Studying On Modeling And Characteristics Of High-speed Solenoid Valve For Electronic Control Fuel Injection System

With the increasing concern about the pollutant emission and energy shortage,the electronic control fuel system has become the development trend of modern diesel engine's fuel injection system. Whereas high-speed solenoid valve (HSV) is one of the most important parts of electronic control fuel system for diesel engine, its dynamic response characteristics have a significant influence on the control precision of fuel injection duration and timing. As HSV's electro-mechanical converter, high-speed powerful electromagnet's static electromagnetic force is the guarantee for HSV's reliable work and fast response speed, and HSV's dynamic response speed is of great important for improving the control precision of fuel injection duration and timing. Therefore,the purpose of studying HSV's static and dynamic characteristics, revealing the influence rules of the key parameters on HSV's static and dynamic characteristics more comprehensively, establishing the program for the HSV's multi-objective optimization, not only can contribute to the theoretical basis for the design and optimization of the HSV system, but also can provide support for improving the fuel injection system of diesel engine.The HSV's system and working principle were analyzed in this paper, by the software Ansys Maxwell and Ansys Simplorer, HSV's static finite element simulation model and dynamic united simulation model were built respectively.The superposition coefficient and damping coefficient of the two models have been identified, and the results have been verified by experimental results. It turns out that the static finite element simulation model's maximum error is 9% compared with the experimental results,and the dynamic united simulation model has a good imitative effect to the experimental results. The two models can be used to study the characteristics of HSV in next parts of this paper.Key parameters'interaction principles on HSV's electromagnetic force under overall operating conditions were analyzed. It turns out that the significant first-order factors are coil turns and armature thickness, the correlation between the EF and each self-interacting second-order factor has different effect laws to that of the corresponding first-order factor, and the interactions of coil turns and armature thickness, armature thickness and damping hole location, damping hole location and damping hole radius are of significant influence on HSV's electromagnetic force in second-order factors.In the optimization study of the HSV's dynamic behavior, the opening and closing delay time were set as optimization objectives, and the electromagnetic force at the maintaining stage was set as constraint. By the improvement of side pole radius, coil turns, armature thickness, residual air gap and spring pre-tightening force, the opening and closing delay time can be reduced 15.28% and 7.91% respectively.