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Vehicle existence notification apparatus

A notification and vehicle technology, applied in signaling devices, vehicle components, acoustic signaling devices, etc., can solve problems such as increased product cost, low versatility, and high product cost

Inactive Publication Date: 2012-09-19
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, such an ultrasonic generating element SS with an ultra-light-weight vibration mechanism has low versatility, thereby increasing product cost
As a result, the vehicle presence notification device using such a parametric speaker has a high product cost

Method used

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  • Vehicle existence notification apparatus
  • Vehicle existence notification apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0027] The vehicle is equipped with a vehicle presence notification device. The vehicle may be an electric vehicle powered by battery or fuel cell technology, or it may be a hybrid vehicle powered by an electric motor and an engine, where the engine is turned off while the vehicle is running or stopped. Vehicles are primarily quiet vehicles that generate very little or no noise or sound, and are usually not equipped with an engine. The vehicle presence notification device notifies pedestrians of the existence or appearance of a vehicle through a notification sound, wherein the notification sound can be a single sound, a polyphonic sound, a piece of music, a pseudo engine sound, and the like.

[0028] refer to figure 2 with 3 , the vehicle presence notification device includes a parametric speaker 1 , a vehicle horn 4 and a control unit 5 . The parametric speaker emits ultrasonic sound waves via the ultrasonic speaker 2 . The in-vehicle horn 4 emits a notification sound wi...

no. 2 example

[0095] A second embodiment of the present disclosure is now described. As described above, since each piezoelectric speaker 3 in the ultrasonic speaker 2 is configured to generate audible sound, the piezoelectric speaker 3 can directly emit sound waves having an audible frequency (ie, audible sound).

[0096] Therefore, the control circuit 5 of the second embodiment simultaneously generates sound waves and ultrasonic sound waves in the audible frequency band.

[0097] More practically, the control circuit 5 supplies the ultrasonic sound wave signal modulated by the ultrasonic modulation unit 33 and the notification sound signal bypassing the ultrasonic modulation unit 33 to the ultrasonic drive amplifier 34 to drive each piezoelectric speaker 3 .

[0098] In this mode, the following sounds are generated:

[0099] (i) within the directivity range of the parametric speaker 1, a synthesized sound composed of the notification sound directly reproduced by the parametric speaker 1 ...

no. 3 example

[0108] As described above, the piezoelectric speaker 3 is capable of generating ultrasonic sound waves and sound waves within the audible frequency band. Therefore, when the piezoelectric speaker 3 generates ultrasonic sound, it can simultaneously generate resonant sound within the audible frequency band.

[0109] Therefore, in the present embodiment, the vehicle presence notifying device simultaneously generates sound waves of a plurality of different frequencies within the audible frequency band from each piezoelectric speaker 3, and those sound waves are configured to have a chord relationship with each other, which constitutes To the human ear it sounds like a composite sound of comfortable sounds.

[0110] More practically, if the piezoelectric speaker 3 generates a resonant sound of A Hz within the audible frequency band when generating ultrasonic sound waves, the vehicle presence notification device of the present embodiment simultaneously generates a first supplementar...

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PUM

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Abstract

A vehicle existence notification apparatus, disposed in a vehicle, emits a notification sound to notify the surrounding area of the approach or presence of the vehicle. The vehicle existence notification apparatus includes a parametric speaker that serves as a supersonic speaker for emitting a supersonic sound wave, where the parametric speaker performs supersonic modulation to a notification sound signal, which produces the notification sound. The parametric speaker also serves as an audible-sound generating piezoelectric speaker that has a primary resonance component that vibrates at a frequency in an audible frequency band. The parametric speaker sets a supersonic modulation frequency of the notification sound to a sound-pressure increase frequency in a supersonic frequency band reproducible by the audible-sound generating piezoelectric speaker, at which a sound pressure increases due to a high order harmonic resonance.

Description

technical field [0001] The present disclosure generally relates to a vehicle presence notification device that generates a notification sound to an area outside a vehicle to notify pedestrians and the like around the vehicle of the presence of the vehicle. Background technique [0002] A vehicle presence notification device is proposed in Japanese laid-open patent application 2005-289175 (JP '175). The vehicle presence notification device in JP'175 generates a notification sound for notifying the presence of a vehicle via an electrodynamic speaker. [0003] The parametric speaker used to generate sound with strong directionality can also be used to generate notification sound at a distance from the vehicle. The parametric speaker outputs the audible sound from the ultrasonic speaker after ultrasonic modulation of the waveform signal of the audible sound. Ultrasonic waves, which are inaudible sounds, are output from the ultrasonic speakers, and have modulated sound componen...

Claims

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Application Information

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IPC IPC(8): B60Q5/00G10K11/20G08C23/02
CPCG10K15/02B60Q5/008
Inventor 中山利明
Owner DENSO CORP
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