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Abstract：
The basic tribological experiments have reported that nano-graphene lubricating oil has excellent anti-friction and anti-wear properties, which has been widely concerned. However, the real anti-friction effect of nano-graphene lubricating oil and its impact on engine power performance, economic performance and emission performance remain to be proved. This has seriously hindered the popularization and application of nano-graphene lubricating oil in the engine field. In this paper, nano-graphene powder was chemically grafted to prepare nano-graphene lubricating oil with high dispersion stability. The influence of nano-graphene on physicochemical properties of lubricating oil was studied, and the influence of nano-graphene on engine power performance, economic performance and emission performance was explored. The results show that after modification, the dispersion of nano-graphene in lubricating oil is improved. Compared with pure lubricating oil, the addition of nano-graphene makes the kinematic viscosity of lubricating oil slightly lower, and has little effect on the density, flash point, pour point and total acid value of lubricating oil. The reversed towing torque of nano-graphene lubricating oil is reduced by 1.82-5.53%, indicating that the friction loss decreases. The specific fuel consumption of the engine is reduced, which indicates that the fuel economic performance is improved. Engine HC+NOX, CH4, CO2 emissions do not change much, but particulate matter (PM) emissions increase by 8.85%. The quantity concentration of nuclear particles, accumulated particles and total particles of nano-graphene lubricating oil are significantly higher than that of pure lubricating oil. And the increase of the quantity concentration of accumulated particles is more obvious than that of nuclear particles, and the larger the load, the more obvious this phenomenon. In order to apply nano-graphene lubricating oil to the engine, it is also necessary to further study its impact on the post-processing system, adjust the control strategy of the post-processing system and then test and calibrate.
摘要：
基本摩擦学实验已经报道,纳米石墨烯润滑油具有优异的减摩抗磨性能,受到广泛关注。然而,纳米石墨烯润滑油的真正减摩效果及其对发动机动力性能的影响,经济绩效和排放绩效仍有待证明。这严重阻碍了纳米石墨烯润滑油在发动机领域的推广应用。在本文中,化学接枝纳米石墨烯粉末,制备具有高分散稳定性的纳米石墨烯润滑油。研究了纳米石墨烯对润滑油理化性能的影响,以及纳米石墨烯对发动机动力性能的影响,探讨了经济绩效和排放绩效。结果表明,改性后,提高了纳米石墨烯在润滑油中的分散性。与纯润滑油相比，纳米石墨烯的加入使润滑油的运动粘度略低,对密度影响很小，闪点,润滑油的倾点和总酸值。纳米石墨烯润滑油的反向牵引扭矩降低1.82-5.53%，表明摩擦损失降低。发动机的比油耗降低，这表明燃料的经济性能得到了改善。发动机HC+NOX,CH4、CO2排放量变化不大，但颗粒物(PM)排放量增加了8.85%。核粒子的数量浓度，纳米石墨烯润滑油的累积颗粒和总颗粒明显高于纯润滑油。累积粒子数量浓度的增加比核粒子更明显，负载越大，这种现象越明显。为了将纳米石墨烯润滑油应用于发动机，还需要进一步研究其对后处理系统的影响，调整后处理系统的控制策略，然后进行测试和校准。
