Active Sound Correction for Electric Vehicle Passenger Compartment
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Solution Overview
Problem
Electric vehicles generate insufficient noise at low speeds, posing a safety risk for visually impaired individuals and others, while maintaining quiet interiors enhances driver comfort, necessitating a method to actively introduce sound while preserving comfort.
Innovation Solution
A method and device that use correction signals paired with the sound source and sound-transmitting structure to damp or amplify sound introduced into the passenger compartment, allowing for real-time adjustment based on data from a central control unit or sound detection means to ensure safety and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound is actively generated outside the passenger compartment to warn road users, then safety is improved, but driving comfort deteriorates due to increased interior noise
Solution Approach 1:
The patent applies local quality by differentiating the treatment of sound in different spatial zones. The correction signal is specifically tailored to counteract sound transmission into the passenger compartment while allowing sound to propagate freely in the exterior environment. This is achieved by positioning correction signal means at specific locations (e.g., near sound sources or transmission paths) to create localized acoustic correction zones without affecting the overall exterior sound field.
Solution Approach 2:
The correction signal acts as an intermediary element between the externally generated sound and the passenger compartment interior. By introducing this intermediate acoustic signal through correction signal means, the system mediates the sound transmission process to achieve desired interior acoustic conditions while maintaining exterior sound generation for safety purposes.
2Object-affected harmful factors
If passive acoustic damping measures are implemented to reduce interior noise, then driving comfort is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical/passive acoustic damping systems with an active electronic control system. Instead of using physical damping materials and complex passive acoustic structures, the invention uses electronically generated correction signals and correction signal means to actively manage interior sound levels, thereby reducing device complexity while maintaining effectiveness.
Solution Approach 2:
The system dynamically adjusts acoustic parameters by generating correction signals with specific characteristics (amplitude, frequency, phase) that change based on operating conditions. This allows the acoustic environment to be optimized for different scenarios without requiring multiple fixed passive damping configurations, simplifying the overall system design.
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
Effectively introduces sound into the passenger compartment in a damped or amplified state to enhance safety and comfort, reducing the need for passive acoustic damping measures and allowing for individual adjustment of sound intensity.
Implementation Method 1
a correction signal is generated by means of correction signal means which are paired with the sound source and/or a sound-transmitting structure of the motor vehicle and that the correction signal is determined such that the sound is introduced into the passenger compartment in a damped or amplified state
Data Source
AI summary
The invention relates to a method (30) for damping and/or amplifying a sound introduced into a passenger compartment (10) of a motor vehicle, in particular an electrically driven motor vehicle, said sound being generated (32) by a sound source (22) arranged outside of the passenger compartment (10). A correction signal is generated (40) by means of correction signal means (16) which are paired with the sound source (22) and/or a sound-transmitting structure (20) of the motor vehicle, and the correction signal is determined (38) such that the sound is introduced into the passenger compartment (10) in a damped or amplified state.