Introduction:
Ghoornie Technologies introduces a Rotary SI engine
having the highest IC engine fuel efficiency ever, better than any variable compression ratio engine and gasoline-electric hybrid engines, even better than CI engines.
About 48% reduction in fuel consumption at typical driving conditions is calculated in comparison to conventional SI engines (Fig.-1). The engine is a split cycle phase variable rotary spark ignition engine that can start combustion before top dead center (bTDC) without compressing burning gas. The engine compresses only air; though, it is preferably not a direct injection engine. The engine can run efficiently on stoichiometric air-fuel mixture at all loads. The split cycle rotary have high over expansion cycle which adds significant benefit to engine's fuel efficiency at typical drive conditions.
But, this is not the only reason behind the claimed
efficiency; rather, a unique charging method of this engine adds a very significant benefit over the entire load conditions. The charging method produces such initial expansion chamber conditions that at full load it results in more than 17% higher peak cylinder pressure than the conventional reciprocating engine against equivalent cylinder temperature. The pressure-temperature ratio increases to more than 130% higher than conventional engines at ordinary drive conditions (Fig.-2). This condition results in much higher work output by means of converting more heat energy to useful work, which leads to more rapid drop in expansion chamber temperature and thus results in less heat loss to the coolant. Equivalent peak power to that of a conventional engine is attainable with the rotary engine that is downsized by 29.1% and over-speeding by about 27%; whereas, typical power requirements are attainable at similar RPM. |
