Featured New VW Engine

Discussion in 'Prius, Hybrid, EV and Alt-Fuel News' started by bwilson4web, Mar 19, 2018.

  1. bwilson4web

    bwilson4web i3 and Prime

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    I like engines and this one has a clever twist: Volkswagen Millerized 1.5 TSI ACT BlueMotion gasoline engine offers diesel-like fuel economy; derivatives may be applied in hybrid systems

    Volkswagen has developed and deployed a gasoline engine that offers diesel-like fuel economy but is significantly cheaper to buy. Currently applied in the new Golf and Golf Variant (earlier post), the 1.5 TSI ACT BlueMotion delivers 96 kW / 130 PS with combined fuel consumption of 4.8 l/100 km (49 mpg US). The NEDC extra-urban figure drops as low as 4.0 l/100 km/h (59 mpg US).

    The 1.5-liter engine (earlier post) is 10% more efficient than comparable gasoline engines; Volkswagen achieves this through the new TSI Miller combustion process and the use of a high-tech turbocharger with variable turbine geometry (VTG).
    . . .
    Compared with other gasoline engines, the intake valves of the 1.5 TSI ACT BlueMotion are open for a shorter time; the intake valves are closed during the intake stroke at a time when the piston still has a little way to travel and is moving further downward. This leads to a reduction in throttling losses under partial load.
    . . .

    The valve trick accomplishes part of an Atkinson cycle with lower valve train energy loss. When more power is needed, the turbocharger compresses more of the intake air. But the thing I really like:

    The micro-hybrid system utilizes the 12-volt electrical system architecture and a compact lithium-ion battery to supply all relevant systems in the car with energy during the phases when the engine is inactive.

    Suddenly a lot of 48V hype gets a little thinner.

    Bob Wilson
     
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  2. bisco

    bisco cookie crumbler

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    ingenious, but reliable? how does it test out on pollution?
     
  3. Prodigyplace

    Prodigyplace Senior Member

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    Diesel-like fie economy.
    You mean under testing it is more economical than in real world use? :eek:
     
  4. austingreen

    austingreen Senior Member

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    Yikes.
    sounds like a similar system to the $295 ford start stop system. That does great on nedc cycle but doesn't improve things much on epa cycle at all.

    Since this is europe only I'm assuming premium gasoline type octane, where mazda's skyactiv-g makes 14:1 compression. THey say 10% more efficient than the 1.4l turbo.

    Compare Side-by-Side


    That's about 1 mpg better than the honda civic with a 1.5l turbo. Its not a huge step. Add a 48V bas system to a civic and you probably boost it 2 more than the jetta turbo ;-)

    Don't believe the hype. If you dropped that new 2L toyota engine in a corrola it would probably get better fuel economy in the real world than a jetta with this new blue motion micro hybrid system. All the turbo engines from major manufacturers run at least part of the time in miller cycle.[/quote]
     
    #4 austingreen, Mar 19, 2018
    Last edited: Mar 19, 2018
  5. telmo744

    telmo744 HSD fanatic

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    Last week one of these 1.5TSI was tested in a portuguese mag. Fuel consumption recorded: 34.5MPG.
    "Not bad", the journalist wrote, stating "well, it delivers 150hp".

    I say it is a very weak step forward...
     
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  6. bisco

    bisco cookie crumbler

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    not bad in a 6,000 lb truck though.
     
  7. Trollbait

    Trollbait It's a D&D thing

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    Micro-hybrid is a long time synonym for an auto start/stop system. What is new here is that VW is shutting off the engine during coasts instead of just stops. How effective it is depends on the battery capacity. 12 volts won't be running the A/C.
     
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  8. austingreen

    austingreen Senior Member

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    Yes, they seem to be promising something that technically is tough
    We don't really know how big the micro hybrid lithium battery will be. They claim 4.8l/100km on nedc combined, its hard to believe it would be 5.2l/100km and this will help 8%, versus deactivating 2 cylinders down to 0.75 L of pumping. I am deeply skeptical that this will get nearly the bonus in the real world (IRL) or epa testing.

    The main blurb talks about a variable geometry turbo which are used on diesels versus the twin scroll used on gasoline 4 cyclinder engines like the honda and toyota 4 cylinder turbo charged energy. The downside of variable geometry turbo chargers is they are more expensive than twin scroll which many consider good enough. The downside of twin scroll is turbo lag, which doesn't matter if you have even a mild hybrid ;-)

    I wonder if vw will even call it a micro hybrid if they sell it in the North America.
     
  9. bwilson4web

    bwilson4web i3 and Prime

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    They could call it "APOLOGY."

    Bob Wilson
     
  10. Roy2001

    Roy2001 Active Member

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    Diesel-like fie economy only when EPA test it :LOL:
     
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  11. Prodigyplace

    Prodigyplace Senior Member

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    That is what I typoed in post 3
     
  12. Trollbait

    Trollbait It's a D&D thing

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    But will the EPA test under report its fuel economy like it does for actual diesels.;)
     
  13. Prodigyplace

    Prodigyplace Senior Member

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    I think they reserve that treatment for hybrids. :(
     
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  14. Trollbait

    Trollbait It's a D&D thing

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    Actually, if go to Fuelly or other such tracking sites, you'll see that the average reported fuel economy for most cars, including hybrids, is pretty close to the post 2008 EPA estimate for combined. Remember, the 2008 changes were because people were complaining that hybrids weren't reaching the higher estimates back then. My 2005 Prius had a 60mpg value on the window sticker.

    For diesels, such user tracking sites was showing that the estimates were under reporting what the cars would get in the real world. That data was pre-2008, and thus before the stricter emission targets. So I can't say if the EPA results are still under reporting what the cars get with the emission controls they now use.
     
  15. hill

    hill High Fiber Member

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    poor poor VW . . . . will they ever get a fair shake ??
    :D
    .
     
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  16. Prodigyplace

    Prodigyplace Senior Member

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    I think they need to shake out a few more corrupt executives (is that a redundant term?) first.
     
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