How linear is our i-miev battery gauge when driving?

[joev]

How linear is our i-miev battery gauge when driving?

I would like to get an idea what others are averaging per bar on their battery gauge and is it linear?
I’m referring to the 16 segment gauge to the left in the instrument cluster.

Scenario:
Fully charged battery (or 80 % if that is what you charge to).
Trip odometer set to zero.
Similar driving conditions for each bar of the gauge (as close as possible).
As each bar is used note miles or km gone for that bar (could be tricky to catch it as it drops).
Obey all traffic rules and drive safely.

HERE ARE MY TYPICAL MILES PER BAR FROM FULL CHARGE:
Note: Most of my driving is on the same roads at low speeds, flat terrain.
1st bar 7.8
2nd 7.5
3rd 7 and the rest, 5.5 to 6
Of course these are approximates over many trips.
What are yours??? Thanks!






 

 

[garygid]

It would be nice if we/you could Log these parameters and plot them.

When we get the Logging working on the iMiEV, it will be a lot safer
than trying to watch the gauges to catch a bar-transition.

 

[Don]

Unless you could drive a straight, flat road at a steady speed through one full charge, I think it would be impossible to get a handle on how linear the gauge is, because with every stop and restart, every hill, every slow for a turn and then reaccelerationg, your energy usage isn't linear, so that would skew any attmept to measure things bar by bar. Even trying my best to keep it as steady as possible, the amp draw needle on my car is all over the place in normal usage and it's a given that if the amp gauge is moving, the usage per bar is moving with it

Because the energy usage varies so much depending on what I'm doing, I don't see where knowing how linear the gauge might or might not be would be of any meaingful use to me. I actually never look at the fuel gauge when driving . . . . at least never until the RR gauge gets down near single digits

Don

 

[BillThompsonMIEV]

I agree with Don. I keep track of the miles used per bar upon recharging the vehicle. If I used 12 bars and drove 60 miles, that would equate to five miles per bar. In my case so far I have averaged about 5.15 miles per bar.

 

[garygid]

With the ability to log the battery voltage and current,
and multiply the two to get an value for "instantaneous"
power, we can integrate the power to get the energy used,
and see if the indicated Bars represent equal energy steps.

 

[MLucas]

With the ability to log the battery voltage and current,
and multiply the two to get an value for "instantaneous"
power, we can integrate the power to get the energy used,
and see if the indicated Bars represent equal energy steps.

That is so cool, this is what we are looking for in MiEV-CAN gauge.