Dynamo 7.0

The Dynamo 7.0 is the seventh generation car run by DTU Roadrunners to compete in the Urban Concept class in the Shell Eco-marathon Europe. The car is developed by students at the Technical University of Denmark with the single purpose of achieving the best fuel economy as possible.

DTU Dynamo 7.0
Overview
AssemblyKongens Lyngby, Denmark
Powertrain
Engine49 cm3 single-cylinder 3 valve SOHC
Transmission2-speed manual
Dimensions
Kerb weightapprox. 120 kg
Chronology
PredecessorDynamo 6.0
SuccessorDynamo 8.0

The Dynamo 7.0 features a 49 cm3 moped engine run on second generation second generation bioethanol.

In the 2011 Shell Eco-marathon Europe the Dynamo 7.0 achieved a record of 509.4 km/L (gasoline equivalent) at the EuroSpeedway Lausitz racetrack, placing it first in the category of Urban Concept cars with internal combustion engines.

Design and technology

Engine and drive train

A 49 cc four-stroke spark ignited engine originating from a high-end moped is powering the Dynamo 7.0. The engine was in its originally application running on gasoline but has been modified to run on ethanol as a green alternative.[1][2] For this purpose the engine control unit (ECU) had to be replaced by a custom programmable ECU developed by students participating in the project. The programmable ECU enables user control of the air–fuel ratio. During a race the engine is run with a lean mixture to optimize fuel efficiency resulting in a thermal efficiency of approximately 30 percent.[3]

Engine performance
Gasoline Ethanol
Power [kW] 1.8 @ 5500 rpm2.0 @ 6000 rpm
Torque [Nm] 3.4 @ 4000 rpm3.5 @ 4000 rpm

The car has only one wheel drive, meaning the engine transfers the torque to the rear right wheel. Torque is transferred to the wheel through a 2-speed manual transmission with an automatic dry clutch.[4]

Body and chassis

The car is made with separate chassis and bodywork. The aluminium chassis features double wishbone-style suspension. The suspension has no dampers and only act as linkage between the vehicle and the wheel enabling adjustments of ride height, camber and toe.[5]

The body is made from carbon-fiber-reinforced polymer. It carries no structural loads and acts only as a housing guiding the air around the car. The aerodynamics of an eco-marathon challenger is a key parameter to optimize fuel efficiency. Therefore a spoiler was installed subsequently to improve the initial design which suffered from a somewhat high drag coefficient. The body is equipped with LED indicator, head- and rear light.

The car is capable of carrying only the driver together with a suitcase-like object stored in the engine compartment.

Race results

During the Shell Eco-marathon 2011 at EuroSpeedway Lausitz a total of five valid attempts were made.[6] In each attempts improvement in fuel economy was made. This was achieved by optimizing several settings in the car including gear-ratio, fuel amount regulation, clutch engagement and aerodynamics.[7]

2011 Race results [6]
Attempt numberResult [km/L]
1338.3
2428.3
3457.5
4473.5
5509.4

References
  1. "Ecocar.dk: Engine description". Technical University of Denmark. Archived from the original on 2012-12-17. Retrieved 2012-04-28.
  2. "Worlds top eco-car wins using ethanol". Inbicon. Archived from the original on 2011-11-27. Retrieved 2012-04-28.
  3. "DTU rykker på bioethanol til dette års Shell Eco-marathon (English: DTU goes for bioethanol for this year's version of the Shell Eco-marathon)". Ingeniøren (English: The News Magazine "The Engineer"). Retrieved 2012-04-28.
  4. "DTU Roadrunners' økobil kørte længst på literen (English: DTU Roadrunners eco-car drove farthest to the litre)". DTUbroadcast. Retrieved 2012-04-28.
  5. "Ecocar.dk: Steering and suspension". Technical University of Denmark. Archived from the original on 2012-12-17. Retrieved 2012-04-28.
  6. "Shell Eco-marathon Europe 2011 Final results : UrbanConcept Internal Combustion Engine" (PDF). Royal Dutch Shell. Archived from the original (PDF) on 2012-09-27. Retrieved 2012-04-24.
  7. "Ecocar.dk: Achievements 2011". Technical University of Denmark. Archived from the original on 2012-12-17. Retrieved 2012-04-28.
  1. http://ecocar.dk/
  2. https://web.archive.org/web/20120502114924/http://www.shell.com/home/content/ecomarathon/europe/
  3. http://www.dtu.dk/Nyheder/Nyt_fra_DTU/Arkiv.aspx?guid={C7C67F81-A33E-4DE6-AC93-53E4404167CE}
  4. http://www.dtu.dk/Nyheder/Nyt_fra_DTU/Arkiv.aspx?guid={0E739C57-8E34-435E-9ABF-4C0EEF31F859}
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