Ford Global Technolgoies, LLC

Paul Raymond Willette

Michael Igor Kluzner

Mario Anthony Santillo

Andrew Paul Bagnasco

Robert Joseph Jerger

Christopher Kirk Davey

David Robert Nader

Methods and systems are provided for enabling diagnostics of an exhaust catalyst regardless of a level of oxygen stored in the catalyst. In one example, a method may include initiating diagnostics of the catalyst in response to an oxygen sensor coupled downstream of the catalyst recording a measurement that crosses a stoichiometric air-fuel ratio output more than a threshold number of times.

Methods and systems for catalyst monitoring enablement

Method and system are provided for monitoring performance of a catalytic converter coupled to an exhaust of an internal combustion engine supplied with fuel from a fuel tank where the fuel can include a first fuel and second fuel in concentrations that vary from one refueling to the next. A ratio indicative of catalytic converter exhaust gas conversion efficiency is determined from signals provided by an exhaust gas sensor disposed upstream and an exhaust gas sensor disposed downstream relative to the catalytic converter, and a ratio threshold value indicative of a malfunctioning catalytic converter is adjusted in dependence on the concentration of one of the first fuel and second fuel in the fuel in the fuel tank.

Method for catalyst monitoring using flex fuel

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Sterling Heights, MI, United States of America

Paul Raymond Willette