发动机喷油器用电磁直线执行器动态建模与试验

Modeling and Experiment of Electromagnetic Linear Actuator for Fuel Injector of Engine

针对发动机电控喷油器中电-机能量转换机构存在的问题,基于永磁自锁原理提出了一种电磁直线执行器(EMLA)。在考虑涡流、结构尺寸及边缘效应等影响因素下,采用等效磁路法建立了EMLA的动态模型,并通过仿真数据与样机试验数据的对比,验证了动态模型的正确性,使其可作为分析EMLA动态特性的有效工具。分析表明,EMLA在0.5 MPa开启油压条件下其过渡时间为1.57 ms(行程0.25 mm),满足发动机高速喷射的要求,并且因其无需保持电流而可提高发动机的经济性。

Based on the theory of permanent magnet latching, an electromagnetic linear actuator （EMLA） for a fuel injector of engine was presented. Using method of equivalent magnetic circuit, the dynamic model of the EMLA was established. Eddy current, dimensions of components, and fringing effect were taken into account in modeling. Using PWM method and H-bridge driver circuit, the prototype of the EMLA was tested on the test bed. The experimental and simulated data agreed well and the model was validated. The results show that under 0.5 MPa supply pressure, the transition time of the EMLA was 1.57 ms over 0.25 mm stroke. The EMLA had good transient characteristics and met the working requirement of the fuel injector. Furthermore, because of no holding current, the fuel economy of engine was improved.