Variable Air Intake Valve Noise Reduction via Buffering
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Solution Overview
Problem
Variable air intake systems generate a noticeable hitting sound when the valve rapidly closes and hits the duct body during a sudden decrease in engine output, such as during sudden braking, due to the magnetic force increasing the impact between the valve and the duct body.
Innovation Solution
A noise-reducing variable air intake apparatus is designed with a buffering member made of ethylene propylene diene monomer (EPDM) rubber, mounted on either the valve or duct body, to absorb the sound when the valve closes, and a magnet and steel member configuration that maintains the valve's closed position while minimizing the impact force by directing the magnetic force differently from the closure direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnet and steel member are used to maintain valve closure, then the valve remains securely closed at low RPM, but the magnetic force increases the impact force when the valve rapidly closes, generating louder hitting sound
Solution Approach 1:
A buffering member made of elastomeric material (e.g., rubber) is attached to either the valve or duct body at the closure location. This buffering member is positioned in advance to absorb and cushion the impact when the valve rapidly closes during sudden engine output changes, preventing the valve from directly hitting the duct body and reducing the generated noise.
Solution Approach 2:
The buffering member acts as an intermediary element between the valve and duct body at the closure interface. Instead of the valve directly contacting the duct body, the buffering member mediates the interaction, absorbing impact energy and reducing the transmission of impact forces that generate hitting sounds.
2Speed
If the valve closes rapidly during sudden engine output reduction, then the valve responds quickly to changing conditions, but the rapid closure causes the valve to hit the duct body, generating noticeable noise
Solution Approach 1:
The buffering member is pre-installed at the valve closure location to cushion the rapid impact. When the valve closes quickly during sudden engine output changes, the buffering member absorbs the impact energy, allowing fast response while preventing direct hitting and noise generation.
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 apparatus effectively reduces noise by preventing the generation of a hitting sound during rapid engine output changes, maintaining the magnetic force for valve closure while minimizing wear and maintaining effectiveness over time.
Implementation Method 1
a magnet mounted on either the valve or the duct body; and a steel member mounted on the one of the valve and the duct body to which the magnet is not mounted
Implementation Method 2
a buffering member mounted on either the valve or the duct body to prevent generation of hitting sound when the valve rapidly closes and hits the duct body
Data Source
AI summary
A variable air intake apparatus in accordance with the present invention includes an valve configured to open a through hole formed at a duct body when an engine is driven at a high output to change a path of air introduced into the engine depending on an engine RPM, in which a magnet is mounted on any one of the valve and the duct body and a steel member is mounted on the other one thereof to maintain a state in which the valve closes the through hole, and a buffering member is mounted on any one of the valve and the duct body to prevent generation of hitting sound that is generated when the valve hits the duct body.