第三代汽油清净剂在保持发动机喷嘴、进气阀清洁的同时，增加了燃烧室沉积物(CCD)，这将增加部分污染物的排放。
Although third generation gasoline detergent additives keep nozzles and intake valves of engines clean, they simultaneously increase combustion chamber deposits (CCD).
燃烧室积碳提高了排气污染。机油必须被注入以减少这类沉积。
Combustion chamber deposits increase exhaust emissions. Oils must be formulated to reduce such deposits.
为了查明分开式燃烧室柴油机燃烧时碳粒在燃烧室壁面上的沉积速率，提出了一种测量方法。
In order to find out how fast the diesel combustion particles deposit on the combustion chamber wall, a measuring method was developed.
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