Low-temperature combustion (LTC) is an alternative combustion mode to conventional diesel combustion (CDC) that offers a simultaneous reduction in oxides of nitrogen (NOx) and particulate matter (PM) emissions while retaining higher thermal efficiency. Premixed charge compression ignition (PCCI) is a promising LTC strategy that utilizes the early direct injection of diesel and high exhaust gas recirculation (EGR) to reduce NOx and PM emissions simultaneously. A limited operating load range and high unburned hydrocarbon (HC) and carbon monoxide (CO) emissions are the significant shortcomings to be addressed to realize PCCI as a commercially viable option. The present work aims to address these limitations based on experimental and numerical investigations. Experiments were conducted in a production light-duty diesel engine by modifying the existing mechanical fuel injection system with a flexible injection schedule based common rail direct injection (CRDI) system. Based on initial parametric investigations, it was found that a combination of early direct injection, lower injection pressures, and high EGR was deemed necessary to achieve PCCI mode in the current engine. However, the achievable load range was limited to 40% of the rated load, along with high HC and CO emissions. Novel approaches are attempted to address these limitations, including replacing diesel with diesel-gasoline blends and utilizing a dual charge dilution strategy with water vapour induction and EGR. By combining these strategies, the engine operating load range could be extended from 40% to 80% of the rated load in PCCI. However, the high HC and CO emissions problems remained. To address this limitation, the concept of narrow-angle direct injection (NADI) was studied numerically using CONVERGE CFD software at different load conditions. The results show significant HC and CO emission reduction with high thermal efficiency at low loads using NADI. However, with increasing load, NADI leads to a slight decrease in HC with more elevated CO and soot emissions. Subsequently, split injections combined with NADI were investigated, which resulted in a significant reduction in HC and CO emissions. The scientific reasons behind the obtained benefits in PCCI will be discussed in the seminar talk.