| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately calculate a maximum oxygen storage quantity of a three way catalyst, while restraining the deterioration in emission and drivability. <P>SOLUTION: When calculating the maximum oxygen storage quantity of the three way catalyst provided in an exhaust passage, in an ordinary calculation mode (a selected figure), the air-fuel ratio on the upstream side of the catalyst is swung to lean→rich→lean, and two maximum oxygen storage quantities Cmax2 and Cmax3 are determined, and its average is set as a maximum oxygen storage quantity. In the ordinary calculation mode, after determining the relationship between Cmax2, Cmax 3 and the reference air-fuel ratio by setting the reference air-fuel ratio abyfbasis as a variable, a solution of the reference air-fuel ratio abyfbasis is determined from the relationship of Cmax2 = Cmax 3. In a simple calculation mode, the air-fuel ratio on the upstream side of the catalyst is swung to lean→rich, the maximum oxygen storage quantity Cmax2 is determined, and a maximum oxygen storage quantity is determined from this quantity and a solution of the reference air-fuel ratio abyfbasis. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
