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A reductant injection control strategy for controlling an amount of nitrogen oxide reducing agent injected upstream of a selective reduction catalyst uses an ammonia sensor located downstream of the catalyst. An open loop injection quantity is first determined based on operation conditions. Ammonia

A reductant injection control strategy for controlling an amount of nitrogen oxide reducing agent injected upstream of a selective reduction catalyst uses an ammonia sensor located downstream of the catalyst. An open loop injection quantity is first determined based on operation conditions. Ammonia concentration detected downstream of the catalyst is controlled to a desired value, with the desired value based on catalyst temperature and the open loop injection quantity.

대표청구항 ▼

A reductant injection control strategy for controlling an amount of nitrogen oxide reducing agent injected upstream of a selective reduction catalyst uses an ammonia sensor located downstream of the catalyst. An open loop injection quantity is first determined based on operation conditions. Ammonia

A reductant injection control strategy for controlling an amount of nitrogen oxide reducing agent injected upstream of a selective reduction catalyst uses an ammonia sensor located downstream of the catalyst. An open loop injection quantity is first determined based on operation conditions. Ammonia concentration detected downstream of the catalyst is controlled to a desired value, with the desired value based on catalyst temperature and the open loop injection quantity. movement of the beams. 5. The method defined in claim 4 wherein the path is horizontal. 6. The method defined in claim 4, further comprising the step of determining the position of the package relative to the frame. 7. The method defined in claim 4 wherein the supplies are rolls having center axes, the frame having a support holding the rolls with their axes horizontal, the method further comprising the step of deflecting the foils into a vertical orientation in the curtain. 8. The method defined in claim 4, further comprising the steps of looping the foils between the supplies and the curtain; and continuously pulling the foils from the respective supplies.