Systems and methods for implementing corrections to a reductant delivery system in an exhaust aftertreatment system of an internal combustion engine

Disclosed is a reductant delivery system 102 controller for an exhaust aftertreatment system 100 that includes a first sensor 111 coupled to an exhaust conduit system upstream of a catalyst 110, a second sensor 112 coupled to the exhaust conduit system downstream of the catalyst, a reductant pump 120, and a dosing module 114 fluidly coupled to the reductant pump. The reductant delivery system controller is configured to: receive and store a current first measurement from the first sensor; receive and store a current second measurement from the second sensor; cause the reductant pump to draw reductant at a first rate; cause the dosing module to provide a first amount of the reductant; determine a current conversion efficiency based on the current first measurement and the current second measurement; store the current conversion efficiency; determine a current low conversion efficiency time based on the current conversion efficiency; determine a current bias index based on the current low conversion efficiency time; compare the current bias index to a bias index threshold; and adjust at least one of the first rate or the first amount when the current bias index is greater than the bias index threshold.