95/02104 BMS helps BT to make the right connections

Abstract

This study has investigated the influence of injection pressure on combustion characteristics and exhaust emissions of a compression ignition engine. The engine was fueled with gasoline, thus named as gasoline compression ignition (GCI) engine. The single-cylinder diesel engine based on the Hyundai commercial engine was used throughout the experiment. Pure gasoline mixed with 5 percent of biodiesel as lubricity enhancer was injected into the cylinder with varying injection pressure. The injection pressures were set at 600 and 1000 bar while the start of injection and injection duration were altered to control the same equivalent ratio (λ=1). To run at the low speed condition, the engine speed was fixed at 1,200 rpm. In addition, other engine parameters including engine oil, coolant water and intake air temperature, were also controlled in specific range. To understand the combustion characteristics such as heat release rate (HRR), thermal efficiency and burning duration, in-cylinder pressure data collected by means of pressure transducer were analyzed with one-zone thermodynamic model. Also, the exhaust emissions (NOx, THC, and CO were measured as well. The results show that the complete combustion was achieved at the high injection pressure. Combustion stability in terms of lower COV was improved with the increase injection pressure. In addition, the exhaust emission (NOX and THC) were decreased.