Abnormality diagnosis system for air-fuel ratio sensor

Abnormality diagnosis system for air-fuel ratio sensor

  • CN 105,593,501 A
  • Filed: 10/01/2013
  • Published: 05/18/2016
  • Est. Priority Date: 10/01/2013
  • Status: Active Application
First Claim
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1. an apparatus for diagnosis of abnormality for air-fuel ratio sensor, possesses:

  • exhaust emission control catalyst, it is establishedBe placed in the exhaust channel of internal combustion engine;

    Upstream side air-fuel ratio sensor, it is than described exhaust gas purification catalysisAgent is arranged at described exhaust channel by the position of flow direction of exhaust gases upstream side;

    Downstream air-fuel ratio sensingDevice, it is described in being arranged at by the position in flow direction of exhaust gases downstream than described exhaust emission control catalystExhaust channel;

    And diagnostic device, downstream is carried out in its output based on these air-fuel ratio sensorsThe abnormity diagnosis of air-fuel ratio sensor, wherein,Described diagnostic device, becomes than reason in the output air-fuel ratio of described upstream side air-fuel ratio sensorDiscuss in the situation of the dense dense air-fuel ratio of air-fuel ratio, in the empty combustion of output of described downstream air-fuel ratio sensorThan rarely sentencing from being varied to than the dense air-fuel ratio of rare determinating reference air-fuel ratio that is leaner than chemically correct fuel than thisWhile determining the air-fuel ratio of benchmark air-fuel ratio, be judged to be described downstream air-fuel ratio sensor and produced extremely.

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