Accuracy of PSA's DPF soot load estimator calibrated by means of a DoE model
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
The combustion process happening in the Diesel engine is naturally producing soot. These soot emissions have been known for being harmful for both our environment and especially our health. Aware of this situation, the governments worldwide have defined emission limits for our vehicles. These emission regulations are continuously revised and have become harder and harder for the car manufacturers to reach. In that context, PSA has introduced in 2000 the Diesel Particulate Filter in the automotive industry (on a large scale).The DPF technology chosen by PSA requires a constant monitoring of the soot load in the filter. This monitoring is done by a module which estimates in real time the soot amount emitted by the engine and the self-regenerated part at the same time. In order to work properly, this module needs to be previously calibrated on an engine test bench. This solution has shown great results so far but the time needed in the test cell for the calibration is very long.An idea is then to use an engine model obtained by means of a Design of Experiment. This kind of model is able to provide us with data such as fuel consumption or pollutant emissions in a certain range of operating points. Nowadays, DoE engine models are used in the engine tuning phase which occurs before the soot load estimator is calibrated. The available engine model was consequently utilized to simulate the tests originally done in the test cell and results of the simulations used to calibrate the soot load estimator of the DPF. A potential problem of this method was that the engine operating points asked to the model would be close to its border of accuracy or even outside.6The results given by the model have first been compared to those provided by a real engine. Being close enough, data collected by the model have been used to calibrate the soot load estimator. This estimator was finally tested on real driving cycles. The accuracy of its load estimation was compared to the DPF weight (before/after) and promising enough for PSA to keep working in that direction after this thesis.
Place, publisher, year, edition, pages
2013. , 49 p.
, MMK 2013:84 MFM 152
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-145030OAI: oai:DiVA.org:kth-145030DiVA: diva2:715783
Cronhjort, Andreas, Universitetslektor