A method of controlling a power system including an engine and an exhaust treatment system having an exhaust treatment device is disclosed. The method includes determining a catalyst parameter indicative of a conversion efficiency of the exhaust treatment device. The method further includes determining a weighted index based on the catalyst parameter. The method further includes determining a plurality of first index values. In the method, each first index value of the plurality of first index values is predicted as a function of a corresponding respective aftertreatment control strategy. The method further includes selecting an aftertreatment control strategy based on a comparison between the weighted index and each first index value of the plurality of first index values. In the method, the selected aftertreatment control strategy changes the catalyst parameter. The method also includes operating the exhaust treatment system according to settings corresponding to the selected aftertreatment control strategy.