EMISSIONS CHARACTERISTICS OF ETHYL AND METHYL-ESTER OF RAPESEED OIL COMPARED WITH LOW-SULFUR DIESEL CONTROL FUEL IN A CHASSIS DYNAMOMETER TEST OF A PICKUP TRUCK

Comprehensive tests were performed on an on-road vehicle in cooperatio n with the Los Angeles County Metropolitan Transit Authority emissions test facility. All tests were with a transient chassis dynamometer. T ests included both a double arterial cycle of 768 s duration and an EP A heavy duty vehicle cycle of 1,060 s duration. The test vehicle was a 1994 pickup truck with a 5.9-L turbocharged and intercooled, direct i njection diesel engine. Rapeseed methyl (RME) and ethyl esters (REE) a nd blends were compared with low sulfur diesel control fuel. Emissions data includes all regulated emissions: hydrocarbons (HC), carbon mono xide (GO), carbon dioxide (CO2), oxides of nitrogen (NOx), and particu late matter (PM). In these tests the average of 100% RME and 100% REE reduced HC (52.4%), CO (47.6%), NOx (10.0%), and increases in CO2 (0.9 %) and PM (9.9%) compared to the diesel control fuel. Also, 100% REE r educed HC (8.7%), CO (4.3%), and NOx (3.4%) compared to 100% RME.