Download WLTP-06-26e - Starting note default…

WLTP-06-26e
Starting note on Default RLD parameters
Informal Group – WLTP
Vienna, 26 – 28.03.2014
Currently in ECE R83
Reference mass of vehicle
RW
(kg)
....
1080 < RW ≤ 1190
1190 < RW ≤ 1305
1305 < RW ≤ 1420
1420 < RW ≤ 1530
1530 < RW ≤ 1640
1640 < RW ≤ 1760
1760 < RW ≤ 1870
1870 < RW ≤ 1980
1980 < RW ≤ 2100
2100 < RW ≤ 2210
2210 < RW ≤ 2380
2380 < RW ≤ 2610
2610 < RW
Equivalent
inertia
Power and load absorbed by the
dynamometer at 80 km/h
Road Load
Coefficients
kg
kW
N
a (N)
b(N/kph2)
...
1130
1250
1360
1470
1590
1700
1810
1930
2040
2150
2270
2270
2270
...
6.3
6.7
7.0
7.3
7.5
7.8
8.1
8.4
8.6
8.8
9.0
9.4
9.8
...
284
302
315
329
338
351
365
378
387
396
405
423
441
...
6.4
6.8
7.1
7.4
7.6
7.9
8.2
8.5
8.7
8.9
9.1
9.5
9.9
...
0.0433
0.0460
0.0481
0.0502
0.0515
0.0536
0.0557
0.0577
0.0591
0.0605
0.0619
0.0646
0.0674
Currently in WLTP
5.2. The default road load force shall be calculated using the following
equation:
Fc = f0 + f1 x v + f2 x v2
where:
Fc is the calculated default road load force for a given vehicle velocity , and it
is expressed in Newton (N);
F0 is the constant road load coefficient, in N, defined by the equation:
F0 = 0.140 x TM
f1 is the first order road load coefficient and shall be equal to zero;
F2 is the second order road load coefficient, in N·(h/km)², defined by the
equation:
F2 = 2.8 x 10-6 x TM + 0.017 x width x height
2000
Currently in ECE R83
1800
1600
M 2040
M 2150
M 2270
M 2270
M 2270
N 2040
N 2150
N 2270
N 2270
N 2270
1400
Load (N)
1200
1000
800
600
400
200
0
0
20
40
60
80
Speed (km/h)
100
120
140
Comparison between NEDC dyno load and WLTP
road load
2500
NEDC M 2270
NEDC N 2270
WLTP 2270 VW Crafter
2000
Load (N)
1500
1000
500
0
0
20
40
60
80
Speed (km/h)
100
120
140
No comparison between NEDC dyno load and
WLTP road load possible
2500
NEDC M 2270
NEDC N 2270
WLTP 2270 VW Crafter
2000
1500
1000
500
0
0
20
40
60
80
100
120
WLTP
NEDC
140
Next Steps
• The formula in the WLTP gtr was adopted in June 2013 on the
understanding that the fixed factors 0.14 , 2.8 x 10-6 and 0.017
need to be validated
• During the ongoing EU WLTP Correlation Programme, a
Volkswagen Crafter will be tested on NEDC and WLTP in both
M1 and N1 configurations
• This will give a comparison between the road loads
experienced from the two test procedures
• The remaining question is which coastdown data is required by
Contracting Parties in order to compare WLTP with real life