1. DTP Lab Process ICE: Open Issues
Preliminary remark: If the WLTP project wants to fulfill the timeline of the roadmap fundamental change of the lab equipment should be avoided
What is a “fundamental change”? E.g. If a new fan is required as a consequence of new specifications, is this a fundamental change?
"Vehicle Dyno Mode“
Rationale: to ensure a safe operation and easy handling and preparation of the test vehicle (e.g. to switch off ABS/PSM when measuring a 4WD vehicle on a 2WD chassis dyno).
Improvements of the gtr text needed to ensure transparency (no cycle beating, use only if needed)
Proposal?

2. DTP Lab Process ICE: Open Issues
Test Room and Soak area temperature
Currently between 20 and 30° C
Industry recommendation 25 ± 5 °C
Soak room: technical feasibility (simpler at lower temperatures…)
Preconditioning minimum soak time
Currently 6 hours
Engine incapsulation for thermal management could be an issue (longer cool down time)
Forced cooling allowed?

3. DTP Lab Process ICE: Open Issues
Cooling Fan
New specifications
Reporting requirements?
Gear Shift Indicator
Appropriate methodology to be defined
Number of tests
Currently: 1 test if emissions below 70% of the limits (including DF)
3 tests if emissions above 70% of the limits
US and Japan perform 1 test

4. DTP Lab Process ICE: Open Issues
Inertia Classes
Currently well defined inertia classes
E.g: kg Inertia used for the roller bench: 1360 kg
New inertia classes being defined
In the past inertia classes were justified because inertia was simulated mechanically
Modern roller bench can simulate any value of inertia (within the inertia simulation range)

5. DTP Road Load Determination: Open Issues
Currently ISO used
Many ‘flexibilities’ in current road load test procedure
TŰV Nord showed reductions of CO2 emissions up to 10% on NEDC test cycle for reduced road load (-20% at 20 km/h, -10% at 40 – 120 km/h)
Swedish Transport Administration proposes two approaches:
Feed-forward approach: Introduce tighter tolerances in order to match as much as possible resistance to progress of production vehicles
Feed-back approach: Production vehicles will be tested as well and results will be compared with type approval test
In this case road load determination would have to be part of the CoP procedure or even in the in-use compliance checking

6. DTP measurement/equipment: Open Issues
Raw exhaust measurement
Not included so far
Issue linked to unregulated emissions (in some cases unregulated emissions can be measured only at the exhaust due to the too low concentration in the diluted exhaust e.g. use of FTIR)
Partial flow measurement
Time restriction seems to not allow the review of the techniques available (e.g. Bag Mini Diluter)
Excluded?
Hydrocarbons
Definition of VOC needed
NMOG: non-methane organic gas?