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Combustion of ammonia alone does not produce carbon dioxide which is a very important greenhouse gas. Ammonia can also be produced from
renewable sources such that it can be an attractive fuel to displace petroleum fuels. We have previously demonstrated that ammonia can
be burned in a diesel engine as a result of an Iowa Energy Center-sponsored project. Research was further carried to develop an ammonia flow rate control mechanism and investigate the combustion efficiency and exhaust emissions in the present project. In our approach, vapor ammonia was introduced into the intake manifold and diesel fuel was directly injected into the cylinder to ignite the mixture. This “dual-fuel” approach was chosen because ammonia has a high resistance to autoignition. This approach was proven successful and only required minor modifications to the engine intake system.