四行程機車使用多壁奈米碳管∕二氧化矽複合奈米潤滑油之磨潤、引擎性能及PM2.5排放研究

:In this study, two different types of nanoparticles (SiO2 and MWCNT) were added to the base engine oil (20W40), which using on four-stroke motorcycle. A total of 2.1, 2.15, 2.2, 2.6, 2.65 and 2.7 wt.% of hybrid nano lubricant were tested in this study. Finally, 2.65 wt.% with better comprehensive effect was selected. In the tribology experimental and the thermal conductivity experiment has an average reduction of 37.8 % and 12.3% compared with the base oil. In the vehicle experiment, the average fuel consumption (km/L) increased by 7.5 %, and the speed of the flat road and the climbing (four-degree slope) increased by 9.5 and 8.7%. The temperature characteristics during the driving test, the cylinder wall and the oil temperature was reduced by 6.3% and 6.9%, the exhaust temperature was increased by 26.6 %. In the exhaust emissions, the total amount of HC and CO decreased by 22.5 % and 26.1 %, the CO2 emission increased by 3.9 %, and the PM value increased by 47.3 % under the particle size of 2 μm. Experiments have confirmed that the hybrid nano lubricant can provide better lubrication to make the engine burn more completely and better heat dissipation.