Engine Oil Screening via 3D Viscosity Mapping
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Solution Overview
Problem
Current methods for checking oils as lubricants for internal combustion engines are time-consuming and costly, requiring extensive testing on test rigs, which limits the evaluation of multiple oils and often leads to unsuitable oils being disqualified prematurely.
Innovation Solution
A method combining laboratory tests to determine a three-dimensional temperature/viscosity/shear rate characteristic diagram independently of an engine, followed by test rig experiments only when the diagram meets specific criteria, allowing for a preliminary selection of oils that satisfy both laboratory and engine-based criteria, thereby reducing the number of costly test rig experiments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive test rig experiments are conducted to check oil suitability, then reliability of lubricant selection is improved, but loss of time and manufacturing costs increase
Solution Approach 1:
The patent applies preliminary action by conducting laboratory tests (measuring viscosity at multiple temperatures and shear rates) before performing expensive test rig experiments. This preliminary characterization creates a three-dimensional temperature/viscosity/shear rate diagram that predicts oil suitability, allowing only promising candidates to proceed to full testing, thus reducing overall testing time while maintaining reliability
Solution Approach 2:
The patent replaces the mechanical test rig system with a laboratory-based measurement system that characterizes oil properties independently. By substituting direct engine testing with viscosity measurements at controlled temperatures and shear rates, the method reduces time and cost while maintaining assessment reliability through the comprehensive three-dimensional characterization
2Productivity
If multiple oils are evaluated through comprehensive testing, then productivity of lubricant selection is improved, but manufacturing costs increase
Solution Approach 1:
The patent enables evaluation of multiple oils by performing preliminary laboratory characterization on many candidates using relatively low-cost viscosity measurements. The three-dimensional temperature/viscosity/shear rate diagrams are generated for multiple oils in parallel, allowing high productivity in screening while controlling costs by limiting expensive test rig experiments to only the most promising candidates
Solution Approach 2:
The patent changes the assessment parameters from direct engine performance measurement to fundamental oil property measurement (viscosity at controlled temperatures and shear rates). This parameter transformation allows cost-effective evaluation of multiple oils by measuring basic properties that correlate with lubricant performance, enabling high productivity without proportional cost increases
3Measurement precision
If traditional test rig methods are used, then measurement precision of lubricant performance is improved, but loss of time increases
Solution Approach 1:
The patent achieves both precision and productivity by performing preliminary laboratory tests that provide precise viscosity characterization at multiple temperatures and shear rates. This preliminary precision assessment allows rapid identification of suitable oils without requiring all candidates to undergo lengthy test rig experiments, thus maintaining measurement precision while improving the overall speed of lubricant selection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient and cost-effective evaluation of multiple oils, identifying suitable lubricants that reduce internal friction and fuel consumption, while maintaining a low number of test rig experiments, thus saving time and resources.
Implementation Method 1
a three-dimensional temperature/viscosity/shear rate characteristic diagram which characterizes the oil is determined independently of an internal combustion engine
Data Source
AI summary
A method for checking an oil as a lubricant for an internal combustion engine includes: performing a laboratory test in which, independently of the internal combustion engine, a three-dimensional temperature-viscosity-shear rate characteristic field which characterizes the oil is determined, which includes a plurality of viscosities, shear rates and temperatures of the oil determined experimentally by the laboratory test and in each case associates shear rates and viscosities with the temperatures; checking whether the temperature-viscosity-shear rate characteristic field meets at least one predeterminable first criterion; and if the temperature-viscosity-shear rate characteristic field meets the first criterion: performing at least one test bench trial in which, via the internal combustion engine, it is checked whether the oil meets at least one predeterminable second criterion.