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Combustible-gas sensor, diagnostic device for intake-oxygen concentration sensor, and air-fuel ratio control device for internal combustion engines

  • US 20020139360A1
  • Filed: 03/05/2002
  • Published: 10/03/2002
  • Est. Priority Date: 03/05/2001
  • Status: Active Grant
First Claim
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1. An air-fuel ratio control device for internal combustion engines, comprising:

  • an evaporative fuel concentration sensor that is disposed in an intake passage of an internal combustion engine so as to detect a concentration of evaporative fuel contained in intake gas;

    a purging device that supplies evaporative fuel in a fuel tank to the intake passage upstream of the evaporative fuel concentration sensor;

    a vapor amount calculation portion that calculates an amount of the evaporative fuel contained in intake gas on the basis of a value detected by the evaporative fuel concentration sensor;

    an intake-side purge control portion that performs intake-side purge control so as to correct a fuel supply amount of the engine on the basis of a value detected by the evaporative fuel concentration sensor while supplying the intake passage with evaporative fuel;

    an anomalous output detection portion that detects an anomaly in engine output on the basis of a parameter regarding engine output;

    a determination portion that determines whether or not the anomaly in engine output detected during the performance of the intake-side purge control has occurred as a result of the intake-side purge control; and

    a sensor anomaly determination portion that determines that there is an anomaly in the evaporative fuel concentration sensor if it is determined that the anomaly in engine output has occurred as a result of the intake-side purge control.

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