DRIVE CONTROL DEVICE FOR VEHICLE

PROBLEM TO BE SOLVED: To exert appropriate fail-safe control in a case where a rotary electric machine, serving as a source of drive force for a wheel, and a targe part in its driving system are overheated.SOLUTION: A drive control device for a vehicle controls a vehicle driving device in which a rotary electric machine, a transmission, an output member, and a wheel are driven and coupled in order. In a case where an operable area E defined by a DC link voltage Vdc and a rotor rotating speed ω includes a zero point P0, which is an operation point P at which both drive current Iq and a field current Id are zero, the drive control device for the vehicle performs a zero current control ZERO-CTRL in which the drive current Iq and the field current Id are made zero. In a case where the zero point P0 is not included in the operable area E, the drive control device performs a low transmission ratio control LGR-CTRL in which a transmission ratio of a transmission is decreased such that a transmission input rotating speed, which is a rotating speed on the rotary electric machine 80 side, is decreased with respect to a transmission output rotating speed, which is a rotating speed on the output member side.SELECTED DRAWING: Figure 4 【課題】車輪の駆動力源となる回転電機及びその駆動系の中の対象箇所が過熱状態となった場合に、適切なフェールセーフ制御を実行する。【解決手段】回転電機、変速機、出力部材、車輪が順に駆動連結されている車両駆動装置を制御対象とする車両用駆動制御装置は、直流リンク電圧Ｖｄｃとロータ回転速度ωとによって規定される動作可能領域Ｅに、駆動電流Ｉｑ及び界磁電流Ｉｄが共にゼロとなる動作点Ｐであるゼロ点Ｐ０が含まれる場合には、駆動電流Ｉｑ及び界磁電流Ｉｄをゼロにするゼロ電流制御ＺＥＲＯ−ＣＴＲＬを実行し、動作可能領域Ｅにゼロ点Ｐ０が含まれない場合には、出力部材の側の回転速度である変速出力回転速度に対して、回転電機８０の側の回転速度である変速入力回転速度を低下させるように、変速機の変速比を低くする低変速比制御ＬＧＲ−ＣＴＲＬを実行する。【選択図】図４