Diesel engines are the versatile power source for passenger cars and commercial vehicles but have difficulties in engine cold start and idle stability. As the diesel engine combustion ignition depends upon the temperature at the end of the compression, the cold ambient conditions make the fuel ignition difficult and thus the engine start. When the ambient temperature drops to a very low level, it will further aggravate the cold start, idle stability and cold start emissions. The cold start performance of diesel engines depends upon a number of factors which can be classified into four categories; fuels properties, lubricants, engine geometry and fuel injection strategy. This review paper gives an insight into these factors and highlights the cold start aids in the modern engine design

柴油发动机是乘用车和商用车的通用动力源，但在发动机冷启动和怠速稳定性方面存在困难。由于柴油机的燃烧点火取决于压缩结束时的温度，寒冷的环境条件使燃油点火困难，从而使发动机启动。当环境温度降至非常低的水平时，它将进一步加剧冷启动，怠速稳定性和冷启动排放。柴油机的冷启动性能取决于许多因素，这些因素可分为四类：燃料特性，润滑剂，发动机几何形状和燃料喷射策略。这篇评论文章深入了解了这些因素，并重点介绍了现代发动机设计中的冷启动辅助装置