×

Abnormality diagnosis system and method for oxygen sensor

  • US 6,711,932 B2
  • Filed: 06/24/2002
  • Issued: 03/30/2004
  • Est. Priority Date: 07/04/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A diagnosis system that determines an abnormality in at least one oxygen sensor, having a detector interposed between a reference gas and an exhaust gas and generating a detection signal in accordance with a difference of an oxygen partial pressure between the reference gas and the exhaust gas, the system comprising:

  • a controller that determines the abnormality of the oxygen sensor owing to a fracture of the detector on the basis of an output pattern of the detection signal of the oxygen sensor, wherein the controller determines whether the detector has the fracture on the basis of a distribution pattern of the detection signal generated by the oxygen sensor.

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