Exhaust Flow Valve Geometry for Low-Noise Gas Routing

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Solution Overview

Problem

Existing exhaust systems for internal combustion engines face inefficiencies and power loss due to complex geometries and undercuts, leading to undesirable sound emissions and backflow issues, particularly in high-performance engines.

Innovation Solution

A gas flow and sound control valve with a spoon-shaped section that rotates within a housing to direct exhaust gas between two outlets, optimizing aerodynamics and minimizing undercuts, while maintaining a constant cross-sectional area and curvature for improved flow and reduced noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a switch valve with swinging flap is used to guide exhaust gas, then production efforts are minimized and structure is simplified, but sound transmission is disturbed and power loss occurs due to complex geometry and undercuts

Engineering Contradiction:

Improveproduction effortsVSAvoidpower loss

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The valve member is designed with a spoon-shaped section featuring continuously curved surfaces that guide exhaust gas smoothly from the inlet to either outlet. The curved geometry eliminates sharp edges and undercuts, ensuring undisturbed flow and preventing energy loss while maintaining simple manufacturing.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The valve member is divided into functionally distinct sections: a spoon-shaped flow-guiding section with curved surfaces for smooth exhaust gas direction, and a shaft section for rotational actuation. This segmentation allows each part to be optimized for its specific function while maintaining overall simplicity.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If a switch valve with swinging flap is used to guide exhaust gas, then production efforts are minimized and structure is simplified, but sound transmission is disturbed due to complex geometry and undercuts

Engineering Contradiction:

ImprovestructureVSAvoidundesirable sound emissions

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The continuously curved surfaces of the spoon-shaped valve member create smooth flow paths that prevent turbulence and vortex formation. This curved geometry eliminates the sharp edges and undercuts that cause sound generation, while the simple one-piece construction maintains low device complexity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Adaptability or versatility

If Y-shaped pipe junctions are arranged upstream from valve devices, then exhaust gas can be directed through main or bypass outlets, but unintended echo chambers are created resulting in undesirable sound emission

Engineering Contradiction:

Improveexhaust gas direction controlVSAvoidsound emission

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The Y-shaped housing with continuously curved surfaces guides exhaust gas smoothly from the inlet to either outlet without creating sharp corners or dead zones. This curved geometry prevents echo chamber formation while maintaining the ability to direct exhaust gas through different paths for versatile control.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Productivity

If bypass exhaust line is left open to control exhaust gas division, then flow distribution is achieved, but vortices and echoes are generated causing power loss

Engineering Contradiction:

Improveexhaust gas flow controlVSAvoidpower loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The continuously curved surfaces in the Y-shaped housing and spoon-shaped valve member create smooth transition zones that guide exhaust gas efficiently. This eliminates sharp edges and dead zones that generate vortices and echoes, maintaining high productivity while minimizing energy loss.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 engine efficiency by minimizing power loss and undesirable sound emissions, providing improved aerodynamic and acoustic performance by ensuring undisturbed exhaust gas flow and reducing vortices and echoes.

Implementation Method 1

The valve member can be moved relative to the housing between a first predetermined position in which the valve member closes the second conduit and a second predetermined position in which the valve member closes the first conduit

Methodology Applied

Scientific EffectAerodynamic flow:

Implementation Method 2

the inside surface of the spoon-shaped section defines a curved flow path for the exhaust gas defining a radius of curvature

Methodology Applied

Scientific EffectCurved flow path:

Data Source

PatentEP3660290B1Gas flow and sound control valve and exhaust gas system

Publication Date: 2021.07.28 AKRAPOVIC D D

Figure 1a~2
Figure 3a~3d
Figure 4~7

AI summary

Gas flow and sound control valve for an exhaust system of an internal combustion engine comprising a housing including an inlet, a first outlet, and a second outlet, and a valve member arranged within the housing for forming a first conduit connecting the inlet to the first outlet and/or a second conduit from the inlet to the second outlet, wherein the valve member can be moved relative to the housing between a first predetermined position in which the valve member closes the second conduit and a second predetermined position in which the valve member closes the first conduit, whereby the valve member is rotatable around a valve axis aligned parallel, in particular coaxial, to a centerline of the inlet.