Ford Global Technolgoies, LLC

Marcus Timothy Davies

Frederik De Smet

Patrick Phlips

Kim Ford

Jon Edward Caine

The subject matter of the disclosure relates to a method of diagnosing NOx storage catalyst during the operation of a motor vehicle. The method uses two diagnosis sub-methods having various sensitivities with respect to sulfur contamination of the NOx storage catalyst. The results of the two sub-methods are used to ascertain proportions of aging of the NOx storage catalyst resulting from thermal aging and sulfur contamination.

Method of monitoring an exhaust gas aftertreatment system

A multi-cylinder internal combustion engine having an exhaust system with an exhaust emission after-treatment device for exhaust gases from the cylinders, an air supply system for supplying fresh air to the cylinders, a fuel supply system for supplying fuel to each cylinder, and a controller to cut off the fuel supply and disable at least one cylinder, and preferably two cylinders in opposing pairs. A valve assembly is located between the cylinders to be disabled and the emission after-treatment device and is operable to divert gases from said the disabled cylinders via a recirculation conduit back to the air supply system.

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Rochester, United Kingdom

Marcus Timothy Davies