A New Clean Diesel Technology: Demonstration of ULEV Emissions on a Navistar Diesel Engine Fueled with Dimethyl Ether

A new, ultra-clean alternative fuel for diesel engines-a blend consisting predominantly of dimethyl ether (DME)- has been identified and evaluated by the authors. This paper reports engine test results with DME blends at emissions levels that will meet and surpass the California Ultra Low Emissions Vehicle (ULEV) regulation for medium-duty vehicles. In addition, fuel properties, potential costs and engine conversion requirements are discussed. The use of this fuel for commercial trucks and buses is the primary focus of the paper, but application to diesel passenger cars is also considered.