GDI喷油器电-磁-热耦合分析  

Electro- magnetic- thermal coupling of GDI injector

作　　者：程强[1] 张振东[1] 郭辉[2] 谢乃流[1] 

机构地区：[1]上海理工大学汽车工程研究所,上海200093 [2]上海工程技术大学汽车工程学院,上海201620

出　　处：《吉林大学学报（工学版）》2015年第3期806-813,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51275309);上海市教委科研创新项目(13YZ110);上海市研究生创新基金项目(JWCXSL1201);上海工程技术大学校基金项目(2011xy28)

摘　　要：汽油直喷(Gasoline direct injection,GDI)喷油器性能受温升影响较大,限制了发动机电子控制单元(Electronic control unit,ECU)对其喷油量的控制精度。针对GDI喷油器电、磁、热子系统之间的耦合关系,建立了耦合过程的物理模型,通过研究GDI喷油器工作过程中能量损耗及转化关系,揭示了电磁转化过程中产生的损耗是造成喷油器本体温升的主要原因。以电磁转化过程中能量损耗为热源,以热辐射和热传导基本理论为依据,利用ANSYS有限元软件对GDI喷油器温度场进行仿真分析,并进行了试验验证,分析了GDI喷油器本体温度场分布特点以及温升变化对喷油器性能的影响规律。结果表明,线圈和铁芯部分的温升较高,随温度升高GDI喷油器动态响应时间延长、喷油量减少,且温升受保持电流和保持脉宽的影响较大。Temperature rise greatly impacts the performance of the GDI injector and causes the ECU of an engine difficult to control fuel quantity accurately. According to the coupling relationship of electric, magnetic and thermal subsystems of the GDI injector, the physical model of the coupling process was established. The energy loss and transformation of the GDI injector in working process was explored. It is revealed that the loss of electromagnetic conversion is a key factor to cause the temperature rise of the GDI injector. The energy dissipation as heat source and the temperature field of the GDI injector was analyzed based on the finite element equation of the heat conduction and thermal radiation. The temperature field of the injector was simulated using ANSYS software; then the simulation results were verified by experiment. The effects of the temperature field distribution and the temperature rise variation on the performance of the GDI injector were analyzed. Results show that higher temperature rise is concentrated on the coil and core part, the response time of GDI injector gets longer as the temperature rises, and the injection quantity becomes lower. The valueand the pulse width of the holding current have great impact on the GDI injector performance and temperature rise.

关 键 词：动力机械工程 汽油直喷喷油器 电-磁-热耦合 有限元仿真 动态响应 

分 类 号：TK413[动力工程及工程热物理—动力机械及工程]