Emissions of Euro 6 mono- and bi-fuel gas vehicles

Compressed natural gas (CNG) and liquefied petroleum gas (LPG) are included in the group of promoted transport fuel alternatives in Europe. Most studies on emissions factors are based on old technology CNG and LPG fueled vehicles. Furthermore, there are not many data at low ambient temperatures, on-road driving, or unregulated pollutants such as ammonia (NH3). In this study we measured the emissions of one Euro 6b CNG light commercial vehicle, one Euro 6b and one Euro 6d-Temp bi-fuel LPG passenger car, one Euro 6d-Temp bi-fuel CNG passenger car, and four Euro 6d-Temp CNG passenger cars. Tests included on-road testing and worldwide harmonized light vehicles test cycles (WLTC) in the laboratory with cold and hot engine, at 23 °C and -7 °C. The results showed 10-23% CO2 savings in gas modality compared to gasoline, lower CO and particle number emissions and relatively similar total and non-methane hydrocarbons and NOx emissions. The ammonia emissions were elevated for all vehicles and fuels. The results also showed in general following the introduction of the real-driving emissions regulation, even though not applicable to the examined vehicles, Euro 6d-Temp vehicles had lower emissions compared to the Euro 6b vehicles.

GIECHASKIEL Barouch;  LAHDE Tero;  CLAIROTTE Michael;  SUAREZ BERTOA Ricardo;  VALVERDE MORALES Victor;  MELAS Anastasios;  SELLERI Tommaso;  BONNEL Pierre; 

2022-06-16

MDPI

JRC129601

2073-4344 (online),   

https://www.mdpi.com/2073-4344/12/6/651,    https://publications.jrc.ec.europa.eu/repository/handle/JRC129601,   

10.3390/catal12060651 (online),