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    • 5. 发明授权
    • Exhaust gas purification device for an internal combustion engine
    • 内燃机用废气净化装置
    • US06336320B1
    • 2002-01-08
    • US09345406
    • 1999-07-01
    • Hiroshi TanakaToshio TanahashiNaoto Suzuki
    • Hiroshi TanakaToshio TanahashiNaoto Suzuki
    • F01N300
    • F01N3/0842F01N3/0814F01N9/00F01N13/009F01N13/011F01N2250/12F01N2570/16F02D41/0275F02D41/1462F02D41/1465F02D41/3011F02D41/3029F02D41/402F02D41/405F02D2200/0806F02D2200/0814F02D2200/0818Y02T10/44Y02T10/47
    • Start catalysts (SCs) having an O2 storage function are disposed in an exhaust gas passage of an internal combustion engine, and an NOx occluding and reducing catalyst is disposed in the exhaust gas passages downstream of the SCs. NOx in the exhaust gas is absorbed by the NOx occluding and reducing catalyst when the engine is in operation at a lean air-fuel ratio. When NOx is to be released, the engine is operated at a rich air-fuel ratio so that exhaust gas having a rich air-fuel ratio flows into the SCs and into the NOx occluding and reducing catalyst. An electronic control unit (ECU) executes the secondary fuel injection that does not contribute to the combustion in the expansion stroke or in the exhaust stroke of each cylinder by using a direct cylinder fuel injection valve at the time when the engine operating air-fuel ratio is to be changed from a lean air-fuel ratio operation to a rich air-fuel ratio, so that exhaust gas having a rich air-fuel ratio flows into the SC and that oxygen stored in the SC is released. At the time of changing over the air-fuel ratio, therefore, the air-fuel ratio is changed from the lean side to the rich side without delay, eliminating such an occurrence that NOx is released from the NOx occluding and reducing catalyst without being purified at the time of changing the air-fuel ratio.
    • 具有O 2储存功能的起始催化剂(SC)被设置在内燃机的排气通道中,并且NOx吸留还原催化剂设置在SC的下游的排气通道中。 当发动机以稀薄的空燃比运转时,废气中的NOx被NOx吸留和还原催化剂吸收。 当要释放NOx时,发动机以丰富的空燃比运转,使得具有浓空燃比的废气流入SC并进入NOx吸留和还原催化剂。 电子控制单元(ECU)通过在发动机工作空燃比(ECU)中使用直接气缸燃料喷射阀来执行对膨胀行程或每个气缸的排气冲程中的燃烧无贡献的二次燃料喷射 从稀空燃比操作变为浓空燃比,使得具有浓空燃比的废气流入SC,并且释放存储在SC中的氧。 因此,在空燃比变化的时候,空燃比从稀侧变为富侧无效,消除了NOx从NO X吸留还原催化剂释放而不被净化的情况 在改变空燃比的时候。
    • 8. 发明授权
    • Exhaust gas purification device for an internal combustion engine
    • 内燃机用废气净化装置
    • US06499294B1
    • 2002-12-31
    • US09399287
    • 1999-09-17
    • Kenji KatohTakaaki ItouHiroshi TanakaShuichi KuboYoshiyuki MandokoroMasahiro Taki
    • Kenji KatohTakaaki ItouHiroshi TanakaShuichi KuboYoshiyuki MandokoroMasahiro Taki
    • F01N310
    • F01N3/0864B01D53/9431B01D53/9495F01N3/0814F01N3/0842F01N3/0871F01N13/009F01N13/0097F01N13/011F01N2250/12F01N2510/00F01N2510/06F01N2570/16F02D41/0275Y02T10/22Y02T10/24
    • A converter containing a NOx absorbing and reducing catalyst is disposed in the exhaust passage of an internal combustion engine. The upstream half portion (portion of the inlet side) of the substrate of the NOx absorbing and reducing catalyst in the converter carries the oxygen storage component that absorbs oxygen in the exhaust gas when the air-fuel ratio of the exhaust gas is lean and releases the absorbed oxygen when the air-fuel ratio of the exhaust gas flowing in is rich in addition to carrying the NOx absorbing and reducing catalyst. After NOx is absorbed by the NOx absorbing and reducing catalyst as a result of operating the engine at a lean air-fuel ratio, the engine is operated at a rich air-fuel ratio, so that NOx is released from the NOx absorbing and reducing catalyst and is purified by reduction. Here, oxygen is released from the oxygen storage component carried by the upstream half portion of the substrate and is reacted with the H2 and CO components in the exhaust gas, so that the temperature of the NOx absorbing and reducing catalyst is raised within short periods of time due to the heat of reaction. Therefore, the catalyst exhibits increased activity and the NOx absorbing and reducing catalyst exhibits improved NOx purification capability.
    • 含有NOx吸收和还原催化剂的转化器设置在内燃机的排气通道中。 转换器中的NOx吸收还原催化剂的基板的上游半部(入口侧的部分)在废气的空燃比稀的时候携带吸收废气中的氧的储氧成分,释放 除了携带NOx吸收还原催化剂之外,当排出的废气的空燃比富含时,吸收的氧也富含。 由于作为发动机以稀薄的空燃比运转,NO x吸收还原催化剂吸收了NOx之后,发动机的空燃比浓度较高,使NO x从NOx吸收还原催化剂 并通过还原进行纯化。 这里,从由基板的上游半部分承载的储氧成分中释放出氧,并与废气中的H 2和CO成分反应,使NOx吸收还原催化剂的温度在短时间内升高 时间由于反应的热量。 因此,催化剂表现出增加的活性,NOx吸收和还原催化剂表现出提高的NOx净化能力。