1. Attachments are working again! Check out this thread for more details and to report any other bugs.

0-60mph ECO vs. PWR

Discussion in 'Gen 3 Prius Main Forum' started by Tideland Prius, Apr 20, 2010.

  1. austingreen

    austingreen Senior Member

    Joined:
    Nov 3, 2009
    13,525
    4,057
    0
    Location:
    Austin, TX, USA
    Vehicle:
    2018 Tesla Model 3
    Model:
    N/A
    It sounds like resume on a flat road will act exactly the same. I hadn't read the whole thread. My observations really are only about sustained speed in cruise control on hills.

    The gear teeth do remain constant, but the ratio of rotation between the wheels and ice do not. If MG1 is free turning their is no transfer of rotation. If MG1 spins one way the ice will spin faster relatively to the ring gear, that is eventually geared to the wheels. A stopped MG1 would have a one to one correspondence, and MG1 spinning the other way would multiply the ice rotation or what is normally thought of as over drive. Since the rotation of the ring gear has a variable rotation corresponding to the ice shaft, I would call it a variable gear ratio. Not having worked in transmissions there is probably better terminology for what is going on in the eCVT.
     
  2. qbee42

    qbee42 My other car is a boat

    Joined:
    Mar 2, 2006
    18,058
    3,073
    7
    Location:
    Northern Michigan
    Vehicle:
    2006 Prius
    Power Split Device. That's a better description. It's not a variable gear ratio in any sense of the term. You could correctly say "variable effective gear ratio", which sounds almost the same but is technically correct.

    Tom
     
  3. Mrn

    Mrn New Member

    Joined:
    May 8, 2010
    13
    1
    0
    Location:
    Europe
    Vehicle:
    2010 Prius
    Model:
    Three
    .. you mean "ect" ;)
     
  4. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

    Joined:
    Oct 2, 2004
    44,767
    16,014
    41
    Location:
    Canada
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    They already use ECT for their automatics lol.
     
  5. movingforward

    movingforward Member

    Joined:
    Dec 12, 2011
    169
    11
    0
    Location:
    The Great White North
    Vehicle:
    2011 Prius
    Model:
    Three
    I guess when you're accelerating from a red light in either eco or power mode it is the same. I've driven in standard mode for one month and am now running purely in power mode this month and I do find that i accelerate faster from stand still. My fuel economy hasn't changed much either. Standard mode acceleration feels very sluggish to me. I did not do any scientific observation of course...so i find it really hard to believe that eco mode will accelerate as fast a PWR mode.

    So since I'm now addicted in PWR mode, is there away to keep it in that mode all the time after I shut the hybrid system down? Right now everytime I get in the car I have to push the PWR mode button all the time. Anyway to default it?
     
  6. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,035
    10,010
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    No. If it could be defaulted, discussions here several years ago figured it probably would have had to go through EPA testing in that mode. Toyota already appeared to be on the hairy edge of not getting that 50 mpg label, and could not afford to lose even a small fraction of 1 mpg without falling to a market-disappointing 49.
     
  7. movingforward

    movingforward Member

    Joined:
    Dec 12, 2011
    169
    11
    0
    Location:
    The Great White North
    Vehicle:
    2011 Prius
    Model:
    Three
    What the? You gotta love the level of bureaucratic intrusion we have to face. I'm achieving over 50mpg in the winter running at pwr mode for the past 2 weeks! I'm loving this car.
     
  8. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,035
    10,010
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Because your driving pattern almost certainly does not match the standardized test, the fact that you can get 50 in winter in your particular circumstances isn't very relevant. Similarly, post-hypermiling, I get 27-29 in winter in a nonhybrid now re-rated (2008 rules) at 21. Pre-hypermiling, I was getting 32 in winter in a car since re-rated at 26. But many other drivers in other circumstances can't get these results even in ideal weather, which is why the EPA has to define and stick with standardized test methods.

    There is no government bureaucracy forcing Toyota to not allow PWR as a default. There would be no skin off any beaurocrat's hide if the Prius carried an EPA label of 49 mpg just because it fell 0.02 short of the rounding or other threshold for a label of 50. But this label would have really hurt at Toyota's marketing department. Toyota drove the choice.
     
  9. movingforward

    movingforward Member

    Joined:
    Dec 12, 2011
    169
    11
    0
    Location:
    The Great White North
    Vehicle:
    2011 Prius
    Model:
    Three
    a minor inconvenience from toyota for not allowing us to default certain features. Consumer's report has done more for the environment than the epa could ever imagine.
     
  10. F8L

    F8L Protecting Habitat & AG Lands

    Joined:
    Aug 14, 2006
    19,011
    4,080
    50
    Location:
    Grass Valley, CA.
    Vehicle:
    Other Non-Hybrid
    Model:
    N/A
    The acceleration is the same if you apply WOT. Only the throttle mapping is changed between the 3 modes.
     
  11. LDB

    LDB Member

    Joined:
    Jun 13, 2013
    279
    71
    0
    Location:
    Friendswood (Houston south suburb)
    Vehicle:
    2015 Prius
    Model:
    Three
    Isn't the short version that the buttons only affect the sensitivity of the pedal and do nothing to the actual engine/motor output? That's what it seems like in my admittedly short but growing time in the car.
     
  12. qdllc

    qdllc Senior Member

    Joined:
    Aug 25, 2013
    1,358
    395
    0
    Vehicle:
    2013 Prius
    Model:
    Two
    Yes and no. The most notable difference is response from the ICE when the pedal is pressed. ECO is a "softer" response. PWR is a "harder" response, and neither = default response.

    HOWEVER, being in ECO mode has other items of the car (most notably the AC) run at lower power levels. It gets the job done, but over a longer time. PWR (I've found) actually seems to cancel out the "ECO" range on the HSI. You're not even in the PWR band but ECO is not lit. If you want the AC to work at maximum effectiveness, switch into PWR mode.

    I'm not sure which does what if you have neither mode selected.
     
  13. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,466
    38,101
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Yup. And using neither, throttle response is very linear.
     
  14. David Beale

    David Beale Senior Member

    Joined:
    Jul 24, 2006
    5,963
    1,979
    0
    Location:
    Edmonton Alberta
    Vehicle:
    2012 Prius
    Wow, the increadable recurring thread!
     
  15. Ozark Man

    Ozark Man Member

    Joined:
    Sep 23, 2015
    173
    64
    0
    Location:
    Mississippi
    Vehicle:
    2017 Prius
    Model:
    Four Touring
    I wish I didn't have to push the power mode button again each time I start. That's not true of the eco button. I guess they want you to drive in eco but sometimes I forget to push the power button and drive a while in the normal mode.
     
  16. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    54,466
    38,101
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    That's not the end of the world.
     
  17. qdllc

    qdllc Senior Member

    Joined:
    Aug 25, 2013
    1,358
    395
    0
    Vehicle:
    2013 Prius
    Model:
    Two
    Bump it to the top on October 31 as a zombie thread. :whistle:
     
  18. JStrenk

    JStrenk Member

    Joined:
    Nov 29, 2011
    197
    98
    0
    Location:
    Ravenna
    Vehicle:
    2016 Prius
    Model:
    Two
    Dang, and I was just going to ask if it's faster in Power and B mode....
     
  19. JimboPalmer

    JimboPalmer Tsar of all the Rushers

    Joined:
    Apr 14, 2009
    12,470
    6,862
    2
    Location:
    Greenwood MS USA
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    No and hell no. (B mode only affects Deceleration)
     
  20. Lasllc

    Lasllc New Member

    Joined:
    Aug 26, 2015
    6
    0
    0
    Location:
    Denver Area
    Vehicle:
    2015 Prius
    Model:
    Four
    Are you sure ? There has been very little to no real analytical discussion covering B mode and its relationship to ECO, PWR and Park.