JP6277994B2 - ハイブリッド車両の制御装置 - Google Patents
ハイブリッド車両の制御装置 Download PDFInfo
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- JP6277994B2 JP6277994B2 JP2015091107A JP2015091107A JP6277994B2 JP 6277994 B2 JP6277994 B2 JP 6277994B2 JP 2015091107 A JP2015091107 A JP 2015091107A JP 2015091107 A JP2015091107 A JP 2015091107A JP 6277994 B2 JP6277994 B2 JP 6277994B2
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- combustion
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- power
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- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
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- B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
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- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
- B60W20/14—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion in conjunction with braking regeneration
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- Transportation (AREA)
- Automation & Control Theory (AREA)
- General Engineering & Computer Science (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Control Of Transmission Device (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
ストイキ燃焼運転とリーン燃焼運転との間の運転モードの切り替えは、エンジン回転数とエンジントルクとで定義されたストイキ燃焼領域及びリーン燃焼領域のいずれに現在の運転条件が属するか否かをECU30が判定することにより実施される。内燃機関2の運転条件がストイキ燃焼領域又はリーン燃焼領域のいずれか一方の領域に属する状態からいずれか他方の領域に属する状態に変化した場合、ECU30は運転モードの切り替え要求を発生させ、その後空燃比を変更して運転モードを切り替える。運転モードの切り替え要求は燃焼モードの変更要求に相当する。
リーン燃焼運転を続けると不図示の排気浄化触媒に吸蔵されたNOxの量が増えていき排気浄化触媒の浄化機能が劣化する。ECU30はNOxの吸蔵量に相関する各種パラメータを参照して上述したリッチスパイクの必要性を判断する。そしてECU30はリッチスパイクの実施が必要となった場合にリッチスパイクの実施要求を発生させる。リッチスパイクの実施要求は燃焼モードの変更要求に相当する。ECU30はリッチスパイクの実施要求が成立した場合にリッチスパイクを実施する。リッチスパイクの実施は上述したように一時的な燃料増量を伴うので内燃機関2のエンジンパワーは増加する。増加したエンジンパワーがそのまま駆動軸23から出力されると出力変動が生じて車両1の乗員はショックを感じる。そのため、ECU30はリッチスパイクに伴うエンジンパワーの増加を相殺する方向に第2モータ・ジェネレータ4を制御して出力変動を抑制する。
ECU30は所定のシフトスケジュール又は運転者によるシフトチェンジ要求等に基づいて変速要求を発生させる。そして、ECU30は変速要求に対応する変速段が実現されるように自動変速機10のクラッチC1、C2及びブレーキB1、B2を制御する。自動変速機10の変更操作の開始から変速操作の完了までの期間は自動変速機10の入力側の回転速度がほぼ一定のトルク相の期間とその回転速度が変化するイナーシャ相の期間とに区分される(図4等参照)。
本形態は、リッチスパイクの実施要求及びリーン燃焼運転とストイキ燃焼運転との間の運転モードの切り替え要求等の燃焼モードの変更要求と、自動変速機10に対する変速要求とが重なった場合にECU30が実施する制御に特徴がある。上述したように、燃焼モードの変更には、エンジンパワーの増加を伴うものとして、リッチスパイクの実施及びリーン燃焼運転からストイキ燃焼運転への切り替えがあり、エンジンパワーの減少を伴うものとして、ストイキ燃焼運転からリーン燃焼運転への切り替えがある。また、変速操作には、自動変速機10の入力側の回転速度を上昇させる力行モードを実施する場合と、その回転速度を低下させる回生モードを実施する場合とがある。なお、燃焼モードの変更要求と変速要求とが「重なった場合」には、「変速要求が発生してから実際に変速操作が開始される前、すなわち上記したトルク相の期間が開始するまでの間に、燃焼モードの変更要求が発生した場合」の他、「変速要求が発生して実際に変速操作が開始されてからトルク相の期間が終了するまでの間、すなわちトルク相の期間中に燃焼モードの変更要求が発生した場合」、および「変速要求と同時に燃焼モードの変更要求が発生した場合」が含まれる。また、「重なった場合」には、「燃焼モード変更要求が発生してから実際に燃焼モードの変更が実施されるまでの間に変速要求が発生した場合」も含まれる。
図4にはダウンシフトの変速要求とリッチスパイクの実施要求とが重なった場合の各パラメータの時間的変化が示されている。図4のケースでは、時刻t1でダウンシフトの変速要求が発生し、時刻t2でリッチスパイクの実施要求が発生している。後発のリッチスパイクの実施要求の発生時点でダウンシフト及びリッチスパイクのいずれも処理開始前であるので、これらの要求が重なった状態となっている。なお、ダウンシフトの変速要求とリッチスパイクの実施要求とが同時に又は図4のケースとは逆にリッチスパイクの実施要求がダウンシフトの変速要求よりも前に発生した場合でもこれらの要求が重なった状態となる。
上述したように、リーン燃焼運転からストイキ燃焼運転への切り替えは一時的な燃料増量により実施されるのでエンジンパワーの増加を伴う。この切り替えは、エンジンパワーの増加を伴う点でリッチスパイクの実施と共通し、この切り替え要求と変速要求とが重なった場合に実施される処理内容は、上述したリッチスパイクの実施時に行う処理と同様である。したがって、この処理内容は、上述した説明文及び図6のフローチャート中の「リッチスパイク」の部分を「リーン燃焼運転からストイキ燃焼運転への切り替え」に読み替えたものと同じである。そのため、重複する説明を省略する。
図7にはダウンシフトの変速要求とストイキ燃焼運転からリーン燃焼運転への切り替え要求とが重なった場合の各パラメータの時間的変化が示されている。このケースでは、時刻t1でダウンシフトの変速要求が発生し、時刻t2でストイキ燃焼運転からリーン燃焼運転への切り替え要求が発生している。2つの要求が重なることについての解釈は上述と同じである。
2 内燃機関
4 第2モータ・ジェネレータ(モータ・ジェネレータ)
10 自動変速機(変速機構)
Claims (7)
- 空燃比の変化を伴う燃焼モードの変更を実施可能な内燃機関と、バッテリに電気的に接続されたモータ・ジェネレータとが変速機構の入力側に設けられたハイブリッド車両に適用される制御装置において、
前記バッテリの電力を用いて前記モータ・ジェネレータを力行する力行モードと前記モータ・ジェネレータにて回生制御を実施して前記バッテリを充電する回生モードとを選択的に実施可能なモータ制御手段と、
前記燃焼モードの変更要求と前記変速機構の変速要求とが重なった場合に、前記燃焼モードの変更を前記変速機構に対する変速操作中のイナーシャ相の期間内に又は前記変速操作の完了後に実施するエンジン制御手段と、を備え、
前記エンジン制御手段は、前記燃焼モードの変更がエンジンパワーの増加を伴うものであり、かつ前記変速操作中に前記変速機構の入力側の回転速度を上昇させるために前記力行モードが実施される場合には、前記燃焼モードの変更を前記変速操作中のイナーシャ相の期間内に実施し、前記燃焼モードの変更がエンジンパワーの増加を伴うものであり、かつ前記変速操作中に前記回生モードが実施される場合には、前記燃焼モードの変更を前記変速操作の完了後に実施する、ことを特徴とするハイブリッド車両の制御装置。 - 前記エンジン制御手段は、前記燃焼モードの変更によるエンジンパワーの増加を相殺する方向へエンジントルクを制御せずに前記燃焼モードの変更を実施する、請求項1に記載の制御装置。
- 前記内燃機関は、理論空燃比及びその近辺を目標とするストイキ燃焼運転と、前記ストイキ燃焼運転の目標よりもリーン側の空燃比を目標とするリーン燃焼運転とを切り替えることが可能であり、かつ前記リーン燃焼運転中に空燃比を一時的にリッチ側に変化させるリッチスパイクが実施されるリーンバーンエンジンとして構成されており、
エンジンパワーの増加を伴う前記燃焼モードの変更が、前記リーン燃焼運転から前記ストイキ燃焼運転への切り替え又は前記リッチスパイクの実施である請求項1又は2に記載の制御装置。 - 前記エンジン制御手段は、前記燃焼モードの変更がエンジンパワーの減少を伴うものであり、かつ前記変速操作中に前記力行モードが実施される場合には、前記燃焼モードの変更を前記変速操作の完了後に実施し、前記燃焼モードの変更がエンジンパワーの減少を伴うものであり、かつ前記変速操作中に前記回生モードが実施される場合には、前記燃焼モードの変更を前記変速操作中のイナーシャ相の期間内に実施する、請求項1又は2に記載の制御装置。
- 前記内燃機関は、理論空燃比及びその近辺を目標とするストイキ燃焼運転と、前記ストイキ燃焼運転の目標よりもリーン側の空燃比を目標とするリーン燃焼運転とを切り替えることが可能であり、かつ前記リーン燃焼運転中に空燃比を一時的にリッチ側に変化させるリッチスパイクが実施されるリーンバーンエンジンとして構成されており、
エンジンパワーの増加を伴う前記燃焼モードの変更が、前記リーン燃焼運転から前記ストイキ燃焼運転への切り替え又は前記リッチスパイクの実施であり、
エンジンパワーの減少を伴う前記燃焼モードの変更が、前記ストイキ燃焼運転から前記リーン燃焼運転への切り替えである、請求項4に記載の制御装置。 - 空燃比の変化を伴う燃焼モードの変更を実施可能な内燃機関と、バッテリに電気的に接続されたモータ・ジェネレータとが変速機構の入力側に設けられたハイブリッド車両に適用される制御装置において、
前記バッテリの電力を用いて前記モータ・ジェネレータを力行する力行モードと前記モータ・ジェネレータにて回生制御を実施して前記バッテリを充電する回生モードとを選択的に実施可能なモータ制御手段と、
前記燃焼モードの変更要求と前記変速機構の変速要求とが重なった場合に、前記燃焼モードの変更を前記変速機構に対する変速操作中のイナーシャ相の期間内に又は前記変速操作の完了後に実施するエンジン制御手段と、を備え、
前記エンジン制御手段は、前記燃焼モードの変更がエンジンパワーの減少を伴うものであり、かつ前記変速操作中に前記変速機構の入力側の回転速度を上昇させるために前記力行モードが実施される場合には、前記燃焼モードの変更を前記変速操作の完了後に実施し、前記燃焼モードの変更がエンジンパワーの減少を伴うものであり、かつ前記変速操作中に前記回生モードが実施される場合には、前記燃焼モードの変更を前記変速操作中のイナーシャ相の期間内に実施する、ことを特徴とするハイブリッド車両の制御装置。 - 前記内燃機関は、理論空燃比及びその近辺を目標とするストイキ燃焼運転と、前記ストイキ燃焼運転の目標よりもリーン側の空燃比を目標とするリーン燃焼運転とを切り替えることが可能であり、かつ前記リーン燃焼運転中に空燃比を一時的にリッチ側に変化させるリッチスパイクが実施されるリーンバーンエンジンとして構成されており、
エンジンパワーの減少を伴う前記燃焼モードの変更が、前記ストイキ燃焼運転から前記リーン燃焼運転への切り替えである、請求項6に記載の制御装置。
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