Lubricating Composition for Heavy-Duty Diesel Engine Deposit Control
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Solution Overview
Problem
Heavy-duty diesel engines face challenges in reducing soot, deposit formation, and wear while maintaining cleanliness, particularly due to the limitations of alkylphenol-based detergents which are under scrutiny for endocrine disruption and require a lubricating composition that operates effectively under severe conditions.
Innovation Solution
A lubricating composition for compression-ignition internal combustion engines comprising an oil of lubricating viscosity, 1.5 wt % to 10 wt % ashless dispersant, a 300 TBN or higher alkaline earth metal sulphonate detergent, a 80 TBN or lower alkaline earth metal sulphonate detergent, and a phosphorus-containing antiwear agent, with a sulphated ash content of not more than 1.5 wt %, and minimal or no phenolic-based detergent, optimized for heavy-duty applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkylphenol-based detergents are used to provide deposit control and antioxidancy, then cleaning effectiveness is improved, but environmental safety deteriorates due to endocrine disruption concerns
Solution Approach 1:
The patent removes phenolic-based detergents from the lubricating composition entirely, extracting the harmful substance while maintaining cleaning functionality through alternative detergent systems (calcium sulphonate and magnesium sulphonate detergents) that do not cause endocrine disruption
Solution Approach 2:
The patent changes the chemical composition parameters by specifying TBN ranges (300 TBN or higher alkaline earth metal sulphonate detergent, 80 TBN or lower alkaline earth metal sulphonate detergent) and metal ratios (10 to 40, 1 to 5) to achieve effective deposit control without phenolic compounds
2Reliability
If high TBN alkaline earth metal sulphonate detergents are used to reduce soot and deposits, then cleanliness is improved, but ash content increases
Solution Approach 1:
The patent precisely controls the TBN parameter range (300 TBN or higher and 80 TBN or lower), metal ratio (10 to 40), and soap content (0.4 wt% to 1.5 wt%) to balance cleanliness performance with ash content limitations (not more than 1.5 wt%), achieving optimal performance without excessive ash formation
Solution Approach 2:
The patent uses a composite detergent system combining calcium sulphonate and magnesium sulphonate detergents in specific ratios (80:20 to 20:80) to achieve synergistic effects that improve cleanliness while controlling overall ash content through the complementary properties of different metal detergents
3Reliability
If phenolic based detergent is included to enhance deposit control, then cleaning performance is improved, but environmental compliance deteriorates
Solution Approach 1:
The patent completely removes phenolic-based detergents from the composition to ensure environmental compliance, replacing their deposit control function with alternative detergent systems that meet environmental regulations while maintaining cleaning effectiveness
Data Source
AI summary
The invention provides a method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising: an oil of lubricating viscosity, 1.5 wt % to 10 wt % of an ashless dispersant, a 300 TBN or higher alkaline earth metal sulphonate detergent having a metal ratio of 10 to 40, and a 80 TBN or lower alkaline earth metal sulphonate detergent having a metal ratio of 1 to 5, wherein the lubricating composition comprises 0 wt % to 0.2 wt % of a phenolic based detergent, the ratio of higher alkaline earth metal sulphonate detergent to lower alkaline earth metal sulphonate detergent is 80:20 to 20:80, the total amount of soap delivered by the calcium sulphonate detergents is 0.4 wt % to 1.5 wt % of the lubricating composition, and the lubricating composition has a sulphated ash content of not more than 1.5 wt %.