Truck & Off-Highway Engineering - October 2022 - 7

TECHNICAL INNOVATIONS
CHASSIS
Electrification's impact on commercial-vehicle chassis design
Electrification in the commercial truck
and off-highway sectors is ramping up
at an increasingly rapid pace. This fundamental
change in propulsion will be
one of the most significant shifts in the
industry's history and is having ripple
effects on various aspects of chassis
design, validation and reliability. Making
matters more complicated is the lack of
fully defined standards in this segment.
This issue was discussed at length by
an expert panel at SAE's 2022 COMVEC
conference in Indianapolis.
The panel was moderated by Amrut
tions are changing on the chassis? Do
they still apply? "
All these issues pose a huge question
mark for OEMs and how they are going
Patki, director product group RCB &
steering column at Bendix Commercial
Vehicle Systems. The panelists were Colm
Bloomer, manager of systems and attributes
at Ricardo North America;
Somnath Ghorad, director of durability
simulation and development at Nikola
Motor Corp.; Collin Milliken, director of
chassis engineering at Navistar; and
James Turney, director of chassis engineering
for Daimler Truck North America.
The session explored the views and
experiences these OEMs have seen
from the implementation of electric and
other zero-emission powertrains on
aspects of chassis design such as impact
safety, packaging and validation.
A clean slate
One of the biggest challenges electrification
presents for commercial vehicle
OEMs is designing a chassis with very
little legacy knowledge. " For years, SAE
and OEMs have worked to develop all
the standards that we use to nurture
and build new chassis and go to the
next level of design, " Patki said. " And
here comes electrification! "
Patki continued, " There are no standards
established, there is no background
by which we can know things
like how do these systems integrate?
What happens if you add the battery
pack at one level of design versus another?
What kind of resonance you
are going to be at on a chassis that
has no traditional engine? What happens
with the frequencies for all the
algorithms from the past when condiTRUCK
& OFF-HIGHWAY ENGINEERING
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to move to the next level of implementation
for electrified chassis. " Our legacy
ICE designs have been fairly standard
over the years, " Bloomer said.
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Truck & Off-Highway Engineering - October 2022

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