Ford Global Technolgoies, LLC

Robert Sarow Baskins

Chris Paul Glugla

Michael John Cullen

Rani Kiwan

Christopher Kirk Davey

David Robert Nader

Ziad Zaghati

Methods and systems are provided for detection of cylinder misfire in an engine. In one example, a system may comprise a first cylinder and second cylinder of the engine having exhaust flows combined together in an exhaust system before being combined with other cylinders of the engine. The first cylinder and second cylinder may share an exhaust gas sensor mounted in the exhaust in a position to sense exhaust from the first cylinder and second cylinder, and being positioned before exhaust from other cylinders is combined with sensed exhaust from the first cylinder and second cylinder. The system may further include a control system with instructions stored therein to indicate detected misfire in one or more of the first and second sensors based on an output from the exhaust gas sensor.

Systems and methods for cylinder misfire detection

A method and system for estimating the midbed temperature of a catalytic converter in an exhaust system of an internal combustion engine. A rate of change in the speed of the engine is sensed and an estimated number of misfires occurring in the engine over a predetermined number of cylinder filling events is determined based on the sensed rate of change in engine speed. An instantaneous temperature of exhaust gas at the exhaust flange is determined based on the estimated rate of misfires. An instantaneous temperature at the midbed point of the catalytic converter is then determined based on the instantaneous temperature of exhaust gas at the exhaust flange. The instantaneous temperature at the midbed point is compared to a predetermined temperature threshold and the estimate rate of misfires is compared to a predetermined misfire rate threshold. A malfunction signal is then generated if both the instantaneous temperature at the midbed point exceeds the predetermined temperature threshold and the estimated rate of misfires exceeds the predetermined misfire rate threshold. A method for monitoring catalyst degradation is also disclosed.

Method and system for estimating a midbed temperature of a catalytic

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Chelsea, MI, United States of America

Robert Sarow Baskins