Ammonia storage set-point control for selective catalytic reduction applications

摘要

A system includes an injector control module and an SCR optimization module. The injector control module controls an amount of ammonia (NH3) stored in a selective catalytic reduction (SCR) catalyst to maintain a first storage level. The SCR optimization module determines whether the first storage level maximizes a conversion efficiency of the SCR catalyst at a first temperature and minimizes a probability of NH3 slip when the temperature of the SCR catalyst transitions from the first temperature to a second temperature. The injector control module controls the amount of NH3 stored in the SCR catalyst to maintain a second storage level when the second storage level maximizes the efficiency of the SCR catalyst relative to the first storage level and minimizes the probability of NH3 slip relative to the first storage level.

主权项

1. A system comprising:
an injector control module that controls an amount of ammonia (NH3) stored in a selective catalytic reduction (SCR) catalyst to maintain a first storage level; and an SCR optimization module that predicts whether a second storage level maximizes a conversion efficiency of the SCR catalyst and minimizes a probability of NH3 slip when the temperature of the SCR catalyst transitions from a current temperature to a potential temperature, wherein the injector control module increases an amount of reducing agent injected into exhaust gas to adjust the amount of NH3 stored in the SCR catalyst from the first storage level to the second storage level at a current time when the second storage level is predicted to maximize the efficiency of the SCR catalyst relative to the first storage level and minimize the probability of NH3 slip relative to the first storage level at a future time when the SCR catalyst is at the potential temperature.