Abstract—Alternative fuels for diesel engines are being researched to reduce diesel consumption and exhaust pollution. As a result, the study examines the performance and exhaust emissions of a Common-Rail Direct Injection (CRDI) diesel engine when running on diesel combined with bioethanol injection and air preheating at a constant speed and load. The injection of bioethanol and preheated air were increased from 10 to 50 ms and 50 to 60 ℃, respectively. Diesel paired with bioethanol injection at 30ms and air preheating at 60 ℃ improved engine performance compared to diesel-only mode, increasing brake thermal efficiency and diesel savings by 3 % and 15 %, respectively. This scenario significantly reduced carbon dioxide, black smoke, particulate matter, and nitrogen oxide emissions by 3 %, 2 %, 3 %, and 34 %, respectively. Carbon monoxide was only added in 12 %.
Keywords—bioethanol, CRDI diesel engine, diesel, engine performance, exhaust emissions
Cite: Pisak Chermprayong, Ekkachai Sutheerasak, Worachest Pirompugd, Mattana Santasnachok, and Sathaporn Chuepeng, "Bioethanol Injection and Air Preheating on the Performance and Exhaust Emissions of a CRDI Diesel Engine," International Journal of Environmental Science and Development vol. 17, no. 1, pp. 9-18, 2026.
Copyright © 2026 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).