HYSYDAYS – 2ND WORLD CONGRESS OF YOUNG SCIENTISTS ON HYDROGEN ENERGY SYSTEMS HYSYDAYS – Turin 2007 1 Experimental Tests of Blends of Hydrogen and Natural Gas in Light Duty Vehicles

Main drivers for the introduction of hydrogen as a fuel for vehicles are the reduction of both greenhouse gases emissions and local pollutants, above all in congested urban environments. While the use of hydrogen in fuel cell vehicles will be the ultimate target for sustainable mobility, much attention has to be devoted to a suitable “bridge technology”, to accelerate the process of the introduction of these new technologies and in the meantime to build an infrastructure suitable for the utilization of hydrogen. In the short-medium term, the atmospheric emissions could be significantly reduced by using different percentages of hydrogen mixed with natural gas in internal combustion engines. The paper is based on the results of an experimental test campaign carried on in ENEA labs, aimed at identifying the prospective of the use of blends of natural gas and hydrogen (HCNG) in existing ICE vehicles. The tested vehicle is a Iveco Daily CNG, originally fuelled with natural gas and the tests had been made on the ECE15 driving cycle comparing the emission levels of the original configuration (CNG) with the results obtained with different blends (percentage of hydrogen in the fuel) and control strategies (stoichiometric or lean-burn). Also the steady results, that were used for tuning the engine from CNG to HCNG are reported