Sensorless Position Tracking in Steer-by-Wire Using the SONIC Method

This paper presents the application of the Search based Online Commissionable (SONIC) sensorless observer algorithm to steer-by-wire in automotive applications. The tracking performance of the observer for both mechanical and electrical rotor positions for a Surface Mounted Permanent Magnet Synchronous Machine as would be fitted in a steer-by-wire system is shown. Typical steering transients and torque feedback were used which were determined experimentally from a street legal vehicle as part of this same research.