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    • 6. 发明授权
    • Air-fuel ratio feedback control apparatus
    • 空燃比反馈控制装置
    • US06739122B2
    • 2004-05-25
    • US10196154
    • 2002-07-17
    • Shinichi KitajimaAsao UkaiShigetaka KurodaFutoshi Nishioka
    • Shinichi KitajimaAsao UkaiShigetaka KurodaFutoshi Nishioka
    • F01N300
    • F01N3/0842F01N3/0814F01N11/007F01N2550/03F02D41/1456F02D41/1475F02D2041/1422Y02A50/2324Y02T10/22Y02T10/47
    • The present invention provides an air-fuel ratio feedback control apparatus for an internal-combustion engine. The apparatus includes an air-fuel ratio detector that is disposed in an exhaust system of the engine so as to detect an air-fuel ratio of exhaust gas, NOx purifier for purifying NOx contained in the exhaust gas during a lean operation and feedback controller for making a feedback control upon an air-fuel ratio of air-fuel mixture to be supplied to the engine based on an output of the air-fuel ratio detector. A diagnostic system diagnoses the NOx purifier based on an output of an O2 sensor disposed downstream of the NOx purifier when the air-fuel ratio of the air-fuel mixture to be supplied to the engine has been changed from lean to rich and gain changer for making a feedback control gain of the feedback controller smaller when the air-fuel ratio is changed from lean to rich.
    • 本发明提供一种用于内燃机的空燃比反馈控制装置。 该装置包括:空燃比检测器,其布置在发动机的排气系统中,以便检测废气的空燃比,用于净化排气中的NOx的净化器,用于净化排气中的NOx;以及反馈控制器, 基于空燃比检测器的输出对发动机供给的空气燃料混合物的空燃比进行反馈控制。 当供给到发动机的空气 - 燃料混合物的空燃比已经从稀释变为富和增益变换器时,诊断系统基于设置在NOx净化器下游的O2传感器的输出来诊断NOx净化器, 当空燃比从浓度变为浓时,反馈控制器的反馈控制增益越小。