Technical Paper
PEMS Light Duty Vehicles Application: Experiences in downtown Milan
2007-09-16
2007-24-0113
Portable Emissions Measurement Systems (PEMS) are becoming an important regulatory tool to monitor the in-use compliance of large sources like heavy-duty vehicles (HDV) or non-road mobile machinery (NRMM). Legislative research programmes in Europe, United States and Japan are introducing PEMS in the regulations. The application of PEMS to light-duty vehicles (LDVs) is not part of or driven by official legislative requirements. However, as the vehicle-engine operation points in the laboratory test cycles are limited, emissions and fuel consumption under real world driving conditions can differ significantly from those measured under controlled laboratory conditions. The present paper discusses the application of PEMS to real-world emission measurements of passenger cars, under the light of the existing instruments and test protocols already developed for heavy-duty vehicles. Data are reported for a measurement campaign carried out in downtown Milan.