1. Specifications for 4WD Chassis Dynamometer in WLTP
WLTP-DTP-LabProcICE-203
Specifications for 4WD Chassis Dynamometer in WLTP
Result of Expert-Meeting for LabProcICE 24./
K. Kolesa Audi AG

2. Specifications for 4WD-Dynamometer in WLTP
2.3. Additional specific requirements for 4WD chassis dynamometers The 4WD control system shall be designed such that the following requirements are met when tested with a vehicle driven over the WLTP driving cycle : Road load simulation shall be applied such that operation in 4WD mode reproduces the same proportioning of forces as would be encountered when driving the vehicle on a smooth, dry, level road surface All roll speeds shall be synchronous to within ± 0.16 km/h. This may be assessed by applying a 1 s moving average filter to rolls speed data acquired at 20 Hz. This has to be checked for new dynamometer instalment and after major repair or maintenance The difference in distance between front and rear rolls shall be less than 0.1 m in any 200 ms time period. If it can be demonstrated that this criteria is met, then the speed synchronicity requirement above is not required. Review clause: To be reviewed after finalization of future 1066 regulation The difference in distance covered by the front and rear rolls shall be less than 0.2 per cent of the driven distance over the WLTC.
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