TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

Brake Light Animation?

Discussion in 'Model S: User Interface' started by mattreidy, Dec 2, 2014.

  1. mattreidy

    mattreidy Member

    Joined:
    Oct 29, 2014
    Messages:
    63
    Location:
    Richmond, VA USA
    I've seen posts about being able to see brake lights on/off animated on the car info screen shown after tapping the Tesla logo in the center of the display but my car has no light animation on that screen. The only lights I see animated are on the control/setting screen, but it doesn't include brake lights... Am I missing something or did this change at some point? I'm running 6.0
     
  2. markb1

    markb1 Active Member

    Joined:
    Feb 17, 2012
    Messages:
    2,318
    Location:
    San Diego, CA
    Used to work in the older software, but they removed it at some point.
     
  3. mattreidy

    mattreidy Member

    Joined:
    Oct 29, 2014
    Messages:
    63
    Location:
    Richmond, VA USA
    So now there's no way to tell if the brakes lights are on other than rear camera in the dark?

    I'm just a week into ownership and still trying to get a feel for when they come on without hitting the pedal.
     
  4. cgiGuy

    cgiGuy Member

    Joined:
    Jul 9, 2013
    Messages:
    983
    Location:
    Sacramento, CA
    It's still visible on the charge screen.
     
  5. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,763
    Location:
    Texas
    Usually it's 15 kW on the regen scale.
     
  6. markb1

    markb1 Active Member

    Joined:
    Feb 17, 2012
    Messages:
    2,318
    Location:
    San Diego, CA
    Perhaps that's how it works out on level ground, but it's not tied to the amount of regen. For instance, there's a hill I regularly drive on, and I generate 30 kW while maintaining speed downhill. The brake lights do not come on in this case. This is also evidence that it's not tied to an accelerometer. I think it's most likely triggered by a certain amount of change in the RPM.
     
  7. mattreidy

    mattreidy Member

    Joined:
    Oct 29, 2014
    Messages:
    63
    Location:
    Richmond, VA USA
    I see it there. Thanks!
     
  8. Todd Burch

    Todd Burch Electron Pilot

    Joined:
    Nov 3, 2009
    Messages:
    4,734
    Location:
    Smithfield, VA
    It's not tied to regen power.

    15 kW of regen at high speed (say, 60 mph) is not much deceleration, so they don't come on there. At 20 mph, 15kW is quite a bit of deceleration and they will come on.

    Rather than thinking of it in terms of regen power, try to get a feel for the amount of deceleration that sets them off. Soon you'll be able to predict it reliably enough to not prematurely trigger the brake lights.

    And, by the way, welcome to the club! Nice to see another Virginia Model S!
     
  9. cgiGuy

    cgiGuy Member

    Joined:
    Jul 9, 2013
    Messages:
    983
    Location:
    Sacramento, CA
    But maintaining 30 kW while maintaining speed downhill wouldn't trigger an accelerometer, would it?
     
  10. Blu Zap

    Blu Zap Grinning member

    Joined:
    Oct 1, 2014
    Messages:
    441
    Location:
    San Rafael, CA
    Good info. I'll try that one. I always wondered how I can monitor the brake lights!
     
  11. JBusch

    JBusch Member

    Joined:
    Nov 17, 2011
    Messages:
    62
    Location:
    Fort Worth, Texas
    +1 had my car 3 months and still fine tuning when the bake lights get displayed.
     
  12. markb1

    markb1 Active Member

    Joined:
    Feb 17, 2012
    Messages:
    2,318
    Location:
    San Diego, CA
    I think it would. Think about when you brake, you are pulled forward out of your seat. If your car is pointed downhill, gravity is pulling you forward out of your seat. The accelerometer would feel the same thing.
     
  13. Todd Burch

    Todd Burch Electron Pilot

    Joined:
    Nov 3, 2009
    Messages:
    4,734
    Location:
    Smithfield, VA
    As markb1 indicated, I believe this is determined not by a true accelerometer, but instead by sensing the rate of change of RPM/wheel speed.
     
  14. BlueTan85

    BlueTan85 Member

    Joined:
    Jul 21, 2013
    Messages:
    339
    Location:
    Earth
    At night I just leave the live rear video screen on, and marvel, then cringe, at how often the brake lights go on and off and on and off as I do the slightest acceleration/deceleration-regen as traffic conditions warrant. I can only imagine what the driver behind me is thinking -- geez, this guy is brake-happy.... etc....
     
  15. marchyman

    marchyman Member

    Joined:
    Nov 17, 2014
    Messages:
    37
    Location:
    San Mateo, Ca
    Acceleration is defined as a change in velocity over some time interval. Going down hill at a constant velocity is not acceleration. Going downhill at a constant speed, on the other hand, might include some acceleration. Speed is not velocity. Speed is a scalar value. Velocity is a vector value. A change in direction is a change in velocity even though your speed might be the same. That confused me no end in high school :)
     
  16. markb1

    markb1 Active Member

    Joined:
    Feb 17, 2012
    Messages:
    2,318
    Location:
    San Diego, CA
    That's one definition of acceleration. But accelerometers measure g-force (proper acceleration) not change in velocity (coordinate acceleration). At constant velocity, you still experience 1 g from gravity, and an accelerometer will detect that.

    Accelerometer - Wikipedia, the free encyclopedia
     
  17. artsci

    artsci Sponsor

    Joined:
    May 10, 2012
    Messages:
    4,680
    Location:
    Timonium, Maryland
    Watching your brake lights is a great tool for smoothing your driving technique in heavy traffic and mastering the use of regen to avoid strong deceleration that turns on the brake lights. I try to drive so the brake lights only come on when the guy behind me is following too close or there's a need for a hard stop owing to what's going in front of me.
     

Share This Page