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Control of an SCR catalytic converter system for a mobile heavy-duty application

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3 Author(s)
Schar, C.M. ; Meas. & Control Lab., Zurich, Switzerland ; Onder, C. ; Geering, H.

Selective catalytic reduction (SCR) is well known for exhaust gas aftertreatment in power plant applications. In the near future, it will be introduced in Europe in mobile heavy-duty diesel applications. Stringent specifications and the dynamic operation mode of such applications demand advanced control strategies. Such a control strategy is presented here. It incorporates a model-based feedforward controller (FFC) which handles the known dynamics of the plant. It further contains a feedback controller (FBC) to compensate for disturbances and slowly varying parameters. The realization of the feedback control loop is possible only due to the use of a nitrogen oxide (NOx) sensor which is cross-sensitive against ammonia (NH3), and the implementation of a procedure separating the detection of NOx and NH3.

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:14 ,  Issue: 4 )