This paper presents the results of study and development of an electronically controlled LPG injection system on the AVL 5402 one-cylinder diesel engine fueled with dual fuel LPG/diesel. With the de velopped electronic LPG control unit (ELC) and control software, it is easy to determine and establish a set of optimum control parameters of LPG injection under different engine loads and speeds. This helps to determine the appropriate proportion of LPG in total dual fuel LPG/diesel consumption under different engine operating conditions. The LPG injection pressure is 1.5 bars, Under the engine full load performance, the applicable proportion of LPG can be 30 percent
under low engine speeds this proportion can be even higher. The study also indicated that the total dual fuel consumption is less than fuel consumtion in the case of using single fuel of diesel
the engine vibration increase with increasing LPG proprtion.