Vehicle approach warning system

Abstract

To provide an acoustic vehicle alerting system that can generate alert sound that allows a pedestrian to easily distinguish whether a vehicle is moving toward the pedestrian or passing around the pedestrian.SOLUTION: An acoustic vehicle alerting system 10 includes: a diaphragm 210 disposed in an internal space and configured to generate sound; and a sound emitter 200 configured to output alert sound to the outside of a vehicle. A control device 100 controls the sound emitter 200. The sound emitter 200 includes: a first sound guide pipe 221 oriented to the front face of the vehicle; and a second sound guide pipe 222 and a third sound guide pipe 223 that are oriented to directions different from that of the first sound guide pipe 221. The first sound guide pipe 221, the second sound guide pipe 222, and the third sound guide pipe 223 resonate the sound emitted from the diaphragm 210 and thus amplitude the sound with frequency according to the pipeline length. The pipeline length of the first sound guide pipe 221 is different from the pipeline lengths of the second sound guide pipe 222 and the third sound guide pipe 223.SELECTED DRAWING: Figure 1

Claims

1. A vehicle approach notification device mounted on a vehicle, which outputs a notification sound to notify the approach of the vehicle, The sound-generating diaphragm is placed in the internal space, A sound emitter equipped with multiple sound guide tubes that emit the aforementioned alarm sound toward the outside of the vehicle, The system comprises a control device for controlling the sound generator, The plurality of sound guide tubes include a first sound guide tube directed toward the front of the vehicle and a second sound guide tube directed in a different direction from the first sound guide tube. The aforementioned plurality of sound guide tubes have a structure that resonates the sound emitted from the diaphragm and amplifies the sound of a frequency corresponding to the length of the tube. The length of the first sound guide tube and the length of the second sound guide tube are different. When the effective range of the notification sound is defined as the range in which the sound pressure of the notification sound output from the sound guide tube is equal to or greater than a predetermined sound pressure, The multiple effective ranges of the multiple notification sounds output from the multiple sound guide tubes are, Multiple sound guide tubes are provided so as to overlap in some areas. Vehicle approach warning device.

2. As the aforementioned plurality of sound conductor tubes, The first sound conductor tube and, The second sound guide tube is provided in the sound maker at an angle to the side of the vehicle with respect to the direction in which the first sound guide tube is directed, The device comprises a third sound guide tube provided in the sound maker at an angle to the side opposite to the second sound guide tube with respect to the direction in which the first sound guide tube is directed, The length of the first sound conductor and the length of the third sound conductor are different. The vehicle approach notification device according to claim 1.

3. The aforementioned sound conductor has a conch shell shape with a spiral-shaped internal structure. The vehicle approach notification device according to claim 1.

4. The diaphragm generates white noise across a wide frequency range. The vehicle approach notification device according to claim 1.

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