BSFC Maps 1

[samkberry]

Hi there all,
I am developing a vehicle simulation library which includes calculations on fuel economy, using data obtained from specific fuel consumption maps. Although plenty of maps are publicly available (in image form) on the internet they tend to be:

- too old, often from engines with emissions and power outputs which do not represent modern designs/calibrations
- not from identified and verified sources, with no information about intake temp / ancillaries etc..
- poor resolution hampering digitisation

I am looking for a small handful of up-to-date maps, preferably from a proper source such as a published journal paper. Being in Europe, of particular interest are small common-rail turbo diesels (Euro 5/6) and modern downsized turbo-direct-injection petrols (gasoline). A heavy duty diesel map or two would be useful too. Tier2bin5 engines would also be acceptable.

Does anyone know of where I should be looking? I don't have free access to journals, but would be willing to buy a couple of specific papers if they have the information I need. Any information on motored friction (FMEP) vs speed would also be very useful if anyone has any ideas. This is necessary for motored torque and no-load fueling estimations.

Many thanks,
Sam Berry

 

[Lou Scannon]

Try searching papers at sae.org

"Schiefgehen will, was schiefgehen kann" - das Murphygesetz

 

[samkberry]

Thank you for your suggestion, hemi, but the problem is that I can only view the abstracts. I'd have to buy each paper of interest in the hope that it might contain the data I'm looking for, and that the data is of sufficient quality.

If I had free access to all papers I'm sure I could find enough information given time, but alas I don't!

Can you suggest any authors I should look for if I did go down this route?

 

[Lou Scannon]

The problem is, this kind of information is not cheap to generate, so it is not cheap to obtain second hand, at least in up-to-date form. The really good stuff is IP of the leading manufacturers, and will not see the light of day until it is no longer considered IP.
Your best bet for free information is public domain sources, such as EPA, DOE, etc, however, their ivory tower sources tend to be a little bit removed from the real world.

"Schiefgehen will, was schiefgehen kann" - das Murphygesetz

 

[samkberry]

Thanks again hemi. I agree with your points, but I was hoping that given the number of publicly available, up-to-date maps, particularly from VW, there may be a treasure trove of maps available somewhere... perhaps SAE as you say. Having spent a while looking at SAE previews today, I've found several sources on friction, but fewer maps than I found with a google search.

I overestimated the number of papers the Ricardos, Mahles, Delphis, Densos etc of the world had published on standard combustion engines.

 

[TStaples]

Sam,
Hemi is correct. The most recent data on today's state of the art engines is expensive to generate, and not very easy to obtain publicly. However, one of the best places to search, and you will have to do some data mining for sure, is the proceedings from the DEER (Directions in Engine-Efficiency and Emissions Research)conferences. Google "DEER conference proceedings" and pick the first link at energy.gov. They do a nice job of keeping all of the conference presentations in .pdf format. You will have to wade through quite a bit of material, but I know you will find some modern engine/combustion system BSFC charts, and lots of other interesting info too.

 

[samkberry]

TStaples, a lot to go through but there's certainly a lot of relevant stuff there. Thanks for the tip.

 

[turbomotor]

Sam,

The ecomodder web site has some bsfc maps, but I am guessing that you have already looked at these.

Dick Vincent

http://ecomodder.com/

 

[tbuelna]

Try contacting government agencies like the US DOT. They pay companies lots of taxpayer dollars to do research work on things like engine performance, and in return they get lots of data like SFC maps. If you can convince them that the data will be used for academic purposes, they usually will provide it to you since the research work was paid for with public money.

 

[samkberry]

Hi everybody,

Since I prefer threads with some closure, even if it's a little delayed, I thought I'd write down what I managed to find.

The DEER conference proceedings were a great resource... just not for BSFC maps. Lots to learn there though. The one map I did find (GM/Fiat 1.9 diesel) didn't survive sanity checks and so was of no use, unfortunately.

I managed to find a couple of SAE papers. One described a Ford 6.7L V8 engine. Great paper with excellent BSFC and NOx maps. The other represented an unlabelled engine with normalised axes, but the shape restricted it to one engine option (a GM 2.0L diesel), and so it was of some use.

The biggest resource was the German magazine MTZ / ATZ. Mercedes and VW published many BSFC maps in this magazine over the last decade, and the majority appears to be good quality. This includes 2.0L diesels, 1.4L downsized petrols, and a couple of V6s.

A last few were found from Google Books, although of older engines.

It would appear that the Aachen Colloquium, and similar conferences are *the* place to get OEM data like this, but only a small amount is publicly available. On the plus side I now have enough reliable data to determine trends and patterns, which was half the point.

Thank you all for your help!

 

[gruntguru]

Congrats and thanks for keeping us updated. I have often bemoaned the lack of access to BSFC maps. If nothing else, they would help those so inclined, to drive more economically. The map certainly indicates the optimum rpm band - getting the load right is a bit more tricky for most drivers. A manifold vacuum plot overlaid would help (plus a vacuum gauge n the car of course).

Any chance you can put the maps you have found somewhere public? I for one would love to have access to such a resource. Cheers.

je suis charlie