Bio-Based Engine Oil Composition for Low-Ash Oxidation Stability
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Solution Overview
Problem
Conventional engine lubricants contain sulfur, phosphorus, and ash that adversely affect engine post-treatment devices and catalysts, leading to increased engine back pressure and poorer fuel economy, and suffer from oxidation at high temperatures.
Innovation Solution
Lubricant compositions comprising low-sulfur, low-ash, and low-phosphorus components, including bio-sourced base stocks and alkyl naphthalene, with optional metal detergents, ashless antiwear additives, and antioxidants, to enhance oxidation stability and minimize device degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-containing and sulfur-containing compounds are used as antiwear additives, then antiwear performance is improved, but harmful effects on post-treatment devices and catalysts increase
Solution Approach 1:
The patent removes phosphorus-containing and sulfur-containing compounds from the lubricant composition to eliminate their harmful effects on post-treatment devices and catalysts. This extraction of harmful substances resolves the contradiction by sacrificing some antiwear performance to protect the environment and engine components.
Solution Approach 2:
The patent changes the chemical composition parameters by using alternative antiwear additives that do not contain phosphorus or sulfur, thereby maintaining protective functions while eliminating harmful emissions and device degradation.
2Reliability
If conventional antiwear additives and detergents are used, then lubrication and cleaning functions are improved, but ash residue formation increases
Solution Approach 1:
The patent extracts and removes ash-forming components from the lubricant composition, specifically eliminating conventional detergents and antiwear additives that produce ash residue. This allows the lubricant to maintain its functional properties while significantly reducing harmful ash accumulation in the engine.
Solution Approach 2:
The patent replaces harmful ash-forming additives with alternative compounds that provide similar lubrication and cleaning functions without producing ash residue, effectively converting a harmful byproduct into a beneficial or neutral outcome.
3Reliability
If conventional lubricants are used at high temperatures, then lubrication is provided, but oxidation of the lubricant occurs
Solution Approach 1:
The patent changes the chemical composition of the base stock to include oxidation-resistant components that maintain lubrication properties at high temperatures without undergoing oxidation degradation.
Solution Approach 2:
The patent creates a composite lubricant composition combining oxidation-stable base stocks with specially selected additives that work synergistically to provide both lubrication and oxidation resistance at elevated temperatures.
Data Source
AI summary
A lubricant composition may be used as an engine oil. Such lubricant compositions may, for example, include: from about 25.0 mass % to about 99.8 mass % of an oil base stock, based on a total mass of the lubricant composition, the oil base stock including at least one bio-sourced basestock and at least one alkyl naphthalene; and wherein the lubricant composition includes about 0.05 mass % or less phosphorus, about 0.05 mass % or less sulfur, and about 0.5 mass % or less ash.