Abstract
Under complex driving conditions, the driving speed of pure electric
vehicles changes frequently, and there is no mathematical law to follow.
Bad working conditions will lead to the change of the driving motor
parameters. Conventional motor control PI regulator parameters are fixed
and cannot be adjusted in real time in accordance with the vehicle
driving state. The dynamic performance of the drive system decreases due
to the increase of AC/DC coupling in the high-speed field weakening
region of interior permanent magnet synchronous motor (IPMSM). To solve
the above problems, an IPMSM fuzzy single-current field weakening
control algorithm for pure electric vehicles was proposed, and the
parameters of the PI regulator were adjusted in real time through fuzzy
control to enhance the response characteristics and anti-interference
characteristics of the drive system. The optimized single-current field
weakening control method was adopted, and the a-axis and d-axis voltage
was adjusted in real time based on the vehicle speed and the output
torque, which enhanced the control performance of the vehicle in the
high-speed field weakening region. The feasibility and effectiveness of
the proposed control algorithm were verified through a simulation
comparison with the conventional PI-adjusted single-current field
weakening control algorithm.