Miles to Go Estimator seems worse after upgrade

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wescom

Member
Joined
Feb 26, 2011
Messages
7
Well, I thought that the upgrade would improve this "Miles to Go" estimator. But no.

Driving at 35 mph, flat road, no AC or heat, Eco mode, (pretty much best case) I see the "Miles to Go" estimator drop by ~ 2.5 - 3 miles for each odometer mile driven!!

This is in California, 50 F - 65 F. I charge to 80% capacity as recommended by Nissan.

I really don't see why this meter would be so bad! It really should not be so far off. The knowledge of the battery discharge curve is well known, the new software update has been in place for four weeks.

Any ideas? Thanks!
 
wescom said:
Well, I thought that the upgrade would improve this "Miles to Go" estimator. But no.

Driving at 35 mph, flat road, no AC or heat, Eco mode, (pretty much best case) I see the "Miles to Go" estimator drop by ~ 2.5 - 3 miles for each odometer mile driven!!

This is in California, 50 F - 65 F. I charge to 80% capacity as recommended by Nissan.

I really don't see why this meter would be so bad! It really should not be so far off. The knowledge of the battery discharge curve is well known, the new software update has been in place for four weeks.

Any ideas? Thanks!

I had exactly the same thing for the singular time I used the GoM after the update a few weeks ago. Similar conditions to you, absolutely the easiest conditions to make an estimate, and instead, it stuck on 26 miles to go for 6 miles, and then dropped like a rock.

I covered up the GoM again.
 
After a few weeks of driving it over a route I know well and had good numbers for before the latest upgrade, it now appears obvious that the change is that they have shorted the integration period for the GOM. Thus, the GOM numbers now go up and down faster and over a shorter period than they did before.
 
A GOM will never be accurate, until it is designed to estimate future driving.

The LEAFs, will never do that.

IMO, you are wasting your time moaning and bitching,

Use the GOM, for the limited information it provides.

Personally, I am dreading the GOM update, and every future one, since it will never provide any real improvement, only make obsolete the (useful history of driver's observations of) GOM performance, under the previous settings.
 
do you realize that no amount of updating will allow it to PREDICT THE FUTURE??

after getting the SOC meter, i really dont look at it so cant say that its better or worse. i do glance at the battery bars occasionally
 
Oh yes - it can predict the future. But for that - one needs to put in the destination and using the geography, traffic conditions Leaf can calculate the range. I guess this will come a few years hence, though. But only because it can't be easily done by a 3rd party now.
 
edatoakrun said:
A GOM will never be accurate, until it is designed to estimate future driving.

The LEAFs, will never do that.

IMO, you are wasting your time moaning and bitching,

Use the GOM, for the limited information it provides.

Personally, I am dreading the GOM update, and every future one, since it will never provide any real improvement, only make obsolete the (useful history of driver's observations of) GOM performance, under the previous settings.


I tend to agree that the GoM will never be accurate, but that doesn't preclude making it MORE accurate than it is. Right now, it's just crazy, even when the existing conditions remain into the future. Thats not predicting the future; just using already established data, that isn't being used too well.

The next generation of GoM (and maybe not from Nissan) will, no doubt to me, include traffic and topography, temp, road conditions, etc, to develop a really plausible range prediction, based on where you tell it you want to go.

There's no technical reason it can't be so.
 
DarkStar said:
They really need to just change it to a % of SOC meter and be done with it... I reset my odometer after every full charge and can do math. :D

To appeal to a mass market, beyond early adopters, many of which hold technical education and jobs, will not be with anything that requires math!!!!

Heck, aren't we some double digit ranking in the world now for math and other sciences, and quickly spiraling down?

My wife, for example, will not do math. Neither will my mother. And limited range vehicles need something beyond a simple gas gauge for mass adoption.
 
TonyWilliams said:
edatoakrun said:
A GOM will never be accurate, until it is designed to estimate future driving.

The LEAFs, will never do that.

IMO, you are wasting your time moaning and bitching,

Use the GOM, for the limited information it provides.

Personally, I am dreading the GOM update, and every future one, since it will never provide any real improvement, only make obsolete the (useful history of driver's observations of) GOM performance, under the previous settings.


I tend to agree that the GoM will never be accurate, but that doesn't preclude making it MORE accurate than it is. Right now, it's just crazy, even when the existing conditions remain into the future. Thats not predicting the future; just using already established data, that isn't being used too well.

The next generation of GoM (and maybe not from Nissan) will, no doubt to me, include traffic and topography, temp, road conditions, etc, to develop a really plausible range prediction, based on where you tell it you want to go.

There's no technical reason it can't be so.

If you are willing to input your precise destinations and route, no.

But there is also, not really any reason it should be necessary, to have what will always only be, a more "plausible" range estimate.

It is only the present, very limited public charge infrastructure, causing the present range prediction fixation, of BEV drivers. And having a more precise range prediction, is of no use, if there are no charge points within the variable range.

So, I certainly hope, by the time you get a less inaccurate GOM, you won't need it, anymore.
 
edatoakrun said:
So, I certainly hope, by the time you get a less inaccurate GOM, you won't need it, anymore.

I'm not sure if too many chargepoints will come before an industry accurate GoM.

There are places in the USA that never got cable Tv, for instance (I lived in one).
 
edatoakrun said:
A GOM will never be accurate, until it is designed to estimate future driving. The LEAFs, will never do that. IMO, you are wasting your time moaning and bitching,
I disagree. I've been driving another EV for about a week now, and I can categorically confirm that Leaf's GOM is absolutely terrible. I've done some fairly extensive range testing for the reverse SOC meter project, and I will do a plot showing just how inaccurate the GOM is even in ideal conditions one of these days. In the upper SOC range, its erratic behavior borders on a practical joke, and in the lower SOC range, the GOM keeps nagging and scaring drivers and passengers alike.

That being said, I wouldn't let the perfect be the enemy of the good. The GOM can be improved, there is no question about it. The car should also include an accurate SOC meter for those that would like to use it, and don't mind doing some mental math. Yes, once all EVs have 100 kWh packs, this problem will diminish in significance. However, we are not there yet.
 
TonyWilliams said:
DarkStar said:
They really need to just change it to a % of SOC meter and be done with it... I reset my odometer after every full charge and can do math. :D
To appeal to a mass market, beyond early adopters, many of which hold technical education and jobs, will not be with anything that requires math!!!!
Heck, aren't we some double digit ranking in the world now for math and other sciences, and quickly spiraling down?
My wife, for example, will not do math. Neither will my mother. And limited range vehicles need something beyond a simple gas gauge for mass adoption.
This is a great post. I think Nissan can do it just as GM did it very well for the Volt. I want the Leaf to be successful and I think this will help them get beyond early adopters. The normal masses would want to fairly accurate.
 
Probably just a coincidence, but for the first time, after the last bar disappeared, I only had about 5 miles to Turtle at 60mph. When I left downtown Los Angeles, it quickly told me I had 31 miles range to do the 30 mile trip. Limped into the garage on Turtle Mode at the 30 mile point. First time the range has been that accurate and that the reserve after the last bar disappeared seems to have been reduced since the upgrade unless a coincidence.
 
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