kiev wrote:i think what is puzzling to everyone is why do the BMU and CMU voltages not match up exactly--there is about 0.100 volts difference between the two for the same cells.
Which value is correct, and why is there an indicated difference in the readings?
The BMU values (min voltage and max voltage) are correct and match Canion and Diagbox. The individual cell values in the 88 cell screen are incorrect. The error is actually much greater than 0.1v at a lower SoC, as I showed in my earlier screenshots.
The formula to calculate the cell voltages on the 88 cell screen was correct in the last stable release of Hobdrive but is wrong in the current beta releases. I hope Serhge will revert to the old calculation which has been proven to be correct.
I think Serhge is skeptical of the values reported by Canion however I have a Diagbox/Lexia 3 official dealer diagnostic tool of my own which says (at least on my 2011 Ion) that Canion reports exactly the right individual cell voltages (within 5mV) while current Hobdrive beta builds are way out and read too low.
Perhaps early and later model cars use a different calculation - this could be a source of confusion and error among those trying to reverse engineer the formula to calculate the voltages from the PID values.
This is a problem that needs to be answered before anyone will have confidence in the app or the data.
This is my concern as well. Most of the data reported in Hobdrive is correct (apart from the 88 cell voltages in current beta builds) however I have noticed a few individual parameters that are incorrect or have very implausible readings. When I get time I'll compile a list of the parameters with questionable accuracy by comparing them to my Diagbox unit.