Deathwater
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Leaf Number: 30332
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Re: Extending range of 24kWh Leaf with LeafBox

Tue Feb 21, 2017 10:04 pm

If you would like to test on a 2017 model, Im willing
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2017 Silver Nissan Leaf SL
Ex-2010 Mazdaspeed 3 owner
Growing up is tough

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IssacZachary
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Re: Extending range of 24kWh Leaf with LeafBox

Wed Feb 22, 2017 3:13 am

This is very interesting. I've been shifting into N and coasting a lot. This would do that automatically if I wanted it to?
2013 SL 45,000 miles.
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The Nissan Leaf is the fourth best long distance car for highway driving. >>Best Long Distance Cars<<

VitaminJ
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Re: Extending range of 24kWh Leaf with LeafBox

Wed Feb 22, 2017 9:35 pm

Piro, would it be possible with LeafBox to disable the low speed "crawl" that mimics and automatic transmission so that the car just sits still without pressing on either pedal?
2013 Ocean Blue SV w/ QC and LED
- +0.2 mi/kwh Aeromods
- Leaf Box
- 2lb 5Ah LiFe 12v battery

East
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Leaf Number: 007125

Re: Extending range of 24kWh Leaf with LeafBox

Thu Feb 23, 2017 4:57 am

VitaminJ wrote:Piro, would it be possible with LeafBox to disable the low speed "crawl" that mimics and automatic transmission so that the car just sits still without pressing on either pedal?



Great feature. If possible create something similar as BMW i3 one pedal driving.

bigalfromwigan
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Re: Extending range of 24kWh Leaf with LeafBox

Fri Feb 24, 2017 5:11 pm

Thomas,

I just found your post about the Nissan Leaf range extender. We have a 2011 Leaf with only nine lights on the battery, so I think a range extender would help us a lot. Do you have any of the beta tester modules left? I would like to help you out by testing one in our situation, where the battery is not in the best of health to start with. Do you think there would be any improvement?

All the best for you and your project.

Alan

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IssacZachary
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Re: Extending range of 24kWh Leaf with LeafBox

Fri Feb 24, 2017 7:55 pm

VitaminJ wrote:so that the car just sits still without pressing on either pedal?


Maybe on flat land. But don't try that here in the Rockies. :lol:
2013 SL 45,000 miles.
12 bars until 44,300 miles on June 2, 2017. :D
11 bars current. :)
The Nissan Leaf is the fourth best long distance car for highway driving. >>Best Long Distance Cars<<

VitaminJ
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Re: Extending range of 24kWh Leaf with LeafBox

Fri Feb 24, 2017 8:12 pm

IssacZachary wrote:Maybe on flat land. But don't try that here in the Rockies. :lol:

The Leaf is genius in that regard, it will hold itself in place on hills with no brake input, no matter how steep. The car will sense it's rolling backwards and use motor braking to stop itself. If the forward crawl and be eliminated, there's no reason to think the hill-hold can't be retained.
2013 Ocean Blue SV w/ QC and LED
- +0.2 mi/kwh Aeromods
- Leaf Box
- 2lb 5Ah LiFe 12v battery

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IssacZachary
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Re: Extending range of 24kWh Leaf with LeafBox

Fri Feb 24, 2017 8:50 pm

I see what you're saying. I've noticed that at 0mph the motor seems to be drawing practically no power. But as the car speeds up to about 5mph the motor uses a small but noticeable amount of power, even if you're using your brakes going down hill. Canceling that out might help a little bit in the 1 to 5mph area.

Still I wonder how much the 0mph anti-rollback and the 1 to 5mph crawl are related and separable.

I was just saying you wouldn't want to be in essentially neutral and not use either pedal on a hill.

PS. To hold itself at a stop it's impossible to be using regenerative braking. Even at slow speeds regenerative braking is practically impossible and nonexistent. The Leaf has to apply power to slow the vehicle at those speeds.
2013 SL 45,000 miles.
12 bars until 44,300 miles on June 2, 2017. :D
11 bars current. :)
The Nissan Leaf is the fourth best long distance car for highway driving. >>Best Long Distance Cars<<

VitaminJ
Posts: 357
Joined: Tue Jan 03, 2017 11:46 am
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Re: Extending range of 24kWh Leaf with LeafBox

Fri Feb 24, 2017 9:02 pm

IssacZachary wrote:I see what you're saying. I've noticed that at 0mph the motor seems to be drawing practically no power. But as the car speeds up to about 5mph the motor uses a small but noticeable amount of power, even if you're using your brakes going down hill. Canceling that out might help a little bit in the 1 to 5mph area.

I suspect the power graph thingy isn't 100% accurate, especially at low speeds. As you say, it doesn't report any power being used but clearly at low speeds the car is fighting the brake pedal like a classic automatic transmission. I think it may improve efficiency, especially in stop and go traffic, but mostly I think it's annoying.
Still I wonder how much the 0mph anti-rollback and the 1 to 5mph crawl are related and separable.

Well the electric motor is not at all like a traditional automatic. In a normal auto the idle speed of the engine and the unlocked torque converter cause the car to crawl forward at slow speed based on how the mechanism works (and the car can even roll backwards on a steep enough hill). Nissan just emulated that behavior with the electric motor. There is no reason why behavior >0 RPM has to effect behavior <0 RPM. The motor and all the wheel speed sensors know when the car is doing 0.1mph and -0.1mph, and can adjust the behavior instantly.
I was just saying you wouldn't want to be in essentially neutral and not use either pedal on a hill.

I was literally doing just that last night while sitting in horrible <4mph stop and go traffic for at least 20 miles as all the Californians slid off the side of the highway in 1 inch of snow. I just sat there riding the brake pedal wishing there was no crawl. Then on the uphill sections I crawled up and up and up a few feet at a time without touching the brake pedal, only feathering the throttle. I would like to do that on flat ground too.
PS. To hold itself at a stop it's impossible to be using regenerative braking. Even at slow speeds regenerative braking is practically impossible and nonexistent. The Leaf has to apply power to slow the vehicle at those speeds.

Regen is one thing, but motor braking is completely different. Theoretically, the Leaf can supply the equivalent of 80kw of front wheel "braking" force to cancel out any hill. The limit there is traction of the front wheels (I am not sure if the car will automatically apply the friction brakes to all 4 corners, I suspect not).
2013 Ocean Blue SV w/ QC and LED
- +0.2 mi/kwh Aeromods
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Piro
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Re: Extending range of 24kWh Leaf with LeafBox

Wed Mar 01, 2017 11:31 pm

IssacZachary wrote:This is very interesting. I've been shifting into N and coasting a lot. This would do that automatically if I wanted it to?


Yes, coasting now = just do not remove leg from accelerator pedal, leave it a bit pressed, so LeafBox will understand this and make car coast.
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