Engine Intake Noise Device Preventing Condensation Adhesion

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Solution Overview

Problem

Existing intake noise increasing devices in engine bays are affected by condensation due to temperature changes, leading to frequency deviation and reduced noise volume as condensation adheres to the vibrating membrane, disrupting the intended sound propagation to the cabin.

Innovation Solution

The intake system design includes a cylindrical bellows part with a vibrating membrane and an outer circumferential case, where the deriving and introducing passage sections are positioned to separate from the intake noise increasing device, allowing condensation to be easily discharged, and the center axes of these passages intersect on the opening plane, ensuring minimal noise loss and effective vibration of the membrane.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the intake noise increasing device is mounted in the engine bay, then the device can be integrated into the vehicle structure, but condensation forms according to temperature changes and adheres to the vibrating membrane, causing frequency deviation and noise volume decrease

Engineering Contradiction:

Improveintegration of intake noise increasing deviceVSAvoidfrequency stability of intake noise

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The bellows part is separated from the outer circumferential case, with the deriving passage section connected to the outer circumferential case rather than directly to the bellows part. This segmentation prevents condensation formed in the outer circumferential case from adhering to the vibrating membrane on the bellows part, resolving the contradiction between integration and frequency stability.

Inventive Principle:

Principle #1Segmentation

2Length of moving object

If the deriving passage section is connected directly to the bellows part, then the noise propagation path is shortened, but condensation adheres to the vibrating membrane causing frequency deviation

Engineering Contradiction:

Improvenoise propagation path lengthVSAvoidfrequency accuracy of intake noise

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The outer circumferential case serves as an intermediary structure between the deriving passage section and the bellows part. Condensation forms in the outer circumferential case but is prevented from reaching the vibrating membrane, thus the intermediary structure protects the frequency accuracy while still allowing noise propagation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If the vibrating membrane is formed integrally with the bellows part, then the structure is simplified, but condensation adherence reduces vibration ease and causes frequency deviation

Engineering Contradiction:

Improvestructural simplicity of bellows and membraneVSAvoidvibration responsiveness of membrane

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

While the vibrating membrane remains integrally formed with the bellows part for structural simplicity, the deriving passage section is connected to the outer circumferential case rather than directly to the bellows part. This creates a spatial separation that prevents condensation from the passage from adhering to the membrane, preserving both structural simplicity and vibration responsiveness.

Inventive Principle:

Principle #1Segmentation

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 prevents frequency changes and noise volume decreases by ensuring condensation does not adhere to the vibrating membrane, allowing the intake noise to be propagated at the designed frequency with minimal loss to the cabin.

Implementation Method 1

configured to expand and contract in the cylindrical axis direction... configured to increase intake pressure in response to an intake air pressure wave

Methodology Applied

Scientific EffectPressure wave: Acoustic Radiation Pressure

Implementation Method 2

a vibrating membrane formed integrally with the bellows part... the vibrating membrane vibrates less easily because of the influence of the mass of the condensation

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 3

condensation may form according to a change in temperature inside the engine bay between an engine start and an engine stop

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentUS11781510B2Engine intake system

Publication Date: 2023.10.10 MAZDA MOTOR CORP

AI summary

An intake system of an engine is provided, which includes a first passage provided to an engine bay, for leading fresh air to the engine, a second passage branched from the first passage and extending toward a cabin, and an intake noise increasing device provided to the second passage. The intake noise increasing device has a cylindrical bellows part, a vibrating membrane formed integrally with the bellows part to close a first opening of the bellows part, and an outer circumferential case provided to cover an outer circumference of the bellows part and configured to allow the expansion and contraction of the bellows part therein. The second passage has a deriving passage section connected to a part of the outer circumferential case on a first opening side and extending toward the cabin. The deriving passage section is disposed to be lowered while separating from the intake noise increasing device.