SAE Update - November 2024 - 39

SAE J2954, the final step for
commercializing wireless charging
STANDARDS & COMMITTEES
that a vehicle is approaching, and this
allows the DIPS magnetic field to be
generated by the GA only when needed.
The WPT Active Scan procedure can be
accomplished without any additional
resources in the vehicle since the already
existing Wi-Fi modules in VA and GA can
be reused. The primary purpose of the WPT
Active Scan function is to allow the GAs to
remain dormant and only enable the DIPS
magnetic field when needed.
Alignment assists the driver when
approaching a charging location to align
the VA within the defined allowed offsets
over the GA. DIPS limits the range of
operation to the parking space edge.
Therefore, the VA starts the alignment
process by evaluating the horizontal
magnetic field of the GA. Once the four
vertical field coils are within range of the
VA detectors, fine alignment takes place
until the final position is reached.
Pairing aims to verify that the VA is
communicating with the correct GA it is
parked over. The VA obtains the necessary
information for pairing, including the SSID
of the Wi-Fi network of the GA and the
EVSE-ID (ID of the GA) provided by the
DIPS pairing method. Both IDs are
modulated onto the auxiliary field coils and
the VA can detect and evaluate this data.
This evaluation can start during the
approach and alignment into the parking
space. Pairing is complete when the
connection is set up and validated between
the GA and VA via Wi-Fi.
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SAE J2954 alignment witness tests
The UWB and DIPS alignment systems were
integrated into vehicles chosen by the
technology providers and set up in
accordance with SAE J2954 requirements
for parking spaces. Three independent
witnesses chosen by the SAE WPT-TF
conducted the tests scheduled by the
taskforce's alignment sub-team. Due to the
positive results and outcome of the
taskforce's review, only the DIPS test is
shown exemplarily.
Both systems were integrated into an EV
(with a VA). The test setups were
conducted in realistic environments. For the
exemplary case of DIPS, the testing was
performed in an underground garage of a
building. Three GAs were setup in adjacent
parking spaces placed in accordance with
SAE J2954.
Testing consisted of three blocks: basic
tests, environmental tests, and other tests.
Basic tests included approaches of the GA
from different directions, at different
November 2024
39

https://www.sae.org/standards/news-room https://www.sae.org/standards/news-room https://standardsworks.sae.org/standards-committees/sae-j2954-wireless-power-transfer-alignment-task-force

SAE Update - November 2024

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