Analysis of emissions from various driving cycles based on real driving measurements obtained in a high-altitude city

Abstract

Vehicle emissions standards and regulations remain weak in high-altitude regions. In this study, vehicle emissions from both the New European Driving Cycle and the Worldwide harmonized Light-duty driving Test Cycle were analyzed by employing on-road test data collected from typical roads in a high-altitude city. On-road measurements were conducted on five light-duty vehicles using a portable emissions measurement system. The certification cycle parameters were synthesized from real-world driving data using the vehicle specific power methodology. The analysis revealed that under real-world driving conditions, all emissions were generally higher than the estimated values for both the New European Driving Cycle and Worldwide harmonized Light-duty driving Test Cycle. Concerning emissions standards, more CO, NOx, and hydrocarbons were emitted by China 3 vehicles than by China 4 vehicles, whereas the CO2 emissions exhibited interesting trends with vehicle displacement and emissions standards. These results have potential implications for policymakers in regard to vehicle emissions management and control strategies aimed at emissions reduction, fleet inspection, and maintenance programs.

Investigation of real-world emissions of China III and China IV buses in a high-altitude city: A case study of Lhasa

“…Measurement system. The portable emission measurement system used in this study has been described in published papers of our research team 3,22 ; therefore, only a brief summary is supplied here. A Sensors Inc.'s SEMTECH-DS PEMS was used, which included an exhaust flow meter (EFM), gas analyzers, a global position system (GPS), and a remote weather probe.…”

“…Due to industry contributes only about 8% of Lhasa’s gross domestic product, which the main economic activities are animal husbandry, agriculture, and tourism. 3,4 Accordingly, pollutant emissions from vehicles are considered the dominant source of air pollution in Lhasa. Hence, an analysis of emissions from buses in Lhasa will benefit policy-making concerning vehicles in high-altitude cities and can supply a basis for vehicle emissions control and even the management of urban air quality.…”