Apparatus, system, and method for NOx signal correction in feedback controls of an SCR system

摘要

For example, according to one representative embodiment, an apparatus for reducing NOx emissions in an engine exhaust includes a NOx reduction target module configured to determine a NOx reduction requirement. The apparatus also includes a tailpipe NOx module configured to determine a sensed amount of NOx exiting the engine system and a signal correction algorithm module configured to determine a corrected amount of NOx exiting the engine system based at least partially on the sensed amount of NOx exiting the engine system. The apparatus also includes a feedback ammonia target module configured to determine a feedback ammonia addition requirement. The feedback ammonia addition requirement includes an amount of ammonia added to the exhaust gas stream to achieve the NOx reduction requirement in response to the corrected amount of NOx exiting the engine system. The apparatus also includes a reductant target module that is configured to determine a reductant injection requirement.