JP2021076102A - 内燃機関の制御装置 - Google Patents
内燃機関の制御装置 Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 239000000446 fuel Substances 0.000 claims abstract description 138
- 239000003054 catalyst Substances 0.000 claims abstract description 60
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000001301 oxygen Substances 0.000 claims abstract description 52
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 52
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 45
- 230000008569 process Effects 0.000 claims description 41
- 238000000746 purification Methods 0.000 abstract description 11
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 230000007423 decrease Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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
- 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
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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
- 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 ; Methods of operation or control of catalytic converters
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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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
- 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
- F01N3/24—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
- F01N3/28—Construction of catalytic reactors
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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
- 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
- F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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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
- F01N2900/1624—Catalyst oxygen storage capacity
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/08—Exhaust gas treatment apparatus parameters
- F02D2200/0814—Oxygen storage amount
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
Abstract
【解決手段】内燃機関10は、排気通路13に設けられた触媒18と、触媒18を通過したガスの酸素濃度に比例した信号を出力する第2空燃比センサ20とを備える。制御装置100は、燃料カットからの復帰時に混合気の空燃比が理論空燃比よりもリッチになるように目標当量比を設定して燃料噴射を行うリッチ制御を実行する。また、制御装置100は、リッチ制御を開始するときの第2空燃比センサ20の出力値から算出される空気過剰率が大きいほど、リッチ制御の実行中に保持する目標当量比が大きい値となるように目標当量比を設定する目標当量比設定処理を実行する。
【選択図】図1
Description
以下、内燃機関の制御装置を具体化した第1実施形態について、図1〜図3を参照して説明する。
これら第1空燃比センサ19及び第2空燃比センサ20は、周知の限界電流式酸素センサである。この限界電流式酸素センサは、濃淡電池式酸素センサの検出部に拡散律速層と呼ばれるセラミック層を備えることにより排気の酸素濃度に比例した出力電流が得られるセンサであり、排気中の酸素濃度と密接な関係にある空燃比が理論空燃比である場合には、その出力電流は「0」になる。また、空燃比がリッチになるにつれて出力電流は負の方向に大きくなり、空燃比がリーンになるにつれて出力電流は正の方向に大きくなる。
式(1)の「0.23」は空気中の酸素の割合であり、「ΔA/F」は第1空燃比センサ19によって検出された空燃比から理論空燃比を減じた値である。また、「燃料噴射量Q」は、微小時間Δtの間にインジェクタ17から噴射された燃料量である。上記式(1)において、「ΔA/F」が正の値である場合には、微小時間Δtの間に触媒18に吸蔵された酸素の量が算出される。一方、「ΔA/F」が負の値である場合には、微小時間Δtの間に触媒18から放出された酸素の量が算出される。
なお、微小時間Δtにおける吸入空気量は、エアフロメータ16により検出される。
ここで、燃料カットが実行されると触媒18の酸素吸蔵量OSAは増加していくが、そうした酸素吸蔵量OSAが適正値Cを超えて過剰に多くなると、燃料カットの復帰後において混合気の燃焼が開始されたときに触媒18でのNOx還元が進みにくくなる。
(1)図3の時刻t1において燃料カットが開始されると、新気が触媒18を通過するため、リア空気過剰率λrの値は徐々に「1」よりも大きい値に変化していき、触媒18の酸素吸蔵量OSAが限界に達すると、それ以降は新気の酸素濃度に応じた一定の値になる。この燃料カットの実行中において吸入空気量GAの積算値が上記規定値を超えていると、時刻t2において燃料カットから復帰する際にリッチ制御が開始される。このリッチ制御が開始されると、理論空燃比よりもリッチな混合気が燃焼されて触媒18はリッチ雰囲気に曝されるようになり、吸蔵していた酸素の放出が促される。そして放出された酸素の一部は未燃燃料と反応することにより、リア空気過剰率λrの値はリーン側の値からストイキ側の値へと徐々に小さくなっていく。そして、リア空気過剰率λrが「1」近傍の値になる、あるいは酸素吸蔵量OSAが適正値Cにまで低下するとリッチ制御は終了される(時刻t5)。
すなわち、時刻t2にて、リッチ制御が開始されると、当該リッチ制御が開始されるときのリア空気過剰率λra、つまり時刻t2におけるリア空気過剰率λraが、上記過剰率記憶値λmの初期値として設定される。
次に、内燃機関の制御装置を具体化した第2実施形態について、図4を参照して説明する。
・リッチ制御の実行条件や、終了条件は適宜変更することができる。
11…吸気通路
13…排気通路
17…インジェクタ
18…触媒
20…第2空燃比センサ
100…制御装置
Claims (2)
- 排気通路に設けられた触媒と、前記触媒を通過したガスの酸素濃度に比例した信号を出力する空燃比センサとを備える内燃機関に適用されて、燃料カットからの復帰時に混合気の空燃比が理論空燃比よりもリッチになるように目標当量比を設定して燃料噴射を行うリッチ制御を実行する制御装置であって、
前記リッチ制御を開始するときの前記空燃比センサの出力値から算出される空気過剰率が大きいほど、前記リッチ制御の実行中に保持する前記目標当量比が大きい値となるように当該目標当量比を設定する目標当量比設定処理を実行する
内燃機関の制御装置。 - 排気通路に設けられた触媒と、前記触媒を通過したガスの酸素濃度に比例した信号を出力する空燃比センサとを備える内燃機関に適用されて、燃料カットからの復帰時に混合気の空燃比が理論空燃比よりもリッチになるように目標当量比を設定して燃料噴射を行うリッチ制御を実行する制御装置であって、
前記リッチ制御を開始するときの前記空燃比センサの出力値から算出される空気過剰率を過剰率記憶値の初期値に設定する設定処理と、
前記過剰率記憶値が大きい値であるほど、前記リッチ制御の実行中に保持する前記目標当量比が大きい値となるように当該目標当量比を設定する目標当量比設定処理と、
前記リッチ制御の実行中に前記空燃比センサの出力値から算出される空気過剰率が前記過剰率記憶値を超える毎に、その算出された空気過剰率を前記過剰率記憶値として設定する更新処理とを実行する
内燃機関の制御装置。
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JP2019205394A JP7243587B2 (ja) | 2019-11-13 | 2019-11-13 | 内燃機関の制御装置 |
US17/076,805 US11585285B2 (en) | 2019-11-13 | 2020-10-22 | Controller for internal combustion engine |
CN202011245252.2A CN112796859B (zh) | 2019-11-13 | 2020-11-10 | 内燃机的控制装置 |
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JP2002276433A (ja) * | 2001-03-23 | 2002-09-25 | Denso Corp | 内燃機関の排出ガス浄化制御装置 |
JP2005201112A (ja) * | 2004-01-14 | 2005-07-28 | Toyota Motor Corp | 内燃機関の燃料噴射制御装置 |
JP2017115620A (ja) * | 2015-12-22 | 2017-06-29 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
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DE3424532C1 (de) * | 1984-07-04 | 1986-01-23 | Daimler-Benz Ag, 7000 Stuttgart | Verfahren zur Optimierung des Kraftstoff-Luft-Verhaeltnisses im instationaeren Zustand bei einem Verbrennungsmotor |
JP3528739B2 (ja) * | 2000-02-16 | 2004-05-24 | 日産自動車株式会社 | エンジンの排気浄化装置 |
JP2002349325A (ja) * | 2001-03-19 | 2002-12-04 | Unisia Jecs Corp | 内燃機関の空燃比制御装置 |
JP2007231844A (ja) * | 2006-03-01 | 2007-09-13 | Mitsubishi Electric Corp | 内燃機関の制御装置 |
US8516796B2 (en) * | 2009-11-20 | 2013-08-27 | GM Global Technology Operations LLC | System and method for monitoring catalyst efficiency and post-catalyst oxygen sensor performance |
US10794310B2 (en) * | 2018-10-12 | 2020-10-06 | Hitachi Automotive Systems, Ltd. | Engine control system and method |
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JP2002276433A (ja) * | 2001-03-23 | 2002-09-25 | Denso Corp | 内燃機関の排出ガス浄化制御装置 |
JP2005201112A (ja) * | 2004-01-14 | 2005-07-28 | Toyota Motor Corp | 内燃機関の燃料噴射制御装置 |
JP2017115620A (ja) * | 2015-12-22 | 2017-06-29 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
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US11585285B2 (en) | 2023-02-21 |
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