Engine Lubricant Composition to Prevent Cylinder Auto-Ignition
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Solution Overview
Problem
Existing lubricant oils in combustion engines degrade and enter the combustion chamber, leading to potential auto-ignition and damage due to their chemical alteration under high temperature and pressure conditions, which is not addressed by existing systems with low evaporation loss rates.
Innovation Solution
A lubricant oil composition comprising carbon molecules with varying molecular weights within a narrow range, maintaining a specific evaporation rate deviation to keep evaporated portions above their respective flammability limits under engine conditions, thereby reducing the probability of auto-ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If lubricant oil is designed with low evaporation loss rate, then oil loss is minimized, but the oil degrades and enters the combustion chamber causing potential auto-ignition and engine damage
Solution Approach 1:
The patent changes the molecular weight parameters of the lubricant oil components to resolve the contradiction. By specifying that the lubricant oil comprises a first component with molecular weight C20-C42 and a second component with molecular weight C30-C40, the oil maintains optimal evaporation characteristics while preventing degradation and auto-ignition in the combustion chamber, thereby ensuring engine reliability without excessive oil loss
Solution Approach 2:
The patent uses a composite lubricant oil formulation combining two specific components with different molecular weights. The first component (C20-C42) provides baseline lubrication with controlled evaporation, while the second component (C30-C40) supplements the formulation to prevent degradation and auto-ignition, achieving both low oil loss and high reliability through material composition
2Reliability
If lubricant oil is subjected to high temperature and pressure conditions in combustion chamber, then sealing function is maintained, but the oil chemically alters and causes harmful effects
Solution Approach 1:
The patent modifies the chemical composition parameters of the lubricant oil by specifying precise molecular weight ranges (C20-C42 for first component, C30-C40 for second component). This chemical parameter optimization enables the oil to maintain its sealing function under combustion chamber temperatures and pressures while resisting chemical alteration that would cause harmful effects
Solution Approach 2:
The patent accepts that some evaporation of lubricant oil is inevitable during combustion operation, but through careful molecular weight selection (C20-C42 and C30-C40 ranges), ensures that the evaporated portions do not cause auto-ignition or harmful chemical reactions, effectively managing the temporary presence of oil in the combustion chamber
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 lubricant oil composition effectively maintains evaporated components above their flammability limits, reducing the risk of auto-ignition and engine damage, thus extending the engine's lifespan and performance.
Implementation Method 1
the first component and the second component exhibit an evaporation rate deviation of approximately ten percent (10%) to maintain a first concentration of an evaporated portion of the first component greater than a first upper flammability limit of the first component when subjected to conditions within a combustion cylinder
Data Source
AI summary
A lubricant oil, the use of a lubricant oil as an additive, and a method of lubricating parts in an engine are described herein. The lubricant oil is characterized as having one or more components with each of the components having a minimum evaporation rate when experiencing conditions within a combustion cylinder of the engine. The minimum evaporation rate is configured so that when at least a portion of the lubricant oil evaporates in combustion cylinder and locally mixes with the air fuel mixture around it, the concentration of the combustible components in that mixture is greater than the net upper flammability limit of the particular components of the combustible mixture. Thus, in some examples, when the pressure and/or temperature of the combustion cylinder volume are increased, such as during a compression cycle, the probability of a portion of the lubricant oil combusting or auto-igniting is preferably decreased.