Toyota Unveils Fuel-saving Technologies for New Prius

Discussion in 'Gen 4 Prius Main Forum' started by usbseawolf2000, Oct 25, 2015.

  1. Sergiospl

    Sergiospl Senior Member

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    cyclopathic likes this.
  2. energyandair

    energyandair Active Member

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    Or at least some parts of it are, enabling Toyota to make other improvements with no significant increase in overall weight
     
  3. David Beale

    David Beale Senior Member

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    The fourth gen is heavier. Based on the released media files posted on this forum. Not a lot, as I recall in the 100 lb range or a bit less. Do note, contrary to some complainers, Toyota claims it is "faster" in acceleration. Graphs have been posted.

    Yes, "B" relies on "pumping losses". But it also includes friction. Reduce that friction and you reduce some drag. Reduce aero losses with lower Cd and smaller or similar frontal area and you reduce drag.

    So I ask again, will the fourth gen take off even more than the GII and GIII descending a mountain pass?
     
  4. bisco

    bisco cookie crumbler

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    i heard 10 lbs.
     
  5. bisco

    bisco cookie crumbler

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    mr bill says it doesn't rely on friction. how can we find the truth?
     
  6. spwolf

    spwolf Senior Member

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    pretty cool beans
     
  7. bisco

    bisco cookie crumbler

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    that is a remarkable achievement.
     
  8. Tideland Prius

    Tideland Prius Moderator of the North
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    The 2nd part of it... Isn't that already available on the 3rd Gen?
     
  9. bisco

    bisco cookie crumbler

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    the two tone airflow?
     
  10. Tideland Prius

    Tideland Prius Moderator of the North
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    Yeah. Fresh air at the top to keep the windows clear and recirc at the foot level to speed up heating.
     
  11. MrBillTulsa

    MrBillTulsa Member

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    Since you asked again, though I'm not sure that you were asking me, here are my two cents worth.

    In measuring forces that induce slowing of a mass in motion, all forces are cumulative and must be considered in sum and in total. In the case of braking forces for the Prius, these forces, of course, include the effects of aerodynamic drag, rolling resistances, and mechanical forces, both induced (as with pumping losses) and parasitic (as in engine and drivetrain friction). Any and all of these forces can be measured individually, and added cumulatively.

    As expected, some of these forces are larger than others. The larger the force, the larger the effect will be on acceleration (deceleration), where acceleration equals force x time.

    In comparing the deceleration forces between say a GEN 3 and a GEN 4 prius, we are actually considering the change in the force (delta f) between the two models. As for aerodynamic drag, considering the change of 0.01 in the coefficient of drag (delta cD), the resultant change in force would hardly be significant - I presume it to be hardly measurable.

    Similarly, the delta f in engine friction and in rolling resistance is uniquely small, possibly comparable to each other, but still a tiny fraction of the designed function of engine braking utilizing pumping losses.

    Coming from me, this is not an exact science, and I have not consulted exact values for the forces, or the change in forces involved; it is more of an exercise in thought. It is intuitive by nature, however, that the braking force derived from the designed pumping losses of the ICE far, far outweigh the combined forces of all of the other mentioned forces combined. In other words, the change in forces of aero, rolling, and friction losses would be nearly if not completely insignificant.

    So, to answer your question: Yes, the fourth gen Prius will take off even more than the GII and GIII descending a mountain pass, a little bit (all else being equal), but not much.

    :eek:
     
    #31 MrBillTulsa, Oct 30, 2015
    Last edited: Oct 30, 2015
  12. usbseawolf2000

    usbseawolf2000 HSD PhD

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    If the driver lose 20 lbs, the net weight reduction will be 10 lbs. ;)
     
    #32 usbseawolf2000, Oct 30, 2015
    Last edited: Oct 30, 2015
    Jeff N and bisco like this.
  13. bisco

    bisco cookie crumbler

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    i qualify for the possibility.:cool:
     
  14. bisco

    bisco cookie crumbler

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    idk, but i've never noticed it. is it in the manual, or tech papers?
     
    #34 bisco, Oct 30, 2015
    Last edited: Oct 30, 2015
  15. giora

    giora Senior Member

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    Maybe in G4 they will make it more noticeable.
     
  16. bisco

    bisco cookie crumbler

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    yes, perhaps it's a 30% improvement over the old system. double suction blower structure?
     
  17. Tideland Prius

    Tideland Prius Moderator of the North
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    Tech papers.

    This is all I could find in the 2010 owner's manual

    I can't find the Denso news release on it. The only one I could find talks about the new ejector cycle for the A/C unit for the 2010 Prius.
     
  18. civicdriver06

    civicdriver06 Active Member

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    Well if it is,it doesn't work !
    At least not for me .
    It takes way too long for the windshield to clear up,I hope they improved that on gen. 4 !
     
  19. bisco

    bisco cookie crumbler

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    when i put mine on floor/defrost, i think the a/c comes on. there's a difference between fog and ice.
     
  20. chinna

    chinna Member

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    David,

    Toyota never claimed it has better acceleration times, but rather acceleration curves has been modified to make it smoother (it is more gradual now), and make it feel better relative to accelerator position (basically, response tuning).

    So, don't raise hopes up!

    Thx