Abstract
Abstract Hydrogen, gasoline, and mixtures thereof were compared as fuels for lean-burn engines. Hydrogen for the mixed fuels tests was generated by partial oxidation of gasoline. Hydrogen combustion yielded the highest thermal efficiency at any NO x level. Gasoline yielded the second highest thermal efficiency for NO x levels greater than or approximately equal to 2 g/mile. For lower NO levels and high vehicle inertia weights, progressively more hydrogen supplementation was the second most efficient system. For vehicle inertia weights below 5000 lbm (2300 kg), the statutory NO standard (0.4 g/mile) could be met with one lbm/h (0.13 g/s) hydrogen supplementation.
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