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IUT Ville d'Avray (France)
2010 participation report and 2011 project presentation
second participation in "all electric" class, second first prize!
From the 16th to 19th of May on the Nogaro race track (France), our Institute of Technology (Institut Universitaire de Technologie) of Ville d'Avray (near Paris), with the participation of students, teachers and technicians, took part in the Challenge Educ-Eco, the first French mileage competition which replaced the European Shell Eco-marathon on this track.
In 2009, for our first competition in the "all electric" class, we won the 1st prize by consuming the equivalent electrical energy of a 2-minute use of a hair-dryer to cover 25 km. We reached the 2nd rank in the group "electric motor vehicle" ("solar" + "all electric" vehicle), at only 8% more consumed energy, behind the officious long-time-participating "European champions". We were also ranked 9th in the "thermal engine" class.
In 2010, for our second competition in the "all electric" class, we won the 1st prize as well as in the "all electric + solar" super class with consumption data very close to the 2009 result. It seemed to be the best 2010 world performance for electric car consumption providing the energy-meter indication was as precise as the ones used in the other competitions.
We enrolled a new solar car in the competition but, due to a lack of rigidity of the rear chassis, we didn't succeed in ranking our vehicle.
We are satisfied with our success in electric propulsion class but disappointed with our failure in solar propulsion class. It will be much better in 2011!
Here, we wish to thank all the people who contributed to this achievement : students, technicians, teachers, consultants as well as the sponsors who supported us and on whom we rely for next year competition.
Pierre Rochelle, Bernard Toupin and Louis Fourdan
2010 Vehicles technical data
"all electric" (plug-in) vehicle
EcoCar5E (n°29)
-wheel motorized single-seater:
overall dimensions (L*w*h in meter) and weigth : 2,83*0,78*0,65 , 55kg
Engine, Transmission :
Electric brushless motor Dualsky XM6360-CA12 :
- 24V DC supply (2*12V-12Ah Yuasa batteries)
- modified Honda GX35 centrifugal clutch, fitted to the 8mm motor axle
- 50A continuous rating controller, with 70A of short-time top intensity
- 1-stage transmission with 12/139 ratio, 8mm pitch chain, chain tensioning at rest done by engine tilting with use of a tensioner
Rear axle :
- Hope hub with 2-pawl free-wheel, softened pawl springs, reduced ratchet-teeth number, left-side drive
- 20" spoked wheels with low-friction ball bearings,
- 1 Magura hydraulic rim brake,
- low friction Michelin tire
Front axle and steering :
- steering gear with Jeantaud/Ackermann links geometry, equipped with adjustable ball joints (adjustment of toe in/toe out and steering arm length)
- tilting steering column with a false universal-joint, to ease pilot seating and extraction
- 20" spoked wheels with low-friction ball bearings, Hope hubs with 12mm cantilever axle
- 2 mechanical disk brakes, 160mm disk diameter
- low friction tires
Chassis frames :
- main chassis made of 1/2" composite board (fibreglass/epoxy skin and aluminium honeycomb), structural fireguard wall made of 1/2" composite board (aluminium skin and aluminium honeycomb)
- rear chassis made of square aluminium tubes (20mm*20mm), assembled by pasted and riveted plates, + motor support tilting arm and adjustable ball joints
Controls and indicators :
- 1 Magura MTB brake handle for the rear hydraulic brake + 1 brake pedal for the MTB mechanically actuated front brakes (cables and brake balance-lever)
- 2 push buttons : starter, horn
- 1 in-line potentiometer as "gas handle" with cut off at the low-resistance end
- 2 switches : 1 for pre-start and 1 for ignition "switch on", with a test lamp
- 1 bicycle counter/computer for the display of elapsed time since start, instantaneous speed and covered distance
Other mandatory equipments :
- 12V approved horn with a dedicated battery
- approved 1kg fire extinguisher
- approved 5 anchor-point security belt
- 2 adjustable rear mirrors
non mandatory equipment
hands-free VHF/UHF radiotelephone or cellular phone
Stream-lined body (2 parts), with a completely removable upper part :
- lower body shell made of fiberglass and polyester
- upper body shell made of fiberglass and polyester, with a 1mm polycarbonate glazing
- for the race, centering pins and elastic bands are used to assemble the 2 body part
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"solar electric" vehicle
EcoCar7S (n°30)
3-wheel motorized single-seater:
overall dimensions (L*w*h in meter) and weigth : 2,87*0,66*0,63, 50kg
Engine, Transmission :
Electric brushless motor Scorpion 5525 special :
- 36V DC supply (3*12V-12Ah Yuasa Pb batteries)
- modified Honda GX35 centrifugal clutch, fitted to the 8mm motor axle
- 50A continuous rating controller, with 70A of short-time top intensity
- 3*45W-12V solar units with mono-crystal silicium cells
- 1-stage transmission with 8mm-pitch chain, chain tensioning at rest done by engine tilting with use of a tensioner
Rear axle and steering :
- propulsive rear wheel + motor tilting support + setting arm with adjustable ball joints on a steering fork made of 20*40mm aluminium tubes
- lateral tilting steering levers and aluminium command tubes with ball joints, to ease pilot seating and extraction
- Hope hub with 2-pawl free-wheel, softened pawl springs, reduced ratchet-teeth number, left-side drive
- 20" spoked wheel with low-friction ball bearings,
- 1 Magura hydraulic rim brake,
- low friction Michelin tire
Front axle :
- 20" spoked wheels with low-friction ball bearings, 2 Hope hubs with fixed 12mm cantilever axle
- 2 Magura half hydraulic rim brakes
- low friction Michelin tires
Chassis frames :
- main chassis made of 12mm composite board (carbon/epoxy skin and plastic honeycomb),
- front wheel support frame made of square aluminium tubes (25mm*50mm)
- structural fireguard frame made of square aluminium tubes (25mm*50mm), it composes a cage with the front frame to support the sliding solar panel
- rear chassis made of square aluminium tubes (25mm*50mm), assembled by pasted and riveted plates, to support the directional fork and motor
Controls and indicators :
- 2 Magura MTB brake handles for the rear and front hydraulic brakes
- 1 push button : for horn
- 1 rotary potentiometer as "gas handle" with cut off at the low-resistance end
- 3 switches : 1 for main, 1 for pre-start and 1 for motor "switch on"
- 1 bicycle counter/computer for the display of elapsed time since start, instantaneous speed and covered distance
Other mandatory equipments :
- 12V approved horn with a dedicated battery
- approved 1kg fire extinguisher
- approved 5 anchor-point security belt
- 2 adjustable rear mirrors
non mandatory equipments
- 1 hand-free VHF/UHF radiotelephone or cellular phone
- 1 motor data logger
Stream-lined body (2 parts), with a completely on-demand removable upper part :
- lower body shell made of carbon fabric and epoxy
- upper body shell made of carbon fabric and epoxy, with a 1mm polycarbonate glazing
- for the race, centering pins are used to assemble the 2 body parts
- the upper sliding solar panel provides the pilot exit
budget and partnership
Usually we needed a 6000 to 7500€ budget to cover the expenses due to vehicle construction or improvements, logistics (for the Nogaro competition) and university environment fees. This year 2010, our budget had to be of the same level to take part to the Challenge EducEco and largely higher (10000€ or more) if we would have wanted to participate to the European Shell Eco-marathon competition in Lausitz (Germany), for which we were selected. As the Crisis went on and our time schedule filled up, we limited our participation to the sole Challenge EducEco (in the south of France). In 2011, it is obvious that this project will require more resources : both human means and financial means ; we shall be led to ask help from our old partners who, so we hope, will put trust in us again, but also new ones, especially in the new technology area. The next budget should be approximately of 12000€, at a minimum, to enter the 2 competitions and improve the existing vehicles.
So as to give more flexibility to the management of our finances and a larger area to our activities, we have created a dedicated private association, the ADVEVA.
Public partners :
'Génie Thermique et Energie' department of the Institute of Technology of Ville d'Avray (IUT Ville d'Avray)
IUT de Ville d'Avray
Université Paris-Ouest Nanterre
Private company or local community partners :
Ville d'Avray town council
SMPF (mechanical manufacture company)
SNR
HPC
Abside
Hope, ...
Individual partners :
Louis Fourdan, Dualsky company consultant
2011 projects :
improvements and optimizations, more participations to international races
the year 2009 and 2010 results incite us to enlarge our objectives by planning the participations to the European Shell Eco-marathon (Lausitz, Germany) in the "solar vehicle" and "plug-in vehicle" classes and to the Challenge EducEco (Nogaro, France) in the same classes with, this time, 2 dedicated vehicles. The optimization of the existing vehicles is planned ; ideas are already bubbling.
the work to come on one or the two vehicles
weigth reduction of the chassis and the body
improvement of the rear wheel steering system
improvement of the braking system
improvement of the motor (clutch, electronic control,...)
optimization of the transmission ratio
improvement of the electric circuitry
improvement of the solar energy collection and management
improvement of the cockpit ergonomics
improvement of the wireless communication (VHF radio, telemetry)
optimization of the race strategy and energy use
introduction of a dedicated data logger (motor+GPS)
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