直接喷射式柴油机的燃烧过程在冷起动、加热、较长时间的空转或滑行等不利的运转条件下会冒白烟或蓝烟,M燃烧室尤其如此。这是与球形燃烧室、喷咀位置、温度和气体的混合等都有关的。可以说,直接喷射式的优点是付出这些消极因素换来的。西德曼公司在球形燃烧室里加了一个梯阶后,已能较前减少白烟或蓝烟量一半以上。梯阶 The combustion process of a direct injection diesel engine can take white smoke or blue smoke under unfavorable operating conditions such as cold start, heating, idling or coasting for a long time, and the like, especially in the M combustion chamber. This is related to the spherical combustion chamber, nozzle position, temperature and gas mixture. It can be said that the direct injection has the advantage of paying these negative factors in return. The Westman company in the spherical combustion chamber plus a step, has been able to reduce the white smoke or more than half the amount of blue smoke. Ladder