Spark Ignition Engine Oil Additive Package for Friction and Knock Control
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Solution Overview
Problem
In spark-ignition internal combustion engines, excessive reduction of piston ring tension leads to oil loss through the piston, causing lubricating oil to invade the combustion chamber, where it evaporates and concentrates metal additives, potentially deteriorating combustion and causing knocking, even when using low-viscosity lubricating oils.
Innovation Solution
A lubricating oil composition with a calcium salt of salicylate, sodium-based, magnesium-based, ash-free sulfur-based, and molybdenum-based additives, optimized to maintain a specific mass ratio and content, is used to maintain favorable combustion and detergency, even with reduced piston ring tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If piston ring tension is reduced to improve fuel consumption, then friction loss is reduced, but oil loss through piston increases
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricating oil by specifying precise ratios of calcium-based detergent (0.05-0.15 mass%), sodium-based additive (0.02-0.10 mass%), and magnesium-based additive (0.02-0.10 mass%). This parameter optimization allows the oil to maintain adequate viscosity and film strength at reduced piston ring tensions, preventing oil loss while enabling lower friction operation
Solution Approach 2:
The invention uses a composite additive package combining calcium-based detergent, sodium-based additive, and magnesium-based additive in specific ratios. This composite formulation creates synergistic effects where the combination of additives provides both friction reduction and oil retention properties that individual additives cannot achieve alone, resolving the contradiction between reduced tension and oil loss
2Loss of energy
If low-viscosity lubricating oil is used to improve fuel consumption, then flow resistance is reduced, but permeation amount in oil ring increases causing oil loss
Solution Approach 1:
The invention optimizes the chemical composition parameters of low-viscosity lubricating oil by controlling the content of calcium-based detergent (0.05-0.15 mass%), sodium-based additive (0.02-0.10 mass%), and magnesium-based additive (0.02-0.10 mass%). This parameter optimization enhances the oil's molecular structure and intermolecular forces, maintaining adequate film strength and reducing permeation through oil rings while preserving low viscosity for reduced flow resistance
3Reliability
If metal-based additive is concentrated in combustion chamber due to oil evaporation, then detergency is improved, but combustion state deteriorates causing knocking
Solution Approach 1:
The invention changes the concentration ratios of metal-based additives by specifying calcium-based detergent at 0.05-0.15 mass%, sodium-based additive at 0.02-0.10 mass%, and magnesium-based additive at 0.02-0.10 mass%. This optimized parameter distribution ensures that even when oil evaporates in the combustion chamber, the concentrated additives maintain favorable combustion characteristics while providing adequate detergency, preventing knocking
Solution Approach 2:
The invention uses the specific ratio of calcium-based, sodium-based, and magnesium-based additives as an intermediary system that mediates between detergency requirements and combustion quality. This additive combination acts as a buffer that provides protective films and cleaning action while simultaneously maintaining combustion stability, preventing the harmful effect of knocking
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 ensures favorable combustion and detergency while preventing oil loss through the piston, thereby reducing fuel consumption and preventing knocking in spark-ignition internal combustion engines.
Implementation Method 1
a lubricating oil composition including a base oil, (A) a calcium salt of salicylate, at least one selected from (B1) a sodium-based additive and (B2) a magnesium-based additive
Implementation Method 2
the friction loss is reduced by reducing a tension applied to the piston ring
Data Source
Figure 1
AI summary
Provided are a lubricating oil composition for internal combustion engine capable of preventing a deterioration of the combustion state of a spark-ignition internal combustion engine, specifically, a lubricating oil composition to be used for a spark-ignition internal combustion engine in which a total tension per piston of tensions applied to the piston ring is 100 N or less, the lubricating oil composition being a lubricating oil composition including a base oil, (A) a calcium-based detergent, at least one selected from (B1) a sodium-based additive and (B2) a magnesium-based additive, and (C) an ash-free sulfur-based additive in predetermined contents; a method for producing the lubricating oil composition; a spark-ignition internal combustion engine using the lubricating oil composition; and a method for lubricating the internal combustion engine.