JP2016121591A - 酸素濃度センサの故障判定装置 - Google Patents
酸素濃度センサの故障判定装置 Download PDFInfo
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- JP2016121591A JP2016121591A JP2014261131A JP2014261131A JP2016121591A JP 2016121591 A JP2016121591 A JP 2016121591A JP 2014261131 A JP2014261131 A JP 2014261131A JP 2014261131 A JP2014261131 A JP 2014261131A JP 2016121591 A JP2016121591 A JP 2016121591A
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- failure determination
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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
- F01N3/18—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
- 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
- F02D41/1493—Details
- F02D41/1495—Detection of abnormalities in the air/fuel ratio feedback system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/4175—Calibrating or checking the analyser
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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
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
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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
- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
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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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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Physics & Mathematics (AREA)
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- Toxicology (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
(実施形態1)
本発明の故障判定装置が適用されたエンジン1(内燃機関)の吸排気系の概略構成図である。
図1に示すように、エンジン1の吸気通路2には、吸入空気流量を調節する電子制御式のスロットルバルブ10が設けられている。スロットルバルブ10には、スロットルバルブ10の開き度合を検出するスロットルポジションセンサ11が備えられている。
更にエンジン1には、クランク角を検出するクランク角センサ20、図示しないカム角センサや水温センサや等のエンジン1の運転状況を検出するセンサが設けられている。
エンジン1の排気通路3には、三元触媒等の排気浄化触媒30が介装されている。
ECU40の入力側には、上記スロットルポジションセンサ11、エアフローセンサ12、クランク角センサ20、上流側酸素濃度センサ31、下流側酸素濃度センサ32、及び図示しない水温センサ、アクセルの開度を検出するアクセルポジションセンサ、車速センサ、その他エンジン1及び車両の運転状態を検出するセンサ類からの検出情報が入力される。
下流側酸素濃度センサ32の故障判定は、エンジン運転中に燃料カットモードに移行して燃料噴射を停止(燃料カット)した際に、下流側酸素濃度センサ32により検出した排気の空燃比の変化に基づいて下流側酸素濃度センサ32の故障判定を行う(故障判定手段)。
図4には実施形態2に係る故障判定禁止を説明するタイムチャートを示す。
図4は、図2と同様に、燃料カットモード解除後のリッチ化制御モードにおける下流側酸素濃度センサ32の出力値Vの推移並びにストイキオ燃焼に必要な燃料供給量に対するリッチ分の燃料供給量ΔF及びその時間平均ΔFaveの推移の一例を示すタイムチャートであり、図2と同一部分については重複する説明は省略する。
2 吸気通路
3 排気通路
4 燃料噴射弁
10 スロットルバルブ
11 スロットルポジションセンサ
12 エアフローセンサ
20 クランク角センサ
30 排気浄化触媒
31 上流側酸素濃度センサ
32 下流側酸素濃度センサ
40 ECU
Claims (4)
- 内燃機関の排気系に設けられた触媒の下流側に配置された酸素濃度センサの故障判定装置であって、内燃機関の燃料カットモードの解除後のリッチ化制御中の前記酸素濃度センサの出力が所定の出力区間を通過する期間の大きさ又は前記解除後のリッチ化制御中の前記酸素濃度センサの出力が所定出力になるまでの期間の大きさに基づいて当該酸素濃度センサの故障判定をする故障判定手段と、前記リッチ化制御中の実際の燃料供給量から、ストイキオ燃焼に必要な燃料供給量に対するリッチ分の燃料供給量の時間平均を算出するリッチ燃料供給量算出手段と、前記リッチ燃料供給量に基づいて前記故障判定手段の故障判定を制限する故障判定制限手段と、を備えたことを特徴とする酸素濃度センサの故障判定装置。
- 請求項1に記載の酸素濃度センサの故障判定装置において、前記故障判定制限手段は、前記リッチ燃料供給量が所定値以下の場合に前記故障判定手段の故障判定を制限することを特徴とする酸素濃度センサの故障判定装置。
- 請求項1又は2に記載の酸素濃度センサの故障判定装置において、前記故障判定手段は、前記リッチ化制御中の前記酸素濃度センサの出力が所定の出力区間を通過する期間の大きさが所定の故障判定値より大きい場合に故障判定をすることを特徴とする酸素濃度センサの故障判定装置。
- 請求項3に記載の酸素濃度センサの故障判定装置において、前記故障判定制限手段は、前記リッチ燃料供給量が所定値以下の場合に、前記故障判定手段の前記故障判定値を大きく設定することを特徴とする酸素濃度センサの故障判定装置。
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JP2014261131A JP6414466B2 (ja) | 2014-12-24 | 2014-12-24 | 酸素濃度センサの故障判定装置 |
US14/935,624 US10393000B2 (en) | 2014-12-24 | 2015-11-09 | Failure determination apparatus for oxygen concentration sensor |
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JP2014261131A JP6414466B2 (ja) | 2014-12-24 | 2014-12-24 | 酸素濃度センサの故障判定装置 |
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US11435332B2 (en) * | 2020-09-25 | 2022-09-06 | GM Global Technology Operations LLC | Sensor offset diagnostic in idle and after-run |
CN114704362A (zh) * | 2021-04-26 | 2022-07-05 | 长城汽车股份有限公司 | 稀燃nox捕集器故障检测方法、装置、车辆、介质及设备 |
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