SCR Technology. The application of SCR to diesel vehicles requires that a number of components be utilized. These include a reductant storage system, reductant delivery system, SCR converter, and an integrated control system capable of detecting or predicting the NOx content of the engine exhaust and controlling the reductant injection rate appropriately. Current technology generally utilizes “maps” of NOx emissions as a function of engine operation to predict the required reductant injection rates. This map is known to be a complex response surface that must be evaluated over a wide range of engine operating conditions if the engine is to be used over a range of conditions. Lower NOx conversion occurs if the reductant rate is low, and ammonia slip can increase when it is high.
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Sources: Cooperative Agreement, Cooperative Agreement