Automotive Engineering - September 2019 - 15

TECHNOLOGY REPORT

ELECTRIFICATION

ZF shifts EV transmission efficiency up a gear
ZF R&D is driving towards
2-speed EVs and called
its 2-speed concept
transmission "a paradigm shift
for electromobility."
2020 Mustang
Shelby GT500.
its claimed 1-100-0 mph time of 10.3s
(Ford steadfastly refused to commit to
a figure for the car's 0-to-60 mph acceleration) by saying the GT500 is the
most-powerful street-legal Ford ever
offered-for "the true ponycar enthusiast who wants supercar performance."
He added the car's validation included
more than 5500 laps at racetracks
across the U.S.

FROM LEFT: FORD; ZF

First Mustang dual-clutch

The Tremec TR-9070 7-speed DCT was
specified largely for its ability to deliver
fast and smooth shifts, said Morgan.
The design has five friction plates for
the odd-gear pack, while gears 2-4-6
have six friction plates. Although it's a
wet-clutch design, Ford said transmission fluid is applied to the clutch surfaces only during "thermal events" to
minimize parasitic losses and optimize
cooling.
The TR-9070's electrohydraulic shift
mechanism employs low-leak solenoids
that Morgan claims can execute shifts in
as little as 80 milliseconds if the driver
selects sport mode, one of five distinct
modes (normal, sport, track, drag,
launch) of automatic operation. The
transmission of course can be manually
shifted via steering-wheel paddles.
The transmission's final drive is 3.73:1
and power flows through a Torsen limited-slip differential. The 2020 Mustang
Shelby GT500 goes on sale later this
year starting at $73,995 "all in," Morgan
grinned. A Carbon Fiber Track Package
can be selected to hike the price for
those who must.
Bill Visnic

AUTOMOTIVE ENGINEERING

ZF Project Engineer Volker Vogel
checked that the Lausitzring test track
ahead was clear and announced: "Now
from stationary on full throttle." From
the rear of the prototype van came the
almost instant and familiar whine of a
very busy electric motor as the speed
built. Then, the unexpected: A slight
change in volume at 70 kph (44 mph)
as the transmission shifted to a second
gear. "It is only at prototype stage."
Implicit in Vogel's words was the
need to make allowances. But that was
not necessary; as shifters go, this is a
real smoothie.
The EV transmission debate for passenger vehicles has so far been on the
side of a single ratio, mainly for reasons
of cost, complexity and weight. But ZF
reckons it is time to look again at the
math-and has decided that for many
applications, two ratios make sense.
It seems a natural thing to do from the
manufacturer whose first initial stands
for Zahnradfabrik: gear factory.
Automotive Engineering recently had
an early drive experience of the
2-speed transmission at Lausitzring,
between Berlin and Dresden. There,
Stephan Demmerer, Head of ZF
Advanced Engineering e-Mobility, plainly regarded the new transmission as a
"paradigm shift for electromobility;"
pun intended. A totally new design, its
optimal combined efficiency is claimed
to be 4.7% better than that of a comparable single-speed.
This could be honed if the "sailing
mode" is linked via the car's CAN com-

munication to a GPS/camera system able
to anticipate downgrades, corners, traffic
light changes and other predictive scenarios in both urban or motorway situations. It also has scalability, embracing
heavier and faster vehicles, and better
tackles towing, explained Demmerer.
The new transmission also has an
automatic hill-start capability when
both clutches are closed. The compact
2-speed unit incorporates both shift
and power electronics.

Efficiency sweet spot

In the prototype, the 2-speed is claimed
to deliver more than 200 km/h (125
mph) compared to a single speed's 160
km/h (100 mph) from a series production 140-kWh motor. The real aim is to
keep in the motor's efficiency sweet
spot to reduce motor rotation speed.
"With longer range we can use a smaller battery, which reduces cost and
weight," said Demmerer. "The 2-speed
transmission can be accommodated in
a package similar to that of a single
speed. So we are developing a modular
and scalable transmission and e-motor
set-great combinations!"
A new e-motor is also being developed with a maximum power rating of
140 kW. The present situation of OEMs
having to choose between high initial
torque or high top speed may be resolved by 2-speed use. ZF's 2-speed
gearbox has been designed to cope
with motors delivering outputs up to
250 kW.
Stuart Birch

September 2019 15



Automotive Engineering - September 2019

Table of Contents for the Digital Edition of Automotive Engineering - September 2019

Automotive Engineering - September 2019
Contents
Editorial: There is no substitute for ˜Automotive Grade"
Standards News
Supplier Eye
What we’re driving
Technology Report
Road Ready
Engineering the 2020 Chevrolet Corvette
Stuck on structural adhesives
Rethinking ADAS materials
Inside VW’s expanding Silicon Valley lab
Product Briefs
Reader Feedback
Companies Mentioned, Upcoming, Ad Index
Q&A
Automotive Engineering - September 2019 - Intro
Automotive Engineering - September 2019 - Automotive Engineering - September 2019
Automotive Engineering - September 2019 - Cover2
Automotive Engineering - September 2019 - 1
Automotive Engineering - September 2019 - Contents
Automotive Engineering - September 2019 - 3
Automotive Engineering - September 2019 - Editorial: There is no substitute for ˜Automotive Grade"
Automotive Engineering - September 2019 - 5
Automotive Engineering - September 2019 - Standards News
Automotive Engineering - September 2019 - 7
Automotive Engineering - September 2019 - Supplier Eye
Automotive Engineering - September 2019 - What we’re driving
Automotive Engineering - September 2019 - Technology Report
Automotive Engineering - September 2019 - 11
Automotive Engineering - September 2019 - 12
Automotive Engineering - September 2019 - 13
Automotive Engineering - September 2019 - 14
Automotive Engineering - September 2019 - 15
Automotive Engineering - September 2019 - Road Ready
Automotive Engineering - September 2019 - 17
Automotive Engineering - September 2019 - 18
Automotive Engineering - September 2019 - 19
Automotive Engineering - September 2019 - Engineering the 2020 Chevrolet Corvette
Automotive Engineering - September 2019 - 21
Automotive Engineering - September 2019 - 22
Automotive Engineering - September 2019 - 23
Automotive Engineering - September 2019 - 24
Automotive Engineering - September 2019 - Stuck on structural adhesives
Automotive Engineering - September 2019 - 26
Automotive Engineering - September 2019 - 27
Automotive Engineering - September 2019 - Rethinking ADAS materials
Automotive Engineering - September 2019 - 29
Automotive Engineering - September 2019 - Inside VW’s expanding Silicon Valley lab
Automotive Engineering - September 2019 - 31
Automotive Engineering - September 2019 - 32
Automotive Engineering - September 2019 - Product Briefs
Automotive Engineering - September 2019 - 34
Automotive Engineering - September 2019 - 35
Automotive Engineering - September 2019 - 36
Automotive Engineering - September 2019 - 37
Automotive Engineering - September 2019 - Reader Feedback
Automotive Engineering - September 2019 - Companies Mentioned, Upcoming, Ad Index
Automotive Engineering - September 2019 - Q&A
Automotive Engineering - September 2019 - Cover3
Automotive Engineering - September 2019 - Cover4
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