douglasteeple
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Leaf Number: 7049

3D GPS, Cruise Control

Sat Feb 18, 2012 9:57 am

First, apologies if my suggestions overlap existing entries, I have read the forum ad did not find exactly these points.

First, I would realy like a more accurate % of charge display. The bars are too course-grained and I find a whole bar drop near the lower end of charge somewhat disturbing.

I live in a very hilly (actually mountainous) area, thus prompting the next suggestions.

GPS maps show the world as flat, something I think was disproved some time ago. The range of the LEAF is very dependent on hills. I have observed that climbing 0.5 miles up (and 10 miles forward) is about equivalent to 50 flat miles. 3D GPS maps would permit better estimates of range, taking in to account the vertical component.

Cruise control could be hooked into regeneration. When I am going down that steep hill, and I ask the cruise control to hold me at 45, it could push hard on regeneration to keep me at 45. At the moment there is no connection between cruise control and regeneration, so even with cruise control my speed creeps up beyond what I have set it at.

DaveinOlyWA
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 10:03 am

the GPS issues will be self resolved as you learn your Leafs capabilities and limitations. as far as a CC setpoint, you can only do so much against gravity. regen helps but it is limited.

for the range; there are solutions like Garygid's SOC meter that breaks estimated charges into a 281 point scale. the latest firmware update from Nissan is also supposed to make the range estimates more accurate as well.

i do have the former, have not done the latter yet
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 11,333.1 mi, 93.73% SOH
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garygid
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 10:14 am

1. the SOC-Meter gives about 280-step "fuel" resolution instead of the LEAF's 12-step resolution.

2a. The data for 3D GPS is available, but few "need" it, so only a few have written suitable programs. Elevation gain/loss is only one of many "Range" variables.

2b. 10 miles up 2600 feet equal to 50 flat miles? I suspect that around 20 or 25 miles is closer.

3. The CC does slow the LEAF using Regen, I believe. Perhaps you need more Regen due to steep grades? Can one use ECO mode's greater Regen with CC?
See SOC/GID-Meter and CAN-Do Info
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TonyWilliams
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 10:17 am

Nissan is working on integrating elevation into their range algorithm. I personally spoke with one of the engineers working on the project. It won't help current LEAFs much, however.

I don't use the GuessOmeter at all, and whatever improvement would be (potentially) just less wrong. I'm scheduled to have my car updated Monday.

Have you had a chance to check out the range chart linked on my signature line?

jkirkebo
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 10:43 am

garygid wrote:3. The CC does slow the LEAF using Regen, I believe. Perhaps you need more Regen due to steep grades? Can one use ECO mode's greater Regen with CC?
Yep, sadly the regen available in CC mode is tied to driving mode. So shifting to eco will give the CC more regen to work with.

In my opinion, CC should be able to command all the regen possible, regardless of driving mode.

DaveinOlyWA
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 10:53 am

CC setpoints are tied too much to the setpoint itself.

regen will slow you down but common sense is what is needed here. if you know you are starting a steep decent and you want to average 45 mph then you need to set CC to 40 mph or less.

CC will not let you go below your setpoint but gravity can push you beyond regen's ability to slow you down TO YOUR SETPOINT

i see this on the Oly hills which are not steep by any real sense nor are they very long. the road to downtown has a decent grade, steep enough to run you 5-10 mph past your set point.

now braking occasionally will slow you down or increase regen but then you have to restart CC.
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 11,333.1 mi, 93.73% SOH
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garygid
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 11:01 am

I think it is good that ECO gives the CC more Regen to work with.

Unless it turns on the brake lights, you probably should
not have the use of Strong Regen.

But, it would be nice for CC to have the ability to do more Regen
(with brake lights), for long, medium-speed, downhill stretches.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
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DaveinOlyWA
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 11:25 am

garygid wrote:I think it is good that ECO gives the CC more Regen to work with.

Unless it turns on the brake lights, you probably should
not have the use of Strong Regen.

But, it would be nice for CC to have the ability to do more Regen
(with brake lights), for long, medium-speed, downhill stretches.
feedback i have received from driving in Eco mode is that brake lights do not come on unless you engage the brake pedal. have had dozens of co-workers tell me i should check my brake lights.

i normally drive all the way to work without touching the brake pedal except to stop when pulling into my parking space.

this could be construed as a safety issue on flat ground but anyone going down a steep hill who is not paying very close attention to the speed of a car in front of him... either way, maybe having brake lights come on at a certain level of regen might not be such a bad idea ?
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 11,333.1 mi, 93.73% SOH
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garygid
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 12:14 pm

I think, for better Safety, the EV should turn ON
the brake light at ANY Regen level.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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dgpcolorado
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Re: 3D GPS, Cruise Control

Sat Feb 18, 2012 1:28 pm

garygid wrote:I think, for better Safety, the EV should turn ON
the brake light at ANY Regen level.
That would mean brake lights on the whole way down a hill. Doesn't having brake lights on all the time lose the startle factor that warns the following driver of a speed decrease?

Using mild regen going down a hill is similar to descending a hill in a lower gear in an ICE car, the usual technique used by any competent driver on hills. (The rule-of-thumb is that one descends the hill in the same gear as is used to climb the same grade.) As it happens, the Eco regen slows the LEAF quite a bit less than third gear on my ICE cars; I wish it could be dialed up a bit so I can reduce my speed going down those grades without having to use brakes.

Descending a grade in a lower gear or using regen doesn't involve slowing if the grade is relatively constant, so there is no need to warn following drivers with brake lights. It is only the sudden change in speed that needs brake lights, IMHO.
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