| 摘要 |
A method is provided for controlling fluid injected quantity in a NOx reduction system employing a SCR catalyst, and a Diesel Emission Fluid (DEF) injector for feeding the DEF into said SCR catalyst. The method includes, but is not limited to determining, for a given DEF fluid injector, a threshold quantity representative of the fluid injected quantity, the threshold quantity being the minimum injected fluid quantity that provides for a substantially linear behavior of said injector. The method also includes, but is not limited to storing such threshold quantity and determining the quantity of Diesel Emission Fluid (DEF) required by the SCR catalyst. If the quantity of Diesel Emission Fluid (DEF) is above the threshold quantity, then inject the quantity of DEF required into the SCR catalyst, otherwise store the quantity of DEF and after a period, which can be predetermined or random, determine a further quantity of DEF required and sum the quantity of DEF required until the sum of quantities required is above the threshold quantity and, in this case, inject the quantity of DEF required into the SCR catalyst.
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