JP4715766B2 - 昇圧システムの故障診断装置、昇圧回路の制御装置および車両 - Google Patents
昇圧システムの故障診断装置、昇圧回路の制御装置および車両 Download PDFInfo
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- JP4715766B2 JP4715766B2 JP2007031908A JP2007031908A JP4715766B2 JP 4715766 B2 JP4715766 B2 JP 4715766B2 JP 2007031908 A JP2007031908 A JP 2007031908A JP 2007031908 A JP2007031908 A JP 2007031908A JP 4715766 B2 JP4715766 B2 JP 4715766B2
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Description
式(1)が示すエンジン気圧推定値PINGについてより詳しく説明する。
図10は、エンジン停止時におけるモータジェネレータ内部の気圧PMと、大気圧PAと、吸気圧PIとの関係を説明する図である。なお、図10に示す関係は、たとえば理想的な環境下(たとえば1気圧下)で実験により求められる。図10を参照して、気圧PMはモータジェネレータの内部の気圧の推定値を示す。気圧PMは大気圧PAよりもXだけ低い。また吸気圧PIは大気圧PAよりYだけ低い。すなわち、気圧PMは(PI+Y−X)に等しくなる。
大気圧PAが(PING+Y)以上となる場合(ステップS31においてNO)、上限値設定部312は以下の式(3)に従って、モータジェネレータの気圧PMを算出する(ステップS33)。
ステップS32(またはステップS33)の処理の後、上限値設定部312は故障診断部311の診断結果に基づき、大気圧センサが異常か否かを判定する(ステップS36)。大気圧センサ250が異常の場合(ステップS36においてYES)、上限値設定部312は上限値VLMを最低値(VC)に設定する(ステップS37)。大気圧センサ250が正常の場合(ステップS36においてNO)、上限値設定部312は算出したモータジェネレータの気圧PMに基づいて上限値VLMを設定する(ステップS38)。ステップS37(またはステップS38)の処理が終了すると、全体の処理はステップS31に戻る。
図13は、変形例における気圧PMの算出処理を説明する図である。図13を参照して、変形例では大気圧PAよりも吸気圧PIが低い場合、気圧PMを一定の時間(周期Δt)ごとに徐々に低下させることで上限値VLMが急に小さくなることを抑制する。さらに変形例では気圧PMの低減量(大気圧PAと気圧PMとの差)はΔPmaxを超えないように定められる。変形例において気圧PMは昇圧コンバータ242の制御に用いられる変数となる。変形例によればモータジェネレータの保護を可能にしつつ、モータジェネレータの出力の急変による車両の挙動への影響を防ぐことが可能になる。
ΔP0が最大値ΔPmax以下の場合(ステップS43においてNO)、上限値設定部312は、式(4)に従って、気圧PMを算出する(ステップS45)。
Claims (13)
- 内燃機関を有する車両に搭載された昇圧システムの故障診断装置であって、
前記昇圧システムは、
大気圧を検知して、検知した大気圧を第1の検知結果として出力する大気圧センサと、
入力電圧を昇圧して出力電圧を出力する昇圧回路と、
前記第1の検知結果に基づいて前記昇圧回路の出力電圧を制御する制御部とを含み、
前記故障診断装置は、
大気圧の変化に応じて変化する物理量として前記内燃機関の吸気圧を検知して、検知した物理量を第2の検知結果として出力する他のセンサと、
前記第1および第2の検知結果に基づいて、前記大気圧センサの故障を診断する診断部とを備え、
前記診断部は、前記内燃機関が停止するまでの前記内燃機関の動作状況に基づいて、前記内燃機関が停止した時点から前記大気圧センサの診断を開始するまでの期間を定める、昇圧システムの故障診断装置。 - 前記診断部は、前記内燃機関が停止した場合には、前記内燃機関の吸気圧が大気圧に実質的に等しくなった後に、前記大気圧センサの診断を開始する、請求項1に記載の昇圧システムの故障診断装置。
- 前記診断部は、前記内燃機関の動作時には、前記吸気圧が安定するための条件として予め定められた条件が成立した時に、前記大気圧センサを診断する、請求項1に記載の昇圧システムの故障診断装置。
- 前記内燃機関は、自身の吸気量を調整するためのスロットルバルブを有し、
前記診断部は、予め定められた、前記スロットルバルブの開度に対する前記吸気圧の変化率および前記スロットルバルブの前記開度に基づいて前記内燃機関の吸気圧を推定し、
前記開度が所定値より大きい場合における前記変化率は、前記開度が前記所定値より小さい場合における前記変化率よりも小さく定められ、
前記予め定められた条件は、前記スロットルバルブの開度が所定値以上となり、かつ、前記診断部が推定した前記内燃機関の吸気圧と前記第2の検知結果との差が所定範囲内である状態が一定時間以上続くという条件である、請求項3に記載の昇圧システムの故障診断装置。 - 前記内燃機関には、前記内燃機関の吸気量を計測するエアフローメータが設けられ、
前記診断部は、所定の大気圧下で前記内燃機関が動作した場合における前記内燃機関の吸気量の理論値を予め保持し、前記理論値と前記エアフローメータの計測値との差に基づき、前記所定の大気圧下における前記吸気圧の理論圧と前記第2の検知結果との圧力差を算出し、前記所定の大気圧と前記理論圧との圧力差が前記大気圧によらず一定であるとの条件に従って前記圧力差と前記第2の検知結果とに基づき前記第1の検知結果と比較するための比較値を算出して、前記第1の検知結果および前記比較値に基づき前記大気圧センサの故障を診断する、請求項3に記載の昇圧システムの故障診断装置。 - 前記診断部は、前記第1の検知結果と前記第2の検知結果との差が予め定められた許容範囲内にある場合には、前記大気圧センサが正常であると判定し、
前記許容範囲は、前記内燃機関の停止時と前記内燃機関の動作時とで異なる、請求項1に記載の昇圧システムの故障診断装置。 - 前記診断部は、前記第2の検知結果から前記第1の検知結果を減算して減算結果が前記許容範囲内にあるか否かを判定し、
前記許容範囲の下限値は負の値であり、
前記許容範囲の上限値は、前記下限値の絶対値よりも小さい正の値である、請求項6に記載の昇圧システムの故障診断装置。 - 請求項1から7のいずれか1項に記載の昇圧システムの故障診断装置と、
前記昇圧システムとを備える、車両。 - 内燃機関を有する車両に搭載された昇圧回路の制御装置であって、
大気圧を検知して、検知した大気圧を第1の検知結果として出力する大気圧センサと、
大気圧の変化に応じて変化する物理量として前記内燃機関の吸気圧を検知して、検知した物理量を第2の検知結果を出力する他のセンサと、
前記第1および第2の検知結果に基づいて、前記大気圧センサおよび前記他のセンサの故障を診断するとともに前記昇圧回路の出力電圧を制御する昇圧制御部とを備え、
前記昇圧制御部は、前記内燃機関が停止するまでの前記内燃機関の動作状況に基づいて、前記内燃機関が停止した時点から前記大気圧センサの診断を開始するまでの期間を定める、昇圧回路の制御装置。 - 前記昇圧制御部は、前記第1の検知結果から前記第2の検知結果を減算した値の標準値を予め記憶し、前記第1の検知結果と、前記第2の検知結果に前記標準値を加算した結果とのうちの小さいほうに基づいて、前記昇圧回路の出力電圧を制御する、請求項9に記載の昇圧回路の制御装置。
- 前記昇圧制御部は、前記第2の検知結果が示す前記内燃機関の吸気圧が前記第1の検知結果が示す大気圧より低い場合には、前記第1の検知結果から漸減する変数を設定し、前記変数と前記昇圧回路の出力電圧の制限値との関係と、前記変数とに基づいて、前記昇圧回路の出力電圧を制御する、請求項9に記載の昇圧回路の制御装置。
- 前記昇圧制御部は、前記大気圧センサおよび前記他のセンサの少なくとも一方の故障を検出した場合には、前記大気圧センサおよび前記他のセンサがともに正常である場合に比較して、前記昇圧回路の出力電圧を低く設定する、請求項9に記載の昇圧回路の制御装置。
- 請求項9から12のいずれか1項に記載の昇圧回路の制御装置と、
前記昇圧回路とを備える、車両。
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US12/448,878 US8443779B2 (en) | 2007-02-13 | 2008-01-28 | Boosting system failure diagnosis device, boosting circuit controller and vehicle |
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CN2008800049858A CN101611533B (zh) | 2007-02-13 | 2008-01-28 | 升压系统的故障诊断装置、升压电路的控制装置以及车辆 |
PCT/JP2008/051700 WO2008099693A1 (ja) | 2007-02-13 | 2008-01-28 | 昇圧システムの故障診断装置、昇圧回路の制御装置および車両 |
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