Abstract
The development of a sustainable powertrain requires improved thermal efficiency. Reducing frictional power losses through the use of ultra-low viscosity oil is one of the most effective and economical ways. To assess the potential for efficiency enhancement in a new generation of future engines using low-viscosity oils, a technical analysis was conducted based on numerical simulation and theoretical analysis. This study proposes a numerical method coupling the whole multi-dynamics model and lubrication model under mixed lubrication regimes. Then, load distribution was calculated numerically and verified experimentally. Finally, this paper compares the bearing load and frictional energy loss of the main bearings when using The Society of Automotive Engineers (SAE) 15W40 and SAE 0W20 oil. The results indicate that the application of ultralow-viscosity lubricant can reduce the hydraulic friction loss up to 24%, but the asperity friction loss would increase due to the reduction in load capacity. As a result, the design of a new generation of high efficiency internal combustion engines requires careful calculation and design to balance the trade-off relations between hydraulic friction and asperity friction.
Highlights
As the population increases the global demand for energy saving and emission reduction increases
To the decrease of hydrodynamic friction power loss by using low viscosity oil is Analysis partly or even fully neutralized by asperity friction power loss and the rough contact beAs shown in Figure 11, the hydraulic friction loss of lower viscosity oil is lower than tween two surfaces can lead to bearing wear, which changes the lubrication that of normal viscosity oil in each typical working condition and the decreasing amplitude and friction characteristics, and causes severe failure of other components
While the low viscosity oil is applied, the bearing capacity of oil film drops, the asperity friction power loss of typical working conditions is multiplied several times, even dozens of times high as when using normal viscosity oil, which may lead to the decrease of hydrodynamic friction power loss by using low viscosity oil is partly or even fully neutralized by asperity friction power loss and the rough contact between two surfaces can lead to bearing wear, which changes the lubrication and friction characteristics, and causes severe failure of other components
Summary
As the population increases the global demand for energy saving and emission reduction increases. The FEA simulation of internal combustion engine main bearing based on low viscosity consider the following aspects: oil needs to consider the following aspects: 2. A simulation method for the main bearings of ICE under the application scenario of low viscosity oil, with a multibody dynamicsmodel of crankshaft and multiple main bearings, considering the influence of asperity contact model and rough surface morphology characteristics must be established to evaluate the tribological characteristics of the ICE accurately. This work can be useful for the design of a new generation of high efficiency ICE and evaluation of the energy and economic benefits of the reduced friction losses from the use of ultra-low viscosity oil
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