JP2017043200A - デジタルフィルタ、および、車両の駆動力制御装置 - Google Patents
デジタルフィルタ、および、車両の駆動力制御装置 Download PDFInfo
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Abstract
Description
入力されたデジタル信号から特定の周波数成分を低減させた出力信号を出力するデジタルフィルタにおいて、
前記出力信号の出力値に応じて機器の作動が制御されるシステムに用いられ、
入力されたデジタル信号にフィルタ処理を施すフィルタ処理手段(12)、
前記フィルタ処理手段に入力されたフィルタ処理前の信号の表す値であるフィルタ処理前値(D1)と、前記フィルタ処理前の信号が前記フィルタ処理手段によってフィルタ処理された後の信号の表す値であるフィルタ処理後値(D2)と、前回出力された出力信号の表す値である前回出力値(D3)とを取得し、前記フィルタ処理前値と前記フィルタ処理後値と前記前回出力値とのうちから、中間の値を選択して、前記選択した中間の値に基づいて今回の出力信号の出力値を設定する出力値設定手段(15)と
を備えたことにある。
この車両の駆動力制御装置の特徴は、
ドライバー要求駆動力を演算し、前記演算したドライバー要求駆動力を表す要求駆動力信号を出力する要求駆動力演算手段(31)と、
前記デジタルフィルタであって、前記要求駆動力信号を入力して、前記フィルタ処理手段が、車体の振動周波数成分を低減するように前記要求駆動力信号にフィルタ処理を施すように構成されたノッチフィルタ(32)と、
前記ノッチフィルタの出力信号の出力値に基づいて、車両の走行用駆動装置で発生させる駆動力を制御する駆動力制御手段(33、331)と
を備えたことにある。
前記走行用駆動装置は、エンジンとモータジェネレータとを有するハイブリッド式駆動装置(20)であり、
前記駆動力制御手段(33)は、前記ノッチフィルタの出力信号の出力値に応じて、前記ハイブリッド式駆動装置の駆動力を制御するとともに前記エンジンの駆動状態と非駆動状態とを切り替えるように構成されたことにある。
前記走行用駆動装置は、エンジンと自動変速機とを有する駆動装置(201)であり、
前記駆動力制御手段(331)は、前記ノッチフィルタの出力信号の出力値に応じて、前記エンジンの駆動力を制御するとともに前記自動変速機の変速段を切り替えるように構成されたことにある。
本実施形態のノッチフィルタ32は、デジタルフィルタである。通常、デジタルフィルタは、フィルタ処理された後の出力信号値がフィルタ処理前の入力値に対して遅れ、しかも、入力値の変化に対して単調には追従しない(つまり、脈動する)という特性を有する。
上述した実施形態のデジタルフィルタ10においては、前回出力値D3が中間の値となっているあいだは、出力値Dxは一定値に維持される。従って、出力値Dxは、非常に安定するため、機器の安定性においては有利である。一方、出力値Dxの推移を、本来のフィルタ処理の動きに近づけたい場合には、この変形例のデジタルフィルタが有効となる。この変形例においては、出力値Dxが本来のフィルタ処理の動きに近づくように中間の値を補正し、その補正された値を出力値Dxに設定する機能を備えている。図6は、変形例としてのデジタルフィルタ101の概略構成を表す。
上述した実施形態(以下、第1実施形態と呼ぶ)に係る車両の駆動力制御装置は、ハイブリッド自動車に適用されるが、駆動装置としてエンジンおよび自動変速機を備えた自動車に適用することもできる。図9は、第2実施形態に係る車両の駆動力制御装置の概略構成図である。
Claims (6)
- 入力されたデジタル信号から特定の周波数成分を低減させた出力信号を出力するデジタルフィルタにおいて、
前記出力信号の出力値に応じて機器の作動が制御されるシステムに用いられ、
入力されたデジタル信号にフィルタ処理を施すフィルタ処理手段と、
前記フィルタ処理手段に入力されたフィルタ処理前の信号の表す値であるフィルタ処理前値と、前記フィルタ処理前の信号が前記フィルタ処理手段によってフィルタ処理された後の信号の表す値であるフィルタ処理後値と、前回出力された出力信号の表す値である前回出力値とを取得し、前記フィルタ処理前値と前記フィルタ処理後値と前記前回出力値とのうちから、中間の値を選択して、前記選択した中間の値に基づいて今回の出力信号の出力値を設定する出力値設定手段と
を備えたデジタルフィルタ。 - 請求項1記載のデジタルフィルタにおいて、
前記出力値設定手段は、選択した中間の値を今回の出力信号の出力値に設定するように構成されたデジタルフィルタ。 - 請求項1記載のデジタルフィルタにおいて、
前記出力値設定手段は、選択した中間の値が前記前回出力値である場合には、前記フィルタ処理後値が前記フィルタ処理前値よりも大きければ前記選択した中間の値を所定量だけ増加補正して前記増加補正した値を前記出力値に設定する増加補正処理と、前記フィルタ処理後値が前記フィルタ処理前値よりも小さければ前記選択した中間の値を所定量だけ低減補正して前記低減補正した値を前記出力値に設定する低減補正処理との少なくとも一方を行い、選択した中間の値が前記前回出力値でない場合には、選択した中間の値を今回の出力信号の出力値に設定するように構成されたデジタルフィルタ。 - 請求項1ないし請求項3の何れか一項記載のデジタルフィルタを備えた車両の駆動力制御装置において、
ドライバー要求駆動力を演算し、前記演算したドライバー要求駆動力を表す要求駆動力信号を出力する要求駆動力演算手段と、
前記デジタルフィルタであって、前記要求駆動力信号を入力して、前記フィルタ処理手段が、車体の振動周波数成分を低減するように前記要求駆動力信号にフィルタ処理を施すように構成されたノッチフィルタと、
前記ノッチフィルタの出力信号の出力値に応じて、車両の走行用駆動装置で発生させる駆動力を制御する駆動力制御手段と
を備えた車両の駆動力制御装置。 - 請求項4記載の車両の駆動力制御装置において、
前記走行用駆動装置は、エンジンとモータジェネレータとを有するハイブリッド式駆動装置であり、
前記駆動力制御手段は、前記ノッチフィルタの出力信号の出力値に応じて、前記ハイブリッド式駆動装置の駆動力を制御するとともに前記エンジンの駆動状態と非駆動状態とを切り替えるように構成された車両の駆動力制御装置。 - 請求項4記載の車両の駆動力制御装置において、
前記走行用駆動装置は、エンジンと自動変速機とを有する駆動装置であり、
前記駆動力制御手段は、前記ノッチフィルタの出力信号の出力値に応じて、前記エンジンの駆動力を制御するとともに前記自動変速機の変速段を切り替えるように構成された車両の駆動力制御装置。
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