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 and becoming a Supporting Member. For more info: Support TMC
Start a Discussionhttps://teslamotorsclub.com/tmc/tags/

Noticed something odd with autopilot

Discussion in 'Model S' started by fasteddie7, Nov 2, 2016.

  1. fasteddie7

    fasteddie7 Member

    Joined:
    Aug 12, 2016
    Messages:
    367
    Location:
    uniontown PA
    Over the past two days I've noticed that twice now my vehicle automatically adjusted speed with the speed limit. I know that it always reduces speed when the speed limit changes but twice now while driving into a higher speed limit Zone the vehicle sped up. It's only happened twice and I can't figure out what is causing the behavior. Anyone else notice this?
     
  2. msnow

    msnow Active Member

    Joined:
    Jul 14, 2015
    Messages:
    4,962
    Location:
    SoCal
    It shouldn't go faster than what you set it for and it should only reduce speed if you've moved from a divided highway or expressway to a restricted road or, of course, when the car in front of you slows.
     
  3. TIppy

    TIppy Active Member

    Joined:
    Jul 8, 2016
    Messages:
    1,021
    Location:
    Tampa, FL
    I've noticed that if you're in a 35mph zone and have autopilot set for 45mph you'll be limited to 40 mph, 5mph above speed limit. If the speed limit then changes to 40mph the new cap is 45mph so the car will increase to 45 mph.
     
  4. JohnnyG

    JohnnyG Weee!

    Joined:
    Jun 24, 2016
    Messages:
    397
    Location:
    Columbus, OH
    @fasteddie7 - You aren't losing your mind, this happened to me twice this past weekend. It is behaving like it had prior to the initial release of v8.0.

    I was travelling on a non-divided highway, speed limit was 40, I had the autopilot engaged and set to 45 (TACC showed "MAX 45"). I entered into a 35 zone, and the autopilot restricted me to 40 (note: the TACC now showed "MAX 40"). I continued on autopilot, and upon entering a 45 zone, my speed increased to 45 (my previous, initial, manual setting) and the TACC now showed "MAX 45" again. Note that I could technically be doing 50, but I didn't previously have it set to 50, I had it set to 45.

    This behavior is exactly how autopilot functioned prior to the initial release of v8.0. The only difference is that in v7.1, it would still let you manually manipulate the speed setting to a higher speed (and display it), even when autopilot was speed restricting based on the speed limit. Theoretically, in v7.1, you could set the autopilot to 90MPH, and it would adjust your speed to 5 over along your whole route as the speed limits changed, with no intervention from you.

    Side note: with this latest behavior, if you try to change the speed setting with autopilot engaged on a non-divided highway, it will not do as described above. It takes that movement of the cruise speed setting as your new setting, even if you were trying to set it to a higher setting, and visually nothing seemed to change.

    Okay, now everyone go try this and report back!
     
    • Informative x 1
  5. JohnnyG

    JohnnyG Weee!

    Joined:
    Jun 24, 2016
    Messages:
    397
    Location:
    Columbus, OH
    @TIppy -- It sounds like you might still be on v7.1. With v8.0, you can't be in a 35MPH zone with autopilot on and set the TACC to 45MPH. It will only allow you to set it to 40MPH. However, you could be in a 40+ zone, set AP to 45, and then drive into a 35 zone, which would then limit you to 40, but as noted above, with initial release of v8.0, it would not then speed you back up once you moved into a higher speed limit.
     
    • Informative x 1
  6. TIppy

    TIppy Active Member

    Joined:
    Jul 8, 2016
    Messages:
    1,021
    Location:
    Tampa, FL
    I'm on v8.0 now, but I can't say for sure which version I was on when I made those observations.
     
    • Informative x 1
  7. fasteddie7

    fasteddie7 Member

    Joined:
    Aug 12, 2016
    Messages:
    367
    Location:
    uniontown PA
    Both times were from 45 to 25 and back
     
  8. green1

    green1 Active Member

    Joined:
    Mar 25, 2014
    Messages:
    4,550
    Location:
    Calgary, Alberta, Canada
    Also a reminder that you can not count on this behaviour because it is only on certain classes of roads.

    It is useful only as Tesla intended it, as a limit to your use of the feature. It is not useful as a feature unto itself because you can't rely on it.
     
  9. MP3Mike

    MP3Mike Active Member

    Joined:
    Feb 1, 2016
    Messages:
    3,631
    Location:
    Oregon
    @green1 I think what people are saying is that Tesla "fixed" this feature as part of the most recent 8.0 build. Such that it remembers your set maximum and then Autosteer adjusts the TACC maximum up to your max set based on the speed limit rules. (Unlike the initial 8.0 that only reduced the set point down, it would never go back up automatically.)
     
    • Informative x 2
  10. green1

    green1 Active Member

    Joined:
    Mar 25, 2014
    Messages:
    4,550
    Location:
    Calgary, Alberta, Canada
    but does it do it on ALL roads? or only "restricted" roads (where you have no idea if a road is restricted until you try)
    That's my point. If it only does it on some classes of roads, it's not useful as a feature, only as a limit.
     
  11. fasteddie7

    fasteddie7 Member

    Joined:
    Aug 12, 2016
    Messages:
    367
    Location:
    uniontown PA
    I have only had the new update for two days now only traveling my normal commute on national highway 40 in pa which goes between divided four and two lanes through residential to long straight aways. I'm going a different route tomorrow so I'll be able to see how it behaves then. Interstates never adjusted down for me, as i don't believe they are supposed to.
     
  12. TIppy

    TIppy Active Member

    Joined:
    Jul 8, 2016
    Messages:
    1,021
    Location:
    Tampa, FL
    I believe the 5mph above posted speed applies to all roads that aren't divided highways.
     
    • Helpful x 1
  13. JohnnyG

    JohnnyG Weee!

    Joined:
    Jun 24, 2016
    Messages:
    397
    Location:
    Columbus, OH
    You can count on it to function as designed. The certain classes of roads are clearly specified in the Owner's Manual (residential roads, a road without a center divider, or a road where access is not limited).
    Tesla intended it as a safety limit; for you AND for those on the roads and sidewalks around you. Why do you say you can't rely on it? If it functions as designed, documented, and demonstrated (not necessarily as you prefer it), then it is reliable. If it where acting randomly, then you could claim it unreliable.

    You know exactly what roads, because it is outlined in the Owner's Manual. Nowhere does it say "restricted". It clearly states "residential roads, a road without a center divider, or a road where access is not limited". As a licensed driver, those terms should be quite clear.
    Again, it was never intended as a 'feature'. It's purpose is a safety limit, to protect you AND others from you.
     
  14. green1

    green1 Active Member

    Joined:
    Mar 25, 2014
    Messages:
    4,550
    Location:
    Calgary, Alberta, Canada
    And I'm sure the car clearly displays to you what type of road it thinks you are on right?

    I've tried the limitation, I chose to disable it. On some divided roads it was restricted, on others it wasn't, on some non-divided roads it was, on others it wasn't. There's no way to know until you try it on that specific road at that specific time.

    Sure, it's mostly reproducible on the same section of road (barring a tile update which it won't tell you that it received) but until you've driven the section of road you don't know.

    It is once again a "safety limit" which actively REMOVES safety. People are using it as an automatic speed adjust, when it wasn't designed to do so, it sometimes unpredictably drops your speed for no apparent reason when it misreads a sign (and sometimes quite aggressively too) quite possibly leading to rear-end collisions, and all the while it does NOTHING to make you any safer than you were before when you actually paid attention to speed limits and the speed of traffic and drove accordingly.
     
  15. TIppy

    TIppy Active Member

    Joined:
    Jul 8, 2016
    Messages:
    1,021
    Location:
    Tampa, FL
    #15 TIppy, Nov 3, 2016
    Last edited: Nov 3, 2016
    I have had it drop me down from 50 to 25 abruptly when it read a school zone speed limit during a time when it shouldn't have been enforced.
     
  16. bradhs

    bradhs Member

    Joined:
    Oct 14, 2013
    Messages:
    329
    Location:
    San Diego, CA
    If this is true, thank god... I miss this from the 7.1 days.
     
    • Helpful x 1
  17. Brunton

    Brunton Pontificating the obvious

    Joined:
    Jun 27, 2014
    Messages:
    356
    Location:
    Summerville SC
    Good! I really missed this 7.1 behavior in 8.0!
    If you're in the slower zone and take the car off autopilot by jerking the wheel, does it speed back up to what you set? It used to do this, which is a potential safety issue.
     
  18. GlmnAlyAirCar

    GlmnAlyAirCar Member

    Joined:
    Mar 19, 2015
    Messages:
    726
    Location:
    Gilbertsville, PA
    This is actually different (and, IMHO) better than in 7.1.

    In 7.1, on "restricted" roads, you could set the TACC (with autosteer activated) to any speed desired. However, the actual speed would be capped at the greater of either the selected speed or the speed limit +5mph.

    In the current build of 8.0 (2.42.40), the behavior IS a little different. On restricted roads, if you attempt to set the TACC (with autosteer activated) to anything greater than the speed limit, it will cap it at the speed limit+5. Period. Except, now, when the speed limit increases, so will the TACC speed, even if it is greater than the speed you were traveling when it was originally set. In this build, it is truly following the speed limit.

    In the original 8.0 builds, TACC speed would never increase on its own.

    Note that this only applies to restricted roads with autosteer activated. On unrestricted roads, or without autosteer, it will still continue to hold the speed you set.
     
    • Informative x 2
  19. GlmnAlyAirCar

    GlmnAlyAirCar Member

    Joined:
    Mar 19, 2015
    Messages:
    726
    Location:
    Gilbertsville, PA
    No, because it no longer "remembers" the speed that was set prior to engaging autosteer.
     
  20. green1

    green1 Active Member

    Joined:
    Mar 25, 2014
    Messages:
    4,550
    Location:
    Calgary, Alberta, Canada
    So it ignores the speed you told it to do and accelerates beyond that? That sounds like an extreme safety risk!

    Keep in mind this is the car that half the time has no clue what the actual speed limit is.
     
    • Disagree x 1

Share This Page