Engine Oil Composition for Low-Viscosity Friction Control
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Solution Overview
Problem
Lubricating oil compositions struggle to reduce friction coefficient effectively in a wide temperature range, including low temperature ranges, while maintaining decreased viscosity and securing a prescribed initial base number, especially in vehicles with hybrid or start-stop systems.
Innovation Solution
A lubricating oil composition comprising a base oil, a metal-based detergent containing calcium and magnesium detergents, an ash-free friction modifier, and a molybdenum compound, with specific content ratios and ranges to achieve reduced friction and viscosity across varying temperatures, and maintain initial base number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a molybdenum compound is blended as a friction modifier, then the friction coefficient is reduced in a high temperature range, but the friction coefficient cannot be reduced effectively in a low temperature range
Solution Approach 1:
The patent combines a molybdenum compound (effective at high temperatures) with an ash-free friction modifier (effective at low temperatures) into a single lubricating oil composition. This merging of two different friction modifier types allows the composition to reduce friction coefficients effectively across both low and high temperature ranges, resolving the temperature range adaptability limitation of using only a molybdenum compound
Solution Approach 2:
The invention creates a composite friction modifier system by blending a molybdenum compound with an ash-free friction modifier in specific proportions. This composite approach leverages the complementary temperature-dependent friction reduction properties of each component, enabling effective friction reduction across a wide temperature spectrum from low to high temperatures
2Use of energy by moving object
If the viscosity of the lubricating oil composition is decreased to improve fuel consumption efficiency, then fuel efficiency is improved, but the composition readily transfers to the boundary lubrication region causing wear
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricating oil by incorporating specific friction modifiers (molybdenum compound and ash-free friction modifier) in optimized proportions. This parameter change allows the oil to maintain lower viscosity for improved fuel efficiency while the friction modifiers compensate for the reduced viscosity by providing enhanced boundary lubrication protection, preventing excessive wear
3Force
If friction reduction additives are blended to reduce friction coefficient, then friction is reduced, but the initial base number cannot be secured
Solution Approach 1:
The patent employs an ash-free friction modifier that does not consume the base oil's alkaline reserves during friction reduction. This allows sustained friction protection without depleting the initial base number, effectively using a friction modifier that provides continuous protection without the sacrificial consumption characteristic of traditional detergent-based approaches
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
The composition effectively reduces friction coefficient in a wide temperature range, including low temperatures, while maintaining low viscosity and securing a prescribed initial base number, enhancing fuel efficiency and wear resistance.
Implementation Method 1
a lubricating oil composition that can secure the prescribed initial base number while reducing the friction coefficient in a wide temperature range including a low temperature range
Implementation Method 2
methods for reducing the friction coefficient by blending a friction modifier to a lubricating oil composition
Data Source
AI summary
An object is to provide a lubricating oil composition that can secure the prescribed initial base number while reducing the friction coefficient in a wide temperature range including a low temperature range, and has a decreased viscosity. The object is achieved by a lubricating oil composition used in a gasoline engine, containing a base oil (A), a particular metal-based detergent (B), and a particular molybdenum compound (D), the lubricating oil composition having a content of molybdenum atoms derived from the molybdenum compound (D) of 0.05% by mass or more, a base number of 4.0 mgKOH/g or more, and an HTHS viscosity at 150°C of 1.3 mPa ·s or more and less than 2.3 mPa ·s.