JP2008155831A - 車両用駆動装置の制御装置 - Google Patents
車両用駆動装置の制御装置 Download PDFInfo
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Abstract
【解決手段】エンジンから駆動輪に至る動力伝達経路に、差動部の回転要素に連結された電動機の運転状態が制御されることにより、入力軸回転速度と出力軸回転速度との差動状態が制御される電気式差動部と、動力伝達経路の一部を構成し有段の自動変速部として機能する変速部とを備える車両用駆動装置において、前記有段変速部のダウン変速の際には前記エンジンの回転速度の変動が抑制されるよう前記電動機の出力トルクを制御する制御装置であって、前記電動機の出力トルクの制御は、前記電動機のイナーシャトルク分だけ前記出力トルクを増加させることにより、変速ショックが低減される。
【選択図】図9
Description
ΔNM1p=((1/ρ1)×NM2a−((1+ρ1)/ρ1)×NEtgt)−((1/ρ1)×NM2b−(1+ρ1)/ρ1×NEtgt) ・・・(1)
これは、第1電動機M1の回転速度NM1、第2電動機M2の回転速度NM2およびエンジン回転速度NEは、第1遊星歯車装置24の拘束条件に基づき、そのギヤ比ρ1を用いて次式(2)の関係を有すること、また、変速に要する時間が非常に短いものであって変速前後でエンジンの回転速度NEほぼ変化しない、すなわち変速後の目標エンジン回転速度NEtgtは変速前のエンジン回転速度と等しいみなすことができることによるものである。
NM1=(1/ρ1)×NM2−((1+ρ1)/ρ1)×NE ・・・(2)
なお、第1電動機回転速度変化率推定手段52は、第1電動機M1の回転速度変化率を算出する際に変速後の第2電動機M2の回転速度の推定値NM2aを用いることから、算出される第1電動機回転速度変化率は推定値である。また、第2電動機M2の実際の回転速度は例えば電動機に付近に設けられた図示しないレゾルバによって検出される。
ΔNM1=((1/ρ1)×NM2(t−Δt2)−((1+ρ1)/ρ1)×NEtgt)−((1/ρ1)×NM2(t)−(1+ρ1)/ρ1×NEtgt) ・・・(3)
なお、本第1電動機回転速度変化率算出手段54においても、先の第1電動機回転速度変化率推定手段52と同様に、変速前後でエンジンの回転速度NEはほとんど変化しない、すなわち変速後の目標エンジン回転速度NEtgtは変速前のエンジン回転速度とほぼ等しいことを前提としている。
C(%)=(N18n−N18b)/(N18a−N18b)×100 ・・・(4)
ここで、入力軸18は第2電動機M2と連結されていることから、入力軸18の回転速度N18は第2電動機M2の回転速度NM2と等しく、従って例えば第2電動機M2に設けられた図示しないレゾルバなどによって検出された第2電動機M2の回転速度NM2が用いられれば良い。この場合、上記(4)式において、N18a=NM2a,N18b=NM2bである。
ΔTM1=IM1×ΔNM1/Δt1 ・・・(5)
ここで、IM1(kg・m2 )は第1電動機M1の慣性モーメントであり、設計上算出される値である。また、Δt1は目標変速時間すなわち、前記変速実行手段50によって変速実行の判断がされてから、実際に変速が完了するまでに要する時間であって、予め設計者によって設定されるものである。
dN18n/dt=(N18n(t)−N18n(t−Δt))/Δt ・・・(6)
のようにして算出される。また、前記所定時間trとは、第1電動機の応答遅れを考慮するものであって、前記復帰手段66により第1電動機の出力トルクがTM1aとする指令がされてから、実際にかかるトルクが出力されるのに要する時間と同じか略等しい時間であることが望ましく、かかる時間は予め実験的にあるいはシミュレーションにより算出される。
ΔNE/Δt=(NE(t)−NE(t−Δt))/Δt
のように算出される。そして、本ステップの判断が肯定される場合には、SB6以降が実行される一方、本ステップの判断が否定される場合には、本ステップが繰り返され、本ステップの判断が肯定されるまで待機させられる。
8:車両用駆動装置
11:無段変速部
18:伝達部材
20:有段変速部
16:差動機構
24:第1遊星歯車装置
38:駆動輪
40:車両用駆動装置の制御装置(電子制御装置)
M1:第1電動機
M2:第2電動機
Claims (7)
- エンジンから駆動輪に至る動力伝達経路に、差動部の回転要素に連結された電動機の運転状態が制御されることにより、入力軸回転速度と出力軸回転速度との差動状態が制御される電気式差動部と、動力伝達経路の一部を構成し有段の自動変速部として機能する変速部とを備える車両用駆動装置において、前記有段変速部のダウン変速の際には前記エンジンの回転速度の変動が抑制されるよう前記電動機の出力トルクを制御する制御装置であって、
前記電動機の出力トルクの制御は、前記電動機のイナーシャトルク分だけ前記出力トルクを増加させるものであることを特徴とする車両用駆動装置の制御装置。 - 前記差動部は、前記エンジンに連結された第1要素と第1電動機に連結された第2要素と伝達部材に連結された第3要素とを有する差動機構と、該伝達部材と駆動輪との間の動力伝達経路に設けられた第2電動機とを有するものであり、
前記有段変速部のダウン変速の際には、前記エンジンの回転速度の変動が抑制されるよう前記第1電動機の出力トルクを制御し、
前記第1電動機の出力トルクの制御は、前記第1電動機のイナーシャトルク分だけ前記出力トルクを増加させるものであることを特徴とする請求項1に記載の車両用駆動装置の制御装置。 - 前記第1電動機のイナーシャトルクは、前記ダウン変速の完了時における前記第2電動機の目標回転速度、前記ダウン変速の完了時における前記エンジンの目標回転速度、変速開始前における前記第2電動機の回転速度、および目標変速時間に基づいて算出されることを特徴とする請求項2に記載の車両用駆動装置の制御装置。
- 前記第1電動機のイナーシャトルクは、前記第2電動機の実際の回転速度の変化量、および前記ダウン変速の完了時における前記エンジンの目標回転速度に基づいて算出されることを特徴とする請求項2または3に記載の車両用駆動装置の制御装置。
- 前記第1電動機の出力トルクの制御は、前記エンジンの回転速度の変化量が所定値以上の場合に実行されることを特徴とする請求項2乃至4のいずれかに記載の車両用駆動装置の制御装置。
- 前記ダウン変速実行中であってイナーシャ相の開始前に、前記第1電動機の出力トルクを所定量だけ増加することを特徴とする請求項2乃至5のいずれかに記載の車両用駆動装置の制御装置。
- 前記電気的差動部は、電動機の運転状態が制御されることにより、無段変速機構として作動することを特徴とする請求項1乃至6のいずれかに記載の車両駆動装置の制御装置。
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