Internal Combustion Intake Noise Amplifier with Segmented Resonance
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Solution Overview
Problem
Existing intake noise amplifying systems for internal combustion engines struggle to amplify intake noise across a wide frequency range, particularly from low to high frequencies, to provide effective feedback to vehicle drivers.
Innovation Solution
An intake noise amplifying system with a vibration body sandwiched between a grid plate and a bore plate, where the grid plate divides the vibration body into partitioned parts and the bore plate has smaller bores, allowing for resonance across different frequency ranges by adjusting the areas and hardness of the partitioned parts and bores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single resonance chamber is used to amplify intake noise, then the structure is simple, but the frequency range for amplification is limited
Solution Approach 1:
The resonance chamber is divided into multiple partitioned parts by a grid plate, with each partition having different volumes and resonance characteristics. This segmentation allows the system to amplify intake noise across a broader frequency range while maintaining a relatively simple overall structure.
Solution Approach 2:
Different partitions of the vibration body have different local properties (different volumes, shapes, and positions) that enable them to resonate at different frequencies. The grid plate creates localized resonance chambers with specific acoustic characteristics tailored for different frequency ranges.
2Strength
If the vibration body is made rigid to maintain structural integrity, then strength is improved, but resonance capability across different frequencies is reduced
Solution Approach 1:
The vibration body is designed as a thin-walled hollow structure that can flex and deform elastically in response to intake pulse pressure. This flexibility enables the vibration body to resonate at multiple frequencies while maintaining sufficient structural strength through its geometric design and material selection.
Solution Approach 2:
The vibration body is designed to dynamically respond to varying intake pulse frequencies by deforming in different modes. The structure transitions from a static rigid component to a dynamic element that adapts its vibration characteristics based on the frequency of the incoming intake noise.
3Adaptability or versatility
If the vibration body is made soft to enhance resonance, then resonance capability is improved, but structural strength and durability are reduced
Solution Approach 1:
The vibration body utilizes a thin-walled hollow structure made from materials with appropriate elastic properties. This design provides sufficient flexibility for resonance while maintaining structural integrity through the hollow geometry that distributes stress and prevents catastrophic failure.
Solution Approach 2:
The vibration body may be constructed from composite materials or treated materials that combine flexibility for resonance with enhanced durability. The material selection balances elastic deformation capabilities with resistance to fatigue, corrosion, and thermal degradation.
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 system efficiently amplifies intake noise across a broader frequency range, from low to high frequencies, by resonating with the intake pulse, enhancing the feedback experience for vehicle drivers.
Implementation Method 1
A part of the vibration body divided by the grid plate resonates with the intake pulse within a low frequency range where the frequency is comparatively low to amplify the intake noise within the low frequency range. On the other hand, a part of the vibration body located in the bore resonates with the intake pulse within a high frequency range where the frequency is comparatively high to amplify the intake noise within the high frequency range.
Data Source
AI summary
An intake noise amplifying system of an internal combustion engine of a vehicle is provided to a branch pipe branching from an intake passage of the engine and transmitting intake noise into a cabin of the vehicle. The system includes a plate-shaped vibration body which vibrates by intake pulse from the intake passage, a first case disposed in the branch pipe on an intake passage side of the vibration body, and a second case disposed in the branch pipe on a cabin side of the vibration body. The vibration body is sandwiched between the first and second cases. One of the first and second cases includes a grid plate having a grid dividing the vibration body into partitioned parts, and the other includes a bore plate having bores each having an area smaller than a minimum area of the partitioned parts.