EXPERIMENTAL INVESTIGATIONS ASPECTS OF THE FUELLING A TRUCK DIESEL ENGINE WITH LPG

The main objective of the paper is the pollutant emissions reduction of a truck compression ignition engine, by fuelling with liquefied petroleum gas (LPG) and by using a quantity of recirculated exhaust gases, without penalties over the performances of the engine. A specific objective of the paper is to establish a corelation between the substitute ratio of the diesel fuel with LPG and the optimum adjustments for the investigated regimens to limit the maximum pressure and smoke level, knock and rough engine functioning and having regard to decrease the fuel consumption and the level of the pollutant emissions. The paper envisages in particular the reduction of the nitrogen oxides emission and smoke, which represents the main problems of a diesel engine. The test bed situated in the Thermotechnics, Engines, Thermal Equipments and Refrigeration Instalations Department was adapted to be fuelled with  liquefied petroleum gas. The engine used is a turbocharged truck diesel engine with a 10.34 dm 3 displacement. The investigated working regimen was 55% load and 1450 rpm, and the energetic substitute ratios of the diesel fuel with LPG was situated between [0-30.37] %.