drees wrote:<snip>Hx appears to be a representation of the packs' internal resistance<snip>
(although I think you may be right that the loss of regen is related to pack resistance).
Well, there you say that
Hx is proportional to both ESR (internal resistance) and SOH (capacity remaining).
EVerlasting wrote:Nissan screwed our original regen with the software update and haven't bothered to fix it. They never mentioned anything about changes to regen in their software update announcement literature, otherwise I wouldn't have got it done. Until we force them to rectify this software error through a legal battle, someone please find the darn sensor to disable that will restore full regen. Thanks.
So how many people have actually complained about this? I complained during my last visit to the dealer - but that didn't get anywhere. Anyone else take it to the EV hotline or perhaps Facebook? Perhaps if enough of us did all 3 we might get some traction.
As far as working around the issue, I see a couple possibilities:
1. Spoofing the battery temp sensors to read significantly hotter than it actually is.
2. Spoofing/intercepting CAN bus messages so that the car thinks that more regen is available either through modifying Hx, or some other message. I don't know enough about how this works to know if it's feasible. I think ideally we'd probably reprogram one of the ECUs, but this would take reverse engineering the Nissan Consult software, firmware flashing process and firmware.
mynameisjim wrote:I can add a data point for temperature. I use a heated garage in the winter so there are days when my car is 60 degrees but the ambient is much lower and my regen is severely limited. I think the car uses outside air temperature for this calculation based on my experience. I will have 5 battery temperature bars.
Very interesting. I wonder if some safety feature kicks in once you fall below freezing to ensure traction control can do it's thing if you hit a sheet of ice.
Should be easy to verify by logging the available regen parameter and other various parameters.