jehan2256
Posts: 4
Joined: Sun Jan 13, 2019 11:05 pm
Delivery Date: 27 Dec 2018

Help me understand my Leaf's acceleration...

Sun Jan 13, 2019 11:34 pm

Hi everyone, I just got myself a used 2011 Leaf in December.

I'm loving the car, but the acceleration is... weird.

If the car is at standstill and I put my foot down, the acceleration gradually ramps up until about 50km/h, where it seems to reach its peak. However, if I'm rolling along at 15km/h and put my foot down, it feels much more instantaneous, which is what I expected the acceleration to feel like on an EV.

So, why is there a difference? Why does the acceleration have a ramp-up when starting from standstill? Is it to prevent wheelslip? To reduce wear and tear? And how exactly is the ramp-up programmed? Is it designed to take a certain amount of time to reach maximum power, or is the available power determined by the current speed?

I'd appreciate any information on this, as Google has not been very useful.

LeftieBiker
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Re: Help me understand my Leaf's acceleration...

Sun Jan 13, 2019 11:37 pm

I'm not as familiar with the 2011 & 2012 cars as the later ones, but assuming you have an "Eco" mode (and I believe you do, but I'm not sure if it's a button or a position on the "shifter") that is probably tuned on, muting the acceleration by remapping the accelerator pedal response. You should get more instant, responsive acceleration in "D" mode.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

jehan2256
Posts: 4
Joined: Sun Jan 13, 2019 11:05 pm
Delivery Date: 27 Dec 2018

Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 12:17 am

LeftieBiker wrote:I'm not as familiar with the 2011 & 2012 cars as the later ones, but assuming you have an "Eco" mode (and I believe you do, but I'm not sure if it's a button or a position on the "shifter") that is probably tuned on, muting the acceleration by remapping the accelerator pedal response. You should get more instant, responsive acceleration in "D" mode.


Nope; this is happening on D mode.

LeftieBiker
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Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 12:26 am

Something similar happens on the 2013+ Leafs because of charges in the motor, but the 2011/2012 Leaf is generally considered to be faster off the line. The only other thing I can think of is worn tires that are triggering the traction control.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

jehan2256
Posts: 4
Joined: Sun Jan 13, 2019 11:05 pm
Delivery Date: 27 Dec 2018

Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 12:32 am

LeftieBiker wrote:Something similar happens on the 2013+ Leafs because of charges in the motor, but the 2011/2012 Leaf is generally considered to be faster off the line. The only other thing I can think of is worn tires that are triggering the traction control.


No difference with traction control turned off.

I noticed this behavior on the other 2011 Leafs that I test drove too, so it's not unusual. Maybe there was a software update which toned down the acceleration? BMW did something similar with the i3.

LeftieBiker
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Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 1:41 am

There was a software update for the early Leafs that reduced regen, but yours seems to be the first report of reduced acceleration.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

jehan2256
Posts: 4
Joined: Sun Jan 13, 2019 11:05 pm
Delivery Date: 27 Dec 2018

Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 2:25 am

Slight update... I've found a thread from 2012 in which the acceleration buildup is mentioned: viewtopic.php?f=38&t=8102

LeftieBiker
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Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 4:07 am

I'm guessing that you either test drove a Tesla, or have some unrealistic expectations for EVs based on the misleading "100% torque at 0 RPM" description of electric car drive motors. It's also attributed to hub motors used in electric bicycles and motorcycles, but believe me, you don't get neck-snapping acceleration from those, either.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

powersurge
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Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 7:52 am

What the original poster asks is basic physics. Of course that from a start, the acceleration is slow. 4000 lbs (Mass) of steel at rest will take time (T) for it to accelerate (A)

F=MA, or A=F/M

So then the car is moving, it takes less force for it to accelerate at a faster rate (pick up). Since Acceleration is measured in Meters / Second(squared).

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Nubo
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Re: Help me understand my Leaf's acceleration...

Mon Jan 14, 2019 10:08 am

jehan2256 wrote:Hi everyone, I just got myself a used 2011 Leaf in December.

I'm loving the car, but the acceleration is... weird.

If the car is at standstill and I put my foot down, the acceleration gradually ramps up until about 50km/h, where it seems to reach its peak. However, if I'm rolling along at 15km/h and put my foot down, it feels much more instantaneous, which is what I expected the acceleration to feel like on an EV.

So, why is there a difference? Why does the acceleration have a ramp-up when starting from standstill? Is it to prevent wheelslip? To reduce wear and tear? And how exactly is the ramp-up programmed? Is it designed to take a certain amount of time to reach maximum power, or is the available power determined by the current speed?

I'd appreciate any information on this, as Google has not been very useful.


Be wary of using a "butt-dynomometer" to determine acceleration rates. :)

There is a slight lull when accelerating from a dead-stop. Imho this (initial slew rate) is done to protect the drivetrain.
I noticed you're still working with polymers.

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