| 摘要 |
A system and method for using feed-back information, such as, for example, system-out NOx levels, to provide for closed-loop selective catalytic reduction control. A reference generation module may adjust an ideal SCR conversion value based on a quantity of reductant slippage from the engine system so as to provide an adjusted ideal SCR conversion efficiency value. The adjusted ideal SCR conversion efficiency value may then be used to generate a reductant to NOx ratio that corresponds to an ideal reductant dosing command. The ideal reductant dosing command may be further adjusted to account for low frequency variations, such as, low frequency variations in the SCR system, to generate an adjusted ideal reductant dosing command. The adjusted ideal reductant dosing command may be further adjusted to reflect high frequency variations in the SCR system, before a final reductant dosing command is generated for a reductant injector. |
