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Vehicle approach warning apparatus

A technology for warning devices and vehicles, which is applied in the directions of signal devices, vehicle components, and sound signal devices, etc., can solve the problems of high volume of warning sounds and discomfort of passengers.

Inactive Publication Date: 2012-07-25
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The warning sound disclosed in JP '175 can be heard by persons within a short range of the vehicle, but not by persons further away towards whom the vehicle is driving
[0004] Furthermore, generating and outputting a warning sound through an electrodynamic speaker would require the generated sound to have a large sound pressure level, resulting in a large volume of the generated warning sound, which is uncomfortable for the occupants of the vehicle

Method used

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Examples

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Embodiment Construction

[0021] In the following embodiment, a vehicle (approach) warning device is explained with reference to the drawings, but the present disclosure is not limited to this embodiment. In the embodiment and in its modifications, the same numerals show the same parts.

[0022] (configuration)

[0023] The vehicle in this embodiment is a quiet vehicle that hardly produces sound when the vehicle is running, such as an electric car, a hybrid car, or the like. The vehicle is equipped with a vehicle (approach) warning device for notifying the surrounding area of ​​the presence and approach of a vehicle through a parametric speaker 1 outputting ultrasonic waves and a vehicle horn 3 operating as a dynamic speaker.

[0024] refer to figure 1 , The vehicle (approaching) warning device is equipped with a vehicle horn 3, an ultrasonic speaker 5, and a control circuit 6. The vehicle horn 3 may be an electromagnetic type horn capable of generating sound, and the ultrasonic speaker 5 is capable...

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PUM

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Abstract

A vehicle (approach) warning apparatus generates a warning sound that is emitted from a parametric speaker (1) and a vehicle horn (3), by driving the vehicle horn (3) with a rectangular wave signal of 0 volts or more, thereby preventing a power loss due to a counter electromotive force that is caused by an alternation of a plus electric voltage and a minus electric voltage in the horn as well as preventing a problematic distortion of the warning sound from the horn. Further, since the vehicle (approach) warning apparatus is devised to prevent the parametric speaker (1) from generating a low pitch sound of 500 Hz that is reproduced by the horn (3), an influence of a higher harmonic wave upon a reproduced sound from the parametric speaker (1) is reduced, thereby preventing deterioration of a sound from the parametric speaker (1).

Description

technical field [0001] The present disclosure generally relates to a vehicle (approach) warning device that generates a warning sound for warning pedestrians and the like around the vehicle of the approach of the vehicle. Background technique [0002] Vehicles powered by electric motors can run almost silently. The absence of sound is problematic because it provides little warning to pedestrians around the vehicle or other motorists of an approaching vehicle. In Japanese Patent Laid-Open No. 2005-289175 (JP '175), a warning device that outputs sound to notify other things in the vicinity of a running vehicle is disclosed. [0003] The warning sound disclosed in JP '175 can be heard by persons within a short range of the vehicle, but not by persons further away towards whom the vehicle is traveling. [0004] Furthermore, generating and outputting a warning sound through an electrodynamic speaker would require the generated sound to have a large sound pressure level, resulti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60Q9/00B60Q5/00
CPCB60Q5/008
Inventor 中山利明铃木浩司渡边义秋
Owner DENSO CORP
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