Engine Intake Noise Amplification With Grid-Bore Resonance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing intake noise amplifying systems for internal combustion engines are limited in expanding the frequency range of amplified intake noise, particularly from low to high frequencies, which affects the feedback and sporty feel for 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 resonance across a wide frequency range from low to high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single case structure is used for the vibration body, then the device complexity is reduced, but the frequency range for amplifying intake noise is limited
Solution Approach 1:
The case is divided into two separate cases: a first case with a grid plate for low-frequency resonance and a second case with a bore plate for high-frequency resonance. This segmentation allows each case to be optimized for specific frequency ranges, expanding the overall amplification frequency range while maintaining manageable complexity through modular design
Solution Approach 2:
Different regions of the vibration body are assigned different functions by placing the grid plate in the first case for low-frequency response and the bore plate in the second case for high-frequency response. This local differentiation of quality allows the same vibration body to resonate effectively across a broad frequency spectrum
2Adaptability or versatility
If the vibration body is divided into many partitioned parts, then the low frequency amplification is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The grid plate divides the vibration body into multiple partitioned parts, each capable of resonating at low frequencies. This segmentation increases the surface area and creates multiple resonance paths for low-frequency sounds, improving amplification effectiveness while the regular grid pattern simplifies manufacturing compared to irregular complex shapes
3Adaptability or versatility
If smaller bores are used in the bore plate, then the high frequency amplification is improved, but the number of bores must increase
Solution Approach 1:
The bore plate contains multiple small bores distributed across its surface. Each small bore acts as an independent resonance chamber for high-frequency sounds. While the number of bores increases, they can be arranged in regular patterns and manufactured using standardized processes, making the increased complexity manageable and beneficial for achieving broad high-frequency amplification
Solution Approach 2:
The bore plate with multiple small bores creates a porous-like structure that allows high-frequency sound waves to interact with multiple resonance chambers simultaneously. This porous configuration enhances high-frequency amplification by providing numerous pathways for sound wave interaction
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
Efficient amplification of intake noise across a broad frequency range, enhancing the sporty feel and feedback for vehicle drivers by effectively resonating low, middle, and high-frequency sounds.
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
Figure 1
Figure 2
Figure 3
AI summary
An intake noise amplifying system (20) of an internal combustion engine (1) of a vehicle is provided to a branch pipe (10) branching from an intake passage (2) of the engine and transmitting intake noise into a cabin (R) of the vehicle. The system includes a plate-shaped vibration body (21) which vibrates by intake pulse from the intake passage, a first case (22) disposed in the branch pipe on an intake passage side of the vibration body, and a second case (26) 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 (25) having a grid (25a, 25b) dividing the vibration body into partitioned parts (25c, 25d), and the other includes a bore plate (29) having bores (29a) each having an area smaller than a minimum area of the partitioned parts.