electric & 1.3 liter diesel
(from General Motors
Press Release) Dynamic, Versatile E-Flex-Concept Opel
Flextreme. Emits less than 40 g/km CO2
Vehicle Features 55 Km of Emissions-Free Range
E-Flex architecture with diesel engine extends driving range
Dynamic, sporty, compact electro-monocab concept car
FlexDoors and FlexLoad: New for doors, tailgate and luggage
solutions and an extra mobility option
Opels Flextreme concept
car, which makes its premiere at the International Motor Show (IAA)
in Frankfurt (September 13 23, 2007), boasts the body of a dynamic
monocab, as well as the completely new environmentally friendly
E-Flex electric propulsion concept and a host of innovative details.
Flextreme is part of GMs ongoing commitment to develop vehicles
that reduce CO2 emissions and the automobiles dependency on
petroleum. In contrast to conventional vehicles and hybrids, GMs
E-Flex system uses an electric motor, powered by a lithium-ion
battery, to propel the Opel Flextreme concept for up to 55 km of
electric-drive-only range. A 1.3 turbo-diesel onboard engine
generates additional electricity to replenish the battery and extend
the vehicles driving range fully charged, the Flextremes 55-km
all-electric driving range is enough for most daily commuters in
Europe to travel without using any diesel fuel or emitting any CO2.
The Flextreme takes the new design language debuted in the GTC Coup
at the Geneva Motor Show several steps further. With the rear-hinged
back doors (FlexDoor) that enable comfortable access to the
interior, a large transparent roof and two tailgate doors that open
from the side and swing upwards (FlexLoad), the concept car
embodies Opels tradition of particularly flexible and practical
body concepts with attractive designs. This also includes the
FlexLoads additional underfloor luggage compartment the latest in a
series of innovative Opel solutions such as the Zafiras seating
system (Flex7) and the integrated rear carrier system FlexFix found
in the Corsa and Antara. And the big surprise is the integration of
two high-tech electric personal transporters, ingeniously packaged
below the cargo floor. They can be used in areas that cars cannot
enter, thereby adding an extra mobility option. The electric
scooters provide up to a 38 km (23 miles) of clean mobility.
For the IAA, FlexLoad carries special cargo in tune with the
Flextremes electric propulsion: electrically-powered Segway
Personal Transporters (PTs). These high-tech transportation devices
(1) have been modified for their mobile garage. With a twist of the
handlebar-mounted release, the handlebar telescopically retracts and
rotates downwards for easy loading into the Flexload compartment.
Once docked, the batteries of the Segways can be charged along with
the Flextremes batteries.
Propulsion: Low-emission mobility
with E-Flex technology
drivetrain is a good indication of what low-emission mobility could
look like in the mid-term. It is based on General Motors electric
vehicle architecture E-Flex and is always electrically powered. The
energy source is a lithium-ion battery, and additional energy comes
from a 1.3-liter CDTI engine as needed. This engine is not connected
to the wheels; it is only on board to charge the batteries when they
are empty and no plug-in facility is available, thereby extending
the operating range. The concept cars diesel engine features latest
technology that helps to further reduce exhaust and noise emissions.
The cylinders pressure-based closed loop technology is used to
control the combustion process. Based on the current European test
cycle for plug-in vehicles, the Flextreme is expected to emit less
than 40 g of C02 per km.(according to European test procedure ECE
R101 for range extender vehicles).
Plug-in full capacity after
three hours of charging at 220 volts
The E-Flex strategy is
based on combining various drivetrain systems in the same vehicle
architecture, depending on what energy source is readily available
in the drivers area. The concept has already been presented in two
further versions: at the Detroit Motor Show in January 2007, it
debuted with a 1.0-liter, three-cylinder turbo gasoline engine
designed for operation with gasoline or E85 (a mixture of 85 percent
ethanol and 15 percent gasoline). And at the Shanghai Motor Show in
April 2007, GM presented the electric concept car with hydrogen fuel
Exterior design: Dynamic design
language in compact monocab form
The Flextreme bodys key
characteristics highlight the new elements of Opel design language:
more sculpted surfacing molding, clear style elements such as
boomerang-shaped lights and sloping swage line in the side graphics.
The 4555 mm long Flextreme was also designed following the motto of
technological efficiency: vehicle weight and aerodynamics are
optimized by using advanced materials and simulation technology. The
result is a wide range of innovative solutions.
The bottom edge of the windshield has been pulled far forward, so
the hood with its characteristic crease is very short. The
integrated power socket in the cowl panel allows the car to be
charged at any mains supply.
A look at the front of the car quickly reveals that the front grill
and rims are covered by lightweight transparent trim, which is made
from polycarbonate to improve aerodynamics while maintaining visual
aesthetics. The same is true for the special light alloy wheels.
Their look remains unchanged, yet disruptive air turbulence is
Like the wheel design, the large boomerang-like curved front light
units are visually deceptive. The designers continue a theme which
began with the GTC Concept that debuted at the Geneva Motor Show,
and take it to a new level. The vertically oriented front lights
slice up the front end in an unusual manner. The boomerang shaped
high tech LED headlamp unit houses lightweight crossbeam, fog lamps
and air intake for brake cooling which are particularly small in
comparison to current trends. The optical illusion continues with
the tail lights: at first glance, the concept car appears to have
none. The curved rear lights are completely integrated into the
tailgates and hidden beneath glass.
Just like all the other windows and a large part of the roof, the
windshield is made of especially light polycarbonate. The
Flextremes panoramic windshield provides a light and spacious
interior ambience and stretches over most of the roof, which is
reinforced by a spine-like composite structure that extends all the
way to the rear floor.
Doors: Unconventional and
In keeping with the
vehicles extraordinary features, access to the FlexLoad luggage
compartment is through two butterfly rear tailgate doors that
individually swing open upwards along the central axis of the
vehicle. The advantage is that the Flextremes trunk is accessible
from the side when parked tightly against a wall or another vehicle.
Another key Flextreme innovation is the trademarked FlexDoors
driver and passenger doors: while the front doors open in the
conventional manner, the rear doors are
rear-hinged. And as there is no center roof pillar (B-pillar),
opening both doors on one side creates a large opening for easy
entry. The large side opening makes it much easier for parents to
secure children in seats in the rear than is the case with
Interior: Futuristic and top
which are characterized by low weight and high rigidity, are used
extensively in the Flextremes interior. This functional, geometric
structure can be found in the instrument panels lower portion,
cabin floor, cargo floor and above the center tunnel where the
lithium-ion batteries are located.
Innovative lightweight construction is used for the seats which are
anchored to the cars floor by a mono track rather than the usual
two, creating more foot space in the rear. The seats have a light
and elegant look thanks to refined upholstery, with some parts in
fabric/mesh and corners made of especially soft material. The
steering wheel hub also houses a high-tech feature: a full-size
driver airbag that is packaged with a special vacuum technique that
reduces its overall volume to the minimum.
Set directly under the windshield, the large panoramic display
(size: 1.20 m x 0.10 m) in the interior is especially eye-catching.
The display fields are configurable. They can show a complete
all-around view of the cars surroundings, for example, as instead
of exterior mirrors the Flextreme has two side cameras, one
front-facing and one rear-view camera. Alternatively the displays
can also show information about the car, radio, phone, etc.
One touch is enough
A second display on the
center console features touch-screen operation. At the top, the
programmable one-touch buttons are designed like computer shortcuts.
They provide easy access to various intuitive menus, including air
conditioning, communication/infotainment and navigation functions.
The buttons can be freely programmed and adapted to new infotainment
systems. Slightly further down is the Flextremes touch screen drive
selector gate with three driving positions: D, P and R (drive, park
and reverse). The gears can also be comfortably selected via touch
A clever storage system at the front and back of the center tunnel
offer brand-typical flexibility. Front and rear passengers can stow
items such as mobile phones, MP3 players, iPods and PDAs in two
drawers. The best part: the electrical devices are recharged in the
drawers by induction and Bluetooth-capable systems can transmit
their data to the onboard infotainment system.