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Thread: Free piston engines

  1. #1 Free piston engines 
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    Free piston engine generators are believed to have two time efficiency of usual ICE when work at optimal efficiency.
    Free-piston engine - Wikipedia, the free encyclopedia
    Why they still not used in hydrids as electricity generators?


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  3. #2  
    Brassica oleracea Strange's Avatar
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    That article doesn't say anything about that level of efficiency. It does point out that the problem is control. This may be even more important in a safety-critical system like a passenger vehicle. So I guess, at the moment, it just isn't cost effective.


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  4. #3  
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    I encountered a news about this sort of engine some time ago, here it is:
    MSU researchers create a new engine prototype (w/ video)

    It says: "[it] has the potential to reduce auto emissions up to 90 percent, when compared to the current emissions level."
    - In the comment: some commenter argue about possibility of low torque... but some argue (if that's the case) then its still suitable for recharging electric car.
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    And there is this novel design, as well: Libralato Engines Technology Overview
    "100% better power to weight ratio ... quiet ... low emission ... lower temperature ..."

    Almost too good to be true...
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  6. #5  
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    Ok, I've done some searching about Libralato Engine.

    The engine seems to be working: Libralato Proof of Concept Engine Test - YouTube
    Also Libralato Engine ltd. seems to be one of the winner for "Low Carbon Vehicle Partnership (LowCVP) Technology Challenge" in 2009: LowCVP | Technology Challenge | Winners of the 2009 LowCVP Technology Challenge

    Maybe their claim were true???
    ----
    I think the Wave Disk engine from MSU is true too, except maybe its proprietary. So they don't have the publicity.
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  7. #6  
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    That article doesn't say anything about that level of efficiency.
    This one does: Free-piston engine could be twice as fuel efficient as combustion engines
    It does point out that the problem is control.
    I whish to know detailed explanation why there is problem with control?It looks like a quite simple engine.
    So I guess, at the moment, it just isn't cost effective.
    It suppose to be cost efficient.
    1)It doesn`t require transaxle.
    2)Instead of litres of oil it requires just a grams.
    3)It much smaller and requires less working parts.
    4)It would constantly work at optimal efficiency and saves lot of fuel.
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  8. #7  
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    Quote Originally Posted by Stanley514 View Post
    I whish to know detailed explanation why there is problem with control?It looks like a quite simple engine.
    It looks like the problem is keeping multiple cylinders synchronized (because they are not tied together by a crankshaft). If you could have a single cylinder alternator (as in that article) then that may not be so much of a problem. But it does say that is a new design. It can take many years to get something from a lab prototype to production. And to get from theoretical efficiency to real cost savings.
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  9. #8  
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    Is it possible to create serial hybrid design in which free piston alternator would power AC motor directly and
    battery would only supplement the process?In typical design such as Chevy Volt all energy is going through battery and hence there is a looses.
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  10. #9  
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    The free piston engine was replaced in 2012, and the solid piston is replaced by liquid and that travells through a hydro turbine. Moving parts are reduced to one, it is full Diesel combustion. Its rated at 92% efficient.

    Gone to search for original posting, shall post upon finding.

    Found full gas engine but liquid piston remains elusive.

    http://i1225.photobucket.com/albums/...Untitled-1.png

    Found liquid piston,

    http://i1225.photobucket.com/albums/...y/DaSValve.png
    Last edited by DaS Energy; December 25th, 2012 at 02:55 AM. Reason: attachment
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