HDIUT and Portable Emissions Measurement Systems (PEMS)
The ultimate objective of the new HDIUT program is to allow for a significant streamlining of engine certification if a truly robust in-use emissions testing program proves feasible and cost effective. Time-consuming and expensive laboratory assessments of engines could then give way to real-world, real-time emissions assessments that efficiently provides more relevant data.
Basically, the HDIUT is an industry agreed to manufacturer run, in-use, on-road testing program. It builds upon the original NTE standard. It is designed to focus on compliance in the real world, and relies on emissions testing, utilizing Portable Emissions Measurement Systems (PEMS) with NOx, HC, CO and PM being the pollutants to be measured. Measurement Accuracy Margins are being established to account for the emissions measurement variability associated with the PEMS in-use.
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