Ashless Lubricant Composition for Engine Antiwear and Corrosion Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lubricating compositions for internal combustion engines face challenges in balancing antiwear performance, friction modification, and corrosion inhibition while minimizing the detrimental effects of phosphorus and sulfur-containing additives, which can impact fuel economy and catalyst performance.
Innovation Solution
A lubricating composition comprising an oil of lubricating viscosity, a nitrile compound, and a derivative of a hydroxy-carboxylic acid, such as tartaric acid, which provides antiwear performance, friction modification, and corrosion inhibition, particularly for copper and lead, while reducing the need for phosphorus and sulfur-containing additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphorus-containing antiwear agents such as ZDDP are used to protect engine components from wear, then antiwear performance is improved, but fuel economy deteriorates and copper corrosion increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing phosphorus-containing ZDDP with a combination of ashless friction modifiers (esters of polyhydric alcohols or hydroxyl-containing acids) and corrosion inhibitors, thereby improving fuel economy while maintaining antiwear performance through alternative protective mechanisms
Solution Approach 2:
The patent introduces corrosion inhibitors as intermediary substances that specifically protect copper components from corrosion caused by ashless friction modifiers, allowing the use of fuel-efficient ashless additives while preventing their detrimental effect on copper corrosion
2Reliability
If phosphorus-containing antiwear agents such as ZDDP are used to protect engine components from wear, then antiwear performance is improved, but copper corrosion increases
Solution Approach 1:
The patent changes the chemical composition by replacing phosphorus-containing ZDDP with ashless friction modifiers combined with specific corrosion inhibitors, thereby eliminating phosphorus-induced copper corrosion while maintaining protective functions through alternative mechanisms
Solution Approach 2:
The patent introduces corrosion inhibitors as intermediary substances that specifically target and protect copper components from corrosion, allowing the use of ashless friction modifiers without their detrimental effect on copper-based engine components
3Loss of energy
If ashless additives such as esters of polyhydric alcohols or hydroxyl containing acids are used to reduce phosphorus content, then fuel economy is improved, but copper and lead corrosion increases
Solution Approach 1:
The patent introduces corrosion inhibitors as intermediary substances that specifically protect copper and lead components from corrosion caused by ashless friction modifiers, enabling the use of fuel-efficient additives while preventing their harmful effects on metal components
Solution Approach 2:
The patent extracts and addresses the specific harmful effect of ashless additives on copper and lead corrosion by adding targeted corrosion inhibitors, separating the fuel economy benefit from the corrosion problem
4Object-generated harmful factors
If sulfur and phosphorus-containing additives are reduced to meet emission control requirements, then catalyst performance is improved, but antiwear performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by reducing sulfur and phosphorus content while compensating for lost antiwear performance through optimized combinations of ashless friction modifiers and corrosion inhibitors, thereby meeting emission requirements without sacrificing engine protection
Solution Approach 2:
The patent creates a multi-functional additive package where ashless friction modifiers provide both friction reduction and partial antiwear protection, while corrosion inhibitors provide additional protective functions, collectively replacing the multiple functions previously provided by phosphorus-containing additives
Data Source
AI summary
The invention provides a lubricating composition containing an oil of lubricating viscosity, a compound derived from the hydroxy-carboxylic acid and a nitrile compound. The invention further relates to a method of the lubricating an internal combustion engine with the lubricating composition.