JP2007306710A - 電動パワーステアリング装置 - Google Patents
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Abstract
【課題】周辺機器に対する有害なノイズを抑制する電動パワーステアリング装置を得る。
【解決手段】トルクセンサ1で検出された運転者の操舵力に応じた電流をブリッジ回路31を制御してモータ2に通電することにより、運転者の操舵力を補助する電動パワーステアリング装置において、モータ2を制御するブリッジ回路31を構成する電界効果トランジスタのソースに直列にインダクタンス素子311,312を挿入すると共に、インダクタンス素子311,312の反ソース端の電位を基準として、又は、インダクタンス素子311,312の中間の電位を基準として、ブリッジ回路31の制御電圧を加算して電界効果トランジスタのゲート駆動電圧を得る。
【選択図】図1
【解決手段】トルクセンサ1で検出された運転者の操舵力に応じた電流をブリッジ回路31を制御してモータ2に通電することにより、運転者の操舵力を補助する電動パワーステアリング装置において、モータ2を制御するブリッジ回路31を構成する電界効果トランジスタのソースに直列にインダクタンス素子311,312を挿入すると共に、インダクタンス素子311,312の反ソース端の電位を基準として、又は、インダクタンス素子311,312の中間の電位を基準として、ブリッジ回路31の制御電圧を加算して電界効果トランジスタのゲート駆動電圧を得る。
【選択図】図1
Description
この発明は,自動車の運転者の操舵力をモータにより補助する電動パワーステアリング装置に関するものである。
モータを用いた自動車の電動パワーステアリング装置においては、バッテリから供給される電圧を、駆動回路にてパルス幅変調(PWM:pulse width modulation)してモータに印加する手法が一般に用いられている。しかし、操舵を補助するには大きな電流が必要であって、この大電流が上記PWM駆動により高周波でスイッチングされるので、電動パワーステアリング装置はラジオ等の周辺機器に対して有害なノイズを発生する。この対策として、例えば特許文献1においては、上記駆動回路を構成するFET(fieldeffect transistor)のゲートを駆動する為の電圧を得るのに、従来の昇圧回路ではなく、ブートストラップ回路を用いれば、昇圧回路が発生するノイズが除去できる、との提案がなされている。
前記従来装置においては、昇圧回路が発生するノイズは除去できるものであるが、大電流をスイッチングすることにより発生するノイズと比較して、昇圧回路が発生するノイズは軽微であって、前記従来装置では対策の効果は不十分であった。この発明は、このような従来の電動パワーステアリング装置の問題を解消するためになされたもので、周辺機器に対して有害なノイズの発生を抑制できる電動パワーステアリング装置を提供することを目的としている。
この発明に係わる電動パワーステアリング装置は、自動車の運転者の操舵力を検出するトルクセンサと、運転者の操舵力を補助するモータと、電界効果トランジスタで構成されるブリッジ回路を有し前記モータを制御する制御装置とを備え、前記トルクセンサで検出された運転者の操舵力に応じた電流を前記ブリッジ回路を制御して前記モータに通電することにより、運転者の操舵力を補助する電動パワーステアリング装置において、前記モータを制御する前記ブリッジ回路を構成する電界効果トランジスタのソースに直列にインダクタンス素子を挿入すると共に、前記インダクタンス素子の反ソース端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、前記ブリッジ回路の制御電圧を加算して前記電界効果トランジスタのゲート駆動電圧を得るようにしたものである。
また、この発明に係わる電動パワーステアリング装置は、自動車の運転者の操舵力を検出するトルクセンサと、運転者の操舵力を補助するモータと、電界効果トランジスタで構成されるインバータ回路を有し前記モータを制御する制御装置とを備え、前記トルクセンサで検出された運転者の操舵力に応じた電流を前記インバータ回路を制御して前記モータに通電することにより、運転者の操舵力を補助する電動パワーステアリング装置において、前記モータを制御する前記インバータ回路を構成する電界効果トランジスタのソースに直列にインダクタンス素子を挿入すると共に、前記インダクタンス素子の反ソース端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、前記インバータ回路の制御電圧を加算して前記電界効果トランジスタのゲート駆動電圧を得るようにしたものである。
この発明の電動パワーステアリング装置によれば、前記モータを制御する前記ブリッジ回路を構成する電界効果トランジスタのソースに直列にインダクタンス素子を挿入すると共に、前記インダクタンス素子の反ソース端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、前記ブリッジ回路の制御電圧を加算して前記電界効果トランジスタのゲート駆動電圧を得るようにしたので、周辺機器に対して有害なノイズを抑制できる電動パワーステアリング装置を得ることができる。
この発明の電動パワーステアリング装置によれば、前記モータを制御する前記インバータ回路を構成する電界効果トランジスタのソースに直列にインダクタンス素子を挿入すると共に、前記インダクタンス素子の反ソース端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、前記インバータ回路の制御電圧を加算して前記電界効果トランジスタのゲート駆動電圧を得るようにしたので、周辺機器に対して有害なノイズを抑制できる電動パワーステアリング装置を得ることができる。
実施の形態1.
図1はこの発明の実施の形態1による電動パワーステアリング装置を示す回路構成図である。図において、1は自動車の運転者の操舵力を検出するトルクセンサ、2は運転者の操舵力を補助するモータである。3は制御装置であって、自動車のバッテリ4から電源の供給を受けて、モータを駆動するHブリッジ回路31と、このHブリッジ回路31を構成する4個のFET(field effect transistor)を制御するFETドライバ32と、モータ2の駆動ライン内に挿入されたシャント抵抗37の両端の電圧差からモータ2への通電電流を検出する電流検出回路33と、モータ2の電流制御を司るCPU34から構成されている。ここで、Hブリッジ回路31による後述するスイッチング動作の影響がバッテリ4に及ばないように、バッテリ4からの電源はチョークコイル35を経てコンデンサ36に蓄電された後に、Hブリッジ回路31へ供給されるように構成されている。
図1はこの発明の実施の形態1による電動パワーステアリング装置を示す回路構成図である。図において、1は自動車の運転者の操舵力を検出するトルクセンサ、2は運転者の操舵力を補助するモータである。3は制御装置であって、自動車のバッテリ4から電源の供給を受けて、モータを駆動するHブリッジ回路31と、このHブリッジ回路31を構成する4個のFET(field effect transistor)を制御するFETドライバ32と、モータ2の駆動ライン内に挿入されたシャント抵抗37の両端の電圧差からモータ2への通電電流を検出する電流検出回路33と、モータ2の電流制御を司るCPU34から構成されている。ここで、Hブリッジ回路31による後述するスイッチング動作の影響がバッテリ4に及ばないように、バッテリ4からの電源はチョークコイル35を経てコンデンサ36に蓄電された後に、Hブリッジ回路31へ供給されるように構成されている。
前記構成にて、トルクセンサ1は運転者の操舵トルクに比例した信号を出力する。このトルクセンサ1の出力を受けて、CPU34の目標電流設定ブロック341は予め設定されたデータテーブルに従って、モータ2に通電すべき電流の目標値(IT)を設定する。一方、CPU34は電流検出回路33にて検出されたモータ2の通電電流をA/D変換器344でA/D変換し、このA/D変換された検出電流値(IM)を前記目標電流値(IT)から減算して差を求め、次段のDuty比算出ブロック342にて、この差が零となるように、例えば比例積分制御の手法により、Hブリッジ回路31を制御すべきPWM(pulsewidth modulation)パルスのDuty比を算出する。次段のパルス発生器343では、この算出されたDuty比を受けて、Hブリッジ回路31を構成する4個のFETへの制御パルス(制御電圧)を発生する。Hブリッジ回路31は、FETドライバ32を介してこの制御パルスにより制御される。以上のようにして、モータ2の通電電流(IM)は目標電流(IT)に制御され、運転者の操舵力に応じた補助力に制御される。
以下、実施の形態1におけるHブリッジ回路31の動作について説明する。図1に示すように、Hブリッジ回路31の下段の二つのFET(FET3,FET4)には、各々ソースと直列にインダクタンスLを持つコイル(インダクタンス素子)311、312が挿入されており、その下端の電位がFETドライバ32に帰還される。このFETドライバ32は、Hブリッジ回路31を構成する4個のFETに対応した4個のバッファ回路から成り、内二つの下段FET(FET3,FET4)に対応するバッファ回路は、前記の帰還された電位(基準とする電位)に、前段のパルス発生器343からのON・OFF信号に応じた所定のゲート制御電圧を加算して出力する。例えば、ゲート制御電圧を10Vとして帰還電位が2Vの場合、パルス発生器343の出力がONであれば2Vに10Vを加算して12Vを出力してFETのゲート駆動電圧とし、OFFであれば帰還電位のみの2Vを出力してFETのゲート駆動電圧としている。
Hブリッジ回路31の下段の2個のFET(FET3,FET4)は、モータ2への通電の方向(モータの回転方向)に応じて右アーム又は左アームがPWM駆動され、モータ2への時間平均された印加電圧はPWM駆動パルスのDuty比に比例する。この時、PWM駆動されていない他方のFET(FET3又はFET4)はOFFの状態に駆動される。上段の2個のFET(FET1,FET2)はPWM駆動では無く、モータ2への通電の方向に応じてON又はOFFの状態に駆動される。モータ2の通電の方向と4個のFETの駆動状態との関係について、図2(a)(b)に従って説明する。図2はPWM駆動されるブリッジ回路のFETのタイミングチャートである。図2(a)に示すように、右アームの上段のFET2をON、それと対を成す左アームの下段のFET3をPWM駆動した場合、モータ2はそのM+端子からM−端子へ向かって通電される。次に図2(b)に示すように、左アームの上段のFET1をON状態に駆動し、それと対を成す右アームの下段のFET4をPWM駆動した場合、モータ2はそのM−端子からM+端子へ向かって通電される。ここで、PWMパルスは、図2(b)に示すように所定の周期Tのパルスであって、同図中Tonで示す所定の区間ONされ、Toffで示す区間OFFされる。通常、このPWMパルスは20kHzに設定されることが多い。
以下、図3(a)(b)(c)及び図4に従ってFET3、FET4のソースに直列に挿入されたインダクタンス素子(コイル)の働きについて詳述する。図3(a)(b)(c)は、Hブリッジ回路31を構成する4個のFETの駆動状態とモータ2の電流経路の関係を模式的に表した説明図であり、各FETの駆動状態をスイッチのON・OFF又は抵抗で表現している。また、スイッチと並列に記したダイオードはFETの寄生ダイオードを示し、図中の破線はモータ2の電流経路を示し、破線中の矢印は電流の方向を表している。ここではHブリッジ回路31の右アームの上段FET2をON状態に駆動し、左アームの下段のFET3をPWM駆動した場合を示している。この場合、モータ2の電流はM+端子からM−端子の方向に流れる。左アームの上段FET1をON状態に駆動して右アームの下段のFET4をPWM駆動した場合にも同様に動作し、この場合にはモータ2の電流方向が逆となる。
図3(c)に示す、PWM駆動されるFET3がONの状態にある期間、モータ電流は同図に示すようにコンデンサ36を出て、FET2、モータ2、FET3を通って該コンデンサ36に戻る経路を流れる。この間、モータ電流はコンデンサ36から供給されて徐々に増加する。次にFET3の駆動状態がOFFに変わると、図3(a)に示すようにモータ電流は経路が転流され、ON状態にあるFET2とOFF状態にあるFET1の寄生ダイオードから成るループを循環する。この間、この循環経路内の抵抗分により電力損失が発生するので電流は徐々に減少する。以上のように、モータ電流の経路はFETのPWM駆動状態に応じて切り替わる。操舵の補助に必要な電流値は、通常は数十アンペアと大きく、またPWM駆動の周波数は通常は20kHz程度と高周波であるので、このモータ電流の転流によりノイズが発生し、その程度は転流速度が高速である程大きくなる。従って、この転流速度を低下させることにより、ノイズの発生を抑制できるのであるが、転流の間、FETは後述するようにONとOFFとの中間の状態にあって、抵抗分による電力損失を生じるので、転流速度はノイズの抑制と電力損失の抑制とを両立し得る値に設定する必要がある。つまり電力損失が許容できる範囲で転流速度を抑制する必要がある。
以下、この転流時の動作について、特にコイル311、312の作用に着目して説明する。図4はPWM駆動の1周期内の各部の動作の詳細を表したタイミングチャートである。同図において、S1はCPU34からの出力パルス、S2はFETドライバ32の出力、S3はFET3のゲート電圧、S4はFET3のソース電流、S5はFET3のドレイン電圧を表している。なお、同図の各信号の電圧レベルはFET3のソース電位を基準にして表している。
まず、CPU34から出力されるパルス(S1)がOFF状態にある期間、上述したように、モータ電流は図3(a)に示す経路を循環する。次にFET3がOFF状態からON状態へと転じるターンONの動作について説明する。図4にT1で示すタイミングにてCPU34からONのパルス(S1)が出力されると、FETドライバ32の出力(S2)はHighとなり、図1に示すゲート抵抗Rgを介して、FET3のゲートの入力容量が充電されてゲート電圧(S3)が上昇する。このゲート電圧(S3)が図4にT2で示すタイミングにて所定の閾値(Vthon)に達すると、モータ電流の転流が開始する。即ち、それ迄はOFFの状態にあったFET3のドレインとソースの間の抵抗値が低下して、モータ電流の一部が図3(b)に示すように、FET3を流れ始める。この電流はソースに直列に挿入されたコイル311を流れるので、コイル311の両端間には下記(1)式に従って電流の増加の速度に比例した電圧(Vc)が生じる。
Vc=L×[dIs/dt] ------(1)
ここで、Lはコイル311のインダクタンス、IsはFET3のソース電流、tは時間を示す。前述したようにFETドライバ32は、このコイルの下端の電位を基準として、これに所定の制御電圧を加算して出力するので、モータ電流の転流開始(T2)と共にその出力電圧(S2)は低下し、FET3のソース電流の増加が速まろうとすると、FETドライバ32からの出力(S2)はより低下してFET3のドレインとソースの間の抵抗値の低下速度が抑制される。
ここで、Lはコイル311のインダクタンス、IsはFET3のソース電流、tは時間を示す。前述したようにFETドライバ32は、このコイルの下端の電位を基準として、これに所定の制御電圧を加算して出力するので、モータ電流の転流開始(T2)と共にその出力電圧(S2)は低下し、FET3のソース電流の増加が速まろうとすると、FETドライバ32からの出力(S2)はより低下してFET3のドレインとソースの間の抵抗値の低下速度が抑制される。
つまり、FET3を流れるモータ電流の増加速度が、コイル311のインダクタンスLによって規定される。以降、FET3を流れる電流が増加を続け、図4にT3で示すタイミングにてモータ電流の全てがFET3へ流れると、即ちモータ電流の転流が完了すると、FET3のドレイン電圧(S5)は低下してソース電位に達し、その後にゲートの入力電圧(S3)はFETドライバ32の出力電圧(S2)に達する。以上でターンONの動作を完了し、モータ電流は図3(c)に示すように、右アームの上段のFET2から左アームの下段のFET3に向かって流れる。
次にFET3がON状態からOFF状態へと転じるターンOFFの動作について説明する。図4にT4で示すタイミングにて、CPU34からのパルス(S1)がOFFに変化すると、FETドライバ32の出力(S2)はLowとなり、図1に示すゲート抵抗Rgを介してFET3のゲートの入力容量が放電されて、ゲート電圧(S3)が下降する。このゲート電圧(S3)が、図4にT5で示すタイミングにて所定の閾値(Vthon)に達すると、FET3のドレイン電圧が上昇して電源電圧に達し、以降モータ電流の転流が開始する。
即ち、それ迄はONの状態にあったFET3のドレインとソースの間の抵抗値が増加して、モータ電流の一部が図3(b)に示すように、FET1の寄生ダイオードを流れ始める。FET3を流れる電流はソースに直列に挿入されたコイル311を流れるので、その減少の速度は、上述のターンON時と同様にして、コイル311のインダクタンスLにより規定される。以降、FET3を流れる電流が減少を続け、図4にT6で示すタイミングにてモータ電流の全てがFET1の寄生ダイオードへ流れると、即ちモータ電流の転流が完了すると、FET3のゲート電圧(S3)は低下してソース電位に達する。以上でターンOFFの動作を完了し、モータ電流は図3(a)に示すようにON状態にあるFET2とOFF状態にあるFET1の寄生ダイオードから成る経路を循環して流れる。
以上の動作の中で、コイル311のインダクタンスLは電流の変化速度検出器として作用し、検出した値をFETドライバ32へ帰還することにより、FET3のソース電流の変化速度を規定し抑制している。このようにして、FETのPWM駆動に伴うモータ電流の転流時の電流の増減速度がコイル311のインダクタンスLにより規定し抑制されるので、このインダクタンスLを適切な値に設定することにより、転流時のスイッチング損失を抑えると共に(スイッチング損失を許容できる範囲に抑えると共に)発生するノイズを抑制することができる。
実施の形態2.
ところで、以上の説明では、FETのソースと直列にコイルを挿入した場合について述べたが、このコイル(インダクタンス素子)のインダクタンスを、Hブリッジ回路31を実装したプリント基板の銅箔パターンで形成しても同様の効果を得ることができる。これについて、図5、及び図6に従って説明する。図5は実施の形態2に用いるプリント基板を示す構成図である。図6は実施の形態2に用いるプリント基板の動作を説明するタイミングチャートである。
ところで、以上の説明では、FETのソースと直列にコイルを挿入した場合について述べたが、このコイル(インダクタンス素子)のインダクタンスを、Hブリッジ回路31を実装したプリント基板の銅箔パターンで形成しても同様の効果を得ることができる。これについて、図5、及び図6に従って説明する。図5は実施の形態2に用いるプリント基板を示す構成図である。図6は実施の形態2に用いるプリント基板の動作を説明するタイミングチャートである。
図5において、313はHブリッジ回路31を実装したプリント基板の一部を示したもので、FET2、FET3とその周辺部を表している。簡単の為に他の部分は省略し、またプリント基板以外の部分は図1と同様の回路構成図で記述している。なお、銅箔は同図中に斜線を付して示している。FET2及びFET3のゲート(G)は、各々抵抗Rgを介してFETドライバ32から駆動される。ここで、FET2がON状態に駆動され、FET3がPWM駆動されている場合、モータ2はそのM+端子からM-端子に向かって通電される。PWM駆動にてFET3がON状態にある期間では、モータ電流は、コンデンサ36を出て、FET2のドレイン(D)、FET2のソース(S)、モータ2、FET3のドレイン(D)、FET3のソース(S)を順次通ってコンデンサ36に戻る電流経路を流れる。
ここで、FET3のソース(S)とコンデンサ36は銅箔で接続されているが、銅箔はその厚みと幅と長さにて定まる所定のインダクタンスを持っている。従って、このFET3のソース(S)とコンデンサ36を接続する銅箔の所定の個所から電位信号を引き出して、FETドライバ32のFET3のゲート(G)を駆動するバッファ回路へ帰還すると、前述したコイル311と同等の効果を得ることができる。また、銅箔によるインダクタンスは銅箔の長さに比例するので、FET3のソース(S)から帰還電圧を引き出す点までの距離によってモータ電流が転流する時の電流の増減の速度を調整することができる。
図6にその様子を示す。同図にてS6はCPU34からのPWM駆動パルス、S7はFET3のソース電流を示し、S7の実線は図5にて[PA]で記述した点からFETドライバ32への帰還電圧信号を引き出した場合を示し、破線は[PB]で記述した点から帰還電圧(電位)信号を引き出した場合を示している。点[PB]のFET3のソース(S)からの距離は、点[PA]からの距離よりも短くインダクタンスの値が小さいので、同図に示すように電流の増減速度が速くなっている。
実施の形態3.
PWM駆動に伴うモータ電流の転流には、OFFからONへ変化するターンONと、ONからOFFへ変化するターンOFFとの二通りがあるが、FETドライバ32への帰還電圧信号を引き出す点をこのターンON時とターンOFF時とで切り替えることにより、両方の電流の変化速度を独立に調整することができる。図7はその切り替える方法を示したものであって、FETドライバ32へ帰還する電圧信号を[PA]と[PB]との2点から引き出し、アナログスイッチ38によりいずれかを選択してFETドライバ32へ帰還する構成としている。なお、図7ではアナログスイッチ38を機械式スイッチの記号を用いて模式的に記述しているが、半導体スイッチで構成される。このアナログスイッチ38をCPU34からのPWM駆動パルスに応じて選択動作させる事により、モータ電流の転流速度をターンON時とターンOFF時とで独立に調整することが可能となり、転流速度のきめ細かい調整が行なえるので、ノイズの抑制がより効果的となる。
PWM駆動に伴うモータ電流の転流には、OFFからONへ変化するターンONと、ONからOFFへ変化するターンOFFとの二通りがあるが、FETドライバ32への帰還電圧信号を引き出す点をこのターンON時とターンOFF時とで切り替えることにより、両方の電流の変化速度を独立に調整することができる。図7はその切り替える方法を示したものであって、FETドライバ32へ帰還する電圧信号を[PA]と[PB]との2点から引き出し、アナログスイッチ38によりいずれかを選択してFETドライバ32へ帰還する構成としている。なお、図7ではアナログスイッチ38を機械式スイッチの記号を用いて模式的に記述しているが、半導体スイッチで構成される。このアナログスイッチ38をCPU34からのPWM駆動パルスに応じて選択動作させる事により、モータ電流の転流速度をターンON時とターンOFF時とで独立に調整することが可能となり、転流速度のきめ細かい調整が行なえるので、ノイズの抑制がより効果的となる。
実施の形態4.
Hブリッジ回路31は、FETで構成したが、図8に示すように、FETをトランジスタに置き換えても同様に構成することができる。図8は実施の形態4のブリッジ回路314を示す回路構成図である。
トランジスタに置き換える場合は、トランジスタのエミッタが、FETのソースに相当し、トランジスタのコレクタがFETのドレインに相当し、トランジスタのゲートがFETのゲートに相当する。そして、モータを制御するブリッジ回路を構成するトランジスタTR3,TR4のエミッタに直列にインダクタンス素子311,312を挿入すると共に、前記インダクタンス素子311,312の反エミッタ端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、ブリッジ回路の制御電圧を加算してトランジスタのゲート駆動電圧を得るようにすればよい。
Hブリッジ回路31は、FETで構成したが、図8に示すように、FETをトランジスタに置き換えても同様に構成することができる。図8は実施の形態4のブリッジ回路314を示す回路構成図である。
トランジスタに置き換える場合は、トランジスタのエミッタが、FETのソースに相当し、トランジスタのコレクタがFETのドレインに相当し、トランジスタのゲートがFETのゲートに相当する。そして、モータを制御するブリッジ回路を構成するトランジスタTR3,TR4のエミッタに直列にインダクタンス素子311,312を挿入すると共に、前記インダクタンス素子311,312の反エミッタ端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、ブリッジ回路の制御電圧を加算してトランジスタのゲート駆動電圧を得るようにすればよい。
実施の形態5.
以上、補助力を発生するモータとしてDCモータを用い、これをHブリッジ回路にて駆動する場合について述べたが、ブラシレスモータを用いてインバータ回路にて駆動する場合にもこの発明は同様に適応できる。図9は実施の形態5のインバータ回路315を示す回路構成図である。図において、51−56はインバータ回路315を構成する電界効果トランジスタ、316−318はコイル(インダクタンス素子)である。21はブラシレス三相モータである。モータ21を制御するインバータ回路315を構成する下段の電界効果トランジスタ54,55,56のソースにそれぞれ直列にコイル(インダクタンス素子)316,317,318を挿入すると共に、前記コイル316,317,318の反ソース端の電位を基準として、又は、前記コイル316,317,318の中間の電位を基準として、インバータ回路315の制御電圧を加算して、電界効果トランジスタ54,55,56のゲート駆動電圧を得るようにすればよい。
以上、補助力を発生するモータとしてDCモータを用い、これをHブリッジ回路にて駆動する場合について述べたが、ブラシレスモータを用いてインバータ回路にて駆動する場合にもこの発明は同様に適応できる。図9は実施の形態5のインバータ回路315を示す回路構成図である。図において、51−56はインバータ回路315を構成する電界効果トランジスタ、316−318はコイル(インダクタンス素子)である。21はブラシレス三相モータである。モータ21を制御するインバータ回路315を構成する下段の電界効果トランジスタ54,55,56のソースにそれぞれ直列にコイル(インダクタンス素子)316,317,318を挿入すると共に、前記コイル316,317,318の反ソース端の電位を基準として、又は、前記コイル316,317,318の中間の電位を基準として、インバータ回路315の制御電圧を加算して、電界効果トランジスタ54,55,56のゲート駆動電圧を得るようにすればよい。
1 トルクセンサ 2 モータ
3 制御装置 4 バッテリ
21 三相モータ 31 Hブリッジ回路
32 FETドライバ 33 電流検出回路
34 CPU 35 チョークコイル
36 コンデンサ 37 シャント抵抗
51−56 電界効果トランジスタ 311 コイル
312 コイル 314 ブリッジ回路
315 インバータ回路 316−318 コイル
341 目標電流設定ブロック 342 Duty比算出ブロック
343 パルス発生器 344 A/D変換器
3 制御装置 4 バッテリ
21 三相モータ 31 Hブリッジ回路
32 FETドライバ 33 電流検出回路
34 CPU 35 チョークコイル
36 コンデンサ 37 シャント抵抗
51−56 電界効果トランジスタ 311 コイル
312 コイル 314 ブリッジ回路
315 インバータ回路 316−318 コイル
341 目標電流設定ブロック 342 Duty比算出ブロック
343 パルス発生器 344 A/D変換器
Claims (5)
- 自動車の運転者の操舵力を検出するトルクセンサと、運転者の操舵力を補助するモータと、電界効果トランジスタで構成されるブリッジ回路を有し前記モータを制御する制御装置とを備え、
前記トルクセンサで検出された運転者の操舵力に応じた電流を前記ブリッジ回路を制御して前記モータに通電することにより、運転者の操舵力を補助する電動パワーステアリング装置において、
前記モータを制御する前記ブリッジ回路を構成する電界効果トランジスタのソースに直列にインダクタンス素子を挿入すると共に、前記インダクタンス素子の反ソース端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、前記ブリッジ回路の制御電圧を加算して前記電界効果トランジスタのゲート駆動電圧を得るようにしたことを特徴とする電動パワーステアリング装置。 - 前記インダクタンス素子のインダクタンスを前記ブリッジ回路が実装されたプリント基板の銅箔パターンで形成したことを特徴とする請求項1記載の電動パワーステアリング装置。
- 前記銅箔パターン上に前記電界効果トランジスタのゲート駆動電圧の基準とする電位を得る点を2箇所設け、前記電界効果トランジスタのオンとオフの駆動状態に応じて、この2箇所の基準電位のいずれか一方を選択するようにしたことを特徴とする請求項2記載の電動パワーステアリング装置。
- 自動車の運転者の操舵力を検出するトルクセンサと、運転者の操舵力を補助するモータと、トランジスタで構成されるブリッジ回路を有し前記モータを制御する制御装置とを備え、
前記トルクセンサで検出された運転者の操舵力に応じた電流を前記ブリッジ回路を制御して前記モータに通電することにより、運転者の操舵力を補助する電動パワーステアリング装置において、
前記モータを制御する前記ブリッジ回路を構成するトランジスタのエミッタに直列にインダクタンス素子を挿入すると共に、前記インダクタンス素子の反エミッタ端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、前記ブリッジ回路の制御電圧を加算して前記トランジスタのゲート駆動電圧を得るようにしたことを特徴とする電動パワーステアリング装置。 - 自動車の運転者の操舵力を検出するトルクセンサと、運転者の操舵力を補助するモータと、電界効果トランジスタで構成されるインバータ回路を有し前記モータを制御する制御装置とを備え、
前記トルクセンサで検出された運転者の操舵力に応じた電流を前記インバータ回路を制御して前記モータに通電することにより、運転者の操舵力を補助する電動パワーステアリング装置において、
前記モータを制御する前記インバータ回路を構成する電界効果トランジスタのソースに直列にインダクタンス素子を挿入すると共に、前記インダクタンス素子の反ソース端の電位を基準として、又は、前記インダクタンス素子の中間の電位を基準として、前記インバータ回路の制御電圧を加算して前記電界効果トランジスタのゲート駆動電圧を得るようにしたことを特徴とする電動パワーステアリング装置。
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