Abstract:

With an electronic fuel injector as the object, a new magnetic circuit structure was developed by adding a ring made by non-magnetic material between the core and guide pipe in order to improve its dynamic response performance. Both of the original and improved injector's electromagnetic performances were analyzed and the influence of the yoke's thickness on its electromagnetic performance was also studied by using the electromagnetic field simulation. The results show that adding a non-magnetic shell can speed up the rate of electromagnetic force's rise, reduce the opening response time effectively but it will cause longer closing response time due to the increase of saturated electromagnetic force. Reduction of the thickness of yoke has little effect appropriately on the rate of the electromagnetic force's rise and since it increases the reluctance, it can decrease the saturated electromagnetic force and reduce the closing response time. Based on the analyses, an optimization of the injector was developed and experiences were conducted to verify its effectiveness. Experimental data indicates that the improved injector can reduce the opening response time by 0.25ms and closing response time by 0.3ms.  

Key words: electronic fuel injector, dynamic response performance, non-magnetic ring, thickness of yoke

摘要：

为提高喷油器的动态响应性能，以某款电控喷油器为研究对象，通过在其铁芯与导向管之间增加由不导磁材料制成的隔磁环开发了一种新型磁路结构。通过电磁场仿真分析了改进前后喷油器电磁性能的变化特点以及轭铁厚度对电磁性能的影响规律。结果表明：增加隔磁环能加快电磁力的上升速度，有效缩短喷油器的开启滞后时间，但饱和电磁力增大，造成落座滞后时间延长;适当减小轭铁厚度基本不影响电磁力的上升速度，但减小轭铁厚度会使磁阻增大，饱和电磁力降低，这样可有效缩短落座滞后时间。根据以上分析结果对喷油器进行了综合优化，并通过实验对其改进效果进行了验证，结果表明：优化后与优化前相比，喷油器的开启滞后时间缩短了0.25ms，落座滞后时间缩短了0.3ms。

关键词: 电控喷油器, 动态响应性能, 隔磁环, 轭铁厚度