The development of mathematical models for the design of control strategies for spark ignition automotive engines is described. The objective of the models, used for both simulation and optimization analysis, is the prediction of the effects of control strategies on fuel consumption and emissions of a vehicle over arbitrary driving cycles. In order to achieve the best compromise between precision, experimental costs, computational time and flexibility, a mixed modelling approach is used, with phenomenological and input-output models integrated within a hierarchical system. Mean value models have been used to describe the most significant dynamic effects: (i) air flow, (ii) two phases fuel flow in the intake manifold, and (iii) thermal flow in the cylinder walls. Stochastic effects due to sensors and actuators can be also predicted. Two-zone and multizone thermodynamic models for the prediction of pressure cycle sub-models for engine emissions (HC, CO, and NOx) and mechanical losses have been developed. Experimental design techniques are also under development to optimize the interactions between experimental analysis and models. Most of the models have been integrated in a computer code, used by a major automotive supplier.
Development and validation of hierarchical models for the design of engine control strategies
Entwicklung und Gültigkeitserklärung hierarchischer Modelle zum Entwurf von Regelstrategien für Kfz-Motore
1997
12 Seiten, 6 Bilder, 1 Tabelle, 36 Quellen
Aufsatz (Konferenz)
Englisch
mathematisches Modell , Steuerungs- und Regelungssystem , Verbrennungsmotor , Zündung , Kraftfahrzeug , Kraftstoffverbrauch , Simulationsprogramm , Software , Schadstoffemission , Kostenersparnis , Rechenzeit , Näherungsverfahren , dynamisches Verhalten , Luftströmung , Kraftstoff-Luft-Gemisch , Einlaufströmung , Wärmestrom , Zylinder (Motor) , Leistungsverlust , Vergleichsmessung
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