本文分析了喷油系统低速不规则喷射的机理。文中根据供油压力波的稳定性和传播原理,利用特征线图解法,推出了确定各不规则喷射区边界的计算公式,讨论了喷油系统某些结构参数对低速不规则喷射问题的影响。本文还针对Ⅰ号喷油泵进行了理论计算和专题试验。结果表明,计算与实测的不规则喷射区边界具有良好的一致性。 This paper analyzes the mechanism of low speed irregular injection of fuel injection system. According to the stability and propagation principle of oil pressure wave and the characteristic line diagram method, the calculation formula for determining the boundary of each irregular ejection zone is introduced. The influence of some structural parameters of injection system on low speed irregular ejection is discussed. In this paper, the theoretical calculation and the special test for No. 1 injection pump are also carried out. The results show that there is a good consistency between the calculated and measured irregular jet boundaries.