VERIFICATION OF POWERTRAIN CONTROL SYSTEM SOFTWARE CONTENTS IN HIL ENVIRONMENT FOR DIESEL ENGINE E6D In the general contest of the increasing application of electronic technologies to vehicles and of the more stringent requirements on pollutants emission control, the purpose of this thesis work is to analyze the state of art of current diesel engine systems dedicated to NOx reduction from architecture and software strategies point of view and realize, with a proper methodology and on the base of specific requirements and software weaknesses, an activity of first validation aimed to guarantee the effectiveness of these strategies and to avoid all possible negative impacts on the final customer.