SAE Update - April 2023 - 43

STANDARDS
& COMMITTEES
New standard addresses the complexity of power
ratings for conventional vehicles vs electric
A new SAE Information Report (IR) provides test
methods and determination options for evaluating the
maximum wheel power and rated system power of
vehicles with electrified powertrains. The scope of this
document encompasses passenger car and light- and
medium-duty (GVW <10000 pounds) hybrid-electric
vehicles (HEVs), plug-in hybrid electric vehicles
(PHEVs), battery electric vehicles (BEVs), and fuel-cell
electric vehicles (FCEVs). These testing methods can
also be applied to conventional ICE vehicles,
especially when measuring and comparing wheel
power among a range of vehicle types.
J2908_202301 - Vehicle Power and Rated System
Power Test for Electrified Powertrains includes a
definition and determination methodology for a rated
system power that is comparable to traditional
internal combustion engine power ratings (e.g., SAE
J1349 and UN ECE R85). The general public is most
accustomed to " engine power " and/or " motor power "
as the rating metric for conventional and electrified
vehicles, respectively. Wheel power will always be a
lower-power result, owing to losses in the drivetrain
that take power away from the power-producing
components as it flows to the wheel. The methods in
this document for determining rated system power
were developed recognizing that no single approach
is suitable for all powertrains without some variations
specific to the powertrain type (e.g., BEV vs HEV) and
the limits of test practicality.
Additional power-related tests are included to address
unique operational capabilities of electrified vehicles.
The IR was sponsored by longtime SAE member
Mike Duoba of Argonne National Laboratory.
UPDATE
Mike Duoba, SAE Fellow and long-standing
member of the SAE Hybrid-EV Committee
often finds himself under the hood doing
hands-on work at Argonne National laboratory.
" I was motivated to sponsor the
IR because I have been a longstanding
member of the HybridEV
Committee, and this standard
had not made much progress for
many years because it was such a
challenge, " he said. " Perhaps I was
drawn to it because it is not a
simple problem and could require
some re-thinking about what is a
power rating and what does
" maximum power " mean in the
context of the complex powertrain
system in hybrids and EVs. " n
April 2023
43
Argonne National Laboratory

https://www.sae.org/standards/content/j2908_202301/ https://www.sae.org/standards/content/j2908_202301/

SAE Update - April 2023

Table of Contents for the Digital Edition of SAE Update - April 2023

SAE Update - April 2023 - Cov1
SAE Update - April 2023 - Cov2
SAE Update - April 2023 - 1
SAE Update - April 2023 - 2
SAE Update - April 2023 - 3
SAE Update - April 2023 - 4
SAE Update - April 2023 - 5
SAE Update - April 2023 - 6
SAE Update - April 2023 - 7
SAE Update - April 2023 - 8
SAE Update - April 2023 - 9
SAE Update - April 2023 - 10
SAE Update - April 2023 - 11
SAE Update - April 2023 - 12
SAE Update - April 2023 - 13
SAE Update - April 2023 - 14
SAE Update - April 2023 - 15
SAE Update - April 2023 - 16
SAE Update - April 2023 - 17
SAE Update - April 2023 - 18
SAE Update - April 2023 - 19
SAE Update - April 2023 - 20
SAE Update - April 2023 - 21
SAE Update - April 2023 - 22
SAE Update - April 2023 - 23
SAE Update - April 2023 - 24
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SAE Update - April 2023 - 37
SAE Update - April 2023 - 38
SAE Update - April 2023 - 39
SAE Update - April 2023 - 40
SAE Update - April 2023 - 41
SAE Update - April 2023 - 42
SAE Update - April 2023 - 43
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SAE Update - April 2023 - 60
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