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Model-based Temperature Control of a Diesel Oxidation Catalyst  

Abstract : The problem studied in this thesis is the control of a DOC (Diesel Oxidation Catalyst) as used in after-treatment systems for exhausts of diesel vehicles. This system is inherently a distributed parameter system due to its elongated geometry where a gas stream is in contact with a distributed catalyst. After having studied this system experimentally, we decided to take into account its distributed nature, which as shown, is also found in other aftertreatment systems (particulate filters, NOx traps, SCR). A first contribution of the thesis is a model, referred to as control model, for the DOC system. It is obtained by successive simplifications justified either experimentally (from observations, estimates of orders of magnitudes) or mathematically (through asymtotic developments, change of variables). This model can account for the complexity of the temperature response of DOC output to changes in input variables. In particular, the effects of inverse responses and delays are well represented. A second contribution is a combination of algorithms (feedback, feedforward, and synchronization) to control the thermal phenomena in the DOC. Both contributions have been tested and validated experimentally. In conclusion, the outcomes are evaluated. In summary, using the approach presented in this manuscript, it is possible to control, in real conditions, the outlet temperature of the DOC within +/- 15°C.
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Submitted on : Tuesday, March 9, 2010 - 8:00:00 AM
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  • HAL Id : pastel-00005857, version 1

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Olivier Lepreux. Model-based Temperature Control of a Diesel Oxidation Catalyst  . Mathematics [math]. École Nationale Supérieure des Mines de Paris, 2009. English. ⟨NNT : 2009ENMP1670⟩. ⟨pastel-00005857⟩

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