JPH0668986U - Running sound generator - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a running sound generating device for producing a running sound in an electric vehicle, and an object thereof is to make a pedestrian surely recognize the approach of a running vehicle. A traveling sound generating means for emitting a sound indicating a traveling state of an electric vehicle, and whether or not the electric vehicle is traveling are monitored, and based on the result of the monitoring, the traveling sound generating means is operated. An interruption control means for interrupting the sound.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a traveling sound generating device that emits a traveling sound in an electric vehicle.

[0002]

[Prior art]

 General vehicles, which are powered by an internal combustion engine, are often used due to their low fuel cost and their superior performance in prime movers. However, in recent years, pollution problems such as air pollution due to exhaust gas and traffic noise have become more serious in urban areas, and in view of the anticipated shortage of petroleum fuel and other energy, it is possible to convert to electric energy without exhaust gas. Electric vehicles, which can use any energy as long as they are available and have a low level of running noise, are in the spotlight and are being put to practical use as forklifts and other vehicles.

[0003]

[Problems to be solved by the device]

 By the way, in such a conventional electric vehicle, the level of the sound generated during traveling is too low, which is advantageous in avoiding noise pollution as described above, but for pedestrians, the vehicle approaches. There was a possibility that a traffic accident could occur because I could not recognize the arrival.

An object of the present invention is to make a pedestrian surely recognize the approach of an electric vehicle while traveling.

[0005]

[Means for Solving the Problems]

 The present invention monitors traveling sound generating means for emitting a sound indicating the traveling state of an electric vehicle and whether or not the electric vehicle is traveling, and based on the result of the monitoring, the traveling sound generating means is used. And an interruption control means for interrupting the sound.

[0006]

In the traveling sound generating device according to the present invention, the intermittent control means, when detecting the traveling state of the electric vehicle, emits a sound that acoustically indicates the traveling state via the traveling sound generating means, and conversely the vehicle is stopped. The pedestrian will be able to recognize the fact that an electric vehicle with low noise while running is approaching the pedestrian by the sound as in a normal vehicle. You can

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention.

In the figure, a generator (G) 11 is mechanically connected to an output shaft of a transmission of an electric vehicle, and its output is an input (coil terminal) of a relay 12 that forms an intermittent control means together with the generator 11. ) Is connected to. A DC power supply line is connected to the power supply terminal of the generator 13 through the output of the relay 12 (built-in make contact), and the output of the generator 13 runs through the amplifier 14 together with the amplifier and the generator 13. It is connected to a speaker 15 forming a sound generating means.

In the traveling sound generating device having such a configuration, the generator 13 stores in advance an electric signal having a waveform corresponding to the acoustic signal indicating the traveling of the electric vehicle. When the electric vehicle runs, the generator 11 is driven by the motor, which is the power source for the running, via the transmission to generate DC power of a predetermined voltage. The relay 12 is excited by such DC power to close the above-mentioned make contact and supplies power to the generator 13 from the DC power supply line. The generator 13 is driven by the electric power supplied in this manner, and sequentially reads and outputs the electric signal having the waveform stored in advance as described above. The amplifier 14 considers the conversion efficiency of the electric-acoustic conversion of the speaker 15 and outputs the above-mentioned electric signal at a power level corresponding to a sound pressure level sufficient for notifying a pedestrian of an approaching electric vehicle. The power is amplified and given to the speaker 15.

Further, when the electric vehicle is stopped, the driving power described above is not transmitted to the output shaft of the transmission. Therefore, the generator 11 is not driven and the above-described make contact is opened, and the generator 13 of the generator 13 is opened. The drive power is lost. Therefore, the above-mentioned electric signal is not given to the input terminal of the amplifier 14.

As described above, according to this embodiment, the generator 13 is supplied with driving power only while the electric vehicle is traveling, and supplies the electric signal indicating the traveling state of the electric vehicle to the amplifier 14, It outputs as a simulated running sound via the amplifier and the speaker 15.

Therefore, in the electric vehicle to which the present embodiment is applied, it is possible for the pedestrian to surely recognize that the moving vehicle is approaching by the sound as in the case of the general vehicle.

In the present embodiment, the generator 13 outputs the electric signal by preliminarily storing and sequentially reading the waveform of the electric signal corresponding to the simulated running sound, but in the present invention, Without being limited to such a method, if it is possible to clearly notify a pedestrian that a moving vehicle is approaching, for example, an oscillating circuit that oscillates by arbitrarily combining audio signals or such an audio signal You may use the intermittent oscillation circuit which oscillates a signal intermittently.

Further, in the present embodiment, the waveform of a single electric signal is stored in advance in the generator 13, but the present invention is not limited to such a configuration, and for example, low speed, medium speed, The electric signals of different waveforms corresponding to the high traveling speed are stored with different amplitudes corresponding to the urban and non-urban areas respectively, and are stored according to the traveling speed detection result and the type of traveling area manually instructed. A method of switching the waveform of the AC signal to be read may be used.

Further, in the present embodiment, a generating circuit 13 for generating an electric signal, an amplifier 14 for amplifying the electric power of the electric signal, and a speaker 15 for electro-acoustic converting the electric signal obtained at the output are combined. Although the running sound generating means is formed, the present invention is not limited to such a configuration, and for example, the pseudo running sound may be mechanically directly generated by the energy interrupted by the interrupt control means.

Further, in the present embodiment, it is monitored whether or not the electric vehicle is running by connecting the generator 11 to the output shaft of the transmission, but in the present invention, such a method is adopted. There is no limitation. For example, a pulse generator that generates a pulse by changing the frequency, phase, amplitude, etc. according to the vibration of the speedometer of an electric vehicle is provided, or the wheel is operated in the same manner as the anti-brake lock system (ABS). It is also possible to generate a pulse with a frequency proportional to the number of revolutions by electromagnetically detecting the rotation of the, and perform the same threshold judgment on the parameters of the pulse thus obtained. The control device for controlling the motor may sequentially detect the number of rotations of the motor, and the detected number of rotations may be subjected to a threshold determination with respect to a predetermined threshold (for example, 800 rpm).

Further, in this embodiment, in order to operate the generator 13 only while the electric vehicle is running, the drive power of the generator is intermittently supplied through the relay 12, but in the present invention, such a method is used. For example, the driving power is continuously supplied to the generator 13 to directly disconnect the output end of the generator or the amplifier 14, or the operation of the oscillation circuit or the amplifier 14 built in the generator 13. May be intermittent.

[0018]

[Effect of device]

 As described above, the present invention detects that an electric vehicle is running and emits a simulated running sound that indicates the running state of the electric vehicle, so that an electric vehicle with a low running sound level approaches a pedestrian. Sounds can be sent to notify you of what has come, just as you can with an ordinary automobile.

Therefore, pedestrian traffic safety is ensured while minimizing the pollution problem due to traffic noise, and the application field of electric vehicles has characteristics that can adapt to the requirements of prevention of air pollution and diversification of energy sources. Is expanded.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 11 Generator 12 Relay 13 Generator 14 Amplifier 15 Speaker

Claims (1)

[Scope of utility model registration request] 1. A running sound generating means for emitting a sound indicating a running state of an electric vehicle and whether or not the electric vehicle is running are monitored, and based on the result of the monitoring, the running sound generating means is used. And an intermittent control means for intermittently producing the sound.