Real-time Engine Sound Reproduction via Vibration Analysis
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Solution Overview
Problem
Existing engine sound control techniques for vehicles fail to accurately reproduce engine sounds in real-time based on load variations and power characteristics, leading to artificial sound production without consideration for driver intentions during acceleration or constant speed driving.
Innovation Solution
A real-time engine sound reproduction method that utilizes engine characteristic sensor values to generate engine order-based virtual sounds, combining engine vibration characteristics, drive mode-based outputs, and vehicle speed-based outputs, which are then reproduced through a signal processing controller and audio device, allowing for dynamic sound adjustments during acceleration and constant speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a recorded virtual sound source is played for engine sound control, then interior sound is provided, but the sound does not reflect real-time load variations and power characteristics of the engine
Solution Approach 1:
The patent transitions from static recorded sound playback to dynamic real-time sound generation by continuously adjusting audio parameters based on real-time engine sensor data including load, RPM, and acceleration signals, making the sound reproduction adaptive to changing engine conditions
Solution Approach 2:
The system implements feedback by using engine sensors to detect actual engine operation parameters and feeding this information back to the audio processing unit, which then adjusts the generated engine sound in real-time to accurately reflect the current engine state
2Adaptability or versatility
If a vibrator is mounted to vibrate the vehicle body for sound provision, then artificial sound is produced, but the sound does not consider driver intentions during acceleration or constant speed driving
Solution Approach 1:
The patent replaces the mechanical vibration system with an electronic audio generation system that uses sensors and signal processing to create engine sounds, eliminating the need for physical vibrators while enabling sophisticated control based on driver intention and vehicle operating conditions
Solution Approach 2:
The audio processing unit serves multiple functions by generating different types of engine sounds (acceleration sounds, constant speed sounds, knocking sounds) based on various sensor inputs, replacing what would otherwise require multiple separate sound generation devices
3Ease of operation
If engine sound is continuously reproduced to improve driver enjoyment, then auditory effects are enhanced, but noise, vibration, and harshness performance deteriorates during constant speed driving
Solution Approach 1:
The system dynamically adjusts audio output based on vehicle operating conditions, providing enhanced engine sounds during acceleration and sport modes while reducing or eliminating sound reproduction during constant speed cruising, thereby balancing driver enjoyment with NVH performance
Data Source
AI summary
A real-time engine sound reproduction method includes determining, with a signal processing controller, a drive condition of a vehicle based on a vibration value measured through a sensor for measuring vibration of an engine, and reproducing, with an output device, a controlled engine sound based on an order component indicated by the engine vibration characteristic outputted in real time.