New SE Observations

Discussion in 'MINI Cooper SE' started by drdunkyn, Jun 20, 2022.

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  1. drdunkyn

    drdunkyn Well-Known Member

    WRT the roll. It is incline-dependent, indeed. The amount of "idle" power forward isn't sufficient to keep it from creeping backwards on moderate inclines, such as my short driveway (<10deg). It's not a full unimpeded roll, but definitely such that if you don't maintain the electrons it will continue moving backward. On less steep grades it will roll back just a couple inches. If you apply the friction brake, it WILL hold that when you come off to prevent rollback. I guess I don't mind it as it keeps me practiced using the brake when driving ICE. And yes, I ONLY drive in the strong regen mode.
     
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  3. Rexsio

    Rexsio Active Member

    My act the same and I’m assuming this is correct way
     
  4. CrazyLegs17

    CrazyLegs17 New Member

    First time, long time here... I've been lurking for a couple months since I bought a like-new used 2022 MINI SE in SoCal. I love to crowdsource information and troubleshoot. I'm also the kind of nerd who reads instruction manuals cover-to-cover in hopes of finding every hidden setting and option.

    I found it interesting to see that folks have experienced roll with the vehicle on inclines. There are two sections I recalled from the owner's manual:

    Drive-off assistant
    Concept
    This system supports driving off on uphill grades. The parking brake is not required.
    Driving off with the drive-off assistant
    1. Hold the vehicle in place with the foot brake.
    2. Release the foot brake and drive off without delay.
    After the foot brake is released, the vehicle is held in place for approx. 2 seconds.


    I confirmed this worked for me when driving home from the airport. There is a steep incline near a railroad crossing. I used to two-foot the pedals in the old car to prevent the car from rolling backwards. With the SE I was able to just let off the brake pedal and accelerate away.

    The other section is more general:

    Hold function
    Concept
    The system holds the vehicle automatically when gear is engaged. This prevents rolling against the direction of travel. In selector lever position D, the vehicle cannot roll backwards. In selector lever position R, it cannot roll forward. The brake pedal does not have to be pressed.
    Reducing energy consumption
    To reduce energy consumption when the hold function is activated, activate the parking brake or engage the selector lever in position P when the vehicle is stopped for long periods of time.
    The hold function can be affected by the vehicle's load and the road incline. If needed, a Check Control message will appear and position P will be selected automatically.


    If the brake is never actuated after a complete stop, perhaps the incline is too steep for the hold function to work in the manner of the drive-off assist.

    I look forward to continuing to learn and many miles of happy motoring. Cheers!
     
  5. drdunkyn

    drdunkyn Well-Known Member

    Yep, exactly as I said, my use-case does not include use of the brake pedal. A moderate incline is able to overcome the forward force from an SE that has decelerated using high-level regen braking, and car slowly glides backwards. I thought I was just providing helpful insight, but as it seems I'm in the minority of people trying this on an incline I'll make a video tomorrow. It really is simply a matter of real-life use! I appreciate that you made the effort of reading the manual thoroughly, and it's interesting they make note of a "hold function" -- that does seem to be active when the car is near-level or only on a slight incline, but not with the mildly increased inclines I've experienced. I wonder if the "hold" carries more force with an ICE? As far as I'm concerned, I really only would be bothered by the lack of Drive-off assistant, which I have found extremely helpful for YEARS!!
     
  6. Puppethead

    Puppethead Well-Known Member

    I tested my 2021 SE on my driveway that has almost a 20% grade, and sat with feet off the pedals for over two minutes. The SE did not roll backwards in the slightest.
     
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  8. Torrey

    Torrey Active Member

    Did you drive forward into that position and simply take your foot off the accelerator without using the brake?
     
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  9. Puppethead

    Puppethead Well-Known Member

    Yes, exactly what I did. High brake regen was on.
     
  10. Brian Beuchaw

    Brian Beuchaw New Member

    Mine's a 2022, I use high regen and when I'm in drive and let off the accelerator and it comes to a stop without using the brake pedal on an incline, it will roll backwards, but only a couple of inches, certainly not enough to have the camera come on, and it will hold it there for the few minutes it takes the light to change.
     
  11. drdunkyn

    drdunkyn Well-Known Member

    It's just an "observation", folks, not sure why the need to prove me wrong... Anyway, here's a video of my experience.
     
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  13. Puppethead

    Puppethead Well-Known Member

    My apology if you feel that way, it was never to doubt your experience. It's different behavior from other SEs, and it's instructive to discuss the nuances. I wonder if maybe your SE has slightly different components due to the chip supply issues and that's why the behavior is different? Or you have a unicorn SE that gives it a unique personality?
     
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  14. drdunkyn

    drdunkyn Well-Known Member

    No worries...also, I guess I forgot to mention my Iconic Unicorn special edition. :p I thought everyone had that!!
     
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  15. insightman

    insightman Well-Known Member Subscriber

    I've alway wondered how the SE uses its motor to hold the car stationary on a hill. I wonder what part of your SE is functioning differently than in our non-Unicorns? What component could be responsible for your unique, slight delay? I assumed the system uses the wheel-position sensors to determine if the SE is rolling, but if those were defective, you'd be experiencing additional problems. Now that I think about it, your wheel-position sensors appear to be detecting your SE rolling in reverse based on the activation of the rear camera. The explanation is beyond my experience.
     
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  16. drdunkyn

    drdunkyn Well-Known Member

    That's just the thing -- I actually liked the roll-back on a steeper incline, if for no other reason that it's a little reminder to use the brake. What I found interesting was that any roll-back triggered the back-up camera to switch on. It rolls a couple inches on lesser inclines but still wakes up the camera, but stays put very quickly.
     
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  17. revorg

    revorg Active Member

    Don't forget one of the rules of the road - all Mini's are unique. Apparently, they're unique in many different ways.
     
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  18. GvilleGuy

    GvilleGuy Well-Known Member

    Yes - absolutely believed your assertion of the rolling backward, @drdunkyn . Some of us just like to dig in on these differences and try to figure out the 'why the heck is that happening?'. I'm glad you reported it.
     
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  19. Puppethead

    Puppethead Well-Known Member

    I did more testing of this in my 2021 SE, both high and low regen. I took my foot off the accelerator on an incline similar to @drdunkyn's and my car stopped without going backwards. The backup camera did not activate. I then shifted into neutral and rolled backwards, still no camera. My backup camera only activates when I shift into reverse.
     
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  20. insightman

    insightman Well-Known Member Subscriber

    Your experiment makes @drdunkyn's SE even more mysterious!
     
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