Model-based Temperature Control of a Diesel Oxidation Catalyst

The problem studied in this book is the control of a DOC (Diesel Oxidation Catalyst) as used in aftertreatment systems 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. A first contribution of the book is a model for the DOC system. It is obtained by successive simplifications justified either experimentally (from observations, estimates of orders of magnitudes) or by an analysis of governing equations (through asymptotic developments, change of variables). 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. Using the approach presented, it is possible to control, in real conditions, the outlet temperature of the DOC within +/-15K. This book is of particular interest for automotive practitioners who have to develop simple and efficient control algorithms. Academics and students will find an interesting application of control of distributed parameter systems.