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    • 6. 发明申请
    • CATALYST DETERIORATION DETERMINATION SYSTEM
    • 催化剂测定系统
    • US20150152769A1
    • 2015-06-04
    • US14404340
    • 2012-05-28
    • Keiichiro AokiKoichi KitauraGo Hayashita
    • Keiichiro AokiKoichi KitauraGo Hayashita
    • F01N11/00G01M15/10
    • F01N11/007F01N2550/02F01N2560/025F02D41/0235F02D41/1441F02D41/1454F02D41/1456F02D2200/0816G01M15/104Y02T10/47
    • A catalyst deterioration determination system for determining deterioration of an exhaust gas purification catalyst having a capability of storing oxygen determines deterioration of the exhaust gas purification catalyst on the basis of its oxygen storage capacity. The system includes an oxygen concentration sensor provided downstream of the catalyst and having characteristics by which as rich gas components in exhaust gas increase, the oxygen concentration sensor outputs a measurement value of the oxygen concentration corresponding to a richer air-fuel ratio. When determining deterioration, the system performs a rich shift mode in which the exhaust gas air-fuel ratio is shifted from a lean air-fuel ratio to a rich air-fuel ratio and a lean shift mode in which the exhaust gas air-fuel ratio is shifted from a rich air-fuel ratio to a lean air-fuel ratio by exhaust gas air-fuel ratio control means, based on the measurement value of the oxygen concentration sensor. The rate of change of the exhaust gas air-fuel ratio in at least the lean shift mode among the rich shift mode and the lean shift mode is limited to a predetermined rate of change or lower, and the rate of change of the exhaust gas air-fuel ratio in the rich shift mode is set higher than the rate of change of the exhaust gas air furl ratio in the lean shift mode.
    • 用于确定具有存储氧气的废气净化催化剂的劣化的催化剂劣化确定系统基于其储氧能力来确定废气净化催化剂的劣化。 该系统包括设置在催化剂下游的氧浓度传感器,其特征在于,随着废气中富含气体成分的增加,氧浓度传感器输出对应于较浓空燃比的氧浓度的测量值。 当确定劣化时,系统执行富排气模式,其中废气空燃比从稀空燃比转变为浓空气燃料比和贫排气模式,其中排气空燃比 基于氧浓度传感器的测量值,通过废气空燃比控制装置从浓空燃比转变为稀空燃比。 在富变换模式和稀班模式之间的至少贫偏模式中的排气空燃比的变化率被限制在预定变化率或更低的变化率,并且排气空气的变化率 富排气模式中的燃料比设定为高于贫排气模式中的废气空气流量比的变化率。