Is the i3 using hold mode or coast mode when you stop?

[UpNorth]

Evening i3 people

I’m in week 2 of ownership of my new 2019 i3s BEV.

I also have a Tesla model 3 that has something called ‘hold mode’ to stop the car rolling forward for back when the car gets to 0 mph. My brain is very accustomed to this.

It feels like the i3 is doing something different. A bit like ‘creep mode’ in a Tesla,

In the i3 when your are in drive (D) and come to a stop, the car is prevented from rolling back, right?

But when in drive (D) the car can still coast forward like an automatic transmission car. So you use your brake to hold the car from moving forward.

Have i got that right? Is that what’s happening?


Is the car just free rolling forward like in neutral? Or is there still regen resistance. I can’t quite tell.

Can these settings be adjusted?

Thanks

 

[kd7iwp]

I believe the i3 uses the motor to hold you at a stop when you come to a stop on an incline. If it’s flat it just sits in neutral and if there is a slight incline it will roll. On the pre facelift i3 I believe that it uses brake pressure from the traction control system to hold you on a hill (similar to my E61) and the facelift versions use the motor to hold you.

This is from documentation on the facelift model.

 

[alohart]

In the i3 when your are in drive (D) and come to a stop, the car is prevented from rolling back, right?

Correct, but maybe not if the incline is too steep. I can recall being stopped on an incline when our i3 suddenly rolled back a bit before stopping as if gravity had overcome the holding force.

But when in drive (D) the car can still coast forward like an automatic transmission car. So you use your brake to hold the car from moving forward.

Correct. I pull up on the parking brake switch rather than continuing to press the brake pedal (and potentially dazzling the driver behind me at night). The parking brake releases automatically when the power pedal is pressed, so there's no need to press down on the parking brake switch before proceeding.

Is the car just free rolling forward like in neutral? Or is there still regen resistance.

It's just rolling forward like being in neutral. i3's have such low rolling resistance that a tailwind can cause our i3 to roll forward while stopped on a level road.

Regen shouldn't be enough to stop an i3 completely or to prevent it from rolling. The regen power decreases as the rotational speed of the propulsion motor decreases with decreasing forward speed. The rolling resistance isn't high enough to stop an i3 completely. I can hear when our brake pads are clamping down on our rusty rotors, so I'm pretty certain that the friction brakes aren't used to come to a complete stop. I'm guessing that when regen power decreases at low speeds, a little reverse power is applied to the motor until it stops rotating. Forward power is applied to the motor to prevent an i3 from rolling backward while stopped in 'D'. Reverse power might be applied to the motor to prevent an i3 from rolling forward when in 'R' (not sure).

Can these settings be adjusted?

I'm not aware of any way to adjust this behavior.

 

[Dutchi3]

Forward power is applied to the motor to prevent an i3 from rolling backward while stopped in 'D'. Reverse power might be applied to the motor to prevent an i3 from rolling forward when in 'R' (not sure).

True. My i3 got hill-hold as an early update, before that it was not yet implemented. So if you have the lever in D, you will still roll off a hill forward, but not backwards. In reverse, the behaviour is also reversed. That is all...