Abstract: A reductant dosing system for an exhaust aftertreatment system of a diesel engine includes a reductant tank with an inlet volume separated from an outlet volume by a sock filter. A filter permeability condition is detected by the electronic controller using a filter status algorithm that compares fluid level sensor data to expected data. A filter permeability condition might be indicated when the reductant dosing rate exceeds the rate at which fluid can move through the sock filter from the inlet volume to the outlet volume. A filter permeability condition may eventually lead to a system fault.

Abstract: An exhaust aftertreatment system, such as for a diesel engine, includes a reductant dosing system with an injector positioned in an elbow pipe of an exhaust conduit. A tubeless mixer is positioned in the exhaust conduit between the injector nozzle outlet and an SCR catalyst. The tubeless mixer includes a plurality of rings, all of which are distributed with increasing size as distance from the nozzle outlet increases. The tubeless mixer aides in more uniformly distributing reductant in the exhaust flow prior to arrival at the SCR catalyst.