JP2019085961A - 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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- JP2019085961A JP2019085961A JP2017216544A JP2017216544A JP2019085961A JP 2019085961 A JP2019085961 A JP 2019085961A JP 2017216544 A JP2017216544 A JP 2017216544A JP 2017216544 A JP2017216544 A JP 2017216544A JP 2019085961 A JP2019085961 A JP 2019085961A
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- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
最初に図1〜図11を参照して、本発明の第一実施形態について説明する。
図1は、本発明の第一実施形態に係る内燃機関の排気浄化装置が設けられた内燃機関を概略的に示す図である。図1に示される内燃機関は火花点火式内燃機関である。内燃機関は車両に搭載される。
上流側触媒20及び下流側触媒24は排気通路に配置され、下流側触媒24は上流側触媒20の排気流れ方向下流側に配置される。上流側触媒20及び下流側触媒24は同様な構成を有する。触媒20、24は、酸素吸蔵能力を有する触媒であり、例えば三元触媒である。具体的には、触媒20、24は、セラミックから成る担体に、触媒作用を有する貴金属(例えば、白金(Pt))及び酸素吸蔵能力を有する助触媒(例えば、セリア(CeO2))を担持させたものである。
次に、図3及び図4を参照して、本実施形態における空燃比センサ40、41の出力特性について説明する。図3は、本実施形態における空燃比センサ40、41の電圧−電流(V−I)特性を示す図であり、図4は、印加電圧を一定に維持したときの、空燃比センサ40、41周りを流通する排気ガスの空燃比(以下、「排気空燃比」という)と出力電流Iとの関係を示す図である。なお、本実施形態では、両空燃比センサ40、41として同一構成の空燃比センサが用いられる。
以下、本発明の第一実施形態に係る内燃機関の排気浄化装置(以下、単に「排気浄化装置」という)について説明する。排気浄化装置は、上流側触媒20、下流側触媒24、上流側空燃比センサ40、下流側空燃比センサ41、空燃比制御部31及び温度算出部32を備える。本実施形態では、ECU30が空燃比制御部31及び温度算出部32として機能する。
具体的には、空燃比制御部31は、第1制御において、下流側空燃比センサ41の出力空燃比が理論空燃比に対して第1の側にずれた判定空燃比に達したときに、理論空燃比に対して第1の側とは反対側の第2の側にずれた第1設定空燃比に目標空燃比を設定し、目標空燃比が理論空燃比に対して第2の側にずれた空燃比に維持されているときの上流側触媒20の酸素吸蔵量の変化量が基準量に達したと判定したときに、理論空燃比に対して第1の側にずれた第2設定空燃比に目標空燃比を設定する。基準量は、予め定められ、上流側触媒20の最大酸素吸蔵量よりも少ない値に設定される。なお、第1制御は片側破綻制御とも称される。
OED=0.23×(AFup−14.6)×Qi …(1)
ここで、0.23は空気中の酸素濃度であり、14.6は理論空燃比であり、Qiは燃料噴射量であり、AFupは上流側空燃比センサ40の出力空燃比である。
OED=0.23×(AFup−14.6)×Ga/AFup …(2)
ここで、0.23は空気中の酸素濃度であり、14.6は理論空燃比であり、Gaは吸入空気量であり、AFupは上流側空燃比センサ40の出力空燃比である。吸入空気量Gaはエアフロメータ39によって検出される。
DQi=Kp・DAF+Ki・SDAF+Kd・DDAF …(3)
一方、空燃比制御部31は、第2制御において、下流側空燃比センサ41の出力空燃比が理論空燃比よりもリッチなリッチ判定空燃比に達したときに、理論空燃比よりもリーンなリーン設定空燃比に目標空燃比を設定し、下流側空燃比センサ41の出力空燃比が理論空燃比よりもリーンなリーン判定空燃比に達したときに、理論空燃比よりもリッチなリッチ設定空燃比に目標空燃比を設定する。なお、第2制御は両側破綻制御とも称される。
第1制御が実行されると、下流側空燃比センサ41の出力空燃比が第1リッチ判定空燃比に達するときに、上流側触媒20から未燃ガスが流出する。一方、上流側触媒20の酸素吸蔵量が最大酸素吸蔵量に達する前に目標空燃比が第1リーン設定空燃比から第1リッチ設定空燃比に切り替えられるため、基本的に上流側触媒20からNOxは流出しない。
図7を参照して、本実施形態における空燃比制御について具体的に説明する。図7は、第一実施形態における空燃比制御が実行されるときの下流側触媒24の温度、空燃比制御の種類、流入排気ガスの目標空燃比、流入排気ガスの理論空燃比に対する酸素過不足量の積算値(積算酸素過不足量)、下流側空燃比センサ41の出力空燃比、上流側触媒20から流出する未燃ガスの量、及び上流側触媒20から流出するNOxの量のタイムチャートである。
図8は、第一実施形態における空燃比制御切替処理の制御ルーチンを示すフローチャートである。本制御ルーチンは、内燃機関の始動後、ECU30によって所定の時間間隔で繰り返し実行される。
図10は、第一実施形態における第1制御の制御ルーチンを示すフローチャートである。本制御ルーチンは、内燃機関の始動後、ECU30によって所定の時間間隔で繰り返し実行される。
図11は、第一実施形態における第2制御の制御ルーチンを示すフローチャートである。本制御ルーチンは、内燃機関の始動後、ECU30によって所定の時間間隔で繰り返し実行される。
第二実施形態における内燃機関の排気浄化装置の構成及び制御は、以下に説明する点を除いて、基本的に第一実施形態における内燃機関の排気浄化装置と同様である。このため、以下、本発明の第二実施形態について、第一実施形態と異なる部分を中心に説明する。
図12を参照して、第二実施形態における空燃比制御について具体的に説明する。図12は、第二実施形態における空燃比制御が実行されるときの下流側触媒24の温度、空燃比制御の種類、流入排気ガスの目標空燃比、流入排気ガスの理論空燃比に対する酸素過不足量の積算値(積算酸素過不足量)、下流側空燃比センサ41の出力空燃比、上流側触媒20から流出する未燃ガスの量、及び上流側触媒20から流出するNOxの量のタイムチャートである。
第二実施形態においても、第1実施形態と同様に、図8の空燃比制御切替処理の制御ルーチン及び図11の第2制御の制御ルーチンが実行される。図13は、第二実施形態における第1制御の制御ルーチンを示すフローチャートである。本制御ルーチンは、内燃機関の始動後、ECU30によって所定の時間間隔で繰り返し実行される。
第三実施形態における内燃機関の排気浄化装置の構成及び制御は、以下に説明する点を除いて、基本的に第一実施形態における内燃機関の排気浄化装置と同様である。このため、以下、本発明の第三実施形態について、第一実施形態と異なる部分を中心に説明する。
図15は、第三実施形態における基準温度設定処理の制御ルーチンを示すフローチャートである。本制御ルーチンは、内燃機関の始動後、ECU30によって所定の時間間隔で繰り返し実行される。
24 下流側触媒
30 ECU
31 空燃比制御部
32 温度算出部
33 触媒劣化算出部
41 下流側空燃比センサ
Claims (8)
- 排気通路に配置されると共に酸素を吸蔵可能な上流側触媒と、
前記上流側触媒の排気流れ方向下流側に配置されると共に酸素を吸蔵可能な下流側触媒と、
前記上流側触媒と前記下流側触媒との間に配置されると共に、前記上流側触媒から流出する流出排気ガスの空燃比を検出する空燃比センサと、
前記上流側触媒に流入する流入排気ガスの空燃比を目標空燃比に制御する空燃比制御部と、
前記下流側触媒の温度を算出する温度算出部と
を備え、
前記空燃比制御部は第1制御及び第2制御を実行し、
前記空燃比制御部は、前記第1制御において、前記空燃比センサによって検出された空燃比が理論空燃比に対して第1の側にずれた判定空燃比に達したときに、理論空燃比に対して前記第1の側とは反対側の第2の側にずれた第1設定空燃比に前記目標空燃比を設定し、前記目標空燃比が理論空燃比に対して前記第2の側にずれた空燃比に維持されているときの前記上流側触媒の酸素吸蔵量の変化量が該上流側触媒の最大酸素吸蔵量よりも少ない基準量に達したと判定したときに、理論空燃比に対して前記第1の側にずれた第2設定空燃比に前記目標空燃比を設定し、
前記空燃比制御部は、前記第2制御において、前記空燃比センサによって検出された空燃比が理論空燃比よりもリッチなリッチ判定空燃比に達したときに、理論空燃比よりもリーンなリーン設定空燃比に前記目標空燃比を設定し、前記空燃比センサによって検出された空燃比が理論空燃比よりもリーンなリーン判定空燃比に達したときに、理論空燃比よりもリッチなリッチ設定空燃比に前記目標空燃比を設定し、
前記空燃比制御部は、前記温度算出部によって算出された前記下流側触媒の温度が該下流側触媒の活性温度以上の基準温度まで上昇したときに前記第1制御から前記第2制御への切替を行う、内燃機関の排気浄化装置。 - 前記空燃比制御部は、前記温度算出部によって算出された前記下流側触媒の温度が前記基準温度未満に低下したときに前記第2制御から前記第1制御への切替を行う、請求項1に記載の内燃機関の排気浄化装置。
- 前記下流側触媒の劣化度合を算出する触媒劣化算出部を更に備え、
前記空燃比制御部は、前記触媒劣化算出部によって算出された前記下流側触媒の劣化度合が大きいほど、前記基準温度を高くする、請求項1又は2に記載の内燃機関の排気浄化装置。 - 前記触媒劣化算出部は前記下流側触媒の温度履歴に基づいて前記下流側触媒の劣化度合を算出する、請求項3に記載の内燃機関の排気浄化装置。
- 前記触媒劣化算出部は、前記内燃機関の燃焼室への燃料供給が停止される燃料カット制御が実行された時間の合計に基づいて、前記下流側触媒の劣化度合を算出する、請求項4に記載の内燃機関の排気浄化装置。
- 前記触媒劣化算出部は、前記内燃機関を搭載した車両の総走行距離又は前記内燃機関の総運転時間に基づいて、前記下流側触媒の劣化度合を算出する、請求項3に記載の内燃機関の排気浄化装置。
- 前記第1の側がリッチ側であり、前記第2の側がリーン側である、請求項1から6のいずれか1項に記載の内燃機関の排気浄化装置。
- 前記第1の側がリーン側であり、前記第2の側がリッチ側である、請求項1から6のいずれか1項に記載の内燃機関の排気浄化装置。
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