The article presents the results of research on a dual-fuel spark-ignition engine with multi-point injection of alcohol and gasoline near the intake valve. The engine was supplied through a prototype intake system featuring dual electronically controlled injectors. The system used allows the engine to run on gasoline or alcohol alone, as well as the simultaneous combustion of a mixture of both fuels with any proportion of alcohol. The tests were performed on a 4-cylinder Fiat 1100 MPI spark-ignition engine. The article presents comparative results of engine performance parameters when fueled with a dual-fuel system with varying proportions of methyl alcohol. The research showed a beneficial effect of alcohol addition on engine efficiency and exhaust toxicity, especially for higher alcohol proportions and engine loads. Ethyl and methyl alcohols have been used in reciprocating spark-ignition engines for several decades. Initially, they were used as additives to hydrocarbon fuels due to their high anti-knock resistance and high heat of vaporization [1-6]. Thanks to these properties, it was possible to increase the compression ratio and engine performance, which was significant in high-output engines, especially in sports. Renewed interest in alcohols has been observed for years (…)
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Source: Logistyka Magazine