Electric Vehicle Fuel Cell Sound Generation for Pedestrian Safety
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Solution Overview
Problem
Electric vehicles and hybrid electric vehicles lack an engine driving sound, which can lead to pedestrians being unaware of their approach, increasing the risk of accidents due to the different driving sound profile compared to conventional vehicles.
Innovation Solution
An electric vehicle system that includes a fuel cell system, a controller, a sound source generating unit, and a sound output unit to produce a sound similar to an engine driving sound based on the state of the fuel cell, using fuel cell information to determine normal or abnormal conditions and adjust the sound output accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electric vehicles use motor-driven propulsion without engine sound, then energy efficiency and environmental friendliness are improved, but pedestrian awareness and safety are worsened
Solution Approach 1:
The patent introduces a sound generation system as an intermediary element that mediates between the silent motor-driven propulsion and the need for pedestrian awareness. The system generates artificial engine-like sounds through speakers positioned in the vehicle, creating an auditory signal that alerts pedestrians to the vehicle's presence and movement without requiring actual engine combustion.
Solution Approach 2:
The sound generation system is segmented into multiple independent components including multiple speakers distributed at different locations on the vehicle, a control unit that processes fuel cell information, and a sound source database. This segmentation allows the system to generate different sound patterns selectively based on vehicle operating conditions while maintaining energy efficiency.
2Object-generated harmful factors
If electric vehicles operate silently, then environmental pollution is reduced, but driver feedback and operational awareness are worsened
Solution Approach 1:
The patent implements a feedback mechanism where the sound generation system provides auditory feedback to the driver about vehicle operating conditions. The control unit monitors fuel cell information such as temperature, voltage, and current, and generates corresponding sound patterns that reflect the vehicle's operational state, giving the driver awareness of system conditions without requiring traditional engine noise.
Solution Approach 2:
The system changes sound parameters including frequency, amplitude, and timbre based on fuel cell operating parameters such as temperature, voltage, and current output. This allows the vehicle to provide driver feedback about system status through variations in the generated sound, replacing the information previously conveyed through engine noise with controlled acoustic signals.
3Object-affected harmful factors
If electric vehicles generate artificial engine sounds, then pedestrian awareness is improved, but device complexity increases
Solution Approach 1:
The sound generation system is designed with multi-functionality to justify its added complexity. The same system serves multiple purposes: alerting pedestrians to vehicle presence, providing driver feedback about operating conditions, and potentially communicating vehicle intent. This universal application of the sound generation capability helps offset the increased device complexity by delivering multiple benefits from a single system addition.
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
The system enhances driver satisfaction by mimicking engine sounds, improving pedestrian awareness of electric vehicles and reducing the risk of accidents by providing a recognizable sound profile corresponding to the fuel cell's state, thus addressing the unique sound challenges of electric vehicles.
Implementation Method 1
a fuel cell system supplying electric energy to the electric vehicle
Data Source
AI summary
The present invention relates to an electric vehicle and a control method thereof. According to the inventive electric vehicle and control method thereof, the state of a fuel cell that is a driving power of the electric vehicle can be sensed to determine whether the fuel cell system is normal or not, and output different sound sources according to the states of the fuel cell system so that the sound outputted as a driving sound while the electric vehicle runs may vary to allow a driver to recognize the state of the electric vehicle and a change in state of the fuel cell. Also, the awareness of difference in driving of the motor can be decreased through the sound outputted as the driving sound of the electric vehicle to improve the driver's satisfaction and allow pedestrians to more easily recognize approach of the electric vehicle.