Study of performance, combustion and emission characteristics of diesel homogeneous charge compression ignition (HCCI) combustion with external mixture formation

An experimental study on premixed charge compression ignition-direct ignition engine fueled with ethanol and gasohol

“…The maximum peak pressure of 72.60, 68.85 and 68.2 bar occurs at 6°, 7°and 8°aTDC for premixed gasohol, ethanol and neat diesel fuel. The cylinder peak pressure and maximum rate of pressure rise for premixed gasohol were found as higher due to improvement in premixed combustion due to increased flame rapidity that leads to a complete combustion [2]. Another reason might be higher energy release rate, so the peak cylinder pressure shifted 1°and 2°CA bTDC and it is slightly away from the diesel peak pressure regime for premixed ethanol and gasohol fuel.…”

“…Particulate emission can be reduced significantly due to homogeneous charge combustion. Even though HCCI has the advantage of a high emission reduction potential and improved fuel economy, it has many challenges such as obtaining the homogeneous mixture and controlled auto ignition [2]. Many institutes have already studied HCCI, but only a few of them performed experiments using biodiesel as a potential alternative fuel [3].…”

“…A lot of researches have been performed in this field [1][2][3][4][5][6][7][8][9][10]. However, this concept has major challenges such as combustion initiation and combustion duration control.…”

“…However, this concept has major challenges such as combustion initiation and combustion duration control. To overcome these difficulties a lot of work has been carried out in the field of HCCI mode by varying inlet air heating [1], Variable Compression Ratio (VCR) [2] and Variable Valve Actuation (VVA) [9] to alter the effective compression ratio and to trap the residual gases respectively. The Exhaust Gas Recirculation (EGR) rates are also varied to reduce the heat release rate and as a result to control the combustion at higher loads [6].…”

Control of combustion process in an HCCI-DI combustion engine using dual injection strategy with EGR

“…An inter-128 esting observation suggested that transition from conventional to 129 premixed charge compression ignition (PCCI) during high load 130 operation was possible by varying the fuel injection timing [30]. 131 Ganesh et al [31,32] reported that using external mixture forma-132 tion they were able to achieve HCCI combustion with ultra low 133 emissions. The Single early injected HCCI combustion [33] would 134 have no control over the identifiable start of combustion and this 135 is recognised as one of the major problems in achieving controlled 136 HCCI combustion.…”