Design & Validation of High-Altitude Test Rig for ATS & component level testing

New regulation standards on engine pollutant emissions are widening the engine operating conditions subjected to type approval tests to prevent from the gap between regulated and real-driving emissions. In this regard, ambient temperature and driving altitude are new boundaries to be considered. Although the basis of the impact of these variables has been studied concerning the engine performance, new challenges appear to meet the emission limits and the aftertreatment conversion efficiency. When operating at high altitude (up to 6000 ft) in a wide range of ambient temperature (range -5° C to 50°C), Particular focus is put on the modelling of the DEF Dosing. Starting from a sea-level calibration, the proposed methodology accounts for mechanical criteria as well as the impact on the engine raw emissions and exhaust flow properties to define new calibration setting for altitude operation. The paper focuses on developing an altitude rig to simulate the test conditions and helps enable component level validation for optimizing the designs before the system level verification.