Abstract
This thesis proposed a novel Split-Cycle air engine that was composed by one smaller and one larger cylinders. This two-cylinder air engine has two expansion strokes in the larger cylinder to make full use of high pressure air. Therefore, the power and efficiency of air engine were raised. Simulation in this research used MATLAB to establish Split-Cycle air engine model and use the model to analyze the cylinder pressure, power, torque, efficiency in various turning speed, valve timing and compression ratio. Then the characteristics of Split-Cycle air engine obtained from simulation were verified with experiments. In addition, the experiment found that the high pressure tube between two cylinders influenced the power and torque outputs of Split-Cycle air engine, so the effect of diameter of high pressure tubes on the performance of the engine was investigated. Finally, this research used the experimental data to conduct emulation of single cylinder air engine and Split-Cycle air engine based on the configuration of KYMCO MONGOOSE 90, then pros and cons of both engines were compared.