Hybrid electric vehicles offer the possibility of driving electrically with the combustion engine shut off. However, this leads to cooling of the catalyst, which may significantly worsen the vehicle emissions. In this contribution, first a vehicle model including thermal models of the exhaust gas aftertreatment is introduced. Based on a reference battery state of charge trajectory for the predicted trip, a fuel optimal online optimization by means of Pontryagin's Minimum Principle is introduced. It is then extended by further optimization criteria, including the catalyst temperature. Simulations of the New European Driving Cycle show that purely fuel optimal operation leads to a catalyst temperature which is too low for effectively reducing the emissions. The optimization which includes the catalyst temperature is able to keep the catalyst in an operating state with only small effects on the overall fuel consumption.
Emission optimized hybrid vehicle operation with thermal exhaust model
2013
15 Seiten, Bilder, Tabellen, Quellen
Aufsatz (Konferenz)
Englisch
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