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A consumption map or efficiency map^[1] is a chart that displays the brake-specific fuel consumption of an internal combustion engine at a given rotational speed and mean effective pressure, in grams per kilowatt-hour (g/kWh).

The map contains each possible condition combining rotational speed and mean effective pressure. The contour lines show brake-specific fuel consumption, indicating the areas of the speed/load regime where an engine is more or less efficient.

A typical rotation power output, P (linear to $p_{e}\cdot \omega$ ), is reached on multiple locations on the map that differ in the amount of fuel consumption. Automatic transmissions are therefore designed to keep the engine at the speed with the lowest possible fuel consumption for a given power output under standard driving conditions.

Overall thermal efficiency can depend on the fuel used; diesel and gasoline engines can reach up to 210 g/kWh and about 40% efficiency. Natural gas can yield an overall efficiency of about 200 g/kWh.^[2] Average fuel consumption values are 160–180 g/kWh for slower two-stroke diesel cargo ship engines using fuel oil, reaching up to 55% efficiency at 300 rpm; 195–210 g/kWh for turbodiesel passenger cars; 195–225 g/kWh for trucks; and 250–350 g/kWh for naturally aspirated Otto cycle gasoline passenger cars.^[3]

Literature

(German) Richard van Basshuysen: Handbuch Verbrennungsmotor, Fred Schäfer; 3. Auflage; 2005; Vieweg Verlag

References

^ Dieter Lohse und Werner Schnabel: Grundlagen der Straßenverkehrstechnik und der Verkehrsplanung: Band 1, Beuth Verlag, 2011, ISBN 9783410172710.
^ Rainer Golloch, Downsizing bei Dieselmotoren, Abschnitt 2.1.3 Verbrennung, 1.
^ Table 1 in Konrad Reif, "Dieselmotor-Management im Überblick", Abschnitt Springer Fachmedien Wiesbaden 2014, ISBN 978-3-658-06554-6

[1] Dieter Lohse und Werner Schnabel: Grundlagen der Straßenverkehrstechnik und der Verkehrsplanung: Band 1, Beuth Verlag, 2011, ISBN 9783410172710.

[2] Rainer Golloch, Downsizing bei Dieselmotoren, Abschnitt 2.1.3 Verbrennung, 1.

[3] Table 1 in Konrad Reif, "Dieselmotor-Management im Überblick", Abschnitt Springer Fachmedien Wiesbaden 2014, ISBN 978-3-658-06554-6

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-[[File:Brake_specific_fuel_consumption.svg|right|thumb|290x290px|Consumption map of a three cyllinder diesel engine, capacity1.5 l]]
+[[File:Brake_specific_fuel_consumption.svg|thumb|330x330px|Consumption map of a 1.5-[[litre]] three-cylinder diesel engine]]
-The '''consumption map''' or '''efficiency map'''<ref>Dieter Lohse und Werner Schnabel: [http://books.google.de/books?id=QAGHZPVnnSAC&pg=PA540 ''Grundlagen der Straßenverkehrstechnik und der Verkehrsplanung: Band 1''], Beuth Verlag, 2011, [[:de:Special:BookSources/9783410172710|ISBN 9783410172710]].</ref> shows the [[Brake specific fuel consumption|brake specific fuel consumptio]][[Brake specific fuel consumption|n]] in g per kWh over [[mean effective pressure]] per [[rotational speed]] of a [[Internal combustion engine|combustion engine]].
+A '''consumption map''' or '''efficiency map'''<ref>[https://books.google.com/books?id=QAGHZPVnnSAC&pg=PA540 Dieter Lohse und Werner Schnabel: ''Grundlagen der Straßenverkehrstechnik und der Verkehrsplanung: Band 1''], Beuth Verlag, 2011, {{ISBN|9783410172710}}.</ref> is a [[chart]] that displays the [[brake-specific fuel consumption]] of an [[internal combustion engine]] at a given [[Rotational frequency|rotational speed]] and [[mean effective pressure]], in [[Gram|grams]] per [[kilowatt-hour]] (g/kWh).
+The map contains each possible condition combining rotational speed and mean effective pressure. The [[contour line]]s show brake-specific fuel consumption, indicating the areas of the speed/load regime where an engine is more or less efficient.
-On the abscissa it shows the [[rotational speed]] range. The [[Cartesian coordinate system|ordinate]] is limited by the maximum load of the engine. The lines show the specific fuel consumtion and appear similar to a shell.
-The map contains each possible condition, combining rotational speed mean effective pressure. It shows the result of specific fuel consumption. A typical rotation power output '''P''' (linear to <math>p_{e} \cdot \omega</math> ) is reached on several locations on the map but differing in the amount of fuel consumption. [[Automatic transmission]]<nowiki/>s, are designed to keep the engine in the lowest possible fuel consumtion mode.
+A typical rotation power output, '''P''' (linear to <math>p_{e} \cdot \omega</math>), is reached on multiple locations on the map that differ in the amount of fuel consumption. [[Automatic transmission]]s are therefore designed to keep the engine at the speed with the lowest possible fuel consumption for a given power output under standard driving conditions.
-The map also shows the effiency of the engine. Depending on the fuel type, [[diesel]] and [[gasoline]] engines reach up to 210 g per kWh and about 40 % of efficiency. Using [[natural gas]] this efficiency is reached at 200 g per kWh.<ref>Rainer Golloch, "''Downsizing bei Dieselmotoren''", Abschnitt ''2.1.3 Verbrennung'', 1. </ref>
+Overall [[thermal efficiency]] can depend on the fuel used; [[Diesel fuel|diesel]] and [[gasoline]] engines can reach up to 210&nbsp;g/kWh and about 40% efficiency. [[Natural gas vehicle|Natural gas]] can yield an overall efficiency of about 200&nbsp;g/kWh.<ref>Rainer Golloch, ''Downsizing bei Dieselmotoren'', Abschnitt ''2.1.3 Verbrennung'', 1.</ref> Average fuel consumption values are 160–180&nbsp;g/kWh for slower [[Two-stroke engine|two-stroke]] diesel [[cargo ship]] engines using [[fuel oil]], reaching up to 55% efficiency at 300&nbsp;rpm; 195–210&nbsp;g/kWh for [[Turbo-diesel|turbodiesel]] passenger cars; 195–225&nbsp;g/kWh for trucks; and 250–350&nbsp;g/kWh for [[Naturally aspirated engine|naturally aspirated]] [[Otto cycle]] [[Petrol engine|gasoline]] passenger cars.<ref>Table 1 in Konrad Reif, "''Dieselmotor-Management im Überblick''", Abschnitt  Springer Fachmedien Wiesbaden 2014, {{ISBN|978-3-658-06554-6}}</ref>
-Average values<ref>Table 1 in Konrad Reif, "''Dieselmotor-Management im Überblick''", Abschnitt  Springer Fachmedien Wiesbaden 2014, [[:de:Special:BookSources/9783658065546|ISBN 978-3-658-06554-6]]</ref> are 160 to 180 g per kWh for slow moving [[two stroke]] diesel boat engines using [[fuel oil]], reaching up to 55 % efficiency at 300 rpm. 210 to 195 g per kWh at cooled and pre [[Turbocharger|charged]] diesel engines for passenger cars, trucks 225 to 195 g per kWh. Non charged [[otto cycle]] gasoline engines for passenger cars 350 to 250 g per kWh.
 == Literature ==