Automotive Engineering - April 2023 - 8

TECHNOLOGY
REPORT
STANDARDS
SAE launches new standards doc to rate power of
electrified vehicles
SAE INTERNATIONAL
BOARD OF DIRECTORS
Todd Zarfos
President
Carla Bailo
2024 President
Srinivasa (Sri) Srinath, Ph.D
2022 President
Susan Ying, Ph.D
Vice President - Aerospace
Daniel Nicholson
Vice President - Automotive
Audley Brown
Vice President -
Commercial Vehicle
Andrew Jeffers
Treasurer
David L. Schutt, Ph.D
Chief Executive Officer
Gregory L. Bradley, Esq.
Secretary
Vehicle on a chassis dynamometer at an FEV test facility. The new SAE J908 procedure can be conducted either on a
chassis dynamometer or using wheel, or hub, dynamometers.
SAE International in late February, 2023, announced
the release of a new standards document
to provide a common testing procedure
to rate the maximum power of electrified
powertrains. The new J2908 standard, titled
" Vehicle Power and Rated System Power Test
for Electrified Powertrains, " is a voluntary procedure
to make it easier to measure and compare
the maximum power of electrified powertrains
used in hybrid-electric vehicles
(HEVs), plug-in hybrid-electric vehicles
(PHEVs) and battery electric vehicles (EVs) or
fuel-cell electric vehicles (FCEVs).
The J2908 standard establishes the framework
for testing, data post-processing and reporting
of SAE system power for an electrified
vehicle. The SAE system power is defined as
the sum of the mechanical shaft powers of all
powertrain components used for propulsion
during peak wheel power. It is a voluntary procedure,
said Michael Duoba, research engineer,
Argonne National Laboratory, and sponsor of
the document.
" The results are a familiar system power definition
in the same manner as well-established
8 April 2023
engine power ratings, thus benefitting consumers
who are considering making the switch to
an electrified vehicle, " Duoba said, adding that
he believes having a standardized testing procedure
also may help automakers and other
driveline developers validate previously-derived
physical-testing or simulation values for
individual drivetrain components.
" The flexible methodology of J2908 includes
ways to incorporate known bench test data or
make direct system measurements during a
vehicle test. The flexibility was designed to accommodate
testing by manufacturers or independent
testing laboratories, " Duoba said.
Field-leveling
" It's a process and a definition that we can all
use, " Duoba said in an interview with SAE
Media to discuss the new standard. " Every car
company has been giving their (power rating)
numbers in good faith, but maybe with a different
approach. It was obvious that this is not
sustainable the way things were headed. " He
said the power-split designs of contemporary
hybrids can be particularly complex, as can
Judy Curran
Mary Lee Gambone
Michael Weinert
Joan Wills
SAE International Sections
SAE International Sections are local
units comprised of 100 or more SAE
International Members in a defined
technical or geographic area. The purpose
of local Sections is to meet the technical,
developmental, and personal needs of the
SAE Members in a given area. For more
information, please visit sae.org/sections
or contact SAE Member Relations Specialist
Abby Hartman at abby.hartman@sae.org.
SAE International
Collegiate Chapters
Collegiate Chapters are a way for SAE
International Student Members to get
together on their campus and develop
skills in a student-run and -elected
environment. Student Members are vital
to the continued success and future of
SAE. While your course work teaches
you the engineering knowledge you
need, participation in your SAE Collegiate
Chapter can develop or enhance other
important skills, including leadership,
time management, project management,
communications, organization, planning,
delegation, budgeting, and finance. For
more information, please visit students.
sae.org/chapters/collegiate/ or contact
SAE Member Relations Specialist Abby
Hartman at abby.hartman@sae.org.
AUTOMOTIVE ENGINEERING
FEV

http://www.sae.org/sections http://www.sae.org/chapters/collegiate/

Automotive Engineering - April 2023

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