EN
L 290/310
Official Journal of the European Union
Ä
¼ Ad þ B d v j þ
¼
Õ
Cd v2j
Ö
Ä
Ä
as þ bs vj þ cs v2j r0
Ö
þ
10.11.2022
Ä
at þ bt vj þ ct v2j r0
Ö
Ø Õ Ø Õ Ø ðat Ä as Þ ðbt Ä bs Þ ðct Ä cs Þ 2 Ad þ þ Bd þ vj þ Cd þ vj r0 r0 r0
therefore: Aäd ¼ Ad þ
at Ä as r0
Bäd ¼ Bd þ
bt Ä bs r0
Cäd ¼ Cd þ
ct Ä cs r0
where: F*dj
is the new chassis dynamometer setting load, N;
Fej
is the adjustment road load equal to (Fsj-Ftj), Nm;
Fsj
is the simulated road load at reference speed vj, Nm;
Ftj
is the target road load at reference speed vj, Nm;
A*d, B*d and C*d are the new chassis dynamometer setting coefficients; r’
is the dynamic radius of the tyre on the chassis dynamometer obtained at 80 km/h, m.
Paragraphs 8.2.2. and 8.2.3. of this annex shall be repeated until the tolerance in paragraph 8.2.3.2. of this annex is met.
8.2.3.4.
The mass of the driven axle(s), tyre specifications and chassis dynamometer load setting shall be recorded when the requirement of paragraph 8.2.3.2. of this annex is fulfilled.
8.2.4.
Transforming running resistance coefficients to road load coefficients f0, f1, f2
8.2.4.1.
If the vehicle does not coast down in a repeatable manner and a vehicle coastdown mode according to paragraph 4.2.1.8.5. of this annex is not feasible, the coefficients f0, f1 and f2 in the road load equation shall be calculated using the equations in paragraph 8.2.4.1.1. of this annex.
In any other case, the procedure described in paragraphs 8.2.4.2. to 8.2.4.4. inclusive of this annex shall be performed.
8.2.4.1.1.
f0 ¼
c0 r
f1 ¼
C1 Ü 1:02 r
f2 ¼
C2 Ü 1:02 r
Ü 1:02