Context-Based Vehicle Sound Generation for Pedestrian Safety
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Solution Overview
Problem
Hybrid vehicles operating in quiet electric mode can be imperceptible to individuals, particularly visually impaired persons and workers in proximity, leading to safety concerns, as existing noise generation systems are not context-aware and may become irritating or ignored.
Innovation Solution
A context-based sound generation system that uses location sensing and context recognition to determine if a vehicle is within a noise generating zone, activating noise generation above a minimum threshold level only when relevant individuals are present, such as through a noise management system that includes a context recognition component, sensor system, and noise generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If hybrid vehicles operate using only electric motors to reduce noise, then noise level is reduced, but vehicle imperceptibility to individuals increases
Solution Approach 1:
The system dynamically adjusts the vehicle's noise generation based on real-time context. When pedestrians or cyclists are detected in proximity, the system activates the internal combustion engine or noise generator to produce audible warnings. When no vulnerable road users are present, the vehicle operates in quiet electric mode. This dynamic switching resolves the contradiction by making noise generation conditional rather than static.
Solution Approach 2:
The system changes the noise parameter (from silent to audible) based on detected context conditions. The noise management system monitors environmental parameters such as proximity to pedestrians, traffic conditions, and zone classifications, then adjusts the noise output parameter accordingly. This allows the vehicle to transition between imperceptible and perceptible states as needed for safety.
2Reliability
If noise generating systems are activated continuously to ensure vehicle perceptibility, then vehicle presence is audible, but noise pollution and irritation increase
Solution Approach 1:
Instead of continuous noise generation, the system employs periodic or conditional noise activation based on detected contexts. The noise generating mode is activated only during specific periods when vulnerable road users are detected in proximity zones. This periodic activation maintains vehicle perceptibility when needed while avoiding unnecessary noise pollution during normal operation.
Solution Approach 2:
The system applies noise generation locally and selectively in specific zones rather than universally. Different geographic zones are classified with different noise requirements, and the system activates noise generation only in zones where pedestrians or cyclists are detected. This localized approach ensures perceptibility in critical areas while minimizing noise pollution in other areas.
3Reliability
If context-based noise generation is implemented, then safety for vulnerable road users improves, but system complexity increases
Solution Approach 1:
The noise management system integrates multiple functions into a single unified system. It combines pedestrian detection, zone classification, context recognition, and noise generation control in one multi-functional system. This universal approach improves safety by coordinating all these functions while managing complexity through integration rather than separate independent systems.
Solution Approach 2:
The system introduces a noise management system as an intermediary layer between the vehicle's propulsion system and the environment. This intermediary receives inputs from sensors, determines appropriate noise generation based on context, and controls the noise output. This mediator simplifies the overall system architecture by centralizing the decision-making logic for noise generation.
Data Source
AI summary
A method for directing a vehicle to operate in a noise generating mode based on a context is provided. A present location of the vehicle is determined using a location sensing device. Then, it is determined whether the present location of the vehicle is within one or more noise generating zones. In response to determining that the present location of the vehicle is within a noise generating zone, the vehicle is directed to operate in the noise generating mode.