Back to results
US 8,939,010 B2Granted
System and method for diagnosing faults in an oxygen sensor
AssigneeGM Global Technology Operations LLC
InventorsStephen Paul Levijoki, Thomas J. Majcher, John W. Siekkinen, Michael John Dokter, Scott Jeffrey
Life of this patent
Estimating the term…
Abstract
A system according to the principles of the present disclosure includes an error period module and a sensor diagnostic module. The error period module determines an error period based on an amount of time that a first air/fuel ratio and a desired air/fuel ratio are different. A first oxygen sensor generates a first signal indicating the first air/fuel ratio. The sensor diagnostic module diagnoses a fault in the first oxygen sensor when the error period is greater than a predetermined period.
Claims20
A system comprising:
- an error period module that determines an error period based on an amount of time that a first air/fuel ratio and a desired air/fuel ratio are different and independent of whether the desired air/fuel ratio is changed, wherein a first oxygen sensor generates a first signal indicating the first air/fuel ratio;
- and
- a sensor diagnostic module that diagnoses a fault in the first oxygen sensor when the error period is greater than a predetermined period.
A method comprising:
- determining an error period based on an amount of time that a first air/fuel ratio and a desired air/fuel ratio are different and independent of whether the desired air/fuel ratio is changed, wherein a first oxygen sensor generates a first signal indicating the first air/fuel ratio;
- and
- diagnosing a fault in the first oxygen sensor when the error period is greater than a predetermined period.
Dependencies are inferred from the claim text.