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Why the lever for PRND?

Discussion in 'Model 3' started by Ryan H, Apr 3, 2016.

  1. Ryan H

    Ryan H Member

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    Does anyone know why they use a lever for PRND? Since the indicator is shown on the touchscreen, I think it would be easy enough to use that as a selector as well.
     
  2. igotzzoom

    igotzzoom Member

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    Might have something to do with the FMVSS code.
     
  3. Az_Rael

    Az_Rael Active Member

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    I haven't researched the laws, but I know a lever isn't required. We test drove a new TLX, and it just has buttons for the drive mode.

    image.jpeg
     
  4. igotzzoom

    igotzzoom Member

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    Yes. A mechanical connection is no longer required, but I'm wondering if a "physical" actuator is still required. Even in the newer Lincolns, they're depressable buttons.
     
  5. Ryan H

    Ryan H Member

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    #5 Ryan H, Apr 4, 2016
    Last edited: Apr 4, 2016
    I don't see anything about a physical actuator. *shrug*

    I guess it just surprises me that with the removal of so many physical knobs and switches that the legacy of the PRND lever remains.

    eCFR — Code of Federal Regulations
     
  6. MileHighMotoring

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    You don't want it on the touchscreen. Period. If the screen reboots, you can't put the car in park, or drive, or neutral, or anything, for 30-60 seconds (or more). That would be a catastrophically bad idea.

    You want this set of controls utterly separate from the infotainment system.
     
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  7. ecarfan

    ecarfan Well-Known Member

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    Agreed. Of course Tesla could have used buttons as they did on the Roadster 2.0/2.5 cars, but for something you want to be instantly accessible for safety reasons, a lever is better because it is faster and easier to operate than separate buttons.
     
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  8. Ryan H

    Ryan H Member

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    I hadn't considered the screen going blank while driving. Since the lever isn't mechanical though, how would you confirm that the desired mode was reached? It is my understanding that putting the car in park sets the parking brake. Is there an audible sound to confirm that the car would be placed in park?
     
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  9. Candleflame

    Candleflame Member

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    parking is triggered by pressing a button. Lever up Forwards, Lever down reverse. Very intuitive.
     
  10. Ryan H

    Ryan H Member

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    Umm... isn't it the opposite of that?
     
  11. Mishakim

    Mishakim Member

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    This is an endless debate on Leaf forums, where I'm coming from. In the Leaf, it's a joy-stick like puck, with forward for reverse and backward for forward (sideways for neutral, button for park, or just turn the car off for park). About half, including me, think it should be reversed. I'd say the same for a lever on the column - I find up for forward and down for reverse to be natural, but people used to driving an automatic transmission expect reverse to be up from drive, even though they're both down from park, which is different from electrics where park is usually a button and the rest position of the shifter is centered. In a manual, of course, the direction of reverse varies from model to model, but forward gears are in both directions.

    This makes me think of the debate a few years ago when Apple reversed the direction scroll wheels work, to match touchscreen gestures. I like it, others hate it, especially if they have to switch between Windows and Mac since Windows is still the other way.
     
  12. Ryan H

    Ryan H Member

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    The order and position of gears is included in the standard in my link above. I guess they could put the lever on the left to put drive above reverse :)

    S3.1.1.1 Transmission shift levers. If a steering-column-mounted transmission shift lever is used, movement from neutral position to forward drive position shall be clockwise. If the transmission shift lever sequence includes a park position, it shall be located at the end, adjacent to the reverse drive position.
     
  13. yesup

    yesup Member

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    It's reverse.
    I didn't see if they are using the same one as Model S and Model X.

    Model S and X uses Mercedes stalk control for gear selection, indicator/wipers, steering wheel adjustment etc
     
  14. Jason Bourne

    Jason Bourne Member

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    In the Model S, since it has a gauge cluster, I think there is a visual indicator there. So maybe if the Model 3 has a HUD, it might show there.
     
  15. Ryan H

    Ryan H Member

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    I understand that. My point was that if the screen blanks out as MileHighMotoring was suggesting (and by extension the HUD), there would be no way to confirm the change in mode.
     
  16. mrElbe

    mrElbe Member

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    The whole steering wheel assembly is sourced from Mercedes, that is why the gear selection stalk and cruise control stalk.
     
  17. Jason Bourne

    Jason Bourne Member

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    The center huge display can blank out. I don't think the gauge cluster can. They are two different things in two different locations (in the S).
     
  18. Ryan H

    Ryan H Member

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    That's fine, but this is in the Model 3 forum.
     
  19. Ryan H

    Ryan H Member

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    Interesting. So the whole thing could be different for the Model 3 since Elon pointed out that the steering system they showed in the prototype is not the one that will be used.
     
  20. igotzzoom

    igotzzoom Member

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    Was on the Model S. Doesn't necessarily have to be for the 3. Will be interesting to see what the final production configuration will be.
     
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