Frequency and time domain characteristics of digital control of electric vehicle in-wheel drives
Divisions of PAS
Abstract: In-wheel electric drives are promising as actuators in active safety systems of electric and hybrid vehicles. This new function requires dedicated control algorithms, making it essential to deliver models that reflect better the wheel-torque control dyna-mics of electric drives. The timing of digital control events, whose importance is stressed in current research, still lacks an analytical description allowing for modeling its in-fluence on control system dynamics. In this paper, authors investigate and compare ap-proaches to the analog and discrete analytical modeling of torque control loop in digitally controlled electric drive. Five different analytical models of stator current torque com-ponent control are compared to judge their accuracy in representing drive control dyna-mics related to the timing of digital control events. The Bode characteristics and step-response characteristics of the analytical models are then compared with those of a re-ference model for three commonly used cases of motor discrete control schemes. Finally, the applicability of the presented models is discussed.
eISSN: 2300-2506 ; ISSN: 1427-4221