JP2011250499A - 電動車両 - Google Patents
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Abstract
【解決手段】 フロント側駆動輪またはリア側駆動輪にトルクが出力されており、かつ、車速Vがゼロ近傍である場合には、フロント側駆動輪を駆動する同期電動機の出力トルクをリア側駆動輪を駆動する誘導電動機の出力トルクよりも小さくし、フロント側駆動輪またはリア側駆動輪にトルクが出力されており、かつ、各駆動輪に出力されたトルクによって車両が移動しようとする方向と逆方向に車両が所定の速度V2で移動している場合には、同期電動機の出力トルクを誘導電動機の出力トルクよりも大きくする出力トルク変更手段を備える。
【選択図】図2
Description
Kf=VB/(VH+VB) ‐‐‐‐‐‐‐‐‐‐‐‐ (式1)
によって計算し、リア側目標出力トルクTr3´の補正係数Krを、
Kr=VH/(VH+VB) ‐‐‐‐‐‐‐‐‐‐‐‐ (式2)
によって計算する。そして、図5に示すように、各補正係数Kf、Krを設定したフロント側目標出力トルクTf3´、リア側目標出力トルクTr3´にかけて各目標トルクを補正する。この補正によって、フロント側目標出力トルクTf3´は当初設定したフロント側目標出力トルクTf3´よりも小さくなり、リア側目標出力トルクTr3´は当初設定したリア側目標出力トルクTr3´よりも大きくなり、図6(a)に示すフロント側目標出力トルクTf3´とリア側目標出力トルクTr3´との分割点P3は図6(c)に示すフロント側目標出力トルクTf3´とリア側目標出力トルクTr3´との分割点P3´のように変化する。そして、制御部70は、補正後のフロント側目標出力トルクTf3´、リア側目標出力トルクTr3´によって第1インバータ41、第2インバータ42の出力電流を増減する。
Kf=ΔTf/(ΔTf+ΔTr) ‐‐‐‐‐‐‐‐‐‐ (式3)
によって計算し、リア側目標出力トルクTr3´の補正係数Krを、
Kr=ΔTr/(ΔTf+ΔTr) ‐‐‐‐‐‐‐‐‐‐ (式4)
によって計算する。そして、図7に示すように、各補正係数Kf、Krを設定したフロント側目標出力トルクTf3´、リア側目標出力トルクTr3´にかけて各目標トルクを補正する。この補正によって、スイッチング素子の温度と素子の上限温度の差が小さい方の目標出力トルクを小さくし、スイッチング素子の温度と素子の上限温度の差が大きい方の目標出力トルクを大きくすることができる。従って、本実施形態は、スイッチング素子の温度の上昇を抑制すると共に、スイッチング素子の温度が上限温度近くまで高くなっている方のインバータから出力する電流を小さくし、スイッチング素子の温度が上限温度に対して余裕のある方のインバータから出力する電流を大きくし、各スイッチング素子の温度上昇を均等化して一方のインバータのスイッチング素子の温度が上昇してしまわないようにすることができる。
Claims (5)
- 第1の駆動輪にトルクを出力する同期電動機と、
第2の駆動輪にトルクを出力する誘導電動機と、
第1の直流電力を前記同期電動機駆動用の交流電力に変換する第1のインバータと、
第2の直流電力を前記誘導電動機駆動用の交流電力に変換する第2のインバータと、
車両の速度を検出する速度センサと、
前記同期電動機と前記誘導電動機から出力されるトルクを変化させる制御部と、
を備える電動車両であって、
前記制御部は、
前記第1の駆動輪または前記第2の駆動輪にトルクが出力されており、かつ、車速がゼロ近傍である場合には、前記同期電動機の出力トルクを前記誘導電動機の出力トルクよりも小さくし、
前記第1の駆動輪または前記第2の駆動輪にトルクが出力されており、かつ、前記各駆動輪に出力されたトルクによって前記車両が移動しようとする方向と逆方向に前記車両が所定の速度で移動している場合には、前記同期電動機の出力トルクを前記誘導電動機の出力トルクよりも大きくする出力トルク変更手段を備えること、
を特徴とする電動車両。 - 請求項1に記載の電動車両であって、
前記所定の速度は、前記誘導電動機の固定子に発生する回転磁界の回転速度がゼロ近傍となる速度であり、
前記制御部の前記トルク変更手段は、
車両の速度がゼロ近傍から前記所定の速度に向かって前記車両の速度が変化するに応じて、同期電動機の出力トルクを増加させるとともに、誘導電動機の出力トルクを減少されること、
を特徴とする電動車両。 - 請求項2に記載の電動車両であって、
前記制御部の前記トルク変更手段は、
前記第1の直流電力の第1の電圧と前記第2の直流電力の第2の電圧との比率に応じて前記同期電動機の出力トルクと前記誘導電動機の出力トルクとの比率を変化させること、
を特徴とする電動車両。 - 請求項2または3に記載の電動車両であって、
前記第1のインバータは第1のスイッチング素子を含み、
前記第2のインバータは第2のスイッチング素子を含み、
前記制御部の前記トルク変更手段は、
前記第1のスイッチング素子の温度と前記第2のスイッチング素子の温度に応じて前記同期電動機の出力トルクと前記誘導電動機の出力トルクとの比率を変化させること、
を特徴とする電動車両。 - 請求項2に記載の電動車両であって、
前記制御部の前記トルク変更手段は、
車両速度に対する前記同期電動機の出力トルクと前記誘導電動機の出力トルクとの比率を予め定めたマップに基づいて各電動機の目標出力トルクを設定した後、
前記第1の直流電力の前記第1の電圧と前記第2の直流電力の前記第2の電圧との比率、または、前記第1のスイッチング素子の温度と前記第2のスイッチング素子の温度に応じて前記各電動機の出力トルクを補正し、補正した後の前記各電動機の目標出力トルクを再設定すること、
を特徴とする電動車両。
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JP2015080350A (ja) * | 2013-10-17 | 2015-04-23 | トヨタ自動車株式会社 | 電動車両 |
JP2015223070A (ja) * | 2014-04-30 | 2015-12-10 | トヨタ自動車株式会社 | 車両の駆動制御システム |
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JP6057076B2 (ja) * | 2013-05-13 | 2017-01-11 | 三菱自動車工業株式会社 | 車両制御装置 |
JP6187268B2 (ja) * | 2014-01-10 | 2017-08-30 | トヨタ自動車株式会社 | 電動車両 |
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US8600597B2 (en) | 2013-12-03 |
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