Friction Modifier Mixture for Engine Fuel Efficiency
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Solution Overview
Problem
Current engine lubricants face challenges in simultaneously achieving improved fuel economy, reduced friction, and maintaining deposit control, especially at high temperatures, due to the detrimental effects of organic friction modifiers which can lead to increased wear and deposit formation.
Innovation Solution
A lubricating oil composition comprising 50-99% base stock and a friction modifier mixture of ethoxylated fatty acid ester and glycerol fatty acid ester in a weight ratio of 0.1:1 to 1:0.1, present in 0.1-1.5% by weight, which improves fuel efficiency and friction reduction while maintaining or improving deposit control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic friction modifiers are added to reduce surface friction and improve fuel economy, then fuel efficiency is improved, but deposit formation increases and oxidative stability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the friction modifier by using specific ratios of glycerol esters (0.03-1.0 wt%) combined with ethoxylated fatty acid esters (0.03-1.5 wt%), where the ethoxylated component has controlled molecular weight (200-2000) and ethoxylation degree (1-10). This parameter optimization allows achieving friction reduction while controlling deposit formation through precise compositional control.
Solution Approach 2:
The patent employs a composite friction modifier system combining multiple components: glycerol esters (mono-, di-, and tri-esters), ethoxylated fatty acid esters, and specific ratio control (0.1:1 to 1:0.1 weight ratio). This composite approach leverages the complementary properties of each component to achieve both friction reduction and deposit control that single additives cannot provide alone.
2Use of energy by moving object
If organic friction modifiers are added to reduce surface friction, then fuel economy improves, but anti-wear film formation is compromised due to competition for surface sites
Solution Approach 1:
The patent segments the friction modification function across multiple additive components rather than relying on a single additive. The glycerol esters provide one mechanism for friction reduction while ethoxylated fatty acid esters provide another, allowing the system to achieve friction benefits without sacrificing anti-wear protection from other lubricant components.
Solution Approach 2:
The patent optimizes the concentration parameters of friction modifiers to very low levels (0.03-1.5 wt% total), which reduces their competition for surface sites while maintaining sufficient friction reduction effect. This low-dose approach allows anti-wear additives to dominate surface film formation while friction modifiers provide secondary benefits.
3Use of energy by moving object
If viscosity of lubricating oil is decreased to increase fuel economy, then fuel efficiency improves, but lubrication film strength deteriorates
Solution Approach 1:
The friction modifier mixture acts as an intermediary substance that enhances the lubrication mechanism at the contact interface. By providing low-friction boundary lubrication through chemical adsorption and surface film formation, it compensates for the reduced hydrodynamic lubrication strength resulting from lower bulk oil viscosity.
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 lubricating oil composition achieves significant improvements in fuel economy and friction reduction without compromising engine cleanliness, as demonstrated by Sequence VID engine tests, with a fuel efficiency improvement of over 10% and effective deposit control.
Implementation Method 1
adding organic or organic metallic friction modifiers reduces the surface friction of the lubricating oil
Data Source
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AI summary
A method for improving fuel efficiency and reducing frictional properties while maintaining or improving deposit control, in an engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition including a lubricating oil base stock as a major component, and a friction modifier mixture as a minor component. Fuel efficiency and frictional properties are improved and deposit control is maintained or improved as compared to frictional properties and deposit control achieved using a lubricating engine oil containing a minor component other than the friction modifier mixture. A lubricating engine oil having a composition including a lubricating oil base stock as a major component, and a friction modifier mixture as a minor component. The lubricating engine oils are useful in internal combustion engines including direct injection, gasoline and diesel engines.