Division 3.9 Input data for air drag pre-processing toolF1

United Kingdom

The following tables show the requirements for the measurement data recording and the preparatory data processing for the input into the air drag pre-processing tool:

Table 2 for the vehicle data file
Table 3 for the ambient conditions file
Table 4 for the measurement section configuration file
Table 5 for the measurement data file
Table 6 for the altitude profile files (optional input data)

A detailed description of the requested data formats, the input files and the evaluation principles can be found in the technical documentation of the air drag pre-processing tool. The data processing shall be applied as specified in section 3.8 of this Annex.

Table 2

Input data for the air drag pre-processing tool – vehicle data file

Input data	Unit	Remarks
Specification of transmission ratios with at least 3 digits after decimal separator
If the wheel speed signal is provided to the air drag pre-processing tool (option for vehicles with torque converters, see section 3.4.3 the axle ratio shall be set to ‘1.000’.
Input only required if value is lower than 88 km/h.
Vehicle group code	[-]	1 - 17 for trucks
Vehicle configuration with trailer	[-]	if the vehicle was measured without trailer (input ‘No’) or with trailer i.e. as a truck/trailer or tractor semitrailer combination (input ‘Yes’)
Vehicle test mass	[kg]	actual mass during measurements
Gross vehicle mass	[kg]	gross vehicle mass of the rigid lorry or tractor (w/o trailer or semitrailer)
Axle ratio	[-]	axle transmission ratio^f1 ^f2
Gear ratio high speed	[-]	transmission ratio of gear engaged during high speed test
Gear ratio low speed	[-]	transmission ratio of gear engaged during low speed test
Anemometer height	[m]	height above ground of the measurement point of installed anemometer
Vehicle height	[m]	maximum vehicle height according to 3.5.3.1 item vii.
Gear box type	[-]	manual or automated transmission: ‘ SMT ’ , ‘ AMT ’ , ‘ DCT ’ , automatic transmission with torque converter: ‘ APT ’
Vehicle maximum speed	[km/h]	maximum speed the vehicle can be practically operated at the test track^f3

Table 3

Input data for the air drag pre-processing tool – ambient conditions file

Signal	Column identifier in input file	Unit	Measurement rate	Remarks
Time	<t>	[s] since day start (first day)	—	—
Ambient temperature	<t_amb_stat>	[°C]	At least 1 averaged value per 6 minutes	Stationary weather station
Ambient pressure	<p_amb_stat>	[mbar]		Stationary weather station
Relative air humidity	<rh_stat>	[%]		Stationary weather station

Table 4

Input data for air drag pre-processing tool – measurement section configuration file

Input data	Unit	Remarks
Trigger signal used	[-]	1 = trigger signal used; 0 = no trigger signal used
Measurement section ID	[-]	user defined ID number
Driving direction ID	[-]	user defined ID number
Heading	[°]	heading of the measurement section
Length of the measurement section	[m]	—
Latitude start point of section	decimal degrees or decimal minutes	standard GPS, unit decimal degrees: minimum 5 digits after decimal separator
Longitude start point of section		standard GPS, unit decimal minutes: minimum 3 digits after decimal separator
Latitude end point of section		DGPS, unit decimal degrees: minimum 7 digits after decimal separator
Longitude end point of section		DGPS, unit decimal minutes: minimum 5 digits after decimal separator
Path and/or filename of altitude file	[-]	only required for the constant speed tests (not the misalignment test) and if the altitude correction is enabled.

Table 5

Input data for the air drag pre-processing tool – measurement data file

Signal	Column identifier in input file	Unit	Measurement rate	Remarks
Time	<t>	[s] since day start (of first day)	100 Hz	rate fixed to 100 Hz; time signal used for correlation with weather data and for check of frequency
(D)GPS latitude	<lat>	decimal degrees or decimal minutes	GPS: ≥ 4 Hz DGPS: ≥ 100 Hz	standard GPS, unit decimal degrees: minimum 5 digits after decimal separator
(D)GPS longitude	<long>	decimal degrees or decimal minutes	GPS: ≥ 4 Hz DGPS: ≥ 100 Hz	standard GPS, unit decimal minutes: minimum 3 digits after decimal separator DGPS, unit decimal degrees: minimum 7 digits after decimal separator DGPS, unit decimal minutes: minimum 5 digits after decimal separator
(D)GPS heading	<hdg>	[°]	≥ 4Hz
DGPS velocity	<v_veh_GPS>	[km/h]	≥ 20 Hz
Vehicle velocity	<v_veh_CAN>	[km/h]	≥ 20 Hz	raw CAN bus front axle signal
Air speed	<v_air>	[m/s]	≥ 4 Hz	raw data (instrument reading)
Inflow angle (beta)	<beta>	[°]	≥ 4 Hz	raw data (instrument reading); ‘180°’ refers to air flow from front
Engine speed or cardan speed	<n_eng> or <n_card>	[rpm]	≥ 20 Hz	cardan speed for vehicles with torque converter not locked during low speed test
Torque meter (left wheel)	<tq_l>	[Nm]	≥ 20 Hz	—
Torque meter (right wheel)	<tq_r>	[Nm]	≥ 20 Hz	—
Ambient temperature on vehicle	<t_amb_veh>	[°C]	≥ 1 Hz
Trigger signal	<trigger>	[-]	100 Hz	optional signal; required if measurement sections are identified by opto electronic barriers (option ‘trigger_used=1’)
Proving ground temperature	<t_ground>	[°C]	≥ 1 Hz
Validity	<valid>	[-]	—	optional signal (1=valid; 0=invalid);

Table 6

Input data for the air drag pre-processing tool – altitude profile file

Input data	Unit	Remarks
Latitude	decimal degrees or decimal minutes	unit decimal degrees: minimum 7 digits after decimal separator
Longitude	unit decimal minutes: minimum 5 digits after decimal separator
Altitude	[m]	minimum 2 digits after decimal separator

Input data

Unit

Remarks

Latitude

decimal degrees or decimal minutes

unit decimal degrees:

minimum 7 digits after decimal separator

Longitude

unit decimal minutes:

minimum 5 digits after decimal separator

Altitude

[m]

minimum 2 digits after decimal separator

Annotations

Textual amendments

F1: Substituted by Commission Regulation (EU) 2019/318 of 19 February 2019 amending Regulation (EU) 2017/2400 and Directive 2007/46/EC of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles (Text with EEA relevance).

Footnotes

f1: Specification of transmission ratios with at least 3 digits after decimal separator
f2: If the wheel speed signal is provided to the air drag pre-processing tool (option for vehicles with torque converters, see section 3.4.3 the axle ratio shall be set to ‘1.000’.
f3: Input only required if value is lower than 88 km/h.