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Kermit68

Some data to fine tune existing alpha model

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Hi, last weekend I had some spare time that I used to run some consumption test with my I Pace (20" wheels, no pano roof, air suspension) that I would like to share as it could be useful to fine tune the existing ABRP I Pace model.

The test was a 300 km roundrip made of 3 legs (each way) of motorway @130 km/h, country roads @95 Km/h speed with some 600 m elevation gain and a final mountain road at variable speed from 40 km/h to xxx km/h with another 1100 m elevation gain. Temperature from 29C (motorway) to 16C (mountain top), no air con. Started fully charged and got back home with 9% left.
Very little traffic in the motorway so the car was running @130 km/h as set in the cruise for 99,9% fo the time.

Useful data I can report are:

- using a value of 245 Wh/Km @110 Km/h in ABRP I get a consumption estimation very much in agreement with the real data (about 1% more) and over 300 km I think it'a pretty good result and confirms the genral experience of I Pace owners that reference consumption acutally proposed as default (271 Wh/Km @110 Km/h) quite excessive.

- average consumption of 262 Wh/Km @130 Km/h measured over a 52 km leg (50m elevation loss, so close to negligible).

If helful I can report exacly my trip but I don't know how to do it: save the tirip in ABRP and share it or just a screen shot?

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@Kermit68 - The best way to tackle this, if you're so inclined, is to go for a drive on some flat road, and drive 10-20 minutes at each given speed, resetting your trip odometer for each and recording the efficiency.

If you can give me a few data points, for example:

  1. 30km/h
  2. 60km/h
  3. 90km/h
  4. 120km/h
  5. 150km/h (If safe)

That would be sufficient to define the range a little better.

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Ok, it's not an impossible task. My main problem is to find a flat path but once spotted not too far from my home it's feasible. Even @150km/h, tecnhnically speaking it's not legal in Italy but I would be a laier if I'd say I never drived the I Pace (or my motorbike) at that speed ... 😉

I'll get back to you with some numbers soon.

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10 hours ago, Kermit68 said:

Ok, it's not an impossible task. My main problem is to find a flat path but once spotted not too far from my home it's feasible. Even @150km/h, tecnhnically speaking it's not legal in Italy but I would be a laier if I'd say I never drived the I Pace (or my motorbike) at that speed ... 😉

I'll get back to you with some numbers soon.

Sounds great! I ought to put a section in the OP to ask for consumption info at different speeds, then people can knock one or two out and we can get a full model.

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Hi Jason, as promised I have some data for you. First some extra info:

  • all data collected after battery warm up (no less than 20 km run before starting the measurements)
  • all data have been collected at external temperatures between 29C and 31C, no air con on (it got a little hot in the car but I wanted "clean" data)
  • all data refers to an I Pace equipped with 20" summer tires and air suspensions (it is supposed to make some difference compared to spring coils above 105 km/h as with A/S the car lowers to improve efficiency)
  • all data have been collected on a loop path or corrected for minor elevation gain / loss (always less then 20 meters) using the formula E =m*g*h where E is the energy used/gained for elevation gain/loss, m = 2200 kg (estimated mass of the car), g = 9,81 m/s2 and h elevation gain / loss in meter. The result has been diveved by 3.6 E06 to convert from Joule to kWh.
  • I also measured the difference between odometer speed and real speed using a Garmin GPS

Here are the numbers:

Reported average speed Real average speed Consumption

Km/h                                Km/h                      W/Km

28                                      26                           127

60                                      56                           126

90                                      86                           181

120                                   115                          252

149                                   144                          354

I also have some extra data to get a better estimation of the real speed / measured speed (km/h) : 130 = 124 and 50 = 47

Final consideration: I'm pretty confident on the measues at 60, 90, 120 and 150 Km/h while for the 30 km/h my number can be not so accurate. I could not find a flat or semi flat road where I could drive @ 30 Km/h safely around Rome, so I had to comprimes a little bit and the number I report has been measure on a 2.5 km path, kind of short ...

Please let me know if you need more info from me.

Ciao

 

Edited by Kermit68

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On 9/11/2019 at 2:47 AM, Jason (ABRP) said:

Sounds great! I ought to put a section in the OP to ask for consumption info at different speeds, then people can knock one or two out and we can get a full model.

Hi Jason, did you have the time to give a look to the data I posted a few days ago?

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On 9/20/2019 at 4:03 PM, Kermit68 said:

Hi Jason, did you have the time to give a look to the data I posted a few days ago?

Thanks for the reminder, I added that into my model, and it was a very nice fit! Improved the curve by a lot (loses more range at high speeds than I originally estimated), though it did improve the reference consumption by 10Wh/km (1kWh/100km).

If anyone else would like to contribute similar data points I think we're getting close to bumping the I-Pace model to Beta.

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11 hours ago, Jason (ABRP) said:

Thanks for the reminder, I added that into my model, and it was a very nice fit! Improved the curve by a lot (loses more range at high speeds than I originally estimated), though it did improve the reference consumption by 10Wh/km (1kWh/100km).

If anyone else would like to contribute similar data points I think we're getting close to bumping the I-Pace model to Beta.

I'm glad the data were useful. I'll post on the UK and Italy I-Pace forum that you're looking for more data, I hope you'll gahter more.

One question about planning: since there is a difference between indicated speed by the odometer and the real speed, how I'm supposed to manage this when planning using ABRP? For example, if I set the reference speed in ABRP to 100% for planning, then on the highway where speed limit is 130 km/h should I set the cruise to 130 or to 137 which is the settings that actually makes me travel at real 130 km/h?

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On 9/10/2019 at 3:42 PM, Jason (ABRP) said:

@Kermit68 - The best way to tackle this, if you're so inclined, is to go for a drive on some flat road, and drive 10-20 minutes at each given speed, resetting your trip odometer for each and recording the efficiency.

If you can give me a few data points, for example:

  1. 30km/h
  2. 60km/h
  3. 90km/h
  4. 120km/h
  5. 150km/h (If safe)

That would be sufficient to define the range a little better.

Sorry for not exact data  but maybee my examples of driwing will help.

I have Ipace  FE , and alreaday 16 600 Km - AVG  25 kWh/100km (there was no winter time and realy few rain)

Temperature between 10-30°C

Last 4800 AVG 70 km/h avg 24,3 kWh/100 Km

Some trips

18°C Prague - Brno / Highway  211 Km AVG 100Km/h -- 28.5 kWh/100 Km

25°C HW 71 km AVG 97   -- 24,5 kWh/100Km

23°C Road 68 Km AVG 68 km/h -- 22,1 kWh/100km

25°C COMB 80%HW  108 km  AVG 91 -- 24,3 kWh

30°C HW 112 km AVG 106 km/h  -- 30,10 kWh

 

 

Edited by Adame

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19 hours ago, Jason (ABRP) said:

Thanks for the reminder, I added that into my model, and it was a very nice fit! Improved the curve by a lot (loses more range at high speeds than I originally estimated), though it did improve the reference consumption by 10Wh/km (1kWh/100km).

If anyone else would like to contribute similar data points I think we're getting close to bumping the I-Pace model to Beta.

Jason, I have some doubt about highway consumption after you updated the model. I simulate a trip from Rome to the Ionity station in Valdichiana Outlet village, 178 km. Based on the updated model I should get there with 28% SOC left. My experience was I got there with 36% SOC, AC on all the time (ext. temperature 38C), total trip time 1:44 vs the 1:41 planned, so very comparable. Are you sure about the corrections you made with my data?

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We intentionally add 10% buffer to the efficiency over actual data for all cars to account for normal variations in conditions, which would account for the 8%point difference.  It should be a better match to your actual consumption than before, as before the suggested reference consumption was a little higher (less efficient).

I'll add in @Adame's data when I have some time and see if I still get similar results.

Of course, if anyone wants to get more data points at highway speeds (the faster the better) that would help refine that region of the curve.

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