Engine Mileage on Emissions of an Aged Retrofitted Spark Ignition Engine Fueled with Gasoline and Compressed Natural Gas
| dc.contributor.author | Kyando, Michael | |
| dc.contributor.author | Ntalikwa, Justin | |
| dc.contributor.author | Kivevele, Thomas | |
| dc.date.accessioned | 2025-10-08T05:46:01Z | |
| dc.date.issued | 2025-06-24 | |
| dc.description | SDG- 13: Climate Action | |
| dc.description.abstract | This study investigates the critical issue of rising emissions from aged retrofitted spark ignition (SI) engines, particularly as vehicle mileage increases. The objective is to analyze how engine mileage influences the emissions profiles of these engines when fueled by gasoline and compressed natural gas (CNG). Using an aged bi-fuel engine, the study measures emissions after every 5000 km of operation for both fuel types and compares them by EURO IV standard. As the engine mileage increases, key findings indicate that both gasoline and CNG engines meet EURO IV limits for carbon monoxide (CO) emissions, with gasoline engines showing a significant improvement over time (from 0.59 to 0.18%), while CNG engines consistently maintain lower emissions (0.12 to 0.02%). Carbon dioxide (CO2) emissions from gasoline engines increase as efficiency improves (from 14.4 to 15.6%), whereas CNG emissions show a notable decrease from 15.93 to 11.33%. Additionally, hydrocarbon (HC) emissions exhibit a similar trend, reflecting enhanced combustion efficiency in gasoline engines compared to CNG. Nitrogen oxide (NOx) emissions present a challenge for gasoline engines, which can exceed EURO IV limits, while CNG engines experience a more moderate increase in NOx levels. These findings highlight the environmental advantages of CNG as a cleaner fuel alternative and underscore the compliance challenges faced by both fuel types under stringent emissions regulations, emphasizing the importance of engine mileage in emissions management. | |
| dc.identifier.uri | https://doi.org/10.1007/s40825-025-00268-5 | |
| dc.identifier.uri | https://dspace.nm-aist.ac.tz/handle/123456789/3374 | |
| dc.language.iso | en | |
| dc.publisher | Springer Nature | |
| dc.subject | Engine mileage | |
| dc.subject | Exhaust emissions | |
| dc.subject | Compressed natural gas | |
| dc.subject | SI retrofitted engine | |
| dc.title | Engine Mileage on Emissions of an Aged Retrofitted Spark Ignition Engine Fueled with Gasoline and Compressed Natural Gas | |
| dc.type | Article |