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Glide vs Heretical: what is the difference?

Discussion in 'Gen 2 Prius Fuel Economy' started by lpf, Apr 8, 2020.

  1. ChapmanF

    ChapmanF Senior Member

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    At this rate, somebody's going to diction-check the Enterprise for not having traction beams.
     
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  2. sam spade 2

    sam spade 2 Senior Member

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    NO.
    Of course you can "coast" when going downhill and let gravity do the work.
    In all other circumstances, something must continuously overcome friction and wind resistance to keep it going.
    The glider plane "rides" air currents.......and eventually comes down.
     
  3. The Electric Me

    The Electric Me Go Speed Go!

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    You can call me a Prius Hybrid Heretic, but I think you are overthinking everything.
    I'd just "Glide" my way to just driving it.

    The vehicle is very good at being efficient on it's own, for itself AND it also nearly subconsciously will slowly teach you how to coax more out of it, once you've owned and driven it for more than 2 months.
    You'll just get a feel for how you want to drive, and what efficiency feedback that will return.
     
  4. ice9

    ice9 Active Member

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    No I was talking about FARM equipment not a transporter. Let's not muddy the waters.:cool:
     
  5. dolj

    dolj Senior Member

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    No it is not useless for its intended purpose. It was not intended to be used to drain the HV battery by driving 2 km at under 42 km/h. You got to always remember, "horse for courses."
    Ok, then, you're a Prius Hybrid heretic. :p:D;):) but, I do agree with the overthinking it.
    While I agree with the first statement, I totally disagree with the second. I was forever frustrated trying to get better than 5.2 L/100km (45 MPG US) until I started looking at how you did the various hypermiler techniques. "Pulse and Glide", by far, was the best "bang for my buck", and now the "off the accelerator, just the right on the accelerator" is second nature. Universal techniques for economical driving like anticipating traffic and lights/stops ahead, slowing down (where required) early and accelerating in the optimal band (neither too slow nor too fast), all helped as well. Without learning these techniques I was not (and never would have) been able to get my consumption down to tanks of 4.4 - 4.1 L/100 km (53 - 57 MPG US) and my lifetime average to 4.7 L/100 km (50 MPG US). (y)
     
  6. lpf

    lpf Member

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    I think the animation you're talking can be found here: Toyota Prius - Power Split Device[/QUOTE]
     
  7. ChapmanF

    ChapmanF Senior Member

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    That's the same link that was in my post. :)

    Only, the animation is done in Adobe Flash, which modern browsers place behind an ever-growing chain of warnings and security blocks, and are (if I remember right) poised to stop supporting completely in the next year or so.
     
  8. lpf

    lpf Member

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    Yes but it is the only one found... By the way, adding ICE rpm does not alter road speed...
     
  9. ChapmanF

    ChapmanF Senior Member

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    Welcome to the joys of having a continuously variable transmission!

    Within a certain wide range, lots of engine rpms can go with the same road speed. Or lots of road speeds can go with the same engine rpms.

    But the engine has a rpm-power curve, mostly indicating that when you want more power, you'll need a higher engine rpm. So most of the time when you want to alter road speed (say, by pressing harder on the go pedal), that'll be made to happen by adding ICE rpm..
     
  10. lpf

    lpf Member

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    "By the way, adding ICE rpm does not alter road speed..." Sorry but I am talking about this animation only. Not about real driving.

    By the way, thanks to your patience and contribution that's widening my knowledge!
     
  11. ChapmanF

    ChapmanF Senior Member

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    I sort of enjoy the converse effect, where you can accelerate by holding the engine speed more or less constant the whole time the car is picking up speed. Sounds more like flying a plane than driving.

    I'm sure when Hart was developing that animation, he had to just decide what would change if you were dragging the engine rpm slider, because there are three speeds to look at but connected by fixed gearing so any one of the three is always determined by the other two.
     
  12. The Electric Me

    The Electric Me Go Speed Go!

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    Well, what I'm saying to a very new owner? Is what I remember, and that is that the software and feedback the Prius offers? Very much teaches you how to become a more efficient driver of the vehicle.

    Personally, and this personal to myself, I was never in to applying a lot of the formal "hypermiling" techniques. Many of them which you mention..." anticipating traffic and lights/stops ahead, slowing down (where required) early and accelerating in the optimal band " ARE what I'm talking about...the software and feedback encourages this behavior, naturally and automatically.

    I investigated formal hypermiling techniques. But for me there was a spectrum in what the definitive cannon of Hypermiling includes, which to me goes from a lot of common sense suggestions, that again I think are naturally encouraged by the software, to some rather extreme suggestions that I think can actually be dangerous to apply.

    For me personally, I got the 50ish MPG fuel economy and efficiency I wanted, and I found I really didn't have to think about it too much.
    I also think sometimes New hybrid owners, first time owners, look for some "secret handshake" that they believe will unlock some additional level of much greater efficiency. So I think they often DO overthink the whole operation.
    My advice to new owners looking for that Prius operation "easter egg", is to just drive it. After a couple of months, feel free to look into more intensive hypermiling techniques if you wish. But, you might find that it's really unnecessary, and at least you'll have the base comparative of knowing what MPG you get just driving it, vs. application of various additional techniques.
     
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  13. lpf

    lpf Member

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    Well, as a new owner I can say:
    1. This 2007 Prius was my choice, to have a relatively large car with low consumption. Compare 5lt/100 km to my previous 11-12lt (Citroen C5 2.0)
    2. Prius changed my way of driving to smoother, more laid-back style. This was not a decision taken but came in a few days just driving the car.
    3. I'm now just reading technicalities, to find a way (if exists) to have better consumption in the open road.
    That's all and I keep your phrase "and I found I really didn't have to think about it too much"
     
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