Electric Range Estimation Algorithm

drlonline · 07-27-2018, 10:05 PM

Does anyone know exactly how the i8 calculates the electric only range estimate? With my 2019 coupe, it typically shows ~ 30 miles when fully charged. I've previously had it show as much as 38 miles when the car was just a few weeks old. Today, I took the car into the mountains, using Sport mode going up and e-Drive coming down. Now the fully charged estimated range is 36 miles. Obviously the range estimate is based on past driving experience and the settings of the car (e.g. eco-pro, A/C or no A/C, etc.). But I wonder how far back in time or distance does the algorithm look for recent mileage data to use in the updated estimate. Any ideas?

drlonline · 07-30-2018, 06:44 PM

Someone mentioned the estimated e-range is calculated using a rolling average based on the previous 20 miles or so and the current driving conditions (e.g. comfort vs. eco-pro). That sounds about right based on a drive I did yesterday. I took another scenic drive up into my local mountains, driving up in Sport mode and returning back down in e-Drive. The distance was about 25 miles each way, so the average electrical energy consumption on the way down was very low since it was mostly downhill. I plugged it in when I got home and found the estimated e-range this morning was all the way up to 44 miles (71 km). Doing my normal drive today, which was mostly 70+ mph freeway driving in comfort mode with A/C, I only achieved 28 miles actual e-range. Still not bad, considering the pre-LCI cars were typically in the high teens, but obviously not as high as yesterday's highly efficient driving might suggest.

zorgzx · 08-02-2018, 03:17 AM

The last 20 miles or 30 km sound about right, thats the same my F10 does. However theres a recalculation in there somewhere that is triggered I think. If you change your pattern wildly.
Recently I was driving home and tried to make a Ferry crossing. As this was in derestricted germany it was ofcourse done useing Sport and lots of boost

.
Upon nearing the ferry crossing (motorway ends the last 15km is on normal road) I was running badly out of fuel (curse that tiny tank). So I activated eco-pro and cruised doing no overtakes and kept speed very low. the distance to target was 59 km and the total range (10% battery or so) was 45 km. After perhaps 7-8km of this calm driving the distance to target was 51 and the range 52. Upon reaching the target I still had total range of 20Km.

07-27-2018, 10:05 PM	#1
drlonline Lieutenant 139 Rep 514 Posts Drives: 2019 i8 Coupe Join Date: Sep 2013 Location: L.A., CA iTrader: (0)	Electric Range Estimation Algorithm Does anyone know exactly how the i8 calculates the electric only range estimate? With my 2019 coupe, it typically shows ~ 30 miles when fully charged. I've previously had it show as much as 38 miles when the car was just a few weeks old. Today, I took the car into the mountains, using Sport mode going up and e-Drive coming down. Now the fully charged estimated range is 36 miles. Obviously the range estimate is based on past driving experience and the settings of the car (e.g. eco-pro, A/C or no A/C, etc.). But I wonder how far back in time or distance does the algorithm look for recent mileage data to use in the updated estimate. Any ideas?
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07-30-2018, 06:44 PM	#2
drlonline Lieutenant 139 Rep 514 Posts Drives: 2019 i8 Coupe Join Date: Sep 2013 Location: L.A., CA iTrader: (0)	Someone mentioned the estimated e-range is calculated using a rolling average based on the previous 20 miles or so and the current driving conditions (e.g. comfort vs. eco-pro). That sounds about right based on a drive I did yesterday. I took another scenic drive up into my local mountains, driving up in Sport mode and returning back down in e-Drive. The distance was about 25 miles each way, so the average electrical energy consumption on the way down was very low since it was mostly downhill. I plugged it in when I got home and found the estimated e-range this morning was all the way up to 44 miles (71 km). Doing my normal drive today, which was mostly 70+ mph freeway driving in comfort mode with A/C, I only achieved 28 miles actual e-range. Still not bad, considering the pre-LCI cars were typically in the high teens, but obviously not as high as yesterday's highly efficient driving might suggest. Attached Images
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08-02-2018, 03:17 AM	#3
zorgzx Private First Class 23 Rep 100 Posts Drives: I8 Coupe Join Date: Aug 2018 Location: Denmark iTrader: (0)	The last 20 miles or 30 km sound about right, thats the same my F10 does. However theres a recalculation in there somewhere that is triggered I think. If you change your pattern wildly. Recently I was driving home and tried to make a Ferry crossing. As this was in derestricted germany it was ofcourse done useing Sport and lots of boost . Upon nearing the ferry crossing (motorway ends the last 15km is on normal road) I was running badly out of fuel (curse that tiny tank). So I activated eco-pro and cruised doing no overtakes and kept speed very low. the distance to target was 59 km and the total range (10% battery or so) was 45 km. After perhaps 7-8km of this calm driving the distance to target was 51 and the range 52. Upon reaching the target I still had total range of 20Km.
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