Regenerative Braking Sound Control Using Motor Torque Change
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Solution Overview
Problem
Electric vehicles lack a recognizable sound when operating, posing safety risks for pedestrians, and existing virtual engine sound systems face challenges with excessive quality and vibration insulation costs due to structural reinforcement issues.
Innovation Solution
An apparatus and method for generating a virtual sound based on the change in motor torque during regenerative braking, using a detection device to identify pedal manipulation and a processing device to generate and output a regenerative braking sound, which includes filtering techniques to optimize the sound output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a virtual engine sound system (VESS) or acoustic vehicle alerting system (AVAS) is installed to generate engine sound, then pedestrian safety is improved, but quality costs for structural reinforcement and vibration insulation become excessive
Solution Approach 1:
The patent extracts the ESG from its traditional mounting location on the cowl top panel and relocates it to the front bumper. This extraction from the problematic structural area eliminates the need for structural reinforcement and vibration insulation measures, thereby reducing quality costs while maintaining the sound generation function for pedestrian safety
Solution Approach 2:
The patent introduces a sound guide as an intermediary component between the ESG and the external environment. The sound guide directs the generated sound waves outward without requiring the ESG to be mounted on structurally sensitive areas, thus avoiding the need for structural reinforcement and vibration insulation while still achieving effective sound propagation for pedestrian alerting
2Reliability
If an electronic sound generator (ESG) is mounted on the cowl top panel to generate virtual engine sound, then engine sound generation is achieved, but allophone occurs in weld parts causing excessive quality costs
Solution Approach 1:
The patent extracts the ESG from the cowl top panel mounting location and relocates it to the front bumper. This removes the source of vibration and sound generation from the area where allophone occurs in weld parts, eliminating the need for costly structural reinforcement and vibration insulation while preserving the sound generation function
Solution Approach 2:
The patent uses the front bumper as an alternative mounting location that replicates the sound generation function without the structural complications of the cowl top panel. The front bumper serves as a substitute platform that does not suffer from allophone issues in weld parts, thereby reducing quality costs while maintaining functional equivalence
Data Source
AI summary
An apparatus and a method for generating a sound of an electric vehicle are provided. The apparatus determines whether a current condition may be a regenerative braking condition, generates a regenerative braking sound based on an amount of change in motor torque in the regenerative braking condition, and outputs the generated regenerative braking sound.