| As the core component of the electronically controlled fuel injection system,the high-speed solenoid valve plays a decisive role in the entire fuel injection process.In the context of the continuous improvement of the precision of the injector and the injection pressure,it is required to be able to generate greater electromagnetic force and faster response speed in a limited space.In this paper,a high-speed solenoid valve with an embedded permanent magnet structure is used as the research object,and the influence factors of its static force density,transient response and temperature rise characteristics are studied.Finally,its performance is optimized through a combination of simulation analysis,experimental design and proxy model.The main research work of the full text is as follows:1.The structure and working principle of the embedded permanent magnet high-speed solenoid valve are analyzed,and the advantages of the structure compared with the traditional solenoid-type high-speed solenoid valve are explained with the help of the magnetic network analysis method.In order to make better use of the performance advantages,according to its working environment,suitable magnetic materials and driving parameters are selected for each component.Then the static finite element simulation model of the embedded permanent magnet high-speed solenoid valve was established using Ansys Maxwell software,and the established static finite element simulation model was indirectly verified through the test data.2.Using the established static simulation model,the electromagnetic force density of the embedded permanent magnet type high-speed solenoid valve and the traditional solenoid type high-speed solenoid valve were compared under the same working conditions,and the electromagnetic force density increased by 32.5% on average.The influence of the characteristic parameters of the coil,the characteristic parameters of the permanent magnet,the characteristic parameters of the armature and the characteristic parameters of the iron core on the electromagnetic force density is analyzed in the full-common plane.And using the method of quantitative analysis,it is concluded that the number of coil turns,armature radius,and internal magnetic pole radius are the key factors that affect the electromagnetic force density.3.An electrical-magnetic-mechanical-hydraulic-thermal multi-physics transient co-simulation model of embedded permanent magnet high-speed solenoid valve was established using the Ansys Workbench simulation platform.Using the theory of experimental design and correlation analysis,the relationship between the number of coil turns,peak current,first-order holding current,second-order holding current,permanent magnet thickness,permanent magnet height and solenoid valve opening and closing response time is explored.Then with the help of the electro-magnetic-thermal module in the multi-physics transient joint simulation model,the influence of driving parameters such as the number of coil turns,peak current magnitude,first-order sustaining current and second-order sustaining current on the energy loss and temperature of the system is explored.4.Combining experimental design methods,proxy model technology and multi-objective optimization algorithms,the total response time of the embedded permanent magnet high-speed solenoid valve during transient operation,the electromagnetic force density at a specific position in the lifting phase,and the temperature of the coil are constructed as the optimization objectives,and multi-objective optimization model constrained by lifting force and maintaining force.The optimization model is used to optimize the design of the embedded permanent magnet high-speed solenoid valve,under the premise that the temperature of the coil remains stable,the electromagnetic force density is increased by 11.43%,and the total response time is reduced by 21.76%.This provides theoretical guidance for the development of solenoid valves with strong electromagnetic force density,high response and high reliability. |
