JP2015055337A - 車両の制御装置 - Google Patents
車両の制御装置 Download PDFInfo
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Abstract
Description
次に、「WSC走行モード」の詳細について説明する。「WSC走行モード」とは、エンジンEが作動した状態を維持している点に特徴があり、ドライバ要求トルク変化に対する応答性が高い。具体的には、第1クラッチCL1を完全締結し、第2クラッチCL2をドライバ要求トルクに応じた伝達トルク容量TCL2としてスリップ制御し、エンジンE及び/又はモータジェネレータMGの駆動力を用いて走行する。
次に、MWSC走行モード領域を設定した理由について説明する。推定勾配が所定勾配(g1もしくはg2)より大きいときに、例えば、ブレーキペダル操作を行うことなく車両を停止状態もしくは微速発進状態に維持しようとすると、平坦路に比べて大きな駆動力が要求される。自車両の荷重負荷に対抗する必要があるからである。
上述のように、「WSC走行モード」が選択された状態で、運転者がブレーキペダルを踏み込み、車両停止状態となった場合、第2クラッチCL2にはクリープトルク相当の伝達トルク容量が設定され、エンジンEに直結されたモータジェネレータMGがアイドル回転数を維持するように回転数制御が実行される。駆動輪は車両停止によって回転数がゼロであるから、第2クラッチCL2にはアイドル回転数相当のスリップ量が発生する。この状態が長く継続すると、第2クラッチCL2の耐久性が低下するおそれがあることから、運転者によってブレーキペダルが踏まれ、車両停止状態が維持されている場合には、第2クラッチCL2を解放することが望ましい。
図12は上記車両停止時伝達トルク容量補正制御処理として実行される第2クラッチCL2の指令油圧に関するスタンバイ圧学習制御処理のフローチャートであり、図13は上記第2クラッチCL2の指令油圧とモータジェネレータMGの駆動トルクである実MGトルクとの関係を示すタイムチャートである。
次に、図1に示した自動変速機ATの主要素であるバリエータVの縦滑り変速制御について説明する。図14はバリエータVの縦滑り変速制御のフローチャートであり、図15は図1に示したバリエータVの概略構造を示している。
CL1…第1クラッチ
MG…モータジェネレータ
CL2…第2クラッチ
AT…自動変速機
V…バリエータ
1…エンジンコントローラ
2…モータコントローラ
3…インバータ
4…バッテリ
5…第1クラッチコントローラ
6…第1クラッチ油圧ユニット
7…ATコントローラ
8…第2クラッチ油圧ユニット
9…ブレーキコントローラ
10…統合コントローラ
31…バリエータ油圧ユニット
500…変速制御部
Claims (4)
- 車両の駆動力を発生する回転駆動源と、
上記回転駆動源と駆動輪との間に介装され、油圧指令値に基づいて伝達トルク容量を発生するクラッチと、
上記駆動源とクラッチとの間に介装され、入力側となるプライマリプーリと出力側となるセカンダリプーリおよび上記双方のプーリ間に掛け渡されたベルトとからなるバリエータと、
上記クラッチをスリップ制御するとともに、当該クラッチの回転駆動源側の回転数が当該クラッチの駆動輪側の回転数よりも所定量高い回転数となるように上記回転駆動源を回転数制御する回転数制御手段と、
上記車両の停止状態を判定する車両停止状態判定手段と、
上記回転駆動源の実トルクを検出するトルク検出手段と、
上記バリエータの変速比の最ロー状態を判定する最ロー状態判定手段と、
車両停止状態と判定されたときに、上記クラッチの油圧指令値を学習制御しながら当該クラッチの伝達トルク容量が限りなく零に近い大きさとなる上記クラッチの油圧指令値を学習する学習制御を行い、上記油圧指令値を設定する車両停止時伝達トルク容量補正手段と、
車両の運転状態に応じて上記バリエータの変速比を制御する変速制御手段と、
を備えていて、
上記変速制御手段は、上記車両停止時伝達トルク容量補正手段による上記クラッチの油圧指令値の学習が収束したことを条件に、上記車両停止状態で且つ上記バリエータの変速比が最ロー状態でないときに上記バリエータの変速比をロー側に変速する縦滑り変速制御を実行するものであることを特徴とする車両の制御装置。 - 上記変速制御手段は、上記クラッチの目標伝達トルク容量が所定値以下であることを条件に、上記縦滑り変速制御を実行するものであることを特徴とする請求項1に記載の車両の制御装置。
- 上記車両停止時伝達トルク容量補正手段による油圧指令値の学習の収束判定は、上記学習制御の実行回数が予め設定した所定回数となったことをもって上記学習が収束したと判定することを特徴とする請求項2に記載の車両の制御装置。
- 上記回転駆動源の実トルクを検出するトルク検出手段を有し、
上記車両停止時伝達トルク容量補正手段は、
上記油圧指令値のN回目の学習値に所定量だけ上乗せした油圧を初期油圧指令値とし、
この初期油圧指令値から油圧指令値を段階的に低下させて当該油圧指令値の変化に上記回転駆動源の実トルクが追従しなくなる直前の油圧指令値を終了指令値とし、
この終了指令値または当該終了指令値に所定の補正量を上乗せしたものを上記油圧指令値のN+1回目の学習値とすることを特徴とする請求項3に記載の車両の制御装置。
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