Virtual Exterior Noise Simulation for EV Speed Perception
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Solution Overview
Problem
Electric vehicles lack the auditory cues of engine noise, making it difficult for drivers to intuitively sense speed and driving dynamics, which can lead to a less engaging and less realistic driving experience.
Innovation Solution
A method to simulate a virtual noise source positioned outside the vehicle, laterally offset and adjustable based on vehicle speed, using real noise sources within the vehicle, such as speakers, to create a realistic auditory feedback of passing noise sources, with varying distances and frequencies corresponding to speed and torque demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If real noise sources are used to simulate virtual noise sources inside the vehicle, then the driver receives auditory feedback, but the driving experience remains unrealistic without engine noise
Solution Approach 1:
The patent creates virtual noise sources that copy the acoustic characteristics of real-world stationary noise sources (such as roadside environments). By simulating these external noise sources and making them appear stationary relative to the vehicle, the system provides realistic auditory feedback that helps the driver perceive speed, effectively copying the acoustic experience of driving past real stationary objects.
2Device complexity
If the virtual noise source position is fixed relative to the vehicle, then the system is simple to implement, but the driving dynamics and acceleration perception are not accurately represented
Solution Approach 1:
The patent implements dynamic positioning of virtual noise sources that adapt to changing driving conditions. The system adjusts the position and characteristics of virtual noise sources based on vehicle acceleration, braking, and cornering actions. This dynamic adaptation allows the system to accurately represent driving dynamics while maintaining a relatively simple implementation through software-based control of existing audio equipment.
3Ease of operation
If multiple virtual noise sources are used to improve acceleration perception, then the auditory feedback becomes more realistic, but the system complexity increases
Solution Approach 1:
The patent segments the virtual acoustic environment into multiple discrete noise sources positioned at different locations (front, rear, left, right). Each virtual noise source can be independently controlled and adjusted based on driving conditions. This segmentation allows the system to create realistic acceleration and braking perceptions by manipulating multiple sound sources, while the modular approach keeps system management relatively simple.
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
Enhances the driver's perception of speed and driving experience by providing a more realistic and engaging auditory feedback, simulating the sensation of passing stationary noise sources, thus improving the overall driving experience, especially in electric vehicles.
Implementation Method 1
The real noise sources can be, in particular, loudspeakers which are also used for generating other noises in the motor vehicle
Data Source
AI summary
A method for simulating a noise in a motor vehicle includes the steps of defining a virtual noise source in a position outside the motor vehicle; simulating a noise from the virtual noise source, wherein the simulation takes place using real noise sources inside the motor vehicle; and changing the position of the virtual noise source relative to the motor vehicle depending on a speed of the motor vehicle.