EV Cornering Sound Generation Using Tire Slip Cues
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Solution Overview
Problem
Electrification vehicles lack a recognizable sound when turning, making it difficult for pedestrians to detect their approach, and existing virtual engine sound systems face issues with excessive quality costs and vibration insulation due to structural reinforcement and vibration-related problems.
Innovation Solution
An apparatus and method that detect the vehicle's cornering state using sensors, analyze longitudinal and lateral forces, tire slip ratio, and slip angle to generate a tire slip sound, which is adjusted based on predicted slip ratios and angles, and controlled to be played at appropriate times, using a processing device connected to a sound output system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a virtual engine sound system (VESS) or acoustic vehicle alerting system (AVAS) is installed to generate engine sound, then pedestrians can recognize the approaching vehicle, but allophone occurs in weld parts of the body cowl bracket and cowl top cover, requiring excessive quality costs for structural reinforcement and vibration insulation
Solution Approach 1:
The patent extracts the sound generation function from the traditional VESS/AVAS system that uses the body cowl structure, and relocates it to a dedicated sound generation apparatus. This separates the harmful vibration effects from the weld parts of the cowl while maintaining the beneficial pedestrian alert function. The ESG is mounted on a separate bracket structure rather than being integrated into the cowl, thus eliminating allophone in the original structure.
Solution Approach 2:
The patent introduces a dedicated sound generation apparatus as an intermediary between the vehicle and the environment. This apparatus includes an electronic sound generator (ESG) mounted on a separate bracket structure, which acts as a mediator to generate alert sounds without directly coupling with the vehicle's body cowl structure, thereby avoiding vibration transmission and allophone issues.
2Power
If the ESG is mounted on the cowl top panel to generate structure vibration sound, then additional sound is produced, but quality costs for structural reinforcement and vibration insulation become excessive
Solution Approach 1:
The patent segments the sound generation system from the vehicle body structure. Instead of mounting the ESG directly on the cowl top panel as an integrated system, it creates a separate sound generation apparatus with its own mounting bracket. This segmentation allows the sound generation function to be added without requiring structural reinforcement of the original cowl, thereby reducing manufacturing costs while maintaining sound output capability.
3Reliability
If structural reinforcement is implemented to prevent allophone, then vibration insulation improves, but manufacturing cost increases significantly
Solution Approach 1:
The patent extracts the sound generation system from the original cowl structure and places it on a separate dedicated bracket. This extraction eliminates the need for structural reinforcement of the cowl to prevent allophone, as the ESG no longer directly couples with the cowl weld parts. The vibration insulation function is achieved through the separate mounting structure rather than reinforcing the original structure.
Data Source
AI summary
An apparatus and a method for generating a sound of an electrification vehicle are provided. The apparatus comprises a detection device configured to detect state information of a vehicle, a sound output device configured to play and output a virtual sound, and a processing device connected with the detection device and the sound output device. The processing device configured to detect a cornering state of the vehicle based on state information of the vehicle, analyze a longitudinal force, a lateral force, a tire slip ratio, and a tire slip angle according to the cornering state, calculate a cornering force based on the analyzed results, calculate a contact force based on a tire ground surface and road surface profile based on big data, generate a tire slip sound based on the cornering force and the contact force, and control the sound output device to play the tire slip sound.