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Minimum mph regen? Plus diagonal regen graph?

Discussion in 'Gen 4 Prius Fuel Economy' started by Blizzard_Persona, Aug 26, 2016.

  1. Blizzard_Persona

    Blizzard_Persona Senior Member

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    Do the Gen 4's have a minimum MPH for regen while slowing down with light braking like I believe the Gen 3 had (9mph perhaps? I could be wrong here?) or does it regen till it comes to a full stop?

    Second question is in reference to the diagonal regen graph on the dash as pictured below.. do the Gen 4's stop the regen ability after the graph passes the horizontal line above the "CHG" or does it regen all the way till the bottom of the graph and anything after that is friction braking?

    View attachment 116037
    [​IMG]
     
    #1 Blizzard_Persona, Aug 26, 2016
    Last edited by a moderator: Aug 26, 2016
  2. DonDNH

    DonDNH Senior Member

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    I believe regen on the Gen-4 still shuts off at about 7 MPH.

    Regen begins when the green bar on the graph goes below the line at about 10 o'clock position and continues all the way to the line at the 9 o'clock position.
     
    #2 DonDNH, Aug 26, 2016
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  3. DonDNH

    DonDNH Senior Member

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    I may have misspoken here. I noticed that the regen bar was still below the line as low as 3 MPH over the weekend. It might be that regen operates at lower speeds on the Gen-4s than the Gen-3s.
     
    #3 DonDNH, Aug 29, 2016
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  4. robsnyder20

    robsnyder20 Active Member

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    It does seem to regen at pretty low speeds (like down to 3MPH) but really not sure how functional it is. As a side note, using my torque app, I noticed the engine revs up when hitting the brakes which my guess is for downshifting in a standard shift car and at first, thought this happened when the battery was full but in this case was only about 50% and I live in florida so no hilly sections either.
     
    #4 robsnyder20, Sep 7, 2016
    Last edited: Sep 7, 2016
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  5. Blizzard_Persona

    Blizzard_Persona Senior Member

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    Just to confirm, is it a concensus that the car will not regen past the bottom 1/4 of the regen graph.

    I.e. To the left of the CHG letters and below the dotted line?? I really thought that the regen was that entire downward graph and that anything past the very bottom line are the friction brakes?

    Pls confirm / enlighten me if you know for sure.

    Thank you.

    See my crude photoshop for reference. The area I highlighted yellow and drew the arrow to is what I'm talking about..

    image.jpeg
     
    #5 Blizzard_Persona, Sep 7, 2016
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  6. robsnyder20

    robsnyder20 Active Member

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    I will have to pay closer attention to this and let you know. I wish I could program more on my torque app to see whether it is adding more energy than other stops when down in the lower max area.
     
    #6 robsnyder20, Sep 8, 2016
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  7. DonDNH

    DonDNH Senior Member

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    I would disagree with that statement. I believe regen works all the way to the bottom.
     
    #7 DonDNH, Sep 9, 2016
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  8. Blizzard_Persona

    Blizzard_Persona Senior Member

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    That's what I'm trying to confirm, as you said in post #2 (I might be misinterpreting your post though) that:


    --When you say, the line at then 9 o'clock position that to me means the dotted CHG line, the area I was questioning..

    If the car regens the whole way down, that would be awesome. Does anyone know for sure? Lol.
     
    #8 Blizzard_Persona, Sep 9, 2016
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  9. DonDNH

    DonDNH Senior Member

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    My intention was to say regen was all the way to the solid line at the bottom of the graph. Both the solid bottom and the dotted line are at the 9 o'clock position. Sorry for the confusion.
     
    #9 DonDNH, Sep 9, 2016
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  10. Blizzard_Persona

    Blizzard_Persona Senior Member

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    Understood. Thank you for clarifying.

    I have to setup and actually start using my scan guage, but would that show for sure if regen does go to the bottom? And yeah why wouldn't it??

    Not sure why I had this stuck in my head that it won't regen in that last little area, I thought someone else on here mentioned that in the past and maybe that's why I keep questioning it and have been careful to not max out that bottom line. Lol.:rolleyes:
     
    #10 Blizzard_Persona, Sep 9, 2016
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  11. MikeDee

    MikeDee Senior Member

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    According to the owners manual, the whole lower curved graph area is regen. Not sure what the dashed line means though.
     
    #11 MikeDee, Jan 8, 2017
  12. Prodigyplace

    Prodigyplace Senior Member

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    "the owners manual"
    2013?
    2016?
    2017?
     
    #12 Prodigyplace, Jan 8, 2017
  13. Prodigyplace

    Prodigyplace Senior Member

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    From the 2017 owners manual:
    upload_2017-1-8_15-16-0.png
    upload_2017-1-8_15-16-22.png
     
    #13 Prodigyplace, Jan 8, 2017
  14. MikeDee

    MikeDee Senior Member

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    2017 Prime manual, instrument cluster section, pg. 210.
     
    #14 MikeDee, Jan 8, 2017
  15. Prodigyplace

    Prodigyplace Senior Member

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    This is the Gen 4 Lift-back section, not Prime.
    In this case the information appears to be the same.
     
    #15 Prodigyplace, Jan 8, 2017
  16. MikeDee

    MikeDee Senior Member

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    Wrong. It's for both and I bet there's no difference between the two anyway.
     
    #16 MikeDee, Jan 8, 2017
  17. MikeDee

    MikeDee Senior Member

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    I think the dashed line refers to the battery icon to the right. When the battery is below the dashed line, the engine comes on to charge it.
     
    #17 MikeDee, Jan 9, 2017
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  18. Chippingawayatlife

    Chippingawayatlife Active Member

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    Wait. So if I hit hard on the brakes coming down a mountain and the bar goes to the farthest bottom, did it completely switch to friction brake? Or does the friction brake aid the Regen?
    Hip
     
    #18 Chippingawayatlife, Jan 20, 2017
  19. RCO

    RCO Senior Member

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    They both work together when necessary, hence Synergy.
     
    #19 RCO, Jan 20, 2017
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