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J Environ Sci (China). 2018 May;67:273-286. doi: 10.1016/j.jes.2017.09.011. Epub 2017 Oct 3.

Buses retrofitting with diesel particle filters: Real-world fuel economy and roadworthiness test considerations.

Author information

1
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel.
2
Labs for IC-Engines & Exhaust Emission Control (AFHB), Berne University of Applied Sciences, Biel, Switzerland.
3
VERT Association, TTM, Niederrohrdorf, Switzerland.
4
Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa, 3200003, Israel. Electronic address: tartak@technion.ac.il.

Abstract

Retrofitting older vehicles with diesel particulate filter (DPF) is a cost-effective measure to quickly and efficiently reduce particulate matter emissions. This study experimentally analyzes real-world performance of buses retrofitted with CRT DPFs. 18 in-use Euro III technology urban and intercity buses were investigated for a period of 12months. The influence of the DPF and of the vehicle natural aging on buses fuel economy are analyzed and discussed. While the effect of natural deterioration is about 1.2%-1.3%, DPF contribution to fuel economy penalty is found to be 0.6% to 1.8%, depending on the bus type. DPF filtration efficiency is analyzed throughout the study and found to be in average 96% in the size range of 23-560nm. Four different load and non-load engine operating modes are investigated on their appropriateness for roadworthiness tests. High idle is found to be the most suitable regime for PN diagnostics considering particle number filtration efficiency.

KEYWORDS:

Diesel bus; Diesel particle filter; Fuel economy; Roadworthiness tests; Ultrafine particles; Vehicle natural aging

PMID:
29778161
DOI:
10.1016/j.jes.2017.09.011
[Indexed for MEDLINE]

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