Evaporation Fuel Processing Device Adsorbent Layer Segmentation
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Solution Overview
Problem
Conventional evaporation fuel processing devices experience degraded desorption performance due to low gas temperatures in adsorbent layers, leading to insufficient fuel component desorption and increased blow-by to the atmosphere.
Innovation Solution
The device features a configuration with three or more adsorbent layers and separating parts, where the total volume of the adsorbent layers is set smaller than the total volume of the separating parts, with longer separation distances and larger volumes in the separating parts closer to the atmospheric air port, maintaining higher gas temperatures and improving desorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the volume of adsorbent layers is reduced to minimize blow-by, then the residual amount of fuel components decreases, but the desorption performance degrades due to insufficient temperature recovery in small spaces
Solution Approach 1:
The passage is divided into multiple adsorbent layers (first, second, third, and fourth adsorbent layers) with partition plates between them, creating segmented zones that allow different volume configurations in different regions while maintaining overall desorption performance
Solution Approach 2:
The invention applies different volume characteristics to different regions: the fourth adsorbent layer near the atmospheric air port has a smaller volume to reduce blow-by, while the first adsorbent layer near the tank port has a larger volume to ensure sufficient desorption performance and temperature recovery
2Reliability
If the volume of separating parts is increased to maintain gas temperature, then the residence time increases and desorption performance improves, but the total device volume increases
Solution Approach 1:
The partition plates are positioned to create larger free space volumes near the tank port where temperature recovery is most critical, while maintaining compact dimensions near the atmospheric air port where the primary goal is blow-by reduction
Solution Approach 2:
The invention optimizes the balance between adsorbent layer volumes and free space volumes dynamically along the flow path, adjusting the ratio of adsorbent to free space in each region to match the local requirements for temperature recovery versus compactness
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
This configuration enhances desorption performance by maintaining higher gas temperatures and reducing residual fuel components, thereby minimizing blow-by to the atmosphere and improving blow-by reduction performance.
Implementation Method 1
adsorbent layers filled with adsorbent which can adsorb evaporation fuel components
Implementation Method 2
when gas temperature decreases due to desorption of fuel components from the activated carbon in the fourth adsorbent layer 114 or the third adsorbent layer 113
Data Source
AI summary
The present invention provides an evaporation fuel processing device including: a passage formed inside so as to allow a fluid to flow through the passage; a tank port and a purge port formed on one end side of the passage; an atmospheric air port formed on the other end side of the passage; and adsorbent layers filled with adsorbent which can adsorb evaporation fuel components, the adsorbent layers being provided in the passage, wherein a region which is constituted of three or more adsorbent layers and separating parts for separating the adjacent adsorbent layers, and in which a total volume of the adsorbent layers is set smaller than a total volume of the separating parts, is provided on an atmospheric air port side of the passage.