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(1)改进燃烧系统在拖拉机柴油机中,分开式燃烧室的排放污染物比直喷式燃烧室的排放污染物要低得多,因直喷式燃烧室的排放对各种因素的变化很敏感(如压缩余隙对CO、HC、碳烟的生成有一定影响,应该努力减小压缩余隙),由于经济性的原因,燃烧室从分开式发展向直喷式的趋势是明显的。直喷式燃烧室的NO_X生成量高是个较突出的问题,
(1) Improving the combustion system In a tractor diesel engine, the emission of pollutants in the split combustion chamber is much lower than that of the direct injection combustion chamber. The emission of the direct injection combustion chamber is sensitive to changes in various factors (For example, the compression clearance has certain influence on the generation of CO, HC and soot, and efforts should be made to reduce the compression clearance.) Due to the economic reasons, the tendency of the combustion chamber to develop from separate mode to direct-injection mode is obvious. Direct injection combustion chamber NO_X high production is a more prominent issue,