Achievement of Stable and Clean Combustion Over a Wide Operating Range in a Spark-Assisted IDI Diesel Engine with Neat Ethanol 840517
Spark-assisted diesel engines operated with alcohol fuels usually display misfiring or knocking problems. This paper presents an analysis of the factors influencing the ignition characteristics of ethanol in a swirl chamber diesel engine with a multi-spark ignitor. In the experiments, cycle-to-cycle combustion variations and the degree of knocking were investigated by changing engine parameters over a wide operating range. The results of the investigations showed that stable ignition and smooth combustion is achieved when a flammable mixture is formed in the vicinity of the spark plug when only a small amount of the injected fuel has evaporated. By optimizing the design factors, operation with high efficiency and low exhaust emissions was achieved.
Citation: Murayama, T., Ogawa, H., Miyamoto, N., and Chikahisa, T., "Achievement of Stable and Clean Combustion Over a Wide Operating Range in a Spark-Assisted IDI Diesel Engine with Neat Ethanol," SAE Technical Paper 840517, 1984, https://doi.org/10.4271/840517. Download Citation