IDENTIFYING AMMONIA NON-SLIP CONDITIONS IN A SELECTIVE CATLYTIC REDUCTION APPLICATION

摘要

A system includes a sampling module, a correlation determination module, and an injector control module. The sampling module samples first and second signals that indicate an amount of nitrogen oxides (NOx) upstream and downstream from a selective catalytic reduction (SCR) catalyst, respectively. The second signal further indicates an amount of ammonia downstream from the SCR catalyst when ammonia is released from the SCR catalyst. The correlation determination module determines an amount of correlation between the first and second signals, wherein the amount of correlation indicates a probability that ammonia is released from the SCR catalyst. The injector control module controls an amount of reducing agent injected into the exhaust gas upstream from the SCR catalyst based on the amount of correlation.