Re: new program for monitoring charge readings
Posted: Wed Mar 27, 2019 9:56 am
Mitsubishi Imiev Electric Vehicle Forum
DBMandrake wrote:In these conditions Canion reports 4.075 - 4.085 volts (correct) and Hobdrive beta's 88 cells page reports values from 3.95 - 3.98 volts. (incorrect) It's simple knowledge that 3.95 volts is not a fully charged lithium Ion battery as these cars charge the cells to exactly 4.1 volts, so 3.95 - 3.98 cannot be correct.
I don't know how you're calculating the voltages but for my 2011 Ion they are simply wrong and do not agree with the official Peugeot diagnostic tool. The error seems to be greater at low state of charge. The calculation in previous versions of Hobdrive was correct.
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?
This is a problem that needs to be answered before anyone will have confidence in the app or the data.
DBMandrake wrote: ... it's only the 88 cells page (which shows all cells on one page instead of per CMU) that is incorrect.
coulomb wrote:DBMandrake wrote: ... it's only the 88 cells page (which shows all cells on one page instead of per CMU) that is incorrect.
I believe that he needs to multiply those values (ignoring the decimal point) by 5 (for 5 mV per sample), and add 2100, to get the result in mV.
For example, 397 x 5 + 2100 = 4,085 mV = 4.085 V.
396 x 5 + 2100 = 4,080 mV = 4.080 V.
These then agree with the other page.
The problem is that some of the values come from the CMU, and others from the BMU, and I believe that they are encoded differently. I have no idea why the encoding differs.
[ Edit: corrected typos, 4,095 mV → 4,085 mV; 4.095 V → 4.085 V. ]