Ford Global Technolgoies, LLC

Chris Riffle

Michiel Jacques Van Nieuwstadt

Frank M Korpics

Devesh Upadhyay

Jeff Reich

Peter Mitchell Lyon

John Paul Bogema

David Robert Nader

Dean Pennala

Various systems and methods are described for detecting ammonia slip. In one example method, an exhaust system with two NOx sensors uses transient responses of the NOx sensors to allocate tailpipe NOx sensor output to NOx and NHlevels therein. An ammonia slip detection counter with gains is included that determines a probability of NOx and NHbased on the measured sensor activities that are further processed by a controller to adjust one or more parameters based on the allocation and changes of sensor output.

Enhanced real-time ammonia slip detection

A method for controlling combustion in an engine is provided. The method comprises under a first condition, adjusting an EGR amount of a total cylinder charge in response to engine out NOx levels being below a first threshold. In this way, NOx levels may be used as feedback to control combustion stability.

NOx feedback for combustion control

Various systems and methods are described for detecting ammonia slip. In one example method, an amount of exhaust gas recirculation is reduced when output from an exhaust gas sensor indicates an increase in nitrogen oxide above a threshold amount. When the sensor output increases above a second threshold while the exhaust gas recirculation is reduced, the sensor output is allocated to nitrogen oxide; and when the sensor output does not increase above a second threshold while the exhaust gas recirculation is reduced, the sensor output is allocated to ammonia.

Methods and systems for ammonia slip detection

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Brighton, MI, United States of America

Chris Riffle