2007 Interactive Registration Document - Renault

02 RESEARCH
MANAGEMENT REPORT
AND DEVELOPMENT
2.2.2.3 TRAVELING COMFORT
Renault is a volume manufacturer with recognized expertise and a competitive
edge to maintain in the fi eld of traveling comfort. The range of topics covered
by research studies refl ects the diversity of “parameters” by focusing on:
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Logan “Renault eco2 ” Concept
A technical demonstration vehicle that took part in the Michelin
Challenge Bibendum in Shanghai.
Logan “Renault eco²” Concept is a highly economical vehicle that
is also ecologically minded, since it satisfi es the three criteria of
Renault eco² concerning production, use and recycling. In terms
of CO emissions, the Logan “Renault eco²” Concept has been
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homologated at just 97 g/km (NEDC standard combined cycle),
consuming just 3.8 l/100 km.
Fitted with a B30 c ompatible 1.5 dCi (63 kW/85 hp) engine, Logan
“Renault eco² Concept” features a host of enhancements and
technical solutions that are development paths for future Renault
vehicles. These solutions concern:
n powertrain: modified pistons and injection system to improve
combustion; detailed studies on play and lubricants to minimize
friction, new gearbox staging;
acoustic performance: reducing all exterior and interior sources of noise
(engine noise and vibrations, tire noise, bodywork resonance, etc.);
climate control: air conditioning;
visibility and feeling of space;
comfort and ergonomics: by developing a simple, intuitive user interface;
materials, etc.
Renault is also looking at changes in user behavior, a subject that covers both the
interior and exterior of its vehicles, and is working on connectivity. Concerning
on-board telephone use, the future lies not in simple hands-free systems, of the
type used by pedestrians, but in systems tailored to in-car use that detect the
user’s telephone whenever he/she gets into the car. For example, a Bluetooth
system with a voice recognition function will let users make and receive calls
without touching the phone and without opening the directory.
In the fi eld of passenger comfort, Renault is focusing on solutions that respect
the environment. The aim is to sidestep a trend that could lead to vehicles
consuming more energy to ensure the comfort of passengers than to get them
from A to B. Renault vehicles of the future will consume less energy while
providing an identical or higher level of traveling comfort. Air conditioning, for
example, is at the heart of this approach.
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n aerodynamics: reduced Cd through the use of Vortex generators
(small aerodynamic roof-mounted components that reduce drag);
a fl exible splitter under the front bumper, wheel fairings and a rear
spoiler;
n running gear: Logan “Renault eco²” Concept is shod with Michelin
“Pure” 185/65 R15 tires with low rolling resistance. Toe-in and
camber were optimized as was the braking system, as part of
systematic efforts to reduce friction.
The dashboard of Logan “Renault eco²” Concept has a “gearshift
indicator” feature to help the driver optimize fuel consumption and
cut CO emissions. With this function, the Renault team taking part
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in Challenge Bibendum turned in a strong performance, producing
71g/km of CO . 2
2.2.2.4 DYNAMIC PERFORMANCE
The studies conducted by Renault focus primarily on the chassis, and thus
driving performance, vehicle stability and steering management.
The “ active drive” system (four drive wheels) of the future Laguna GT Coupé is
an example of how R&D studies are turned into real applications.
Active drive 4WD: on conventional vehicles, only the front wheels turn. Turning
the rear wheels at the same time reduces the turning circle, thus making parking
and avoidance maneuvers easier for enhanced active safety and driving comfort.
More specifi cally, an electrical actuator on the rear axle turns the rear wheels.
They turn either at the same time as the front wheels (for increased stability) or
in the opposite direction (for easier handling). This chassis comes into its own
in diffi cult braking conditions or when swerving to avoid obstacles.
Renault won an innovation award from “l’Automobile Magazine” for this system
on January 9, 2008.
64 Registration Document Renault 2007
Find out more at www.renault.com
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