Method of estimating the fuel/air ratio of an internal combustion engine

摘要

A method of estimating the fuel/air ratio of the mixture supplied to an engine is described in which the in-cylinder pressure signal in a combustion cycle is processed to obtain an estimate of the fresh mixture strength supplied to the cylinder. The estimation is obtained by calculating the trapped charge mass and the total fuel mass consumed in a combustion cycle. Based on these values, the fuel/air ratio is estimated.