JP2019127128A - ハイブリッド車の排気浄化システム - Google Patents
ハイブリッド車の排気浄化システム Download PDFInfo
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- JP2019127128A JP2019127128A JP2018009533A JP2018009533A JP2019127128A JP 2019127128 A JP2019127128 A JP 2019127128A JP 2018009533 A JP2018009533 A JP 2018009533A JP 2018009533 A JP2018009533 A JP 2018009533A JP 2019127128 A JP2019127128 A JP 2019127128A
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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
- 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 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/42—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 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
- B60K6/44—Series-parallel type
- B60K6/445—Differential gearing distribution type
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
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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
- 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 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—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 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
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- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
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- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
- F01N3/0842—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N3/0871—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents using means for controlling, e.g. purging, the absorbents or adsorbents
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/36—Arrangements for supply of additional fuel
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- F01N9/00—Electrical control of exhaust gas treating apparatus
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D31/001—Electric control of rotation speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F02D41/402—Multiple injections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
Description
ともに、該内燃機関のみによって要求トルクを補償することになる。そうなると、内燃機関の機関回転速度を低減させていたときには、NSR触媒におけるNOx還元の進行状況にかかわらず、該機関回転速度を上昇させることが必要となる。また、内燃機関の運転を停止させていたときには、NSR触媒におけるNOx還元の進行状況にかかわらず、該内燃機関の運転を再開させることになる。
るように、内燃機関の運転状態を制御することで発電機による発電を行う。
(ハイブリッドシステムおよび内燃機関の吸排気系の概略構成)
図1は、本実施例に係るハイブリッドシステムおよび内燃機関の吸排気系の概略構成を示す図である。車両100に搭載されたハイブリッドシステム50は、内燃機関1、動力分割機構51、電動モータ52、発電機53、バッテリ54、インバータ55、減速機57を備えている。減速機57は、車両100の車軸56に接続されている。車軸56の両端には車輪58が接続されている。
トルクである要求トルクを算出する。
また、ECU20は、内燃機関1の運転中、燃料噴射弁3からの燃料噴射量、流入排気の流量、流入排気の空燃比、および、NSR触媒4の温度等に基づいて、NSR触媒4におけるNOx吸蔵量を随時推定する。そして、本実施例では、ECU20によって推定されたNOx吸蔵量が所定吸蔵量に達すると、該ECU20は、NSR触媒4のNOx吸蔵能力を回復させるべくNOx還元処理を実行する。NOx還元処理は、内燃機関1の各気筒2において、燃料噴射弁3によって、圧縮上死点近傍の時期に実行される主燃料噴射に加え副燃料噴射を実行し、それによって、還元剤となる燃料をNSR触媒4に供給することで実現される。なお、ここでの副燃料噴射は、一燃焼サイクル中における主燃料噴射よりも後の時期であって、噴射された燃料が機関出力に寄与する気筒2内での燃焼に供されない時期に実行される燃料噴射である。このとき、NSR触媒4内の空燃比が、該NSR触媒4に吸蔵されたNOxの還元が可能なリッチ空燃比となるように副燃料噴射量が調整される。また、所定吸蔵量は、NSR触媒4のNOx吸蔵能力の回復を実行すべきNOx吸蔵量の閾値として、実験等に基づいて予め定められている。なお、本実施例においては、NSR触媒4におけるNOx吸蔵量が所定吸蔵量に達したときに燃料噴射弁3によって副燃料噴射を実行することでNOx還元処理を実現するECU20が、本発明に係る「NOx還元実行部」に相当する。
場合、NSR触媒4に燃料が供給された後で、内燃機関1の運転が停止されることで該NSR触媒4に新たに排気が流入しなくなる。そうすると、NSR触媒4に燃料が供給された後も内燃機関1の運転が継続されている場合に比べて、NSR触媒4に供給される酸素量が減少し、さらに、NSR触媒4から排気によって持ち去られる熱量も減少する。そのため、NSR触媒4に燃料が供給された後も内燃機関1の運転が継続された場合に比べて、すなわち、所定の動力源制御を実行することなくNOx還元処理が実行された場合に比べて、NSR触媒4に吸蔵されたNOxをより効率的に還元することが可能となる。したがって、より少ない量の燃料で、所定吸蔵量のNOxを還元することが可能となる。そのため、NOx還元処理の実行に伴って所定の動力源制御が実行される場合の該NOx還元処理における所定供給量は、このような点を考慮して、実験等に基づいて予め定められている。
ともに、内燃機関1の運転が再開される。なお、NSR触媒4におけるNOx還元の完了時期と、所定の動力源制御の実行停止時期(すなわち、内燃機関1の運転再開時期)とは、必ずしも同時でなくてもよい。つまり、NSR触媒4におけるNOx還元が完了した後に、所定の動力源制御の実行が停止されてもよい。
以下、本実施例に係るNOx還元処理のフローについて図3に示すフローチャートに基づいて説明する。本フローは、ECU20に予め記憶されたプログラムが実行されることによって実現される。
ッテリ54のSOCが、S104で設定されたSOC下限値C1´より少ないか否かが判別される。S109において否定判定された場合、所定の動力源制御を継続することが可能と判断できる。この場合、S106の処理が再度実行される。一方、S109において肯定判定された場合、次に、S107において、所定の動力源制御の実行が停止される。つまり、電動モータ52の駆動を停止させるとともに、内燃機関1の運転を再開させる。この場合、NSR触媒4においてNOx還元が完了していない状態で、内燃機関1の運転が再開されることになる。ただし、所定の動力源制御の実行中にバッテリ54のSOCがSOC下限値C1´を下回る確率(すなわち、S109で肯定判定される確率)は、バッテリ54のSOCが、変更前のSOC下限値C1を下回る確率よりも、当然低くなる。
触媒4には未反応燃料がほぼ存在しない状態で内燃機関1の運転を再開させることができる。そのため、時期t7の直後においては、図2において時期t6直後に示されるようなNSR触媒4からのHC流出量の大幅な増加は発生しない。
次に、本実施例の変形例について説明する。上記実施例では、内燃機関1のみを車両100の動力源としているときにNOx還元処理を実行する際に本発明を適用した場合を例に挙げて説明した。しかしながら、車両100の動力源として内燃機関1と電動モータ52とを併用しているときにNOx還元処理を実行する際にも本発明を適用することができる。この場合も、車両100の動力源として内燃機関1と電動モータ52とを併用しているときにNSR触媒4におけるNOx吸蔵量Qnoxが所定吸蔵量Qnox1に達すると、NOx還元処理が実行され、さらに、該NOx還元処理の実行に伴い所定の駆動源制御が実行される。そして、所定の動力源制御の実行期間中においては、SOC下限値が、該所定の動力源制御の実行期間以外の時より小さい値に変更される。
また、上記実施例では、所定の駆動源制御において、内燃機関1の運転を停止させた。しかしながら、所定の駆動源制御では、必ずしも、内燃機関1の運転を停止させる必要はなく、内燃機関1の運転を継続しつつ、その機関回転速度を通常運転時よりも低減させてもよい。ここで、通常運転とは、要求トルクに応じて予め定められている内燃機関の運転状態のことである。なお、当然のことながら、この場合においても、内燃機関1の機関回転速度の低減に伴うトルクの低下を補うために電動モータ52が制御される。
また、図1に示す構成において、さらに、NSR触媒4よりも上流側の排気通路11に、排気中に燃料を添加する燃料添加弁を設けてもよい。そして、NOx還元処理を実行する際に、上述した各気筒2での副燃料噴射に代えて、燃料添加弁から燃料を添加することでNSR触媒4に燃料を供給してもよい。また、排気通路11に排気が流れていない状態でも燃料添加弁から添加された燃料がNSR触媒4に到達するように、排気通路11におけるNSR触媒4の直上流に燃料添加弁を設けてもよい。このような構成によれば、所定の駆動源制御において内燃機関1の運転を停止させる場合であっても、該内燃機関1の運転停止後にNOx還元処理を実行することができる。
2・・・気筒
3・・・燃料噴射弁
4・・・吸蔵還元型NOx触媒(NSR触媒)
10・・吸気通路
11・・排気通路
12・・エアフローメータ
13・・スロットル弁
14・・空燃比センサ
15・・排気温度センサ
20・・ECU
50・・ハイブリッドシステム
51・・動力分割機構
52・・電動モータ
53・・発電機
54・・バッテリ
55・・インバータ
56・・車軸
57・・減速機
58・・車輪
100・・車両
Claims (1)
- 希薄燃焼運転を行う内燃機関および電動モータを動力源として有するハイブリッド車であって、前記内燃機関から出力される動力によって発電する発電機と、前記発電機によって発電された電力により充電され且つ前記電動モータに電力を供給するバッテリと、前記内燃機関の運転状態および前記電動モータの駆動状態を制御する制御部と、を備えたハイブリッド車の排気浄化システムであって、
前記内燃機関の排気通路に設けられた吸蔵還元型NOx触媒と、
所定のNOx還元実行条件が成立したときに、前記吸蔵還元型NOx触媒に還元剤たる燃料を供給することで、前記吸蔵還元型NOx触媒に吸蔵されたNOxを還元させるNOx還元処理を実行するNOx還元実行部と、
前記バッテリの充電量を取得するSOC取得部と、を備え、
前記制御部は、前記SOC取得部によって取得される前記バッテリの充電量が所定の目標SOC範囲内に維持されるように、前記内燃機関の運転状態を制御することで前記発電機によって発電を行い、且つ、
前記NOx還元実行部による前記NOx還元処理の実行に伴って、前記制御部は、前記内燃機関の機関回転速度を低減させるかまたは前記内燃機関の運転を停止させるとともに、要求トルクを補償すべく前記電動モータを制御する、所定の動力源制御を実行し、さらに、
前記制御部は、前記所定の動力源制御の実行期間中においては、前記所定の目標SOC範囲の下限値を、前記所定の動力源制御の実行期間以外の時より小さい値に変更するハイブリッド車の排気浄化システム。
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| CN201910038996.8A CN110067622B (zh) | 2018-01-24 | 2019-01-16 | 混合动力车的排气净化系统 |
| US16/248,865 US11168597B2 (en) | 2018-01-24 | 2019-01-16 | Exhaust gas purification system for a hybrid vehicle |
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| US20190226373A1 (en) | 2019-07-25 |
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