Vehicle horn system

Abstract

The invention provides a vehicle horn system capable of suppressing reduction of sound pressure under the condition that sound quality is not poor. A horn system for a vehicle according to the present invention is provided with: a horn provided in a vehicle; and the cooling part is used for cooling the horn. The horn is configured to include: a housing; and a coil that generates a magnetic force by being supplied with power, the cooling portion being interposed between the case and the coil.

Description

Technical Field

[0001] The present disclosure relates to a horn system for a vehicle. Background Art

[0002] A horn device that can prevent malfunctions while producing a warning sound by performing intermittent operation within a predetermined temperature range has been known in the past (for example, refer to Japanese Patent Application Laid-Open No. 2021-021819).

[0003] For a speaker, when the internal temperature rises, the sound pressure decreases. Therefore, although intermittent operation is performed within a specified temperature range, the sound is interrupted and becomes discontinuous because there is a time when the speaker is not working. In other words, poor sound quality occurs. Summary of the invention

[0004] Therefore, an object of the present disclosure is to obtain a vehicle horn system capable of suppressing a drop in sound pressure without causing deterioration in sound quality.

[0005] A vehicle horn system according to a first aspect of the present disclosure includes a horn installed in a vehicle and a cooling unit that cools the horn.

[0006] According to the first aspect, the horn installed in the vehicle is cooled by the cooling unit, so that the internal temperature of the horn is suppressed from rising, and the sound pressure is suppressed from falling without causing poor sound quality.

[0007] In addition, a second aspect of the vehicle horn system according to the present disclosure is the vehicle horn system according to the first aspect, wherein the horn includes a housing and a coil that generates magnetic force when powered, and the cooling unit is interposed between the housing and the coil.

[0008] According to the second embodiment, the cooling unit is interposed between the housing and the coil that generates magnetic force by being powered. Therefore, the coil is effectively cooled by heat exchange with the housing and the external air. In other words, the rise in the internal temperature of the speaker is effectively suppressed, thereby effectively suppressing the drop in sound pressure.

[0009] Furthermore, a third aspect of the vehicle horn system according to the present disclosure is the vehicle horn system according to the second aspect, wherein the cooling unit is a Peltier element, a heat dissipating side of the Peltier element is in contact with the housing, and a heat absorbing side of the Peltier element is in contact with the coil.

[0010] According to the third aspect, the heat dissipation side of the Peltier element as the cooling unit is in contact with the housing, and the heat absorption side of the Peltier element is in contact with the coil. Therefore, the coil is effectively cooled.

[0011] In addition, the fourth type of vehicle horn system involved in the present disclosure is a vehicle horn system of the second type or the third type, comprising: a control unit that controls the cooling unit; a temperature sensor that detects the temperature of the coil, and the control unit controls the horn in a manner that cools the horn when the temperature of the coil detected by the temperature sensor becomes above a predetermined temperature.

[0012] According to the fourth aspect, the control unit that controls the cooling unit controls the speaker to cool down when the temperature of the coil detected by the temperature sensor becomes equal to or higher than a predetermined temperature. Therefore, the temperature required to ensure the sound pressure can be effectively controlled.

[0013] Furthermore, a vehicle horn system according to a fifth aspect of the present disclosure is the vehicle horn system according to the fourth aspect, wherein the temperature sensor is disposed on the opposite side to the cooling unit with the coil interposed therebetween.

[0014] According to the fifth aspect, the temperature sensor is arranged on the side opposite to the cooling unit with the coil interposed therebetween. Therefore, compared with a case where the temperature sensor is arranged on the same side as the cooling unit, the temperature required to ensure the sound pressure can be appropriately detected.

[0015] As described above, according to the present disclosure, it is possible to suppress a drop in sound pressure without causing deterioration in sound quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a diagram showing a schematic configuration of a vehicle horn system according to the present embodiment.

[0017] Figure 2 It is a schematic front view showing a horn of the vehicle horn system according to the present embodiment.

[0018] Figure 3 for Figure 2 A schematic cross-sectional view taken along line XX.

[0019] Figure 4 It is a graph showing the operation of the vehicle horn system according to the present embodiment.

[0020] Figure 5 It is a flowchart showing the operation of the vehicle horn system according to the present embodiment. DETAILED DESCRIPTION

[0021] Hereinafter, the implementation mode of the present disclosure will be described in detail based on the accompanying drawings. Figure 1 The vehicle horn system 10 shown in FIG. Figure 2 The speaker 12 shown. Figure 2 , Figure 3 As shown, the speaker 12 has a metal housing 14 having a substantially hollow truncated cone shape, and one axial side of the housing 14 is attached to a plate-like support plate 11 .

[0022] like Figure 3 As shown in the figure, an end 16A of an iron core 16 serving as an electromagnet is provided on an axial center portion on one axial side of the housing 14, and a moving bolt 18 is provided on the other axial side of the housing 14 relative to the iron core 16. To explain more specifically, an end face 18A of the moving bolt 18 on one axial side is opposed to an end face 16B of the iron core 16 on the other axial side with a predetermined gap therebetween.

[0023] A disc-shaped diaphragm (vibration plate) 20 is coaxially mounted on the end 18B on the other axial side of the moving bolt 18, and a resonance tube 22 for resonating and amplifying vibration (sound) is disposed oppositely with a predetermined gap at the other axial side of the diaphragm 20. In addition, a metal heat dissipation portion 23 having a function of preventing entry of foreign matter is integrally mounted on at least a portion of the resonance tube 22 shown in the figure.

[0024] In addition, a coil 24 that generates magnetic force by supplying power is provided around the iron core 16 and the moving bolt 18 in the housing 14. The coil 24 generates magnetic force by supplying power, and the magnetic core 16 is magnetized. Then, the moving bolt 18 is attracted by the magnetized iron core 16 and collides with the iron core 16. The vibration (sound) generated by the collision is transmitted to the resonance tube 22 via the diaphragm 20, and the vibration (sound) is resonated and amplified by the resonance tube 22.

[0025] In addition, the diaphragm 20 also has a function of generating a force (elastic restoring force) for returning the moving bolt 18 to its original position when the moving bolt 18 is attracted to the core 16. In addition, a breathing hole 14A is formed at a predetermined position on the housing 14 so that the vibration of the diaphragm 20 is not hindered.

[0026] Furthermore, a contact 26 for turning on and off the power supply to the coil 24 is provided in the housing 14. The contact 26 is connected to the moving bolt 18, and is normally closed to supply power to the coil 24, and is opened when the moving bolt 18 moves to one side in the axial direction, thereby cutting off the power supply to the coil 24. Furthermore, the contact 26 is connected to a terminal 28 for power supply.

[0027] In the housing 14 of the speaker 12 having the above structure, a Peltier element 30 as a cooling unit for cooling the coil 24 and a temperature sensor 32 for detecting the temperature of the coil 24 are provided. Figure 3 As is enlarged and shown in FIG. 1 , the Peltier element 30 is interposed between the housing 14 and the coil 24 so as to be cooled by being powered to generate a temperature difference between one face 30A and the other face 30B.

[0028] That is, the Peltier element 30 is configured such that its heat dissipation side surface 30A contacts the housing 14, and its heat absorption side surface 30B contacts the coil 24. In addition, although not shown in the figure, a terminal for power supply is also provided on the Peltier element 30. In addition, the temperature sensor 32 is arranged on the opposite side of the Peltier element 30 in a manner close to the coil 24 across the coil 24.

[0029] like Figure 1 As shown in FIG. 1 , power is supplied from an auxiliary battery 34 mounted on the vehicle to the coil 24 and the Peltier element 30 constituting the horn system 10 for the vehicle. In addition, a control unit 36 ​​for controlling the power supply to the coil 24 and the Peltier element 30 is mounted on the vehicle, and the control unit 36 ​​is electrically connected to the temperature sensor 32. That is, the control unit 36 ​​controls the power supply to the coil 24 and the Peltier element 30 when the temperature of the coil 24 detected by the temperature sensor 32 reaches a predetermined temperature (threshold value T1: see Figure 4 ) or more, an instruction (signal) is issued to cool the coil 24. In addition, the control unit 36 ​​may be a processor or the like.

[0030] Next, the operation of the vehicle horn system 10 according to the present embodiment having the above-described configuration will be described.

[0031] like Figure 4 As shown, when the temperature of the coil 24 rises, the resistance of the coil 24 increases. Since the current flowing through the coil 24 decreases when the resistance of the coil 24 increases, the magnetic force generated in the coil 24 decreases. When the magnetic force generated in the coil 24 decreases, the sound pressure of the sound generated from the speaker 12 decreases.

[0032] Therefore, in this embodiment, when the temperature of the coil 24 becomes equal to or higher than the threshold value T1, the coil 24 is cooled. Thus, for example, when the temperature of the coil 24 is cooled from T1 to T2, the sound pressure can be increased from S1 to S2. Figure 5 The flowchart shown is used for explanation.

[0033] like Figure 5As shown, in step P1, when the ignition switch (IG) mode is set to start, in step P2, the temperature of the coil 24 is detected by the temperature sensor 32. Then, in step P3, the control unit 36 ​​determines whether the temperature is greater than the threshold value T1, and if it is determined to be less than the threshold value T1, the process returns to step P2 and the temperature of the coil 24 is detected again.

[0034] On the other hand, in step P3, when the control unit 36 ​​determines that the temperature is equal to or higher than the threshold value T1, in step P4, power is supplied to the Peltier element 30 under the control of the control unit 36, thereby cooling the coil 24. Then, in step P5, the temperature of the coil 24 is detected by the temperature sensor 32, and in step P6, the control unit 36 ​​determines whether the temperature is lower than the threshold value T1.

[0035] When the temperature of the coil 24 is not less than the threshold value T1, the power supply to the Peltier element 30 is continued by the control of the control unit 36, and steps P4, P5, and P6 are repeatedly implemented. Then, in step P6, when it is determined by the control unit 36 ​​that the temperature is less than the threshold value T1, in step P7, the power supply to the Peltier element 30 is stopped. Thereafter, in step P8, it is determined whether the ignition switch (IG) mode is continued or not continued (off), and if it is continued, it is repeated from step P1, and if it is off, the control is terminated.

[0036] In this manner, according to the vehicle horn system 10 of the present embodiment, the control unit 36 ​​controls the power supply to the Peltier element 30, thereby suppressing the increase in the internal temperature of the horn 12. Therefore, the sound pressure drop of the sound (warning sound) generated from the horn 12 can be suppressed without causing poor sound quality.

[0037] In particular, the Peltier element 30 is interposed between the housing 14 and the coil 24 that generates magnetic force by being powered (the surface 30A on the heat dissipation side of the Peltier element 30 is in contact with the housing 14, and the surface 30B on the heat absorption side of the Peltier element 30 is in contact with the coil 24). Therefore, the coil 24 is efficiently cooled by heat exchange with the housing 14 and the outside air. In other words, the rise in the internal temperature of the speaker 12 can be effectively suppressed, thereby effectively suppressing the drop in sound pressure.

[0038] In addition, the temperature sensor 32 used for this purpose is arranged on the side opposite to the Peltier element 30 across the coil 24. Therefore, the temperature required to ensure the sound pressure can be appropriately detected compared to the case where the temperature sensor 32 is arranged on the same side as the Peltier element 30. In addition, since the control unit 36 ​​that controls the Peltier element 30 controls the speaker 12 to be cooled when the temperature of the coil 24 detected by the temperature sensor 32 becomes a predetermined temperature (threshold value T1) or more, the temperature required to ensure the sound pressure can be effectively controlled.

[0039] Although the vehicle horn system 10 according to the present embodiment is described above based on the drawings, the vehicle horn system 10 according to the present embodiment is not limited to the illustrated case, and appropriate design changes can be made without departing from the scope of the present disclosure. For example, the cooling unit is not limited to the Peltier element 30. As the cooling unit, for example, the cooling pipe of the air conditioner can be arranged near the coil 24 to cool the coil 24, or it can be cooled by other cooling methods.

[0040] In addition, the vehicle equipped with the vehicle horn system 10 according to the present embodiment is not limited to an electric vehicle. However, in order to reduce the need for cooling the power unit chamber and reduce air resistance, the front grille of an electric vehicle may be reduced, and it may be difficult to ensure the sound pressure of the sound transmitted from the speaker 12 through the front grille. In the vehicle horn system 10 according to the present embodiment, since the sound pressure of the sound can be effectively ensured, it is particularly effective in an electric vehicle with a small front grille.

Claims

1. A vehicle horn system, comprising: A horn, which is provided on the vehicle; A cooling unit cools the speaker.

2. The vehicle horn system according to claim 1, wherein: The speaker is constructed to include: shell; A coil, which generates magnetic force by being powered, The cooling portion is interposed between the housing and the coil.

3. The vehicle horn system according to claim 2, wherein: The cooling unit is a Peltier element, The heat dissipation side of the Peltier element is in contact with the housing, and the heat absorption side of the Peltier element is in contact with the coil.

4. The vehicle horn system according to claim 2 or claim 3, wherein: have: A control unit that controls the cooling unit; a temperature sensor, which detects the temperature of the coil, The control unit performs control so as to cool the horn when the temperature of the coil detected by the temperature sensor becomes equal to or higher than a predetermined temperature.

5. The vehicle horn system according to claim 4, wherein: The temperature sensor is arranged on the opposite side to the cooling unit with the coil interposed therebetween.

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