JP2009168048A - 駆動力制御装置 - Google Patents
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Abstract
【解決手段】駆動力源と車輪との間に変速機が設けられた駆動力制御装置において、駆動力源の目標回転数を求める前に、車両の運転者が車輪に伝達することを要求している要求トルクを求める要求トルク算出手段(ステップS002)と、求められた要求トルクに基づいて、駆動力源の仮回転数を求める仮回転数算出手段(ステップS003)と、駆動力源の実際の回転数を検知する実回転数検知手段(ステップS003)と、駆動力源の実際の回転数と仮回転数とを比較して小さい方の回転数を目標回転数とする目標回転数算出手段(ステップS003)とを備えている。
【選択図】図1
Description
Nm1*=(Ne*・(1+ρ)−k・V)/ρ ・・・(1)
すなわち、サンギヤ5とモータ・ジェネレータMG1とが一体回転し、キャリヤ8とエンジン2とが一体回転するため、モータ・ジェネレータMG1の目標回転数Nm1*は、リングギヤ6の回転数Nr(=k・V)と、ドライバー要求目標エンジン回転数Ne*と、動力分配装置3のギヤ比ρとに基づいて求めることができる。なお、数式(1)において、Vは車速、kは係数である。
Tm1*=前回Tm1*+KP(Nm1*−Nm1)+
KI∫(Nm1*−Nm1)dt ・・・(2)
この数式(2)は、モータ・ジェネレータMG1の実際の回転数を、目標回転数に近づけるためのフィードバック制御に用いる関係式である。数式(2)において、右辺第2項の「KP」は比例項のゲインであり、右辺第3項の「KI」は積分項のゲインである。ついで、要求トルクTr*を接続軸21に伝達するために、モータ・ジェネレータMG2から出力するトルク(仮モータトルクTm2tmp)を、数式(3)を用いて求める。
Tm2tmp=(Tr*+Tm1*/ρ)Gr ・・・(3)
ここで、Grは変速機16の変速比であり、サンギヤ17の回転数をリングギヤ18の回転数を除算して求める。
Tm2min=(Win−Tm1*・Nm1)/Nm2 ・・・(4)
Tm2max=(Wout−Tm1*・Nm1)/Nm2 ・・・(5)
上記の下限トルクTm2minおよび上限トルクTm2maxは、蓄電装置27の充電量、モータ・ジェネレータMG2の温度、インバータ30の温度などにより決定される。また、「Win」は、蓄電装置27における放電制限であり、「Wout」は蓄電装置27における充電制限であり、Nm2はモータ・ジェネレータMG2の回転数である。具体的な算出方法は説明しないが、モータ・ジェネレータMG2の温度、インバータ30の温度などにより、出力可能な下限トルクおよび上限トルクを求めることも可能である。さらに、仮モータトルクTm2tmpまたはモータ・ジェネレータMG2の上限トルクTm2maxのうち、小さい方のトルクを変数Tとする。この変数Tまたは下限トルクTm2minのうち、大きい方をモータ・ジェネレータMG2の目標トルクTm2*として設定する。なお、ステップS004およびステップS006およびステップS007では、変速段を用いて処理をおこなっているが、変速比を用いることも可能である。
Claims (4)
- 車両に搭載され、かつ、車輪に伝達する動力を発生する駆動力源と、この駆動力源から前記車輪に至る動力の伝達経路に配置され、かつ、入力回転数と出力回転数との間の変速比を変更可能な変速機とを有し、前記車両における要求駆動力に基づいて前記駆動力源の目標回転数を求め、その目標回転数に基づいて前記変速機の変速比を制御する、駆動力制御装置において、
前記目標回転数を求める前に、前記車両の運転者が前記車輪に伝達することを要求している要求トルクを求める要求トルク算出手段と、
求められた要求トルクに基づいて、前記駆動力源の仮回転数を求める仮回転数算出手段と、
前記駆動力源の実際の回転数を検知する実回転数検知手段と、
前記駆動力源の実際の回転数と前記仮回転数とを比較して小さい方の回転数を前記目標回転数とする目標回転数算出手段と
を備えていることを特徴とする駆動力制御装置。 - 車両に搭載され、かつ、車輪に伝達する動力を発生する駆動力源と、この駆動力源から前記車輪に至る動力の伝達経路に配置され、かつ、入力回転数と出力回転数との間の変速比を変更可能な変速機と、この変速機の変速比を選択するために前記車両の乗員が操作する変速比選択装置とを有する駆動力制御装置において、
前記変速機の変速比を制御する前に、前記駆動力源の実際の回転数と、前記車輪に伝達する要求トルクに基づいて求められる前記駆動力源の仮の回転数とを比較し、いずれか低い方の回転数および車速に基づいて、第1の仮変速比を求める第1の算出手段と、
前記変速機の変速比を制御する前に、前記変速比選択装置の操作により選択された第2の仮変速比を検知する第2の算出手段と、
前記変速機の変速比を制御する前に、前記車両の走行環境を検知し、その検知結果に基づいて、前記車両の走行状態を走行環境に適した状態にする第3の仮変速比を求める第3の算出手段と、
前記変速機の変速比を制御するにあたり、前記第1の仮変速比ないし第3の仮変速比のうち最大変速比を目標変速比として選択する選択手段と
を備えていることを特徴とする駆動力制御装置。 - 前記駆動力源の動力により駆動される補機装置が設けられており、
前記第1の算出手段は、前記駆動力源から前記補機装置に伝達する動力を含む条件に基づいて前記駆動力源の回転数が制御されている時の実際の回転数と、前記駆動力源の仮の回転数とを比較する手段を含むことを特徴とする請求項2に記載の駆動力制御装置。 - 前記変速機は、相互に差動回転可能な入力要素および反力要素および出力要素を有しており、前記入力要素に前記駆動力源が動力伝達可能に接続され、前記反力要素に発電機が接続され、前記出力要素が前記車輪に動力伝達可能に接続されており、前記補機装置が前記発電機に相当しており、前記変速機は、前記反力要素の回転数及び回転方向を制御することにより、前記入力要素と前記出力要素との間における変速比を無段階に変更できる構成であることを特徴とする請求項3に記載の駆動力制御装置。
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