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Old 04-15-2013, 07:47 AM   #1 (permalink)
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Electric Vehicles mileage database?

I found some physic/math formulas which allow me to calculate how much power and energy a vehicle needs to move at different speeds.
As all of you know this depends on vehicle Cd and Frontal Area, so I actually have a quite large range of values.
I'm looking for real data of different EVs at different speeds to compare to my simulation results: does it exist such kind of database around? And, most difficult, does it exist for motorbikes? (I wonder why motorbikes are so rare in vehicle mechanics literature!)

I currently have this data for an electric minicar (400 kg) with Cd=0.3 and FA=2.2 m^2:
Code:
 km/h	mph	Wh/km	Wh/mi	W
10	6	23	 37 	230
20	12	25	 40 	509
30	19	30	 48 	887
36	22	33	 53 	1182
40	25	35	 56 	1414
50	31	43	 69 	2139
54	34	46	 74 	2495
60	37	52	 83 	3111
70	44	63	 101 	4381
80	50	75	 120 	5997
90	56	89	 143 	8010
100	62	105	 168 	10468
108	67	118	 189 	12789
110	69	122	 196 	13422
120	75	141	 226 	16920
130	81	162	 260 	21013
140	87	184	 295 	25749
150	94	208	 333 	31179
This is for motorbike (Cd=0.7, FA=0.7)
Code:
km/h	mph	Wh/km	Wh/mi	W
10	6	23	37	228
20	12	25	40	492
30	19	28	45	830
36	22	30	48	1083
40	25	32	51	1278
50	31	37	59	1873
54	34	40	64	2161
60	37	44	71	2652
70	44	52	83	3652
80	50	61	98	4909
90	56	72	115	6460
100	62	83	133	8342
108	67	94	151	10111
110	69	96	154	10592
120	75	110	176	13246
130	81	126	202	16342
140	87	142	228	19915
150	94	160	256	24004
W formula:
E1=(C$3+0,5*L$2*L$3*L$4*I1*I1)*I1
  • C3=Rolling Friction (= roll friction coefficient 0,015 * weight x 9,81)
  • L2=Cd
  • L3=FA
  • L4=air density = 1,167
  • I1= speed in m/s

Wh/km formula:
D1=E1/J1
  • J1 = speed in km/h

If there are no mileage data around, it will be enough to have Cd and FA for vehicles (bot cars and bikes), I'll calculate mileage by above formulas.

edit:
Values for flat road, constant speed.
update: added wh/km

edit2:
deleted "thousands dots"
added mph column


Last edited by jumpjack; 04-16-2013 at 03:53 AM..
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Old 04-15-2013, 09:07 AM   #2 (permalink)
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Not sure why, but both of those charts seem to give figures that are low.
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Old 04-15-2013, 02:44 PM   #3 (permalink)
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Quote:
Originally Posted by Ryland View Post
Not sure why, but both of those charts seem to give figures that are low.
I think it's because they are calculated for a constant speed on a flat road with 0% slope: impossible in real life!
But you can consider these values as "mimimum energy consumption": you can't go lower, only higher.

As per my experience, average cosumptions are (more or less):
1000-2000 W Ebike: 30-50 Wh/km
3000-5000 W Ebike: 60-70 Wh/km
4-6 kW minicar (45 km/h): 80 Wh/km
6-8 kW minicar (80 km/h): 100 Wh/km
small car: 150 Wh/km
big car: 200 Wh/km

But having real and more detailed data would be really interesting!
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Old 04-15-2013, 05:39 PM   #4 (permalink)
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Hi jumpjack,
So its in mostly conventional units but look: The ecomodder calculator.
Your chart doesn't seem to have any weight of vehicle. If I run with your Cd and area, I see this.
550 KG (1200 lb) is a very light car.
-mort
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Old 04-15-2013, 08:13 PM   #5 (permalink)
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Quote:
Originally Posted by Ryland View Post
Not sure why, but both of those charts seem to give figures that are low.
I think because it's in metric kilometers, which gives smaller values making everything seem more efficient.
Quote:
Originally Posted by mort View Post
Hi jumpjack,
So its in mostly conventional units but look: The ecomodder calculator.
Your chart doesn't seem to have any weight of vehicle. If I run with your Cd and area, I see this.
550 KG (1200 lb) is a very light car.
-mort
Speaking about very light cars, check out the ridiculously efficient wh/m rating vs speed graph for the Edison2. 200 miles range at 60mph with 16kwh.
Edison2 - Very Light Blog - And The Consequences Are

Use the Calculator at the top of the forum. Use the KWH needed at speed / the speed to get the wh/km or mi rating.
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Old 04-16-2013, 03:40 AM   #6 (permalink)
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Quote:
Originally Posted by mort View Post
Hi jumpjack,
So its in mostly conventional units but look: The ecomodder calculator.
Your chart doesn't seem to have any weight of vehicle. If I run with your Cd and area, I see this.
550 KG (1200 lb) is a very light car.
-mort
I updated the tables adding Wh/mi.
The weight of the vehicle is included by means of rolling friction (--> rolling power), but it slightly affects result, as it depends on "v", while air friction depends on "v^3".

This table shows how much rolling friction affects total power:
Code:
 Pair+Proll 	 Proll 	Proll/Ptot
 228 	 221 	97%
 492 	 443 	90%
 830 	 664 	80%
 1083 	 797 	74%
 1278 	 886 	69%
 1873 	 1107 	59%
 2161 	 1196 	55%
 2652 	 1328 	50%
 3652 	 1550 	42%
 4909 	 1771 	36%
 6460 	 1993 	31%
 8342 	 2214 	27%
 10111 	 2391 	24%
 10592 	 2435 	23%
 13246 	 2657 	20%
 16342 	 2878 	18%
 19915 	 3100 	16%
 24004 	 3321 	14%
Rolling friction force:
Froll = mu * m * 9,81
mu = 0,015 (rolling friction coefficient)
m = vehicle weight in kg

Simplified formula:
Froll = 0,15 * m
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Old 04-16-2013, 03:52 AM   #7 (permalink)
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Quote:
Originally Posted by mort View Post
I see [URL="http://ecomodder.com/forum/tool-aero-rolling-resistance.php?Weight=550&WeightUnits=kg&CRR=.015& Cd=.3&FrontalArea=2.2&FrontalAreaUnits=m^2&FuelWh= 33557&IceEfficiency=.22&DrivetrainEfficiency=.95&P arasiticOverhead=0&rho=1.225&FromToStep=5-200-5"]this.
Cool, I didn't see the link. I eventually have something to compare my results to!

But you're right, I published results for a "very slight car" as I was studying power/energy for minicars!

Using a "real" car (1000 kg) I get of course higher results, but they also differ depending on battery weight, which depends on how much range you need, and so on....

But switching back to the original question: apart from simulated results, do they exist any experimental results to play with?
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Old 04-16-2013, 04:03 AM   #8 (permalink)
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I just found this amazing site!
Automobile-Catalog the complete Catalog of Cars, car specs database

Does it exist anything similar for motorbikes?
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Old 04-16-2013, 08:01 AM   #9 (permalink)
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This won't give you speed/whkm, but it gives you an idea of what all the EV's can do on a light drive cycle.
Testing Electric Vehicles in the Real World
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Old 04-16-2013, 08:04 AM   #10 (permalink)
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I just found this amazing site!
Automobile-Catalog the complete Catalog of Cars, car specs database

Does it exist anything similar for motorbikes?

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