| 摘要 |
A system for cleansing the gaseous emission stream generated by the combustion of an A/F mixture within cylinders of an internal combustion engine, the system comprising, a low mass, three-way filter catalyst (20) stationed close to the source of said stream effective to filter out random combustion effects within said stream, a high mass, three-way main catalyst (22) stationed downstream of said filter catalyst effective to convert the remainder of noxious emissions in said stream to desired levels, a continuous universal exhaust gas oxygen sensor (21) stationed in said stream between said catalysts effective to rapidly and accurately indicate the level of oxygen within the stream leaving the filter catalyst, and proportional control means (23) for adjusting in closed loop the A/F ratio of said mixture in interactive response to a deviation of the sensed oxygen level from a target level. |
