随着越来越多的汽车被制造和使用，这些汽车排气管里的排放物所包含的有毒气体的总量也越来越多。
As more and more cars are produced and used, so the emission from their exhaust-pipes contains an ever larger volume of poisonous gas.
系统工作原理是：DPF过滤柴油机排气中的颗粒物（PM），从而使排放达到相应的标准。
The working principle of the system is: DPF filters the particulate matter (PM) in diesel engine exhaust, to make emission up to certain standard.
约10％-30％的燃烧产物会以颗粒物状态随尾气排放到大气中，而其余大部分则沉积到发动机、排气系统及催化转化器的表面。
Only about 10%-30% products will be emitted as PM into atmosphere through tailpipe, but most parts will deposit on surface of engine, exhaust system and catalytic converter.
催化剂技术是治理汽车排气污染物的重要手段之一，催化转化器是控制汽车尾气排放的主要设备。
Catalytic technique is one of the major way in purification of automotive exhaust gases, and catalytic converters are main devices for control of automotive emission.
排气中最大量的排放物是在怠速和低速运行时产生的。
The greatest amount of exhaust emissions are produced at idle and during low-speed operation .
排气中最大量的排放物是在怠速和低速运行时产生的。
The greatest amount of exhaust emissions are produced at idle and during low-speed operation.
排气流过三元催化器时，废气中多余的氢气和氮氧化物发生氧化还原反应，进一步降低排放。
When exhaust flow flows through a three-way catalyst, redundant hydrogen and nitrogen oxides in waste gas are subjected to oxidation-reduction reaction to further reduce discharge.
论述汽车有害排放物的危害、生成机理与控制技术 ，就宁波市控制汽车排气污染问题提出若干建议 。
The paper analysed the gravity and harmfulness of motor vehicle exhaust pollution from airborne pollution condition and proposed relative countermeasure.
采用如低起燃温度催化剂、密耦催化剂、HC捕集器、二次空气注入和电加热催化剂等在内的排气后处理技术，可以有效地减少污染物尤其是HC的排放。
It may effectively reduce the HC emissions to use a catalyst with low light-off temperature, close-coupled catalyst, HC traps, second air injection and electrically heated catalyst.
柴油机在不同运转工况下其排气污染物的排放量是不同的。
The emission of a diesel engine differs in different operating conditions.
柴油机在不同运转工况下其排气污染物的排放量是不同的。
The emission of a diesel engine differs in different operating conditions.
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