For the simultaneous evaluation of the influence onengine knock of both chemical conditions and globaloperating parameters, a combined tool was developed.Thus, a two-zone kinetic model for SI engine combustioncalculation (Ignition) was implemented in the enginecycle simulation commercial code. The combined modelpredictions are compared with experimental data from asingle-cylinder test engine. This shows that the modelcan accurately predict the knock onset and in-cylinderpressure and temperature for different lambdaconditions, with and without EGR. The influence of nitricoxide amount from residual gas in relation with knock isfurther investigated. The created numerical toolrepresents a useful support for experimentalmeasurements, reducing the number of tests required toassess the proper engine control strategies. This kind ofcombined analysis is not possible yet with othernumerical tools.
Knock modelling: an integrated tool for detailed chemistry and engine cycle simulation / A., Gogan; Montorsi, Luca; F., Mauss; S. S., Sayeed; B. A., Sunden. - STAMPA. - --:(2003), pp. -----. (Intervento presentato al convegno SAE Powertrain & Fluid Systems Conference & Exhibition tenutosi a Pittsburgh, PA, USA nel Ottobre 2003).
Knock modelling: an integrated tool for detailed chemistry and engine cycle simulation
MONTORSI, Luca;
2003
Abstract
For the simultaneous evaluation of the influence onengine knock of both chemical conditions and globaloperating parameters, a combined tool was developed.Thus, a two-zone kinetic model for SI engine combustioncalculation (Ignition) was implemented in the enginecycle simulation commercial code. The combined modelpredictions are compared with experimental data from asingle-cylinder test engine. This shows that the modelcan accurately predict the knock onset and in-cylinderpressure and temperature for different lambdaconditions, with and without EGR. The influence of nitricoxide amount from residual gas in relation with knock isfurther investigated. The created numerical toolrepresents a useful support for experimentalmeasurements, reducing the number of tests required toassess the proper engine control strategies. This kind ofcombined analysis is not possible yet with othernumerical tools.
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