Low Pressure EGR Trapping Device for Particle Separation
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Solution Overview
Problem
The low pressure EGR system for internal combustion engines allows foreign particles to enter the intake system, potentially causing malfunctions in the supercharger and engine, as existing filters cannot effectively remove large particles and are costly.
Innovation Solution
Incorporating a trapping device with a larger cross-sectional area positioned below the low pressure EGR passage to capture foreign particles by gravity, and using a valve controlled by an engine control unit to manage gas flow and prevent particle entry into the intake system, while maintaining a desired EGR gas supply level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter with catalysts is used in the low pressure EGR passage to remove carbon particles, then carbon particles are burnt in the filter, but relatively large particles cannot be removed and may clog small passages in the filter, and the filter is expensive
Solution Approach 1:
The invention divides the particle removal function into two separate devices: a trapping device for large particles and a filter with catalysts for carbon particles. This segmentation allows each device to be optimized for its specific function, preventing large particles from clogging the filter while maintaining effective carbon particle removal.
Solution Approach 2:
The trapping device acts as an intermediary component in the EGR passage that intercepts and removes large particles before they reach the filter with catalysts. This intermediary device protects the filter from clogging by large particles while allowing the filter to focus on removing carbon particles.
2Reliability
If a trapping device is added to the low pressure EGR passage to remove foreign particles, then foreign particles are trapped, but the device complexity increases
Solution Approach 1:
The trapping device is positioned to utilize gravity for particle separation, and the valve automatically closes when malfunctions are detected without requiring complex active control mechanisms. The system uses existing electronic control units and detectors to manage the valve, reducing the need for additional complex control systems.
Solution Approach 2:
The invention combines the trapping device with the existing EGR passage structure, integrating the particle removal function into the current system architecture rather than adding a completely separate system. The valve control integrates with the existing electronic control unit.
3Reliability
If the valve in the low pressure EGR passage is closed to prevent foreign particles from entering the intake passage, then foreign particle entry is prevented, but the total amount of EGR gas supplied to the engine decreases
Solution Approach 1:
The system dynamically adjusts the EGR gas flow by switching between the low pressure EGR passage (when functional) and the high pressure EGR passage (when the low pressure passage is closed due to malfunctions). This dynamic adjustment maintains the total EGR gas amount while protecting the intake system from foreign particles.
Solution Approach 2:
The system changes the operational parameters of the EGR system by switching between different passages based on the functional state of components. When the low pressure EGR passage is closed, the high pressure EGR passage is activated to maintain the required EGR gas quantity while preventing foreign particle contamination.
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
Effectively reduces the entry of foreign particles into the intake system, preventing engine and supercharger malfunctions and ensuring stable operation, with the added benefit of not increasing the number of components by using existing electronic control systems.
Implementation Method 1
a trapping device for trapping foreign particles contained in the exhaust gas... positioned lower than the low pressure EGR passage so that the foreign particles drop into the trapping device by their own weight
Data Source
AI summary
A low pressure EGR system includes a low pressure EGR passage connecting a downstream portion of an exhaust gas cleaner disposed in an exhaust passage to an upstream portion of a supercharger compressor disposed in an intake passage. A device for trapping foreign particles contained in EGR gas to be recirculated is disposed in the low pressure EGR passage. The trapping device may be positioned lower than the passage connected thereto so that foreign particles drop into the device by their own weight. A cross-sectional area of the trapping device may be made larger than that of the passage so that the flow speed of the EGR gas is reduced in the trapping device and the foreign particles are easily trapped. A valve for closing the low pressure EGR passage may be disposed therein to stop EGR when malfunctions are detected in the exhaust gas cleaner or the supercharger.