目前，解决汽车尾气污染的常用方法之一是机外净化法。
At present, one of methods that solves the pollution commonly used is purification outside the engine.
本文在最后总结了非道路用发动机尾气排放机外净化的特点。
Finally, the article summarized the features of the outer purifiers used to clean the exhaust emissions of the off-road engines.
本文对摩托车排气污染物的形成、影响因素进行了分析，并指出了机内与机外净化措施。
This paper analyses the forming and effects of motorcycle. exhaust emissions, and points out the purifying approach of both in-engine and out-engine parts.
机外净化是指在汽车排气管上安装三效催化转化器，使尾气中的有害成分迅速转化为无害物质。
It refers to install the three way catalytic converter at the automobile exhaust pipe, and rapidly transform the harmful ingredients into innoxious substance.
在发动机试验台架上，选择了两种DOC型尾气净化器，进行了排放比对试验，验证了机外净化的效果。
On an engine test bed, two selected exhaust purifiers with DOC type experienced comparison emission tests; the results validated the sizable effects of the outer purifier means.
在发动机试验台架上，选择了两种DOC型尾气净化器，进行了排放比对试验，验证了机外净化的效果。
On an engine test bed, two selected exhaust purifiers with DOC type experienced comparison emission tests; the results validated the sizable effects of the outer purifier means.
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