Automotive Engineering - May 2023 - 6

TECHNOLOGY
REPORT
CHASSIS
Multimatic-made 'legs' for Ferrari's new thoroughbred
Ferrari Purosangue
front end showing
PTU mounting on
front of V12 and
suspension corners
with new Multimatic
TASV active dampers.
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
The Ferrari Purosangue scurries up the snowbound
pitches of Italy's Monte Bondone, the
Alpine peak whose auto-hillclimb exploits date
to 1925. Ferrari's first " SUV " - really, more a
genre-blurring crossover - slices through
Bondone's 38 devilish corners, gaining nearly
4,900 ft (1,494 m) of elevation over an 11.2-mile
(18-km) workout. Its 715-hp (533-kW) V12 sings
like the tragically-fated opera hero it is, to an
8,250-rpm height that's as lofty as the surrounding
Dolomites.
Emissions regulations may soon spell the end
of that barrel-chested, 6.5-L engine, whose 12
naturally-aspirated cylinders describe every
roadgoing Ferrari built between 1947 and 1973.
But the rest is modern magic, the kind of prestidigitation
that's required to transform a 4,774-lb
(2165-kg), AWD machine - the first Ferrari with
four doors and four adult-sized seats - into a
stunning performer that feels lighter and lither
than any driver would ever expect.
One showstopper is a world's-first active suspension
that traces not to Maranello, Ferrari's
hometown in northern Italy, but to a quiet suburb
north of Toronto, Canada. The Purosangue's
ingenious, electrically activated dampers are
the work of Multimatic, the publicity-shy supplier
that long has strived to stay under the radar.
But that's become impossible after a string
of successes that includes hand-building the
Ford GT; key development roles in the Aston
Martin One-77 and Valkyrie supercars and
6 May 2023
building the bonkers, turnkey Ford Bronco DR
Baja racer. And that's when Multimatic isn't
cranking out parts for some of North America's
best-selling vehicle platforms, including more
than 7 million ball joints annually.
48V dampers
For the Purosangue (pronounced " poor-ohSANG-way: "
thoroughbred) - Multimatic calls
its technology TrueActive Spool Valve Dampers
(TASV). The spool-valve part certainly isn't new.
From Formula 1 teams to the Mercedes-Benz
AMG GT and Chevrolet Camaro ZL1 1LE, the
company's spring-loaded fluid valves allow predictable
control over force-velocity curves inside
each damper. Ferrari and other demanding customers
can digitally spec and tailor the dampers
for extremely specific applications, from rock
crawling to road racing, versus the trial-anderror
of older shim-stack designs. These patented
dampers even run cooler, because of lower
internal pressures, according to engineers.
What's new is the " TrueActive " component.
On the Purosangue, each damper integrates a
liquid-cooled, 48-volt brushless electric motor,
co-developed with Ferrari, with the dual spool
valves that independently manage rebound and
compression. The power-dense electric motors
apply direct force to the Ferrari's chassis and
the dampers' piston rods through a ball-screw
and worm-gear assembly. That reduces weight
and packaging space and eliminates any need
Gregory L. Bradley, Esq.
Secretary
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
FERRARI
http://www.sae.org/sections http://www.sae.org/chapters/collegiate/
Automotive Engineering - May 2023

Table of Contents for the Digital Edition of Automotive Engineering - May 2023
