Research of diesel bus performance when using diesel biofuel

Abstract

Problem. The article focuses on the use of diesel biofuel to expand the fuel base and improve ecological indicators of diesel buses. Goal. The study aimed to refine the mathematical model of bus movement in urban driving modes to determine fuel-economic and ecological indicators of the bus when using traditional diesel fuel and diesel biofuel. Methodology. Experimental studies were conducted on motor-tractor diesel 4CH11.0/12.5 (D-241) to determine its fuel economy and ecological indicators when running on both fuels, checking the adequacy of polynomial models of the diesel. Practical tests were performed on PAZ-32054 buses with diesel engines to verify the refined mathematical model on both fuels. Results. The study showed that diesel biofuel could be used in motor-tractor diesel engines without requiring any changes in their construction. However, hourly and specific consumption of diesel biofuel increased by 11-16% compared to traditional diesel fuel across a wide range of speed and load modes. The concentrations of carbon monoxide (CO) and hydrocarbons (CmHn) varied depending on the diesel engine's load. With an increase in the load, the concentrations of CO and CmHn were lower by 3% and 23%, respectively, compared to traditional diesel fuel. The study concludes that diesel biofuel is a practical alternative for diesel engines, which can be an important step towards improving the ecological situation in urban areas. By reducing the consumption of traditional diesel fuel, diesel biofuel can also help in diversifying the fuel base of diesel buses. Originality. The originality of the study lies in its experiments to prove the practical use of diesel biofuel in diesel engines and in demonstrating its ecological benefits. Practical value. The practical significance of the study is the possibility of using diesel biofuel in existing diesel engines without the need for major changes to the engine's construction.