JP2016079871A - オゾン添加制御装置 - Google Patents
オゾン添加制御装置Info
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Abstract
【解決手段】ECU40(オゾン添加制御装置)は、NOx浄化装置12、DOC14(酸化装置)およびオゾン添加装置15を備える排気浄化システムに適用されたものであり、第1取得手段41a、第2取得手段41bおよび制御手段41cを備える。NOx浄化装置12は、NOxを吸着、還元して浄化する吸着触媒を有する。DOC14は、COまたはHCを酸化する酸化触媒を有する。オゾン添加装置15は、排気通路10exのうち、NOx浄化装置12の上流側かつDOC14の下流側の部分へオゾンを添加する。第1取得手段41aは酸化触媒温度を取得し、第2取得手段41bは吸着触媒温度を取得する。制御手段41cは、取得した酸化触媒温度および吸着触媒温度に基づき、オゾン添加装置15によるオゾン添加量を制御する。
【選択図】図1
Description
図1に示す燃焼システムは、以下に詳述する内燃機関10、過給機11、NOx浄化装置12、微粒子捕集装置(DPF13)、酸化装置(DOC14)、オゾン添加装置15および還元剤添加装置16を備える。燃焼システムは車両に搭載されたものであり、当該車両は、内燃機関10の出力を駆動源として走行する。内燃機関10は、圧縮自着火式のディーゼルエンジンであり、燃焼に用いる燃料には、炭化水素化合物である軽油を用いている。内燃機関10は、基本的にはリーン状態で燃焼させるように作動する。つまり、燃焼室に噴射された燃料と燃焼室に吸入される空気との比率である空燃比が、空気過剰に設定された状態で燃焼(リーン燃焼)させている。
上記第1実施形態に係るNOx浄化装置12は、O2存在下においてNOxと選択的に還元剤を反応させてNOxを浄化させるものであり、HC選択還元触媒を有する。これに対し、本実施形態に係るNOx浄化装置12A(図10参照)は、内燃機関10をリーン状態で燃焼させる通常運転時にNOxを吸蔵し、定期的に実行されるリッチ状態での燃焼時に、吸蔵されたNOxをリッチ環境で還元して浄化させるものである。つまり、還元剤添加装置16AはNOx吸蔵還元触媒を有する。このように吸蔵するNOx吸蔵還元触媒の具体例として、バリウム等のアルカリ土類金属やリチウム等のアルカリ金属を白金に組合せた触媒が挙げられる。
以上、発明の好ましい実施形態について説明したが、発明は上述した実施形態に何ら制限されることなく、以下に例示するように種々変形して実施することが可能である。各実施形態で具体的に組合せが可能であることを明示している部分同士の組合せばかりではなく、特に組合せに支障が生じなければ、明示してなくとも実施形態同士を部分的に組み合せることも可能である。
Claims (6)
- 内燃機関(10)の排気に含まれるNOxを吸着、還元して浄化する吸着触媒を有したNOx浄化装置(12、12A)と、
前記内燃機関の排気に含まれるCOまたはHCを酸化する酸化触媒を有した酸化装置(14)と、
前記内燃機関の排気通路(10ex)のうち、前記NOx浄化装置の上流側かつ前記酸化装置の下流側の部分へオゾンを添加するオゾン添加装置(15)と、を備える排気浄化システムに適用されたオゾン添加制御装置(40)であって、
前記酸化触媒の温度である酸化触媒温度を取得する第1取得手段(41a)と、
前記吸着触媒の温度である吸着触媒温度を取得する第2取得手段(41b)と、
取得した前記酸化触媒温度および前記吸着触媒温度に基づき、前記オゾン添加装置によるオゾン添加量を制御する制御手段(41c)と、
を備えることを特徴とするオゾン添加制御装置。 - COまたはHCの酸化が生じる前記酸化触媒の温度領域をCO酸化領域とした場合において、
前記制御手段は、取得した前記酸化触媒温度が前記CO酸化領域であるか否かに基づき前記オゾン添加量を制御することを特徴とする請求項1に記載のオゾン添加制御装置。 - COまたはHCによるNO2の還元が生じる前記吸着触媒の温度領域をNO2還元領域とした場合において、
前記制御手段は、取得した前記吸着触媒温度が前記NO2還元領域であるか否かに基づき前記オゾン添加量を制御することを特徴とする請求項1または2に記載のオゾン添加制御装置。 - COまたはHCの酸化が生じる前記酸化触媒の温度領域をCO酸化領域とし、COまたはHCによるNO2の還元が生じる前記吸着触媒の温度領域をNO2還元領域とした場合において、
前記制御手段は、取得した前記酸化触媒温度が前記CO酸化領域から外れており、かつ、取得した前記吸着触媒温度が前記NO2還元領域であるといった吸着悪条件を満たす場合に、前記吸着悪条件を満たしていない場合に比べて前記オゾン添加量を増大させることを特徴とする請求項1に記載のオゾン添加制御装置。 - O2によるNOの酸化が生じる前記吸着触媒の温度領域をNO酸化領域とした場合において、
前記制御手段は、取得した前記吸着触媒温度が前記NO酸化領域であるか否かに基づき前記オゾン添加量を制御することを特徴とする請求項1〜4のいずれか1つに記載のオゾン添加制御装置。 - 前記制御手段は、前記吸着触媒へのNO流入量、CO流入量およびHC流入量の少なくとも一つに基づき、前記オゾン添加量を制御することを特徴とする請求項1〜5のいずれか1つに記載のオゾン添加制御装置。
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