Tests of urban bus specific emissions in terms of currently applicable heavy vehicles operating emission regulations

Jerzy Merkisz,Łukasz Rymaniak

doi:10.19206/ce-2017-103

Abstract

The article presents a study of a city bus in real operating conditions (RDE) from the perspective of the latest regulations for the assessment of specific emissions compliance for heavy-duty vehicles (Euro VI standard). The object of the research was a serial configuration hybrid drive vehicle. Measurements were made in the real driving conditions in Poznan agglomeration. The latest mobile equipment PEMS was used for the measurements. This article presents the details of the EU 582/2011 Procedure in operational conformity assessment, the methodology of the study was discussed, and the obtained results were presented, both in terms of vehicle operating conditions and engine operation, as well as specific emissions evaluation.

Highlights

Buses have a significant impact on the environmental quality in urban areas, where there are large concentrations of people
The share of urban buses, non-urban buses, and tourist coaches from all the HDVs (Heavy-Duty Vehicle) in the European Union is 11%, while the estimated fuel consumption by these vehicles accounts for 15% of the consumption of all HDVs [12, 13]
6.07 route, and these parameters have a direct impact on the operating conditions of the drive systems used

Summary

Introduction

Buses have a significant impact on the environmental quality in urban areas, where there are large concentrations of people. Among the most important information it should be noted that the measurements need to be carried out on public roads in the EU, using normal driving patterns and loads This means that the tests are conducted using the standard (the most common) operating conditions. Pollutants specific emission evaluation is done using the moving averaging window method Their determination is based on defining the mass flow rate of harmful substances emission for a subset of the complete data set, whose length is determined so as to correspond to the weight of CO2 from the engine or the work measured on a test bench in transient operating conditions (WHTC test). Where: CF – conformity factor in the given averaging window [–], Lj – the permissible pollutant emission j in the WHTC test [mg/(kW·h)]

Research methodology in real operating conditions

Findings

Assessment of specific emissions