Title: Valve event optimization in a spark-ignition engine

Authors: D.N. Assanis, M. Polishak

Addresses: Automotive Systems Laboratory, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. ' Automotive Systems Laboratory, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

Abstract: A computer simulation has been developed to study the effects of valve event parameters (lift, duration, and phasing) on spark-ignition engine performance. The zero-dimensional model employs polynomial and dynamic techniques to generate cam profiles for valve event optimisation. The model was calibrated and validated against data from a General Motors 2.5 litre engine. The simulation was then used to determine optimum valve events under different engine conditions. This insight was used to improve the cam design. Subsequent engine testing confirmed that a 3 per cent improvement in peak torque could be obtained with the optimised cam.

Keywords: cam design; engine simulation; pumping losses; valve event optimisation; volumetric efficiency; spark-ignition engines; SI engines; vehicle design.

DOI: 10.1504/IJVD.1989.061554

International Journal of Vehicle Design, 1989 Vol.10 No.6, pp.625 - 638

Published online: 26 May 2014 *

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