Fluidically Isolated Resonator for Engine Noise Control
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Solution Overview
Problem
Existing air inlet systems in internal combustion engines require multiple components to control noise emissions, which occupy valuable space, add weight, and increase material costs.
Innovation Solution
An air inlet system with fluidically isolated resonators mounted to the intake manifold system, utilizing tuning passages to connect with the inlet duct, allowing for compact packaging and lighter material usage, while suppressing pressure pulses to modify sound emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional resonators are integrated into the air inlet system, then noise emission control is achieved, but package space is occupied, weight increases, and material costs increase
Solution Approach 1:
The resonator is merged with the intake manifold system by mounting it to the manifold while maintaining fluidic isolation. This integration allows the resonator to benefit from the manifold's structural support and packaging space, reducing the need for separate mounting structures and heavy materials while still achieving noise control through acoustic coupling to the inlet duct.
Solution Approach 2:
The resonator is designed to serve multiple functions: noise control through pressure pulse suppression, structural support by mounting to the intake manifold, and fluidic connection to the inlet duct through a separate tuning passage. This multi-functionality reduces the need for additional components and materials.
2Object-affected harmful factors
If traditional resonators are integrated into the air inlet system, then noise emission control is achieved, but package space is occupied
Solution Approach 1:
The resonator utilizes the intake manifold's volume and structural space for mounting, reducing the resonator's own volume requirements. The tuning passage provides the necessary acoustic connection without requiring the resonator to be directly integrated into the main air flow path, optimizing space utilization.
Solution Approach 2:
The resonator is positioned in the vertical dimension by mounting it to the underside of the intake manifold, utilizing three-dimensional space efficiently. This arrangement allows the resonator to occupy space that would otherwise be unused while maintaining clear access to the inlet duct through the tuning passage.
3Ease of manufacture
If resonators are fluidically connected to the intake manifold system, then integration is simplified, but pressure pulses from the manifold interfere with resonator tuning
Solution Approach 1:
The fluidic connection is segmented into two separate pathways: the intake manifold system for charge air delivery and the tuning passage for resonator acoustic coupling to the inlet duct. This segmentation prevents pressure pulse interference from the manifold while maintaining the resonator's noise control function through the dedicated tuning passage connection.
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
Enables a compact, lightweight resonator configuration that effectively suppresses pressure pulses and modifies sound emissions, reducing weight and material costs while maintaining desired noise characteristics.
Implementation Method 1
At least one resonator suppresses pressure pulses within the inlet duct. At least one resonator is mounted to the intake manifold system but has a tuning passage for connecting the resonator's tuning volume to the inlet duct.
Implementation Method 2
The resonator suppresses pressure pulses within the inlet duct so as to modify the engine's sound emission signature, to achieve a desired tuning.
Data Source
AI summary
An air inlet system for an internal combustion engine includes an air inlet duct for drawing charge air into a charge air processor, and an intake manifold system leading from the charge air processor to the power cylinders of the engine. A resonator which suppresses pressure pulses within the inlet duct is mounted to the intake manifold system, but fluidically connected to the air inlet duct, and not to the intake manifold system.