| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve treatment performance of rich spike control for reducing and treating NOx deposited in catalyst in an internal combustion engine. <P>SOLUTION: Basic rich spike control time RSNOWTB is calculated in accordance with engine load, and deviation DRSNOWT of rich spike control time RSNOWTnow measured by determining end by an air-fuel ratio detection value on the downstream side of NOx trap catalyst this time and the basic rich spike control time is calculated. A rich level at rich spike control time is learned and changed to maintain constant rich spike control time based on the deviation DRSNOWT. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
