EV Wheel Slip Feedback Using Local Audio and Visual Cues
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Solution Overview
Problem
Electric vehicles, being quieter than internal combustion engine vehicles, lack engine noise as a feedback mechanism for wheel slip, making it difficult for drivers to recognize and address traction loss.
Innovation Solution
Adjusting the output of speakers in response to wheel speed deviations from a reference vehicle speed, using visual and auditory cues to indicate wheel slip and provide targeted feedback to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electric vehicle operates quietly, then energy efficiency is improved, but driver awareness of wheel slip is reduced
Solution Approach 1:
The patent introduces an intermediary sound generation system (speakers mounted on wheel hubs) that mediates between the quiet electric motor operation and the need for driver awareness. The speakers generate artificial wheel slip sounds that simulate the acoustic feedback normally provided by internal combustion engine vehicles, allowing drivers to detect wheel slip conditions without compromising the energy efficiency of electric operation.
Solution Approach 2:
The patent replaces the natural mechanical acoustic feedback from engine combustion with an electronic sound generation system. Instead of relying on the mechanical noise from an internal combustion engine to indicate wheel slip, the system uses electronically generated sounds played through speakers, substituting a mechanical/acoustic system with an electronic one while maintaining the same information feedback function.
2Loss of information
If speaker output is increased to improve wheel slip detection, then driver awareness is enhanced, but noise pollution increases
Solution Approach 1:
The patent applies local quality by positioning speakers at the wheel hubs rather than using a central audio system. This allows the sound to be generated locally at each wheel, providing directional and spatially accurate feedback to the driver about which specific wheel is slipping. The local sound generation also reduces overall noise levels compared to a centralized high-power audio system.
Solution Approach 2:
The system dynamically adjusts speaker output based on detected wheel slip conditions. The speaker output is activated only when wheel slip is detected, and the volume and characteristics of the sound are modulated according to the severity and duration of the slip event. This dynamic operation enhances detection capability when needed while minimizing noise pollution during normal operation.
Data Source
AI summary
Methods and systems are presented for generating visual and audible aids for a human that is driving a vehicle. In one example, a visual indication is provided during conditions when a wheel speed exceeds a vehicle reference speed by more than a threshold speed. In another example, an audible indication is provided during conditions when a vehicle speed exceeds a vehicle reference speed by more than a threshold speed.