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Friction Reduction by Optimization of Local Oil Temperatures
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 09, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
The reduction of engine-out emissions and increase of the total efficiency is a fundamental approach to reduce the fuel consumption and thus emissions of vehicles driven by combustion engines. Conventional passenger cars are operated mainly in lower part loads for most of their lifetime. Under these conditions, oil temperatures are far below the maximum temperature allowed and dominate inside the journal bearings. Therefore, the objective of this research was to investigate possible potentials of friction reduction by optimizing the combustion engine’s thermal management of the oil circuit.
Within the engine investigations, it was shown that especially the friction of the main and connecting rod bearings could be reduced with an increase of the oil supply temperature. Furthermore, on a journal bearing test rig, it was shown that no excessive wear of the bearings is to be expected in case of load increase and simultaneous supply of cooler oil. In addition to the test investigations, MBS-(T)EHL simulation models were built up to investigate the behavior of the crankshaft bearings. Different driving profiles were simulated using GT-Suite to determine the achievable reduction of fuel consumption as well as the resulting reduction of CO2 emissions. It could be shown that a local increase of the oil temperature in the main and connecting rod bearings lead to significant friction advantages in the range of part load. These simulations show a reduction of CO2 emissions of at least 1.5 g/km by increasing the oil supply temperature from 85 to 140 °C.
|Technical Paper||Thermo-Hydraulic Oil Loop Modeling for I.C.E. Warm-Up Investigation|
|Technical Paper||Engine Friction Reduction for Improved Fuel Economy|
|Technical Paper||Prediction of Crank Pin Journal Temperature Based on the Oil Flow Rate|
CitationOezdemir, O., Huttinger, K., Bargende, M., and Rienäcker, A., "Friction Reduction by Optimization of Local Oil Temperatures," SAE Technical Paper 2019-24-0177, 2019, https://doi.org/10.4271/2019-24-0177.
Data Sets - Support Documents
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