Vehicle Canister Valve Negative Pressure Reduction
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Solution Overview
Problem
Existing canister valve devices for vehicles suffer from reduced opening performance due to negative pressure, which affects airtightness and noise reduction performance when operated in the opening direction.
Innovation Solution
A canister valve device with a shutoff valve and check valve system, where a diverging channel and check valve device distribute airflow to reduce negative pressure applied to the shutoff valve, improving opening performance while maintaining airtightness and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shutoff valve is operated in the opening direction under negative pressure, then the valve can open to allow airflow, but the opening performance is reduced by the negative pressure
Solution Approach 1:
The airflow path is segmented into multiple channels including a main passage and a diverging passage. The diverging passage branches off from the main passage at a specific position, creating separate flow paths that distribute the airflow and reduce the negative pressure concentration on the shutoff valve, thereby improving opening performance
Solution Approach 2:
A check valve is introduced as an intermediary component in the diverging passage. This check valve selectively controls airflow based on pressure conditions, allowing air to flow through the diverging passage when it helps reduce negative pressure on the shutoff valve during opening, while preventing reverse flow that would compromise airtightness during closing
2Reliability
If the valve is operated in the closing direction under negative pressure, then airtightness and noise reduction are improved, but opening performance deteriorates
Solution Approach 1:
The system dynamically adapts airflow paths based on valve operation state. During closing operation, negative pressure naturally closes the shutoff valve for reliable airtightness. During opening operation, the check valve dynamically opens to allow airflow through the diverging passage, reducing negative pressure and facilitating valve opening. The system transitions between different flow configurations based on operational needs
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 enhances the opening performance of the valve by distributing negative pressure, ensuring improved airtightness and noise reduction, thus improving the durability of the fuel system.
Implementation Method 1
the opening performance is reduced by the negative pressure
Implementation Method 2
air is distributed to the pipe and the diverging channel, whereby the negative pressure applied to the shutoff valve device is reduced by the flow of air
Data Source
AI summary
A canister valve device for a vehicle that is equipped with a shutoff valve device connected to a pipe providing a passage for air to flow to a canister and selectively opening and closing the passage of the pipe, may include a diverging channel diverging from the passage of the pipe to a position where the shutoff valve device is positioned to provide a passage for a portion of air flowing to the pipe; and a check valve device positioned in the diverging channel, closing when the shutoff valve device closes, and opening when the shutoff valve device opens so that air is distributed to the pipe and the diverging channel, whereby negative pressure applied to the shutoff valve device is configured to be reduced by flow of the air.