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The preparation of the fuel-air mixture and the control of ignition are critical factors in achieving low-emission combustion, particularly in the context of zero-emission vehicles, which aim to minimize harmful pollutants and maximize energy efficiency. While zero-emission vehicles primarily refer to electric vehicles, the underlying principles of combustion efficiency and emissions control are highly relevant to hybrid and fuel cell systems, as well as to the broader goal of sustainable propulsion technologies. Proper management of the fuel-air mixture and ignition timing directly affects the formation of nitrogen oxides (NOx), carbon monoxide (CO), unburned hydrocarbons (HC), and particulate matter, all of which are targets for emission reduction strategies. Fuel-air mixture preparation involves the process of mixing the fuel with the correct proportion of air to ensure complete and efficient combustion. In internal combustion engines, a stoichiometric mixture, where the fuel and oxygen are in ideal proportion, allows for the most complete combustion, minimizing the production of CO and HC. If the ____ _____ _______ _______ _____ ___.
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