ABRP Oddities

[Paul Gipe]

ABRP Oddities

 

Bo, Jason,

 

I am still trying to get a handle on ABRP real time use and accuracy. Here are some oddities I observed recently driving out 2020 Chevy Bolt with Android Auto and Torque Pro.

 

Oddity 1

 

On a short trip 35 miles one way, the opening screen gives the correct SOC  (84%) and estimates arrival SOC (69%). This is a higher estimated SOC upon arrival than the online planner.

 

I arrive at my destination. Torque Pro says my SOC is 63.5%. This is a difference of 20.5 % vs the 15% ABRP estimated in the car before departure.

 

Today when I used ABRP to plan this route both online versions give me 18% SOC to cover this distance—both out and back.

 

Previously, ABRP gave me a much lower consumption estimate: 12% to 16%. Because I started with a low SOC, upon arrival the real consumption was 19% SOC. I was in the middle of nowhere and there was a question whether I had enough SOC to get home. I did, but that was just luck (12.9%).

 

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The return trips were well within ABRP’s estimates. However, outbound actual consumption was higher than the estimates.

 

Oddity 2

 

On the return trip ABRP never plotted the route for 30 of the 35 miles. ABRP says it can’t calculate route and stops processing. During this time I have cell phone reception.

 

During the return, ABRP showed green bars with SOC but the SOC is incorrect as I am monitoring Torque Pro manually as I drive. ABRP does not show a destination SOC because it can’t calculate the route, but the current SOC remains incorrect despite the green bars.

 

Oddity 3

 

The reason I monitored this short trip is that I used ABRP extensively to plan and drive a new route through a very remote part of California and the estimates just didn’t seem right and it affected my confidence. This was a route with no cell phone service, little traffic, and no charge stations.

 

In planning the route I noticed that ABRP’s reference consumption wasn’t anything like what I expected to see (3.5 kWh/mi). This too shook my confidence.

 

The current live reference consumption is 4.54 mi/kWh. This not the EPA or ABRP reference consumption used for planning. It could be my personal reference consumption from the dashboard info.

 

These quirks are affecting how and when I use ABRP.

 

Oddity 4

 

Battery capacity in ABRP for my car is 57.6 kWh from Torque Pro. However, I don’t believe Torque Pro is correct. I think Sean Graham’s formula (algorithm) is incorrect. I’d need to charge the car to 100% for several sessions to get a comparison but before the recall my calculations showed that I had several more kWh that Sean’s formula.

 

Paul

 

 

 

[Hugh-SG]

Gud'afternoon Paul,

Saturday, Feb 26th, 2022 at 13:03 (UTC-8)

I am Not an ABRP staffer, just a long time user.

FYI,... I have a Tesla Model-X and I took noted starting late summer, early fall 2021 that ABRP's calculations went from being spot on accurate, IF you entered correct Outside Temperatures and Road Conditions, to being no longer as accurate.

In my Model-X when I do trips now, my Tesla always arrives several per cent higher in SoC then the ABRP predicts what I will need.

But I would rather have a surplus then risk arriving below 20% and be faced with Supercharging (fast charging) and low SoC state battery.

Food for thought,

Kindest regards,

Hugh-SG

[Paul Gipe]

Thanks Hugh-SG  from downunder. Yeah, we want ABRP to be on the high side by a modest but known amount.

I am taking a  break on commenting on ABRP. Our Bolt has some issues with charge limitation from GM and I am not sure how that affects ABRP.

Paul