Citroen Tests World’s First Hybrid World Rally Car
Citroen Tests The World’s First Hybrid World Rally Car
Citroen Racing
have started testing its Citroen C4 WRC Hybrid World Rally
Car, proving that its technological showcase is much more
than just a motor show star and that it is paving the way
for low consumption, low emission, low noise motor sport
cars of the future.
Just hours after winning its four World Rally Championship event of the season, Citroen Racing took the new car testing in Portugal using tarmac roads near Faro with Citroen’s Spanish driver, Dani Sordo, behind the wheel
First seen at the Paris and then Bologna and Geneva Motorshows, the Citroën C4 WRC HYbrid4 made its debut on the road in Finland before that country’s WRC round in a slow speed demonstration, but the Faro test was the first at rally speeds and under rally conditions.
The Citroën
C4 WRC HYbrid4 was developed using Citroën’s current
World Rally Championship contender as a base. An electrical
propulsion system has been added to the internal combustion
engine, gearbox, and transmission that are specific to the
WRC machine.
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The addition of a 990¬cell Ion
Lithium battery on top of the petrol tank and a 125 kW
electric motor driving the rear wheels puts an extra 150 kg
onto the overall weight.
“This system, developed by Citroën Racing, allows the driver to choose between four different modes of functionality,” explains Didier Clement, one of the race engineers behind the project. “In internal combustion mode, the Citroën C4 WRC HYbrid4 behaves exactly like one of the C4 WRC cars that compete on the World Rally Championship. In internal combustion mode with energy recovery switched on, braking endurance is improved and the batteries get charged. On road sections and in the service park, electric mode with energy recovery means that there is less nuisance, increased range and less wear on the conventional engine. Finally, boost mode – which employs both the internal combustion engine and the electric motor – gives an extra 300 Nm of torque when engaged.”
The two engines are linked to the same
drivetrain. The driver can choose electric mode simply by
switching on the ignition without starting the internal
combustion engine. The gearbox paddles then give him a
choice of three settings: forwards, backwards and neutral.
Didier Raso, an electrical and systems engineer,
comments:
“The objective with this project was to be
able to use the electric motor to drive on some of the road
sections. This fully operational concept responds to that
design brief. Citroën Racing wanted to show its ability
to adapt this technology to motorsport. If at any point in
the future the regulations permit the use of hybrid
technology, we will be able to react straight away.”
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During the test session, Citroën Total World Rally
Team driver Dani Sordo was able to evaluate the dynamic
properties of the C4 WRC HYbrid4. One of the highlights of
the day was a road section that passed through the village
of Barranco do Velho, which was of course open to normal
traffic. This allowed the team to assess the advantages of
zero emissions in a life¬sized context.
The second part of the test was a somewhat more familiar territory for Citroën Racing’s development team: a narrow and twisty asphalt road, not at all dissimilar to many of the demanding stages seen on the World Rally Championship.
Following the three challenging days of Rally Portugal, which resulted in a third place for Dani Sordo, the young Spaniard looked forward to his latest task with enthusiasm.
“In
electric mode, you can drive through villages without making
the slightest noise, which is very unusual for a competition
car,” he reported during the hybrid car’s test.
“It’s better for the environment and also more
comfortable for the crew, making road sections more
pleasant.”
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Sordo’s comments on the car’s
pure performance were equally complimentary.
“On the
stages, I would say that the overall behaviour of the car is
slightly different to that of the C4 WRC, with more weight
to the rear,” he reported after his first few flying
kilometres in internal combustion mode. “The boost
function means that we can choose when to benefit from extra
torque under acceleration. When it comes in, the effect is
very impressive!”
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Just as is the case on the C4
WRC, the car set¬up and tyre choice allow the driver to
fine¬tune the handling.
“The feeling is on the whole
the same as the one I have with the standard rally car,”
added Sordo. “And I love the way that the C4 goes on
asphalt!”
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Throughout this test session, which
well and truly underlined the creativity of Citroën
Racing, the Citroën C4 WRC HYbrid4 demonstrated all the
credentials that make it an important technological advance
in rallying. Driving a C4 HYbrid4 that nonetheless has
several things in common with his usual car, Dani Sordo
successfully completed a fruitful test in which several
valuable lessons were learned for the
future.
(ends)