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    • 1. 发明公开
    • Diagnostic method for a post-cat lambda sensor and a catalyst of an exhaust system
    • Diagnoseverfahrenfüreine Vorkatlambdasonde und ein Katalysator eines Abgassystems
    • EP1734242A1
    • 2006-12-20
    • EP05025027.3
    • 2005-11-16
    • Ford Global Technologies, LLC.
    • Karlflo, MatsSvenske, ErikLundén, MarcusCardell, Eric
    • F02D41/14F01N11/00
    • F01N11/00F01N13/009F01N13/0093F02D41/1495Y02T10/47
    • The present invention relates to a method for diagnosing an exhaust aftertreatment system comprising at least one catalyst (4) and a primary lambda probe (3) mounted upstream of the catalyst (4).
      including a diagnosis sequence (500) for simultaneously diagnosing the primary lambda probe (3) and the catalyst (4), said diagnosis sequence (500) comprising
      - controlling (500) the target lambda (air to fuel ratio) upstream of the first catalyst so as to alter between a rich and lean value, respectively, at a target time (t 0 )
      - measuring a primary lambda probe delay time (t delay ) being the time from the target time (t 0 ) to the time (t resp λ 1 ) at which the alteration of the target lambda is detected by the primary lambda probe, and/or
      - measuring a catalyst pulse width time (t pulse width ) being the time from the target time (t 0 ) to the time (t resp λ 2 ) at which the alteration of the target lambda results in an alteration of the lambda detected downstream of the catalyst,
      - evaluating the condition of the primary lambda probe (3) using said delay time (t delay ) and/or
      - evaluating the condition of the catalyst (4) using said catalyst pulse width time (t pulse width ).
    • 本发明涉及一种用于诊断排气后处理系统的方法,其包括安装在催化剂(4)上游的至少一种催化剂(4)和初级λ探针(3)。 包括用于同时诊断原始λ探针(3)和催化剂(4)的诊断序列(500),所述诊断序列(500)包括 - 控制(500)第一催化剂上游的目标λ(空气/燃料比) 以便分别在目标时间(t 0)之间改变富值和稀值之间 - 测量从目标时间(t 0)到时间(t resp)的时间的主λ探针延迟时间(t delay) 1),其中目标λ的改变由主λ探针检测,和/或 - 测量从目标时间(t 0)到时间(t)的时间的催化剂脉冲宽度时间(t脉冲宽度) (2),其中目标λ的改变导致催化剂下游检测到的λ的改变, - 使用所述延迟时间(t延迟)评估主λ探针(3)的状态和/或评估 使用所述催化剂脉冲宽度时间(t脉冲宽度)的催化剂(4)的条件。