▎ 摘　　要

The friction and wear of the worn surfaces is a principal cause of energy dissipation in automobile engines. Therefore, the objective of this work was to improve the tribological behavior using graphene (Gr) nanolubricant designed for saving energy and reducing the exhaust emissions. Anti-friction and anti-wear properties of Gr nanolubricant have been evaluated using tribometer based on ASTMG181. Herein, we present the self-healing mechanism responsible for the tribological events. To link tribological tests with factual engine performance, the engine performance was evaluated utilizing AVL dynamometer under New European Driving Cycle (NEDC). The tribological results showed that the lubrication via Gr nanolubricant improves the anti-friction and anti-wear properties by 29-35% and 22-29%, respectively, during boundary lubrication system. The engine lubrication using Gr nanolubricant revealed reducing cumulative fuel mass consumed by 17% with road load simulation during NEDC test. Furthermore, the exhaust emissions (CO, CO2, HC and NOx) were decreased by 2.79-5.42%, as compared to the reference oil.