COLDSTART ENGINE COMBUSTION MODELLING TO CONTROL HYDROCARBON EMISSIONS

摘要

Due to the large contribution of the coldstart process to unburned hydrocarbon emissions of an internal combustion engine during FTP cycle tests, we take a new look at the production of hydrocarbons inside the combustion chamber during coldstart. To this end a model is developed which predicts the exhaust port hydrocarbon concentration, exhaust gas temperature and equivalence ratio based on a simplified, control-oriented heat release analysis of the cylinder pressure. Non-linear control algorithms are used to regulate the engine to a pre-defined exhaust profile, based on optimized catalyst-out hydrocarbon emissions. This approach is intended to make use of robust, automotive-grade exhaust hydrocarbon sensors currently in development.