FLATNESS BASED CONTROL OF A DUAL COIL SOLENOID VALVE

This paper presents first results in the attempt to control a dual coil solenoid valve by means of a flatness based approach. First the modeling effort is described, then the differential flatness of the system is shown. The modeling results revealed that the system lacks controllability, when considering one coil only for actuating the valve. Therefore a suitable strategy for energizing both coils has been developed. The flatness property then is used to design feasible reference trajectories for the spool motion with the following properties: soft-landing of the spool, minimal driving current, feasible subject to voltage constraints. Simulation results demonstrate the usefulness and robustness of the approach.