Diesel engine aftertreatment system

An aftertreatment system for a diesel engine, comprising:

• a housing configured for placement in fluid communication with the diesel engine to receive an exhaust flow therefrom, wherein the housing includes a plurality of tubes mounted within the housing and arranged to define a multi-flow split arrangement to pass the exhaust flow of the diesel engine through the plurality of tubes;
• a plurality of treatment units selectively removable and insertable into the plurality of tubes, wherein each of the plurality of treatment units is configured for treatment of a portion of the exhaust flow, wherein a number of treatment units utilized to treat the exhaust flow within the housing is selectively changeable relative to a number of the plurality of tubes;
• a plurality of sensors configured to measure:
• a NOx concentration and a diesel particulate concentration in the exhaust flow of the aftertreatment system;
• a controller configured to:
• determine a NO2 to NOx ratio and a filtration efficiency based upon data from the plurality of sensors;
• compare the NO2 to NOx ratio and the filtration efficiency to governing regulatory standards;
• and
• recommend via a display at least a desired number of the plurality of treatment units that should be utilized within the plurality of tubes of the housing.

A method of aftertreatment of exhaust from an engine, comprising:

• receiving an exhaust flow from the engine into an apparatus that defines a multi-flow split arrangement;
• passing the exhaust flow in parallel through the multi-flow split arrangement, wherein passing the exhaust flow in parallel through the multi-flow split arrangement includes treating the exhaust flow of less than all of the multi-flow split arrangement to define treated and untreated exhaust flow;
• recombining the treated and untreated exhaust flow within the apparatus;
• and
• passing the recombined exhaust flow from the apparatus;
• wherein treating the exhaust flow of less than all of the multi-flow split arrangement includes varying the number of one or more of a plurality of treatment units from the apparatus based upon determining a NO2 to NOx ratio and a filtration efficiency and comparing the NO2 to NOx ratio and the filtration efficiency to governing regulatory standards.