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Adaptive cruise control

Discussion in 'Model S: User Interface' started by silasoverturf, Sep 26, 2014.

  1. silasoverturf

    silasoverturf New Member

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    Saw this knob on my cruise control stock. Pending feature?

    ErQo2Vw.jpg
     
  2. spentan

    spentan Active Member

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    Interesting,

    I wonder if there are many other changes apart from the sensor at the front.

    This is the only feature that I really really want, I would pay up to 10k to get this functionality, (retrofit),

    Otherwise, looks like I'll have to buy a demo/2ndhand one with it already on it.
     
  3. DJung

    DJung Member

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    Maybe a fulfillment of Elon's vision of autonomous driving? Can't wait to see what's next with all these new sensors going in.

    "I'm confident that in less than a year, you'll be able to go from highway on-ramp to highway exit without touching any controls" - quote from Elon (June 2014)
     
  4. Saghost

    Saghost Active Member

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  5. shadowinstallz

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    Bummer....I just took delivery on 9/20.....I don't have the new sensors or that stalk.... 2yby2e6e.jpg
     
  6. anticitizen13.7

    anticitizen13.7 Enemy of the Status Quo

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    Are the new sensors and controls part of the technology package?
     
  7. RDoc

    RDoc S85D

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    The real question is how close will this let you get? Drafting has been shown to significantly help with power usage and, with the car's computer watching the vehicle in front, why not follow very closely? If by chance a state trooper took exception, I'm sure that a quick explanation would clear up the misunderstanding.
     
  8. AmpedRealtor

    AmpedRealtor Active Member

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    Because using ACC doesn't change braking distance, and your question is a perfect example of how people are going to stupidly rely on this feature thinking that it is a substitute for having common sense and a basic understanding of physics. If you are drafting a big rig and that big rig slams on his brakes because of something up ahead, you think ACC is going to miraculously save your butt when you are following less than a car length behind? You don't need ACC in this instance, as the big rig itself will prove to be a sufficient stopping force for your vehicle. Unfortunately, by the time your S comes to a complete stop, you and all of the occupants in your vehicle will likely be dead.

    But hey, you saved 10 Wh/mi.
     
  9. spentan

    spentan Active Member

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    Why you mad tho?

    I'm pretty sure if a truck slams on its brakes, the Tesla could probably stop quicker anyway.

    The main thing to consider is reaction time, which if the ACC system is good, it won't be an issue.

    Also having had ACC in my 4 previous cars, 1 car length is the minimum it will let you get in terms of distance. (most of the time I ride with 2-3 car lengths at least)
     
  10. highedu

    highedu Member

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    AmpedRealtor is right....the Model S cannot override the laws of physics. Reaction time will help but depending on other factors such as how fast both vehicles are going, distance between vehicles, etc if you draft too close with ACC on you will lose
     
  11. Raffy.Roma

    Raffy.Roma Active Member

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    Don't agree. If the ACC is well designed it will prevent you from getting too close to the vehicle in front of you even you try to do it, unless you switch off the ACC of course. When the ACC is on it overtakes the will of the driver if such a will doesn't respect the safety rules.
     
  12. highedu

    highedu Member

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    if the logic is setup that way then of course you will not encounter the situation. I believe the scenario we were commenting on was the one where you can set the distance otherwise
     
  13. tom66

    tom66 Member

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    Does ACC use brakes? On most cars it can only decelerate... on Model S it might be able to use regen as well but that would not be significant enough to brake strongly.
     
  14. SCDrJ

    SCDrJ Member

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    It's all speculation at this point... ACC systems are using radar and cameras to achieve their functions depending on the car. Mobileye for example if you read their site has some cars with camera-only ACC. Does that mean the radar is just for emergency braking? Both? Hard to say... I bet even if the MS ACC doesn't access the brakes it will be more responsive than average since it could use regen to assist rather than coasting. They are loading the car up with the tech to do a lot - what they do with it, only time will tell. Just hoping my car coming Monday has it!
     
  15. bollar

    bollar Disgruntled Member

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    Other ACC systems, such as the Mercedes Distronic, do use brakes and can bring the car to a complete stop. Distronic Plus will use 40% braking if it believes a collision is imminent and can apply 100% braking if the driver doesn't respond to an audible warning. It uses a combination of stereo cameras and radar to do this.
     
  16. ItsNotAboutTheMoney

    ItsNotAboutTheMoney Active Member

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    BMW's system will brake gradually but it also has collision avoidance so in case of need for rapid deceleration it will alert the driver and primes the brakes to improve braking by the driver.

    Of course Tesla doesn't have collision detection, ACC or blind spot detection yet because there's a smaller margin of error, I expect, than with LKA and speed assist, so it'll take longer to ensure it's right.

    - - - Updated - - -

    I was reading a summary of a study that suggested a well-designed system would need to be tolerant of high volume situations and speed variations and actually allow temporary close distances at times to allow merges.
     
  17. Raffy.Roma

    Raffy.Roma Active Member

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    No the distante is set by the ACC according to your speed, the weather conditions and the road situation.

    - - - Updated - - -

    Don't think so. If I was the designer of an ACC system I wouldn't tolerate anything but that the specs to guarantee your safety were respected. The ACC has got to be efficient.
     
  18. ItsNotAboutTheMoney

    ItsNotAboutTheMoney Active Member

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    If you're designing ACC you have to take into account the people behind you and normal human behavior. If you want safe following distance you can set a nice interval of 4s, but what do you want your car to do when a bunch of people merge or change into your lane? Do you want it to slow down immediately? Or do you want it to allow time for those drivers to get up to speed or pull off while still ensuring that you'll not get very close? Because if you want it to slow down you're going to be braking a lot and the people behind you, who have anticipatory abilities slower but more advanced than ACC are going to be annoyed at the excessive braking at every entrance and exit.

    It doesn't mean that ACC would allow a setting of less than 2s, but it's not as simple as having it maintain a minimum 2s at all times.
     
  19. Raffy.Roma

    Raffy.Roma Active Member

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    Don't agree. The ACC doesn't consider differently cars in front of you that are changing into your lane or not. It slows down immediately and always let you stay at a safe distance. The ACC can warn people behind you with flashing lights but doesn't care if they get annoyed at excessive braking.
    The features that you are mentioning could belong to a semi-autonomous driving system not to an ACC IMO.
     
  20. Hootgibson

    Hootgibson New Member

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    We picked up our car three hours ago and were shocked to find that it has adaptive cruise control. I wasn't even aware that this was a part of the package. Our delivery specialist didn't even know how it works. He told us to read the manual.
     

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