| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a catalyst warming-up control device for promoting the warming-up of a three-way catalyst. <P>SOLUTION: When the warming-up of the three-way catalyst is requested, among a plurality of cylinders 11, an optional cylinder is set to be a lean cylinder #1, and a cylinder other than a lean cylinders #2, #3, and #4 is set to be a rich cylinder #1. The catalyst warming-up control device includes a catalyst warming-up control means for controlling the fuel injection amount of each cylinder in such a manner that fuel is combusted at an air-fuel ratio greater than a theoretical air-fuel ratio at the lean cylinders #2, #3, and #4 and an average of the air-fuel ratios of all the cylinders #1 to #4 becomes equal to the theoretical air-fuel ratio. The number of lean cylinders #2, #3, #4 among the plurality of cylinders is set greater than that of rich cylinders #1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
