低黏度柴油机油燃油经济性的评价

Evaluation on Fuel Economy of Low Viscosity Diesel Engine Oils

随着节能法规的强制执行,商用柴油车越来越关注柴油机油的燃油经济性。使用低黏度的柴油机油是提高柴油发动机燃油经济性的有效方法之一。对柴油机油的理化性能,模拟试验结果与柴油机台架试验(WHTC循环及C-WTVC循环)的相关性进行了探讨。黏度(100℃运动黏度)较低的柴油机油较黏度较高的柴油机油有更好的燃油经济性(FA-45W-30柴油机油较E4/E710W-40柴油机油可以获得1.1%以上的燃油经济性),降低高温(80℃,100℃)高剪切(10^(6) s^(-1))黏度有利于提升台架试验燃油经济性结果。添加二烷基二硫代氨基甲酸钼(MoDTC)摩擦改进剂可以在一定程度上提升柴油机油的燃油经济性。柴油机油的SRV(90℃,25 Hz,200 N,60 min,1 mm)摩擦因数越小,在C-WTVC循环台架试验(绝对油耗试验和比油耗试验)中的燃油经济性越好,两者具有良好的相关性。通过理化性能,模拟试验和台架试验的相关性分析,可以为研制低黏度的节能柴油机油提供思路和评价方法。

With the enforcement of energy conservation regulations,the fuel economy of Diesel engine oils were paid more and more attention by commercial Diesel vehicles.It was one of the effective ways to improve the fuel economy of Diesel engine by using low viscosity Diesel engine oils.The physicochemical performances of Diesel engine oils,the correlation between simulation test results and bench test(WHTC cycle and C-WTVC cycle)were discussed.The Diesel engine oils with lower viscosity(100℃kinematic viscosity)had better fuel economy than the Diesel engine oils with higher viscosity(FA-45w-30 Diesel engine oils could obtain more than 1.1%fuel economy than E4/E710W-40 Diesel engine oils).It was beneficial to improve the fuel economy result by reducing high temperature(80℃,100℃)high shear(10^(6) s^(-1))viscosity.The fuel economy of Diesel engine oils could be improved by adding molybdenum dialkyl dithiocarbamate(MoDTC)friction modifier.The smaller the SRV(90℃,25 Hz,200 N,60 min,1 mm)friction coefficient of Diesel engine oils was,the better fuel economy in bench test of C-WTVC cycle(absolute fuel consumption test and specific fuel consumption test)was.It had better correlation between SRV result and C-WTVC cycle bench test result.Through the correlation analysis of physicochemical performances,simulation test and bench test,it could provide ideas and evaluation methods for the development of low viscosity energy conservation Diesel engine oils.