SAE Update - November 2024 - 38

STANDARDS & COMMITTEES
SAE J2954, the final step for
commercializing wireless charging
LEFT: WPT Active Scan triangulation between two SAE J2954 parking spaces. CENTER: Drawing of DIPS fine alignment process
between ground and vehicle assemblies. RIGHT: Ground and vehicle assemblies, DIPS pairing.
competitive advantage over a chipbased
approach requiring far-field
antennas.
* Demonstrated robust technology
readiness through public field testing.
SAE J2954 DIPS technical description
DIPS is an alignment methodology based on
localized magnetic fields which are
completely separate from the power transfer
magnetic field. The DIPS GA includes five
auxiliary coils used for alignment, each
operating at a unique frequency and
providing a defined magnetic flux. The
solenoid coil, which is wound around the
ferrite and the litz wire of the power transfer
coil, generates a horizontal field
predominantly in x-direction (driving
direction). The four planar coils, which are
placed above the litz wire, generate a vertical
field above the GA power transfer coil.
Many different solutions for the VA are
possible given the GA DIPS system is
standardized; one possibility for a DIPS VA
position sensing solution is to use double
crossed solenoidal coils wound around the
38 November 2024
ferrite at 45-degree angles to the driving
direction (e.g., with a single turn each). For
the steering information, the VA can
evaluate the ratio between the induced
voltages in coil A and coil B caused by the
horizontal field of the GA.
As an example, if the induced voltage in
coil A is higher than in the orthogonal coil
B, this means that the driver needs to steer
left. This is the " differential " aspect of DIPS.
For the braking/stopping information, the
magnitude of the signal received by the VA,
which is based primarily on the flux from
the GA's solenoidal coil, can be used.
Parking procedure
The parking procedure outlined in SAE
J2954 contains three primary elements: the
WPT Active Scan, alignment, and pairing.
Every parking event begins with the
vehicle approaching a parking space. There
can be one or several parking spaces
available. The VA transmits the necessary
frame for the active Wi-Fi scan known as a
probe request. Therefore, the GA is notified
UPDATE
IMAGES SAE International

SAE Update - November 2024

Table of Contents for the Digital Edition of SAE Update - November 2024

SAE Update - November 2024 - Cov1
SAE Update - November 2024 - Cov2
SAE Update - November 2024 - 1
SAE Update - November 2024 - 2
SAE Update - November 2024 - 3
SAE Update - November 2024 - 4
SAE Update - November 2024 - 5
SAE Update - November 2024 - 6
SAE Update - November 2024 - 7
SAE Update - November 2024 - 8
SAE Update - November 2024 - 9
SAE Update - November 2024 - 10
SAE Update - November 2024 - 11
SAE Update - November 2024 - 12
SAE Update - November 2024 - 13
SAE Update - November 2024 - 14
SAE Update - November 2024 - 15
SAE Update - November 2024 - 16
SAE Update - November 2024 - 17
SAE Update - November 2024 - 18
SAE Update - November 2024 - 19
SAE Update - November 2024 - 20
SAE Update - November 2024 - 21
SAE Update - November 2024 - 22
SAE Update - November 2024 - 23
SAE Update - November 2024 - 24
SAE Update - November 2024 - 25
SAE Update - November 2024 - 26
SAE Update - November 2024 - 27
SAE Update - November 2024 - 28
SAE Update - November 2024 - 29
SAE Update - November 2024 - 30
SAE Update - November 2024 - 31
SAE Update - November 2024 - 32
SAE Update - November 2024 - 33
SAE Update - November 2024 - 34
SAE Update - November 2024 - 35
SAE Update - November 2024 - 36
SAE Update - November 2024 - 37
SAE Update - November 2024 - 38
SAE Update - November 2024 - 39
SAE Update - November 2024 - 40
SAE Update - November 2024 - 41
SAE Update - November 2024 - 42
SAE Update - November 2024 - 43
SAE Update - November 2024 - 44
SAE Update - November 2024 - 45
SAE Update - November 2024 - 46
SAE Update - November 2024 - 47
SAE Update - November 2024 - 48
SAE Update - November 2024 - 49
SAE Update - November 2024 - 50
SAE Update - November 2024 - 51
SAE Update - November 2024 - 52
SAE Update - November 2024 - 53
https://www.nxtbook.com/smg/sae/24UPD11
https://www.nxtbook.com/smg/sae/24UPD10
https://www.nxtbook.com/smg/sae/24UPD09
https://www.nxtbook.com/smg/sae/24UPD08
https://www.nxtbook.com/smg/sae/24UPD07
https://www.nxtbook.com/smg/sae/24UPD06
https://www.nxtbook.com/smg/sae/24UPD05
https://www.nxtbook.com/smg/sae/24UPD04
https://www.nxtbook.com/smg/sae/24UPD03
https://www.nxtbook.com/smg/sae/24UPD02
https://www.nxtbook.com/smg/sae/24UPD01
https://www.nxtbook.com/smg/sae/23UPD12
https://www.nxtbook.com/smg/sae/23UPD11
https://www.nxtbook.com/smg/sae/23UPD10
https://www.nxtbook.com/smg/sae/23UPD09
https://www.nxtbook.com/smg/sae/23UPD08
https://www.nxtbook.com/smg/sae/23UPD07
https://www.nxtbook.com/smg/sae/23UPD06
https://www.nxtbook.com/smg/sae/23UPD05
https://www.nxtbook.com/smg/sae/23UPD04
https://www.nxtbook.com/smg/sae/23UPD03
https://www.nxtbook.com/smg/sae/23UPD02
https://www.nxtbook.com/smg/sae/23UPD01
https://www.nxtbook.com/smg/sae/22UPD12
https://www.nxtbook.com/smg/sae/22UPD11
https://www.nxtbook.com/smg/sae/22UPD10
https://www.nxtbook.com/smg/sae/22UPD09
https://www.nxtbook.com/smg/sae/22UPD08
https://www.nxtbook.com/smg/sae/22UPD07
https://www.nxtbook.com/smg/sae/22UPD06
https://www.nxtbook.com/smg/sae/22UPD05
https://www.nxtbook.com/smg/sae/22UPD04
https://www.nxtbook.com/smg/sae/22UPD03
https://www.nxtbook.com/smg/sae/22UPD02
https://www.nxtbook.com/smg/sae/22UPD01
https://www.nxtbook.com/smg/sae/21UPD12
https://www.nxtbook.com/smg/sae/21UPD11
https://www.nxtbook.com/smg/sae/21UPD10
https://www.nxtbook.com/smg/sae/21UPD09
https://www.nxtbook.com/smg/sae/21UPD08
https://www.nxtbook.com/smg/sae/21UPD07
https://www.nxtbook.com/smg/sae/21UPD06
https://www.nxtbook.com/smg/sae/21UPD05
https://www.nxtbook.com/smg/sae/21UPD04
https://www.nxtbook.com/smg/sae/21UPD03
https://www.nxtbook.com/smg/sae/21UPD02
https://www.nxtbookmedia.com