An Experimental Investigation of Low-Octane Gasoline in Diesel Engines

Conventional combustion techniques struggle to meet the current emissions norms. In particular, oxides of nitrogen $(NOx)$ and particulate matter (PM) emissions have limited the utilization of diesel fuel in compression ignition engines. Advance combustion concepts have proved the potential to combine fuel efficiency and improved emission performance. Low-temperature combustion (LTC) offers reduced $NOx$ and PM emissions with comparable modern diesel engine efficiencies. The ability of premixed, low-temperature compression ignition to deliver low PM and $NOx$ emissions is dependent on achieving optimal combustion phasing. Diesel operated LTC is limited by early knocking combustion, whereas conventional gasoline operated LTC is limited by misfiring. So the concept of using an unconventional fuel with the properties in between those two boundary fuels has been experimented in this paper. Low-octane (84 RON) gasoline has shown comparable diesel efficiencies with the lowest $NOx$ emissions at reasonable high power densities (⁠$NOx$ emission was $1g/kWh$ at 12 bar BMEP and 2750 rpm).