Directional Speaker Pedestrian Warning System
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Solution Overview
Problem
Current pedestrian warning systems for eco-friendly vehicles, such as electric and hybrid vehicles, are costly and inefficient in ensuring pedestrian safety due to the need for multiple speakers to disperse sound evenly, and they do not effectively alert pedestrians of the vehicle's presence or impending turns, potentially leading to collisions and noise pollution.
Innovation Solution
A cost-efficient pedestrian warning system utilizing a directional speaker mounted on the right side of the vehicle, which adjusts sound emission patterns and generates specific alarm sounds for turns, combined with a virtual engine sound system, to alert pedestrians of the vehicle's presence and movements, reducing the number of speakers required and minimizing noise pollution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple speakers are mounted to disperse sound evenly in all directions, then pedestrian safety is improved, but production cost and device complexity increase
Solution Approach 1:
The patent combines multiple speaker functions into a single directional speaker mounted on the right side of the vehicle. This single speaker replaces the need for multiple speakers by strategically positioning itself to cover critical pedestrian zones through controlled sound directionality.
Solution Approach 2:
The patent applies local quality by concentrating sound energy in specific directional zones where pedestrians are most likely to be present (right side and rear areas). Instead of uniform omnidirectional sound distribution, the system tailors sound dispersion to match the actual pedestrian risk distribution around the vehicle.
2Ease of manufacture
If a directional speaker is used to reduce the number of speakers, then production cost is reduced, but sound dispersion coverage may be insufficient
Solution Approach 1:
The patent employs dynamic sound field control that adjusts sound emission patterns based on vehicle operating conditions. The system varies sound distribution characteristics according to vehicle speed, turning status, and operational mode, optimizing coverage for each situation while maintaining cost-effectiveness.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor vehicle state and pedestrian presence, dynamically adjusting sound emission patterns accordingly. This ensures adequate coverage is maintained despite using fewer speakers, as the system adapts to real-time conditions.
3Reliability
If virtual engine sound is generated at low speeds, then pedestrian awareness is improved, but noise pollution increases at higher speeds
Solution Approach 1:
The patent dynamically adjusts the virtual engine sound generation based on vehicle speed. The system activates virtual engine sound at low speeds where it effectively alerts pedestrians, and deactivates or reduces it at higher speeds where natural vehicle noise is sufficient, thereby preventing unnecessary noise pollution.
Solution Approach 2:
The system changes the operational parameters of sound generation based on vehicle speed thresholds. By modifying when and how virtual engine sound is produced according to speed conditions, the system optimizes the balance between pedestrian awareness and noise pollution prevention.
4Device complexity
If alarm sound is directed only in a specific direction, then the speaker system is simplified, but pedestrian safety in other directions is compromised
Solution Approach 1:
The patent applies asymmetry by mounting the speaker on the right side of the vehicle and directing sound primarily toward the right side and rear areas. This asymmetric positioning and directional focus matches the actual pedestrian risk distribution, providing adequate safety in critical zones while simplifying the overall system.
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 effectively alerts pedestrians to the vehicle's presence and impending turns, reducing the risk of collisions and noise pollution while lowering production costs by using fewer speakers and optimizing sound dispersion.
Implementation Method 1
a directional speaker for outputting the amplified pedestrian alarm sound and the amplified virtual engine sound, wherein the directional speaker is mounted to a right side of the vehicle, and adjusts an emission pattern of the pedestrian alarm sound and the virtual engine sound according to regional sound field control
Data Source
AI summary
A pedestrian warning system for an eco-friendly vehicle may include a warning sound controller including an alarm sound controller and a virtual engine sound system configured to inform a pedestrian of a behavior of the vehicle; and an alarm sound output device including not only an amplifier for amplifying a pedestrian alarm sound and a virtual engine sound, but also a directional speaker for outputting the amplified pedestrian alarm sound and the amplified virtual engine sound.