Comparison of Diesel and Natural Gas Bus Performance

Understanding the effects of traffic congestion on emissions from urban buses. An integrated approach incorporating real-world emissions, naturalistic driving profiles, and city traffic sensor data

“…On the other hand, the values of NOx emission-factors for the tested buses were higher than those reported in previous studies of CNG urban buses (Euro EEV (N.-O. Nylund et al, 2014;Wu et al, 2012), Euro IV (A. Wang et al, 2011), Euro V (Guo et al, 2014;Oprešnik et al, 2018), and Euro VI (Gis, 2017)) and diesel urban buses (Euro V (Guo et al, 2014;Shaojun Zhang, Wu, Hu, et al, 2014) and Euro VI (Gis, 2017)).…”

“…Between the Euro I and Euro VI regulations, the NOx emissions limits for bus diesel engines have been reduced by up to 95 % (N.-O. Nylund et al, 2014). Since the Euro IV regulation, most diesel buses have been equipped with SCR systems to reduce their NOx emissions (Lowell & Kamakaté, 2012).…”

Performance and Emission Characteristic Analysis of a Gasoline Engine Utilizing Different Types of Alternative Fuels: A Comprehensive Review

“…Alternatively, the entire world natural gas (NG) replacement was 6040 Tscf (from Jan 1, 2005), and on the recent consumption rates, the assessed whole recoverable gas, including established assets, is suitable for nearly 66.7 years . The advantages of compressed natural gas (CNG) as an locomotive fuel over conventional fuels are numerous and offered expansively by Nylund et al and Aslam et al , As a result of some of its advantageous physiochemical properties, CNG seems to be an outstanding fuel for the SI engine . In Malaysia, the amount of listed vehicles is 12 million, with 51% of these vehicles using gasoline (from 2002), and there are only 15 600 predictable natural gas vehicles (NGVs) (from July 2005), which are mostly taxis. , That country has around 50 years of gas arrangement, as equivalent to around 10 years oil arrangement .…”

Comparison of Life Cycle Greenhouse Gases from Natural Gas Pathways for Light-Duty Vehicles

“…Life cycle analysis (LCA) is a widely used method to assess the environmental effects of a product or service from production to end of life . There is an extensive body of research about the life cycle greenhouse (GHG) emissions of alternative transportation fuels, including hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), and hydrogen fuel cell electric vehicles (FCEVs). − Similarly, another large body of work has analyzed the life cycle GHG emissions of using natural gas to meet end uses (including transportation). ,,− In 1999, Wang et al evaluated the life cycle GHG emissions of nine natural gas-based fuels, compressed natural gas (CNG), liquefied natural gas (LNG), liquid petroleum gas (LPG), electricity, methanol, gaseous hydrogen, liquid hydrogen, Fischer–Tropsch diesel, and dimethyl ether (DME), and they found that the “use of NG-based fuels can help reduce per-mile fossil energy use considerably and eliminate petroleum use in most cases; all [but near-term M85 FFVs] help reduce GHG emissions.” More recently, Venkatesh et al used a Monte Carlo analysis to characterize the uncertainty of the life cycle GHG emissions of CNG and gasoline HEVs for passenger vehicles. The authors found that both HEVs and CNG vehicles achieve emission reductions over conventional gasoline vehicles (on average 25% reduction for HEV and 5% reduction for CNG), but with some probabilities that either pathway is worse than conventional gasoline vehicles.…”