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ABNORMALITY DIAGNOSIS APPARATUS FOR EXHAUST GAS RECIRCULATION APPARATUS AND ABNORMALITY DIAGNOSIS METHOD FOR EXHAUST GAS RECIRCULATION APPARATUS

  • US 20110011378A1
  • Filed: 03/19/2009
  • Published: 01/20/2011
  • Est. Priority Date: 03/28/2008
  • Status: Abandoned Application
First Claim
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1. An abnormality diagnosis apparatus applied to an exhaust gas recirculation apparatus having an exhaust gas recirculation passage that connects an intake passage and an exhaust passage of an internal combustion engine in order to introduce a part of an exhaust gas into the intake passage and an exhaust gas amount control valve that adjusts an amount of the exhaust gas flowing through the exhaust gas recirculation passage, comprising:

  • an oxygen concentration sensor that is provided in the exhaust passage and outputs a continuous value corresponding to an oxygen concentration of the exhaust gas flowing through the exhaust passage; and

    an EGR abnormality diagnosis unit that performs valve-opening driving on the exhaust gas amount control valve during fuel cut processing for halting a fuel supply of the internal combustion engine wherein at the start of the fuel cut processing, the valve is closed, and when the valve-opening driving is executed on the valve at a predetermined timing, executes abnormality diagnosis processing for determining that an abnormality is present in the exhaust gas recirculation apparatus when a variation range of an output value of the oxygen concentration sensor accompanying the valve-opening driving is smaller than a predetermined value.

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