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

Difference in regen by pressing down on cc knob vs brakes?

Discussion in 'Gen 3 Prius Main Forum' started by hayden55, Feb 2, 2018.

  1. hayden55

    hayden55 Member

    Joined:
    Jan 29, 2017
    115
    48
    0
    Location:
    USA
    Vehicle:
    2010 Prius
    Model:
    N/A
    I dont know if anybody else has noticed but if you have cc on above 25 mph and hold the cc stalk down it basically functions as a pretty dang strong elec brake. Is there a difference in regen efficiency on this versus the brake pedal? I noticed it would stop at a specific range in the band but still stopped at a strong rate. Thoughts, fellow Hypermilers? The reason I ask is because the old Prius guys and other hybrid enthusiast would wire in a circuit to mess with the resistance on the pedal to basically increase the strength of the regen without hardly touching the pedal and they reported a difference in mpg
     
    #1 hayden55, Feb 2, 2018
  2. Maarten28

    Maarten28 Active Member

    Joined:
    Jul 13, 2014
    414
    224
    1
    Location:
    Netherlands
    Vehicle:
    2011 Prius
    Model:
    Three
    I noticed that too. I've been meaning to test some things out with torque to see if the brake pads get used, but it does seem that it brakes more than I could using the full regen capability (which is rather limited in the cold weather we have now). If that's just my mind playing tricks because I'm not actively braking, I don't know.
     
    #2 Maarten28, Feb 5, 2018
  3. qdllc

    qdllc Senior Member

    Joined:
    Aug 25, 2013
    1,358
    396
    0
    Vehicle:
    2013 Prius
    Model:
    Two
    All I know is that when the CC is engaged, the system uses the max regen braking if needed. Pads do not engage. I’m not sure how that compares to pressing the brake gently. I think the system can tap more regen capacity while running the CC than you could with the brake pedal. I also know that if it can’t maintain set speed with regen braking, it will employ engine braking. If your battery hits max charge, it goes entirely to compresson braking.
     
    #3 qdllc, Feb 5, 2018
  4. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,123
    10,049
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    I am not aware that CC can do so. The main potential advantage would be that CC doesn't blend in the friction pads along with the regen. And doesn't waste any energy on brake lights :).

    For reasons of better / faster / easier control, and less opportunity for operator confusion, I nearly always stick to the brake pedal regen. My foot can respond to sudden situational changes reflexively and nearly instantly, where my fingers on the CC controls can easily flub things.

    CC regen is reserved for moderate downhills were constant speed is acceptable. No slowing required, it only needs to prevent gravitational speed-up.
     
    #4 fuzzy1, Feb 5, 2018
  5. hayden55

    hayden55 Member

    Joined:
    Jan 29, 2017
    115
    48
    0
    Location:
    USA
    Vehicle:
    2010 Prius
    Model:
    N/A
    My typically way of driviing is called DWB or "driving without brakes" so I typically do a lot more p n g and regen as much as possible, and when I have to use the brakes it better be for a good reason. On my Honda that was the biggest increase to my mileage I saw right behind p n g, So I figured if I could get more efficiency out of the hybrid system I could go even further.
     
    #5 hayden55, Feb 5, 2018
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,801
    48,998
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    a scan gauge will show it, i think,
     
    #6 bisco, Feb 5, 2018
  7. hayden55

    hayden55 Member

    Joined:
    Jan 29, 2017
    115
    48
    0
    Location:
    USA
    Vehicle:
    2010 Prius
    Model:
    N/A
    Which setting?
     
    #7 hayden55, Feb 6, 2018
  8. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,801
    48,998
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    i don't have one, but folks here mention watching regen and caliper pressure on it.
     
    #8 bisco, Feb 6, 2018
  9. hayden55

    hayden55 Member

    Joined:
    Jan 29, 2017
    115
    48
    0
    Location:
    USA
    Vehicle:
    2010 Prius
    Model:
    N/A
    Must be some sort of custom x gauge they setup. Im just a noob and use the std settings on mine.
     
    #9 hayden55, Feb 6, 2018
  10. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,123
    10,049
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Somewhere around here is a link to a Google spreadsheet with a huge list of codes for Prius-specific gauges for all this.
    Somewhere ...
    ==========
    HERE:


    See also this long thread:
    https://priuschat.com/threads/scangaugeii-work-on-2010.64406
     
    #10 fuzzy1, Feb 6, 2018
    Last edited: Feb 6, 2018
    hayden55 and SFO like this.
(You must log in or sign up to post here.)