| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To appropriately diagnose the degree of deterioration of an NOx trap catalyst. <P>SOLUTION: In a rich spike operation, when an output value VO2<SB>F</SB>at an inlet O2 sensor reaches a predetermined value VO2<SB>F</SB>, and an output value VO2<SB>R</SB>at an outlet O2 sensor is lower than the output value VO2<SB>F</SB>of the inlet 02 sensor, a difference VOBD<SB>02</SB>between the output value V02<SB>F</SB>at the inlet 02 sensor and the output value VO2<SB>R</SB>at the output O2 sensor is calculated. The deterioration of the NOx trap catalyst is diagnosed based on the difference VOBD<SB>O2</SB>. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
