Virtual Engine Sound Waveform Synchronization and Environmental Compensation
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Solution Overview
Problem
Existing methods for generating virtual engine sounds struggle with time synchronization with actual engine waveforms and are not robust against environmental changes, leading to issues like destructive interference and varying sound volumes due to temperature and usage conditions.
Innovation Solution
A method and system that determine a basic waveform based on engine variables like RPM and phase angle, correct it based on environmental variables such as temperature, and further adjust it based on reaction variables like accelerator pedal position and vehicle speed to generate a final waveform that is time synchronized and robust against environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the virtual engine sound is generated using a preset actual engine sound line based on engine RPM, then the sound volume can be matched to the target engine sound line, but the waveform may not be time synchronized with the actual engine sound, causing destructive and constructive interference
Solution Approach 1:
The patent changes the parameter representation from using preset sound volume lines to using waveform parameters (amplitude, frequency, phase) that are dynamically adjusted based on engine RPM and crankshaft phase angle. This allows precise time synchronization while maintaining reliable sound volume output.
Solution Approach 2:
The system uses feedback from the actual engine sound waveform analysis to adjust the virtual engine sound generation. By comparing the actual engine sound characteristics with the generated virtual sound, the system optimizes timing synchronization and prevents interference issues.
2Measurement precision
If the actual engine sound line is preset by experiment at room temperature, then the sound characteristics are accurately captured under standard conditions, but the sound volume varies with environmental changes such as temperature and duration of use
Solution Approach 1:
The patent transitions from static preset sound lines to dynamic waveform generation that adapts to environmental conditions. The system continuously adjusts waveform parameters based on real-time engine operating conditions, temperature, and usage duration, making the virtual engine sound robust across varying environments while maintaining measurement precision.
Solution Approach 2:
The system performs preliminary characterization of engine sound across multiple environmental conditions and usage durations, storing this data for later compensation. This preliminary action enables the system to pre-calculate correction factors that maintain sound accuracy under varying environmental conditions.
3Device complexity
If the virtual engine sound is generated without considering environmental variables, then the generation process is simpler, but the sound output is not robust against environmental changes such as temperature and vehicle degradation
Solution Approach 1:
The patent introduces environmental parameter compensation by changing the generation process to include temperature, usage duration, and vehicle age as input variables. These parameters modify the waveform characteristics dynamically, ensuring reliable sound output across different environmental conditions without significantly complicating the overall system.
Data Source
AI summary
A method for generating a virtual engine sound and a virtual engine sound generating system using the same involve determining a basic waveform of a virtual engine sound based on engine variables including an engine RPM, primarily correcting a basic level of the basic waveform based on environmental variables to determine a primarily corrected waveform, secondarily correcting the primarily corrected waveform based on reaction variables to determine a final waveform, and generating a virtual engine sound having the final waveform through a sound generation device.