Research Progress of Two-Stroke Internal Combustion

In a world that is gradually moving towards renewable sources of energy, the 2-stroke motor with it is low efficiency and high emission is being phased out. However, there are some applications which require the unique characteristics of the 2-stroke motor, making it the only suitable form of power for those applications. This paper will discuss the operating principle of the 2-stroke motor, how its construction is able to be simplistic and light, and how it has a high power-to-weight ratio. This paper will also discuss the relatively inefficient scavenging process caused by the simplistic nature of the 2-stroke engine, leading to high emission, low efficiency, short engine life, and noise. To solve these problems, mechanical solutions such as electronically controlled direct injection, delayed charging, and variable compression have been developed and are now common, while recent research into the use of bioethanol and hydrogen as fuel can further decrease emissions and increase efficiency. Therefore, the purpose of this paper is to summarize past and recent research regarding the strengths and limitations of 2-stroke internal combustion engines and the future developmental direction of 2-stroke engines in alternative fuel.