Dynamo 7.0: Difference between revisions

DTU Dynamo 7.0
DTU Dynamo 7.0
	DTU Dynamo 7.0 at Shell Eco-Marathon 2011
Overview
Assembly	Kongens Lyngby, Denmark
Powertrain
Engine	49 cc single-cylinder 3 valve SOHC
Transmission	2-speed manual
Dimensions
Kerb weight	approx. 120 kg
Chronology
Predecessor	Dynamo 6.0
Successor	Dynamo 8.0

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Revision as of 16:27, 28 April 2012

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 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]

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.

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^[5]. 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.

**2011 Race results ^[5]**
Attempt number	Result [km/L]
1	338.3
2	428.3
3	457.5
4	473.5
5	509.4

References

^ "Engine description". DTU Roadrunners. Retrieved 2012-04-24.
^ "Worlds top eco-car wins using ethanol". Inbicon. Retrieved 2012-04-28.
^ "DTU rykker på bioethanol til dette års Shell Eco-marathon (English: DTU goes for bioethanol for this years version of the Shell Eco-marathon)". Ingeniøren (English: The News Magazine "The Engineer"). Retrieved 2012-04-28. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)
^ "DTU Roadrunners' økobil kørte længst på literen (English: DTU Roadrunners eco-car drove farthest to the litre)". DTUbroadcast. Retrieved 2012-04-28.
^ ^a ^b "Shell Eco-marathon Europe 2011 Final results : UrbanConcept Internal Combustion Engine" (PDF). Royal Dutch Shell. Retrieved 2012-04-24.

External links

[DTU_Roadrunners_webpage-1] "Engine description". DTU Roadrunners. Retrieved 2012-04-24.

[Inbicon_web_page-2] "Worlds top eco-car wins using ethanol". Inbicon. Retrieved 2012-04-28.

[Ingeniøren-3] "DTU rykker på bioethanol til dette års Shell Eco-marathon (English: DTU goes for bioethanol for this years version of the Shell Eco-marathon)". Ingeniøren (English: The News Magazine "The Engineer"). Retrieved 2012-04-28. {{cite web}}: Italic or bold markup not allowed in: |publisher= (help)

[DTU_Broadcast_video-4] "DTU Roadrunners' økobil kørte længst på literen (English: DTU Roadrunners eco-car drove farthest to the litre)". DTUbroadcast. Retrieved 2012-04-28.

[Shell_Eco-Marathon_2011_results_for_Urban_Concept,_Internal_Combustion-5] "Shell Eco-marathon Europe 2011 Final results : UrbanConcept Internal Combustion Engine" (PDF). Royal Dutch Shell. Retrieved 2012-04-24.

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@@ Line 33: / Line 33: @@
 ==Design and technology==
 ===Engine and drive train===
-A 49 cc [[Four-stroke engine|four-stroke]] [[Spark-ignition engine|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 <ref name="DTU Roadrunners webpage">{{cite web
+A 49 cc [[Four-stroke engine|four-stroke]] [[Spark-ignition engine|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.<ref name="DTU Roadrunners webpage">{{cite web
  | url=http://www.ecocar.mek.dtu.dk/Dynamo/Engine.aspx
  | title=Engine description
@@ Line 43: / Line 43: @@
  | publisher= Inbicon
  | accessdate=2012-04-28
-}}</ref>.
+}}</ref>
-For this purpose the [[engine control unit|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 <ref name="Ingeniøren">{{cite web
+For this purpose the [[engine control unit|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. <ref name="Ingeniøren">{{cite web
  | url=http://ing.dk/artikel/119235-dtu-rykker-paa-bioethanol-til-dette-aars-shell-eco-marathon
  | title= DTU rykker på bioethanol til dette års Shell Eco-marathon (English: ''DTU goes for bioethanol for this years version of the Shell Eco-marathon'')
  | publisher= [[Ingeniøren]] (English: ''The News Magazine "The Engineer"'')
  | accessdate=2012-04-28
-}}</ref>.
+}}</ref>
 {| class="wikitable"
@@ Line 65: / Line 65: @@
 |}
-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.
+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.<ref name="DTU Broadcast video">{{cite web
+ | url=http://www.youtube.com/watch?v=ChZkcKBmTmw&hd=1
+ | title=DTU Roadrunners' økobil kørte længst på literen (English: ''DTU Roadrunners eco-car drove farthest to the litre'')
+ | publisher= DTUbroadcast
+ | accessdate=2012-04-28
+}}</ref>
 ===Body and chassis===
@@ Line 75: / Line 80: @@
 ==Race Results==
-During the Shell Eco-marathon 2011 at [[EuroSpeedway Lausitz]]a total of five valid attempts were made<ref name="Shell Eco-Marathon 2011 results for Urban Concept, Internal Combustion">{{cite web
+During the Shell Eco-marathon 2011 at [[EuroSpeedway Lausitz]] a total of five valid attempts were made<ref name="Shell Eco-Marathon 2011 results for Urban Concept, Internal Combustion">{{cite web
  | url=http://www-static.shell.com/static/ecomarathon/downloads/2011/europe/results/Final_results_Europe_2011_UrbanConcept_Internal_Combustion_Engine.pdf
  | title=Shell Eco-marathon Europe 2011 Final results : UrbanConcept Internal Combustion Engine