1. The green engine is a new type of internal combustion engine that uses a six-phase pistonless design to achieve higher efficiency and nearly zero emissions compared to conventional engines. 2. It works by using strong swirling of air and fuel to enable direct injection and mixing, followed by constant volume combustion with a controllable time. 3. The green engine has advantages like small size, lower costs, ability to use multiple fuels, and reduced pollution compared to conventional engines.