1. Supplemental Test for Determination of CO2 Emissions under Regional Conditions
– EU WLTP.
Andreas Eder
for the Working Group on the Development of the Supplemental Test

2. Possibility for Changes of ATCT Parameters and Settings
ATCT – Open Issues
Possibility for Changes of ATCT Parameters and Settings
ATCT is a completely new test and has never been conducted in Type Approval history.
New test facilities might be necessary (natural soak areas)
Current text and settings based on only two test series at PSA and BMW
Need for a validation phase which should start asap (not only at OEM labs!)
Possibility for a revision (maybe not only for ATCT?)

3. ATCT – Open Issues Definitions
As there is a requirement that volume and weight for a ATCT family shall be within a 10% tolerance to the reference vehicle, a definition is necessary what material is counted as „insulation material“ in an engine compartment.
1st Proposal:
Insulation materials means any material in the engine compartment attached to the engine and/or the chassis with a thermal insulation effect and characterized by a maximum heat conductivity of [0,1] W/(mK).
 Confirmation of 10% tolerance regarding volume and weight still pending.

4. ATCT – Open Issues Humidity
Required to adapt humidity to ambiant temperature.
Proposal by Markus Bergmann to widen humidity to 80%:
 3 – 8.1 g H2O/kg dry air (~30 to 80 % rel. Hum.)
Calculation for FC
Currently, the Family Correction Factor (FCF) only applies to CO2
Factor for Fuel Consumption (FC) required as well (but needs to be in line with FC calculation in the GTR)

5. Measurement of soak area temperature
ATCT – Open Issues
Measurement of soak area temperature
In contrast to the Type I test, the position of the temperature sensor in the natural soak are might have an impact on the cool down behaviour.
1st Proposal
Temperature sensor for the soak area should be located in a distiance of max
[xx] m to the measured vehicle and should be representative of the ambiant temperature around the vehicle (…)

6. ATCT – Changes to the Document
Added a 5 min floating average to the temperature of the soak area (in line with the Type 1 now).
10% tolerance of heat release time of an active heat storage device now demonstrated by the OEM, as this can‘t be correctly measured today at Type approval.
A revision clause is envisaged later when these technologies are further rolled out in the market.
Reduced the tolerance of the soak time for the family check from 9-11h to 9h …9h+[15/30 on request of manufacturer] min.
Minor change : to gather family definitions in the same §, so to move the § into the § 3.9 and to change the title of the § („Provision for cool down“)