초록 ▼

A diesel powered vehicle is provided with an SCR system which uses an external reducing reagent to convert NOx emissions in a manner which accounts for the effects of NOx transient emissions on the reducing catalyst. Actual NOx emissions produced by the engine are filtered using a variable NOx time

A diesel powered vehicle is provided with an SCR system which uses an external reducing reagent to convert NOx emissions in a manner which accounts for the effects of NOx transient emissions on the reducing catalyst. Actual NOx emissions produced by the engine are filtered using a variable NOx time constant in turn correlated to the reductant/NOx storage capacity of the reducing catalyst at its current temperature to account for changes in the SCR system attributed to NOx transient emissions. Catalyst temperature is filtered using a variable catalyst time constant corresponding to current space velocity of the exhaust gas to account for changes in the catalyst temperature attributed to NOx transient emissions. The reductant is metered on the basis of the filtered, corrected NOx concentration applied at a NSR ratio based, in turn, on the filtered, corrected reducing catalyst temperature.

대표청구항 ▼

A diesel powered vehicle is provided with an SCR system which uses an external reducing reagent to convert NOx emissions in a manner which accounts for the effects of NOx transient emissions on the reducing catalyst. Actual NOx emissions produced by the engine are filtered using a variable NOx time

A diesel powered vehicle is provided with an SCR system which uses an external reducing reagent to convert NOx emissions in a manner which accounts for the effects of NOx transient emissions on the reducing catalyst. Actual NOx emissions produced by the engine are filtered using a variable NOx time constant in turn correlated to the reductant/NOx storage capacity of the reducing catalyst at its current temperature to account for changes in the SCR system attributed to NOx transient emissions. Catalyst temperature is filtered using a variable catalyst time constant corresponding to current space velocity of the exhaust gas to account for changes in the catalyst temperature attributed to NOx transient emissions. The reductant is metered on the basis of the filtered, corrected NOx concentration applied at a NSR ratio based, in turn, on the filtered, corrected reducing catalyst temperature. mit logic for transmitting said serial data stream over said serial data channel; and receive logic for receiving said serial data stream transmitted over said serial data channel; de-interleave logic for de-interleaving said serial data stream to reproduce said plurality of data units. 21. The apparatus of claim 20 wherein said interleave logic includes m cascaded registers, said m cascaded registers including a receive register for receiving said plurality of data words and m-1 additional cascaded registers, said interleave logic further including an output register, said m cascaded registers and said output register having inputs and outputs, said inputs of said m-1 cascaded registers being coupled to at least selected outputs of a preceeding cascaded register such that said m-1 additional cascaded registers each produce at their respective outputs time delayed bits from the preceeding cascaded register, selected outputs of said cascaded registers being coupled to selected inputs of said output register, said apparatus further including a serializer for serializing data appearing at the outputs of said output register to produce said serial data stream; and selected outputs of said casc