为了改善严寒条件下矿用自卸车柴油机冷启动性能,对柴油机冷启动过程的启动力矩、阻力矩以及燃料着火进行了研究。结果发现:当环境温度较低时,柴油机的启动力矩减小、阻力矩增大以及燃料着火困难是导致柴油机冷启动困难的主要原因。采用一些改善措施后,柴油机的冷启动性能大大改善。 In order to improve the cold starting performance of the diesel dump truck under cold conditions, the starting torque, the drag moment and the fuel ignition of the diesel engine during the cold starting process were studied. The results show that when the ambient temperature is low, the starting torque of diesel engine decreases, the resistance torque increases and the difficulty of fuel ignition is the main reason that makes diesel engine cold start difficult. With some improvement measures, the cold starting performance of the diesel engine is greatly improved.