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US 2014/0278013 A1Published application
Fault diagnostic systems and methods using oxygen sensor impedance
AssigneeGM Global Technology Operations LLC
InventorsBRADLEY C. GIBSON, Eric M. Hall, John W. Siekkinen, Stephen Paul Levijoki
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Abstract
A diagnostic system of a vehicle includes an impedance module and a diagnostic module. The impedance module determines an impedance of a sensing element of an exhaust gas oxygen sensor based on a response of the sensing element to a change in current through the sensing element. The diagnostic module selectively diagnoses a fault associated with the exhaust gas oxygen sensor based on the impedance of the sensing element.
Claims20
A diagnostic system of a vehicle, comprising:
- an impedance module that determines an impedance of a sensing element of an exhaust gas oxygen sensor based on a response of the sensing element to a change in current through the sensing element;
- and
- a diagnostic module that selectively diagnoses a fault associated with the exhaust gas oxygen sensor based on the impedance of the sensing element.
A diagnostic method for a vehicle, comprising:
- determining an impedance of a sensing element of an exhaust gas oxygen sensor based on a response of the sensing element to a change in current through the sensing element;
- and
- selectively diagnosing a fault associated with the exhaust gas oxygen sensor based on the impedance of the sensing element.
Dependencies are inferred from the claim text.