Vehicle Canister Heat Accumulation for Temperature Stabilization
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Solution Overview
Problem
The vehicle canister's active carbon efficiency decreases due to abrupt temperature changes during absorption and desorption, leading to reduced absorption and emission efficiency over time.
Innovation Solution
Incorporating a heat accumulation material, such as sodium thiosulfate or sodium phosphate, in the canister's absorption and desorption improver that can phase change with temperature, to stabilize temperature fluctuations and enhance active carbon's absorption and desorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If active carbon is used to absorb evaporating gas, then absorption capacity is improved, but temperature increases causing reduced absorption efficiency
Solution Approach 1:
The patent utilizes the phase transition (melting/freezing) of water as a heat accumulation material. When active carbon absorbs evaporating gas, the exothermic reaction increases temperature, causing the water to melt and absorb excess heat. During desorption, the freezing process releases heat, preventing temperature from dropping too low. This phase transition mechanism effectively buffers temperature fluctuations, maintaining optimal absorption efficiency.
Solution Approach 2:
The patent introduces water as an intermediary heat accumulation material between the evaporating gas and the active carbon. This intermediary absorbs and releases heat during phase transitions, mediating the thermal interaction between the absorbing/desorbing processes and the active carbon, thereby preventing temperature extremes that would reduce absorption efficiency.
2Speed
If active carbon absorbs evaporating gas rapidly, then absorption speed is improved, but temperature increases causing reduced absorption efficiency
Solution Approach 1:
The rapid absorption process generates heat that is quickly absorbed by the water through phase transition (melting). This allows the absorption speed to remain high while the temperature increase is buffered, preventing the reduction in absorption efficiency that would otherwise occur due to excessive heat.
3Speed
If active carbon releases absorbed gas rapidly, then emission speed is improved, but temperature decreases causing reduced emission efficiency
Solution Approach 1:
During rapid desorption, the temperature drop is buffered by the freezing process of the water heat accumulation material, which releases latent heat. This maintains the temperature within an optimal range for emission efficiency while allowing rapid gas release to occur.
4Reliability
If heat accumulation material is added to stabilize temperature, then absorption and emission efficiency is improved, but device complexity increases
Solution Approach 1:
The water heat accumulation material is contained within the porous structure of the active carbon itself, utilizing the existing material structure to provide thermal buffering. This self-service approach integrates the temperature stabilization function into the existing canister design without requiring separate heating or cooling systems, thereby minimizing the increase in device complexity.
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 solution effectively prevents rapid temperature changes, maintaining high absorption and desorption efficiency of active carbon over extended use, improving the canister's performance by stabilizing temperature and enhancing hydrocarbon collection and release.
Implementation Method 1
the heat accumulate material is able to phase change in accordance with the temperature change at the time of the active carbon is absorption and desorption
Implementation Method 2
the active carbon absorbs the evaporating gas, that causes abrupt exothermic reaction, and the temperature of the active carbon is elevated
Implementation Method 3
the active carbon filled in the canister secedes the evaporating gas, the temperature of the active carbon is lowered
Data Source
AI summary
The vehicle canister comprising: the first chamber filled with the active carbon and funneled with the tank port, where the evaporating gas is infused through and the second chamber filled with the active carbon and funneled with the atmosphere port and neighboring the first chamber via the isolation wall. Also, it involves the vehicle canister installed in the canister housing which has the absorption and desorption improver to improve the absorption and desorption efficiency with heat conduction with temperature change of the active carbon occurred during the absorption and desorption of evaporation gas infused into the canister housing. The absorption and desorption improver is composed with the first and the second absorption and desorption improver.