Vehicle Sound Generator Pressure Equalization Hole Design
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Solution Overview
Problem
Existing sound generators for vehicles face reliability issues, particularly when submerged in water, due to unreliable pressure compensation valves that can be damaged by impacts, dust, and water, leading to membrane offset and reduced acoustic performance.
Innovation Solution
A sound generator design featuring a pressure compensation valve with a valve body and valve head, positioned to extend through the loudspeaker plane, providing precise pressure compensation and an air reservoir to maintain operation even when submerged, using materials like stainless steel and acrylonitrile butadiene styrene (ABS) for durability and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure compensation valve is used in the sound generator, then pressure compensation is achieved, but the valve is unreliable when submerged in water due to impacts, dust, and water damage
Solution Approach 1:
The patent removes the pressure compensation valve entirely from the sound generator design. Instead, it uses a pressure equalization hole that allows pressure equalization between the front and rear volumes without requiring a mechanical valve component that is susceptible to water, dust, and impact damage.
Solution Approach 2:
The patent introduces a pressure equalization hole as an intermediary structure that mediates pressure balance between the front and rear volumes. This simple opening replaces the complex pressure compensation valve mechanism, eliminating reliability issues while maintaining pressure equalization function.
2Adaptability or versatility
If the sound generator is submerged in water, then vehicle noise manipulation can continue in water environments, but pressure compensation becomes unreliable leading to membrane offset
Solution Approach 1:
The patent eliminates the pressure compensation valve that fails in water environments and replaces it with a pressure equalization hole that reliably maintains pressure balance between front and rear volumes even when submerged, preventing membrane offset.
Solution Approach 2:
The patent changes the pressure compensation mechanism from an active valve-controlled system to a passive pressure equalization system through a pressure equalization hole, allowing pressure parameters to equalize automatically between front and rear volumes regardless of water submersion.
3Reliability
If a pressure compensation valve is positioned on the sound generator, then pressure compensation is provided, but the valve can be damaged by impacts and environmental factors
Solution Approach 1:
The patent removes the vulnerable pressure compensation valve component entirely and replaces it with a pressure equalization hole that has no moving parts or mechanical components susceptible to impact or environmental damage.
Solution Approach 2:
The patent uses a simple pressure equalization hole instead of an expensive, complex pressure compensation valve. The hole is essentially a permanent structural feature that cannot fail from wear or damage, eliminating maintenance and replacement 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 reliability and cost-effectiveness of sound generators by ensuring reliable pressure compensation and maintaining acoustic performance, even when fully immersed in water, while reducing the risk of membrane offset and increasing durability.
Implementation Method 1
The pressure compensation valve provides a fluid communication between a volume enclosed by the loudspeaker together with the casing and an outside of the casing
Implementation Method 2
The term 'loudspeaker' is hereby understood as that part of the sound generator that transduces electrical signals into mechanical oscillations (sound)
Implementation Method 3
the sound waves from the sound generator have to have the same amplitude and frequency as the sound waves propagating through the exhaust system but are shifted by 180 degrees in phase
Data Source
AI summary
A sound generator (100) mounts on a vehicle to manipulate vehicle noise originating from a vehicle operated by an internal combustion engine. The sound generator (100) includes a casing (110), a loudspeaker (120), and at least one pressure compensation valve (130). The loudspeaker (120) and the casing (110) together thereby enclose a volume (115). Further, the pressure compensation valve (130) couples the volume (115) enclosed by the loudspeaker (120) and the casing to an outside of the casing (110). The pressure compensation valve (130) thereby extends through a plane in which the loudspeaker (120) is located. A system (200) for manipulating sound waves propagating through exhaust systems of vehicles driven by an internal combustion engine uses the above sound generator (100).