JP7028255B2 - ハイブリッド車両の触媒暖機制御方法、及びハイブリッド車両の触媒暖機制御装置 - Google Patents
ハイブリッド車両の触媒暖機制御方法、及びハイブリッド車両の触媒暖機制御装置 Download PDFInfo
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- B60W2510/00—Input parameters relating to a particular sub-units
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- B60W2530/00—Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
- B60W2530/12—Catalyst or filter state
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- B60W2530/00—Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
- B60W2530/13—Mileage
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- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0644—Engine speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60W2710/00—Output or target parameters relating to a particular sub-units
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- B60W2710/0666—Engine torque
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- B60W2720/00—Output or target parameters relating to overall vehicle dynamics
- B60W2720/10—Longitudinal speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/90—Vehicles comprising electric prime movers
- B60Y2200/92—Hybrid vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/10—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle or its components
- F01N2900/104—Battery status
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1626—Catalyst activation temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Description
図1は、本実施形態が適用されるハイブリッド車両の構成を示すブロック図である。本実施形態が適用されるハイブリッド車両は、エンジン1と、発電機2と、バッテリ3と、電動モータ4と、車輪6(駆動輪)と、電動モータ4を制御するモータコントローラ7と、を備える。
図3は、車速と、触媒の暖機要求を行うための下限回転数及び暖機要求回転数と、車速との関係を表す図である。触媒(例えば、三元触媒)はエンジン1の作動中に排出される排ガスを浄化処理するものである。触媒は、暖機されることで浄化性能を発揮するが、特に所定の活性温度以上の温度になると高効率で排ガスを浄化可能となる。一方、車速が低いときは、一般的にエンジン1の目標回転数も低く制御され、排ガスの量も少なくなるので、触媒の温度は活性温度をある程度下回っても許容される。よって、本実施形態では、触媒を活性化させるための暖機要求温度を車速に基づいて定めている。
図4は、ハイブリッド車両におけるエンジン1の目標回転数及び目標トルクに係る動作点と、SOCにより定まる上限発電電力と、の関係を示す図である。図5は、ハイブリッド車両において暖機制御する際のエンジン1の目標回転数及び目標トルクに係る動作点と、SOCにより定まる上限発電電力と、の関係を示す図である。図4、図5は、横軸を目標回転数、縦軸を目標トルクとする特性座標を表している。
図6は、ハイブリッド車両において暖機制御をする場合の、エンジン1の実回転数、触媒の温度、触媒暖機要求信号のタイムチャートである。ここでは、チャージモード等によりエンジン1及び発電機2を用いてバッテリ3を充電したのち、マナーモードに切替えたときに暖機制御が開始する場合を想定している。
本実施形態は、バッテリ3が電動モータ4に電力を供給するとともに発電用のエンジン1によりバッテリ3を充電し、エンジン1から排出される排ガスを触媒で処理するハイブリッド車両の触媒暖機制御方法である。当該触媒暖機制御方法は、触媒の温度が触媒を活性化させるための暖機要求温度よりも低くなったときに、バッテリ3の充電率に基づいてエンジン1の目標回転数及び目標トルクを制御するとともに、目標回転数が触媒を暖機要求温度に加熱可能な下限回転数よりも低くなる場合に、目標回転数を下限回転数以上となる暖機要求回転数に制御する。
Claims (10)
- バッテリが電動モータに電力を供給するとともに発電用のエンジンにより前記バッテリを充電し、前記エンジンから排出される排ガスを触媒で処理するハイブリッド車両の触媒暖機制御方法であって、
前記触媒の温度が前記触媒を活性化させるための暖機要求温度よりも低くなったときに、前記バッテリの充電率に基づいて前記エンジンの目標回転数及び目標トルクを制御するとともに、前記目標回転数が前記触媒を前記暖機要求温度に加熱可能な下限回転数よりも低くなる場合に、前記目標回転数を前記下限回転数以上となる暖機要求回転数に制御し、
前記充電率が所定の上限値の近傍に到達する場合に前記エンジンの発電電力を制限するために前記充電率に基づいて上限発電電力を設定するとともに、前記触媒の温度が前記暖機要求温度よりも低くなったときに前記目標回転数を前記上限発電電力に関わらず前記暖機要求回転数に制御するハイブリッド車両の触媒暖機制御方法。 - 前記エンジンの燃費効率が最大となる最適化回転数及び最適化トルクに基づいて定められる最適化発電電力が、前記上限発電電力よりも低い場合には、前記目標回転数を前記最適化回転数に制御し、前記目標トルクを前記最適化トルクに制御する請求項1に記載のハイブリッド車両の触媒暖機制御方法。
- 前記目標回転数及び前記目標トルクを軸とする特性座標において、前記エンジンの動作点が前記エンジンにおいて異音が発生する異音発生領域の外部となる適正領域に含まれるように前記目標回転数及び前記目標トルクを制御し、
前記目標回転数が前記下限回転数よりも低くなる場合に、前記動作点を前記適正領域であって前記目標回転数が前記暖機要求回転数となる位置に移動させる請求項1に記載のハイブリッド車両の触媒暖機制御方法。 - 前記目標回転数及び前記目標トルクを軸とする特性座標において、前記エンジンにおいて異音が発生する異音発生領域と当該異音発生領域の外部となる適正領域との境界線と、前記上限発電電力を表す曲線と、が交差する場合において、
前記エンジンの動作点が、前記境界線と前記曲線との交差点に重なるように、前記目標回転数及び前記目標トルクを制御し、
前記目標回転数が前記下限回転数よりも低くなる場合に、前記動作点を前記境界線であって前記目標回転数が前記暖機要求回転数となる位置に移動させる請求項1に記載のハイブリッド車両の触媒暖機制御方法。 - 前記暖機要求温度及び前記暖機要求回転数を車速に基づいて定めることを特徴とする請求項1乃至4のいずれか1項に記載のハイブリッド車両の触媒暖機制御方法。
- 電動モータに電力を供給するバッテリと、
前記バッテリを充電するための発電用のエンジンと、
前記エンジンから排出される排ガスを処理する触媒と、を備えるハイブリッド車両の触媒暖機制御装置であって、
前記触媒暖機制御装置は、
前記触媒の温度が前記触媒を活性化させるための暖機要求温度よりも低くなったときに、触媒暖機を要求する触媒暖機要求信号を送信する触媒暖機要求演算部と、
前記触媒暖機要求信号を受信して前記エンジンの目標回転数及び目標トルクを制御する発電電力制御部と、を備え、
前記触媒暖機要求演算部は、
前記目標回転数が前記触媒を前記暖機要求温度よりも高く加熱可能な下限回転数よりも低くなる場合に、前記下限回転数以上となる暖機要求回転数の情報を前記発電電力制御部に送信し、
前記発電電力制御部は、
前記暖機要求回転数の情報を受信すると、前記目標回転数を前記暖機要求回転数に制御し、
前記バッテリの充電率が所定の上限値の近傍に到達する場合に前記エンジンの発電電力を制限するために前記充電率に基づいて上限発電電力を設定するとともに、前記触媒の温度が前記暖機要求温度よりも低くなったときに前記目標回転数を前記上限発電電力に関わらず前記暖機要求回転数に制御するハイブリッド車両の触媒暖機制御装置。 - 前記発電電力制御部は、
前記エンジンの燃費効率が最大となる最適化回転数及び最適化トルクに基づいて定められる最適化発電電力が前記上限発電電力よりも低い場合には、前記目標回転数を前記最適化回転数に制御し、前記目標トルクを前記最適化トルクに制御する請求項6に記載のハイブリッド車両の触媒暖機制御装置。 - 前記発電電力制御部は、
前記目標回転数及び前記目標トルクを軸とする特性座標において、前記エンジンの動作点が前記エンジンにおいて異音が発生する異音発生領域の外部となる適正領域に含まれるように前記目標回転数及び前記目標トルクを制御し、
前記目標回転数が前記下限回転数よりも低くなる場合に、前記動作点を前記適正領域であって前記目標回転数が前記暖機要求回転数となる位置に移動させる請求項6に記載のハイブリッド車両の触媒暖機制御装置。 - 前記発電電力制御部は、
前記目標回転数及び前記目標トルクを軸とする特性座標において、前記エンジンにおいて異音が発生する異音発生領域と当該異音発生領域の外部となる適正領域との境界線と、前記上限発電電力を表す曲線と、が交差する場合において、
前記目標回転数及び前記目標トルクに係る動作点が、前記境界線と前記曲線との交差点に重なるように、前記目標回転数及び前記目標トルクを制御し、
前記目標回転数が前記下限回転数よりも低くなる場合に、前記動作点を前記境界線であって前記目標回転数が前記暖機要求回転数となる位置に移動させる請求項6に記載のハイブリッド車両の触媒暖機制御装置。 - 前記触媒暖機要求演算部は、
前記暖機要求温度及び前記暖機要求回転数を車速に基づいて定める請求項6乃至9のいずれか1項に記載のハイブリッド車両の触媒暖機制御装置。
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