The effects of LPG use over the performance of a Diesel engine

Abstract

This study is based on the effects of using an auxiliary fuel such as gas on the performance of diesel engines. More attempts to use gas as a secondary fuel in a diesel engine were made over the years, resulting in significant increases of the engine performance. Other effects of dual fuel use, are lower fuel consumption, and an improved combustion, that has a direct effect on pollutant emission. For this investigation a 4-cylinder diesel engine with mechanical injection, equipped with a speed regulator disable system. An auxiliary fuel (gas) is introduced through the intake manifold of the engine using a volume base measurement system. According to the literature, by increasing the main injection advance, we can see further improvement in the engine performance, this being a result of better timing of the burn process. The regular burn process uses only a part of the oxygen in the cylinder, by introducing the gas in the intake, it uses the rest of the oxygen in the cylinder in the burn process. This in theory will improve the efficiency of the engine and thus reduces the emissions.