|Title||Sangwook Han, Euijoon Shim, Jinyoung Jang, Jungseo Park and Choongsik Bae, "Low Temperature Diesel Combustion with Pilot Injection", The 7th JSME-KSME TFEC, Sapporo, Japan, Oct, 2008|
Sangwook Han, Euijoon Shim, Jinyoung Jang, Jungseo Park and Choongsik Bae, “Low Temperature Diesel Combustion with Pilot Injection”, The 7th JSME-KSME TFEC, Sapporo, Japan, Oct, 2008
A commercial direct injection diesel engine with large amount of exhaust gas recirculation system was used to investigate low temperature diesel combustion. One of the drawback of low temperature diesel combustion is higher hydrocarbon emission compared with conventional diesel combustion. Pilot injection strategy was adopted in low temperature diesel combustion to reduce increased hydrocarbon emission. Combustion characteristics and exhaust emissions of low temperature diesel combustion under different pilot injection quantities, pilot injection timings and injection pressures were investigated. Retarding pilot injection timing and increasing pilot injection quantity advanced main combustion timing and increased peak heat release rate of main combustion. Hydrocarbon emission was reduced by the retardation of pilot injection and by the increased quantity of pilot injection. Higher injection pressure was also effective to reduce hydrocarbon emission. Soot emission was increased with retarded pilot injection timing while hydrocarbon emission was decreased. However, the effect of pilot injection on nitrogen oxides emission was negligible under low combustion temperature condition.