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The Effect of Gasoline Composition on Stoichiometry and Exhaust Emissions
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Abstract
Six full range gasolines were tested in two engines (one with a catalyst) operated at 4 steady states. Engine-out regulated emissions responded to equivalence ratio, Φ, in the accepted manner. For both CO and NOx, there was a characteristic, single emissions response to changes in Φ.
Changing fuel composition will primarily alter the production of these emissions by modifying the stoichiometric air/fuel ratio, projecting engine operation onto another part of the Φ response curve. These Φ effects, which are independent of engine design, also determine how operating conditions affect engine-out CO and NOx.
Speciated hydrocarbon measurements at engine-out and tail-pipe confirm results seen in previous test-cycle based programmes.
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Citation
McDonald, C., Lee, G., den Otter, G., Shore, P. et al., "The Effect of Gasoline Composition on Stoichiometry and Exhaust Emissions," SAE Technical Paper 941868, 1994, https://doi.org/10.4271/941868.Also In
Gasoline: Composition and Additives to Meet the Performance and Emission Requirements of the Nineties
Number: SP-1054; Published: 1994-10-01
Number: SP-1054; Published: 1994-10-01
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