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Old 03-29-2009, 02:04 AM   #131 (permalink)
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Originally Posted by Tygen1 View Post
Ok, I've been digging thru the net trying to find a BSFC for my car. I think I found one, and a wealth of knowledge from this MIT paper: http://dspace.mit.edu/bitstream/hand...pdf?sequence=1
It's 115 pages, so don't start it unless you got some time It's quite in depth and covers many effciency topics including EGR dilution, NoX reduction, Lean Burn and Hydrogen boosted Lean burn. Quite in depth.
The first chart is the baseline without any EGR function, the second is with 10% EGR dilution and the third is with the Hydrogen boosted Lean Burn.

Enjoy!!!
Thanks! My BSFC chart also came from MIT. Your paper references Rudy Smaling and Olivier Weck, who wrote this paper in 2004 :

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Originally Posted by cfg83 View Post
...
Here's one for my Saturn 1.9 liter DOHC engine :
...
I got it from here :

Fuzzy Pareto Frontiers in Multidisciplinary System Architecture Analysis
http://web.mit.edu/deweck/www/PDF_ar...-2004-4553.pdf
...
CarloSW2

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Old 03-29-2009, 04:16 PM   #132 (permalink)
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Still nothing for old-school Honda B-series engines...
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Old 04-06-2009, 07:46 AM   #133 (permalink)
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BSFC of the M271 Daimler Engine
Wiki english

Wiki German with more (german) information about the engine
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Old 04-07-2009, 10:16 AM   #134 (permalink)
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Hi,

I was surprised to find one of my charts in this thread so if there are any questions. As background, I have a Graham miniscanner that reports up to six data metrics in just over 1 second. There are nearly 100 metrics that can be chosen but only six recorded via the RS-232 line.

For these charts, I measured MG1 torque, which is 28% of the ICE torque. Combined with ICE rpm, I have the shaft power into the transaxle. For fuel flow, I can use either mass airflow or injector timing.

Initial Engine Efficiency Chart:

I prefer this chart because the small red bubbles do a better job of showing the peak efficiency region. It also includes the HP graph.

This is another look at similar data from a single fuel tank:


This is graph from one of the SAE papers on the Prius I was trying to replicate:


Data from another trip:


Now one of the Prius SAE papers on the Prius has this operational line:


So I made a variation of that chart:

This chart is a little easier to deal with because it uses engine RPM as the X-axis and the expected torque. Understand this is more of a model chart versus the earlier measured charts.

Bob Wilson

* - SAE 2004-01-0064 - "Development of New-Generation Hybrid
System THS II - Drastic Improvement of Power Performance and Fuel Economy", Koichiro Muta, Makoto Yamazaki and Junji Tokieda
Toyota Motor Corp. Reprinted From: Advanced Hybrid Vehicle Powertrains 2004 (SP-1833) 2004 SAE World Congress Detroit, Michigan March 8-11, 2004
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Old 04-07-2009, 12:14 PM   #135 (permalink)
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14 pages is wayy too much to look through and I don't understand all these graphs so I give up?
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Old 04-07-2009, 12:39 PM   #136 (permalink)
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Drive Stick -

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14 pages is wayy too much to look through and I don't understand all these graphs so I give up?
Yes, this is a clearinghouse thread. I would only read the first page to see if it whets your appetite. If yes, then go and find out more about BSFC. They made a lot of Neons, so I gotta think there's a BSFC for one "out there" in the web.

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Old 06-05-2009, 05:33 PM   #137 (permalink)
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I got the 2ZR-FXE (2010 Prius) engine's BSFC map off priuschat. It also shows a comparison to the 1NZ-FXE (04-09 Prius) engine.




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Old 06-05-2009, 11:22 PM   #138 (permalink)
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Hi,

I would like to add a few details. The BSFC charts come from an excellent SAE paper, "Development of New 1.8-Liter Engine for Hybrid Vehicles", Kawamoto, Naiki, Kawai, Shikida, Tomatsuri, SAE 2009-01-1061. It costs $15 to download a copy and I would recommend it ... a great read.

Now I have an NHW11 (2003 Prius) with a Graham scanner. This allowed me to plot the operational BSFC data, what happens in the real world, and compare it to the 'full throttle' BSFC chart:


After rescaling the rpm X-axis to align the rpm scale, I drew vertical lines bounding the peak BSFC region and passing vertical. You can quickly see that the field measured, peak BSFC region, the small red dots, occur at lower rpms than the 'maximum throttle' region. This also corresponds to ad hoc reports of the target rpms for P&G drivers who consistently reported peak or target rpms less than the paper's BSFC chart.

My hypothesis is the 1.8L engine is using a more aggressive intake valve cycle (i.e., later closing) to further off-load some of the partial throttle operation. By further delaying the intake closing, a smaller charge is in the cylinder for low power operation without the traditional pumping losses of partial throttle operation. The smaller charge takes less energy to compress but the 13-to-1 expansion remains. But this is not evident in the 'full throttle' BSFC chart. In contrast, the existing 1.5L drivers are using or stretching the longest intake valve closing to achieve a peak BSFC that is better than the SAE paper would suggest.

Seriously, I would recommend reading the SAE paper and the companion, "Development of New Hybrid Transmission for Compact-Class Vehicles", Mizuno, Ibaraki, Kondo, Odaka, Watanabe, Mizutani, Kaneshige and Kitada, SAE 2009-01-0726. This paper discusses the very efficient transaxle that has significantly reduced rolling drag. I have been very pleasantly surprised that when I shift into "N" you can feel the ZVH30 (2010 Prius) 'release' in forward roll. Compared to my NHW11 (2001-03 Prius,) it is brilliant. For example, reduction in lubrication stirring losses.

If you'd like to see the logical conclusion of advanced valve timing, the paper "Newly Developed Inline 4 AR Series SI Engine", Tsuchiya, Hosoi, Hoshi, Shimamura, Hagiwara, Ito and Ari, SAE 2009-01-1048. Ultimately, the throttle plate goes away.

Bob Wilson
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Old 06-10-2009, 01:59 PM   #139 (permalink)
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A wiki page has been added to store the BSFC maps we find. If we missed any, fix it or let us know so we can add them.

Brake Specific Fuel Consumption (BSFC) Maps - EcoModder
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Old 06-10-2009, 06:48 PM   #140 (permalink)
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NICE. Thanks, almighty moderators. Wiki-ing this stuff is a great move. That's what makes EM the best... unless someone else did it first. Awesome work.

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