International Engine Intellectual Property Company, LLC

Edward M Derybowski

Brad J Adelman

Shyam Santhanam

Michael James Miller

Vadim Olegovich Strots

An exhaust after-treatment system is described. Generally speaking, the system includes separate primary and secondary NOreducing systems for delivering reductant (e.g. urea and ammonia) to an exhaust stream, a sensor system for determining relevant operating conditions and an electronic control module for activating the reducing systems. The two NOreducing systems include flow control modules coupled to the electronic control module. Methods for reducing NOin an exhaust stream are also described. Generally speaking, the methods include the steps of determining a need for NOreduction in an exhaust stream, determining temperature of exhaust stream, and injecting at least one of a primary reductant and a secondary reductant into the exhaust stream based on the determined temperature of the exhaust stream. Typically, the primary reductant comprises urea and the secondary reductant comprises ammonia.

Supplemental ammonia storage and delivery system

A blow-by treatment assembly () for a vehicle having an engine () emitting blow-by gas () includes a duct () for receiving blow-by gas from the engine. A catalyst trap () is disposed in fluid communication with the duct (). The catalyst trap () removes hydrocarbon emissions from the blow-by gas (). A pump () pumps the blow-by gas () through the catalyst trap (). An outlet () is in fluid communication with the catalyst trap () for emitting the blow-by gas to either the ambient or to a tailpipe.

Crankcase blow-by gas treatment assembly and method of treating blow-by gas

A method () for injecting ammonia (NH) into exhaust gas upstream of a catalyst of an aftertreatment system includes the steps of determining whether a regeneration event is imminent () on the basis of predetermined parameters, and determining whether dosing parameters are met (). The method () further includes the steps of calculating an amount of NHto fill the catalyst () and adjusting a quantity of NHdosed () before the regeneration event occurs.

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Hanover Park, IL, United States of America

Edward M Derybowski