Study of the effect of altitude on the emissions of exhaust gases in spark-ignition engines
DOI:
https://doi.org/10.14482/inde.38.1.629.25Keywords:
Altitude effect, Emissions, Exhaust gases, Spark-ignition engineAbstract
This research project shows the effect of altitude on the emissions of polluting gases from a spark ignition engine (SI engine), considering that in Ecuador and in Latin America, there are topographic variations that affect the conditions of vehicle’s operation. This work analyzes the emissions of polluting gases generated by a SI engine operating at different heights above sea level. Altitude is a very important factor in the performance of SI engine and in the emissions that it produces. Measurements were developed in three cities with different height above sea level (0, 2200 and 3000 masl), at four engine revolutions (idle, 2000, 3500 and 4500 rpm) and at the same hour of the day. The emissions of carbon monoxide (CO), carbon dioxide (CO2) and unburned hydrocarbons (UHC) were measured. The results showed that the engine revolutions are the most important factor in the emission of CO and UHC; as the rpm increase, the percentage of CO is higher and the amount of UHC is reduced; however, in CO2 emissions, altitude has a more significant effect, decreasing as atmospheric pressure drops. Consequently, it is expected that the results achieved will promote future works to reduce emissions harmful to human health.
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