EV Interior Sound Control for Presence and Environmental Cues
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Solution Overview
Problem
Existing sound control devices for electric vehicles prioritize the sense of presence through pseudo engine sounds but fail to effectively transmit information about the environmental state to the driver.
Innovation Solution
A sound control method and device that estimate the environmental state of an electric vehicle based on driving and surrounding environment information, process interior sounds accordingly, and output them from room speakers to appropriately convey environmental information while maintaining a sense of presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pseudo engine sound is output to provide a sense of presence, then driver immersion is improved, but environmental state information transmission deteriorates
Solution Approach 1:
The sound control device segments the interior sound into multiple components: pseudo engine sound and environmental state information sound. These segmented sound components are then output at different time points or with different sound levels, allowing both the sense of presence and environmental information transmission to be achieved without mutual interference
Solution Approach 2:
The device employs periodic action by alternately outputting pseudo engine sound and environmental state information sound. The pseudo engine sound provides continuous sense of presence, while environmental information is transmitted periodically through sound level changes or intermittent output, ensuring both functions are fulfilled
2Loss of information
If interior sound is processed with sound process specification, then environmental state information transmission is improved, but device complexity increases
Solution Approach 1:
The sound control device changes sound parameters (sound level, frequency, or time point) of the interior sound to encode environmental state information. By modifying existing sound parameters rather than adding separate processing systems, the device transmits environmental information while keeping the overall system complexity manageable
Solution Approach 2:
The pseudo engine sound serves as an intermediary carrier for environmental state information. Instead of adding a separate information transmission system, the device modulates the pseudo engine sound with environmental information, using the existing sound field as a mediator to convey both sense of presence and environmental data
Data Source
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AI summary
An interior sound to be output from a room speaker (16) of an electric vehicle (10) is generated. An environmental state (EES) of the electric vehicle (10) is estimated based on at least one of information on driving environment of the electric vehicle (10) and information on surrounding environment of the electric vehicle (10). It is determined whether a process condition of the interior sound (EGS) is satisfied based on the estimated result of the environmental state (EES). When it is determined that the process condition of the interior sound (EGS) is satisfied, the interior sound (EGS) is processed based on the information on a sound process specification (PS) corresponding to the estimated result used for the determination of the process condition and is output from the room speaker.