Sensorless method of detecting plunger position in solenoid actuators
Abstract: This thesis investigates if it is possible to measure the plunger position in a Ledex 282352-023 solenoid actuator without the use of external sensors. To do this, various different methods, all based on comparing the current response to the applied voltage were evaluated from different categories such as calculation time, reliability and distinct position levels. The method that performed best in these categories was to calculate the phase difference between the voltage and the current using Fourier coefficients (FC). Model-based programming with MATLAB and Simulink was used to evaluate the performance of the methods. The Simulink model which implemented FC as measurement method is described in detail in this thesis. To run the models in real-time, hardware and software from dSpace were used which includes a MicroAutoBox II (MAB) and the program ControlDesk. This thesis was conducted in collaboration with BorgWarner.
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