A system according to the principles of the present disclosure includes a storage estimation module and an air/fuel ratio control module. The storage estimation module estimates a first amount of ammonia stored in a first selective catalytic reduction (SCR) catalyst and estimates a second amount of ammonia stored in a second SCR catalyst. The air/fuel ratio control module controls an air/fuel ratio of an engine based on the first amount, the second amount, and a temperature of a substrate disposed in the second SCR catalyst.
STATEMENT OF GOVERNMENT RIGHTS
This invention was produced pursuant to United States Government Program No. DE-EE0003379 with the Department of Energy (DoE). The U.S. Government has certain rights in this invention.