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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 mixture is too rich, meaning there is excess fuel, incomplete combustion occurs, resulting in higher emissions of CO and HC. Conversely, a lean mixture, with excess air, can increase NOx formation due to higher combustion temperatures. Therefore, precise control over the fuel-air ratio is essential. Technologies such as electronic fuel injection (EFI) have greatly enhanced the ability to achieve accurate mixture preparation by continuously adjusting fuel delivery based on real-time data from oxygen sensors and engine operating conditions. In zero-emission _______ _____ ______ _____ ____ ___ __________ ___ ________ _____ ____ _____.
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