本文阐述了国内首次在小缸径高速柴油机上采用低排热钢顶组合活塞的试验结果及分析。在195柴油机上试验研究结果表明,与铝活塞相比,除了标定高功率少数工况外,油耗率普遍降低1％～5％,噪声降低2～3dB,排放得到改善,振动基本一样。对气缸内参数的分析表明,滞燃期缩短,最高燃烧压力降低,燃烧过程较为柔和。 This paper describes the test results and analysis of the first combination of low-heat-displacement steel top combination pistons in China with small bore high-speed diesel engines. The experimental results on the 195 diesel engine show that compared with the aluminum piston, the fuel consumption rate is generally reduced by 1% -5% and the noise is reduced by 2 ~ 3dB except the calibration of high power and few working conditions. The emission is improved and the vibration is basically the same. The analysis of the parameters in the cylinder shows that the retarding period is shortened, the highest combustion pressure is reduced and the combustion process is more gentle.