JP6103345B2 - Vehicle approach notification device - Google Patents

Description

  The present invention relates to a vehicle approach notification device that controls a vehicle approach sound for notifying the outside of a vehicle of the approach of the host vehicle, for example, in an electric vehicle or an electric hybrid vehicle.

  A vehicle using an electric motor as a drive source, such as an electric vehicle or an electric hybrid vehicle, hardly emits noise when traveling at a low speed as compared with an engine vehicle. For this reason, in low-noise vehicles such as electric vehicles and electric hybrid vehicles, vehicles that notify the pedestrian of the approach of the vehicle by generating a vehicle approach sound for notifying the outside of the vehicle of the approach of the vehicle Equipped with an approach reporting device.

  The vehicle approach notification device starts to sound a vehicle approach sound when the vehicle speed falls below the first threshold, and controls the vehicle approach sound to gradually increase over a predetermined time until a predetermined volume is reached (fade in). Also, when the vehicle speed falls below the second threshold value, which is smaller than the first threshold value, the mute of the vehicle approach sound is started, and the vehicle approach sound is gradually reduced over a predetermined time until the vehicle approach sound is completely silenced. Control (fade out).

  In the vehicle approach notification device, so-called frequency change control that changes the frequency of the vehicle approach sound in accordance with the vehicle speed may be used so that the pedestrian can audibly recognize the movement of the vehicle. In the frequency change control, specifically, the frequency of the vehicle approach sound is increased as the vehicle speed increases (see Patent Document 1).

JP 2012-66688 A JP 2008-195137 A

  By the way, the vehicle approach notification device described above sets the fade-out time to a predetermined time (for example, 3 seconds). The fade-out is started when the vehicle reaches a predetermined speed (second threshold). Therefore, when the vehicle stops suddenly or slowly, there is a gap between the fade-out end timing and the actual vehicle stop timing, and the vehicle is stopped but the vehicle approaching sound is sounding. There may be a situation in which the vehicle approach sound stops before stopping. As described above, if there is a difference between the fade-out end timing and the actual vehicle stop timing, the pedestrian or the driver is uncomfortable.

  In the frequency change control in the vehicle approach notification device described above, the change in the vehicle speed and the change in the frequency are relatively harmonized at the time of acceleration, but at the time of sudden deceleration, the frequency also increases with the rapid change in the vehicle speed. Because it changes, it makes the listener uncomfortable.

  In Patent Document 1, when the brake is operating at a predetermined vehicle speed or less, it is determined that the degree of danger in front of the vehicle is large, and a vehicle approach sound having a higher notification effect than a normal vehicle approach sound is generated. A vehicle approach notification device configured as described above is disclosed. However, the invention of Patent Document 1 is not made by paying attention to the difference between the fade-out end timing and the actual stop timing of the vehicle. Moreover, it is not made in order to solve the problem in the frequency change control mentioned above.

  At least one embodiment of the present invention has been made in view of the problems described above, and suppresses a deviation between the fade-out end timing and the actual vehicle stop timing regardless of the driving state of the vehicle. An object of the present invention is to provide a vehicle approach notification device that makes pedestrians and drivers feel as uncomfortable as possible.

  Another object of the present invention is to provide a vehicle approach notification device that makes the listener as uncomfortable as possible when the frequency of the vehicle approach sound suddenly changes, such as during sudden deceleration of the vehicle. Yes.

In order to achieve the above-described object, at least one embodiment of the vehicle approach notification device of the present invention is provided.
In the vehicle approach notification device for controlling the vehicle approach sound for notifying the outside of the vehicle of the approach of the host vehicle,
An approach sound generating means for generating the vehicle approach sound when the vehicle speed of the vehicle falls below a predetermined first threshold;
When the vehicle speed of the vehicle is equal to or less than a second threshold value that is smaller than the first threshold value, an approach sound silencer that silences the vehicle approach sound with a constant fade-out time while gradually reducing the vehicle approach sound;
Deceleration detecting means for detecting deceleration of the vehicle;
Fade-out start speed setting means for setting the second threshold based on the deceleration of the vehicle;
It has.

  The vehicle approach notification device configured in this manner sets a second threshold value that is a fade-out start speed based on the deceleration of the vehicle. Specifically, the second threshold is set to a larger value so that the fade-out starts at an earlier timing when the deceleration is large than when the deceleration is small.

  In this way, since the second threshold value that is the fade-out start speed can be set according to the deceleration of the vehicle, the fade-out can be started at an earlier timing as the deceleration is larger. Regardless of this, it is possible to suppress a deviation between the fade-out end timing and the actual stop timing of the vehicle.

In one embodiment of the present invention,
Representative deceleration setting means for setting the deceleration of the vehicle when the vehicle speed of the vehicle reaches a predetermined third threshold smaller than the first threshold as a representative deceleration;
The fade-out start speed setting means is configured to set the second threshold based on the representative deceleration.

  According to such a configuration, it is possible to set the second threshold value that is the fade-out start speed according to the deceleration (representative deceleration) when the vehicle decelerates to the third threshold value. Since the fade-out can be started earlier as the deceleration is larger with reference to the deceleration, the deviation between the fade-out end timing and the actual vehicle stop timing can be kept small regardless of the driving state of the vehicle. It becomes possible.

In one embodiment of the present invention,
The fade-out start speed setting means sets the second threshold value within the range of the first speed or less and the second speed or more smaller than the first speed,
When the vehicle speed of the vehicle is decelerated to the third threshold while the brake is off,
The fade-out start speed setting means is configured to set the second speed as the second threshold value.

The deceleration in the brake OFF state is very small. For this reason, when the vehicle is decelerated to the third threshold value in the brake OFF state, it is efficient to set the second speed that is the minimum value within the predetermined range as the second threshold value that is the fade-out start speed.
In this specification, the brake OFF state means a state where the brake pedal of the vehicle is not depressed, and does not include a state where a so-called engine brake is operating.

In one embodiment of the present invention,
When the vehicle brake is turned from the ON state to the OFF state when the vehicle speed is equal to or lower than the third threshold value,
The fade-out start speed setting means is configured to reset the second threshold set in accordance with the representative deceleration and reset the second speed as the second threshold.

  There is a case where inertial driving is performed in which the vehicle is temporarily driven only by inertial force until the vehicle is sufficiently decelerated until the brake is changed from the ON state to the OFF state and the vehicle stops. Since the vehicle deceleration during such inertial driving is very small, when such inertial driving is performed, the second threshold previously set according to the representative deceleration is reset, and the minimum value within the predetermined range It is efficient to reset the second speed as the second threshold that is the fade-out start speed.

In one embodiment of the present invention,
The deceleration detecting means includes
The deceleration is detected based on the degree of change in the vehicle speed detected by the vehicle speed sensor.

  According to such a configuration, the acceleration of the vehicle can be detected by the vehicle speed sensor mounted on the vehicle without separately providing an acceleration sensor or the like.

  According to at least one embodiment of the present invention, since the second threshold value that is the fade-out start speed can be set according to the deceleration of the vehicle, the difference between the fade-out end timing and the actual vehicle stop timing is achieved. Can be kept small regardless of the driving state of the vehicle. Thereby, it is possible to provide a vehicle approach notification device that makes a pedestrian and a driver as uncomfortable as possible.

  According to one embodiment of the present invention, the second threshold value that is the fade-out start speed can be set according to the deceleration of the vehicle, so that the frequency of the vehicle approaching sound when the vehicle suddenly decelerates can be increased. It is possible to provide a vehicle approach notification device that makes the listener as uncomfortable as possible when changing rapidly.

It is the block diagram which showed the structure of the vehicle approach notification apparatus concerning one Embodiment of this invention. It is a conceptual diagram for demonstrating the vehicle approach notification apparatus at the time of implementing this invention. 3 is a timing chart of vehicle speed and deceleration corresponding to states a to c in FIG. 2. It is a timing chart of the vehicle speed and deceleration when the deceleration changes, and is a diagram for explaining a method of setting a representative deceleration. It is a timing chart of the vehicle speed and deceleration when the deceleration changes, and is a diagram for explaining the operation when the deceleration changes in a state where the vehicle speed falls below the first speed. It is the main flowchart which showed the operation | movement flow of the vehicle approach notification apparatus of this embodiment. FIG. 7 is a subflow diagram of FIG. 6. FIG. 7 is a subflow diagram of FIG. 6. FIG. 7 is a subflow diagram of FIG. 6.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
However, the scope of the present invention is not limited to the following embodiments. The configurations, parameters, dimensions, materials, shapes, relative arrangements, and the like of the component parts described in the following embodiments are not merely intended to limit the scope of the present invention, but are merely illustrative examples.

  FIG. 1 is a block diagram showing a configuration of a vehicle approach notification device according to an embodiment of the present invention. FIG. 2 is a conceptual diagram for explaining a vehicle approach notification device when the present invention is implemented. FIG. 3 is a timing chart of vehicle speed and deceleration corresponding to states a to c in FIG.

  The vehicle approach notification device 1 according to the present embodiment is a device that controls a vehicle approach sound for notifying the vehicle exterior of the approach of the host vehicle, and uses, for example, an electric motor such as an electric vehicle or an electric hybrid vehicle as a drive source. It is configured as a part of an ECU (Electronic Control Unit) mounted on the vehicle.

As shown in FIG. 1, the vehicle approach notification device 1 of the present embodiment includes an approach sound generating means 2 for generating a vehicle approach sound, and a constant fade-out time (for example, 3 seconds) while gradually reducing the vehicle approach sound. Approach sound silencer 3 for muting, fadeout start speed setting means 4 for setting a fadeout start speed in accordance with the representative deceleration of the vehicle, representative deceleration setting means 5 for setting the representative deceleration of the vehicle, vehicle deceleration And a deceleration detecting means 6 for detecting the speed.
Further, the fade-out start speed setting means 4, the representative deceleration setting means 5, and the deceleration detection means 6 are provided in devices other than the vehicle approach notification device 1 and input to the vehicle approach notification device 1. You may comprise.

  Further, the vehicle speed measured by the vehicle speed sensor 10 is input to the vehicle approach notification device 1. Also, a brake ON / OFF signal is input from the brake sensor 12 to notify the brake ON state (with the brake pedal depressed) and the brake OFF state (without the brake pedal depressed).

  The approach sound generating means 2 transmits a signal to the speaker 14 and generates a vehicle approach sound from the speaker 14 when the vehicle speed of the vehicle falls below a predetermined first threshold (for example, 25 km / h). Is configured to notify pedestrians outside the vehicle.

  The approach sound generating means 2 is configured to generate a vehicle approach sound having a frequency corresponding to the vehicle speed so that a pedestrian can audibly recognize the movement of the vehicle. Specifically, a signal is transmitted to the speaker 14 such that the higher the vehicle speed, the higher the vehicle approaching sound frequency, and the lower the vehicle speed, the lower the vehicle approaching sound frequency.

  When the vehicle speed of the vehicle is equal to or lower than a second threshold value (for example, 6 km / h) that is smaller than the first threshold value, the approaching sound silencer 3 reduces a vehicle approaching sound gradually while maintaining a certain fade-out time (for example, 4 seconds). It is configured to mute. This second threshold value corresponds to the speed at which mute of the vehicle approach sound is started (fade out start speed), and is set by the next fade out start speed setting means 4.

  The fade-out start speed setting means 4 compares a representative deceleration that is a representative value of vehicle deceleration with a predetermined deceleration threshold, and sets a second threshold that is a fade-out start speed. The representative deceleration is set as the deceleration of the vehicle when the vehicle speed of the vehicle is decelerated to a predetermined third threshold (for example, 10 km / h) in the representative deceleration setting means 5 described later. The second threshold value is set within a range of a first speed (for example, 10 km / h) that is equal to or less than the third threshold value and a predetermined second speed (for example, 3 km / h) that is smaller than the first speed. .

  Specifically, as conceptually shown in FIGS. 2 and 3, when the vehicle speed of the vehicle is greater than the predetermined deceleration threshold Ga when the vehicle speed is the third threshold (state example a). The first speed (for example, 10 km / h) that is the maximum value in the predetermined range is set as the fade-out start speed (second threshold) Va. Conversely, when the vehicle deceleration is smaller than a predetermined deceleration threshold Gb (Gb <Ga) (state example b), the second speed (for example, 3 km / h), which is the minimum value in the predetermined range, is faded out. Set as start speed (second threshold) Vb. When the vehicle deceleration is G (state example c; G2 <G <G1), the fade-out start speed (second threshold value) V corresponding to the deceleration G is set as the deceleration Ga, Gb and fade-out. For example, it is set in a range of 3 to 10 km / h by proportional calculation based on the relationship between the start speeds Va and Vb.

  Moreover, when the vehicle speed of the vehicle is decelerated to the third threshold value while the brake is OFF, the fade-out start speed setting unit 4 may be configured to set the second speed described above as the second threshold value. Because the deceleration in the brake OFF state is very small, when the vehicle is decelerated to the first speed while the brake is OFF, the second speed that is the minimum value within the predetermined range is set as the second threshold that is the fade-out start speed. Because it is efficient to do.

  As described above, the representative deceleration setting means 5 sets the deceleration of the vehicle when the vehicle speed is reduced to a predetermined third threshold (for example, 10 km / h) as the representative deceleration. The predetermined third threshold value is set as a speed that is smaller than the first threshold value and is equal to or higher than the second threshold value. Then, the representative deceleration setting means 5 transmits the set representative deceleration to the fade-out start speed setting means 4 described above.

  FIG. 4 is a diagram for explaining a method of setting the representative deceleration Gc when the deceleration changes. As shown in FIGS. 4A to 4C, even when the deceleration changes in a state where the vehicle speed is below the first threshold, the vehicle speed when the vehicle speed is reduced to the third threshold The deceleration may be set as the representative deceleration Gc. 4A and 4B as examples, the deceleration G2 in FIG. 4A, the deceleration G2 in FIG. 4B, and the deceleration G3 in FIG. 4C are set as the representative deceleration Gc.

  Further, as shown in FIG. 5A, when the vehicle brake is changed from the ON state to the OFF state when the vehicle speed is equal to or lower than the third threshold value, the fade-out start speed setting means 4 described above is representative. The second threshold set in accordance with the deceleration Gc may be reset and the second speed may be reset as the second threshold.

  This is because, as shown in FIG. 5 (a), the inertia of the vehicle temporarily travels only by inertial force until the vehicle is stopped after the vehicle is sufficiently decelerated until the vehicle is stopped. Driving may be performed. Since the deceleration of the vehicle during such inertial driving is very small, when such inertial driving is performed, the second threshold previously set according to the representative deceleration Gc is reset, and the minimum within the predetermined range is set. This is because it is efficient to reset the value of the second speed as the second threshold value.

  Further, as shown in FIG. 5B, even when the brake is changed from the ON state to the brake OFF state and the vehicle further accelerates, the vehicle speed after acceleration does not exceed the third threshold value. The subsequent deceleration is also slow. Accordingly, in the case shown in FIG. 5B as well, the second threshold value set in advance according to the representative deceleration Gc is reset, and the second speed that is the minimum value within the predetermined range, as in the case described above. May be reset as the second threshold.

  On the other hand, as shown in FIG. 5C, when the brake is changed from the ON state to the brake OFF state and the vehicle further accelerates, if the vehicle speed after acceleration exceeds the third threshold, The deceleration setting means 5 resets the previous representative deceleration Gc ′, and resets the vehicle deceleration when the vehicle speed next decreases to the third threshold value as the representative deceleration Gc. The fade-out start speed setting means 4 is configured to reset the second threshold value reset as the second speed again and to reset the second threshold value again according to the reset representative deceleration Gc. It is good to be.

  With this configuration, after the vehicle brake is changed from the ON state to the OFF state, the fade-out start speed setting means 4 responds to the new representative deceleration Gc when the vehicle speed again exceeds the third threshold value. In order to set the second threshold again, a fade-out start speed closer to the behavior of the actual vehicle is set.

  In addition to the brake operating state described above, the fade-out start speed setting means 4 is also set according to the representative deceleration Gc when the vehicle acceleration is detected in a state where the vehicle speed is equal to or lower than the third threshold value. The second threshold value may be reset. Such a configuration is effective when the vehicle accelerates while the brake is on, for example, on a slope.

  The deceleration detection unit 6 detects the deceleration of the vehicle and transmits the detected deceleration to the representative value setting unit 5. The deceleration detection means 6 of the present embodiment detects deceleration based on the degree of change in vehicle speed detected by the vehicle speed sensor 10. With this configuration, the vehicle acceleration can be detected by the vehicle speed sensor 10 mounted on the vehicle without providing a separate acceleration sensor or the like, so that the vehicle acceleration can be detected with an inexpensive configuration. Is possible.

  As another example of detecting the deceleration, the deceleration detecting means 6 may be configured to detect the deceleration directly from the detection value of the acceleration sensor. Further, the relationship between the vehicle speed and the brake depression amount and the deceleration may be prepared in advance as a map, and the deceleration detection means 6 may be configured to grasp the vehicle deceleration based on the vehicle speed and the brake depression amount. good. If the deceleration detection means 6 is configured in this manner, the deceleration can be detected instantaneously, unlike the case where the deceleration is detected from the change in the vehicle speed described above.

  Next, the operation | movement flow of the vehicle approach notification apparatus 1 of this embodiment is demonstrated based on FIGS. FIG. 6 is a main flow diagram showing an operation flow of the vehicle approach notification device of the present embodiment, and FIGS. 7 to 9 are sub-flow diagrams of FIG.

  In the operation flow of the vehicle approach notification device 1 of the present embodiment, as shown in FIG. 6, first, it is determined whether the vehicle speed has fallen below the first threshold (S1). When the vehicle speed falls below the first threshold value, a signal related to the approaching sound generation is transmitted from the approaching sound generating means 2, and a vehicle approaching sound is generated from the speaker 14 (S2).

  Then, it is determined whether or not the brake is detected (S3). If the brake is detected, the deceleration at that time is stored as a temporary representative deceleration (S4). The operation flow when the brake ON is not detected will be described later.

  Next, it is determined whether the brake operation has been changed from the ON state to the OFF state (S5). When the brake operation is changed from the ON state to the OFF state, after resetting the stored temporary representative deceleration (S6), it is determined whether or not the vehicle is accelerating as shown in the sub-flow of FIG. (S7). If the vehicle is not accelerating, the determination in S3 is performed again. If the vehicle is accelerating, it is next determined whether the vehicle speed is equal to or higher than the first threshold (S8). If the vehicle speed is equal to or higher than the first threshold, the vehicle approach sound is stopped (S9), and the determination of S1 is performed again. On the other hand, when the vehicle speed is less than the first threshold, the determination of S7 is performed again.

  Further, at this time, when the brake ON-OFF is repeatedly performed in a short time as in a so-called pumping brake operation, a predetermined time or more has elapsed since the temporary representative deceleration is prevented from being reset repeatedly in order to prevent the temporary representative deceleration from being reset. In such a case, the temporary representative deceleration may be reset (S6).

  Note that S4 to S7 are not required when the vehicle deceleration is detected directly from the acceleration sensor or when the vehicle deceleration is detected from the brake depression amount.

  Next, it is determined whether or not the vehicle speed has reached the third threshold value (S10). If the vehicle speed has not reached the third threshold, the process returns to S4 again. If the vehicle speed has reached the third threshold value, the representative deceleration is set with the stored temporary representative deceleration as the representative deceleration (S11). When the vehicle deceleration is detected directly from the acceleration sensor or from the brake depression amount, the deceleration when the vehicle speed reaches the third threshold may be set as the representative deceleration (S11).

  Next, the fade-out start speed setting means 4 described above compares the representative deceleration with a predetermined deceleration threshold, and sets a second threshold that is a fade-out start speed (S12). Then, a signal related to the set fade-out start speed (second threshold value) is transmitted to the approach sound silencer 3 described above.

  Next, it is determined whether the brake operation has been changed from the ON state to the OFF state (S13). When the brake operation is changed from the ON state to the OFF state, as shown in FIG. 8, the previously set fade-out start speed (second threshold value) is reset (S14), and the fade-out start speed (second threshold value) is reset. Is reset to the second speed which is the minimum value in the predetermined range (S15). Then, it is determined whether or not the vehicle is accelerating (S16). If the vehicle speed exceeds the third threshold value (Yes in S17), the reset second threshold value is reset again (S18). Then, the determination of S3 is performed again in order to set the second threshold again in accordance with the deceleration (representative deceleration) when the vehicle speed next decreases to the third threshold. On the other hand, when the vehicle is not accelerating (No in S16), the determination in S13 is performed again.

  If No in S13, that is, if the brake operation is ON, it is determined whether the vehicle speed has reached the fade-out start speed (second threshold) (S19), and the vehicle speed has reached the fade-out start speed (second threshold). If so, fade-out is started (S20). Then, it is determined whether the fade-out is completed (S21). If the fade-out is not completed, the determination of S13 is performed again. In S19, when the vehicle speed has not reached the second threshold value, the determination in S13 is performed again. When the fade-out is completed, the series of operations is terminated, and the operation flow starts again.

  Further, when the brake ON is not detected in S3 described above, it is determined whether the vehicle speed has reached the third threshold as shown in FIG. 9 (S22). If the vehicle speed has reached the third threshold value, it is determined that the vehicle is slowly decelerating in the brake OFF state, and the fade-out start speed (second threshold value) is the minimum value in the predetermined range. The speed is set (S23), and then the determination of S13 is performed. On the other hand, if the vehicle speed has not reached the second threshold, the determination in S3 is performed again.

  According to the vehicle approach notification device 1 configured as described above, the fade-out start speed setting unit 4 that sets the fade-out start speed (second threshold) according to the deceleration of the vehicle is provided. Fading out can be started at an early timing. Therefore, regardless of the driving state of the vehicle, it is possible to suppress a deviation between the fade-out end timing and the actual vehicle stop timing.

  Further, since the fade-out can be started at an earlier timing and the mute of the vehicle approach sound can be advanced as the deceleration is larger, the volume of the vehicle approach sound when the frequency is rapidly changed can be reduced. Thereby, it is possible to make the listener as uncomfortable as possible.

As mentioned above, although the preferable form of this invention was demonstrated, this invention is not limited to said form, A various change in the range which does not deviate from the objective of this invention is possible.
For example, in the above-described embodiment, the deceleration is calculated from the vehicle speed detected by the vehicle speed sensor, but the wheel speed may be directly detected, and the present invention is not limited to this.
In the above-described embodiment, the deceleration is calculated from the vehicle speed detected by the vehicle speed sensor. However, the deceleration may be estimated from the amount of depression of the brake, and is not limited to this.
In the above-described embodiment, the vehicle speed is detected by the vehicle speed sensor, but may be estimated from a GPS sensor, a collision detection acceleration G sensor, or the like, and is not limited thereto.
In the embodiment described above, the deceleration when the vehicle speed reaches the third threshold is set as the representative value of the deceleration, but is not limited to this, for example, an average value of the deceleration, The representative value of deceleration may be determined based on the expected value of deceleration, the total deceleration (integrated amount), the differential value of deceleration, or the difference (change amount) from the previous value.
Further, the time taken for the vehicle speed to drop from the speed to the third threshold value may be measured by a timer, and the representative value may be determined based on the time.
In the above-described embodiment, the first speed is the upper limit value of the second threshold value. However, for example, the second threshold value may be the same speed as the first speed. Thereby, it becomes possible to refer to the deceleration immediately before the fade-out, and it is possible to perform the approach notification sound control more suitable for the state of the vehicle.

  At least one embodiment of the present invention is mounted on an electric vehicle or an electric hybrid vehicle driven by a motor as a vehicle approach notification device for controlling a vehicle approach sound for notifying the vehicle exterior of the approach of the host vehicle.

DESCRIPTION OF SYMBOLS 1 Vehicle approach notification apparatus 2 Approach sound generation means 3 Approach sound mute means 4 Fade out start speed setting means 5 Representative deceleration setting means 6 Deceleration detection means 10 Vehicle speed sensor 12 Brake sensor 14 Speaker

Claims (4)

In the vehicle approach notification device for controlling the vehicle approach sound for notifying the outside of the vehicle of the approach of the host vehicle,
An approach sound generating means for generating the vehicle approach sound when the vehicle speed of the vehicle falls below a predetermined first threshold;
When the vehicle speed of the vehicle is equal to or less than a second threshold value that is smaller than the first threshold value, an approach sound silencer that silences the vehicle approach sound with a constant fade-out time while gradually reducing the vehicle approach sound;
Deceleration detecting means for detecting deceleration of the vehicle;
Fade-out start speed setting means for setting the second threshold based on the deceleration of the vehicle;
Representative deceleration setting means for setting the deceleration of the vehicle when the vehicle speed of the vehicle has reached a third threshold smaller than the first threshold as a representative deceleration;
Equipped with a,
The fade-out start speed setting means sets the second threshold based on the representative deceleration, and the vehicle approach notification device. The fade-out start speed setting means sets the second threshold within a range of a first speed that is less than or equal to the third threshold and a second speed that is less than the first speed,
When the vehicle speed of the vehicle is decelerated to the third threshold while the brake is off,
2. The vehicle approach notification device according to claim 1 , wherein the fade-out start speed setting unit is configured to set the second speed as the second threshold value. When the vehicle brake is changed from the ON state to the OFF state in a state where the vehicle speed is lower than the third threshold value,
The fade-out start speed setting means is configured to reset the second threshold set in accordance with the representative deceleration and reset the second speed as the second threshold. The vehicle approach notification device according to claim 2 . The deceleration detecting means includes
Vehicle approach warning apparatus according to any one of claims 1, characterized in that it is configured to detect the deceleration based on the vehicle speed of the change degree of the vehicle detected by the vehicle speed sensor 3.

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