Intake Device Resonator Chamber Layout for Low Natural Frequency
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Solution Overview
Problem
Existing intake devices for internal combustion engines face challenges in minimizing size while achieving a low natural frequency for the resonator, as enlarging the resonator chamber or extending the inlet passage increases the device's overall size.
Innovation Solution
The intake device incorporates a case with a dust side chamber, a clean side chamber, and a first resonator chamber, where the first resonator chamber is defined between the case's peripheral wall and one of the chambers, communicating with the other via a long first communication passage along the peripheral wall, maximizing its length without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resonator chamber volume is increased or the inlet passage length is extended to lower the natural frequency, then the natural frequency is reduced, but the overall size of the intake device increases
Solution Approach 1:
The communication passage is designed to extend along the peripheral wall of the case, utilizing the circumferential dimension rather than only the axial dimension. This allows the passage to achieve greater effective length within the limited radial and axial space of the intake device, thereby lowering the natural frequency without proportionally increasing the overall device volume.
Solution Approach 2:
The resonator chamber is positioned within the existing case structure, utilizing the available internal space efficiently. The communication passage is routed through the peripheral wall, nesting the resonator system within the case boundaries rather than requiring external expansion, thus achieving low natural frequency while maintaining compact overall dimensions.
2Reliability
If the communication passage is extended to lower the natural frequency, then the natural frequency is reduced, but the device complexity increases
Solution Approach 1:
By routing the communication passage along the peripheral wall rather than extending it axially or radially in a straightforward manner, the passage achieves greater length through the circumferential dimension. This dimensional approach simplifies the overall configuration by utilizing the natural geometry of the case rather than requiring complex multi-directional routing.
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
This configuration allows for a low natural frequency of the resonator without enlarging the intake device, efficiently arranging resonator chambers and communication passages to optimize space usage and prevent foreign matter entry.
Implementation Method 1
The natural frequency of a resonator consisting of a Helmholtz resonator is determined by the volume of the chamber (cavity, resonator chamber), the length of the inlet passage (neck, communication passage) of the chamber, and the opening area of the inlet passage.
Data Source
AI summary
In an intake device for an internal combustion engine, a first resonator chamber (61) is defined between a clean side chamber (56) and a peripheral wall (8) of a case (2), and a first communication passage (61B) communicating a dust side chamber (55) with the first resonator chamber is extending along the peripheral wall of the case.