Electrical agglomeration as a pretreatment means can reduce the exhaust particle number concentration of diesel engine. The charge of particle is an important factor affecting the coagulation process. Therefore, an experiment was carried out to study the charging characteristic of diesel particles. Zeta potential for diesel particle was used to represent the charged state and the charge of particles could be calculated according to the value of Zeta potential. Influences of various factors on the charge of particle were investigated by changing the charged voltage, internal temperature of charging zone, and the load of engine. Experimental results show that the increase of charged voltage can improve the charge and the absolute value of diesel particles. With increase of charging zone temperature, corona inception voltage declines and the charge of particle increases. The load of engine has a positive effect on the charge of particles which reaches its peak at full load.

电凝聚作为预处理手段可以降低柴油机排气颗粒数浓度。颗粒所带电荷是影响混凝过程的重要因素。因此，进行了实验研究柴油颗粒的带电特性。用柴油颗粒的Zeta电位来表示其带电状态，根据Zeta电位的值可以计算出颗粒的电荷。通过改变带电电压、带电区内部温度、发动机负载等因素，考察了各种因素对颗粒带电的影响。实验结果表明，提高带电电压可以提高柴油颗粒的带电量和绝对值。随着带电区温度的升高，起晕电压下降，颗粒带电量增加。发动机的负载对颗粒电荷有积极影响，在满负载时达到峰值。