# Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance), Division 3.2: Steering System

Extent: E+W+S+N.I.

For the steering pump power the standard values [W] shown in Table 2 shall be used depending on the application in combination with correction factors:
Table 2
Mechanical power demand of steering pump
Identification of vehicle configuration
Steering power consumption P [W]
Number of axles
Axle configuration
Chassis configuration
Technically permissible maximum laden mass (tons)
Vehicle group
Long haul
Regional delivery
Urban delivery
Municipal utility
Construction
U+F
B
S
U + F
B
S
U + F
B
S
U + F
B
S
U + F
B
S
2
4 × 2
Rigid lorry + (Tractor)
> 7,5 - 10
1
240
20
20
220
20
30
Rigid lorry + (Tractor)
> 10 - 12
2
340
30
0
290
30
20
260
20
30
Rigid lorry + (Tractor)
> 12 - 16
3
310
30
30
280
30
40
Rigid lorry
> 16
4
510
100
0
490
40
40
430
40
50
430
30
50
580
30
70
Tractor
> 16
5
600
120
0
540
90
40
640
50
80
4 × 4
Rigid lorry
> 7,5 - 16
6
—
Rigid lorry
> 16
7
—
Tractor
> 16
8
—
3
6 × 2/2 – 4
Rigid lorry
all
9
600
120
0
490
60
40
440
50
50
430
30
50
640
50
80
Tractor
all
10
450
120
0
440
90
40
640
50
80
6 × 4
Rigid lorry
all
11
600
120
0
490
60
40
430
30
50
640
50
80
Tractor
all
12
450
120
0
440
90
40
640
50
80
6 × 6
Rigid lorry
all
13
—
Tractor
all
14
4
8 × 2
Rigid lorry
all
15
—
8 × 4
Rigid lorry
all
16
640
50
80
8 × 6/8 × 8
Rigid lorry
all
17
—
where:
U Unloaded – pumping oil without steering pressure demand
F Friction – friction in the pump
B Banking – steer correction due to banking of the road or side wind
S Steering – steer pump power demand due to cornering and manoeuvring.
To consider the effect of different technologies, technology depending scaling factors as shown in Table 3 and Table 4 shall be applied.
Table 3
Scaling factors depending on technology
Factor c1 depending on technology
Technology
c1,U + F
c1,B
c1,S
Fixed displacement
1
1
1
Fixed displacement with electronical control
0,95
1
1
Dual displacement
0,85
0,85
0,85
Variable displacement, mech. controlled
0,75
0,75
0,75
Variable displacement, elec. controlled
0,6
0,6
0,6
Electric
0
1,5/ηalt
1/ηalt
with ηalt = alternator efficiency = const. = 0,7
If a new technology is not listed, the technology ‘ fixed displacement ’ shall be considered in the simulation tool.
Table 4
Scaling factor depending on number of steered axles
Factor c2 depending on number of steered axles
Number of steered axles
Long haul
Regional delivery
Urban delivery
Municipal utility
Construction
c2,U+F
c2,B
c2,S
c2,U+F
c2,B
c2,S
c2,U+F
c2,B
c2,S
c2,U+F
c2,B
c2,S
c2,U+F
c2,B
c2,S
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
0,7
0,7
1,0
0,7
0,7
1,0
0,7
0,7
1,0
0,7
0,7
1,0
0,7
0,7
3
1
0,5
0,5
1,0
0,5
0,5
1,0
0,5
0,5
1,0
0,5
0,5
1,0
0,5
0,5
4
1,0
0,5
0,5
1,0
0,5
0,5
1,0
0,5
0,5
1,0
0,5
0,5
1,0
0,5
0,5
The final power demand is calculated by:
If different technologies are used for multi-steered axles, the mean values of the corresponding factors c1 shall be used.
The final power demand is calculated by:
Ptot = Σi(PU + F * mean(c1,U +F ) * (c2i,U + F)) + Σi(PB * mean(c1,B) * (c2i,B)) + Σi(PS * mean(c1,S) * (c2i,S))
where:
Ptot Total power demand [W]
P Power demand [W]
c1 Correction factor depending on technology
c2 Correction factor depending on number of steered axles
U+F Unloaded + friction [-]
B Banking [-]
S Steering [-]
i Number of steered axles [-]

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Source: https://www.legislation.gov.uk/eur/2017/2400/annex/IX/division/3/division/3.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-2400/annex-IX/division-3/division-3.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.