GoM *and* Battery Percent

Interesting but aren't you overthinking things a bit?
J

 

Laying awake at nights?

 

Does it show battery 0% when EV range reaches -- zero mile?

 

I have not used this feature myself, but I am wondering how this display of "battery percent-charge number" will make the estimate better. It is true GoM is too optimistic at start and often too pessimistic in a middle, but it always finishes at zero mile left when the battery deplete and ICE kicks in. Meaning at the very end GoM is 100% accurate. Now, if instead I have % battery on display, do I know how much % is needed to drive how many miles under what condition? I am sure if I use it often enough on the same road trip, I get better at making mental calculation, but is it better than GoM??? I think it is still a guesstimation at best. For me, for exactly same road trips with very similar driving condition, EV ranges differ day by day by as much as 5 to 10 miles. I don't think % battery left will equate to known miles of EV by simple arithmetics.

 

Too many variables to ever be accurate. The EV range is calculated by your average miles per kWh. Whether you look at a percentage, the SOC% (on the screen) or looking at the actual SOC% from a scan tool is all the same, some folks will like looking at a percentage or the SOC...

100% on the screen is about 82% actual charge...0% being about 14% give or take 1-2%.

Of course terrain, speed, regenerative braking and climate settings all make a fairly bug impact on your range. For instance, my commute to work is 18 miles on rural roads driving 55-60 MPH with 3 traffic lights. There is also elevation loss and in the morning not really using AC and haven't had the car long enough to use heat. I guess I should say heat pump since that's what it is. Anyway, because of all this I'm using around 3 kWh at most to get to work. On the other hand from a full charge (can't charge at work anymore) leaving work I use 4-5kWh because of the AC and the elevation gain. All in all I get about 30-32 miles in EV and with cooler weather in the afternoon I suspect I will peak out on EV range before going south on the range due to cold batteries and using the heat pump.

Other things that impact my EV range, simply having to stop at a traffic light, or someone pulling out in front of me.

However, it is pretty much like gas, you have a finite amount of "fuel" and various conditions impact, pretty significantly, how far you can go.

Perhaps the range estimate should be more "dynamic" meaning if you start driving it hard, full throttle starts, hard braking that the estimated range should be immediately reduced, rather than a speedy countdown?

As far as hitting the EV/HV button, I've done that a few times and can't say I have noticed a benefit, however your situations may vary. I will say that it does make more sense to run the ICE at highway speeds over driving around residential streets (which I don't encounter on my commute).

 

i have only used the % setting since i got the car and customized it ~8500 miles ago i would prefer to have the % number in the HUD but i cant so instead of the EV range in 2 spots i have the EV range in the HUD and the % there.

it says "--%" when at 0% AKA hybrid mode.

i also have played with hv/ev mode and EV auto. the car never remembers what mode i have it set to and always put me back in EV mode when i turn it on so i just drive in EV mode till the battery is dead then drive in hybrid mode. life's too short. just let the computer drive the car (love radar cruse control )

 

when you purposely kick on the engine because you don't think you have enough miles, but find when you get home that you would have, are you taking into account the fact that the engine warm up has added more miles?

 

During (less than 2 minutes) engine warm-up any model of Prius sets the cylinder firing timing as to not produce any real power (or polution) and uses the traction battery for locomotion until the engine and components are warmed up. Engine warm up drains the traction battery. I have watched cylinder firing timing, traction battery drain, and engine coolent temp on Scangauge II connected to my Prius v.

I have seen reports that the system tries to generate the power lost during engine warm-up back into the traction battery, but I have not seen hard data to verify that.

 

Pardon my ignorance, I’m new here. Can someone tell me what GOM and SOC are?

 

Here you go for future reference:
Glossary – Electric Vehicle Wiki

 

Guess-O-Meter = the approximation of EV miles based on SOC taking into consideration temperature and recent driving history.

State-Of-Charge = the measure of electricity currently in the battery-pack.

 

I don't know about your V or other Prius, but for PRIME, the ICE (and maybe some regen as well) can regenerate the traction battery charge lost during the engine warm-up if I drive long enough. Here is the picture of my PRIME in motion while I was on highway (going 65 mph) after 179.6 miles since the start-up. The level of the traction battery is back to 100%. I had a full charge when I first started the car, but immediately after starting the car, I switched to HV mode to preserve my EV range for later use at the destination. Yes, during the first few miles after the start-up, the traction battery lost some charge. It went down to 96%, but after getting on the highway and driving for a while it went up back to 100%. The SOC stayed above 98% all the way to the destination after ~300 miles of drive on pure HV.

 

Thanks, John. Assume that the SOC would then be the percentage figure available on the HSI screen?

 

Left side = HSI displaying USABLE percentage of battery-pack capacity.

Right side = Aftermarket gauge displaying ACTUAL percentage of battery-pack capacity.