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garygid
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 1:40 pm

Until we know more, we do not even know what this
data is, much less what to call it.

"Guess-o-Cap" (Capacity)?
"Tick Byte"?

Perhaps try to relate it to data that we know better:
What are %GIDs saying after a "full" charge?
See SOC/GID-Meter and CAN-Do Info
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TickTock
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 1:51 pm

Turbo3 wrote:Now the hard part. What do we call it? If we make this health what do I call the old one? Do you think we need both?
By the old one, are you referring to hlth(LeafSpy)/H(leafDD)/Xfactor(CANary)? I personally think that until we know what it represents, the old value should be called something ambiguous (like Xfactor ;)) and 5B3:D2 should be given the SOH moniker. I think it is still useful to continue to watch the other value since it does seem to be tracking degradation of something and one day it may be interesting but right now it is telling me my leaf is at <50% and I cannot find anything that has degraded that much - even my series resistance is still reading in the 90-100mOhm range.

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TickTock
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 1:55 pm

garygid wrote: What are %GIDs saying after a "full" charge?
I does roughly track gids/281 - about as closely as Ah. It is *really* (within 1%) close to Ah/65.6.

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garygid
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 2:08 pm

Assuming this CA:5B3 D2>>1 "Tick-Byte" has significance,
any idea what values would be significant?

Assuming that this is capacity or "health" related,
then higher would be better and lower would be worse.

But, would 62% (if it is a percent at all) be reasonably
good for a 30 month old car, or bad?

Assuming your car has lost significant battery capacity,
but your car still shows 12 bars, it seems that the
Capacity Bars are lagging, lying, or both, right?
See SOC/GID-Meter and CAN-Do Info
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2011 LEAF, 2014 Tesla S85
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garygid
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 2:21 pm

If the battery internal resistances is N initially, then
M later on (larger), a way of expressing the degradation
would be N/M as a percentage, where 50% would mean
that the resistance has doubled (M = 2*N).
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
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GregH
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 2:53 pm

TickTock wrote:
Turbo3 wrote:Now the hard part. What do we call it? If we make this health what do I call the old one? Do you think we need both?
By the old one, are you referring to hlth(LeafSpy)/H(leafDD)/Xfactor(CANary)?
How about just Hx..
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TickTock
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 3:02 pm

Probably the main value that has significance is 70% since this is the threshold for battery replacement. Hopefully noone will be looking at numbers much below that for long. My memory may be playing tricks on me but I am pretty sure this value was labeled "SOH" (i.e State of Health) on the test instrument. It represents the % remaining of the spec capacity.
garygid wrote:Assuming this CA:5B3 D2>>1[ snip-I don't think we need a new name] has significance,
any idea what values would be significant?

Assuming that this is capacity or "health" related,
then higher would be better and lower would be worse.

But, would 62% (if it is a percent at all) be reasonably
good for a 30 month old car, or bad?

Assuming your car has lost significant battery capacity,
but your car still shows 12 bars, it seems that the
Capacity Bars are lagging, lying, or both, right?
Bars definitely lag - I am right on the edge of losing my 4th bar based on my capacity (200 gids after 100% charge, 70% SOH, 47Ah) but I am still showing 11 bars. I was showing 12 bars for two months after the reset. The bars did the same thing the last time they reset me in 2012 (took 3 months to get back down to the 10 bars I went in with).

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TickTock
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 3:02 pm

GregH wrote:
TickTock wrote:
Turbo3 wrote:Now the hard part. What do we call it? If we make this health what do I call the old one? Do you think we need both?
By the old one, are you referring to hlth(LeafSpy)/H(leafDD)/Xfactor(CANary)?
How about just Hx..
Works for me.

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garygid
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Re: LEAF CANbus decoding. (Open discussion)

Fri Oct 04, 2013 4:33 pm

If it is really the Capacity, it should be CAP, rather than "health", right?

The BAD news:
One must lose 4 bars to be eligible for the new capacity warranty, right?

Lose 1st at 85% (approximate values) 11 showing
lose 2nd at 77.5% 10 bars showing
lose 3rd at 70% 9 bars showing
lose 4th at 62.5% 8 (less than 9) bars showing.

So, the warranty kicks in when you lose the 9th bar, at
8 bars showing, or about 2 months after 62%, not 70%, right? :o
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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TickTock
Posts: 1701
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Re: LEAF CANbus decoding. (Open discussion)

Sat Oct 05, 2013 5:54 am

On a different topic, I started looking for an embedded timestamp on the canbus this morning. Although SOCmeter, CAnary, etc do add timestamps based on the uC RTC clock, I wanted to read the time as viewed by the car. Particularly because I have a few log files with bogus uC timestamps due to the coin battery getting removed, etc and it would be nice to figure out exactly when I took the log. Also, Gary is reporting significant slowness on the RTC and needs to set the clock frequently so we could use this to auto-sync the uC clock. I am pretty sure canbus messages 5fa, 5fb, and 5fc are some sort of timebase. 5FA is constant for most logs but changes day to day so potentially a date. The upper 5 bits of the third byte seem to return the day of the month. 5fc seems to include a seconds*4 counter in the second byte and minutes in the 3rd. 5fb is also sent along with 5fa and 5fc twice a second but haven't figured out anything useful there. I'll keep puzzling this out, but thought I'd ask if anyone else has already looked at these and decoded them.

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