| 摘要 |
<P>PROBLEM TO BE SOLVED: To shorten a period of time needed for establishing the state that an air-fuel ratio becomes a value in the vicinity of the theoretical air-fuel ratio, upon starting feedback control or upon sudden change of a correction amount required for feedback control, thereby restraining deterioration in exhaust gas or output characteristics of the engine. <P>SOLUTION: A fuel amount determiner 61 determines an operation state reference coefficient TBASE and an operation state correction coefficient FO2RAM corresponding to the operation state based on a first corresponding relationship 71 and a second corresponding relationship 73 stored preliminarily in a memory 63 and also determines feedback correction coefficients FAF, FRLAF, FLLAF for having the air-fuel ratio closer to the theoretical air-fuel ratio based on the output of an air-fuel ratio sensor 56 for determining a fuel command value using a calculation formula including the determined operation state reference coefficient TBASE, the operation state correction coefficient FO2RAM, and the feedback correction coefficients FAF, FRLAF, FLLAF. <P>COPYRIGHT: (C)2012,JPO&INPIT |
