Patent ID: 6701903
Filing Date: 2004-03-09
Classification: F02D,F02M,Y02T

Abstract:
A method for determining valve timing events to optimize operating parameters of an engine having a variable valve timing system over an entire operating range of the engine, the method comprising the steps of:(A) setting combinations of intake valve opening and closing timing events and exhaust valve opening and closing timing events for a given engine speed; (B) for each combination, obtaining a fuel conversion efficiency measure and an emissions measure of the engine at the given engine speed; (C) selecting combinations which optimize a weighted cost function of the fuel conversion efficiency measure and the emission measure for a range of engine output torque settings at the given engine speed; (D) repeating steps A, B, and C for each given engine speed across a range of engine speeds; and (E) assembling a feed-forward map based on the selected combinations for the entire operating range of the engine.