Author(s):
1. Slobodan Popovic, Univeristy of Belgrade, Faculty of Mechanical Engineering, Serbia
2. Nenad Miljić, Univeristy of Belgrade, Faculty of Mechanical Engineering, Serbia
3. Marko Kitanović, Univeristy of Belgrade, Faculty of Mechanical Engineering, Serbia
4. Predrag Mrdja, Mašinski fakultet Univerziteta u Beogradu, Serbia
5. Miroljub Tomić, Univeristy of Belgrade, Faculty of Mechanical Engineering, Serbia

Abstract:
A non-linear, angle-resolved, multi-cylinder SI engine computational model has been developed for predictions of instantaneous crankshaft speed and torque. The computation is firmly based on high-fidelity, comprehensive thermodynamic, steady-state, Two-Zone, Zero-Dimensional combustion model followed by a detailed analytical component model of engine friction and mechanical losses. Predictions of both engine cranking and steady-state operation conditions reveal strong dependence of variable engine moment of inertia and crankshaft instantaneous speed signal. The uncertainties and variation in the masses of the reciprocating slider mechanism components are further analysed in order to establish the impact on the instantaneous torque and speed profile. Self-tuning concept based on Levenberg-Marquardt Box-Constrained Optimisation algorithm has been introduced for model parameter identification.

Key words:
spark ignition engine,two-zone model,mechanical losses,instantaneous crankshaft speed,optimisation

Date of abstract submission:
29.03.2013.

Conference:
DEMI 2013

Applied paper from author