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Prius revenerative brakeing modulated?

Discussion in 'Gen 3 Prius Main Forum' started by mikdik, Sep 5, 2009.

  1. mikdik

    mikdik New Member

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    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    III
    Is Prius Gen III regen braking either ON of OFF or is is MODULATED by varying pressures on the brake pedal? Another way of asking - if I am cruising at highway speed and take my foot off of the accelerator, kinetic energy is clearly converted to electrical energy and stored, resulting in some vehicle slow down (emulating engine compression). Now, if I PRESS LIGHTLY on the brake pedal, just enough so that I can feel in increase in deceleration, has the hybrid system INCREASED THE RATE OF REGENERATIVE BRAKING or simply added mechanical (hydraulic) brakes? If I press a little harder on the brake pedal to slow a little faster, does the rate of regeneration increase? Do the mechanical brake shoes (pucks?) literally NOT ENGAGE AT ALL as long as I keep only light to moderate pressure on the brake pedal (until I slow below 7 mph)?
     
    #1 mikdik, Sep 5, 2009
  2. yardman 49

    yardman 49 Active Member

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    Location:
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    Vehicle:
    2009 Prius
    It's modulated, as far as I know But for a hard or panic stop, the friction brakes activate, even if you are above 7 mph.
     
    #2 yardman 49, Sep 5, 2009
  3. Dozzer

    Dozzer Prius Noob

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    Location:
    Swansea, UK
    Vehicle:
    2008 Prius
    Yes it's fully modulated. If you want to know what's going on inside, get a hold of a Scanguage2, shows all the interesting bits going on..
     
    #3 Dozzer, Sep 5, 2009
  4. hobbit

    hobbit Senior Member

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    Location:
    Bahstahn
    Vehicle:
    2004 Prius
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    N/A
    If it wasn't modulated by foot pressure it would feel much more
    jerky and abrupt. Watch your HSI and how the "charge" portion
    changes as you vary your foot -- that's a fairly reasonable
    representation of how much regen current is being sent to your
    battery.
    .
    _H*
     
    #4 hobbit, Sep 5, 2009
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