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SMAT2008E15THE LPG USE IN DIESEL ENGINEConstantin PANA, Niculae NEGURESCU, Marcel Ginu POPA,Alexandru CERNAT, Dorin SOARE, Petre DESPA, Florin BUJGOIAbstract: The LPG is an alternative fuel with real future opportunities due to the following aspects: the NO xemission level is lower; the PM emission is indistinguishable; CO 2 emission is maintained to the same level; the enginepower is the same; the automotive autonomy increase; the HC and CO emissions level increases, but the registeredvalues respects EURO 4 norms; LPG protects the particles filter and environment because don’t contains sulphur; theinfrastructure for LPG distribution already exists. Is advantageous to use LPG in diesel engine in order to reduce thepollutants emissions levels and to increase thermal efficiency which is directly related with CO 2 emission level but isvery difficult to use only LPG because of its higher auto ignition endurance (CN = -2….-3). In that case is necessary touse peroxides additives for LPG but the explosion danger is very high. Another impediment appears at the liquid LPGdirect injection: poor oiling properties for LPG comparative to diesel fuel. This deficiency is eliminated by additivesuse or by special covering of the mobile components of injection system, inside surface of the pump cylinder andinjector nozzle with fluorine-polymeric substances. These disadvantages are removed through the use of the diesel gasmethod proposed by authors: the LPG is injected in gaseous phase in the front of the inlet valve and one small quantityof diesel fuel is injected into combustion chamber assuring the ignition of the air-LPG mixture. The injection of LPG inthe front of the inlet valve provides a precise LPG dose control and all the injectors are electronic actuated. The enginekeeps up its classic diesel fuelling system which is adjusted for dual fuelling. The electronic control unit for the LPGinjection system (EU-LPG) is attached by the engine Electronic Control Unit (ECU) and the engine electronic controlis provided by the communication between those two electronic control units. This fuelling method is very easy to implyto the existing engines or to the new engines.The paper presents some theoretical and experimental results obtained by authors from a research programdeveloped for an automotive diesel engine with 1500 cm 3 displacement fuelled by diesel-gas method.Keywords: engine, combustion, cetane number, pollutants, efficiencyConstantin PANA, professor dr.eng., University POLITEHNICA from Bucharest,e-mail constantinpana@yahoo.com phone :0214029451Niculae NEGURESCU, professor dr.eng., University POLITEHNICA from Bucharest,e-mail nnegurescu@yahoo.comphone : 0214029451Marcel Ginu POPA, professor dr.eng., University POLITEHNICA from Bucharest,e-mail mp_mot@yahoo.com phone :0214029451Alexandru CERNAT, assistent drd.eng., University POLITEHNICA from Bucharest,e-mail cernatalex@yahoo.comphone : 0214029451Dorin SOARE, drd.eng., University of Pitesti, e-mail dorin_soare@yahoo.com phone : 0744336119Petre DESPA, eng., SC MASTER Buchareste-mail pdespa@mastertt.rophone : 0214340845Florin BUJGOI., eng. SC MASTERTUNER SRL Bucharest,e-mail florin@mastertuner.rophone: 072227552249