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TACC and the Accelerator

Discussion in 'Model S: Driving Dynamics' started by Saghost, Feb 6, 2016.

  1. Saghost

    Saghost Well-Known Member

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    I don't have any experience with Adaptive Cruise, and I was thinking about it during my drive home yesterday and had some questions that I haven't seen answers for yet. Developing answers outside of a lab environment could be dangerous in some cases, and I'm not asking people to experiment - hopefully folks already know the answers. :)

    With normal cruise control, when you hit the accelerator while under cruise the car accelerates as normal, and continues to drive like it wasn't on cruise until it slows back down to the set point.

    Does the car respond to the accelerator when TACC is engaged but there's no traffic ahead? What if it sees a car but isn't locked into following distance?

    Does the car accelerate when you hit the pedal and it has a car that it's following at the set distance? If so, does the Automatic Emergency Braking or TACC kick in and slow you back down at some point? (This is the part that would be dangerous to experiment with.)
    Walter
     
  2. pedriscoll

    pedriscoll Active Member

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    Indianapolis, Indiana
    The TACC responds to the accelerator the same way as conventional cruise control. Manual operation of the accelerator overrides the following distance. As soon as you let up on the accelerator the car will resume the set following distance. AEB operates independent of TACC and would kick in if the car senses an imminent collision. I had this nearly happen once when I was overriding TACC and a car cut close in front of me and slowed down. The red collision warning came on but I hit the brakes before AEB did. I assume it would have had I not.
     
  3. Saghost

    Saghost Well-Known Member

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    Thank you. :)
     
  4. green1

    green1 Active Member

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    Mar 25, 2014
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    Location:
    Calgary, Alberta, Canada
    I'll second what pedriscroll said, I actually use the accelerator with TACC fairly frequently, for example, when overtaking on the freeway while on auto-steer. Not wanting to disengage the auto-steer I use auto lane change and the accelerator pedal.
     

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