JP2015161293A - 内燃機関の排気浄化装置 - Google Patents
内燃機関の排気浄化装置 Download PDFInfo
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- JP2015161293A JP2015161293A JP2014038947A JP2014038947A JP2015161293A JP 2015161293 A JP2015161293 A JP 2015161293A JP 2014038947 A JP2014038947 A JP 2014038947A JP 2014038947 A JP2014038947 A JP 2014038947A JP 2015161293 A JP2015161293 A JP 2015161293A
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- temperature
- catalyst
- exhaust
- internal combustion
- combustion engine
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 38
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 128
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 128
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 123
- 238000002347 injection Methods 0.000 claims abstract description 61
- 239000007924 injection Substances 0.000 claims abstract description 61
- 239000003054 catalyst Substances 0.000 claims abstract description 40
- 239000000446 fuel Substances 0.000 claims abstract description 33
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 239000013618 particulate matter Substances 0.000 claims description 19
- 238000000746 purification Methods 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 5
- 230000001186 cumulative effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 238000010926 purge Methods 0.000 description 33
- 239000007789 gas Substances 0.000 description 26
- 238000000034 method Methods 0.000 description 23
- 238000001179 sorption measurement Methods 0.000 description 23
- 230000008929 regeneration Effects 0.000 description 21
- 238000011069 regeneration method Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 11
- 239000003463 adsorbent Substances 0.000 description 6
- 230000004913 activation Effects 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000003795 desorption Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010457 zeolite Substances 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
- 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
- F01N2900/1404—Exhaust gas temperature
-
- 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
- F01N2900/1602—Temperature of exhaust gas apparatus
-
- 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
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
-
- 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
- F02D2200/0802—Temperature of the exhaust gas treatment apparatus
-
- 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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Abstract
【解決手段】炭化水素を吸着酸化可能な触媒15を排気管に設けた内燃機関10の排気浄化装置14であって、触媒15の温度を検出する温度検出手段13と、温度検出手段13で検出される触媒15の温度が所定温度以下を示す時間を累積すると共に、累積時間から触媒15に吸着された炭化水素量を推定する推定手段40と、推定手段40で推定される炭化水素量が所定上限値を超えた場合に、触媒15に吸着された炭化水素が酸化する温度に触媒15の温度を上昇させる第1噴射モードで内燃機関10の燃料噴射を制御する制御手段40とを備えた。
【選択図】図1
Description
図1は、本発明の一実施形態に係る内燃機関及び排気浄化装置の構成を示す図である。本実施形態では内燃機関として、ディーゼルエンジン10(以下、単にエンジンという)が用いられている。
(1)通常モード
図2−1は、通常モードにおける燃料噴射制御を説明する図である。通常モードでは、上死点あるいはその近傍で燃料噴射(メイン噴射)を行う。なお、ここで述べた通常モードは、メイン噴射は1回としたが、その一例に過ぎず、必要とされる性能に応じて噴射を複数回(多段噴射)に分けて行ってもよい。
図2−2は、HCパージモードにおける燃料噴射制御を説明する図である。HCパージモードでは、メイン噴射に加え、その前後に各1回(プレ噴射とアフタ噴射)、それぞれメイン噴射での噴射量よりも少ない噴射量で噴射を行う。HCパージモードでは、通常モードよりも排気温度が高くなり、DOC15の温度は、HCの燃焼が可能な温度(活性温度θA)より高い目標温度θBまで上昇する。なお、ここで述べたHCパージモードの制御は、その一例に過ぎず、DOC15の温度を目標温度θBまで上昇させるものであれば他の制御内容でもよい。
DPF再生モードでは、最初にDOC15の温度を上昇させるための噴射(昇温工程:図2−3)を行い、その後、DOC15にHCを供給するための噴射(HC供給工程:図2−4)に切り替える。
図3は、HCパージにおけるDOC15の温度変化(実線)と、HCの吸着量の変化(破線)とを示す図である。図中、使用上限温度θLは、DOC15の顕著な劣化を起こさないための温度を表す。
図4は、エンジン10の運転に伴う排気温度の変化の例を示す図である。本実施形態では、排気温度センサ13が検出した温度θと時間Tとの関係に基づいて、DOC15のHC吸着量を推定し、HCパージを実行するか否かの判断を行う。この推定及び判断はECU40によって行われる。
図6は、DPF再生におけるDOC15の温度変化を示す図である。図中、実線は本実施形態のHCパージを行った場合、破線はHCパージを行わない場合の温度変化を示している。DPF再生は、排気中の未燃燃料(HC)をDOC15で燃焼させることで、DOC15の温度を上昇させ、DPF16に流入する排気温度をPM燃焼温度まで昇温させることにより行われる。
本実施形態のHCパージは、ECU40のプログラムの書き換えを行うことにより可能となり、この制御のためにエンジン10及びインジェクタ21の設計変更等を行う必要はない。さらに、HCパージを行う判断は、排気温度センサ13による検出温度θに基づいて行われており、排気温度センサ13は、エンジン10の運転状態、DPF再生の際の温度制御等にも用いられている部品である。
図7は、本発明の他の一実施形態に係る内燃機関及び排気浄化装置を示す図である。この実施形態と上記実施形態とで構成上異なるのはエンジン10と排気後処理装置14との間に、燃料噴射ノズル18が設けられている点である。
12 排気通路
13 排気温度センサ
14 排気後処理装置
15 DOC(酸化触媒)
16 DPF(ディーゼル・パティキュレート・フィルタ)
40 ECU
Claims (4)
- 炭化水素を吸着酸化可能な触媒を排気管に設けた内燃機関の排気浄化装置であって、
前記触媒の温度を検出する温度検出手段と、
前記温度検出手段で検出される前記触媒の温度が第1の所定温度以下を示す時間を累積すると共に、該累積時間から前記触媒に吸着された炭化水素量を推定する推定手段と、
前記推定手段で推定される前記炭化水素量が所定上限値を超えた場合に、前記触媒に吸着された炭化水素が酸化する温度に前記触媒の温度を上昇させる第1噴射モードで前記内燃機関の燃料噴射を制御する制御手段と、を備える
内燃機関の排気浄化装置。 - 前記温度検出手段で検出される前記触媒の温度が所定時間連続して前記第1の所定温度より低い第2の所定温度以上となった場合は、前記累積時間を減算する
請求項1に記載の排気浄化装置。 - 前記触媒よりも下流側の前記排気管に設けられて排気ガス中の粒子状物質を捕集するフィルタをさらに備え、
前記制御手段は、前記フィルタに堆積した粒子状物質が所定量を超えると、前記触媒の温度を粒子状物質の燃焼温度まで上昇させる第2噴射モードで前記内燃機関の燃料噴射を制御する
請求項1又は2に記載の排気浄化装置。 - 前記制御手段は、前記第1噴射モードの実行中は前記第2噴射モードの実行を禁止する
請求項3に記載の排気浄化装置。
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PCT/JP2015/053786 WO2015129463A1 (ja) | 2014-02-28 | 2015-02-12 | 内燃機関の排気浄化装置 |
US15/307,618 US10054027B2 (en) | 2014-02-28 | 2015-02-12 | Exhaust purification apparatus for internal combustion engine |
EP15755930.3A EP3112628B1 (en) | 2014-02-28 | 2015-02-12 | Exhaust purification apparatus for internal combustion engine |
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JP2023091274A (ja) * | 2021-12-20 | 2023-06-30 | いすゞ自動車株式会社 | 排気ガス温度制御装置 |
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CN114961951B (zh) * | 2022-05-10 | 2023-12-15 | 潍柴动力股份有限公司 | Doc硫中毒的主动监控方法、装置及系统 |
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JP2002364345A (ja) * | 2001-06-08 | 2002-12-18 | Nissan Motor Co Ltd | 内燃機関の排気浄化装置 |
JP2008128062A (ja) * | 2006-11-20 | 2008-06-05 | Toyota Motor Corp | 内燃機関の制御装置 |
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JP2004108320A (ja) * | 2002-09-20 | 2004-04-08 | Isuzu Motors Ltd | 排気ガス浄化方法及びそのシステム |
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JP4711006B2 (ja) * | 2009-05-18 | 2011-06-29 | 三菱自動車工業株式会社 | 排気浄化装置 |
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JP2008128062A (ja) * | 2006-11-20 | 2008-06-05 | Toyota Motor Corp | 内燃機関の制御装置 |
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WO2020050310A1 (ja) * | 2018-09-05 | 2020-03-12 | いすゞ自動車株式会社 | 排気浄化装置および排気浄化方法 |
JP7135612B2 (ja) | 2018-09-05 | 2022-09-13 | いすゞ自動車株式会社 | 排気浄化装置および排気浄化方法 |
US11499456B2 (en) | 2018-09-05 | 2022-11-15 | Isuzu Motors Limited | Exhaust purification device and exhaust purification method |
JP2023091274A (ja) * | 2021-12-20 | 2023-06-30 | いすゞ自動車株式会社 | 排気ガス温度制御装置 |
JP7334775B2 (ja) | 2021-12-20 | 2023-08-29 | いすゞ自動車株式会社 | 排気ガス温度制御装置 |
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