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Old 04-30-2014, 10:48 PM   #1 (permalink)
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Toyota makes new EV engine

More info here: Toyota Designs New Type Of Internal Combustion Engine For Extended-Range EVs


Last edited by gone-ot; 04-30-2014 at 11:54 PM..
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Old 04-30-2014, 11:18 PM   #2 (permalink)
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Lots of goodness there- hopefully it gets realized.
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Old 04-30-2014, 11:32 PM   #3 (permalink)
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Very cool
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Old 05-01-2014, 08:13 AM   #4 (permalink)
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Green Car Congress: DLR team develops demonstrator of free-piston linear generator as range extender for EVs; technology transfer to Universal Motor Corp.

Interesting comments, free piston engines are not "new" technology. The INNAS design predates Toyota by at least 4 years.

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Old 05-01-2014, 08:18 AM   #5 (permalink)
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Posted on this site in late 2011. There are probably older posts here. Supposedly 56% thermal efficiency.

http://ecomodder.com/forum/showthrea...l-18815-3.html

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Old 05-01-2014, 08:20 AM   #6 (permalink)
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Also, OMG, it's a two stroke. That should bring on a fiery debate, something I have been advocating for a decade.

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Old 05-01-2014, 08:46 AM   #7 (permalink)
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I think ring reliability is a problem with two strokes but there's no reason you can't pair up pistons and have a 4 stroke version of this. The potential problem area I see is the magnet, which would be undergoing quite a lot of stress unless the displacement is high and the piston moves relatively slowly, and also cooling (Curie temperature).
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Old 05-01-2014, 11:09 AM   #8 (permalink)
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I looked at this and first thought was ... 2-stroke diesel pile driver!

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Old 05-01-2014, 12:24 PM   #9 (permalink)
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Cool engine design, but the thread title is oddly worded - this engine would be used in a hybrid car, by definition. It would make sense to have it in a plugin hybrid - and it would be a serial hybrid, by definition.

It bypasses the whole crankshaft / offset vector problem, and it has no camshaft, or valve springs, either. Much lower parasitic losses. I wonder if it uses a magnetic or an air spring to return the piston to TDC? Edit: it is a gas spring - I shoulda' read the whole article.

It does appear to be a 2-stroke but it also has electrically (pneumatically?) actuated valves, so it is unlikely to "leak" unburned fumes out through the exhaust.

More info here: http://www.greencarcongress.com/2014...0422-fpeg.html
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Old 05-01-2014, 07:46 PM   #10 (permalink)
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http://www1.eere.energy.gov/hydrogen...fs/30535bf.pdf

15 years ago.

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