State estimation for fast-switching solenoid valves — A Nonlinear sliding-mode-observer approach

This paper studies state estimation for a dual coil solenoid valve, based on a nonlinear Sliding-Mode-Observer (NLSMO). A simple model of the solenoid is presented that might be applied for different types of electromagnetic actuators. Solely current and voltage measurement is used to observe the position trajectory of the moving armature. By simulation, it is shown that the states can be reconstructed even under parameter and modeling uncertainties. Experimental results on a lab test rig validate the robust behavior of the proposed observer, and are thoroughly discussed.