To meet the requirements of strict fuel consumption and emission limits, continuously increasing the thermal efficiency of\nan internal combustion engine and decreasing its exhaust emissions are the main challenges to its sustainable development\nwithin the automotive industry. Considering the competition with other zero-emission powertrain systems, such as vehicle\nbatteries and fuel cells, the development of the internal combustion engine needs to focus on producing higher efficiency and\nzero emissions to meet the request of CO2 reduction. This paper introduces two novel concepts for an internal combustion\nengine featuring high efficiency and zero emissions. Referred to as the argon power cycle engine fueled with either hydrogen\nor natural gas within an oxygenââ?¬â??argon mixture, its fundamentals and characteristics are expounded. This includes a method\nnecessary to absorb carbon dioxide when natural gas is used as fuel instead of hydrogen.
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