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    • 2. 发明申请
    • CATALYST DEGRADATION DETECTION APPARATUS
    • 催化剂降解检测装置
    • WO2011110912A1
    • 2011-09-15
    • PCT/IB2011000367
    • 2011-02-24
    • TOYOTA MOTOR CO LTDNAKAMURA TAKASHI
    • NAKAMURA TAKASHI
    • F01N11/00F02D41/02
    • F01N11/007F01N2550/02F02D41/0295F02D41/1441F02D41/2454F02D2200/0808F02D2200/0814Y02T10/47
    • A catalyst degradation detection apparatus includes: calculation means for calculating, as an oxygen storage amount of a catalyst (16), an amount of oxygen stored into or desorbed from the catalyst (16) during a period from when a change that corresponds to a change in an air/fuel ratio occurs in the signal of a pre-catalyst sensor (17) to when the signal of a post-catalyst sensor (18) reaches a criterion value regarding the change in the air/fuel ratio; catalyst degradation determination means for determining of degradation of the catalyst (16) on the basis of the oxygen storage amount; and correction means for correcting the oxygen storage amount calculated for use for determining of degradation of the catalyst (16) more to a decrease side as a measured responsiveness of the post-catalyst sensor (18) becomes more deteriorated relative to a reference value.
    • 本发明的催化剂劣化检测装置具备:计算单元,该计算单元将从催化剂(16)的氧吸附量变化为与变化量相对应的变化期间 在催化剂前传感器(17)的信号中发生空气/燃料比时,催化剂后传感器(18)的信号达到与空气/燃料比的变化有关的标准值; 催化剂劣化确定装置,用于基于氧气储存量确定催化剂(16)的劣化; 以及校正装置,用于随着所述催化剂后传感器(18)的所测量的响应性相对于参考值变得更恶化,将计算用于确定所述催化剂(16)的劣化的氧气储存量更多地减小到减少侧。