Pedestrian Warning Device with Active Infrared Detection
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Solution Overview
Problem
Alternative fuel vehicles emit low noise, making them less noticeable to pedestrians and increasing the risk of accidents, and existing pedestrian warning systems output sound passively regardless of pedestrian presence, causing noise pollution and failing to provide distance-specific warnings.
Innovation Solution
An acoustic pedestrian warning device with an active pre-warning function, comprising a main control module, voice chip module, power amplifier module, infrared detection module, and ambient noise signal detection module, which actively determines the presence of pedestrians and adjusts sound output based on ambient noise levels and vehicle status, using a road segment memory knob for volume control and a CAN transceiver module for engine noise simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pedestrian warning system passively emits sound regardless of pedestrian presence, then the vehicle becomes noticeable to pedestrians, but noise pollution increases and unnecessary sound output occurs
Solution Approach 1:
The warning system dynamically adjusts its operation based on real-time pedestrian detection. The control unit activates the warning tone only when the detection unit identifies a pedestrian within the warning distance, and deactivates it when no pedestrian is present. This dynamic on-demand operation maintains warning effectiveness while eliminating unnecessary noise pollution during empty road segments.
Solution Approach 2:
The system implements feedback through the detection unit that continuously monitors the environment for pedestrians. The control unit receives detection signals and adjusts the warning tone output accordingly - activating when pedestrians are detected and deactivating when the road is clear. This feedback mechanism ensures the warning system operates only when needed, resolving the contradiction between effectiveness and noise pollution.
2Reliability
If a pedestrian warning system passively emits sound always, then pedestrians are alerted to the vehicle's presence, but the system fails to provide distance-specific warning tones
Solution Approach 1:
The warning system dynamically adapts its behavior based on the detected distance to pedestrians. The detection unit measures distance and the control unit selects appropriate warning tones from different audio files corresponding to different distance ranges. This dynamic adaptation provides distance-specific warnings rather than using a fixed passive tone, enhancing both reliability and adaptability.
Solution Approach 2:
The system changes the parameters of the warning output based on detection data. Different audio files with distinct tones are selected and played according to the detected pedestrian distance. This parameter change in the warning signal characteristics provides distance-specific information to pedestrians, resolving the contradiction between consistent alertness and adaptive warning capability.
3Object-generated harmful factors
If alternative fuel vehicles operate quietly to reduce emissions noise, then environmental pollution decreases, but the vehicles become inconspicuous to pedestrians increasing accident risk
Solution Approach 1:
The warning system performs preliminary action by emitting a pre-warning tone before the vehicle reaches the pedestrian. The detection unit identifies pedestrians at a distance, and the control unit activates the warning tone in advance to alert pedestrians of the approaching quiet vehicle. This preliminary warning compensates for the vehicle's quiet operation, maintaining safety while preserving the environmental benefit of low emissions noise.
Solution Approach 2:
The acoustic warning system acts as an intermediary between the quiet alternative fuel vehicle and pedestrians. It provides the missing auditory signal that the vehicle's natural quiet operation fails to provide, enabling pedestrians to detect the vehicle's presence without requiring the vehicle to emit continuous noise that would compromise its environmental advantage.
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 device ensures that warning sounds are emitted only when pedestrians are present, reducing noise pollution and providing appropriate volume adjustments based on ambient noise, thus enhancing safety and reducing unnecessary sound output.
Implementation Method 1
the infrared detection module detects whether a person is present in the vicinity of the vehicle
Data Source
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AI summary
The present invention discloses an acoustic pedestrian warning device with an active pre-warning function for an alternative fuel vehicle. It comprises an infrared detection module (28) for detecting whether a person is present in the vicinity of the vehicle and for outputting an infrared detection signal, a main control module (21) for receiving the infrared detection signal and for sending a playback command to a speech chip module (22) depending on the infrared detection signal, a speech chip module (22) for sending an acoustic signal to a power amplifier module (23), and a power amplifier module (23) for driving a loudspeaker (27) to play the acoustic signal. The warning device according to the present invention has an infrared detection module (28) and an ambient noise signal detection module (26) and can actively determine whether a tone should be output and largely switch off or reduce the pedestrian warning tone.reduce the problem of the pedestrian warning tone always being emitted regardless of whether there is a pedestrian in front, with the user being able to download a selected tone and also having a road segment memory rotary knob (29) and other functions available, which provides for smarter operation.