DrInnovation
Well-known member
edatoakrun said:DrInnovation said:...I monitor my Volt with an OBDII.. and my raw SOC levels (something like gids) has not changed in 14 months..
SNIP
I don't follow what you are saying.
Do you get a report of the SOC level, and is that of total battery capacity, or only of that fraction of total capacity available to you?
Or, are you getting a report of kWh, either that stored in the total battery capacity, or the amount of kWh which will be made available to you?
The SAE J1979 standard say the OBDII PID 01 5B should return the current hybrid battery level in terms of absolute capacity of the pack. It is a fixed point value with 0=zero capacity, 255 = full capacity. Lets call the value returned by that PID the value A.
In convert it to raw battery SOC% by taking (100*A/255). Since the full pack is rated at 16kWh, I can get raw kWh by (16.0*A/255).
In watching it I can see the actual range used (86 is the normal max, and at 21 and the ICE is running). (though I've see 87 a few time in the summer). 86-21 is is 65% and consistent what we've heard is "usable" in the Volt.
I have formula for torque for my usable battery wich is (100*A/255-21)*100/65.