| DTU Dynamo 7.0 | |
| Assembly: | Kongens Lyngby, Denmark |
| Predecessor: | Dynamo 6.0 |
| Successor: | Dynamo 8.0 |
| Engine: | 49 cm3 single-cylinder 3 valve SOHC |
| Transmission: | 2-speed manual |
| Weight: | approx. 120 kg |
| Sp: | uk |
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.
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.
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]
| Gasoline | Ethanol | ||
|---|---|---|---|
| Power [kW] | 1.8 @ 5500 rpm | 2.0 @ 6000 rpm | |
| Torque [Nm] | 3.4 @ 4000 rpm | 3.5 @ 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]
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.
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]
| Attempt number | Result [km/L] | |
|---|---|---|
| 1 | 338.3 | |
| 2 | 428.3 | |
| 3 | 457.5 | |
| 4 | 473.5 | |
| 5 | 509.4 |