Electric vehicle driving sound control system and control method

Abstract

A driving sound control system for an electric vehicle may include: a sound output device for generating a driving sound of an electric vehicle; a torque measurement sensor for measuring the torque of a motor in the electric vehicle; an interior noise measurement sensor for detecting the noise of the electric vehicle; and a signal processing controller for controlling the sound output device to reach a target tone by receiving signals from the torque measurement sensor and the interior noise measurement sensor, and the signal processing controller uses the sound output device to extract and output only an acceleration sound component from an engine sound during acceleration by using driving information related to the electric vehicle input in real time from CAN communication and signals input from the interior noise measurement sensor and the torque measurement sensor, and masks high-frequency noise during deceleration.

Description

Technical Field

[0001] The present invention relates to an electric vehicle running sound control system and control method, and more particularly, to an electric vehicle running sound control system and control method using a motor torque or power performance variation value of the electric vehicle. Background Art

[0002] Nowadays, vehicle technology has begun to use drive electric motors instead of internal combustion engines as power sources.

[0003] Since electric vehicles accelerate using electric motors, unlike the engine torque curve of internal combustion engines, powerful torque is injected from the start of acceleration.

[0004] In some electric vehicles, early acceleration is superior to early acceleration in high-displacement internal combustion engine vehicles.

[0005] Compared to internal combustion engines, electric vehicles are very quiet, in contrast to the superior acceleration feel.

[0006] This is because due to its characteristics, it is impossible for an electric car to get an intense engine sound from an electric motor like an internal combustion engine.

[0007] Furthermore, focusing on quietness, conventional electric vehicles have been developed based on the characteristics of electric vehicles (EVs).

[0008] However, there is a trend that today's drivers demand both dynamics and quietness.

[0009] Therefore, vehicle manufacturers also provide various driving modes, such as a comfort mode and a sport mode, in one vehicle, respectively.

[0010] Since internal combustion engine vehicles have a longer history than electric vehicles, drivers are already accustomed to internal combustion engines.

[0011] Therefore, in order for the driver to fully feel the acceleration feeling, not only the speed but also the engine tone corresponding thereto is required.

[0012] To meet such needs, traditional electric vehicles only store a virtual engine tune and then let the driver hear it through the speakers.

[0013] However, in this way, since the driver hears an artificial sound that is not a natural engine tone corresponding to the internal combustion engine, there is a limit to feeling the acceleration feeling like an internal combustion engine vehicle.

[0014] Furthermore, regenerative braking is applied to the electric vehicle at the time of deceleration, and high-frequency noise is generated at the present time.

[0015] This could be removed as it is uncomfortable for the driver.

[0016] However, there is a problem that conventional electric vehicles do not remove such high-frequency noise.

[0017] The information included in this Background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an admission or any form of suggestion that this information constitutes known prior art to those skilled in the art. Summary of the invention

[0018] Various aspects of the present invention are directed to providing an electric vehicle running sound control system and control method.

[0019] The present invention includes an electric vehicle running sound control system, which includes a sound output device for generating the running sound of the electric vehicle; a torque measurement sensor for measuring the torque of a motor in the electric vehicle; an interior noise measurement sensor for detecting the noise of the electric vehicle; and a signal processing controller for controlling the sound output device to reach a target tone by receiving signals from the torque measurement sensor and the interior noise measurement sensor, and the signal processing controller extracts and outputs only the acceleration sound component from the engine sound when achieving the power performance of the engine vehicle matching the power performance of the electric vehicle during acceleration by using the running information related to the electric vehicle input in real time from CAN communication and the signals input from the interior noise measurement sensor and the torque measurement sensor, and uses the sound output device to mask the high-frequency noise during deceleration.

[0020] In addition, whether the electric vehicle is accelerating is determined by determining whether the motor torque change is positive from the torque measurement sensor.

[0021] Furthermore, the motor torque is smoothed in real time.

[0022] Furthermore, an acceleration-feeling sound component is extracted from an engine order arrangement based on an RPM arrangement of the electric motor.

[0023] In addition, an acceleration-sense sound component is provided through the indoor speakers.

[0024] In addition, the acceleration sound component applies a variable bandwidth filter proportional to the RPM of the motor.

[0025] Furthermore, the acceleration sound component to which the variable bandwidth filter is applied has a room tone, which is PID-controlled by a room noise measurement sensor installed in the room.

[0026] Furthermore, the acceleration sound component to which the variable bandwidth filter is applied has an indoor tone, which is PID-controlled by an outdoor noise measurement sensor installed outdoors.

[0027] Also outside is the engine room.

[0028] In addition, whether the electric vehicle is decelerating is determined by determining from the torque measurement sensor whether the motor torque change is negative.

[0029] Furthermore, the motor torque is smoothed in real time.

[0030] Furthermore, masking high frequency noise extracts the components required for masking during deceleration from the RPM of the motor and the negative motor torque.

[0031] Furthermore, the components required for masking are arranged in order according to the RPM of the motor and the torque level in the motor.

[0032] Furthermore, by applying the absolute value to the negative value, the level of the motor torque is converted into a positive value.

[0033] In addition, the present invention includes an electric vehicle running sound control system, which includes a sound output device configured to generate enhanced sound to enhance the running sound of the electric vehicle; a power change measurement sensor for measuring the power change signal of the electric vehicle in real time; and a signal processing controller for controlling the sound output device by applying a variable frequency band filter when the electric vehicle accelerates and performing high frequency noise masking control when the electric vehicle decelerates, using running information related to the electric vehicle input in real time from CAN communication and signals input from an indoor noise measurement sensor and a power change measurement sensor.

[0034] In addition, the electric vehicle driving sound control system also includes an interior noise measurement sensor for detecting the interior noise of the electric vehicle.

[0035] Furthermore, the frequency band of the variable frequency filter is set in proportion to the RPM of the motor.

[0036] Furthermore, the driving information includes at least any one of the RPM of the motor, the pedal opening, the vehicle speed, the driving mode, and the gear position.

[0037] Furthermore, the signal processing controller is configured to select an engine order arrangement corresponding to the internal combustion engine from the RPM of the electric motor.

[0038] In addition, the signal processing controller sets the level in the engine order arrangement by using the RPM of the motor.

[0039] In addition, aspects of the present invention provide an electric vehicle driving sound control method, the method comprising: applying a variable band filter when the electric vehicle accelerates, and performing high frequency noise masking control when the electric vehicle decelerates by operating one or more of the torque and RPM, pedal opening, vehicle speed, driving mode and gear of the electric vehicle's motor in a signal processing controller.

[0040] In addition, the electric vehicle running sound control method further includes an interior noise measurement sensor for detecting interior noise of the electric vehicle.

[0041] Furthermore, the frequency band of the variable frequency filter is set in proportion to the RPM of the motor.

[0042] Furthermore, the high frequency noise masking control applies an absolute value to the motor torque value.

[0043] Furthermore, the signal processing controller is configured to select an engine order arrangement corresponding to the internal combustion engine from the RPM of the electric motor.

[0044] In addition, the signal processing controller sets the level in the engine order arrangement by using the RPM of the motor.

[0045] In addition, various aspects of the present invention provide an electric vehicle driving sound control method, the method comprising: applying a variable band filter when the electric vehicle accelerates, and performing high-frequency noise masking control when the electric vehicle decelerates by operating one or more of the real-time power change amount of the electric vehicle, the RPM of the motor, the pedal opening, the vehicle speed, the driving mode and the gear position in a signal processing controller.

[0046] In addition, when the electric vehicle is traveling at a constant speed, the vehicle speed is applied to the differential control logic.

[0047] According to the exemplary embodiments of the present invention, the following effects can be obtained.

[0048] First, the acceleration feeling can be enhanced in real time by utilizing the torque value or power characteristic changes of the electric motor as the power source of the electric vehicle, thereby performing engine tone control similar to that of an internal combustion engine, thereby providing an acceleration feeling similar to that of an internal combustion engine vehicle.

[0049] Secondly, masking processing can be performed on the high-frequency noise generated when the electric vehicle decelerates, thereby offsetting the unevenness of the electric vehicle.

[0050] Third, the motor torque of the electric vehicle can be used as a reference level, and an interior noise measurement sensor can be included that detects the interior noise of the electric vehicle, thereby achieving a natural engine tone that is closer to reality through PID control.

[0051] The method and apparatus of the present invention have other features and advantages which will become more apparent from or be described in more detail in the accompanying drawings which are incorporated herein and in the following detailed description and which together serve to explain certain inventive principles. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a conceptual diagram according to a first exemplary embodiment of the present invention.

[0053] Figure 2 is a flowchart of a running sound control method of an electric vehicle according to an exemplary embodiment of the present invention.

[0054] Figure 3 and Figure 4 is an algorithm diagram according to a first exemplary embodiment of the present invention.

[0055] Figure 5 and Figure 6 is an algorithm diagram according to a second exemplary embodiment of the present invention.

[0056] Fig. 7A is a diagram before engine tone control at the time of acceleration of an electric vehicle according to a first exemplary embodiment of the present invention, Figure 7B is a diagram showing application of engine tone control at the time of acceleration of an electric vehicle according to a first exemplary embodiment of the present invention, Figure 7C is a graph of a final engine tone through a microphone when an electric vehicle is accelerating according to a first exemplary embodiment of the present invention.

[0057] It will be appreciated that the drawings are not necessarily drawn to scale, presenting somewhat simplified representations of various features illustrating the basic principles of the invention. The specific design features of the present invention as included herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the specific intended application and use environment.

[0058] In the drawings, like reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. DETAILED DESCRIPTION

[0059] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments of the present invention, it should be understood that this specification is not intended to limit the present invention to those exemplary embodiments. On the other hand, the present invention is intended to cover not only exemplary embodiments of the present invention, but also various substitutions, modifications, equivalents and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0060] In describing each of the figures, the same reference numerals are used for the same elements.

[0061] The terms "first", "second", etc. may be used to illustrate different components, but these components may not be limited by the terms. These terms are used to distinguish one element from another.

[0062] For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. The term "and / or" includes a combination of a plurality of associated listed items or any one of the plurality of associated listed items.

[0063] Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which exemplary embodiments of the present invention belong.

[0064] It will be further understood that terms, such as those defined in commonly used dictionaries, may be additionally interpreted as having meanings consistent with their meanings in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless so defined in the application.

[0065] Reference Figure 1 , an EV (electric vehicle) vehicle 100 includes an electric vehicle driving sound control system 100-3 at a passenger compartment 100-1. The electric vehicle driving sound control system 100-3 includes a motor 101, a sound output device 102, a signal processing controller 103, an indoor noise measurement sensor 104, a proportional integral derivative (PID) controller 105, an outdoor noise measurement sensor 106, and a torque measurement sensor 107.

[0066] The electric vehicle 100 forms an engine room 100 - 2 in front of a passenger compartment 100 - 1 , and forms a luggage room in the rear of the passenger compartment 100 - 1 .

[0067] In the present case, the passenger compartment 100-1 provides a placement location for the sound output device 102, the signal processing controller 103, the indoor noise measuring sensor 104, and the PID controller 105, and the engine compartment 100-2 provides a placement location for the motor 101, the outdoor noise measuring sensor 106, and the torque measuring sensor 107. However, the components of the electric vehicle driving sound control system 100-3 may be appropriately installed in any one of the passenger compartment 100-1 and the engine compartment 100-2.

[0068] The sound output device 102 generates enhanced sound to enhance the driving sound of the electric vehicle 100. The sound output device 102 is connected to the signal processing controller 103 or the PID controller 105.

[0069] The torque measurement sensor 107 measures the torque signal of the torque signal unit 110 of the motor 101 of the electric vehicle 100 in real time. Figure 3 ). However, the torque measurement sensor 107 is converted into a power variation measurement sensor 110-1 to measure the power variation of the motor 101 of the electric vehicle 100 in real time. (See Figure 5 )

[0070] The interior noise measurement sensor 104 is used to set the PID control to detect the interior noise of the electric vehicle 100 to correspond to the engine tone that is enhanced when the vehicle is accelerating.

[0071] The signal processing controller 103 controls the sound output device 102 or the PID controller 105 when the electric vehicle 100 is accelerating, decelerating, or traveling at a constant speed.

[0072] The signal processing controller 103 receives signals from the torque measurement sensor 107, the outdoor noise measurement sensor 106, and the indoor noise measurement sensor 104 to control the sound output device to achieve the target tone. The signal processing controller 103 controls the sound output device 102 by using the driving information about the electric vehicle 100 input in real time from the CAN (Controller Area Network) communication and the signals input from the indoor noise measurement sensor 104 and the outdoor noise measurement sensor 106.

[0073] When the power performance of the engine vehicle matching the power performance of the electric vehicle 100 is achieved at the time of acceleration of the electric vehicle 100 , the signal processing controller 103 extracts and outputs only the acceleration-feeling sound component from the engine sound.

[0074] That is, the signal processing controller 103 matches and outputs an acceleration sound corresponding to a general internal combustion engine when the electric vehicle 100 accelerates.

[0075] The signal processing controller 103 may preferably apply the variable frequency band filter 223 (or variable bandwidth filter) when the electric vehicle 100 is accelerating (see Figure 4 and Figure 6 ).

[0076] Meanwhile, whether the electric car 100 is accelerated is performed by whether a torque change of the motor 101 is determined to be positive in the torque measurement sensor.

[0077] That is, when the torque variation of the motor 101 is positive, it can be determined that the electric vehicle 100 is in the acceleration state.

[0078] Preferably, the torque of the electric motor 101 is smoothed in real time on an instant basis. In the present case, the smoothing process refers to a method of eliminating the less important parts of the torque.

[0079] Meanwhile, an acceleration-feeling sound component may be extracted from an engine order arrangement based on an RPM arrangement of the motor 101 .

[0080] Furthermore, the acceleration-feeling sound component may preferably be subjected to a variable-band filter 223 (or a variable-bandwidth filter) that is proportional to the RPM of the motor 101 .

[0081] Therefore, the acceleration sound component to which the variable band filter 223 is applied may also preferably have an indoor tone that is PID-controlled by the PID controller 105 through an indoor noise measurement sensor installed in the electric vehicle 100 .

[0082] Meanwhile, the acceleration sound component to which the variable band filter 223 is applied may also preferably have an indoor tone that is PID-controlled by the PID controller 105 through the outdoor noise measurement sensor 106 installed outside the electric vehicle 100 .

[0083] In the present case, the outdoors may be an engine room 100 - 2 of the electric vehicle 100 , and the indoors may be a passenger compartment 100 - 1 of the electric vehicle 100 .

[0084] The driving information at the present moment may preferably include at least one of the RPM (revolutions per minute) of the motor 101 , the pedal opening, the vehicle speed, the driving mode, and the gear position.

[0085] The frequency band of the variable frequency band filter 223 may preferably be set in proportion to the RPM of the motor 101 of the electric vehicle 100 .

[0086] That is, it is preferable to use a narrow frequency band in a region where the RPM of the motor 101 of the electric vehicle 100 is low, and conversely, it is preferable to use a wide frequency band in a region where the RPM thereof is high.

[0087] In order to increase the acceleration feeling of the electric vehicle 100 , the engine tone is controlled by applying the torque value of the motor in real time after the order frequency is generated based on the RPM of the motor.

[0088] That is, the engine order arrangement matching the vehicle's grade is selected based on the RPM of the motor 101 of the electric car 100. In the present case, the vehicle's grade means a vehicle class classification such as small, medium, or large.

[0089] For example, when the electric vehicle 100 is of a middle level, the second order component, the fourth order component, and the sixth order component may be used.

[0090] Meanwhile, when the electric vehicle 100 is of a large scale, the third order component, the fourth order component, the sixth order component, and the ninth order component may be used.

[0091] As described above, in the order arrangement selected based on the RPM of the motor 101 extracted in real time, the level is set for each order arrangement by using the torque value of the motor as the reference level. The engine tone control under the acceleration condition of the electric vehicle 100 can use an arrangement that adds integer order components and non-integer order components.

[0092] Integer-order components refer to the fundamental frequency harmonic components obtained based on the number of engine cylinders.

[0093] For example, in the case of a six-cylinder internal combustion engine, the third order component, the sixth order component, and the ninth order component become integer order components, and the fourth order component and the eighth order component become non-integer order components.

[0094] When the electric vehicle 100 accelerates, after a basic acceleration tone is achieved through integer tone enhancement, a non-integer order component lower than the level of the integer order may be added, thereby performing engine tone control for acceleration conditions.

[0095] Conversely, high frequency noise masking control may be performed when the electric vehicle 100 is decelerating. In this context, noise (or sound) masking is the addition of natural or artificial sounds (commonly, though inaccurately, referred to as "white noise" or "pink noise") to an environment to mask unwanted sounds using auditory masking.

[0096] Currently, whether the electric vehicle 100 is decelerating is determined by whether a torque change of the motor 101 is determined to be negative in the torque measurement sensor.

[0097] Preferably, when the electric vehicle 100 decelerates, the torque of the motor 101 can be smoothed in real time.

[0098] When the electric vehicle 100 is decelerating, high-frequency fine noise is generated at the time of regenerative braking, and it can be suppressed by high-frequency noise masking control.

[0099] Masking high frequency noise is an operation of extracting a component necessary for masking during deceleration from the RPM of the motor 101 and its negative motor torque.

[0100] In the present case, the components required for masking may preferably be from the order arrangement of the RPM of the motor 101 and its motor torque level.

[0101] Meanwhile, by applying an absolute value to a negative value, the level of the motor torque at the present moment can be preferably converted into a positive value.

[0102] The high-frequency noise masking control utilizes integer-order components, and is controlled by a method for reducing the level of the order components in a frequency-decreasing direction that occurs when the vehicle is decelerated.

[0103] That is, the high-frequency noise masking control may preferably apply an absolute value to the torque value of the motor 101 .

[0104] Meanwhile, the order frequency determination based on the RPM of the motor 101 of the electric vehicle 100 is obtained by the following equation.

[0105]

[0106] (Currently, N is the number of cylinders).

[0107] At the same time, n is obtained by multiplying the fundamental frequency value by n th Order component frequency.

[0108] The signal processing controller 103 may preferably select an engine order arrangement corresponding to the internal combustion engine from the RPM of the electric motor 101 .

[0109] Meanwhile, the signal processing controller 103 may preferably set a level in the engine order arrangement by using the RPM of the motor 101 .

[0110] Next, a running sound control method of the electric vehicle 100 according to an exemplary embodiment of the present invention will be described.

[0111] Figure 2 is a flowchart of a running sound control method of the electric vehicle 100 according to an exemplary embodiment of the present invention.

[0112] The signal processing controller 103 obtains any one or more of the real-time power variation, the RPM of the motor 101 of the electric vehicle 100 , the pedal opening, the vehicle speed, the driving mode, and the gear position S1 , and operates any one or more of the above S2 .

[0113] It is determined whether the electric vehicle 100 is accelerating S3, and when the electric vehicle 100 is accelerating, the variable band filter is applied S4.

[0114] It is determined whether the electric vehicle 100 is accelerating S3 , and when the electric vehicle 100 is not accelerating, it is determined whether the electric vehicle is decelerating S6 .

[0115] When the electric vehicle 100 is decelerating, the high-frequency noise masking control S7 is executed.

[0116] At the same time, it is determined whether the electric vehicle 100 is decelerating S6, and when the electric vehicle 100 is traveling at a constant speed instead of non-decelerating, the vehicle speed is applied to the differential control logic S8.

[0117] Figure 3 and Figure 4 is an algorithm diagram according to a first exemplary embodiment of the present invention.

[0118] refer to Figure 3 and Figure 4 , the signal processing controller 103 includes an input device 200 - 1 , an algorithm device 200 and an output device 200 - 2 .

[0119] The input device 200 - 1 includes a torque signal unit 110 , an RPM unit 120 , a pedal opening unit 130 , a vehicle speed unit 140 , and a driving mode and gear unit 150 .

[0120] The algorithm device 200 includes a first torque signal unit 211, a second torque signal unit 212, a torque high-frequency noise masking control unit 213, a torque acceleration enhancement unit 214, an engine tone control unit 215, an order arrangement unit 221, an RPM weighted value information unit 222, a variable frequency band filter 223, a pedal opening weighted value information unit 230, a vehicle speed change differential value unit 240, an order arrangement selection unit 250, an order arrangement calculation unit 260, a real-time amplification unit 270, an audio system master volume unit 280 and a frequency band weighted value setting unit 290.

[0121] The output device 200 - 2 includes a speaker 300 .

[0122] The operation of the algorithm according to the first exemplary embodiment of the present invention is as follows.

[0123] Referring to the input device 200 - 1 , the torque measurement sensor 107 measures a torque signal of the torque signal unit 110 of the motor 101 of the electric vehicle 100 in real time.

[0124] The signal processing controller 103 receives the driving information related to the electric vehicle 100 in real time from the CAN communication.

[0125] The driving information may include the RPM of the RPM unit 120 of the motor 101, the pedal opening of the pedal opening unit 130, the vehicle speed of the vehicle speed unit 140, the driving mode, and the gear of the driving mode of the gear unit 150.

[0126] Referring to the algorithm device 200 , the torque signal of the torque signal unit 110 of the motor 101 of the electric vehicle 100 includes a first torque signal of a first torque signal unit 211 and a second torque signal of a second torque signal unit 212 .

[0127] The first torque signal of the first torque signal unit 211 and the second torque signal of the second torque signal unit 212 are respectively smoothed.

[0128] The first torque signal of the first torque signal unit 211 corresponds to a torque value when the torque signal 110 of the motor 101 of the electric vehicle 100 decreases.

[0129] Currently, the order calculation unit 260 of the signal processing controller 103 determines the engine order corresponding to the internal combustion engine according to the RPM of the motor 101 .

[0130] Meanwhile, the first torque signal of the first torque signal unit 211 may preferably apply an absolute value to the torque value of the motor 101 through high-frequency noise masking control of the torque high-frequency noise masking control unit 213 .

[0131] The second torque signal of the second torque signal unit 212 corresponds to a torque value when the torque signal of the torque signal unit 110 of the motor 101 of the electric vehicle 100 increases.

[0132] The order arrangement of the order arrangement unit 221 for enhancing the acceleration sound through the RPM of the RPM unit 120 communicated through the CAN is used for the second torque signal of the second torque signal unit 212 .

[0133] The second torque signal of the second torque signal unit 212 is output as information related to the torque acceleration feeling enhancement unit 214 to enhance the acceleration feeling when the electric vehicle 100 is accelerated, and is input to the engine tone control unit of the engine tone control unit 215 .

[0134] The signal processing controller 103 determines the engine order arrangement of the order arrangement unit 221 corresponding to the internal combustion engine according to the RPM of the motor 101 .

[0135] Meanwhile, the signal processing controller 103 sets the level in the engine ranking of the ranking unit 221 by using the RPM of the motor 101 .

[0136] The signal processing controller 103 executes the engine tone control unit 215 by using the RPM and the torque value of the motor according to the acceleration condition or the deceleration condition of the motor.

[0137] The amplification level between the components of the engine order determined at the moment is set and amplified in real time by the real-time amplification unit 270 .

[0138] In addition, the driving mode and gear information related to the driving mode and gear unit 150 input through CAN communication is selected by the order arrangement selection unit 250 according to the change of driving modes such as fuel-saving driving, normal driving and sports driving, and the arrangement of the engine order components is applied to the engine tone control unit 215.

[0139] A variable frequency based on RPM following the variable band filter 223 of the engine tone control unit 215 may be applied.

[0140] Currently, the motor RPM of the RPM unit 120 input through the CAN communication may be reflected.

[0141] The signal that has passed through the variable band filter 223 is input to the audio system master volume unit 280 .

[0142] Currently, the audio system master volume unit 280 may receive RPM weighted value information about the RPM weighted value information unit 222 , the weighted value being added to the motor RPM of the RPM unit 120 input by CAN communication.

[0143] In addition, the audio system master volume unit 280 may receive pedal opening weighted value information related to the pedal opening weighted value information unit 230 , the weighted value being added to the pedal opening of the pedal opening unit 130 input by CAN communication.

[0144] Referring to the output device 200 - 2 , the audio system master volume unit 280 sends a signal to the band weight value setting unit 290 , and the signal to which the weight value is added by the band weight value setting unit 290 is finally output as a running sound through the speaker 300 of the sound output device 102 .

[0145] Currently, information on the vehicle speed change differential value of the vehicle speed change differential value unit 240 of the vehicle speed data of the vehicle speed unit 140 input through CAN communication may be added to the signal output from the band weight value setting unit 290 .

[0146] Next, a second exemplary embodiment of the present invention will be described. Figure 5 and Figure 6 2 is an algorithm diagram according to a second exemplary embodiment of the present invention. In this case, the signal processing controller 103 includes an input device 200-1, an algorithm device 200, and an output device 200-2.

[0147] Reference Figure 5The input device 200-1 of the second exemplary embodiment is different from the input device 200-1 of the first exemplary embodiment of the present invention in that a power change amount measuring sensor 110-1 is used. For example, the power change amount measuring sensor 110-1 uses a sensor value of an acceleration condition proportional to a motor power change during acceleration and a sensor value of a deceleration condition proportional to a motor power change during deceleration. Therefore, the sensor value of the power change amount measuring sensor 110-1 can be set in a magnetic sensor that detects a power change of the motor 101 of the electric vehicle 100 as a magnetic flux or in various sensors having the same effect.

[0148] refer to Figure 5 and Figure 6 Unlike the input device 200-1 of the first exemplary embodiment, the algorithm device 200 utilizes a first power change signal unit 411 instead of the first torque signal unit 211, utilizes a second power change signal unit 412 instead of the second torque signal unit 212, utilizes a power high-frequency noise masking control unit 413 instead of the torque high-frequency noise masking control unit 213, and utilizes a power acceleration sense enhancement unit 414 instead of the torque acceleration sense enhancement unit 214.

[0149] See also Figure 6 , by including the speaker 300, the output device 200-2 of the second exemplary embodiment is the same as the output device 200-2 of the first exemplary embodiment of the present invention.

[0150] Therefore, the second exemplary embodiment is the same as the first exemplary embodiment, except that a power variation measurement sensor is used instead of the torque sensor of the various exemplary embodiments.

[0151] The sound output device 102 generates enhanced sound to enhance the running sound of the electric vehicle 100 .

[0152] The power variation measurement sensor 110 - 1 measures a power variation signal of the electric vehicle 100 in real time.

[0153] The signal processing controller 103 controls the sound output device 102 when the electric car 100 accelerates or decelerates.

[0154] The signal processing controller 103 controls the sound output device 102 by using the travel information about the electric vehicle 100 input in real time from the CAN communication, and the signals input from the interior noise measurement sensor 104 and the power variation measurement sensor 110 - 1 .

[0155] The signal processing controller 103 applies the variable band filter 223 when the electric vehicle 100 is accelerating, and performs high-frequency noise masking control of the power high-frequency noise masking control unit 413 when the electric vehicle 100 is decelerating.

[0156] The current driving information may preferably include at least one of the RPM of the RPM unit 120 of the motor 101 , the pedal opening of the pedal opening unit 130 , the vehicle speed of the vehicle speed unit 140 , and the driving mode and gear of the driving mode and gear unit 150 .

[0157] The frequency band of the variable frequency band filter 223 may preferably be set in proportion to the RPM of the motor 101 of the electric vehicle 100 .

[0158] Meanwhile, the high-frequency noise masking control of the power high-frequency noise masking control unit 413 may preferably apply an absolute value to the power change amount (or torque value) of the motor 101 .

[0159] The driving information may include at least any one of the RPM of the RPM unit 120 of the motor 101 , the pedal opening of the pedal opening unit 130 , the vehicle speed of the vehicle speed unit 140 , and the driving mode and gear of the driving mode and gear unit 150 .

[0160] At present, the interior noise measuring sensor 104 may preferably detect the interior noise of the electric vehicle 100 .

[0161] The signal processing controller 103 may preferably select the engine order arrangement of the order arrangement unit 221 corresponding to the internal combustion engine from the RPM of the motor 101 .

[0162] The signal processing controller 103 may preferably set the level in the engine order ranking of the order ranking unit 221 by using the RPM of the motor 101 .

[0163] That is, the signal processing controller 103 may operate any one or more of the torque and RPM of the motor 101 of the electric vehicle 100 , the pedal opening, the vehicle speed, the driving mode, and the gear position.

[0164] With this, the signal processing controller 103 can preferably apply the variable band filter when the electric vehicle 100 is accelerating, and perform the high-frequency noise masking control of the power high-frequency noise masking control unit 413 when the electric vehicle 100 is decelerating.

[0165] Currently, the interior noise measuring sensor 104 may preferably detect the interior noise of the electric vehicle 100 .

[0166] Preferably, the frequency band of the variable frequency band filter 223 may be set in proportion to the RPM of the motor 101 .

[0167] Furthermore, the high-frequency noise masking control of the power high-frequency noise masking control unit 413 may preferably apply an absolute value to the power change amount (or torque value) of the motor 101 .

[0168] The signal processing controller 103 may preferably select the engine order arrangement of the order arrangement unit 221 corresponding to the internal combustion engine from the RPM of the motor 101 .

[0169] Meanwhile, the signal processing controller 103 may preferably set the level in the engine order ranking of the order ranking unit 221 by using the RPM of the motor 101 .

[0170] Figure 5 and Figure 6 is an algorithm diagram according to a second exemplary embodiment of the present invention.

[0171] Referring to the input device 200 - 1 , the power variation measurement sensor 110 - 1 measures the power variation of the motor 101 of the electric vehicle 100 in real time.

[0172] The signal processing controller 103 receives the driving information related to the electric vehicle in real time from the CAN communication.

[0173] The driving information may include the RPM of the RPM unit 120 of the motor 101 , the pedal opening of the pedal opening unit 130 , the vehicle speed of the vehicle speed unit 140 , the driving mode and the gear of the driving mode and gear unit 150 , and the like.

[0174] Referring to the algorithm device 200 , the power variation signal of the power variation measurement sensor 110 - 1 of the motor 101 of the electric vehicle 100 includes a first power variation signal unit 411 and a second power variation signal unit 412 .

[0175] The first power change value signal of the first power change signal unit 411 and the second power change value signal of the second power change signal unit 412 are respectively smoothed.

[0176] The first power change value signal of the first power change signal unit 411 corresponds to a power change value when the power change value signal of the motor 101 of the electric vehicle decreases.

[0177] Currently, the signal processing controller 103 determines the engine order arrangement of the order arrangement unit 221 corresponding to the internal combustion engine according to the RPM of the motor 101.

[0178] Meanwhile, the first power change value signal of the first power change signal unit 411 may preferably apply an absolute value to the power change value (or torque value) of the motor 101 through high-frequency noise masking control of the power high-frequency noise masking control unit 413 .

[0179] The second power change value signal of the second power change signal unit 412 corresponds to a power change value when the power change value signal of the motor 101 of the electric vehicle 100 increases.

[0180] The order arrangement of the order arrangement unit 221 for the RPM enhanced acceleration sound of the RPM unit 120 through CAN communication is used for the second power change signal unit 412 .

[0181] The signal processing controller 103 determines the engine order arrangement of the order arrangement unit 221 corresponding to the internal combustion engine according to the RPM of the motor 101 .

[0182] At the same time, the signal processing controller 103 sets the level in the engine order ranking of the order ranking unit 221 using the RPM of the motor 101 .

[0183] The signal processing controller 103 executes the engine tone control unit 215 by using the RPM and torque value of the motor according to the acceleration condition or the deceleration condition of the motor.

[0184] The amplification level between the respective components of the engine order determined at this time is set and amplified in real time by the real-time amplification unit 270 .

[0185] In addition, the driving mode and gear information related to the driving mode and gear unit 150 input through CAN communication is selected by the order arrangement selection unit 250 to select the arrangement of engine order components according to the changes in driving modes such as fuel-saving driving, normal driving and sports driving, and the arrangement of the engine order components is applied to the engine tone control unit 215.

[0186] A variable frequency based on RPM following the variable band filter 223 of the engine tone control unit 215 may be applied.

[0187] Currently, the motor RPM of the RPM unit 120 input through the CAN communication may be reflected.

[0188] The signal that has passed through the variable band filter 223 is input to the audio system master volume unit 280 .

[0189] Currently, the audio system master volume unit 280 may receive RPM weighted value information about the RPM weighted value information unit 222 , the weighted value being added to the motor RPM of the RPM unit 120 input by CAN communication.

[0190] In addition, the pedal opening weighted value information related to the pedal opening weighted value information unit 230 may be input to the audio system master volume unit 280, and the weighted value is added to the pedal opening of the pedal opening unit 130 input by CAN communication.

[0191] Referring to the output device 200 - 2 , the audio system master volume unit 280 transmits a signal to the band weight value setting unit 290 , and the signal to which the weight value is added by the band weight value setting unit 290 is finally output as a driving sound through the speaker 300 of the sound output device 102 .

[0192] Currently, information on the vehicle speed change differential value of the vehicle speed change differential value unit 240 of the vehicle speed data of the vehicle speed unit 140 input through CAN communication may be added to the signal output from the band weight value setting unit 290 .

[0193] Fig. 7A 1 is a diagram before engine tone control when the electric vehicle 100 is accelerated according to the first exemplary embodiment of the present invention. Figure 7B is a graph showing application of engine tone control at the time of acceleration of the electric vehicle 100 according to the first exemplary embodiment of the present invention. Figure 7C is a graph of a final engine tone through a microphone when the electric vehicle 100 is accelerated according to the first exemplary embodiment of the present invention.

[0194] By applying the arrangement of the order component groups for enhancing the acceleration feeling at the time of acceleration of the electric car 100 and the level based on the motor torque, a result in which only the tone of the necessary component is amplified is shown.

[0195] This is a result of applying a variable band filter that is proportional to the RPM of the motor.

[0196] Therefore, it can be confirmed that natural tone control of the engine can be performed.

[0197] Meanwhile, the PID control of the PID controller 105 may be performed by the interior noise measuring sensor 104 installed in the electric vehicle 100 , thereby confirming the result that only necessary components are amplified.

[0198] For convenience of explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner", "outer", "upper", "lower", "upper", "lower", "front", "back", "back", "inner", "outer", "inner", "outer", "inner", "outer", "inner", "forward" and "rearward" are used to describe features of the exemplary embodiments with reference to the positions of features as shown in the drawings. It will also be understood that the term "connect" or its derivatives refer to both direct and indirect connections.

[0199] The foregoing descriptions of specific exemplary embodiments of the present invention have been given for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise form disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. Exemplary embodiments are selected and described to explain certain principles of the present invention and their practical application, so that other persons skilled in the art can make and utilize various exemplary embodiments of the present invention and various alternatives and modifications thereof. The scope of the present invention is intended to be defined by the appended claims and their equivalents.

Claims

1. An electric vehicle (EV) driving sound control system, comprising: A sound output device for generating the driving sound of an electric vehicle; A torque measurement sensor for measuring the torque of the motor in the electric vehicle; an indoor noise measurement sensor for detecting noise of the electric vehicle; and a signal processing controller configured to control the sound output device to achieve a target tone by receiving signals from the torque measurement sensor and the room noise measurement sensor, wherein the signal processing controller is configured to extract and output an acceleration sound component from an engine sound when the power performance of an engine vehicle matching the power performance of the electric vehicle is achieved when the electric vehicle is accelerated, by using driving information related to the electric vehicle input in real time from CAN communication and signals input from the interior noise measurement sensor and the torque measurement sensor, and to mask high-frequency noise when the electric vehicle is decelerated using the sound output device, The signal processing controller is configured to: when the electric vehicle accelerates, match and output an acceleration sound corresponding to a general internal combustion engine, wherein the acceleration sound component is extracted from an engine order arrangement arranged based on the RPM of the motor, and the acceleration sound component applies a variable bandwidth filter proportional to the RPM of the motor, wherein the acceleration sound component to which the variable bandwidth filter is applied has an indoor tone, and the indoor tone is subjected to proportional-integral-derivative PID control by the indoor noise measurement sensor installed indoors, and The acceleration sound component to which the variable bandwidth filter is applied has an indoor tone, and the indoor tone is PID-controlled by an outdoor noise measurement sensor installed outdoors.

2. The electric vehicle running sound control system according to claim 1, in, Whether the electric vehicle is accelerating is determined by determining whether a torque change of the electric motor is positive from the torque measurement sensor.

3. The electric vehicle running sound control system according to claim 1, in, The torque of the electric motor is smoothed in real time.

4. The electric vehicle running sound control system according to claim 1, in, The acceleration sound component is provided through indoor speakers.

5. The electric vehicle running sound control system according to claim 1, in, determining whether the electric vehicle is decelerating by determining from the torque measurement sensor whether a torque change of the electric motor is negative, and The torque of the electric motor is smoothed in real time.

6. The electric vehicle running sound control system according to claim 1, in, The process of masking high frequency noise extracts components required for masking when the electric vehicle decelerates from the RPM of the motor and the negative torque of the motor.

7. The electric vehicle running sound control system according to claim 6, in, The components required for masking are arranged in order according to the RPM of the motor and the torque level in the motor, and Therein, the torque level of the motor is converted to a positive value by applying an absolute value to a negative torque value.

8. An electric vehicle (EV) driving sound control system, comprising: a sound output device that generates enhanced sound to enhance the driving sound of the electric vehicle; A power variation measurement sensor, which measures the power variation signal of the electric vehicle in real time; and a signal processing controller configured to control the sound output device by applying a variable band filter when the electric vehicle accelerates and performing high frequency noise masking control when the electric vehicle decelerates, by using driving information related to the electric vehicle input in real time from CAN communication and signals input from an interior noise measurement sensor and the power variation measurement sensor, The signal processing controller is configured to: when the electric vehicle accelerates, match and output an acceleration sound corresponding to a general internal combustion engine, wherein the acceleration sound component is extracted from an engine order arrangement arranged based on the RPM of the motor, and the acceleration sound component applies a variable bandwidth filter proportional to the RPM of the motor, wherein the acceleration sound component to which the variable bandwidth filter is applied has an indoor tone, and the indoor tone is subjected to proportional-integral-derivative PID control by the indoor noise measurement sensor installed indoors, and The acceleration sound component to which the variable bandwidth filter is applied has an indoor tone, and the indoor tone is PID-controlled by an outdoor noise measurement sensor installed outdoors.

9. The electric vehicle running sound control system according to claim 8, wherein: The interior noise measurement sensor detects interior noise of the electric vehicle.

10. The electric vehicle running sound control system according to claim 8, in, The driving information includes at least one of an RPM of the motor, a pedal opening, a vehicle speed, a driving mode, and a gear position.

11. The electric vehicle running sound control system according to claim 8, in, The signal processing controller is configured to select an engine order arrangement corresponding to the engine according to the RPM of the motor, and Wherein the signal processing controller is configured to set a level in an engine order arrangement by using the RPM of the electric motor.

12. A method for controlling the running sound of an electric vehicle (EV), comprising: By operating one or more of torque and RPM, pedal opening, vehicle speed, driving mode and gear position of a motor of an electric vehicle in a signal processing controller, a variable band filter is applied when the electric vehicle is accelerated, and high frequency noise masking control is performed when the electric vehicle is decelerated, The signal processing controller is configured to: when the electric vehicle accelerates, match and output an acceleration sound corresponding to a general internal combustion engine, wherein the acceleration sound component is extracted from an engine order arrangement arranged based on the RPM of the motor, and the acceleration sound component applies a variable bandwidth filter proportional to the RPM of the motor, wherein the acceleration sound component to which the variable bandwidth filter is applied has an indoor tone, and the indoor tone is subjected to proportional-integral-derivative PID control by the indoor noise measurement sensor installed indoors, and The acceleration sound component to which the variable bandwidth filter is applied has an indoor tone, and the indoor tone is PID-controlled by an outdoor noise measurement sensor installed outdoors.

13. The electric vehicle running sound control method according to claim 12, wherein: The interior noise measurement sensor detects interior noise of the electric vehicle.

14. The electric vehicle running sound control method according to claim 12, in, The frequency band of the variable frequency band filter is set in proportion to the RPM of the motor, and Therein, high frequency noise masking control applies an absolute value to the torque value of the motor.

15. The electric vehicle running sound control method according to claim 12, in, The signal processing controller is configured to select an engine order arrangement corresponding to the engine according to the RPM of the motor, and Wherein the signal processing controller is configured to set a level in the engine order arrangement by using the RPM of the electric motor.

16. The electric vehicle running sound control method according to claim 12, further comprising: By operating one or more of the real-time power variation of the electric vehicle, the RPM of the motor, the pedal opening, the vehicle speed, the driving mode and the gear position in the signal processing controller, a variable band filter is applied when the electric vehicle accelerates, and high-frequency noise masking control is performed when the electric vehicle decelerates.

17. The electric vehicle running sound control method according to claim 12, in, When the electric vehicle is traveling at a constant speed, the vehicle speed is applied to a differential control logic.

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