A Simulation-Based Approach for Developing Optimal Calibrations for Engines with Variable Valve Actuation

A Simulation-Based Approach for Developing Optimal Calibrations for Engines with Variable Valve Actuation — Variable Valve Actuation (VVA) technology provides high potential for achieving improved performance, fuel economy and pollutant reduction. Benefits of VVA stem from better breathing and the ability to control internal residual. However, additional independent control variables in a VVA engine increase the complexity of the system, and achieving its full benefit depends critically on devising an optimum control strategy. The traditional approach relying on experimentation is in this case prohibitively costly, since the number of tests increases exponentially. Instead, this work formulates the task of defining actuator set-points as an optimization problem. It identifies simulation needs for supporting development of a generic methodology, capable of handling increased number of degrees of freedom. A high-fidelity tool predicts effects of various devices being considered. Since solving Oil & Gas Science and Technology – Rev. IFP, Vol. 62 (2007), No. 4, pp. 539-553 Copyright © 2007, Institut français du pétrole DOI: 10.2516/ogst: 2007047 New Trends on Engine Control, Simulation and Modelling Avancées dans le contrôle et la simulation des systèmes Groupe Moto-Propulseur IFP International Conference Rencontres Scientifiques de l’IFP 06108_O_Wu 13/11/07 15:10 Page 539