Featured Ioniq refuses to go up an incline during a review.

Discussion in 'Prius, Hybrid, EV and Alt-Fuel News' started by UsedToLoveCars, Mar 19, 2016.

  1. UsedToLoveCars

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    gas pedal becomes unresponsive.

     
  2. Tideland Prius

    Tideland Prius Moderator of the North
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    Interesting response to the situation. Mashing the gas pedal would not have been my first reaction if the car was rolling down an incline.
     
  3. mrbigh

    mrbigh Prius Absolutum Dominium

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    A gallon of gasoline would serve the purpose forever..............and a match. :censored:
     
  4. Ashlem

    Ashlem Senior Member

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    Wow, hope that was just a fluke that Hyundai can fix before they start selling it.
     
  5. Paradox

    Paradox Prius Enthusiast / Moderator
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    Ioniq, the car to drive, if you live in west Texas. :rolleyes:

    For those scratching their heads, it's flat out there, lol.
     
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  6. Dion Kraft

    Dion Kraft Member

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    Interesting thread about what happen....

     
  7. UsedToLoveCars

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    has to be... though it doesn't inspire confidence.


    Merged


    As it is rolling to a stop, I might do that. Then the panic sets in...
     
  8. Sergiospl

    Sergiospl Senior Member

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    Emergency brake? most cars do not come with hand brake anymore!
    upload_2016-3-19_20-39-14.jpeg
     
  9. SlowTurd

    SlowTurd I LIKE PRIUS'S

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  10. Tideland Prius

    Tideland Prius Moderator of the North
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    Yeah but he was jabbing it after it rolled to a stop. I know he panicked. I'm just saying that for the benefit of others who are reading this thread, if it's on an incline, use the brakes or parking brake. If it was on a flat, that's fine. Cause if there was power, you'd just spin the tires or if TCS still works, it might just cut the power again.

    Yeah but the new Elantra still has a handbrake. The Ioniq probably has a foot brake.
     
  11. Jeff N

    Jeff N The answer is 0042

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    It looks like the driver slows the car to a stop on the incline using the brake pedal or at least keeps his foot hovering over the brake pedal as the car slows and then he tries to use the accelerator after the car begins to roll backwards.

    Presumably the engine is not running and the car was running on the hybrid battery and then the gas pedal was pushed hard enough as the car began to roll backwards that the gas engine needed to be started to provide enough power.

    I'm a little uncertain of the powertrain design, but with only a single motor and no torque converter (I think) between the gas engine and motor and the transmission I guess they have to unclutch from the transmission, use the motor to spin the engine rpm up, start the engine, and clutch it all back in. It's probably tricky to do that dance when the car is going backwards. Perhaps the car cannot respond fast enough to prevent the driver from panicking at the apparent lag in engine response?

    With a two motor system you have more flexibility.
     
    #11 Jeff N, Mar 19, 2016
    Last edited: Mar 19, 2016
  12. bisco

    bisco cookie crumbler

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    i'm sure they'll figure it out eventually. after all, it's just a prototype...
     
  13. Trollbait

    Trollbait It's a D&D thing

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    That sucks, but why did they have a camera in the footwell?

    PS: from Reddit,"He said it happened earlier with his daughter on the passenger seat. So he called the camera crew to see if he could recreate it again. They happened to caught it on camera."
     
  14. austingreen

    austingreen Senior Member

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    Looks like a software bug. I'm sure they will fix it;)

    It's pretty straightforward. Double clutch transmission is mated to a motor then cluched to the engine. Just think of it like a manual that's automated, but 2 clutches are used to shift faster between even and odd gears. This is clutched to a motor then the engine, instead of just clutched to the engine.

    The tricky part. When the engine is off and more power than the motor can provide is requested the starter, starts the engine, then speeds up to the rpms the motor is going then clutches in.

    The problem that is likely going on here is the motor should really declutch because of the slow speed, cluch to the engine, then the motor should reclutch in first gear to give proper power. The low rpm is a problem. In a manual you might apply the brake too when you are slowing like this driver. In toyota hsd the brakes are applied insted of regen bellow 7 mph. Its a complicated dance. My guess is the battery is low, and they hadn't worked out this low rpm, incline stuff, with regen, and maybe some traction conrrol slips as well. Without looking at code I am only guessing but it seems to be a logical place to apply brakes instead of regen, then act as if its a fresh start, insead of a rolling start.

    The sonata hybrid uses a traditional automatic transmission so the software would be different.
     
  15. hill

    hill High Fiber Member

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    this close to production? hopefully they're way beyond prototype, at this junction. Is there a reliable source for how long ago this happened? .
     
    #15 hill, Mar 21, 2016
    Last edited: Mar 21, 2016
  16. bisco

    bisco cookie crumbler

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    i haven't seen anything, when does production start?
     
  17. austingreen

    austingreen Senior Member

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    My guess is as soon as they finish working out the bugs. I thought it was around october for the hybrid and later of the phev and bev, but if they still have this bug I would wait ;-)

    My guess is its not serious. That really looked like a typical software bug. Then again the japanese and koreans seem to be worse at software than US, so it may take them longer than I think it would take an american team. It is a Do NOT ship type bug, but hardly one that would be difficult to fix if my guess at what is happening is happening. Its much more repeatable and theirfore easier to fix than the toyota software bug in braking that the gen III buyers got.
     
  18. telmo744

    telmo744 HSD fanatic

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    Wild and broad shot.
    Forgot the magic software performed by europeans (those wicked hackers) that US teams did not detect soon enough :)
    Also when looking at the gen III braking case, you forgot that the driver could in fact brake the car, applying further force at the pedal...which in this Ioniq didn't work (pedal to the metal and car coming backwards!) and presents a safety issue.
    Prius software has been long in the tooth, very few issues to adress, you are making the forest out of the tree.
    JP software profficiencies are no less that american ones, MS windows granted! :whistle:
     
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  19. Sergiospl

    Sergiospl Senior Member

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    Thanks, for not guessing! :)
     
  20. Jeff N

    Jeff N The answer is 0042

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    Reportedly, Hyundai has issued a recall on the existing Ioniq's for a software update and all cars built after March 14 already contain the update. That seems like a quick response to the original report from CarMedia which seems to have gone out on March 9 but perhaps they had been talking to Hyundai before they published.
     
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