Apparatus and method for outputting sound of vehicle

Abstract

This invention relates to an apparatus and method for outputting sound from a vehicle. Specifically, the vehicle sound output apparatus may include: a sensor, a storage device, and a controller, wherein the sensor senses the vehicle's speed and the rotational speed of a drive motor; the storage device stores antiphase sound sources corresponding to the rotational speed of the drive motor; and when the vehicle's speed exceeds a predetermined speed, the controller causes the output of an antiphase sound source corresponding to the rotational speed of the drive motor from the antiphase sound sources stored in the storage device.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2021-0013350, filed with the Korean Intellectual Property Office on January 29, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to apparatus and method for outputting sound from a vehicle. Background Technology

[0004] Electric vehicles (EVs) produce virtually no noise, such as engine noise, because they are driven by electric motors, not internal combustion engines. Therefore, to enable pedestrians to perceive a moving vehicle, a virtual engine sound system (VESS) that outputs a virtual engine sound can be installed in the EV.

[0005] On the other hand, when electric vehicles travel at high speeds, the components involved in driving them can generate various noises, such as motor noise, reducer noise, or switching noise. This noise is quieter than engine noise but can cause discomfort to passengers. Therefore, there is a need to develop a technology to reduce the noise generated by electric vehicle components located within electric vehicles. Summary of the Invention

[0006] One aspect of the present invention provides an apparatus and method for outputting the sound of a vehicle, which is capable of reducing noise generated by certain components in an electric vehicle.

[0007] The technical problems solved by the present invention are not limited to those mentioned above, and any other technical problems not mentioned herein will be clearly understood by those skilled in the art through the following description.

[0008] According to one aspect of the present invention, a vehicle sound output device may include: a sensor, a storage device, and a controller, wherein the sensor senses the vehicle's driving speed and the rotational speed of a drive motor; the storage device stores anti-phase sound sources of noise corresponding to the rotational speed of the drive motor; and when the vehicle's driving speed exceeds a predetermined speed, the controller causes the output of an anti-phase sound source corresponding to the rotational speed of the drive motor from the anti-phase sound sources stored in the storage device.

[0009] The controller can perform a Fast Fourier Transform (FFT) on the noise based on the rotational speed of the drive motor and obtain the frequency information of the noise.

[0010] The controller can track the specific order of noise reduction based on the frequency information of the noise and the speed of the drive motor.

[0011] The rating can represent the number of events that cause noise per unit rotation of the drive motor.

[0012] The controller can convert a specific level of noise, tracked based on the rotational speed of the drive motor, into time data.

[0013] The controller can generate an antiphase noise source of a specific level to be converted into time data, and can control the storage device to store the time data.

[0014] The controller can acquire and store pre-generated anti-phase sound sources in response to a predetermined cumulative driving distance.

[0015] When the vehicle's cumulative driving distance is the predetermined cumulative driving distance, the controller can update the anti-phase sound source stored in the storage device to a pre-generated anti-phase sound source based on the cumulative driving distance.

[0016] According to one aspect of the present invention, a method for outputting the sound of a vehicle may include: storing, using a storage device, antiphase sound sources of noise based on the rotational speed of a drive motor of the vehicle; sensing the vehicle's driving speed using a sensor, and when the vehicle's driving speed exceeds a predetermined speed, sensing the rotational speed of the drive motor using a sensor; and using a controller to output the antiphase sound sources stored in the antiphase sound source that correspond to the sensed rotational speed of the drive motor.

[0017] The storage of the anti-phase sound source can further include performing an FFT on the noise based on the rotational speed of the drive motor to obtain the frequency information of the noise.

[0018] The storage of the anti-phase sound source can further include noise-based frequency information to track specific levels of noise reduction based on the rotational speed of the drive motor.

[0019] The rating can represent the number of events that cause noise per unit rotation of the drive motor.

[0020] The storage of the anti-phase sound source can further include converting a specific level of noise, tracked according to the rotational speed of the drive motor, into time data.

[0021] The storage of antiphase sound sources can include antiphase sound sources that generate a specific level of noise to be converted into time data.

[0022] The method may further include acquiring and storing a pre-generated anti-phase sound source in response to a predetermined cumulative driving distance.

[0023] The method may further include updating the stored anti-phase sound source to a pre-generated anti-phase sound source based on the cumulative driving distance when the cumulative driving distance of the vehicle is a predetermined cumulative driving distance. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings:

[0025] Figure 1 A schematic diagram illustrating a vehicle sound output device according to an embodiment of the present invention;

[0026] Figure 2 To illustrate the FFT-transformed noise profile in a vehicle according to an embodiment of the present invention;

[0027] Figure 3 To illustrate the frequency response curve of a specific level of noise based on motor speed tracking according to an embodiment of the present invention;

[0028] Figure 4 A schematic diagram illustrating the result of matching a specific level of noise to motor revolutions in accordance with an embodiment of the present invention, which is to be converted into time data.

[0029] Figure 5 This is an inverted schematic diagram illustrating the result of matching a specific level of noise to motor speed, which is to be converted into time data according to an embodiment of the present invention;

[0030] Figure 6 A flowchart illustrating a method for generating an antiphase sound source according to an embodiment of the present invention;

[0031] Figure 7 A flowchart illustrating a vehicle sound output method according to an embodiment of the present invention;

[0032] Figure 8 A flowchart illustrating a vehicle sound output method according to another embodiment of the present invention. Detailed Implementation

[0033] It should be understood that the term "vehicle" or "of a vehicle" or other similar terms as used herein generally include motor vehicles, such as passenger cars including sport utility vehicles (SUVs), buses, trucks, and various commercial vehicles, vessels including various boats and ships, aircraft, etc., and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., vehicles derived from non-petroleum fuels). As mentioned herein, a hybrid vehicle is a vehicle with two or more power sources, such as a vehicle powered by both gasoline and electricity.

[0034] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” and “described” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, values, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, values, steps, operations, elements, components, and / or groups thereof. As used herein, the term “and / or” includes any and all combinations of one or more related enumerations. Throughout the specification, unless expressly stated otherwise, the word “comprising” and variations such as “including” or “including” will be understood to imply the inclusion of the stated elements, but do not exclude any other elements. Furthermore, the terms “unit,” “device,” “component,” and “module” described in the specification mean a unit for performing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

[0035] Furthermore, the control logic of the present invention can be implemented as a non-transitory computer-readable medium on a computer-readable medium, which contains executable program instructions that are executed by a processor, controller, etc. Examples of computer-readable media include, but are not limited to, ROM, RAM, optical disc (CD)-ROM, magnetic tape, floppy disk, flash memory drive, smart card, and optical data storage device. The computer-readable medium can also be distributed on a network-connected computer system, such that the computer-readable medium is stored and executed in a distributed manner, for example, via a telematics server or a controller area network (CAN).

[0036] In the following, exemplary embodiments of the invention will be described in detail with reference to the accompanying drawings. When adding reference numerals to the components of each drawing, it should be noted that even if the same components are shown in other drawings, they have the same reference numerals. In describing embodiments of the invention, detailed descriptions relating to well-known functions or configurations will be omitted where such descriptions would unnecessarily obscure the subject matter of the invention.

[0037] In describing elements of exemplary embodiments of the present invention, the terms first, second, A, B, (a), (b), etc., may be used herein. These terms are used only to distinguish one element from another and do not limit the corresponding elements, regardless of their nature, order, or priority. Furthermore, unless otherwise defined, all terms used herein (including technical and scientific terms) are to be interpreted as having their usual meaning in the field to which this invention pertains. It should be understood that the terms used herein should be interpreted as having meaning consistent with their meaning in the context of the present invention and related fields, and should not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0038] Figure 1 This is a schematic diagram illustrating a sound output device for a vehicle according to an embodiment of the present invention.

[0039] like Figure 1 As shown, the vehicle sound output device 100 according to an embodiment of the present invention may include: a sensor 110, a storage device 120, a drive motor 130, an output device 140, and a controller 150.

[0040] Sensor 110 can sense vehicle driving information. This driving information may include the vehicle's speed and the rotational speed of the drive motor 130. According to an embodiment, sensor 110 may include a vehicle speed sensor and a Hall effect sensor.

[0041] Storage device 120 may store at least one algorithm for calculating or executing various commands to operate the sound output device of the vehicle according to an embodiment of the present invention. Storage device 120 may store a reverse-phase sound source based on the rotational speed of the drive motor 130. Furthermore, storage device 120 may store a reverse-phase sound source updated based on the vehicle's cumulative mileage. Storage device 120 may include at least one storage medium such as flash memory, hard disk, memory card, read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, or optical disk.

[0042] The drive motor 130 can be a device that provides power to the drive shaft of an electric vehicle, and can drive the vehicle by transmitting appropriate torque to the wheels when a reducer is connected to the shaft of the drive motor 130. The drive motor 130 can operate by receiving power from an inverter that converts the direct current (DC) power from the battery into alternating current (AC) power.

[0043] The output device 140 may include a speaker that outputs a virtual engine sound or an inverse sound source of vehicle noise generated by the controller 150.

[0044] The controller 150 can be implemented by various processing devices, such as a microprocessor equipped with a semiconductor chip capable of executing or running various commands, and the controller 150 can control the operation of the sound output device of the vehicle according to an embodiment of the present invention. Specifically, when the vehicle's speed exceeds a predetermined speed, the controller 150 can cause the output of the anti-phase sound source corresponding to the sensed motor speed from the anti-phase sound sources stored in the storage device 120.

[0045] First, the controller 150 can store the inverse noise source based on the rotational speed of the drive motor 130. The controller 150 can determine whether the vehicle's speed exceeds a predetermined speed. According to an embodiment of the present invention, the controller 150 can determine whether the vehicle's speed exceeds 30 km / h.

[0046] When it is determined that the vehicle's speed exceeds the predetermined speed, the controller 150 can detect the rotation speed of the drive motor 130.

[0047] Furthermore, the controller 150 can obtain the noise of the drive motor 130, the noise of the reducer, and the noise of the inverter generated when the drive motor 130 rotates. According to an embodiment of the present invention, the controller 150 can separate the noise of the drive motor 130, the noise of the reducer, and the noise of the inverter generated when the drive motor 130 rotates according to the rotational speed of the drive motor 130, and can obtain the separated noise.

[0048] The controller 150 can acquire and store frequency information of the noise generated by the drive motor 130, the reducer noise, and the inverter noise when the drive motor 130 rotates. According to the embodiment, the controller 150 can perform a Fast Fourier Transform (FFT) on the noise of the drive motor 130, the reducer noise, and the inverter noise based on the rotational speed of the drive motor 130, and can convert the transformed noise based on the rotational speed of the drive motor 130 into frequency information. (Refer to...) Figure 2 A more detailed description is provided.

[0049] Figure 2 To illustrate the noise curve after FFT transformation in a vehicle according to an embodiment of the present invention.

[0050] The controller 150 can perform an FFT on the noise generated by the drive motor 130 during rotation, the noise from the reducer, and the noise from the inverter, and as follows: Figure 2As shown, frequency information for each of the drive motor noise, reducer noise, and inverter noise can be obtained based on the rotational speed of the drive motor 130. Here, the controller 150 obtains the frequency information based on the drive motor rotational speed for the purpose of extracting only the specific noise to be reduced (cancelled) based on the obtained frequency information. A more detailed explanation of the operation of extracting specific noise will refer to [reference needed]. Figure 3 Describe it.

[0051] Figure 3 To illustrate the frequency curve of a specific order of noise based on motor speed tracking according to an embodiment of the present invention.

[0052] like Figure 2 As shown, the controller 150 can extract a specific level of noise to be reduced based on the frequency information converted from noise by the rotational speed of the drive motor, and can track the frequency based on the motor rotational speed of the specific noise level. Here, the level can represent the number of events that cause noise per unit rotation of the drive motor. According to an embodiment of the invention, when a component (a component associated with the drive motor (e.g., a pump, gears, etc.)) causes noise by repeatedly contacting or vibrating while the drive motor is rotating, it is preferably understood that the level is the number of times the component repeatedly contacts or vibrates. For example, when the drive motor is rotating, the sound generated when gears collide with each other occurs 48 times, the sound generated when gears collide with each other causes noise. Therefore, it is preferably understood that the sound generated when gears collide with each other is noise with a level of 48.

[0053] When reducing noise to level 48, the controller 150 can extract the noise level 48 based on the frequency information of the noise, and can track the frequency information of the noise level 48 according to the motor speed (level tracking).

[0054] When tracking frequency information of a specific level of noise (e.g., noise level 48) to be reduced based on motor speed, controller 150 can convert the frequency information into time data. Here, time data can refer to real-time data. According to an embodiment, controller 150 can convert the frequency information of a specific level of noise (e.g., noise level 48) based on motor speed into time data by utilizing LMS audio playback and filtering.

[0055] Here, the controller 150 converts the frequency information of a specific level of noise based on the motor rotation speed into time data in order to convert the frequency information into sound source data that can be substantially perceived by passengers. This is because the frequency information of a specific level of noise based on the motor rotation speed is not sound source data that can be substantially perceived by passengers. Therefore, when the frequency information of a specific level of noise is converted into time data based on the motor rotation speed, the controller 150 can separate the specific level of noise from the various noises generated when the drive motor rotates, and then make the separated noise perceptible to the vehicle passengers.

[0056] The controller 150 can match a specific level of noise to be converted into time data based on the rotational speed of the drive motor. According to the implementation scheme, the sound source waveform of the matching result can be as follows: Figure 4 As shown. Figure 4 This is a schematic diagram illustrating the result of matching a specific level of noise to motor speeds, which is to be converted into time data according to an embodiment of the present invention.

[0057] To reduce noise at a specific level that needs to be converted into sound source (time data) perceptible to vehicle passengers, controller 150 can generate an anti-phase sound source (time data) with a specific level of noise matching the motor rotation speed. Furthermore, controller 150 can store the anti-phase sound source in storage device 120. According to the embodiment, the waveform of the anti-phase sound source can be as follows: Figure 5 The graph is shown below. Figure 5 This is a reverse-phase schematic diagram illustrating the result of matching a specific level of noise to motor speed, which is to be converted into time data according to an embodiment of the present invention.

[0058] After storing the anti-phase sound source generated as described above in the storage device 120, the controller 150 can detect the driving speed and the rotation speed of the drive motor in real time. When the vehicle's driving speed exceeds a predetermined speed, the controller 150 can output the anti-phase sound source corresponding to the sensed rotation speed of the drive motor from the anti-phase sound sources pre-stored in the storage device 120.

[0059] According to the implementation scheme, the controller 150 can output the anti-phase sound source (with) stored in the storage device 120 that corresponds to the real-time detected rotation speed of the drive motor through the output device 140. Figure 5 (The waveform of the antiphase sound source). According to an embodiment of the invention, when the antiphase sound source is output through the output device 140, the antiphase sound source cancels out the noise to be reduced (a specific level of noise) in the noise generated by the rotation of the drive motor. Therefore, according to an embodiment of the invention, the controller 150 can enable vehicle passengers to perceive a significant reduction in a specific level of noise and can provide a quiet and comfortable in-vehicle environment for vehicle passengers.

[0060] Meanwhile, since durability changes with the vehicle's cumulative mileage, the noise generated by the rotation of the drive motor also changes. Accordingly, according to an embodiment of the invention, the controller 150 can acquire and store a pre-generated anti-phase sound source in response to a predetermined cumulative mileage. According to the embodiment, during the vehicle development phase, in response to a predetermined cumulative mileage, an anti-phase sound source based on the noise generated by the rotation of the drive motor of another vehicle (which is of the same type as the vehicle of the present invention) can be pre-generated and stored. For example, during the vehicle development phase, another vehicle (which is of the same type as the vehicle of the present invention) can generate and store an anti-phase sound source when the cumulative mileage is 10,000 km, when the cumulative mileage is 20,000 km, and when the cumulative mileage is 100,000 km.

[0061] The controller 150 can obtain and store a pre-generated anti-phase sound source from another vehicle of the same type as the vehicle of the present invention. When the actual cumulative driving distance of the vehicle of the present invention becomes a predetermined cumulative driving distance, the controller 150 can update the anti-phase sound source stored in the storage device 120 with a pre-generated anti-phase sound source based on the cumulative driving distance.

[0062] According to the embodiment, when the cumulative driving distance of the vehicle of the present invention reaches 10,000 km, the controller 150 can update the pre-stored anti-phase sound source to a pre-generated anti-phase sound source when the cumulative driving distance reaches 10,000 km. When the cumulative driving distance of the vehicle of the present invention reaches 20,000 km, the controller 150 can update the pre-stored anti-phase sound source to a pre-generated anti-phase sound source when the cumulative driving distance reaches 20,000 km. Here, the anti-phase sound source pre-generated by another vehicle (which is of the same type as the vehicle of the present invention) can be generated by the operation of the controller 150 according to the embodiment of the present invention.

[0063] In this way, even when the noise generated in the vehicle changes due to the decrease in durability as the cumulative driving distance increases, the controller 150 can provide a quiet in-vehicle environment for the vehicle passengers by outputting an anti-phase sound source corresponding to the changed noise.

[0064] Figure 6 A flowchart illustrating a method for generating an antiphase sound source according to an embodiment of the present invention is provided.

[0065] like Figure 6 As shown, the controller 150 can obtain the vehicle's travel speed (S110). The controller 150 can determine whether the vehicle's travel speed exceeds a predetermined speed (S120). According to the embodiment, the controller 150 can determine in step S120 whether the vehicle's travel speed exceeds 30 km / h.

[0066] When it is determined in step S120 that the vehicle's speed exceeds a predetermined speed, the controller 150 can detect the rotational speed of the drive motor 130 (S130). When it is determined in step S120 that the vehicle's speed does not exceed the predetermined speed (No), the controller 150 terminates without generating a reverse-phase sound source.

[0067] Furthermore, in step S130, the controller 150 can obtain the noise of the drive motor 130, the noise of the reducer, and the noise of the inverter generated when the drive motor 130 rotates. According to an embodiment of the present invention, the controller 150 can separate the noise of the drive motor 130, the noise of the reducer, and the noise of the inverter generated when the drive motor 130 rotates according to the rotational speed of the drive motor 130, and can obtain the separated noise.

[0068] The controller 150 can acquire and store frequency information for each of the noise generated by the drive motor 130, the reducer, and the inverter when the drive motor 130 rotates (S140). According to the embodiment, in step S140, the controller 150 can perform an FFT on the noise of the drive motor 130, the reducer, and the inverter based on the rotational speed of the drive motor 130, and can convert the transformed noise based on the rotational speed of the drive motor 130 into frequency information.

[0069] In order to extract only the specific noise to be reduced (cancelled) based on the obtained frequency information in step S140, the controller 150 can extract the specific level of noise to be reduced and can track the frequency of the specific level of noise according to the motor speed (S150).

[0070] In step S150, the level can represent the number of events, each event causing noise per unit rotation of the motor. According to an embodiment of the invention, when components (components associated with the drive motor, such as pumps, gears, etc.) repeatedly contact or vibrate during motor rotation, causing noise, it is preferably understood that the level is the number of times the components repeatedly contact or vibrate. For example, when the drive motor rotates, the sound generated when gears collide occurs 48 times, the sound generated when gears collide causes noise. Therefore, it is preferably understood that the sound generated when gears collide is noise level 48. When reducing noise level 48, the controller 150 can extract noise level 48 based on noise frequency information and can track the frequency information of noise level 48 according to motor rotation speed (level tracking).

[0071] When tracking frequency information of a specific level of noise to be reduced based on motor rotation speed (e.g., noise level 48), controller 150 can convert the frequency information into time data (S160). In step S160, the time data can refer to real-time data. According to an embodiment, controller 150 can convert the frequency information of a specific level of noise (e.g., noise level 48) based on motor rotation speed into time data by utilizing LMS audio playback and filtering. In step S160, controller 150 converts the frequency information of the specific level of noise based on motor rotation speed into time data in order to convert the frequency information into sound source data that can be substantially perceived by passengers, since the frequency information of the specific level of noise based on motor rotation speed is not sound source data that can be substantially perceived by passengers. Therefore, when converting the frequency information of the specific level of noise based on motor rotation speed into time data, controller 150 can separate the specific level of noise from the various noises generated when the drive motor rotates, and then make the separated noise perceptible to vehicle passengers.

[0072] The controller 150 can match the specific level of noise to be converted into time data based on the rotational speed of the drive motor (S170).

[0073] When a specific level of noise matches the rotational speed of the drive motor in step S170, the controller 150 can generate an inverse sound source (time data) of the specific level of noise that matches the rotational speed of the motor, in order to reduce the noise of the specific level that needs to be converted into a sound source (time data) that can be perceived by the vehicle passengers (S180).

[0074] Figure 7 A flowchart illustrating a vehicle sound output method according to an embodiment of the present invention.

[0075] like Figure 7 As shown, the controller 150 can obtain the vehicle's travel speed (S210). The controller 150 can determine whether the vehicle's travel speed exceeds a predetermined speed (S220). According to the embodiment, in step S220, the controller 150 can determine whether the vehicle's travel speed exceeds 30 km / h.

[0076] When it is determined in step S220 that the vehicle's speed exceeds the predetermined speed (Yes), the controller 150 can detect the rotation speed of the drive motor in real time (S230).

[0077] The controller 150 can output to the anti-phase sound source (which matches the speed of the drive motor, and is in...) Figure 6The anti-phase sound source (S240) generated in step S180 corresponds to the rotational speed of the drive motor detected in step S230. When the anti-phase sound source is output through the output device 140 in step S240, the anti-phase sound source cancels out the noise (a specific level of noise) to be reduced in the noise generated by the rotation of the drive motor. Therefore, in step S240, the controller 150 can make the vehicle passengers perceive a significant reduction in noise at a specific level, and can provide a quiet and comfortable in-vehicle environment for the vehicle passengers.

[0078] Simultaneously, when it is determined in step S220 that the vehicle's speed does not exceed the predetermined speed (No), the controller 150 can output a virtual engine sound (S250). In step S250, the virtual engine sound is preferably understood as artificial noise used to notify pedestrians that the electric vehicle is moving or approaching.

[0079] Figure 8 A flowchart illustrating a vehicle sound output method according to another embodiment of the present invention.

[0080] like Figure 8 As shown, the controller 150 can acquire and store pre-generated anti-phase sound sources in response to predetermined cumulative driving distances (S310). In step S310, during the vehicle development phase, pre-generated anti-phase sound sources can be generated for each predetermined cumulative driving distance (e.g., 10,000 km, 20,000 km...100,000 km) pre-set by another vehicle (which is of the same type as the vehicle according to an embodiment of the invention). Here, the anti-phase sound source generated by another vehicle (which is of the same type as the vehicle according to an embodiment of the invention) can be generated by the operation of the controller 150 according to an embodiment of the invention.

[0081] When the vehicle's actual cumulative driving distance becomes a predetermined cumulative driving distance, the controller 150 can update the anti-phase sound source stored in the storage device 120 to an anti-phase sound source pre-generated based on the cumulative driving distance (S320). For example, when the vehicle's actual cumulative driving distance is 10,000 km, in step S320, the controller 150 can update the anti-phase sound source stored in the storage device 120 to an anti-phase sound source pre-generated by another vehicle at 10,000 km. In this way, even if the noise generated in the vehicle changes due to the decrease in durability as the cumulative driving distance increases, the controller 150 can provide a quiet in-vehicle environment for the vehicle passengers by outputting an anti-phase sound source corresponding to the changed noise.

[0082] In the foregoing, although the invention has been described with reference to exemplary embodiments and the accompanying drawings, the invention is not limited thereto, but can be modified and altered by those skilled in the art without departing from the spirit and scope of the invention as claimed in the appended claims.

[0083] Therefore, the embodiments of the present invention are not intended to limit the technical spirit of the invention, but are provided for illustrative purposes only. The scope of protection of the present invention should be interpreted by the appended claims, and all equivalents thereof should be interpreted as included within the scope of the present invention.

[0084] According to embodiments of the present invention, an apparatus and method for outputting vehicle sound can provide passengers with a comfortable vehicle interior environment by reducing noise generated by electric vehicle components inside the vehicle, without increasing additional cost or weight.

[0085] In the foregoing, although the invention has been described with reference to exemplary embodiments and the accompanying drawings, the invention is not limited thereto, but can be modified and altered by those skilled in the art without departing from the spirit and scope of the invention as claimed in the appended claims.

Claims

1. A vehicle sound output device, the device comprising: Sensors configured to sense the vehicle's speed and the rotational speed of the drive motor; A storage device configured to store an antiphase sound source based on the rotational speed of the drive motor; as well as The controller is configured to output an anti-phase sound source corresponding to the rotational speed of the drive motor from an anti-phase sound source stored in a storage device when the vehicle's speed exceeds a predetermined speed. The noise includes the noise generated by the drive motor when the drive motor rotates, the noise of the reducer, and the noise of the inverter; The controller acquires the noise of the drive motor, the noise of the reducer, and the noise of the inverter based on the rotational speed of the drive motor of the electric vehicle. The controller obtains the frequency information of each of the following noises by performing a Fast Fourier Transform on the noise of the drive motor, the reducer, and the inverter, which are obtained according to the rotation speed of the drive motor of the electric vehicle: the noise of the drive motor, the noise of the reducer, and the noise of the inverter.

2. The vehicle sound output device according to claim 1, wherein, The controller tracks the specific level of noise to be reduced based on the frequency information of the noise and the rotational speed of the drive motor.

3. The vehicle sound output device according to claim 2, wherein, The level indicates the number of events that cause noise per unit rotation of the drive motor.

4. The vehicle sound output device according to claim 2, wherein, The controller converts a specific level of noise, tracked by the rotational speed of the drive motor, into time data.

5. The vehicle sound output device according to claim 4, wherein, The controller generates an antiphase noise source of a specific level to be converted into time data, and controls the storage device to store the time data.

6. The vehicle sound output device according to claim 1, wherein, The controller acquires and stores a pre-generated anti-phase sound source in response to a predetermined cumulative driving distance.

7. The vehicle sound output device according to claim 6, wherein, When the vehicle's cumulative driving distance is the predetermined cumulative driving distance, the controller updates the anti-phase sound source stored in the storage device to a pre-generated anti-phase sound source based on the cumulative driving distance.

8. A method for outputting the sound of a vehicle, the method comprising: The noise source is stored in reverse phase based on the rotation speed of the vehicle's drive motor using a storage device. The vehicle's speed is detected by sensors, and when the vehicle's speed exceeds a predetermined speed, the number of revolutions of the drive motor is detected by sensors. The controller is used to output the anti-phase sound source corresponding to the sensed rotation speed of the drive motor from the stored anti-phase sound sources. The noise includes the noise generated by the drive motor when the drive motor rotates, the noise of the reducer, and the noise of the inverter; The controller acquires the noise of the drive motor, the noise of the reducer, and the noise of the inverter based on the rotational speed of the drive motor of the electric vehicle. By performing a Fast Fourier Transform on the noise of the drive motor, the reducer, and the inverter, which are obtained according to the rotational speed of the drive motor of the electric vehicle, the frequency information of each of the noises is obtained.

9. The method according to claim 8, wherein, The storage of the antiphase sound source further includes: Based on the frequency information of the noise, the specific level of noise to be reduced is tracked according to the speed of the drive motor.

10. The method according to claim 9, wherein, The level indicates the number of events that cause noise per unit rotation of the drive motor.

11. The method according to claim 9, wherein, The storage of the antiphase sound source further includes: The noise level, which is tracked based on the rotational speed of the drive motor, is converted into time data.

12. The method according to claim 11, wherein, The storage of the antiphase sound source includes: Generate an inverted noise source of a specific level to be converted into time data.

13. The method of claim 8, further comprising: Acquire and store the pre-generated antiphase sound source in response to a predetermined cumulative driving distance.

14. The method of claim 13, further comprising: When the vehicle's cumulative driving distance reaches the predetermined cumulative driving distance, the stored anti-phase sound source will be updated to a pre-generated anti-phase sound source based on the cumulative driving distance.

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