JP2008120266A - ハイブリッド車両の燃料性状推定装置 - Google Patents
ハイブリッド車両の燃料性状推定装置 Download PDFInfo
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- JP2008120266A JP2008120266A JP2006306902A JP2006306902A JP2008120266A JP 2008120266 A JP2008120266 A JP 2008120266A JP 2006306902 A JP2006306902 A JP 2006306902A JP 2006306902 A JP2006306902 A JP 2006306902A JP 2008120266 A JP2008120266 A JP 2008120266A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/082—Premixed fuels, i.e. emulsions or blends
- F02D19/085—Control based on the fuel type or composition
- F02D19/087—Control based on the fuel type or composition with determination of densities, viscosities, composition, concentration or mixture ratios of fuels
- F02D19/088—Control based on the fuel type or composition with determination of densities, viscosities, composition, concentration or mixture ratios of fuels by estimation, i.e. without using direct measurements of a corresponding sensor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—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
- B60K6/20—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
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Abstract
【解決手段】ハイブリッド車両10において、ECU100は噴射量制御処理を実行する。当該処理では、要求出力Pwnに対するエンジン200の実出力Pwrの過不足量たる出力過不足量ΔPwが算出される。出力過不足量ΔPwが上限値以上である場合、相対的に低発熱量燃料であると推定され、MG2によりトルクのアシストが実行される。また、出力過不足量ΔPwが下限値未満である場合、相対的に高発熱燃料であると推定され、MG1によりトルクの吸収が実行される。この結果、エンジンの出力異常に伴うドライバビリティの悪化が抑制される。このようにドライバビリティの悪化が抑制された状態で、出力過不足量ΔPwに基づいて推定された燃料性状が燃料噴射量に反映され、エンジンの出力異常が解消される。
【選択図】図5
Description
以下、図面を参照して、本発明の好適な各種実施形態について説明する。
<1:第1実施形態>
<1−1:実施形態の構成>
<1−1−1:ハイブリッド車両の構成>
始めに、図1を参照して、本発明の第1実施形態に係るハイブリッド車両10の構成について説明する。ここに、図1は、ハイブリッド車両10のブロック図である。
車輪12は、車軸11を介して伝達される動力を路面に伝達する手段であり、図1においては左右一輪ずつが示されるが、実際には、前後左右に一輪ずつ備わりハイブリッド車両10全体で計4個備わっている。
次に、図3を参照して、エンジン200の要部構成について、その動作の一部を交えて説明する。ここに、図3は、エンジン200の模式図である。尚、図2において、図1と重複する箇所には同一の符合を付してその説明を適宜省略することとする。
<1−2−1:ハイブリッド車両10の基本動作>
図1のハイブリッド車両10においては、主として発電機として機能するモータジェネレータMG1、主として電動機として機能するモータジェネレータMG2、及びエンジン200の夫々の動力配分がECU100及び動力分割機構300により制御され、走行状態が制御される。以下に、幾つかの状況に応じたハイブリッド車両10の動作について説明する。
例えば、ハイブリッド車両10の始動時においては、バッテリ500の電気エネルギを用いて駆動されるモータジェネレータMG1が電動機として機能する。この動力によってエンジン200がクランキングされエンジン200が始動する。
発進時には、SOCセンサ600の出力信号に基づいたバッテリ500の蓄電状態に応じて2種類の態様を採り得る。例えば、通常の(即ち、SOCが良好な)発進時においては、モータジェネレータMG1によってバッテリ500を充電する必要は生じないため、エンジン200は暖機のためだけに始動し、ハイブリッド車両10は、モータジェネレータMG2の動力により発進する。一方、蓄電状態が良好ではない(即ち、SOCが低下している)場合、エンジン200の動力によりモータジェネレータMG1が発電機として機能し、バッテリ500が充電される。
例えば、低速走行時や緩やかな坂を下っている場合には、比較的エンジン200の効率が悪い為、インジェクタ214を介した燃料の噴射が停止されることによりエンジン200が停止され、ハイブリッド車両10は、モータジェネレータMG2による動力のみで走行する。尚、この際、SOCが低下していれば、エンジン200はモータジェネレータMG1を駆動するために始動し、モータジェネレータMG1によりバッテリ500の充電が行われる。
エンジン200の効率(例えば、燃焼効率等)が比較的良好な運転領域においては、ハイブリッド車両10は主としてエンジン200の動力によって走行する。この際、エンジン200の動力は、動力分割機構300によって2系統に分割され、一方は、車軸11を介して車輪12に伝達され、他方は、モータジェネレータMG1を駆動して発電を行う。更に、この発電された電力により、モータジェネレータMG2が駆動され、モータジェネレータMG2によりエンジン200の動力がアシストされる。尚、この際、SOCが低下している場合には、エンジン200の出力を上昇させて、モータジェネレータMG1により発電された電力の一部がバッテリ500へ充電される。
減速が行われる際には、車輪12から車軸11を介して伝達される動力によってモータジェネレータMG2を回転させ、発電機として動作させる。これにより、車輪12の運動エネルギが電気エネルギに変換され、バッテリ500が充電される、所謂「回生」が行われる。
次に、エンジン200の基本的な制御動作について説明する。ECU100は、エンジン200に要求される出力であるエンジン要求出力を、一定の周期で繰り返し演算している。この際、ECU100は、アクセルポジションセンサ800によって検出されるアクセル開度及び車速センサ700によって検出される車速に基づいて、予めROMに格納されたマップから現時点におけるアクセル開度及び車速に対応した出力軸トルク(車軸11に出力されるべきトルク)を算出する。
ハイブリッド車両10において、エンジン200に使用される燃料は、その燃料性状(例えば、アルコール含有比率等)が変化する。燃料性状が変化すると理論空燃比が変化し、より具体的には、アルコール含有比率が高い程理論空燃比は小さくなり、アルコール含有比率が低い程理論空燃比は大きくなる。或いは燃料が相対的に低発熱量の燃料であればエンジン200の出力は相対的に低下し、燃料が相対的に高発熱量の燃料であればエンジン200の出力は相対的に上昇する。
ここで、図5を参照し、噴射量制御処理の詳細について説明する。ここに、図5は、噴射量制御処理のフローチャートである。
<2:第2実施形態>
第1実施形態では、要求出力Pwnに対する実出力Pwrの過不足量を、MG1によるトルクの吸収、及びMG2によるトルクアシストにより補償し、燃料性状の推定期間中におけるドライバビリティの悪化が抑制されているが、例えば、バッテリ500のSOCが例えば所定の上限値を超えた過充電状態に相当する場合、MG1によるトルクの吸収は実質的に不可能となる。また、同様にSOCが所定の下限値を下回った電力不足の状態では、MG2によるトルクのアシストが実質的に不可能となる。このような場合には、ECU100が出力過不足量ΔPwに基づいて燃料を推定し、実際の燃料噴射量に反映させるのに要する時間が相対的にみて短時間であったとしても、エンジン200の出力異常がドライバビリティの悪化を招く可能性がある。
Claims (8)
- 燃料を供給する供給手段を備えると共に車軸に連結された駆動軸に対し動力を出力可能な内燃機関、前記駆動軸に動力を出力可能な電動機、前記内燃機関の動力の一部により発電可能な発電機、及び該発電により得られる電力により充電可能なバッテリを備えたハイブリッド車両において、前記供給される燃料に係る燃料性状を推定するハイブリッド車両の燃料性状推定装置であって、
前記内燃機関における、要求出力に対する実出力の過不足量を特定する特定手段と、
前記駆動軸に前記要求出力に対応する動力が出力されるように前記特定される過不足量に応じて前記電動機及び前記発電機を制御する第1の制御手段と、
前記過不足量に基づいて前記燃料性状を推定する推定手段と
を具備することを特徴とするハイブリッド車両の燃料性状推定装置。 - 前記ハイブリッド車両は、前記内燃機関の動力を入力軸及び前記駆動軸に夫々所定の比率で分配する動力分配手段を更に具備し、
前記発電機には、前記内燃機関の動力の一部として前記入力軸を介して前記分配された動力が入力され、
前記電動機は、前記バッテリから供給される電力又は前記発電により得られる電力により駆動され、
前記特定手段は、前記入力軸を介して入力される前記分配された動力に基づいて前記過不足量を特定する
ことを特徴とする請求項1に記載のハイブリッド車両の燃料性状推定装置。 - 前記第1の制御手段は、前記要求出力に対し前記実出力が不足する場合に前記駆動軸に動力が出力されるように前記電動機を制御すると共に、前記要求出力に対し前記実出力が過剰な場合に前記内燃機関の動力の一部が前記発電に供されるように前記発電機を制御する
ことを特徴とする請求項1又は2に記載のハイブリッド車両の燃料性状推定装置。 - 前記内燃機関は、排気の圧力による過給が可能な過給器、及び該過給器における過給圧を調整可能な過給圧調整手段を更に備え、
前記第1の制御手段は、前記駆動軸に前記要求出力に応じた動力が出力されるように前記特定された過不足量に応じて前記過給圧調整手段を制御する
ことを特徴とする請求項1から3のいずれか一項に記載のハイブリッド車両の燃料性状推定装置。 - 前記過給圧調整手段は、開閉状態に応じて前記過給器に流入する前記排気の量を調整可能な開閉弁を含む
ことを特徴とする請求項4に記載のハイブリッド車両の燃料性状推定装置。 - 前記第1の制御手段は、前記特定された過不足量に応じて前記過給圧調整手段を制御した後、前記駆動軸に前記要求出力に応じた動力が出力されるように前記電動機及び前記発電機を更に制御する
ことを特徴とする請求項4又は5に記載のハイブリッド車両の燃料性状推定装置。 - 前記推定手段は、前記特定された過不足量が所定の上限値以上である場合、及び所定の下限値未満である場合のうち少なくとも一方において前記燃料性状を推定する
ことを特徴とする請求項1から6のいずれか一項に記載のハイブリッド車両の燃料性状推定装置。 - 前記推定された燃料性状に基づいて前記燃料の供給量を補正する補正手段と、
該補正された燃料が供給されるように前記供給手段を制御する第2の制御手段と
を更に具備することを特徴とする請求項1から7のいずれか一項に記載のハイブリッド車両の燃料性状推定装置。
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101922382A (zh) * | 2009-05-26 | 2010-12-22 | 通用汽车环球科技运作公司 | 燃料稳定性的方法和系统 |
JP2014159228A (ja) * | 2013-02-20 | 2014-09-04 | Toyota Motor Corp | ハイブリッド自動車 |
JPWO2012173160A1 (ja) * | 2011-06-14 | 2015-02-23 | 住友建機株式会社 | ハイブリッド型作業機械及びその制御方法 |
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