| 摘要 |
PROBLEM TO BE SOLVED: To improve exhaust emission control performance and fuel economy, by maximally quickening the air-fuel ratio feedback control starting timing, while securing stable operability after starting, even if fuel properties change. SOLUTION: While gradually reducing a rich quantity of a target air-fuel ratio correction factor TFBYA after starting, after determining O2 sensor activity, after substituting the rich quantity with an air-fuel ratio feedback correction factor ALPHA as an increase quantity, when a rich degree changing speed of O2 sensor output is small, an integral quantity is increased, and a reducing speed (a reducing speed of a fuel injection quantity increase quantity) of the ALPHA is increased, and as the rich degree changing speed increases, after the integral quantity is reduced and smoothly and stoichiometrically converged, ordinary air-fuel ratio feedback control is started. COPYRIGHT: (C)2006,JPO&NCIPI
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