DaveinOlyWA
Posts: 15158
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: Max regen - at what point do mechanical brakes engage?

Mon Dec 09, 2013 3:23 pm

drees wrote:The drastic reduction in regen appears to be a result of the P3227 update and cooler weather. See this thread:

What happened to my Regen?
historical analysis of my regen from day one contributes little to this conclusion. there seems to be less access to the full 30 KW but overall, the numbers are not much different than before.

granted averages covering different days has the normal amount of error which can be considerable especially when there is no effort to duplicate any driving event which is why i took time periods covering several different overlapping periods to see if there was any change and other than the change when i changed driving patterns, there was no significant difference including a periods where my regen levels actually went up after the SW update.

** FYI; all the data used for my study came from Carwings. unlike most of you, i did not get an updated version of carwings so am using the old inaccurate version. but the inaccuracy i have to think is no worse than it was before so for a simple comparison analysis, i felt it ok to use...the other reason is that its the only resource i have with regen data.

now, I also have anecdotal observations which is what is used elsewhere and I too feel that the regen profile is different. as mentioned above there is little doubt that access to the full 30 KW is not as easy as it was before but the cold weather has hampered that as well (keeping in mind the poster above has not had the update)

but wondering if this "hidden" adjustment is related to pack longevity and the ramp up in regen is mirroring the ramp down seen during a fast charge?
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; 14,342.8 mi, 93.16% SOH
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mksE55
Posts: 176
Joined: Fri Oct 21, 2011 8:10 pm
Delivery Date: 22 Oct 2011
Leaf Number: 5086
Location: Tyler TX

Re: Max regen - at what point do mechanical brakes engage?

Tue Dec 10, 2013 9:55 pm

Correct I have not had the Update. I am do to take the car in for the 2nd year service battery check, and likely will get the update. but this is a major change in regen. I was under the impression that it had to be really cold to affect regen. battery pack that day was 57 by the leaf spy program. after some driving and 4 bars showing on battery temp. I have not checked carwings but I will look into this. since my son is driving it more now , I am not sure how accurate that can be since he drives it differently than I ,and does really care about regen/battery driving distance.
Bye Bye Exxon , Shell, Mobil
* 2011 SL
3 bar loss 23,000 mi
in less than 2 yrs
4/14 now 4 bar loss 32,000 just over 2 years

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TickTock
Posts: 1701
Joined: Sat Jun 04, 2011 10:30 pm
Delivery Date: 31 May 2011
Leaf Number: 3626
Location: Queen Creek, Arizona
Contact: Website

Re: Max regen - at what point do mechanical brakes engage?

Wed Dec 11, 2013 5:58 am

mksE55 wrote:Correct I have not had the Update. I am do to take the car in for the 2nd year service battery check, and likely will get the update. but this is a major change in regen. I was under the impression that it had to be really cold to affect regen. battery pack that day was 57 by the leaf spy program. after some driving and 4 bars showing on battery temp. I have not checked carwings but I will look into this. since my son is driving it more now , I am not sure how accurate that can be since he drives it differently than I ,and does really care about regen/battery driving distance.
And I would add that I observe a similar regen reduction in my log files from last December (pre-update). I was at 78% SOH then.

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JPWhite
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Re: Max regen - at what point do mechanical brakes engage?

Wed Dec 11, 2013 10:10 am

mksE55 wrote:Correct I have not had the Update. I am do to take the car in for the 2nd year service battery check, and likely will get the update. but this is a major change in regen. I was under the impression that it had to be really cold to affect regen. battery pack that day was 57 by the leaf spy program. after some driving and 4 bars showing on battery temp. I have not checked carwings but I will look into this. since my son is driving it more now , I am not sure how accurate that can be since he drives it differently than I ,and does really care about regen/battery driving distance.
I've seen significant reduction of regen (one bubble) with a 50F battery, though it was 25F outside. It makes we wonder if the LEAF is taking ambient temps into consideration as well or exclusively in deciding on the regen available.
--
JP White
http://jpwhitenissanleaf.com
2011 Blue SL-e, 132,400 Miles.
Lost 5 Capacity bars
7/18/13 (29,206), 8/25/14 (51,728), 7/12/15 (71.108), 5/12/16 (88,362), 10/17/16 (96,532)
New Battery 12/3/16 (98,956)
2018 Model 3 20,000 Miles.

rmay635703
Posts: 563
Joined: Wed Jan 19, 2011 7:43 pm

Re: Max regen - at what point do mechanical brakes engage?

Thu Sep 14, 2017 10:36 am

On the Chevy volt forum a super user plotted the max regen vrs speed.

Has anyone done this for the leaf?

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