1. GTR 15 Modifications for road load matrix family and default road load renault proposals

2. 01
General requirements
Road load matrix family vehicle definition 02
Annex 4
Wind tunnel for road load matrix family 03
Annex 6
CO2 interpolation range for default road load

3. General requirements
Road load matrix family vehicle definition 01

4. Road load matrix family
01 General requirements
Road load matrix family
Modification proposal to paragraph 5.8.
5.8 The road load matrix family may be applied for vehicles with a technically permissible maximum laden mass < kg but designed for a technically permissible maximum laden mass ≥ kg.
Comment
The modification clarify the “designed” word, illustrating that vehicle < kg can be included in a RL matrix family if they are part of an interpolation family of vehicles ≥ kg.
This modification can reduce the test burden for e.g LCV with same power train and different maximum mass
Since the RL matrix family degrade the CO2 results, there is not interest to exclude lighter vehicles

5. Annex 4
Wind tunnel for road load matrix family 02

6. Wind tunnel for road load matrix family
02 annex 4
Wind tunnel for road load matrix family
Modification proposal of paragraph 5.1. of Annex 4
5. Method for the calculation of road load or running resistance based on vehicle parameters
5.1. Calculation of road load and running resistance for vehicles based on a representative vehicle of a road load matrix family If the road load of the representative vehicle is determined according to a coastdown method described in paragraph 4.3. of this annex or wind tunnel method described in paragraph 6 of this annex, the road load of an individual vehicle shall be calculated according to paragraph of this annex.
Comment
This modification allow to use the wind tunnel method to test the Representative Vehicle in case of road load matrix family as long as facilities are approved according paragraph 6.2.
This modification can reduce the test burden reducing road test to evaluate the road load.
This change doesn’t have benefic impacts on the CO2 emission of the family

7. Annex 6
CO2 interpolation range for
default road load 03

8. CO2 interpolation range for default road load
03 annex 6
CO2 interpolation range for default road load
Modification proposal of paragraph of Annex 6
The maximum delta CO2 allowed over the applicable cycle resulting from step 9 of Table A7/1 of Annex 7 between test vehicles L and H is 20 per cent plus 5 g/km of the CO2 emissions from vehicle H, but at least 15 g/km and not exceeding 30 g/km. This restriction does not apply for the application of a road load matrix family or where vehicle L and H are based on default road load.
Comment
The maximum delta CO2 is not applicable to an Interpolation family based on a default road load.
This modification can reduce the test burden especially for vehicles with different body shapes, sold in small series.
This change doesn’t have benefic impacts on the CO2 emission of the family

10. Back up slides

11. Road load matrix family
01 General requirements
Road load matrix family
Modification proposal to paragraph 5.8.
Option 2:
5.8 The road load matrix family may be applied for vehicles designed for with a technically permissible maximum laden mass ≥ kg. Vehicles that belong to with a lower permissible laden mass can be part of a road load matrix family if they belong part of the same interpolation family.
Comment
The modification clarify the “designed” word, illustrating that vehicle < kg can be included in a RL matrix family if they are part of an interpolation family of vehicles ≥ kg.
This modification can reduce the test burden for vehicles produced in small series (e.g. LCV)
Since the RL matrix family degrade the CO2 results, there is not interest to exclude lighter vehicles

12. Default road load for road load matrix family
03 annex 4
Default road load for road load matrix family
Modification proposal of paragraph 5.1. of Annex 4
Option 2
5. Method for the calculation of road load or running resistance based on vehicle parameters
5.1. Calculation of road load and running resistance for vehicles based on a representative vehicle of a road load matrix family If the road load of the representative vehicle is determined according to a coastdown method described in paragraph 4.3. of this annex or wind tunnel method described in paragraph 6 of this annex or default road load in paragraph 5.2 of this annex, the road load of an individual vehicle shall be calculated according to paragraph of this annex.
Comment
This modification need the knowledge the Cd of the representative vehicle. This information is normally not known for vehicles that use the default road load.