  Electric vehicle (EV) has emerged as a transformative force for the
sustainable and environmentally friendly future. To alleviate range anxiety
caused by battery and charging facility, dynamic wireless power transfer (DWPT)
is increasingly recognized as a key enabler for widespread EV adoption, yet it
faces significant technical challenges, primarily in precise coil alignment.
This article begins by reviewing current alignment methodologies and evaluates
their advantages and limitations. We observe that achieving the necessary
alignment precision is challenging with these existing methods. To address
this, we present an innovative RFID-based DWPT coil alignment system, utilizing
coherent phase detection and a maximum likelihood estimation algorithm, capable
of achieving sub-10 cm accuracy. This system's efficacy in providing both
lateral and vertical misalignment estimates has been verified through
laboratory and experimental tests. We also discuss potential challenges in
broader system implementation and propose corresponding solutions. This
research offers a viable and promising solution for enhancing DWPT efficiency.
