High-level model of dynamic pressure sensor

V magistrskem delu je predstavljen razvoj visokonivojskega modela za simulacijo delovanja integriranega dinamičnega tlačnega senzorja. Glavni element elektronskega dela senzorja je namensko integrirano vezje z vgrajenim mikroprocesorjem, ki z digitalnim procesiranjem signala v realnem času odpravlja popačenja tlačnega signala zaradi raznih neželenih pojavov. Model omogoča grafični vpogled v delovanje kompenzacijskega algoritma in opazovanje časovnega poteka internih spremenljivk z namenom analize ter optimizacije algoritma. Za realizacijo modela je uporabljeno programsko okolje Matlab in Simulink. Opisan je princip delovanja integriranega tlačnega senzorja in poudarjen pomen zanesljivosti kompenzacijskega algoritma. Predstavljene so tudi ostale metode analize delovanja algoritma ter njihove pomanjkljivosti. Pred modeliranjem je prikazana še priprava vhodnega signala za model ter razložen pomen določenih sprememb na signalu. Model je razdeljen na dva glavna dela. Prvi del obsega mehanski in elektronski model senzorja, drugi del pa je simulacija izvajanja kompenzacijskega algoritma. V nadaljevanju je natančno opisan postopek modeliranja, predstavljeno pa je tudi delovanje posameznih elementov integriranega tlačnega senzorja. Razumevanje njihovega delovanja je namreč pogoj za uspešno modeliranje. Razložen je tudi izvor neželenih pojavov, njihov vpliv na tlačni signal ter njihovo modeliranje. Natančnost rezultatov modela potrdimo s primerjavo z rezultati realnega senzorja, demonstrirana pa je tudi uporabnost modela na praktičnem primeru. Na koncu je opisan še postopek določanja prenosne funkcije sistema z razlago kako nam poznavanje le-te lahko koristi.The thesis presents development of a high-level model for simulating the behavior of an integrated pressure sensor. The main element of the electronic part of the sensor is an application specific integrated circuit with built-in microprocessor, which uses digital signal processing to eliminate pressure signal distortions, caused by various unwanted phenomena in real time. The model provides a graphical insight into operation of the compensation algorithm and observation of the time flow of internal variables in order to analyze and optimize the algorithm. Matlab and Simulink are used to realize the model. The principle of operation of integrated pressure sensor is described and the importance of reliability of compensation algorithm is emphasized. Other methods for analyzing operation of the algorithm and their deficiencies are presented as well. Before modeling, the preparation of the input signal for the model is also presented, and the significance of certain changes on the signal is explained. The model is divided into two main parts. The first part comprises a mechanical and electronic sensor model, while the second part presents a simulation of the compensation algorithm. The modeling process is described in detail, and the operation of individual elements of the integrated pressure sensor is presented. Understanding the operation of these is a prerequisite for successful modeling. The sources of undesirable phenomena, their influence on the pressure signal and their modeling are also explained. The accuracy of the results of the model is confirmed by comparing the simulation results with the results of real sensor, while the usefulness of the model is demonstrated on a practical case. Finally, the procedure for determining the transfer function of the system is described with an explanation of how it can be useful to us