Low-Ash Lubricating Composition for Piston Cleanliness
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Solution Overview
Problem
Automotive engines with direct-injection gasoline (DIG) technology face challenges in managing increased soot and ash levels, which degrade lubricant performance and shorten the lifespan of gasoline particulate filters (GPFs, due to the difficulty in formulating engine oils with reduced ash content while maintaining piston cleanliness and performance standards.
Innovation Solution
A detergent-free and low-ash lubricating composition comprising succinimide dispersants, ashless antiwear additives, and antioxidants, with specific elemental relationships, achieves effective piston cleanliness and performance without conventional detergent additives, meeting stringent ash limits and performance criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If detergent additives (calcium, magnesium, sodium, lithium salts) are used to clean piston surfaces, then piston cleanliness is improved, but ash content increases
Solution Approach 1:
The patent removes detergent additives (calcium, magnesium, sodium, lithium salts) from the lubricant formulation, extracting the harmful ash-producing components while retaining piston cleanliness through alternative ashless cleaning mechanisms
Solution Approach 2:
The invention changes the chemical composition parameters by eliminating metal salt detergents and using alternative ashless cleaning agents, transforming the lubricant from conventional high-ash formulation to low-ash (<0.2 wt%) composition that maintains cleaning effectiveness
2Object-generated harmful factors
If ash-contributing components are reduced to meet lower SASH limits, then ash content is reduced, but detergent performance degrades
Solution Approach 1:
The patent introduces ashless cleaning agents and alternative additives as intermediary substances that perform the cleaning function without requiring traditional metal salt detergents, enabling low-ash formulation to maintain detergent-like cleaning performance
Solution Approach 2:
The invention creates a composite additive package combining ashless antiwear additives, alternative cleaning agents, and lubricant base oils to achieve the synergistic effect of low ash content with maintained cleaning effectiveness
3Manufacturing precision
If conventional detergent additives are used to maintain piston cleanliness, then cleaning performance is maintained, but GPF lifespan is reduced due to ash accumulation
Solution Approach 1:
The patent converts the harmful ash accumulation problem into a benefit by using ashless cleaning mechanisms that prevent ash deposition on GPF, transforming the conventional approach (which causes GPF fouling) into an ash-free system that extends filter life
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 cleans pistons, achieving high merit ratings in engine tests, demonstrating improved engine cleanliness and performance even with minimal ash content, thus extending GPF lifespan and maintaining fuel efficiency.
Implementation Method 1
detergents function by acting as surface active agents that can remove deposits from the metal surfaces
Implementation Method 2
at least one of the succinimide dispersants is post treated with a boron compound
Implementation Method 3
one or more ashless antiwear additives
Implementation Method 4
one or more antioxidants
Data Source
AI summary
This disclosure describes detergent-free and low-ash lubricating composition achieving piston cleanliness with one or more succinimide dispersants, one or more ashless antiwear additives, and one or more antioxidants when selected ratios of sulfur, phosphorus, and nitrogen are maintained.