。モータ2が逆転方向に回転すると、シートベルトの引き込みは解除される。
スイッチング素子20およびスイッチング素子24、ならびにスイッチング素子30およびスイッチング素子34は、それぞれ1個の同じ半導体チップで形成されており、それぞれ電源に対して並列に接続される。
そして、スイッチング素子20およびスイッチング素子24、ならびにスイッチング素子30およびスイッチング素子34は、ECU60からのスイッチング信号により、同じタイミングでオン、オフを切り替えられる。スイッチング素子20とスイッチング素子24、ならびにスイッチング素子30とスイッチング素子34とは、それぞれオン状態になったときに、例えば4000〜5000対1の所定の比率(ミラー比)で電流が流れるように形成されている。尚、第1実施形態では、スイッチング素子34は使用されていない。
スイッチング素子24および抵抗26は電流検出回路を構成している。スイッチング素子24は、正転用のスイッチング素子20に流れる電流を検出するために設置された検出スイッチング素子である。抵抗26は、スイッチング素子24を流れる電流を電圧に変換しECU60が検出できるように設置されている。抵抗26で変換された電圧は、実際にはアンプ等で増幅されてECU60に入力される。
前述したように、スイッチング素子20とスイッチング素子24とは、オン状態になったときに4000〜5000対1の所定の比率(ミラー比)で電流が流れるように形成されているので、抵抗26を流れる電流値は非常に小さい。したがって、抵抗26として安価な部品を使用できる。
第1実施形態においては、正転用のスイッチング素子20だけに電流検出回路を設置し、逆転用のスイッチング素子30に電流検出回路を設置していない。これは、正転用のスイッチング素子20に流れる電流値を検出し、検出した電流値に基づいてモータ2に流れる電流値を制御することにより、モータ2が正転方向に回転しシートベルトが引き込まれるときに、過度の力が搭乗者に加わることを防止するためである。
一方、逆転用のスイッチング素子30は、シートベルトの引き込みを解除し搭乗者に加わる力を弱める方向にモータ2に電流を流すので、検出した電流値に基づいてモータ2に流れる電流値を制御することは不要であると考えられるからである。
スイッチング素子40および定電流回路42はバイパス回路を構成している。スイッチング素子40は、正転用のHブリッジ回路および電流検出回路の診断用に設置された診断スイッチング素子である。診断制御時には、スイッチング素子20、24、40がオン、その他のスイッチング素子22、30、32、34がオフに設定される。
スイッチング素子20がオンであってもスイッチング素子22がオフであるからモータ2に電流は流れず、モータ2をバイパスしてスイッチング素子20およびスイッチング素子40に電流が流れる。このとき、スイッチング素子24には、スイッチング素子20に対して設定されたミラー比の電流が流れる。
定電流回路42は、スイッチング素子20、40がオンされたときに、モータ2をバイパスして一定値の電流をスイッチング素子20に流す。
抵抗50、52は、それぞれスイッチング素子20、22に並列に接続しており、診断制御時に、スイッチング素子22、またはスイッチング素子20、22のオン、オフが正常に切り替わるかを診断するために設置されている。抵抗50、52の抵抗値は、モータ2に電流を流す通常制御時に抵抗50、52に電流が殆ど流れない値に設定されている。
抵抗50、52は、それぞれスイッチング素子20、22に並列に接続しており、診断制御時に、スイッチング素子22、またはスイッチング素子20、22のオン、オフが正常に切り替わるかを診断するために設置されている。抵抗50、52の抵抗値は、モータ2に電流を流す通常制御時に抵抗50、52に電流が殆ど流れない値に設定されている。
ECU60は、CPU、ROM、RAM、フラッシュメモリ等から構成されたマイクロコンピュータである。ECU60は、ROMまたはフラッシュメモリに記憶された制御プログラムにより、スイッチング素子20、22、24、30、32、34、40のオン、オフを切り替える切替制御手段として機能する。
(通常制御)
ECU60は、モータ電流の通常制御時において、車両の走行状態または車両周囲の走行環境に基づいて、図2に示すようにHブリッジ回路を構成するスイッチング素子20、22、30、32のオン、オフを切り替えることにより、モータ2を正転または逆転させてシートベルトの引き込み、または引き込み解除を制御する。シートベルトの引き込み、または引き込み解除を制御する場合、ECU60は、車両の走行状態または車両周囲の走行環境に基づいて、モータ2に流す電流値を調整してもよい。
ECU60は、モータ電流の通常制御時において、車両の走行状態または車両周囲の走行環境に基づいて、図2に示すようにHブリッジ回路を構成するスイッチング素子20、22、30、32のオン、オフを切り替えることにより、モータ2を正転または逆転させてシートベルトの引き込み、または引き込み解除を制御する。シートベルトの引き込み、または引き込み解除を制御する場合、ECU60は、車両の走行状態または車両周囲の走行環境に基づいて、モータ2に流す電流値を調整してもよい。
また、ECU60は、スイッチング素子20、22をオンにしてモータ2を正転させてシートベルトを引き込むとき、電流検出回路を構成するスイッチング素子24に流れる電流を検出し、検出した電流値とミラー比とに基づいてスイッチング素子20からモータ2に流れるモータ電流を検出する。
そして、ECU60は、検出したモータ電流検出値と、モータ2に流す電流値を指令するモータ電流指令値との差が所定範囲内であれば、モータ電流検出値とモータ電流指令値との差に基づいてモータ電流指令値をフィードバック制御する。このとき、Hブリッジ回路および電流検出回路が正常であり、スイッチング素子20に対して設定されたミラー比の電流がスイッチング素子24に流れるのであれば、ECU60は、モータ電流検出値とモータ電流指令値との差に基づいてモータ電流指令値を高精度にフィードバック制御できる。
これに対し、検出したモータ電流値とモータ電流指令値との差が所定範囲を超えると、ECU60は、Hブリッジ回路に異常が発生していると判断し、モータ2に対する電流制御を停止するとともに、警告灯または警告音により異常を報知する。
このように、ECU60は、モータ2に流す電流値を制御する電流制御手段としても機能する。
(診断制御)
通常制御時において、電流検出回路で検出したモータ電流検出値に基づいてモータ電流指令値をフィードバック制御するためには、電流検出回路およびHブリッジ回路が正常に作動している必要がある。
(診断制御)
通常制御時において、電流検出回路で検出したモータ電流検出値に基づいてモータ電流指令値をフィードバック制御するためには、電流検出回路およびHブリッジ回路が正常に作動している必要がある。
そこで、ECU60は、例えばエンジン始動時、あるいは所定の走行距離毎においてシートベルトの引き込み、および引き込み解除制御が不要なときに、電流検出回路およびHブリッジ回路が正常に作動しているかを診断する。
正転用の診断制御時においてECU60は、図2に示すようにスイッチング素子20、24、40をオンにし、その他のスイッチング素子22、30、32、34をオフにする。これにより、定電流回路42で制御された一定値の電流が、スイッチング素子20、40を通りモータ2をバイパスして流れる。スイッチング素子40および定電流回路42を有するバイパス回路の通電状態を診断スイッチング素子としてのスイッチング素子40が切り替えるので、簡単な構成でバイパス回路の通電状態を切り替えることができる。
ECU60は、スイッチング素子24に流れる電流値を検出し、この検出電流値と、スイッチング素子20に対して設定されたミラー比に応じてスイッチング素子24に流れると推定される推定電流値との差が所定範囲内であれば、スイッチング素子20、24、40、抵抗26および定電流回路42が正常であると判断する。
一方、ECU60は、スイッチング素子24に流れる電流値を検出し、この検出電流値と、スイッチング素子24に流れると推定される推定電流値との差が所定範囲からずれていると、スイッチング素子20、24、40、抵抗26および定電流回路42の少なくともいずれかが異常であると判断する。
スイッチング素子20が異常の場合、ECU60は、モータ電流を正常に制御できない。したがって、ECU60は、診断制御時において異常を検出すると、スイッチング素子20の異常の可能性があるので、モータ電流の制御を停止するとともに、警告灯または警告音により異常を報知する。
尚、モータ2をバイパスして電流を流す正転用の診断制御を実施する前に、ECU60は、スイッチング素子20以外のスイッチング素子をオフにした状態でスイッチング素子20のオン、オフを切り替えることにより、スイッチング素子20のスイッチング作動を診断してもよい。ECU60は、スイッチング素子20のオン、オフを切り替えたときに、例えば抵抗52のモータ側の電圧を検出することにより、スイッチング素子20のオン、オフが正常に切り替わっているかを判定できる。
スイッチング素子20のスイッチング作動が異常であれば、ECU60は、モータ2をバイパスして電流を流す正転用の診断制御を実施せず、モータ電流の制御を停止するとともに、警告灯または警告音により異常を報知する。
スイッチング素子20のスイッチング作動が正常であれば、ECU60は、モータ2をバイパスして電流を流す正転用の診断制御を実施する。
また、ECU60は、正転用の診断制御時においてスイッチング素子22以外のスイッチング素子をオフにした状態でスイッチング素子22のオン、オフを切り替えることにより、スイッチング素子20と対になってモータ2に電流を流すスイッチング素子22のスイッチング作動を診断する。ECU60は、スイッチング素子22のオン、オフを切り替えたときに抵抗52のモータ側の電圧を検出することにより、スイッチング素子22のオン、オフが正常に切り替わっているかを判定する。
また、ECU60は、正転用の診断制御時においてスイッチング素子22以外のスイッチング素子をオフにした状態でスイッチング素子22のオン、オフを切り替えることにより、スイッチング素子20と対になってモータ2に電流を流すスイッチング素子22のスイッチング作動を診断する。ECU60は、スイッチング素子22のオン、オフを切り替えたときに抵抗52のモータ側の電圧を検出することにより、スイッチング素子22のオン、オフが正常に切り替わっているかを判定する。
スイッチング素子22のスイッチング作動が異常であれば、ECU60は、モータ電流の制御を停止するとともに、警告灯または警告音により異常を報知する。
[第2実施形態]
本発明の第2実施形態によるモータ制御装置を図3に示す。図3では、下側のスイッチング素子22、32のスイッチング作動を診断するためにスイッチング素子20、22、30、32にそれぞれ並列に接続している抵抗(図1の抵抗50、52に相当する。)の図示を省略している。尚、第1実施形態と実質的に同一構成部分には同一符号を付す。
[第2実施形態]
本発明の第2実施形態によるモータ制御装置を図3に示す。図3では、下側のスイッチング素子22、32のスイッチング作動を診断するためにスイッチング素子20、22、30、32にそれぞれ並列に接続している抵抗(図1の抵抗50、52に相当する。)の図示を省略している。尚、第1実施形態と実質的に同一構成部分には同一符号を付す。
図3に示すモータ制御装置70では、抵抗36、スイッチング素子80および定電流回路82が、図1に示すモータ制御装置10に追加されている。この構成により、第2実施形態では、モータ2の正転および逆転の両方向において、通常制御時のフィードバック制御とHブリッジ回路および電流検出回路の異常検出、ならびに診断制御時におけるHブリッジ回路および電流検出回路の診断を実施する。
スイッチング素子34および抵抗36は電流検出回路を構成している。スイッチング素子34は、逆転用のスイッチング素子30に流れる電流を検出する検出スイッチング素子である。
スイッチング素子80および定電流回路82はバイパス回路を構成している。スイッチング素子80は、逆転用のHブリッジ回路および電流検出回路の診断用に設置された診断スイッチング素子である。
切替制御手段としてのECU90は、第1実施形態のECU60において、逆転用の通常制御および診断制御を実施する制御プログラムが追加されたものである。
(通常制御)
通常制御である正転制御および逆転制御の両方において、ECU90は、検出したモータ電流検出値と、モータ2に流す電流値を指令するモータ電流指令値との差が所定範囲内であれば、モータ電流検出値とモータ電流指令値との差に基づいてモータ電流指令値をフィードバック制御する。このとき、Hブリッジ回路および電流検出回路が正常であり、スイッチング素子20、30に対して設定されたミラー比の電流がスイッチング素子24、34にそれぞれ流れるのであれば、ECU90は、モータ電流検出値とモータ電流指令値との差に基づいてモータ電流指令値を高精度にフィードバック制御できる。
(通常制御)
通常制御である正転制御および逆転制御の両方において、ECU90は、検出したモータ電流検出値と、モータ2に流す電流値を指令するモータ電流指令値との差が所定範囲内であれば、モータ電流検出値とモータ電流指令値との差に基づいてモータ電流指令値をフィードバック制御する。このとき、Hブリッジ回路および電流検出回路が正常であり、スイッチング素子20、30に対して設定されたミラー比の電流がスイッチング素子24、34にそれぞれ流れるのであれば、ECU90は、モータ電流検出値とモータ電流指令値との差に基づいてモータ電流指令値を高精度にフィードバック制御できる。
これに対し、検出したモータ電流値とモータ電流指令値との差が所定範囲を超えると、ECU90は、Hブリッジ回路の異常であると判断し、モータ2に対する電流制御を停止するとともに、警告灯または警告音により異常を報知する。
(診断制御)
診断制御時において、ECU90は、正転用のHブリッジ回路のスイッチング素子20、22と、その電流検出回路であるスイッチング素子24および抵抗26の診断に加え、逆転用のHブリッジ回路のスイッチング素子30、32と、その電流検出回路であるスイッチング素子34および抵抗36を診断する。正転用の診断制御は、第1実施形態と実質的に同一であるから説明を省略する。
診断制御時において、ECU90は、正転用のHブリッジ回路のスイッチング素子20、22と、その電流検出回路であるスイッチング素子24および抵抗26の診断に加え、逆転用のHブリッジ回路のスイッチング素子30、32と、その電流検出回路であるスイッチング素子34および抵抗36を診断する。正転用の診断制御は、第1実施形態と実質的に同一であるから説明を省略する。
逆転用の回路の診断制御時において、ECU90は、図4に示すようにスイッチング素子30、34、80をオンにし、その他のスイッチング素子20、22、24、32、40をオフにする。これにより、定電流回路82で制御された一定値の電流が、スイッチング素子30、80を通りモータ2をバイパスして流れる。
そして、ECU90は、スイッチング素子34に流れる電流値を検出し、この検出電流値と、スイッチング素子34に流れると推定される推定電流値との差が所定範囲からずれていると、スイッチング素子30、34、80、抵抗36および定電流回路82の少なくともいずれかが異常であると判断する。スイッチング素子30が異常の場合、ECU90は、逆転時にモータ電流を正常に制御できない。
したがって、ECU90は、逆転用の診断制御時において異常を検出すると、スイッチング素子30が異常の可能性があるので、モータ電流の制御を停止するとともに、警告灯または警告音により異常を報知する。
尚、モータ2をバイパスして電流を流す逆転用の診断制御を実施する前に、ECU90は、スイッチング素子30以外のスイッチング素子をオフにした状態でスイッチング素子30のオン、オフを切り替えることにより、スイッチング素子30のスイッチング作動を診断してもよい。ECU90は、スイッチング素子30のオン、オフを切り替えたときに、スイッチング素子30およびスイッチング素子32にそれぞれ並列に接続された抵抗の、例えばスイッチング素子32に並列に接続している抵抗のモータ2側の電圧を検出することにより、スイッチング素子30のオン、オフが正常に切り替わっているかを判定できる。
スイッチング素子30のスイッチング作動が異常であれば、ECU90は、モータ2をバイパスして電流を流す逆転用の診断制御を実施せず、モータ電流の制御を停止するとともに、警告灯または警告音により異常を報知する。
スイッチング素子30のスイッチング作動が正常であれば、ECU90は、モータ2をバイパスして電流を流す逆転用の診断制御を実施する。
また、ECU90は、逆転用の診断制御時においてスイッチング素子32以外のスイッチング素子をオフにした状態でスイッチング素子32のオン、オフを切り替えることにより、スイッチング素子30と対になってモータ2に電流を流すスイッチング素子32のスイッチング作動を診断する。ECU90は、スイッチング素子32のオン、オフを切り替えたときに、スイッチング素子32に並列に接続している前述した抵抗のモータ2側の電圧を検出することにより、スイッチング素子32のオン、オフが正常に切り替わっているかを判定する。
また、ECU90は、逆転用の診断制御時においてスイッチング素子32以外のスイッチング素子をオフにした状態でスイッチング素子32のオン、オフを切り替えることにより、スイッチング素子30と対になってモータ2に電流を流すスイッチング素子32のスイッチング作動を診断する。ECU90は、スイッチング素子32のオン、オフを切り替えたときに、スイッチング素子32に並列に接続している前述した抵抗のモータ2側の電圧を検出することにより、スイッチング素子32のオン、オフが正常に切り替わっているかを判定する。
スイッチング素子32のスイッチング作動が異常であれば、ECU90は、モータ電流の制御を停止するとともに、警告灯または警告音により異常を報知する。
以上説明した上記複数の実施形態によると、モータ2に電流を流さずにHブリッジ回路および電流検出回路を診断できる。これにより、シートベルトを動かさず、搭乗者に感知されることなく診断を実施できる。
以上説明した上記複数の実施形態によると、モータ2に電流を流さずにHブリッジ回路および電流検出回路を診断できる。これにより、シートベルトを動かさず、搭乗者に感知されることなく診断を実施できる。
[他の実施形態]
上記実施形態では、シートベルトの引き込み、および引き込み解除用に使用されるモータ2の制御装置について説明した。これに以外にも、Hブリッジ回路を使用してモータを正転方向および逆転方向に制御するモータ制御装置であれば、どのような用途に使用されるものであっても、本発明を適用することにより、モータを回転させることなく、Hブリッジ回路および電流検出回路を診断できる。
上記実施形態では、シートベルトの引き込み、および引き込み解除用に使用されるモータ2の制御装置について説明した。これに以外にも、Hブリッジ回路を使用してモータを正転方向および逆転方向に制御するモータ制御装置であれば、どのような用途に使用されるものであっても、本発明を適用することにより、モータを回転させることなく、Hブリッジ回路および電流検出回路を診断できる。
また、第2実施形態では、抵抗26、スイッチング素子40および定電流回路42を正転診断用に設置し、抵抗36、スイッチング素子80および定電流回路82を逆転診断用に設置した。これに対し、抵抗、スイッチング素子および定電流回路を一組だけ設置し、切り替えスイッチにより正転診断用と逆転診断用とに切り替えてもよい。
また、本発明では、モータの逆転制御用のHブリッジ回路および電流検出回路だけを診断してもよい。
このように、本発明は、上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の実施形態に適用可能である。
このように、本発明は、上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の実施形態に適用可能である。
2:モータ、10、70:モータ制御装置、20、22、30、32:スイッチング素子(Hブリッジ回路)、24、34:スイッチング素子(電流検出回路)、26、36:抵抗(電流検出回路)、40、80:スイッチング素子(バイパス回路)、42、82:定電流回路(バイパス回路)、60、90:ECU(切替制御手段)
Claims (7)
- モータに流れる電流を制御するモータ制御装置において、
オン、オフの切り替えにより前記モータの回転方向を正転方向および逆転方向に制御するスイッチング素子を有するHブリッジ回路と、
前記スイッチング素子のうち電源と前記モータとの間に設置される上側スイッチング素子に設置され、前記上側スイッチング素子を流れる電流を検出する電流検出回路と、
通電状態のオン、オフを切り替え可能に構成され、前記電流検出回路が設置された前記上側スイッチング素子のオン時において通電オン状態に設定されると、前記電流検出回路が設置された前記上側スイッチング素子を流れる電流を前記モータをバイパスして流すバイパス回路と、
を備えることを特徴とするモータ制御装置。 - 前記電流検出回路は前記電源に対して前記上側スイッチング素子と並列に接続する検出スイッチング素子を有し、前記検出スイッチング素子がオンに設定されることにより前記電流検出回路は前記上側スイッチング素子を流れる電流を検出することを特徴とする請求項1に記載のモータ制御装置。
- 前記バイパス回路は、通電オン状態に設定されると、前記電流検出回路が設置された前記上側スイッチング素子に定電流を流す定電流回路を有することを特徴とする請求項1または2に記載のモータ制御装置。
- 前記電流検出回路および前記バイパス回路は、正転用または逆転用の前記上側スイッチング素子の一方に設置されることを特徴とする請求項1から3のいずれか一項に記載のモータ制御装置。
- 前記バイパス回路は通電状態を切り替える診断スイッチング素子を有することを特徴とする1から4のいずれか一項に記載のモータ制御装置。
- 前記Hブリッジ回路の前記スイッチング素子のオン、オフ、ならびに前記バイパス回路の通電状態のオン、オフの切り替えを制御し、診断モード時において、前記電流検出回路が設置された前記上側スイッチング素子をオンに設定し、それ以外の前記Hブリッジ回路の前記スイッチング素子をオフに設定し、前記バイパス回路を通電オン状態に設定する切替制御手段をさらに備えることを特徴とする請求項1から5のいずれか一項に記載のモータ制御装置。
- シートベルトの引き込み、および引き込み解除用のモータに流れる電流を制御することを特徴とする請求項1から6のいずれか一項に記載のモータ制御装置。
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