Dual Ceramic Oil Filter for Engine Soot Removal
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Solution Overview
Problem
Conventional oil filters for internal combustion engines are ineffective in reliably removing small foreign matter such as soot ingredients and sludge, leading to oil deterioration and engine damage, due to variations in pore size and temperature effects.
Innovation Solution
A dual-filter system comprising a first oil filter with a larger pore size and a second oil filter made of ceramic material with a smaller mean pore size, specifically between 0.1 μm and 0.5 μm, to effectively remove small foreign matter while allowing additive ingredients to pass through, maintaining oil performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional oil filter with filter paper is used, then the structure is simple and easy to manufacture, but it cannot reliably remove small foreign matter such as soot ingredients and sludge
Solution Approach 1:
The patent divides the filtration system into two separate filters: a first oil filter with larger pores for general filtration and a second oil filter with smaller pores specifically for removing soot and sludge. This segmentation allows each filter to be optimized for its specific function, improving overall filtration reliability without requiring a single complex multi-functional filter structure.
Solution Approach 2:
The patent applies different pore sizes to different filters within the system. The first oil filter has larger pores suitable for general contamination, while the second oil filter has smaller pores (0.1-0.5 μm) specifically designed for soot and sludge removal. This local differentiation of filtration characteristics enables reliable removal of small foreign matter while maintaining manufacturing simplicity.
2Reliability
If the pore size of the filter is reduced to remove small foreign matter, then filtration effectiveness improves, but the filter becomes more sensitive to temperature changes and pore size variation
Solution Approach 1:
By separating the filtration function into two independent filters with different pore sizes, the patent allows the second filter to operate at a stable, controlled pore size (0.1-0.5 μm) without being overly sensitive to temperature variations. The first filter handles general filtration while the second filter provides stable, fine filtration for soot and sludge, maintaining pore size stability through proper material selection and design.
3Reliability
If a single filter with small pore size is used, then small foreign matter can be removed, but the filter may clog easily and reduce oil flow
Solution Approach 1:
The patent segments the filtration load between two filters: the first oil filter handles the bulk of general contamination with larger pores, while the second oil filter with smaller pores (0.1-0.5 μm) specifically targets soot and sludge. This division prevents the fine filtration filter from being overwhelmed by large particles, reducing clogging risk and maintaining oil flow rate while preserving fine filtration capability.
Solution Approach 2:
The first oil filter performs preliminary filtration of larger particles and contaminants before the oil reaches the second filter. This preliminary action protects the second filter with its small pores from immediate clogging by large foreign matter, allowing it to maintain its fine filtration function and sustain oil flow over extended periods.
4Ease of manufacture
If conventional filter materials are used, then manufacturing is easy, but pore size varies significantly due to heat expansion and material properties
Solution Approach 1:
The patent specifies different material characteristics for different filters: the first oil filter uses conventional filter paper with larger pores for general filtration, while the second oil filter uses materials with controlled pore sizes (0.1-0.5 μm) specifically for soot and sludge removal. This local quality differentiation allows each filter to be manufactured with appropriate precision for its function, balancing ease of manufacture with pore size control.
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 dual-filter system reliably removes small foreign matter without affecting temperature, maintains oil performance by passing viscosity index improvers, and exhibits high durability even with advanced oil deterioration, ensuring effective filtration and engine reliability.
Implementation Method 1
the second filter member is made of a ceramic material and has a mean pore size smaller than the mean pore size of the first filter member
Data Source
AI summary
An oil deterioration suppressing apparatus for an internal combustion engine comprises a first oil filter and a second oil filter, wherein the first oil filter comprises a first filter member for filtering oil from an oil pan in which oil is stored, and the second oil filter comprises a second filter member for filtering oil from the oil pan, and wherein the second filter member is made of a ceramic material and has a mean pore size smaller than the mean pore size of the first filter member.