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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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