Vehicle Sound Reproduction Control for Vibration-Isolated Engine Audio
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Solution Overview
Problem
Existing engine sound generators face issues with vibration transmission efficiency due to the cowl structure and glass sealer, leading to rattle problems, poor resonance quality, and increased costs and weight, as well as noise generation from welding, which affects the quality of sound reproduction in vehicles.
Innovation Solution
A sound reproducing apparatus that includes a communication network, processor, input device, and memory to receive vehicle state information and control the reproduction of post-combustion noise, slip sound, and acceleration sound based on user-specific patterns, using a microphone, acceleration detector, and speaker to adjust sound volume and timbre, and generate noise canceling signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the engine sound generator is mounted on the cowl structure through a metal bracket, then the sound reproducing apparatus can be installed, but vibration is transmitted to the windshield glass side causing rattle problems and timbre degradation
Solution Approach 1:
The patent introduces a vibration isolation member as an intermediary component between the engine sound generator and the cowl structure. This mediator absorbs and isolates vibrations, preventing them from being transmitted to the windshield glass and cowl panel, thereby eliminating rattle problems while maintaining installation feasibility
Solution Approach 2:
The patent replaces the traditional rigid mechanical connection (metal bracket with welding) with a vibration isolation system that uses elastic or damping materials. This substitution eliminates the direct mechanical transmission path for vibrations while still providing structural support for mounting the sound generator
2Strength
If welding is used to couple the bracket to the cowl panel, then structural strength is improved, but noise is generated and quality costs for structural reinforcement and vibration isolation increase
Solution Approach 1:
The patent replaces the welding process with alternative joining methods such as adhesive bonding or mechanical fastening combined with vibration isolation. This substitution eliminates welding noise while maintaining adequate structural strength through the combination of joining methods and vibration isolation design
Solution Approach 2:
The patent converts the potential harm of welding noise and structural reinforcement costs into a benefit by using vibration isolation members that reduce the need for heavy structural reinforcement. The vibration isolation itself becomes the primary solution, eliminating the need for additional noise control measures
3Ease of manufacture
If the bracket length is increased to facilitate welding gun access, then ease of manufacture is improved, but the transmission efficiency of vibration is lowered
Solution Approach 1:
The vibration isolation member acts as an intermediary that decouples the vibration transmission path from the bracket length. By placing the isolation member between the sound generator and the cowl structure, the system achieves effective vibration isolation regardless of bracket dimensions, allowing optimal bracket length for manufacturing without compromising vibration transmission efficiency
Data Source
AI summary
A vehicle includes a speed detecting device provided to detect a driving speed, a pressure detecting device provided to detect a pressure applied to a brake pedal, a power information obtaining device provided to obtain power information of a power device, and a sound reproducing apparatus provided to determine whether the vehicle is in a start state or a driving state according to driving speed information detected by the speed detecting device, pressure information detected by the pressure detecting device, and the power information, control reproduction of post-combustion noise when the processor concludes that the vehicle is in the start state, control reproduction of a slip sound in response to an acceleration command or a deceleration command when the vehicle is in the driving state, and control reproduction of an acceleration sound corresponding to an acceleration force when the vehicle is accelerating in the driving state.