1. Supplemental test - overview
WLTP-DTP-LabProcICE-233
Supplemental test - overview
Proposal for a test at representative regional conditions
C. Mayer, A. Eder, BMW;
M. Bergmann, Audi

2. overview
To reflect the CO2 values obtained in real life, EU-COM wants to introduce an additional test under „realistic conditions“ .
During DTP-13 (Tokyo) all Contracting Parties agreed to introduce this approach with regional conditions into the gtr.
The following conditions are deemed to be crucial:
Representative temperature (current discussion in EU [14]°C)
Representative parking/soaking time (current discussion in EU [7] +2h)
Representative parking conditions (natural soak)
The conditions currently discussed for Europe are based on the analysis for eco innovations by JRC.
The type I test at 23 °C shall be performed for every vehicle during type approval
Type I test without active heat storage technologies
The supplemental test shall be performed only once for a vehicle family

3. CO2 calculation – correction of the values obtained at 23 °C
Vehicle family
Test cell, soak: 23 °C
Soak time: 6 – 36 h
Engine oil, water: 23 °C
CO2_3
CO2_1
CO2_2
Supplemental
test
Test cell, soak: [14] °C
Soak time: [7 + 2] h
Engine oil, water: no restrictions
FCF = family correction factor
CO2_ind = individual CO2 value
Creg = regional conditions

4. Family definition part 1
A family is defined by (based on the in-service families)
• combustion process (two stroke, four stroke, rotary);
• number of cylinders;
• configuration of the cylinder block (in-line, V, radial, horizontally opposed, other) The inclination or orientation of the cylinders is not a criteria);
• method of engine fuelling (e.g. indirect or direct injection);
• type of cooling system (air, water, oil);
• method of aspiration (naturally aspirated, pressure charged);
• fuel for which the engine is designed (petrol, diesel, NG, LPG, etc.). Bi fuelled vehicles may be grouped with dedicated fuel vehicles providing one of the fuels is common;
• engine cylinder capacity of the largest engine within the family minus 30 %.

5. Family definition part 2
Furthermore the manufacturer has to show that the representative TMH vehicles of the combined approach families (CAF) within the temperature correction family (TCF) have a similar temperature of engine oil and water if any, after driving the respective type I test can be shown for each representative vehicle in the lab) and soaking for the representative regional soak From the measured temperatures the average soak area temperature of the last third of the soak process has to be subtracted and the resulting temperatures should be within a range of [10]K (mean Value ±[5]K) within the TCF. If active heat storage systems are installed, the heat capacity within the family has to be comparable as follows: the heat capacity is defined by the enthalpy stored in the system and has to be within a range of [6] % (mean value ± 3%) for a vehicle family.

6. Family definition part 2 –supplemental information
Vehicle 1 in family T
Vehicle 2 in family
T_CD_1
T_soak_1
T_CD_2
T_soak_2 …
1/3 Δt
1/3 Δt
ΔT_2
ΔT_1
26°C
23°C
20°C
26°C
23°C
20°C
t_soak
t_soak
 All the ΔT_i values within a family have to be in a tolerance of [10]K

7. Guideline to establish regional temperatures and soak times
Regional soak temperature: Each region shall define a representative soak and test temperature. The regional temperature has to be (shall) derived from statistics taking into account the meteorological data, population and traffic density of the different areas within a region. On top of this a temperature offset accounting for the garage parking has to be added.
Parking/Soaking times
The regional soak time shall be based on the average regional parking times.
Typical use cases for soak time are overnight parking ~10-12h and daytime parking at work ~8h. A suggested set point for the soak value is 9h (can be adjusted to regional requirements). To give flexibility for the test facilities a tolerance of +0…2h is given.

8. Validation
Aims:
Show that boundary vehicles of the family have a similar Δ_CO2
First T_reg and t_soak have to be defined
BMW offer:
Comparisson of 328 xiA Limo (CAF1) and 320i Touring (CAF2)
23°C Type 1 Test
Comparison of temperatures after t_soak
14°C => Calculation and comparison of correlation FCFs
Who would help? => TÜV?
What CO2 tolerance would be acceptable?

9. Active heat storage technologies
Active heat storage technology means a technology that can be activated by an actuator (e.g. a valve) to release heat at a moment