×

O2-Sensor fault diagnosis apparatus and method therefor

  • US 20020175086A1
  • Filed: 11/29/2001
  • Published: 11/28/2002
  • Est. Priority Date: 05/22/2001
  • Status: Active Grant
First Claim
Patent Images

1. An O2-sensor fault diagnosis apparatus comprising:

  • an O2-sensor for detecting concentration of oxygen contained in an exhaust gas of an internal combustion engine;

    a feedback control portion for controlling a quantity of fuel supplied to the internal combustion engine through feedback control according to an output signal of the O2-sensor;

    a state judging portion for judging whether the O2-sensor is in an active state or in an inactive state on the basis of an voltage of the output signal of the O2-sensor; and

    a fault diagnosis portion for diagnosing whether the O2-sensor has any fault on the basis of the voltage of the output signal of the O2-sensor under a condition where it is judged that the O2-sensor is in the inactive state.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×