Research on the Influence of Moving Iron Core End Distance on Dynamic Response Characteristics of High-Speed Solenoid Valve for Turbocharger

Abstract

To address the urgent demand for fast response and reliable sealing in high-speed solenoid valves used for turbocharger wastegate control, and to resolve the issue of poor matching between the structural parameters of the moving iron core and its dynamic performance, an optimization study was conducted on the key parameter—the working length of the moving iron core. Taking a certain type of solenoid valve as the research object, a two-dimensional axisymmetric finite element model of the electromagnetic field was established. The working length of the moving iron core was set as the critical variable, and parametric static magnetic field simulations were performed using ANSYS Maxwell software to analyze the influence of length variation on the steady-state electromagnetic force. Furthermore, by combining the spool motion equation with the spring load, transient field simulations were carried out to obtain the displacement–time response characteristics of the moving iron core under different lengths. Simulation results show that the length of the moving iron core has a significant impact on both the opening and closing times of the solenoid valve. When the working length is 12.2 mm, under given current and spring parameters, the solenoid valve achieves a favorable balance of dynamic performance: its opening time is reduced by approximately 18% on average compared with other design alternatives, and the closing impact is effectively suppressed. This study proposes a finite-element-based method for designing and evaluating the moving iron core length in solenoid valves, clarifies the intrinsic relationship between this parameter and dynamic response, and provides a theoretical basis for the optimal design of similar high-speed solenoid valves.