Engine-Out Emissions Characteristics of a Light Duty Vehicle Operating on a Hydrogenated Vegetable Oil Renewable Diesel 2020-01-0337
Hydrogenated vegetable oil (HVO) is a promising biofuel that can be produced by means of a refinery-based process that converts animal fats and vegetable oils into paraffinic hydrocarbons. The purpose of this work is to investigate the engine-out emissions characteristics of HVO from a current technology diesel vehicle to better understand the emissions performance of HVO as a drop-in fuel. Two fuels were used in this study, including an Ultra Low Sulfur Diesel (ULSD) and a neat HVO to evaluate one light-duty diesel truck equipped with common rail direct injection. The HVO fuel contained 98.5 vol % of HVO and 1.5 vol % petroleum; and is hereinafter, the fuel denoted as HVO. Although the vehicle was equipped with a diesel particle filter (DPF) and selective catalytic reduction (SCR) aftertreatment systems, all emissions sampling occurred before the catalyst. The vehicle was tested at least twice on each fuel using the LA-92 drive cycle and at steady-state conditions at 30 miles per hour (mph) and 50 mph at different loads. Engine-out emissions measurements were made for total hydrocarbons (THC), oxides of nitrogen (NOx), carbon monoxide (CO), carbon dioxide (CO2), particulate matter (PM) mass, soot mass, solid particle number (SPN), and fuel economy.
Cavan McCaffery, George Karavalakis, Tom Durbin, Heejung Jung, Kent Johnson