压电式喷油器两次喷射问隔时间分析及影响

摘要

In order to meet the requirement of main and pilot injections in an electronically controlled diesel engine, the dwell time between two injections of piezoelectric injector was analyzed. The structure and work principle of piezoelectric injector were briefly described. The effect factors of dwell time were analyzed, such as hydraulic delay time and electric response time, and the determining rule of interval time of main injection and pre-injection was presented. The experimental data was used to verify the effect of interval time between two injections, and measure the real minimal interval time between two injections. The effects of the injection pressure in high pressure line and the interval time between two injections on the fuel injection quantity were analyzed.%为满足柴油机实现主预喷射要求,进行了压电喷油器两次喷射间隔时间的分析和测试研究.简述压电喷油器的组成和工作原理,分析了两次喷射间隔时间的影响因素,讨论了液力延迟时间、电力延迟时间等参数的影响,提出了两次喷射间隔时间的确定原则；结合试验数据分析两次喷射间隔时间的影响,确定了实际的最小喷油间隔时间,两次喷射间隔时间和高压油管压力波动对喷油量的影响作用.