Sound generation device and sound generation program

Abstract

This sound generation device (20), which is used in a vehicle (10) and executes a sound generation program, comprises an energy sound generation unit (202). The energy sound generation unit (202) acquires a value pertaining to a remaining energy amount (Me) of the vehicle (10). In addition, the energy sound generation unit (202) generates a sound pertaining to the remaining energy amount (Me) by adjusting the amplitude, frequency, and production time of the sound on the basis of the value pertaining to the remaining energy amount (Me). Furthermore, the energy sound generation unit (202) produces the generated sound.

Description

Sound generation device and sound generation program Cross-reference to related applications

[0001] This application is based on Japanese Patent Application No. 2024-221814 filed on December 18, 2024, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates to a sound generation device and a sound generation program.

[0003] Conventionally, as described in Patent Document 1, an energy remaining meter used in a hybrid vehicle that obtains power from different types of first energy sources and second energy sources is known. This energy remaining meter sequentially stacks and displays a first graphic part and a second graphic part that are color-coded corresponding to these energy sources and whose lengths are determined according to the remaining amounts of the respective energy sources.

[0004] Japanese Unexamined Patent Application Publication No. 2011-255777

[0005] When using the energy remaining meter described in Patent Document 1, a driver of a hybrid vehicle cannot know the remaining amount of energy unless they ride in the hybrid vehicle. Therefore, for example, it is difficult for the driver of a hybrid vehicle to notice that the remaining amount of energy is not small.

[0006] An object of the present disclosure is to provide a sound generation device and a sound generation program that allow passengers including the driver of a vehicle to know the remaining amount of energy of the vehicle even when they do not ride in the vehicle.

[0007] According to one aspect of the present disclosure, there is provided a sound generation device for use in a vehicle, the sound generation device including: an acquisition unit that acquires a value related to the remaining amount of energy of the vehicle; an energy sound generation unit that generates a sound related to the remaining amount of energy by adjusting the amplitude, frequency, and generation time of the sound based on the value related to the remaining amount of energy; and an energy sound generation unit that generates the sound generated by the energy sound generation unit.

[0008] Furthermore, according to one aspect of this disclosure, the present invention relates to a sound generation program that causes a sound generation device used in a vehicle to function as an acquisition unit that acquires a value related to the vehicle's remaining energy, an energy sound generation unit that generates a sound related to the remaining energy by adjusting the amplitude, frequency, and generation time of the sound based on the value related to the remaining energy, and an energy sound generation unit that generates the sound generated by the energy sound generation unit.

[0009] This allows the occupants, including the driver, to sense the vehicle's remaining energy level through sound. Therefore, the occupants, including the driver, can know the vehicle's energy level even when they are not inside the vehicle.

[0010] A diagram of the vehicle used in the sound generation device of the first embodiment. A flowchart showing the processing of the energy sound generation unit of the generation section in the sound generation device. A flowchart showing the processing of the consumable sound generation unit of the generation section. A flowchart showing the processing of the key signal generation unit of the generation section. A diagram of the vehicle used in the sound generation device of the second embodiment. A flowchart showing the processing of the sound pressure analysis unit of the generation section in the sound generation device. A flowchart showing the processing of the frequency analysis unit of the generation section. A flowchart showing the processing of the period analysis unit of the generation section. A flowchart showing the processing of the adjustment sound setting unit of the generation section. A flowchart showing the processing of the energy sound generation unit of the generation section. A flowchart showing the processing of the consumable sound generation unit of the generation section. A diagram of the vehicle used in the sound generation device of the third embodiment. A flowchart showing the processing of the energy sound generation unit of the generation section. A flowchart showing the processing of the energy sound generation unit of the generation section. A flowchart showing the processing of the energy sound generation unit of the generation section. A flowchart showing the processing of the consumable sound generation unit of the generation section.

[0011] The embodiments will be described below with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be denoted by the same reference numeral, and their descriptions will be omitted.

[0012] (First Embodiment) The sound generation device that executes the sound generation program of this embodiment is used in a vehicle. This sound generation device allows the occupants, including the driver, to know the remaining energy level of the vehicle even when they are not in the vehicle. First, the vehicle used in the sound generation device will be described.

[0013] Vehicles include, for example, vehicles with internal combustion engines such as gasoline engines and diesel engines, as well as HV, PHV, EV, and FCV. HV stands for Hybrid Vehicle. PHV stands for Plug-in Hybrid Vehicle. EV stands for Electric Vehicle. FCV stands for Fuel Cell Vehicle.

[0014] Furthermore, as shown in Figure 1, the vehicle 10 is equipped with an energy level sensor 12, a tire pressure sensor 14, a brake pad sensor 16, a vehicle light sensor 18, and a sound generation device 20.

[0015] The energy level sensor 12 detects the remaining energy levels Me of the vehicle 10, such as the remaining fuel, battery level, and hydrogen level. Furthermore, the energy level sensor 12 transmits a signal corresponding to the detected energy level Me to the sound generation device 20, which will be described later.

[0016] The tire pressure sensor 14 detects the tire pressure Pt of the vehicle 10. The tire pressure sensor 14 also transmits a signal corresponding to the detected tire pressure Pt to the sound generation device 20, which will be described later.

[0017] The brake pad sensor 16 detects the cumulative mileage of the vehicle 10 and the rotation of the vehicle's brake pedal. Furthermore, the brake pad sensor 16 estimates the brake pad usage time Tb from the detected cumulative mileage and the rotation of the vehicle's brake pedal. The brake pad sensor 16 also transmits a signal corresponding to this estimated brake pad usage time Tb to the sound generation device 20, which will be described later. Note that the brake pad usage time Tb is the cumulative time that the brake pads of the vehicle 10 (not shown) have been used.

[0018] The vehicle light sensor 18 measures the on-time of vehicle lights such as headlights, parking lights, fog lights, taillights, brake lights, backup lights, license plate lights, interior lights, and daytime running lights of the vehicle 10. Furthermore, the vehicle light sensor 18 calculates the light usage time Tc from the measured on-time. The vehicle light sensor 18 also transmits a signal corresponding to the calculated light usage time Tc to the sound generation device 20, which will be described later. Note that the light usage time Tc is the cumulative time that the vehicle lights are illuminated.

[0019] The sound generator 20 acquires signals from the energy level sensor 12, the tire pressure sensor 14, the brake pad sensor 16, and the vehicle light sensor 18. Furthermore, the sound generator 20 generates sound based on these acquired signals. The sound generator 20 also emits this generated sound. Furthermore, based on these acquired signals, the sound generator 20 transmits a signal to the electronic key 100 related to the vehicle 10 to illuminate the electronic key 100. Details of the sound generator 20 will be described later.

[0020] Furthermore, the electronic key 100 is a key related to the vehicle 10 and includes a signal generating unit and a key lamp (not shown). The signal generating unit includes a signal transceiver (not shown), an unlocking switch, and a locking switch. When the signal transceiver receives a signal transmitted from the vehicle 10 by touching the inner surface of the door handle of the vehicle 10 while the electronic key 100 is being carried, it transmits a signal to the vehicle 10 to unlock the doors of the vehicle 10. Furthermore, when the signal transceiver receives a signal transmitted from the vehicle 10 by touching the outer surface of the door handle of the vehicle 10 while the electronic key 100 is being carried, it transmits a signal to the vehicle 10 to lock the doors of the vehicle 10. When the unlocking switch is pressed while the electronic key 100 is being carried, it transmits a signal to the vehicle 10 to unlock the doors of the vehicle 10. When the locking switch is pressed while the electronic key 100 is being carried, it transmits a signal to the vehicle 10 to lock the doors of the vehicle 10. The key lamp lights up based on a signal from the sound generating device 20.

[0021] As described above, the vehicle 10 used in the sound generation device 20 is configured as described. Next, the sound generation device 20 will be explained.

[0022] The sound generation device 20 comprises a generation unit 200 and a sound generation unit 220. The generation unit 200 is mainly composed of a microcontroller and includes a CPU, ROM, flash memory, RAM, I / O, communication interface, and bus lines connecting these components. The generation unit 200 also includes an energy sound generation unit 202, a consumable sound generation unit 204, and a key signal generation unit 206 as functional blocks.

[0023] The energy sound generation unit 202 executes a program stored in the ROM of the generation unit 200. As a result, the energy sound generation unit 202 generates a sound related to the remaining energy amount Me, based on the remaining energy amount Me. Furthermore, the energy sound generation unit 202 transmits a signal to generate this generated sound related to the remaining energy amount Me to the sound generation unit 220, which will be described later. Details of the processing of the energy sound generation unit 202 will be described later.

[0024] The consumable sound generation unit 204 executes a program stored in the ROM of the generation unit 200. This causes the consumable sound generation unit 204 to generate sounds related to the consumable parts of the vehicle 10, such as the tires, brake pads, and lights, based on the tire pressure Pt, brake pad usage time Tb, and light usage time Tc. The consumable sound generation unit 204 also transmits a signal to generate these generated sounds related to the consumable parts of the vehicle 10 to the sound generation unit 220, which will be described later. Details of the processing of the consumable sound generation unit 204 will be described later.

[0025] The key signal generation unit 206 executes a program stored in the ROM of the generation unit 200. This causes the key signal generation unit 206 to generate a signal to illuminate the electronic key 100 based on the remaining energy amount Me. Furthermore, the key signal generation unit 206 transmits this generated signal to illuminate the electronic key 100 to the electronic key 100. Details of the processing by the key signal generation unit 206 will be described later.

[0026] The sound-generating unit 220 is a speaker or the like. The sound-generating unit 220 also emits sounds related to the remaining energy amount Me based on a signal from the energy sound generation unit 202. Furthermore, the sound-generating unit 220 emits sounds related to the consumable parts of the vehicle 10, such as the tires, brake pads, and lights, based on a signal from the consumable part sound generation unit 204.

[0027] As described above, the sound generation device 20 is configured as described. Next, the processing by program execution of the energy sound generation unit 202 will be explained with reference to the flowchart in Figure 2. The program of the energy sound generation unit 202 is executed, for example, when the generation unit 200 receives a signal from the electronic key 100 to unlock the vehicle 10 or a signal to lock the vehicle.

[0028] In step S100, the energy sound generation unit 202 acquires information. Specifically, the energy sound generation unit 202 acquires the remaining energy amount Me from the energy remaining amount sensor 12.

[0029] In step S102, following step S100, the energy sound generation unit 202 determines whether the remaining energy amount Me obtained in step S100 is equal to or greater than the first energy threshold Me_th1. Based on this, the energy sound generation unit 202 determines whether the remaining energy amount Me is sufficient. The first energy threshold Me_th1 is set, for example, to 20% of the maximum energy capacity that the vehicle 10 can store, through experiments or simulations, so that it is determined whether the remaining energy amount Me is sufficient.

[0030] The energy sound generation unit 202 then determines that the remaining energy Me is insufficient when the remaining energy Me is less than the first energy threshold Me_th1. At this point, the energy sound generation unit 202 proceeds to step S108. The energy sound generation unit 202 also determines that the remaining energy Me is sufficient when the remaining energy Me is equal to or greater than the first energy threshold Me_th1. At this point, the energy sound generation unit 202 proceeds to step S104.

[0031] In step S104, following step S102, the energy sound generation unit 202 adjusts the amplitude, frequency, generation time, harmonic ratio, and the amount of change in amplitude when the sound is generated based on the remaining energy Me acquired in step S100. As a result, the energy sound generation unit 202 generates a sound that matches the remaining energy Me, thereby generating a sound related to the remaining energy Me.

[0032] For example, the energy sound generation unit 202 reduces the volume of the sound related to the remaining energy Me by decreasing the amplitude of the sound related to the remaining energy Me as the remaining energy Me increases. Furthermore, the energy sound generation unit 202 lowers the volume of the sound related to the remaining energy Me by decreasing the frequency of the sound related to the remaining energy Me as the remaining energy Me increases. In addition, the energy sound generation unit 202 shortens the generation time of the sound related to the remaining energy Me as the remaining energy Me increases. Furthermore, the energy sound generation unit 202 softens the sound related to the remaining energy Me by decreasing the ratio of harmonics of the sound related to the remaining energy Me and the amount of change in amplitude when the sound is generated as the remaining energy Me increases.

[0033] Furthermore, for example, the energy sound generation unit 202 may increase the volume of the sound related to the remaining energy Me by increasing the amplitude of the sound related to the remaining energy Me as the remaining energy Me increases. In addition, the energy sound generation unit 202 may increase the pitch of the sound related to the remaining energy Me by increasing the frequency of the sound related to the remaining energy Me as the remaining energy Me increases. Furthermore, the energy sound generation unit 202 may increase the duration of the sound related to the remaining energy Me as the remaining energy Me increases. Furthermore, the energy sound generation unit 202 may make the sound related to the remaining energy Me harder by increasing the ratio of harmonics of the sound related to the remaining energy Me and the amount of change in amplitude when the sound is generated as the remaining energy Me increases.

[0034] In step S106, following step S104, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 that generates a sound corresponding to the remaining energy amount Me generated in step S104. As a result, the sound generation unit 220 emits a sound corresponding to the remaining energy amount Me. Therefore, the driver and occupants of the vehicle 10 can know the remaining energy amount Me. After that, the processing of the energy sound generation unit 202 is completed.

[0035] In step S108, following step S102, if the remaining energy Me is less than the first energy threshold Me_th1, the energy sound generation unit 202 determines in step S100 whether the remaining energy Me is equal to or greater than the second energy threshold Me_th2. Based on this, the energy sound generation unit 202 determines whether there is a high probability that the remaining energy Me will become zero. The second energy threshold Me_th2 is set, for example, to 10% of the maximum energy capacity that the vehicle 10 can store, through experiments or simulations, etc., so that it is determined whether there is a high probability that the remaining energy Me will become zero.

[0036] The energy sound generation unit 202 then determines that there is a high probability that the remaining energy Me will become zero when the remaining energy Me is less than the second energy threshold Me_th2. At this point, the energy sound generation unit 202 proceeds to step S114. The energy sound generation unit 202 also determines that there is not a high probability that the remaining energy Me will become zero when the remaining energy Me is greater than or equal to the second energy threshold Me_th2. At this point, the energy sound generation unit 202 proceeds to step S110.

[0037] In step S110, following step S108, the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. Therefore, the energy sound generation unit 202 generates a first warning sound Sa1 to indicate that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2.

[0038] The first warning sound Sa1 includes a normal sound and a warning voice. The normal sound is, for example, an answer-back sound when the doors of the vehicle 10 are unlocked or locked. The warning voice included in the first warning sound Sa1 is, for example, a voice saying, "Energy remaining is 19%."

[0039] In step S112, following step S110, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 to generate the first warning sound Sa1 generated in step S110. As a result, the sound generation unit 220 emits the first warning sound Sa1. Therefore, the driver and occupants of the vehicle 10 can know that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. After that, the processing of the energy sound generation unit 202 is completed.

[0040] In step S114, following step S108, since the remaining energy Me is less than the second energy threshold Me_th2, there is a high probability that the remaining energy Me will become zero. For this reason, the energy sound generation unit 202 generates a second warning sound Sa2 to indicate that the remaining energy Me is less than the second energy threshold Me_th2.

[0041] The second warning sound Sa2 includes a warning sound and a warning voice. The warning sound included in the second warning sound Sa2 is a sound different from the normal sound, and it indicates that the remaining energy Me is less than the second energy threshold Me_th2, and that there is a high probability that the remaining energy Me will become zero. The warning voice included in the second warning sound Sa2 is, for example, a voice saying, "The remaining energy is 9%."

[0042] In step S116, following step S114, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 to generate the second warning sound Sa2 generated in step S114. As a result, the sound generation unit 220 emits the second warning sound Sa2. Therefore, the driver and occupants of the vehicle 10 can know that the remaining energy Me is less than the second energy threshold Me_th2. After that, the processing of the energy sound generation unit 202 is completed.

[0043] As described above, the energy sound generation unit 202 performs processing. Next, the processing by the consumable sound generation unit 204 due to program execution will be described with reference to the flowchart of FIG. 3. Note that the program of the consumable sound generation unit 204 is executed, for example, when the generation unit 200 receives a signal for unlocking the vehicle 10 from the electronic key 100 or a signal for locking the vehicle.

[0044] In step S200, the consumable sound generation unit 204 acquires various information. Specifically, the consumable sound generation unit 204 acquires the tire air pressure Pt from the tire air pressure sensor 14. Further, the consumable sound generation unit 204 acquires the brake pad usage time Tb from the brake pad sensor 16. Also, the consumable sound generation unit 204 acquires the light usage time Tc from the vehicle light sensor 18.

[0045] In step S202 following step S200, the consumable sound generation unit 204 determines whether it is necessary to replace the consumables of the vehicle 10 based on the tire air pressure Pt, the brake pad usage time Tb, and the light usage time Tc acquired in step S200.

[0046] Specifically, the consumable sound generation unit 204 determines whether the tire air pressure Pt acquired in step S200 is less than or equal to the air pressure threshold value Pt_th. The air pressure threshold value Pt_th is set by experiments, simulations, etc. so that the necessity of replacement for the tires of the vehicle 10 can be determined.

[0047] Furthermore, the consumable sound generation unit 204 determines whether the brake pad usage time Tb acquired in step S200 is greater than or equal to the brake pad threshold value Tb_th. The brake pad threshold value Tb_th is set by experiments, simulations, etc. so that the necessity of replacement for the brake pads of the vehicle 10 can be determined, for example.

[0048] Also, the consumable sound generation unit 204 determines whether the light usage time Tc acquired in step S200 is greater than or equal to the light threshold value Tc_th. The light threshold value Tc_th is set by experiments, simulations, etc. so that the necessity of replacement for the vehicle lights can be determined, for example.

[0049] Then, the tire pressure Pt is greater than the pressure threshold Pt_th, the brake pad usage time Tb is less than the brake pad threshold Tb_th, and the light usage time Tc is less than the light threshold Tc_th. At this point, the consumable sound generation unit 204 determines that replacement of the consumables of the vehicle 10 is unnecessary. After that, the processing of the consumable sound generation unit 204 ends.

[0050] Assume that the tire pressure Pt is less than or equal to the pressure threshold Pt_th, or the brake pad usage time Tb is greater than or equal to the brake pad threshold Tb_th, or the light usage time Tc is greater than or equal to the light threshold Tc_th. At this time, the consumable sound generation unit 204 determines that the consumables of the vehicle 10 need to be replaced. After that, the processing of the consumable sound generation unit 204 proceeds to step S204.

[0051] In step S204, following step S202, since the consumables of the vehicle 10 need to be replaced, the consumables sound generation unit 204 generates a consumables warning sound Sc to inform the user that the consumables of the vehicle 10 need to be replaced.

[0052] Specifically, the consumable sound generation unit 204 generates a consumable warning sound Sc when the tire pressure Pt is below the air pressure threshold Pt_th. This consumable warning sound Sc includes, for example, a warning sound as well as the voice message, "The tire pressure is low."

[0053] Furthermore, the consumable sound generation unit 204 generates a consumable warning sound Sc to indicate that the brake pad usage time Tb is equal to or greater than the brake pad threshold Tb_th when the brake pad usage time Tb is equal to or greater than the brake pad threshold Tb_th. This consumable warning sound Sc includes, for example, a warning sound as well as the voice message, "The brake pads are running low."

[0054] Furthermore, the consumable sound generation unit 204 generates a consumable warning sound Sc to indicate that the light usage time Tc is equal to or greater than the light threshold Tc_th when the light usage time Tc is equal to or greater than the light threshold Tc_th. This consumable warning sound Sc includes, for example, a warning sound as well as the voice message, "The light is running low."

[0055] In step S206, following step S204, the consumable sound generation unit 204 transmits a signal to the sound generation unit 220 to generate the consumable warning sound Sc generated in step S204. As a result, the sound generation unit 220 emits the consumable warning sound Sc. Therefore, the driver and occupants of the vehicle 10 can be informed that the consumables of the vehicle 10, such as the tires, brake pads, and vehicle lights, need to be replaced.

[0056] Here, a threshold smaller than the air pressure threshold Pt_th is used as the comparison tire threshold. The comparison tire threshold is set according to the lifespan of the vehicle 10's tires. The tire value is obtained by subtracting the comparison tire threshold from the tire air pressure Pt and dividing the result by the comparison tire threshold. The tire value decreases as the tire air pressure Pt decreases. Therefore, as the tire value decreases, the need to replace the vehicle 10's tires increases. A threshold larger than the brake pad threshold Tb_th is used as the comparison brake pad threshold. The comparison brake pad threshold is set according to the lifespan of the vehicle 10's brake pads. The brake pad value is obtained by subtracting the brake pad usage time Tb from the comparison brake pad threshold and dividing the result by the comparison brake pad threshold. The brake pad value decreases as the brake pad usage time Tb increases. Therefore, as the brake pad value decreases, the need to replace the vehicle 10's brake pads increases. A threshold larger than the light threshold Tc_th is used as the comparison light threshold. The comparison light threshold is set by the lifespan of the vehicle's headlights. The light value is obtained by subtracting the light usage time Tc from the comparison light threshold and dividing the result by the comparison light threshold. The light value decreases as the light usage time Tc increases. Therefore, as the light value decreases, the need to replace the vehicle's headlights increases.

[0057] Furthermore, here we assume that the tire pressure Pt is less than or equal to the pressure threshold Pt_th, the brake pad usage time Tb is greater than or equal to the brake pad threshold Tb_th, and the light usage time Tc is greater than or equal to the light threshold Tc_th.

[0058] In this case, the consumable sound generation unit 204 calculates the tire value from the tire pressure Pt obtained in step S100. The consumable sound generation unit 204 also calculates the brake pad value from the brake pad usage time Tb obtained in step S100. Furthermore, the consumable sound generation unit 204 calculates the light value from the light usage time Tc obtained in step S100. The consumable sound generation unit 204 also compares these calculated tire value, brake pad value, and light value. Furthermore, the consumable sound generation unit 204 generates corresponding consumable warning sounds Sc in order from smallest to largest, that is, from highest to lowest need for replacement.

[0059] For example, the tire value is smaller than the brake pad value, and the light value is larger than the brake pad value, i.e., tire value < brake pad value < light value. In this case, a consumable warning sound Sc related to tire air pressure Pt is generated, followed by a consumable warning sound Sc related to brake pad usage time Tb. Then, after a consumable warning sound Sc related to brake pad usage time Tb is generated, a consumable warning sound Sc related to light usage time Tc is generated. After that, the processing of the consumable sound generation unit 204 ends.

[0060] As described above, the consumable sound generation unit 204 performs the processing. Next, the processing by program execution of the key signal generation unit 206 will be explained with reference to the flowchart in Figure 4. The program of the key signal generation unit 206 is executed, for example, when the generation unit 200 receives a signal from the electronic key 100 to unlock the vehicle 10 or a signal to lock the vehicle.

[0061] In step S300, the key signal generation unit 206 acquires information. Specifically, the key signal generation unit 206 acquires the remaining energy amount Me from the energy remaining amount sensor 12.

[0062] In step S302, following step S300, the key signal generation unit 206 determines whether the remaining energy amount Me obtained in step S300 is equal to or greater than the first energy threshold Me_th1. Based on this, the key signal generation unit 206 determines whether the remaining energy amount Me is sufficient.

[0063] The key signal generation unit 206 then determines that the remaining energy Me is insufficient when the remaining energy Me is less than the first energy threshold Me_th1. At this point, the key signal generation unit 206 proceeds to step S306. Furthermore, the key signal generation unit 206 determines that the remaining energy Me is sufficient when the remaining energy Me is equal to or greater than the first energy threshold Me_th1. At this point, the key signal generation unit 206 proceeds to step S304.

[0064] In step S304, following step S302, the remaining energy Me is sufficient. At this time, the key signal generation unit 206 generates a first illumination signal Sb1. The first illumination signal Sb1 is a signal that causes the electronic key 100 to light up and indicates that the remaining energy Me is equal to or greater than the first energy threshold Me_th1. The key signal generation unit 206 also transmits this generated first illumination signal Sb1 to the electronic key 100.

[0065] As a result, the electronic key 100 emits, for example, a green light. This allows the driver and occupants of the vehicle 10 to know that the remaining energy Me is equal to or greater than the first energy threshold Me_th1. After that, the processing of the key signal generation unit 206 is completed.

[0066] In step S306, following step S302, if the remaining energy Me is less than the first energy threshold Me_th1, the key signal generation unit 206 determines in step S300 whether the remaining energy Me is greater than or equal to the second energy threshold Me_th2. Based on this, the key signal generation unit 206 determines whether there is a high probability that the remaining energy Me will become zero.

[0067] The key signal generation unit 206 then determines that there is a high probability that the remaining energy Me will become zero when the remaining energy Me is less than the second energy threshold Me_th2. At this point, the key signal generation unit 206 proceeds to step S310. Furthermore, the key signal generation unit 206 determines that there is not a high probability that the remaining energy Me will become zero when the remaining energy Me is greater than or equal to the second energy threshold Me_th2. At this point, the key signal generation unit 206 proceeds to step S308.

[0068] In step S308, following step S306, the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. At this time, the key signal generation unit 206 generates a second illumination signal Sb2. The second illumination signal Sb2 is a signal that causes the electronic key 100 to light up and indicates that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. The key signal generation unit 206 also transmits this generated second illumination signal Sb2 to the electronic key 100.

[0069] As a result, the electronic key 100 emits light of a different color than the light emitted by the electronic key 100 in response to the first illumination signal Sb1. For example, the electronic key 100 emits yellow light. Therefore, the driver and occupants of the vehicle 10 can know that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. After that, the processing of the key signal generation unit 206 is completed.

[0070] In step S310, following step S306, since the remaining energy Me is less than the second energy threshold Me_th2, there is a high probability that the remaining energy Me will become zero. At this time, the key signal generation unit 206 generates a third illumination signal Sb3. The third illumination signal Sb3 is a signal that causes the electronic key 100 to light up and indicates that the remaining energy Me is less than the second energy threshold Me_th2. Furthermore, the key signal generation unit 206 transmits this generated third illumination signal Sb3 to the electronic key 100.

[0071] As a result, the electronic key 100 emits light of a different color from the light emitted by the first illumination signal Sb1 and the second illumination signal Sb2. For example, the electronic key 100 emits red light. Therefore, the driver and occupants of the vehicle 10 can know that the remaining energy Me is less than the second energy threshold Me_th2. After that, the processing of the key signal generation unit 206 is completed.

[0072] As described above, the energy sound generation unit 202 performs the processing. Next, it will be explained that the sound generation device 20, which executes the sound generation program, allows the occupants of the vehicle 10, including the driver, to know the remaining energy amount Me of the vehicle 10 even if they are not in the vehicle 10.

[0073] The energy sound generation unit 202 of the sound generation device 20 plays the role of an acquisition unit that acquires a value related to the remaining energy amount Me in step S100 of the flowchart in Figure 2. Furthermore, in step S104, the energy sound generation unit 202 generates a sound related to the remaining energy amount Me by adjusting the amplitude, frequency, and generation time of the sound based on the remaining energy amount Me. In addition, the energy sound generation unit 202 plays the role of an energy sound generation unit that generates the generated sound.

[0074] As a result, the occupants of vehicle 10, including the driver, can sense the remaining energy level Me of vehicle 10 through sound. Therefore, the occupants of vehicle 10, including the driver, can know the remaining energy level Me of vehicle 10 even without being in vehicle 10.

[0075] Furthermore, the sound generation device 20 of the first embodiment also provides the following effects.

[0076] [1-1] The energy sound generation unit 202 adjusts the ratio of harmonics and the amount of change in amplitude when sound is generated based on a value relating to the remaining energy Me.

[0077] This adjusts the hardness and softness of the sound generated by the energy sound generation unit 202. As a result, it becomes easier to generate a sound that matches the remaining energy level Me. Therefore, the driver and occupants of the vehicle 10 can more easily know the remaining energy level Me.

[0078] [1-2] The energy sound generation unit 202 generates a sound related to the remaining energy Me when the remaining energy Me is equal to or greater than the first energy threshold Me_th1. Furthermore, the energy sound generation unit 202 generates a first warning sound Sa1 when the remaining energy Me is less than the first energy threshold Me_th1 and equal to or greater than the second energy threshold Me_th2. The first warning sound Sa1 corresponds to a sound that indicates that the value related to the remaining energy Me is less than the first energy threshold Me_th1 and equal to or greater than the second energy threshold Me_th2. Also, the energy sound generation unit 202 generates a second warning sound Sa2 when the remaining energy Me is less than the second energy threshold Me_th2. The second warning sound Sa2 corresponds to a sound that indicates that the remaining energy Me is less than the second energy threshold Me_th2.

[0079] This makes it easier for the driver and occupants of vehicle 10 to know the remaining energy level Me.

[0080] [1-3] The sound generation device 20 includes a consumable sound generation unit 204. In steps S202 and S204 of the flowchart in Figure 3, the consumable sound generation unit 204 generates a consumable warning sound Sc when the tire pressure Pt is less than or equal to the air pressure threshold Pt_th. Furthermore, the consumable sound generation unit 204 generates a consumable warning sound Sc when the brake pad usage time Tb is greater than or equal to the brake pad threshold Tb_th. Also, the consumable sound generation unit 204 generates a consumable warning sound Sc when the light usage time Tc is greater than or equal to the light threshold Tc_th. The consumable warning sound Sc corresponds to a sound that indicates that the value related to the tire pressure Pt is less than or equal to the air pressure threshold Pt_th. Furthermore, the consumable warning sound Sc corresponds to a sound that indicates that the value related to the brake pad usage time Tb is greater than or equal to the brake pad threshold Tb_th. Furthermore, the consumable warning sound Sc corresponds to a sound that indicates that the value related to the light usage time Tc is greater than or equal to the light threshold Tc_th. In addition, the consumable sound generation unit 204 plays the role of a consumable sound generation unit that generates the generated sound.

[0081] This allows the driver and occupants of vehicle 10 to know when consumables such as the tires, brake pads, and vehicle lights of vehicle 10 need to be replaced.

[0082] [1-4] The sound generation device 20 includes a key signal generation unit 206. In steps S304, S308, and S310 of the flowchart in Figure 4, the key signal generation unit 206 generates a signal to cause the electronic key 100 related to the vehicle 10 to light up. Furthermore, when the remaining energy amount Me is greater than or equal to the first energy threshold Me_th1, the key signal generation unit 206 transmits a first lighting signal Sb1 to the electronic key 100 in step S304 to cause the electronic key 100 to light up. In addition, when the remaining energy amount Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2, the key signal generation unit 206 transmits a second lighting signal Sb2 to the electronic key 100 in step S308. The second lighting signal Sb2 causes the electronic key 100 to emit light of a different color than the light emitted by the electronic key 100 due to the first lighting signal Sb1. Furthermore, when the remaining energy Me is less than the second energy threshold Me_th2, the key signal generation unit 206 transmits a third illumination signal Sb3 to the electronic key 100 in step S310. The third illumination signal Sb3 causes the electronic key 100 to emit light of a different color from the light emitted by the first illumination signal Sb1 and the second illumination signal Sb2.

[0083] This allows the driver and occupants of vehicle 10 to perceive the vehicle's remaining energy level Me through light. Therefore, it becomes easier for the driver and occupants of vehicle 10 to know the remaining energy level Me.

[0084] (Second Embodiment) In the second embodiment, as shown in Figure 5, the vehicle 10 further includes a sound collection unit 30. In addition, the sound generation unit 200 of the sound generation device 20 includes, as functional blocks, a sound pressure analysis unit 208, a frequency analysis unit 210, a period analysis unit 212, and an adjustment sound setting unit 214, in addition to the energy sound generation unit 202, the consumable sound generation unit 204, and the key signal generation unit 206. Furthermore, the processing of the energy sound generation unit 202 and the consumable sound generation unit 204 differs from that of the first embodiment. Other than these, it is the same as the first embodiment.

[0085] The sound collection unit 30 is a microphone array or the like, and has multiple microphones arranged in a row. As a result, the sound collection unit 30 collects sound from the outside of the vehicle 10. The sound collection unit 30 also outputs the data of the collected sound to the sound generation device 20.

[0086] The sound pressure analysis unit 208 executes a program stored in the ROM of the generation unit 200. This allows the sound pressure analysis unit 208 to analyze the sound pressure outside the vehicle 10 from the sound data collected by the sound collection unit 30. Details of the processing by the sound pressure analysis unit 208 will be described later.

[0087] The frequency analysis unit 210 executes a program stored in the ROM of the generation unit 200. This allows the frequency analysis unit 210 to analyze the sound frequencies outside the vehicle 10 from the sound data collected by the sound collection unit 30. Details of the processing performed by the frequency analysis unit 210 will be described later.

[0088] The period analysis unit 212 executes a program stored in the ROM of the generation unit 200. This allows the period analysis unit 212 to analyze the period of sound outside the vehicle 10 from the sound data collected by the sound collection unit 30. Details of the processing by the period analysis unit 212 will be described later.

[0089] The sound adjustment setting unit 214 executes a program stored in the ROM of the generation unit 200. Based on the analysis results of the sound pressure analysis unit 208, frequency analysis unit 210, and period analysis unit 212, the sound adjustment setting unit 214 sets a sound that is easily audible even in the presence of background noise. Details of the processing of the sound adjustment setting unit 214 will be described later.

[0090] As described above, the vehicle 10 and sound generation device 20 in the second embodiment are configured as shown. Next, the processing by program execution of the sound pressure analysis unit 208 will be explained with reference to the flowchart in Figure 6. The program of the sound pressure analysis unit 208 is executed, for example, when the generation unit 200 receives a signal from the electronic key 100 to unlock the vehicle 10 or a signal to lock the vehicle.

[0091] In step S400, the sound pressure analysis unit 208 acquires information. Specifically, the sound pressure analysis unit 208 acquires sound data from the sound collection unit 30 that is outside the vehicle 10.

[0092] In step S402, following step S400, the sound pressure analysis unit 208 calculates a moving average over time for the sound pressure of the sound data acquired in step S400. This smooths the sound pressure values ​​of the sound data over time. Furthermore, the sound pressure analysis unit 208 extracts the maximum sound pressure from the moving averaged sound pressure. This analyzes the sound pressure outside the vehicle 10.

[0093] In step S404, following step S402, the sound pressure analysis unit 208 sets a sound pressure higher than the maximum sound pressure extracted in step S402. This sets the sound pressure level at which sounds are easily audible even in the presence of background noise. The sound pressure analysis unit 208 also stores this set sound pressure level in the flash memory of the generation unit 200. As a result, the sound pressure level at which sounds are easily audible even in the presence of background noise is stored in the flash memory of the generation unit 200. After this, the processing of the sound pressure analysis unit 208 is completed.

[0094] As described above, the sound pressure analysis unit 208 performs the processing. Next, the processing by program execution of the frequency analysis unit 210 will be explained with reference to the flowchart in Figure 7. The program of the frequency analysis unit 210 is executed, for example, when the generation unit 200 receives a signal from the electronic key 100 to unlock the vehicle 10 or a signal to lock the vehicle.

[0095] In step S500, the frequency analysis unit 210 acquires information. Specifically, the frequency analysis unit 210 acquires sound data from the sound collection unit 30 from the outside of the vehicle 10.

[0096] In step S502, following step S500, the frequency analysis unit 210 calculates the frequency characteristics of the sound outside the vehicle 10 by performing a Fourier transform and the like on the sound data acquired in step S500. Furthermore, the frequency analysis unit 210 performs peak detection on this calculated frequency characteristics. The frequency analysis unit 210 also extracts the peak frequency from the detected peak value. In this way, the frequency of the sound outside the vehicle 10 is analyzed. The peak frequency is the frequency corresponding to the peak value.

[0097] In step S504, following step S502, the frequency analysis unit 210 sets a frequency different from the peak frequency extracted in step S502. This sets a frequency of sound that is easily audible even in the presence of background noise. Furthermore, the frequency analysis unit 210 stores this set frequency, along with the peak frequency extracted in step S502, in the flash memory of the generation unit 200. As a result, the frequencies of sound that are easily audible even in the presence of background noise and the frequencies of sound that are difficult to hear due to background noise are stored in the flash memory of the generation unit 200. After that, the processing of the frequency analysis unit 210 ends.

[0098] As described above, the frequency analysis unit 210 performs the processing. Next, the processing by program execution of the period analysis unit 212 will be explained with reference to the flowchart in Figure 8. The program of the period analysis unit 212 is executed, for example, when the generation unit 200 receives a signal from the electronic key 100 to unlock the vehicle 10 or a signal to lock the vehicle.

[0099] In step S600, the periodic analysis unit 212 acquires information. Specifically, the periodic analysis unit 212 acquires sound data from the sound collection unit 30 on the outside of the vehicle 10.

[0100] In step S602, following step S600, the period analysis unit 212 detects periodic sounds by performing frequency analysis such as a Fourier transform on the sound data acquired in step S600. This allows the period of the sound outside the vehicle 10 to be analyzed.

[0101] In step S604, following step S602, the periodic analysis unit 212 sets a phase different from the phase of the periodic sound detected in step S602. This allows the periodic analysis unit 212 to set a phase of sound that is easily audible even in the presence of background noise. The periodic analysis unit 212 also stores this set phase and the phase of the periodic sound detected in step S602 in the flash memory of the generation unit 200. As a result, the phase of sound that is easily audible even in the presence of background noise and the phase of sound that is difficult to hear due to background noise are stored in the flash memory of the generation unit 200. After that, the processing of the periodic analysis unit 212 ends.

[0102] As described above, the periodic analysis unit 212 performs the processing. Next, the processing by program execution of the sound adjustment setting unit 214 will be explained with reference to the flowchart in Figure 9. The program of the sound adjustment setting unit 214 is executed, for example, when the processing of the sound pressure analysis unit 208, frequency analysis unit 210, and periodic analysis unit 212 is completed.

[0103] In step S700, the sound adjustment setting unit 214 acquires various information. Specifically, the sound adjustment setting unit 214 reads the sound pressure of sounds that are easily audible even in the presence of background noise, as set by the sound pressure analysis unit 208, from the flash memory of the generation unit 200. Furthermore, the sound adjustment setting unit 214 reads the frequency of sounds that are easily audible even in the presence of background noise, as set by the frequency analysis unit 210, from the flash memory of the generation unit 200. In addition, the sound adjustment setting unit 214 reads the phase of sounds that are easily audible even in the presence of background noise, as set by the period analysis unit 212, from the flash memory of the generation unit 200.

[0104] In step S702, following step S700, the sound adjustment unit 214 sets a sound that is easily audible even in the presence of background noise, based on the sound pressure, frequency, and phase read in step S700. Furthermore, the sound adjustment unit 214 stores this set sound in the flash memory of the generation unit 200. As a result, a sound that is easily audible even in the presence of background noise is stored in the flash memory of the generation unit 200. After that, the processing of the sound adjustment unit 214 is completed.

[0105] As described above, the adjustment sound setting unit 214 performs the processing. Next, the processing by program execution of the energy sound generation unit 202 will be explained with reference to the flowchart in Figure 10.

[0106] In step S100, the energy sound generation unit 202 obtains the remaining energy amount Me from the energy remaining amount sensor 12. In addition, the energy sound generation unit 202 reads from the flash memory of the generation unit 200 to obtain a sound that is easily audible even in the presence of background noise, which is set in the adjustment sound setting unit 214.

[0107] The processes in steps S102, S104, S108, S110, and S114 following step S100 are carried out in the same manner as in the first embodiment.

[0108] In step S120, following step S104, the energy sound generation unit 202 adjusts the sound to match the remaining energy Me generated in step S104, using the sound that is easily audible even with background noise acquired in step S100.

[0109] Specifically, the energy sound generation unit 202 increases the sound pressure of the sound generated in step S104, which is matched to the remaining energy Me, to a level greater than the sound pressure outside the vehicle 10. Furthermore, the energy sound generation unit 202 changes the frequency of the sound generated in step S104, which is matched to the remaining energy Me, to a frequency different from the peak frequency of the sound outside the vehicle 10. In addition, the energy sound generation unit 202 changes the phase of the sound generated in step S104, which is matched to the remaining energy Me, to a phase different from the phase of the sound outside the vehicle 10.

[0110] In step S106, following step S120, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 that generates a sound corresponding to the remaining energy amount Me adjusted in step S120. As a result, the sound generation unit 220 emits a sound that is easily audible even in the presence of background noise and that is corresponding to the remaining energy amount Me. Therefore, the driver and occupants of the vehicle 10 can easily know the remaining energy amount Me. After that, the processing of the energy sound generation unit 202 is completed.

[0111] In step S122, following step S110, the energy sound generation unit 202 adjusts the first warning sound Sa1 generated in step S110 using a sound that is easily audible even in the presence of background noise, which was acquired in step S100.

[0112] Specifically, the energy sound generation unit 202 increases the sound pressure of the first warning sound Sa1 generated in step S110 to a level greater than the sound pressure of the sound outside the vehicle 10. Furthermore, the energy sound generation unit 202 changes the frequency of the first warning sound Sa1 generated in step S110 to a frequency different from the peak frequency of the sound outside the vehicle 10. Additionally, the energy sound generation unit 202 changes the phase of the first warning sound Sa1 generated in step S110 to a phase different from the phase of the sound outside the vehicle 10.

[0113] In step S112, following step S122, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 to generate the first warning sound Sa1 adjusted in step S122. As a result, the sound generation unit 220 emits the first warning sound Sa1, which is easily audible even in the presence of background noise. This makes it easier for the driver and occupants of the vehicle 10 to know that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. After that, the processing of the energy sound generation unit 202 is completed.

[0114] In step S124, following step S114, the energy sound generation unit 202 adjusts the second warning sound Sa2 generated in step S114 using the sound acquired in step S100 that is easily audible even in the presence of background noise.

[0115] Specifically, the energy sound generation unit 202 increases the sound pressure of the second warning sound Sa2 generated in step S114 to a level greater than the sound pressure of the sound outside the vehicle 10. Furthermore, the energy sound generation unit 202 changes the frequency of the second warning sound Sa2 generated in step S114 to a frequency different from the peak frequency of the sound outside the vehicle 10. Additionally, the energy sound generation unit 202 changes the phase of the second warning sound Sa2 generated in step S114 to a phase different from the phase of the sound outside the vehicle 10.

[0116] In step S116, following step S124, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 to generate the second warning sound Sa2 adjusted in step S124. As a result, the sound generation unit 220 emits the second warning sound Sa2, which is easily audible even in the presence of background noise. This makes it easier for the driver and occupants of the vehicle 10 to know that the remaining energy Me is less than the second energy threshold Me_th2. After that, the processing of the energy sound generation unit 202 is completed.

[0117] As described above, the energy sound generation unit 202 performs the processing. Next, the processing by program execution of the consumable sound generation unit 204 will be explained with reference to the flowchart in Figure 11.

[0118] In step S200, the consumable sound generation unit 204 obtains tire pressure Pt, brake pad usage time Tb, and light usage time Tc from the corresponding sensors. In addition, the consumable sound generation unit 204 reads from the flash memory of the generation unit 200 to obtain a sound that is easily audible even in the presence of ambient noise, which is set in the adjustment sound setting unit 214.

[0119] The processes in steps S202 and S204 following step S200 are carried out in the same manner as in the first embodiment.

[0120] In step S210, following step S204, the consumable sound generation unit 204 adjusts the consumable warning sound Sc generated in step S204 using a sound that is easily audible even in the presence of background noise, which was acquired in step S200.

[0121] Specifically, the consumable sound generation unit 204 increases the sound pressure of the consumable warning sound Sc generated in step S204 to be greater than the sound pressure of the sound outside the vehicle 10. Furthermore, the consumable sound generation unit 204 changes the frequency of the consumable warning sound Sc generated in step S204 to a frequency different from the peak frequency of the sound outside the vehicle 10. In addition, the consumable sound generation unit 204 changes the phase of the consumable warning sound Sc generated in step S204 to a phase different from the phase of the sound outside the vehicle 10.

[0122] In step S206, following step S210, the consumable sound generation unit 204 transmits a signal to the sound generation unit 220 to generate the consumable warning sound Sc adjusted in step S210. As a result, the sound generation unit 220 emits a consumable warning sound Sc that is easily audible even in the presence of ambient noise. This makes it easier for the driver and occupants of the vehicle 10 to know that the consumables of the vehicle 10, such as the tires, brake pads, and vehicle lights, need to be replaced. After that, the processing of the consumable sound generation unit 204 is completed.

[0123] As described above, the vehicle 10 and sound generation device 20 in the second embodiment are configured, and the sound pressure analysis unit 208, frequency analysis unit 210, period analysis unit 212, adjustment sound setting unit 214, energy sound generation unit 202, and consumable sound generation unit 204 perform processing. This second embodiment also produces the same effects as the first embodiment. Furthermore, the second embodiment also produces the effects described below.

[0124] [2-1] The energy sound generation unit 202 plays the role of an energy sound adjustment unit that adjusts the generated sound based on the sound outside the vehicle 10 in steps S120, S122, and S124 of the flowchart in Figure 10. Specifically, the energy sound generation unit 202 makes the sound pressure of the generated sound greater than the sound pressure of the sound outside the vehicle 10. Furthermore, the energy sound generation unit 202 changes the frequency of the generated sound to a frequency different from the peak frequency of the sound outside the vehicle 10. In addition, the energy sound generation unit 202 changes the phase of the generated sound to a phase different from the phase of the sound outside the vehicle 10.

[0125] As a result, the sound generated by the energy sound generation unit 202 is easily audible even in the presence of background noise. Therefore, the driver and occupants of the vehicle 10 can more easily ascertain the remaining energy level Me.

[0126] [2-2] In step S210 of the flowchart in Figure 11, the consumable sound generation unit 204 acts as a consumable sound adjustment unit, adjusting the generated consumable warning sound Sc based on the sound outside the vehicle 10. Specifically, the consumable sound generation unit 204 increases the sound pressure of the generated consumable warning sound Sc to be greater than the sound pressure of the sound outside the vehicle 10. Furthermore, the consumable sound generation unit 204 changes the frequency of the generated consumable warning sound Sc to a frequency different from the peak frequency of the sound outside the vehicle 10. In addition, the consumable sound generation unit 204 changes the phase of the generated consumable warning sound Sc to a phase different from the phase of the sound outside the vehicle 10.

[0127] As a result, the consumable warning sound Sc generated by the consumable sound generation unit 204 is easily audible even in the presence of ambient noise. This makes it easier for the driver and occupants of the vehicle 10 to be aware that the consumables of the vehicle 10, such as the tires, brake pads, and vehicle lights, need to be replaced.

[0128] (Third Embodiment) In the third embodiment, as shown in Figure 12, the vehicle 10 further includes a GNSS receiver 40. In addition, the sound generation device 20 includes a user setting unit 240 in addition to the generation unit 200 and the sound generation unit 220. Furthermore, the processing of the energy sound generation unit 202 and the consumable sound generation unit 204 differs from that of the second embodiment. Other than these, it is the same as the second embodiment.

[0129] The GNSS receiver 40 receives signals from multiple positioning satellites (not shown). Based on these received signals, the GNSS receiver 40 acquires time information and calculates the location of the vehicle 10. Furthermore, the GNSS receiver 40 transmits a signal corresponding to the calculated location of the vehicle 10 to the sound generator 20. The positioning satellites used in the GNSS receiver 40 include, for example, GPS satellites, GLONASS satellites, Galileo satellites, and quasi-zenith satellites.

[0130] The user setting unit 240 is, for example, a UI, which is a user operation screen. When the user setting unit 240 is operated, the time and location are set. Furthermore, when the user of the sound generation device 20 operates the user setting unit 240, the volume of the sound emitted by the sound generation unit 220 is set when the current time is the time set by the user, or when the location of the vehicle 10 is the location set by the user. In addition, when the user operates the user setting unit 240, it is set which volume takes precedence: the volume when the current time is the time set by the user, or the volume when the location of the vehicle 10 is the location set by the user. These set times, locations, volumes, and priority levels are stored in the flash memory of the generation unit 200. Note that UI stands for User Interface. Users of the sound generation device 20 include the driver, passengers, and people involved with the dealer of the vehicle 10.

[0131] As described above, the vehicle 10 and sound generation device 20 in the third embodiment are configured as described. Next, the processing by program execution of the energy sound generation unit 202 will be explained with reference to the flowcharts in Figures 13, 14, 15, and 16.

[0132] In step S100 of the flowchart in Figure 13, the energy sound generation unit 202 acquires the remaining energy Me and a sound that is easily audible even in the presence of background noise. In addition, the energy sound generation unit 202 acquires the location of the vehicle 10 from the GNSS receiver 40. Furthermore, the energy sound generation unit 202 acquires the time, location, volume, and priority set in the user setting unit 240 by reading the flash memory of the generation unit 200.

[0133] The processes in steps S102, S104, S108, S110, and S114 following step S100 are carried out in the same manner as in the second embodiment.

[0134] In step S130, following step S104, the energy sound generation unit 202 determines whether or not the user-defined conditions are met. The user-defined conditions are met when the current time is the time set by the user, or when the location of the vehicle 10 is the location set by the user.

[0135] Therefore, the current time is not the time obtained in step S100, and the location of the vehicle 10 obtained in step S100 is not the location set in the user setting unit 240. At this time, the energy sound generation unit 202 determines that the user setting conditions are not met. After that, the processing of the energy sound generation unit 202 proceeds to step S120. The processing in step S120 is performed in the same manner as in the second embodiment.

[0136] Furthermore, the current time is the time obtained in step S100, or the location of the vehicle 10 obtained in step S100 is the location set in the user setting unit 240. At this time, the energy sound generation unit 202 determines that the user setting condition is met. After that, the processing of the energy sound generation unit 202 proceeds to step S132.

[0137] As shown in the flowchart of Figure 14, in step S132 following step S130, the energy sound generation unit 202 uses the volume and priority set by the user, which were acquired in step S100. As a result, the energy sound generation unit 202 changes the volume of the sound to match the remaining energy Me generated in step S104.

[0138] For example, suppose the current time is the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is not the location set in the user setting unit 240. In this case, the energy sound generation unit 202 changes the volume of the sound corresponding to the remaining energy Me generated in step S104 to the time-specific volume. The time-specific volume is the volume set in the user setting unit 240 when the current time is the time set by the user.

[0139] Furthermore, for example, suppose the current time is not the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is the location set in the user setting unit 240. In this case, the energy sound generation unit 202 changes the volume of the sound corresponding to the remaining energy Me generated in step S104 to the location-specific volume. The location-specific volume is the volume set in the user setting unit 240 when the location of the vehicle 10 is the location set by the user.

[0140] Furthermore, for example, suppose the current time is the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is the location set in the user setting unit 240. In this case, if the priority of the time-based volume is set higher than the priority of the location-based volume, the energy sound generation unit 202 changes the volume of the sound corresponding to the remaining energy Me generated in step S104 to the time-based volume. Also, in this case, if the priority of the location-based volume is set higher than the priority of the time-based volume, the energy sound generation unit 202 changes the volume of the sound corresponding to the remaining energy Me generated in step S104 to the location-based volume.

[0141] Furthermore, the energy sound generation unit 202 uses a sound that is easily audible even in the presence of background noise, acquired in step S100, to change the frequency and phase of the sound to match the remaining energy Me generated in step S104.

[0142] Specifically, the energy sound generation unit 202 changes the frequency of the sound corresponding to the remaining energy Me generated in step S104 to a frequency different from the peak frequency of the sound outside the vehicle 10. Furthermore, the energy sound generation unit 202 changes the phase of the sound corresponding to the remaining energy Me generated in step S104 to a phase different from the phase of the sound outside the vehicle 10. After that, the processing of the energy sound generation unit 202 proceeds to step S106.

[0143] Returning to the flowchart in Figure 13, in step S106 following step S132, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 that generates a sound that matches the remaining energy amount Me, whose volume, frequency, and phase were changed in step S132. As a result, the sound generation unit 220 emits a sound that matches the remaining energy amount Me, whose volume, frequency, and phase have been changed. The volume was changed in step S132. Therefore, for example, the driver and occupants of vehicle 10 can be informed about the remaining energy amount Me by reducing the volume at times when they do not want the volume to be loud, such as at night. Furthermore, for example, the driver and occupants of vehicle 10 can be informed about the remaining energy amount Me by reducing the volume at locations when they do not want the volume to be loud, such as near their homes. In addition, because the frequency and phase were changed in step S132, the sound emitted by the sound generation unit 220 is easily audible even in the presence of background noise. Therefore, it becomes easier for the driver and occupants of vehicle 10 to be informed about the remaining energy amount Me. After that, the processing of the energy sound generation unit 202 is terminated.

[0144] In step S140, following step S110, the energy sound generation unit 202 determines whether the user-defined condition is met, similar to the process in step S130. If the user-defined condition is not met, the energy sound generation unit 202 proceeds to step S122. The process in step S122 is performed in the same manner as in the second embodiment. If the user-defined condition is met, the energy sound generation unit 202 proceeds to step S142.

[0145] As shown in the flowchart of Figure 15, in step S142 following step S140, the energy sound generation unit 202 uses the volume and priority set by the user, which were acquired in step S100. As a result, the energy sound generation unit 202 changes the volume of the first warning sound Sa1 generated in step S110.

[0146] For example, suppose the current time is the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is not the location set in the user setting unit 240. In this case, the energy sound generation unit 202 changes the volume of the first warning sound Sa1 generated in step S110 to the time-specific volume.

[0147] Furthermore, for example, suppose the current time is not the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is the location set in the user setting unit 240. In this case, the energy sound generation unit 202 changes the volume of the first warning sound Sa1 generated in step S110 to a location-specific volume.

[0148] Furthermore, for example, suppose the current time is the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is the location set in the user setting unit 240. In this case, if the priority of the time-based volume is set higher than the priority of the location-based volume, the energy sound generation unit 202 changes the volume of the first warning sound Sa1 generated in step S110 to the time-based volume. Also, in this case, if the priority of the location-based volume is set higher than the priority of the time-based volume, the energy sound generation unit 202 changes the volume of the first warning sound Sa1 generated in step S110 to the location-based volume.

[0149] Furthermore, the energy sound generation unit 202 modifies the frequency and phase of the first warning sound Sa1 generated in step S110 using a sound that is easily audible even in the presence of background noise, which was acquired in step S100.

[0150] Specifically, the energy sound generation unit 202 changes the frequency of the first warning sound Sa1 generated in step S110 to a frequency different from the peak frequency of sound outside the vehicle 10. Furthermore, the energy sound generation unit 202 changes the phase of the first warning sound Sa1 generated in step S110 to a phase different from the phase of sound outside the vehicle 10. After that, the processing of the energy sound generation unit 202 proceeds to step S112.

[0151] Returning to the flowchart in Figure 13, in step S112 following step S142, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 to generate a first warning sound Sa1 whose volume, frequency, and phase have been changed in step S142. As a result, the sound generation unit 220 emits the first warning sound Sa1 whose volume, frequency, and phase have been changed. The volume has been changed in step S142. Therefore, for example, the driver and occupants of the vehicle 10 can know that the volume has decreased at times when they do not want the volume to be loud, such as in the middle of the night, and that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. Furthermore, for example, the driver and occupants of the vehicle 10 can know that the volume has decreased at times when they do not want the volume to be loud, such as near their home, and that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. Furthermore, since the frequency and phase are changed in step S142, the sound emitted by the sound-generating unit 220 is easily audible even in the presence of background noise. As a result, the driver and occupants of the vehicle 10 can easily know that the remaining energy Me is less than the first energy threshold Me_th1 and greater than or equal to the second energy threshold Me_th2. After that, the processing of the energy sound generation unit 202 is completed.

[0152] In step S150, following step S114, the energy sound generation unit 202 determines whether the user-defined conditions are met, similar to the processing in steps S130 and S140. If the user-defined conditions are not met, the energy sound generation unit 202 proceeds to step S124. The processing in step S124 is performed in the same manner as in the second embodiment. If the user-defined conditions are met, the energy sound generation unit 202 proceeds to step S152.

[0153] As shown in the flowchart of Figure 16, in step S152 following step S150, the energy sound generation unit 202 uses the volume and priority set by the user, which were acquired in step S100. As a result, the energy sound generation unit 202 changes the volume of the second warning sound Sa2 generated in step S114.

[0154] For example, suppose the current time is the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is not the location set in the user setting unit 240. In this case, the energy sound generation unit 202 changes the volume of the second warning sound Sa2 generated in step S114 to the time-specific volume.

[0155] Furthermore, for example, suppose the current time is not the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is the location set in the user setting unit 240. In this case, the energy sound generation unit 202 changes the volume of the second warning sound Sa2 generated in step S114 to a location-specific volume.

[0156] Furthermore, for example, suppose the current time is the time acquired in step S100, and the location of the vehicle 10 acquired in step S100 is the location set in the user setting unit 240. In this case, if the priority of the time-based volume is set higher than the priority of the location-based volume, the energy sound generation unit 202 changes the volume of the second warning sound Sa2 generated in step S114 to the time-based volume. Also, in this case, if the priority of the location-based volume is set higher than the priority of the time-based volume, the energy sound generation unit 202 changes the volume of the second warning sound Sa2 generated in step S114 to the location-based volume.

[0157] Furthermore, the energy sound generation unit 202 uses the sound acquired in step S100, which is easily audible even in the presence of background noise, to change the frequency and phase of the second warning sound Sa2 generated in step S114.

[0158] Specifically, the energy sound generation unit 202 changes the frequency of the second warning sound Sa2 generated in step S114 to a frequency different from the peak frequency of the sound outside the vehicle 10. Furthermore, the energy sound generation unit 202 changes the phase of the second warning sound Sa2 generated in step S114 to a phase different from the phase of the sound outside the vehicle 10. After that, the processing of the energy sound generation unit 202 proceeds to step S116.

[0159] Returning to the flowchart in Figure 13, in step S116 following step S152, the energy sound generation unit 202 transmits a signal to the sound generation unit 220 to generate a second warning sound Sa2 whose volume, frequency, and phase were changed in step S152. As a result, the sound generation unit 220 emits the second warning sound Sa2 with changed volume, frequency, and phase. The volume was changed in step S152. Therefore, for example, the driver and occupants of the vehicle 10 can know that the volume has decreased and that the remaining energy Me is below the second energy threshold Me_th2 at times when they do not want the volume to be loud, such as in the middle of the night. Furthermore, for example, the driver and occupants of the vehicle 10 can know that the volume has decreased and that the remaining energy Me is below the second energy threshold Me_th2 at times when they do not want the volume to be loud, such as near their home. In addition, since the frequency and phase were changed in step S152, the sound emitted by the sound generation unit 220 is easily audible even in the presence of background noise. Therefore, the driver and occupants of vehicle 10 can easily know that the remaining energy Me is less than the second energy threshold Me_th2. After that, the processing of the energy sound generation unit 202 is completed.

[0160] As described above, the energy sound generation unit 202 performs the processing. Next, the processing by program execution of the consumable sound generation unit 204 will be explained with reference to the flowchart in Figure 17.

[0161] In step S200, the consumable sound generation unit 204 acquires tire pressure Pt, brake pad usage time Tb, light usage time Tc, and sounds that are easily audible even in the presence of ambient noise. In addition, the consumable sound generation unit 204 acquires the location of the vehicle 10 from the GNSS receiver 40. Furthermore, the consumable sound generation unit 204 acquires the time, location, volume, and priority set in the user setting unit 240 by reading the flash memory of the generation unit 200.

[0162] The processes in steps S202 and S204 following step S200 are carried out in the same manner as in the second embodiment.

[0163] In step S220, following step S204, the consumable sound generation unit 204 determines whether the user-defined conditions are met. If the user-defined conditions are not met, the consumable sound generation unit 204 proceeds to step S210. The processing in step S210 is performed in the same manner as in the second embodiment. Furthermore, if the user-defined conditions are met, the consumable sound generation unit 204 proceeds to step S222.

[0164] In step S222, following step S220, the consumable sound generation unit 204 uses the volume and priority set by the user, which were acquired in step S200. As a result, the consumable sound generation unit 204 changes the volume of the consumable warning sound Sc generated in step S204.

[0165] For example, suppose the current time is the time acquired in step S200, and the location of the vehicle 10 acquired in step S200 is not the location set in the user setting unit 240. In this case, the consumable sound generation unit 204 changes the volume of the consumable warning sound Sc generated in step S204 to the volume for the time.

[0166] Furthermore, for example, suppose the current time is not the time acquired in step S200, and the location of the vehicle 10 acquired in step S200 is the location set in the user setting unit 240. In this case, the consumable sound generation unit 204 changes the volume of the consumable warning sound Sc generated in step S204 to a location-specific volume.

[0167] Furthermore, for example, suppose the current time is the time acquired in step S200, and the location of the vehicle 10 acquired in step S200 is the location set in the user setting unit 240. In this case, if the priority of the time volume is set higher than the priority of the location volume, the consumable sound generation unit 204 changes the volume of the consumable warning sound Sc generated in step S204 to the time volume. Also, in this case, if the priority of the location volume is set higher than the priority of the time volume, the consumable sound generation unit 204 changes the volume of the consumable warning sound Sc generated in step S204 to the location volume.

[0168] Furthermore, the consumable sound generation unit 204 modifies the frequency and phase of the consumable warning sound Sc generated in step S204 using a sound that is easily audible even in the presence of background noise, which was acquired in step S200.

[0169] Specifically, the consumable sound generation unit 204 changes the frequency of the consumable warning sound Sc generated in step S204 to a frequency different from the peak frequency of the sound outside the vehicle 10. Furthermore, the consumable sound generation unit 204 changes the phase of the consumable warning sound Sc generated in step S204 to a phase different from the phase of the sound outside the vehicle 10. After that, the processing of the consumable sound generation unit 204 proceeds to step S206.

[0170] In step S206, following step S222, the consumable sound generation unit 204 transmits a signal to the sound generation unit 220 to generate a consumable warning sound Sc whose volume, frequency, and phase were changed in step S222. As a result, the sound generation unit 220 emits a consumable warning sound Sc whose volume, frequency, and phase have been changed. The volume was changed in step S222. Therefore, for example, the driver and occupants of vehicle 10 can hear the sound decrease at times when they do not want the volume to be loud, such as at night, and be aware that the consumables of vehicle 10, such as the tires, brake pads, and vehicle lights, need to be replaced. Furthermore, for example, the driver and occupants of vehicle 10 can hear the sound decrease at times when they do not want the volume to be loud, such as near their home, and be aware that the consumables of vehicle 10, such as the tires, brake pads, and vehicle lights, need to be replaced. In addition, because the frequency and phase were changed in step S222, the sound emitted by the sound generation unit 220 is easily audible even in the presence of ambient noise. Therefore, the driver and occupants of vehicle 10 will be more easily informed that the consumables of vehicle 10, such as the tires, brake pads, and vehicle lights, need to be replaced. After that, the processing of the consumable sound generation unit 204 is completed.

[0171] As described above, the vehicle 10 and sound generation device 20 in the third embodiment are configured, and the energy sound generation unit 202 and the consumable sound generation unit 204 perform processing. This third embodiment also provides the same effects as the second embodiment. Furthermore, the third embodiment also provides the effects described below.

[0172] [3-1] The energy sound generation unit 202 acts as a time-dependent energy volume adjustment unit, which changes the volume of the generated sound to the volume set by the user when the current time is the time set by the user.

[0173] This allows, for example, the driver and occupants of vehicle 10 to know the remaining energy Me by reducing the volume at times when they do not want the volume to be loud, such as in the middle of the night.

[0174] [3-2] The energy sound generation unit 202 acts as a location-specific energy sound volume adjustment unit, which changes the volume of the generated sound to a volume set by the user when the location of the vehicle 10 is a location set by the user.

[0175] This allows, for example, the driver and occupants of vehicle 10 to know the remaining energy Me when the volume is reduced in places where they do not want the volume to be loud, such as near their homes.

[0176] [3-3] The consumable sound generation unit 204 acts as a time-based consumable volume adjustment unit, which, when the current time is the time set by the user, changes the volume of the generated consumable warning sound Sc to the volume set by the user.

[0177] This allows, for example, the driver and occupants of vehicle 10 to know that the volume has decreased and that consumables such as the tires, brake pads, and vehicle lights of vehicle 10 need to be replaced, at times when they do not want the volume to be loud, such as in the middle of the night.

[0178] [3-4] The consumable sound generation unit 204 acts as a location-specific consumable sound volume adjustment unit, which changes the volume of the generated consumable warning sound Sc to the volume set by the user when the location of the vehicle 10 is a location set by the user.

[0179] This allows, for example, the driver and passengers of vehicle 10 to know that the noise level has decreased in places where they do not want the noise level to be high, such as near their homes, and that consumables such as the tires, brake pads, and vehicle lights of vehicle 10 need to be replaced.

[0180] (Other Embodiments) This disclosure is not limited to the embodiments described above, and modifications can be made to these embodiments as appropriate. Furthermore, it goes without saying that, in each of the embodiments described above, the elements constituting the embodiment are not necessarily essential, except in cases where they are explicitly stated to be particularly essential or where they are clearly essential in principle.

[0181] The sound generation apparatus and method described herein may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the sound generation apparatus and method described herein may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the sound generation apparatus and method described herein may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium.

[0182] In each of the above embodiments, the energy sound generation unit 202 generates a sound that matches the remaining energy Me when the remaining energy Me is equal to or greater than the first energy threshold Me_th1 in steps S102 and S104. Alternatively, the energy sound generation unit 202 may generate a sound that matches the remaining energy Me when the remaining energy Me is less than the first energy threshold Me_th1.

[0183] The above embodiments may be combined as appropriate.

[0184] (Perspectives of this Disclosure) [Perspective 1] A sound generating device used in a vehicle (10), comprising: an acquisition unit (202) that acquires a value relating to the remaining energy (Me) of the vehicle; an energy sound generation unit (202) that generates a sound relating to the remaining energy by adjusting the amplitude, frequency and generation time of the sound based on the value relating to the remaining energy; and an energy sound generation unit (202) that generates the sound generated by the energy sound generation unit. [Perspective 2] The sound generating device according to Perspective 1, wherein the energy sound generation unit adjusts the ratio of harmonics based on the value relating to the remaining energy. [Perspective 3] The sound generating device according to Perspective 1 or 2, wherein the energy sound generation unit adjusts the amount of change in amplitude when sound is generated based on the value relating to the remaining energy. [Perspective 4] The sound generating device according to any one of Perspectives 1 to 3, wherein the energy sound generation unit generates a sound relating to the remaining energy by adjusting the amplitude, frequency and generation time of the sound based on the value relating to the remaining energy when the value relating to the remaining energy is equal to or greater than an energy threshold (Me_th1). [Perspective 5] The sound generating device according to Perspective 4, wherein the energy threshold is a first energy threshold, and the energy sound generating unit generates a sound (Sa1) to indicate that the value of the remaining energy is less than the first energy threshold and greater than or equal to the second energy threshold (Me_th2) which is smaller than the first energy threshold when the value of the remaining energy is less than the first energy threshold and greater than or equal to the second energy threshold, and generates a sound (Sa2) to indicate that the value of the remaining energy is less than the second energy threshold when the value of the remaining energy is less than the second energy threshold.[Perspective 6] The sound generating device further comprises a key signal generating unit (206) that generates a signal to cause an electronic key (100) relating to the vehicle to emit light, wherein the key signal generating unit transmits a first lighting signal (Sb1) to the electronic key to cause the electronic key to emit light when the value relating to the remaining energy is equal to or greater than the first energy threshold, transmits a second lighting signal (Sb2) to the electronic key to cause the electronic key to emit light of a different color from the color emitted by the electronic key due to the first lighting signal when the value relating to the remaining energy is less than the first energy threshold and equal to or greater than the second energy threshold, and transmits a third lighting signal (Sb3) to the electronic key to cause the electronic key to emit light of a different color from the color emitted by the electronic key due to the first lighting signal and the second lighting signal when the value relating to the remaining energy is less than the second energy threshold. [Perspective 7] The sound generating device further comprises an energy sound adjustment unit (202) that adjusts the sound generated by the energy sound generating unit based on the sound outside the vehicle, wherein the energy sound adjustment unit increases the sound pressure of the sound generated by the energy sound generating unit to be greater than the sound pressure of the sound outside the vehicle, changes the frequency of the sound generated by the energy sound generating unit to a frequency different from the peak frequency of the sound outside the vehicle, and changes the phase of the sound generated by the energy sound generating unit to a phase different from the phase of the sound outside the vehicle, as described in any one of Perspectives 1 to 6. [Perspective 8] The sound generating device further comprises a time energy volume adjustment unit (202) that changes the volume of the sound generated by the energy sound generating unit to a volume set by the user when the current time is a time set by the user, as described in any one of Perspectives 1 to 7. [Perspective 9] The sound generation device according to any one of Perspectives 1 to 8, further comprising a location-based energy volume adjustment unit (202) that changes the volume of the sound generated by the energy sound generation unit to a volume set by the user when the location of the vehicle is a location set by the user.[Perspective 10] The sound generating device further comprises: a consumable sound generating unit (204) that generates a sound (Sc) indicating that the value of the tire pressure (Pt) of the vehicle is less than or equal to the tire pressure threshold (Pt_th) when the value of the tire pressure is less than or equal to the tire pressure threshold (Pt_th); and a consumable sound generating unit (204) that generates the sound generated by the consumable sound generating unit. [Perspective 11] The sound generating device according to Perspective 10, wherein the consumable sound generating unit generates a sound (Sc) indicating that the value of the brake pad usage time (Tb) of the vehicle is greater than or equal to the brake pad threshold (Tb_th) when the value of the brake pad usage time is greater than or equal to the brake pad threshold (Tb_th). [Perspective 12] The sound generating device according to Perspective 10 or 11, wherein the consumable sound generating unit generates a sound (Sc) indicating that the value of the light usage time (Tc) of the vehicle is greater than or equal to the light threshold (Tc_th) when the value of the light usage time (Tc) of the vehicle is greater than or equal to the light threshold (Tc_th). [Perspective 13] The sound generating device further comprises a consumable sound adjustment unit (204) that adjusts the sound (Sc) generated by the consumable sound generating unit based on the sound outside the vehicle, wherein the consumable sound adjustment unit increases the sound pressure of the sound generated by the consumable sound generating unit to be greater than the sound pressure of the sound outside the vehicle, changes the frequency of the sound generated by the consumable sound generating unit to a frequency different from the peak frequency of the sound outside the vehicle, and changes the phase of the sound generated by the consumable sound generating unit to a phase different from the phase of the sound outside the vehicle, as described in any one of Perspectives 10 to 12. [Perspective 14] The sound generating device further comprises a time-dependent consumable volume adjustment unit (204) that changes the volume of the sound generated by the consumable sound generating unit to a volume set by the user when the current time is a time set by the user, as described in any one of Perspectives 10 to 13.[Perspective 15] The sound generating device according to any one of Perspectives 10 to 14, further comprising a location-based consumable volume adjustment unit (204) that changes the volume of the sound generated by the consumable volume generation unit to a volume set by the user when the location of the vehicle is a location set by the user. [Perspective 16] A sound generating program that causes a sound generating device used in a vehicle (10) to function as an acquisition unit (202) that acquires a value relating to the remaining energy (Me) of the vehicle, an energy sound generation unit (202) that generates a sound relating to the remaining energy by adjusting the amplitude, frequency and generation time of the sound based on the value relating to the remaining energy, and an energy sound generation unit (202) that generates the sound generated by the energy sound generation unit.

Claims

1. A sound generating device used in a vehicle (10), comprising: an acquisition unit (202) that acquires a value relating to the remaining energy (Me) of the vehicle; an energy sound generating unit (202) that generates a sound relating to the remaining energy by adjusting the amplitude, frequency and generation time of the sound based on the value relating to the remaining energy; and an energy sound generating unit (202) that generates the sound generated by the energy sound generating unit.

2. The sound generating device according to claim 1, wherein the energy sound generating unit adjusts the harmonic ratio based on the value relating to the remaining energy.

3. The sound generating device according to claim 1, wherein the energy sound generating unit adjusts the amount of change in amplitude when sound is generated based on the value relating to the remaining energy.

4. The sound generating device according to claim 1, wherein the energy sound generating unit generates a sound related to the remaining energy by adjusting the amplitude, frequency, and generation time of the sound based on the value related to the remaining energy when the value related to the remaining energy is equal to or greater than the energy threshold (Me_th1).

5. The sound generating device according to claim 4, wherein the energy threshold is a first energy threshold, and the energy sound generating unit generates a sound (Sa1) to indicate that the value of the remaining energy is less than the first energy threshold and greater than or equal to the second energy threshold (Me_th2) which is smaller than the first energy threshold when the value of the remaining energy is less than the first energy threshold and greater than or equal to the second energy threshold, and generates a sound (Sa2) to indicate that the value of the remaining energy is less than the second energy threshold when the value of the remaining energy is less than the second energy threshold.

6. The sound generating device further comprises a key signal generating unit (206) that generates a signal to cause an electronic key (100) relating to the vehicle to emit light, wherein the key signal generating unit transmits a first lighting signal (Sb1) to the electronic key to cause the electronic key to emit light when the value relating to the remaining energy is equal to or greater than the first energy threshold, transmits a second lighting signal (Sb2) to the electronic key to cause the electronic key to emit light of a different color from the color emitted by the electronic key due to the first lighting signal when the value relating to the remaining energy is less than the first energy threshold and equal to or greater than the second energy threshold, and transmits a third lighting signal (Sb3) to the electronic key to cause the electronic key to emit light of a different color from the color emitted by the electronic key due to the first lighting signal and the second lighting signal when the value relating to the remaining energy is less than the second energy threshold.

7. The sound generating device further comprises an energy sound adjustment unit (202) that adjusts the sound generated by the energy sound generating unit based on the sound outside the vehicle, wherein the energy sound adjustment unit increases the sound pressure of the sound generated by the energy sound generating unit to be greater than the sound pressure of the sound outside the vehicle, changes the frequency of the sound generated by the energy sound generating unit to a frequency different from the peak frequency of the sound outside the vehicle, and changes the phase of the sound generated by the energy sound generating unit to a phase different from the phase of the sound outside the vehicle, as described in claim 1.

8. The sound generation device according to claim 1, further comprising a time-dependent energy volume adjustment unit (202) that, when the current time is a time set by the user, changes the volume of the sound generated by the energy sound generation unit to a volume set by the user.

9. The sound generation device according to claim 1, further comprising a location energy volume adjustment unit (202) that changes the volume of the sound generated by the energy sound generation unit to a volume set by the user when the location of the vehicle is a location set by the user.

10. The sound generating device according to any one of claims 1 to 9, further comprising: a consumable sound generating unit (204) that generates a sound (Sc) indicating that the value of the tire pressure (Pt) of the vehicle is less than or equal to the tire pressure threshold (Pt_th); and a consumable sound generating unit (204) that generates the sound generated by the consumable sound generating unit.

11. The sound generating device according to claim 10, wherein the consumable sound generating unit generates a sound (Sc) that indicates that the value relating to the brake pad usage time (Tb) of the vehicle is equal to or greater than the brake pad threshold (Tb_th).

12. The sound generating device according to claim 10, wherein the consumable sound generating unit generates a sound (Sc) that indicates that the value relating to the vehicle's light usage time (Tc) is equal to or greater than the light threshold (Tc_th).

13. The sound generating device further comprises a consumable sound adjustment unit (204) that adjusts the sound (Sc) generated by the consumable sound generating unit based on the sound outside the vehicle, wherein the consumable sound adjustment unit increases the sound pressure of the sound generated by the consumable sound generating unit to be greater than the sound pressure of the sound outside the vehicle, changes the frequency of the sound generated by the consumable sound generating unit to a frequency different from the peak frequency of the sound outside the vehicle, and changes the phase of the sound generated by the consumable sound generating unit to a phase different from the phase of the sound outside the vehicle, as described in claim 10.

14. The sound generation device according to claim 10, further comprising a time-based consumable volume adjustment unit (204) that, when the current time is a time set by the user, changes the volume of the sound generated by the consumable volume generation unit to a volume set by the user.

15. The sound generation device according to claim 10, further comprising a location-based consumable volume adjustment unit (204) that changes the volume of the sound generated by the consumable sound generation unit to a volume set by the user when the location of the vehicle is a location set by the user.

16. A sound generation program that causes a sound generation device used in a vehicle (10) to function as an acquisition unit (202) that acquires a value relating to the remaining energy (Me) of the vehicle, an energy sound generation unit (202) that generates a sound relating to the remaining energy by adjusting the amplitude, frequency and generation time of the sound based on the value relating to the remaining energy, and an energy sound generation unit (202) that generates the sound generated by the energy sound generation unit.

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