JP7115913B2 - 車両の制御装置及び制御方法 - Google Patents
車両の制御装置及び制御方法 Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Hybrid Electric Vehicles (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Exhaust Gas After Treatment (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
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Description
まず、本発明の実施の形態に係る車両の制御装置を適用可能なハイブリッド車両の構成例を説明する。図1は、車両の制御装置100を備えたハイブリッド車両1を示す模式図である。以下、パワーユニット10と制御装置100とに分けて、ハイブリッド車両1の全体構成例を説明する。
ハイブリッド車両1のパワーユニット10は、動力源としてエンジン11及びモータジェネレータ31を備える。モータジェネレータ31は走行用モータとして機能する。また、パワーユニット10は、プライマリプーリ27及びセカンダリプーリ29を有する無段変速機(以下、「CVT」ともいう。)25を備える。
ハイブリッド車両1の制御装置100の全体構成を説明する。図1に示すように、ハイブリッド車両1は、パワーユニット10の作動状態を制御するため、マイクロコンピュータ等を備える各種コントローラを備える。各種コントローラとして、エンジンコントローラ103、ミッションコントローラ105、モータコントローラ107、バッテリコントローラ109及びメインコントローラ101が備えられている。
次に、コースト走行時の車両減速制御の基本動作について説明する。コースト走行時とは、アクセルペダル及びブレーキペダルの踏み込みがともに解除される車両減速時、つまりドライバによるアクセル操作とブレーキ操作とがともに解除される車両減速時をいう。
燃料カット制御が開始されると、エンジン11から排出される排気は大気に支配される。このため、燃料カット制御の開始から所定時間経過後の酸素濃度センサのセンサ信号の値が、大気の酸素濃度に相当する値になるか否かを監視することにより、酸素濃度センサの故障の有無を判定することができる。このときの所定時間は、あらかじめ実験等により設定することができる。
同様に、燃料カット制御が開始されると、エンジン11から排出される排気は大気に支配される。このため、燃料カット制御の開始から所定時間経過後の空燃比センサのセンサ信号の値が、大気相当の空燃比の値になるか否かを監視することにより、空燃比センサの故障の有無を判定することができる。このときの所定時間は、あらかじめ実験等により設定することができる。
EGR(Exhaust Gas Recirculation)装置では、EGRバルブを開いたときに吸気通路に生じる負圧により排気が吸気側に導入される。燃料カット制御中にはエンジン11の負荷変動は極めて小さいことから、EGR装置が正常である場合、EGRバルブの開閉に伴って吸気圧が比較的大きく変動する。このため、燃料カット制御中に、EGRバルブを強制的に全開にしたときの吸気圧と、EGRバルブを強制的に全閉にしたときの吸気圧との差があらかじめ設定した閾値を超えるか否かを判定することにより、EGR装置の故障の有無を判定することができる。
エンジン11の排気系には排気ガスの浄化に用いられる排気浄化触媒が備えられている。例えばガソリンエンジンの排気系には、排気中の炭化水素(HC)、一酸化炭素(CO)及び窒素酸化物(NO)を削減する三元触媒が備えられている。三元触媒は、劣化に伴って酸素吸蔵能力が低下する特性を有する。このため、燃料カット制御を所定時間実行した場合に、三元触媒の酸素吸蔵能力に応じた量の酸素が三元触媒に吸蔵される。
次に、上記の解放ディレイ制御を実行可能な本実施形態に係るハイブリッド車両1の制御装置100の具体例を説明する。
例えばメインコントローラ101及びモータコントローラ107が回生制御部121として機能する。回生制御部121は、ハイブリッド車両1の減速時にモータジェネレータ31を回生駆動する。具体的に、回生制御部121は、アクセルセンサ81からの入力信号に基づいてアクセルペダルの踏み込みの解除を検出したときに、モータジェネレータ31を回生状態に制御する。
例えばメインコントローラ101及びエンジンコントローラ103が燃料噴射制御部123として機能する。燃料噴射制御部123は、アクセルセンサ81からの入力信号に基づいてアクセルペダルの踏み込みの解除を検出したときに、燃料噴射を停止する。具体的に、燃料噴射制御部123は、インジェクタ15による燃料噴射制御を中断する。
例えばメインコントローラ101及びミッションコントローラ105がクラッチ制御部125として機能する。クラッチ制御部125は、回生制御部121による回生駆動の実行時に、エンジンクラッチ23を解放する。具体的に、クラッチ制御部125は、バルブユニット113を制御してエンジンクラッチ23を解放する。ただし、クラッチ制御部125は、ディレイ制御部129から、クラッチ解放ディレイ要求が生成されている間、エンジンクラッチ23を締結状態のままで待機させる。
例えばメインコントローラ101が条件成立判定部127として機能する。条件成立判定部127は、燃料カット状態を利用して実行される複数の診断の実行条件がすべて成立しているか否かを判定する。本実施形態において、条件成立判定部127は、上記の診断(a)~(d)の実行条件がすべて成立しているか否かを判定する。
例えばメインコントローラ101がディレイ制御部129として機能する。ディレイ制御部129は、回生制御部121による回生駆動の実行開始時に複数の診断の実行条件がすべて成立している場合に、エンジンクラッチ23の解放を遅らせるクラッチ解放ディレイ要求を生成する。ディレイ制御部129は、例えば、上記の診断(a)~(d)において燃料カット状態で実行すべき制御に要する時間よりも長い時間にあらかじめ設定されたディレイ時間の間、クラッチ解放ディレイ要求を生成してもよい。あるいは、ディレイ制御部129は、上記の診断(a)~(d)において燃料カット状態で実行すべき処理が終了するまでの間、クラッチ解放ディレイ要求を生成してもよい。
例えばメインコントローラ101及びエンジンコントローラ103が診断制御部131として機能する。診断制御部131は、それぞれの診断の内容に応じて、スロットルバルブ13又はEGR装置等を制御して、あらかじめ定められた複数の診断を実行する。それぞれの診断制御の処理のうち、燃料カット状態で行われる処理は燃料カット制御中に実行される。
次に、本実施形態に係るハイブリッド車両1の制御装置100によるコースト走行時のエンジンクラッチ23の切り離し制御処理を説明する。
11 エンジン
21 トルクコンバータ
23 エンジンクラッチ
25 無段変速機(CVT)
31 モータジェネレータ
47 駆動輪
100 車両の制御装置
121 回生制御部
123 燃料噴射制御部
125 クラッチ制御部
127 条件成立判定部
129 ディレイ制御部
131 診断制御部
Claims (6)
- 駆動輪に連結される走行用モータ及びエンジンを備えたハイブリッド車両を制御する車両の制御装置において、
前記ハイブリッド車両の減速時に前記走行用モータを回生駆動する回生制御部と、
前記減速時に燃料噴射を停止する燃料噴射制御部と、
前記回生駆動時に前記エンジンと前記駆動輪との間の動力伝達の可否を切り換えるクラッチを解放するクラッチ制御部と、
前記クラッチを締結し、かつ、燃料噴射を停止した燃料カット状態で行われる複数の診断に関する複数の実行条件がすべて成立しているか否かを判定する条件成立判定部と、
前記クラッチが締結された状態で前記ハイブリッド車両が減速し前記回生駆動が開始される時に前記複数の診断に関する複数の実行条件がすべて成立している場合に前記クラッチの解放を遅らせるディレイ制御部と、
を備える、車両の制御装置。 - 前記ディレイ制御部は、前記クラッチの解放を遅らせている間に、前記クラッチの解放許可条件が成立したときに前記クラッチの解放を許可する、請求項1に記載の車両の制御装置。
- 前記ディレイ制御部は、前記クラッチの解放許可条件として、前記複数の診断において、前記燃料カット状態で実行すべき処理が終了したか否かを判定する、請求項2に記載の車両の制御装置。
- 前記ディレイ制御部は、前記クラッチの解放許可条件として、あらかじめ設定された時間が経過したか否かを判定する、請求項2に記載の車両の制御装置。
- 前記診断が、排気通路に設けられる酸素濃度センサの診断、空燃比センサの診断、EGRバルブの診断又は触媒の診断のうちの少なくとも2つを含む、請求項1~4のいずれか1項に記載の車両の制御装置。
- 駆動輪に連結される走行用モータ及びエンジンを備えたハイブリッド車両の減速時に前記エンジンへの燃料噴射を停止するとともに前記走行用モータを回生駆動する制御する車両の制御方法において、
前記回生駆動時に前記エンジンと前記駆動輪との間の動力伝達の可否を切り換えるクラッチを解放するステップを備え、
前記クラッチが締結された状態で前記ハイブリッド車両が減速し前記回生駆動が開始される時に、燃料カット状態で行われる複数の診断に関する複数の実行条件がすべて成立している場合には前記クラッチの解放を遅らせる、車両の制御方法。
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