Lubricant Composition for Turbocharger Deposit Control
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Solution Overview
Problem
Existing lubricant compositions for diesel engines fail to adequately inhibit the formation of compressor deposits in turbochargers while maintaining good low-temperature characteristics, as the incorporation of high-boiling-point fractions to prevent deposit formation can adversely affect low-temperature engine oil viscosity and fuel efficiency.
Innovation Solution
A lubricant composition comprising at least 14% by weight of a fraction with a boiling point of 500°C to 550°C and at least 5% by weight of a fraction with a boiling point higher than 550°C, along with specific viscosity and evaporation characteristics, to effectively inhibit compressor deposit formation while ensuring good low-temperature performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large amount of high-boiling-point fraction is incorporated to inhibit compressor deposit formation, then deposit formation is reduced, but low-temperature characteristics deteriorate
Solution Approach 1:
The invention segments the base oil into specific boiling point fractions (500-550°C and higher than 550°C) to achieve targeted deposit inhibition while maintaining low-temperature performance. This segmentation allows precise control over which components contribute to deposit formation versus which maintain fluidity at low temperatures.
Solution Approach 2:
The invention changes the parameters of the base oil by specifying exact boiling point ranges (500-550°C and >550°C) and minimum content percentages (14% and 5% respectively). This parameter control ensures that the oil has sufficient high-boiling-point content to prevent deposits while maintaining appropriate low-temperature characteristics.
2Object-affected harmful factors
If the amount of light fraction is limited to suppress deposit formation, then deposit formation is reduced, but volatility control becomes difficult
Solution Approach 1:
The invention controls volatility by setting specific parameters for the base oil composition, particularly the distribution of fractions across different boiling point ranges. By defining minimum contents for specific high-boiling-point fractions, the invention inherently limits the relative amount of light fraction, thereby controlling volatility while addressing deposit formation.
3Use of energy by moving object
If engine size is reduced by increasing supercharging pressure, then fuel efficiency is improved, but compressor deposit formation increases
Solution Approach 1:
The invention changes the chemical composition parameters of the lubricant by specifying base oils with particular boiling point fraction distributions. This allows the lubricant to withstand the higher temperatures and pressures associated with increased supercharging, thereby enabling fuel efficiency improvements without suffering from accelerated deposit formation.
Solution Approach 2:
The invention uses a composite approach by combining multiple base oil components with specific boiling point characteristics (fractions in 500-550°C range and fractions above 550°C) to create a lubricant formulation that simultaneously handles high-temperature stability and deposit prevention, enabling the engine to operate at higher supercharging pressures.
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 composition significantly reduces compressor deposit formation and maintains low-temperature viscosity and fuel economy performance, improving turbocharger efficiency and fuel efficiency.
Implementation Method 1
the evaporation characteristics of an engine oil affects the deposit formation and the deposit formation can be suppressed by limiting the amount of light fraction in the oil
Data Source
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AI summary
The purpose of the present invention is to provide a lubricant composition in which performance of reducing the formation of compressor deposit is improved. The purpose of the present invention, in addition to the above effect, is also to ensure low temperature properties of the lubricant composition. This lubricant composition is characterized by comprising 14 mass% or more of a fraction having a boiling point of 500°C to 550°C and 5 mass% or more of a fraction having a boiling point of over 550°C.