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Image credits: © Renault.
Press Release
Renault has chosen the Twizy manufacturing plant in Valladolid,
Spain, to present its new Twizy Renault Sport F1 concept car. This fun
take on the brand’s small electric car features muscular styling and
impressive performance credentials to serve as a bridge between the
world of F1 technology and that of production cars.
Twizy Renault Sport F1 sits on the wheels of a single-seater race car
and is equipped with a front splitter, side-pods, a rear wing and a
diffuser complete with an F1-style rain light which forcefully express
the concept car’s ties with motor racing’s premier category.
Twizy Renault Sport F1 is much more than eye catching concept car,
however. In addition to its spectacular look, it delivers genuine high
performance thanks to its Kinetic Energy Recovery System (KERS) which is
identical to the solution used by Renault-powered Formula 1 race cars.
The system instantly boosts power output six-fold to reach almost 100
horsepower and is capable of catapulting the car from standstill to
100kph as quickly as Renault’s highest-performing road car, Mégane R.S.
This technological gem is the fruit of close collaboration between
engineers at Renault Sport Technologies and their colleagues at Renault
Sport F1.
This extraordinary vehicle showcases Renault’s advanced expertise of
the electrical technology employed in F1, notably in the field of KERS
in which it was one of the precursors in 2009. Renault’s long-standing
commitment to motor racing’s blue ribband category provides it with a
unique technological laboratory, giving it an advantage not only in the
world of race cars but also in that of road cars.
Twizy Renault Sport F1 will be shown at major events throughout the
year, beginning with its first public appearances at the World Series by
Renault meeting at Aragon, Spain (April 27-28), and at the Barcelona
Motor Show.
F1 TECHNOLOGY APPLIED TO TWIZY
“We always said we wanted to create F1-derived technology that was
road relevant! Hopefully, this car will make a few people smile while
also making a serious point. The project was led by Renault Sport F1 and
Renault Sport Technologies, working in close conjunction with Renault’s
electric vehicle development department. KERS is a very complex system
and integrating it into another electric car was a very serious
endeavour, but they managed to make it work, delivering a huge boost of
power safely and efficiently. I’m not sure we’ll be seeing many of these
cars on our roads, but it does show that the same principles we see on
the race track can be filtered down to the road car range – this is just
the evil elder brother!” Jean-Michel Jalinier (President and Managing
Director, Renault Sport F1)
SMALL BUT TOUGH: A SPECTACULAR LOOK INSPIRED BY FORMULA 1
Twizy Renault Sport F1’s calling is immediately apparent through its
slick tyres (the same as those fitted to the Formula Renault 2.0
single-seater), as well as through its carbon splitter, side-pods and
rear wing. Its unique proportions give it the appearance of a beast that
is about to pounce yet which is still fun to drive.
Other features derived from the world of racing are its single-seater
type mirrors and diffuser, which incorporates the rain light of a
Formula Renault 3.5 car. At the same time, the bulbs of the lights have
been replaced by LEDs which, again mirroring the world of motor sport,
consume less energy.
Meanwhile, Twizy’s rear seat has made way for the KERS which is
visible inside a transparent housing. Last but not least, Twizy Renault
Sport F1 is equipped with an F1-type steering wheel from the Renault
Sport Technologies catalogue.
“Twizy Renault Sport F1 is a simple yet smart vehicle which combines
original lines and advanced technology derived directly from Formula 1.
Our objective was to reinforce Twizy’s ‘fun’ side by using F1 cues to
express its personality. In terms of both its look and performance, the
result is quite simply spectacular.” Eric Diemert (Design Director,
Renault Sport Range)
In order to express the link with Formula 1 and the Renault Sport
race car range, both Renault Sport F1 and Renault Sport Technologies
contributed to Twizy Renault Sport F1’s design.
“As far as styling was concerned, we wanted to avoid falling into the
trap of simply producing a steroid-fed Twizy. We therefore worked
closely with Renault Design to find a way of incorporating Formula 1
cues on a vehicle of this size. Although Twizy’s forms clearly
distinguish it from a single-seater race car, you can see numerous
echoes of the world of grand prix racing.” Tarik Ait Said (Project
Coordinator, Twizy Renault Sport F1)
A TWIZY BOOSTED BY F1-DERIVED TECHNOLOGY
Twizy Renault Sport F1’s performance credentials are founded on the use of the KERS employed by Renault-powered Formula 1 cars.
The KERS (Kinetic Energy Recovery System) is designed to recover some
of the kinetic energy which is generated under braking. Instead of
being lost in the form of heat, this energy is recovered and stored
before being used to momentarily boost power output, just as it is in
Formula 1.
The KERS comprises three main elements:
- An electric motor-generator unit (MGU) directly linked to the driveshaft.
- Specific lithium-ion batteries.
- A KERS Control Unit (KCU).
As its name implies the motor-generator unit serves as both a
generator and a motor. In ‘generator’ mode, it functions like a dynamo
to convert mechanical energy into electrical energy which is then stored
in a battery. To use this energy, it suffices to reverse the process.
The system then switches to the ‘motor’ mode to use this stored energy
to deliver a power boost to the wheels via the motor.
SIX TIMES THE POWER OUTPUT!
Twizy Renault Sport F1 is consequently equipped with two electric
motors, i.e. Twizy 80’s original motor (17hp/13kW) onto which an
F1-style KERS has been grafted to turn the concept car into a genuine
pocket rocket with exceptional performance credentials.
When the KERS is activated, Twizy Renault Sport F1’s power output
climbs instantly by a factor of six, from 17 to 97 horsepower (72kW).
This boost is available for approximately 14 seconds, just as it is in
the case of a Formula 1 car. Thanks to this additional power, the
concept car is capable of accelerating from standstill to 100kph in the
same time as Mégane R.S.
When the system is triggered, the maximum revs of Twizy’s motor rise
to 10,000rpm for a top speed of 110kph. The fruit of advanced
technology, the MGU-K fits inside a 10cm-diameter cylinder and can rev
to as high as 36,000rpm. The KERS is equipped with its own battery
capable of very short charge/discharge cycles. Derived directly from F1
technology, the package weighs barely 30kg, battery included.
Given that the peak revs of the KERS and Twizy’s principal motor are
36,000rpm and 10,000rpm respectively, the connection between the two was
one of the chief challenges of the project. Synchronisation is ensured
by a 1:3.6 reducer gear which uses the same drive gear as that of the F1
V8 engine.
The KERS uses a pressurised lubrication system to enable the bearings
to withstand peak revs of 36,000rpm. Meanwhile, in order to prevent the
KERS battery from overheating despite the constraints to which it is
exposed, Twizy Renault Sport F1 is equipped with water cooling. Both
these systems are existing Renault Sport Technologies solutions.
AN F1-TYPE STEERING WHEEL DERIVED FROM RENAULT SPORT TECHNOLOGIES’ RACE CAR RANGE
Twizy Renault Sport F1’s steering wheel is derived directly from that
of the Formula Renault 3.5 race car. Its functions have been adapted
for use on an electric vehicle equipped with KERS, while the rim is of a
wider diameter.
The amount of energy recovered while the Recovery mode is activated
can be adjusted using the four-position rotary knob. Another rotary knob
enables the power boost to be set at one of six pre-set levels, ranging
from 10 to 60kW.
The driver releases the energy stored by the KERS by activating the
two steering wheel-mounted paddles at the same time. To show spectators
that the system has been activated, the rain light incorporated in Twizy
Renault Sport F1’s diffuser is switched on.
The concept car comes with its own data logging system, with
information displayed on a multi-page screen situated on the steering
wheel. This display can be personalised to show information concerning
both Twizy’s and the KERS F1 electronic systems.
A wide range of parameters can be displayed in real time, including
the main battery’s level of charge, the KERS battery’s level of charge,
oil pressure, water temperature, etc.
Twizy Renault Sport F1 is also equipped with an ‘RS Monitor’ data
logging system similar to the one available for Mégane R.S. and New Clio
R.S. 200 EDC. This allows the driver to monitor a number of
performance-related parameters in real time (0-50kph time, 0-100kph
time, 50-metre standing start time, 100-metre standing start time).
A KERS FOR TWIZY? GO FOR IT!
“Twizy Renault Sport F1 serves quite simply as a bridge between the
excellence of Renault’s F1 technology and the brand’s electric vehicle
expertise. Carrying over racing technology for use with a production car
without having to make major modifications to the latter was not as
straightforward as it may seem and was a significant technological
challenge. The development of Twizy Renault Sport F1 called for some
very careful thought.” Guillaume Brotonne (Technical Manager, Twizy
Renault Sport F1)
THE COMBINED TECHNOLOGICAL EXPERTISE OF RENAULT SPORT F1 AND RENAULT SPORT TECHNOLOGIES
Renault Sport F1 and Renault Sport Technologies worked hand in hand
to convert the KERS system for use on the Twizy Renault Sport F1 concept
car and then fine-tune the resulting package.
Throughout the project, the collaboration between Renault’s two
sporting departments was exemplary, and the combination of their taste
for a challenge, their passion for motorsport and their prior knowledge
of Twizy was key to the project’s success.
Based on an idea suggested by Renault Sport F1: thanks to the
technological excellence it has acquired as a supplier of engines to a
number of F1 teams, Renault Sport F1 wanted to communicate to a wider
audience the savoir-faire it has built up in the realm of electric power
thanks to KERS which became a part of the sport in 2009.
Indeed, it was because of this very expertise that Renault’s F1
engine specialists were called in to play a part in the development of
the standard Twizy’s electric motor in 2010.
This grasp of the KERS used in F1 and of Twizy’s electric motor
provided the perfect opportunity to bring the two worlds together.
Renault Sport Technologies rises to the challenge: the Twizy Renault
Sport F1 project was put in the hands of experts who have experience of
low production-run Renault sporty vehicles. The specialists from Renault
Sport Technologies had previously been responsible for the design and
development of Renault Twizy suspension and were also able to use their
experience as the entity responsible for the Renault group’s race and
rally cars to work on this one-off project:
- Supply of a production Twizy.
- Development and adaptation of F1 components as a function of the architecture of Twizy’s motor,
- Chassis modifications and fine-tuning.
“When Renault Sport F1 asked us to work on the project, our engineers
didn’t hesitate. Renault Sport Technologies had already made a
significant contribution to the design and development of the highly
innovative Renault Twizy which meant that our input was perfectly
natural.
Thanks to our experience of race car engineering, we were able to
take elements from our FR2.0 and FR3.5 race cars and also check that the
rigidity of Twizy’s chassis and suspension was capable of handling the
additional 60kW.
Thanks to the very close working relationship we enjoy with Renault
Sport F1, we were able to combine the ‘fun’ side of the project with
some very advanced technology. We are very proud of the result.” Patrice
Ratti (General Manager, Renault Sport Technologies)
Meanwhile, the experts at Viry-Châtillon brought to the table their
integration savoir-faire and KERS expertise, including the battery, not
to mention their experience of Twizy’s own motor.
“Thanks to our experience of KERS, we were able to guide the system’s
integration in the concept car and provide the necessary support for
its fine-tuning development.” Laurent Debailleul (Electric Systems Test
Manager, Renault Sport F1)
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