EXHAUST EMISSION CONTROL DEVICE AND EXHAUST EMISSION CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE
EXHAUST EMISSION CONTROL DEVICE AND EXHAUST EMISSION CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE
- Neue Suche nach: ODA TOMIHISA
- Neue Suche nach: ODA TOMIHISA
To suppress deterioration of exhaust emissions during outflow of HC and NOx from an adsorbent disposed in an exhaust passage of an internal combustion engine.SOLUTION: An exhaust emission control device for an internal combustion engine includes: an adsorbent 20 that is disposed in an exhaust passage of the internal combustion engine 50 and adsorbs HC and NOx in exhaust gas; a catalyst 24 that is disposed on the downstream side in the exhaust gas flowing direction of the adsorbent in the exhaust passage and eliminates HC and NOx; an air-fuel ratio control section 31 for controlling an air-fuel ratio of exhaust gas discharged from an engine body of the internal combustion engine to the exhaust passage; and a temperature calculation section 32 for calculating a temperature of the adsorbent. In the adsorbent, a desorption temperature of HC is higher than that of NOx. When the temperature of the adsorbent is around the desorption temperature of NOx, the air-fuel control section sets the air-fuel ratio to a theoretical air-fuel ratio, and then, when the temperature of the adsorbent reaches a temperature around the desorption temperature of HC, the air-fuel ratio control section makes the air-fuel ratio leaner than the theoretical air-fuel ratio.SELECTED DRAWING: Figure 3
【課題】内燃機関の排気通路に配置された吸着材からＨＣ及びＮＯｘが流出する際に排気エミッションが悪化することを抑制する。【解決手段】内燃機関の排気浄化装置は、内燃機関５０の排気通路に配置されると共に排気ガス中のＨＣ及びＮＯｘを吸着する吸着材２０と、排気通路において吸着材よりも排気流れ方向下流側に配置されると共にＨＣ及びＮＯｘを浄化する触媒２４と、内燃機関の機関本体から排気通路に排出される排気ガスの空燃比を制御する空燃比制御部３１と、吸着材の温度を算出する温度算出部３２とを備える。吸着材においてＨＣの脱離温度がＮＯｘの脱離温度よりも高く、空燃比制御部は、吸着材の温度がＮＯｘの脱離温度近傍にあるときに空燃比を理論空燃比にし、その後、吸着材の温度がＨＣの脱離温度近傍に達したときに空燃比を理論空燃比よりもリーンにする。【選択図】図３
Dokumentinformationen
EXHAUST EMISSION CONTROL DEVICE AND EXHAUST EMISSION CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE
内燃機関の排気浄化装置及び排気浄化方法
2020-02-27
Patent
Elektronische Ressource
Japanisch
| IPC: | F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein / B01D SEPARATION , Trennen / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen |
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