This invention relates to a compression ignition internal combustion engine capable of operating on both diesel and gasoline fuels. The proposed technology addresses the dual challenges of high NOx and soot emissions from diesel engines and low thermal efficiency from gasoline engines by integrating a control system that enables non-simultaneous operation in diesel direct injection (DI) mode and gasoline homogeneous charge compression ignition (HCCI) mode. This system ensures seamless transitions between modes without the need for simultaneous fuel injection, thereby simplifying engine control mechanisms and improving fuel efficiency. The innovation stands out by requiring minimal modifications to existing engine designs, making it a cost-effective and practical solution for a variety of applications, including automotive, power generation, agricultural machinery, and industrial machinery. The prototype demonstrates stable performance across different load conditions, significantly reducing harmful emissions and contributing to cleaner air and better public health. This technology offers a viable pathway to achieving higher fuel efficiencies and lower operational costs, benefiting both the environment and the economy.