JP2004074994A - In-cabin noise control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suitably control engine related sound heard by an occupant in a cabin of a vehicle by output sound into the cabin, and capable of generating a comfortable sound giving sporty feeling to the occupant without giving incompatible feeling. <P>SOLUTION: A sound pressure of a frequency order component in the engine related sound heard by the occupant is varied in accordance with a traveling condition of the vehicle. Concretely, the mode is switched between a first control mode whereby output sound for reducing a sound pressure difference between an even-order component and an odd-order component and a half-order component of which order component is adjacent to the even-order component is reduced in a frequency order component in the engine related sound heard by the occupant is outputted into the cabin, and a second control mode whereby output sound for increasing a sound pressure ratio of the even-order component with respect to the odd-order component and the half-order component is ouputted into the cabin in accordance with the traveling condition of the vehicle. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to a technical field related to a vehicle interior sound control device that controls an engine-related sound generated by the rotation of an engine of the vehicle, which is heard by an occupant in the vehicle interior, by an output sound to the vehicle interior.
[0002]
[Prior art]
Conventionally, for example, as disclosed in Japanese Patent No. 3278176 and Japanese Patent No. 3278185, a signal corresponding to the engine rotation is detected, and a reference signal is generated based on the detected signal. It is well known that a speaker cancels the noise collected by a microphone in the vehicle cabin and outputs the noise to the vehicle cabin in order to reduce the noise. If this noise reduction technology is used, the occupant can be made to feel as if there is no engine-related sound (e.g., engine sound or exhaust sound) generated particularly with the rotation of the engine. Even so, noise can be reduced.
[0003]
[Problems to be solved by the invention]
However, simply reducing the engine-related sound that can be heard by the occupants in the passenger compartment using the above noise reduction technology cannot satisfy the occupants (particularly the driver) and has room for improvement. In other words, if the engine-related sound is reduced when the engine speed is relatively low, especially when accelerating during the start-up phase of the vehicle, the occupant feels a running feeling with the body, but the running feeling differs from the feeling heard by the ear. They feel uncomfortable or lack of sportiness and feel unsatisfactory. On the other hand, if the engine speed is quite high, reducing the engine-related sound can give the occupant a sense of quietness. Is too low to feel uncomfortable and unsatisfactory.
[0004]
In recent years, a hybrid vehicle using an engine and an electric motor as a drive source and a vehicle having a continuously variable transmission have been developed. In such a vehicle, the operation of the electric motor and the gear of the continuously variable transmission have been developed. With the change in the ratio, the engine output characteristics with respect to the amount of depression of the accelerator pedal by the occupant are changed. That is, in a state where the engine output is suppressed, acceleration is performed by assisting the electric motor or changing the gear ratio of the continuously variable transmission. In this case, even when the accelerator pedal is depressed, the engine is accelerated in a state where the engine output is suppressed (a state where the increase in the engine speed is suppressed). Therefore, even if the noise reduction technology is not used, the engine-related sound does not increase much. Therefore, the occupant may feel uncomfortable due to the difference between the running feeling felt by the body and the feeling heard by the ear, and may feel uncomfortable.
[0005]
Further, in recent years, even if the vehicle is not a hybrid vehicle as described above, from the viewpoint of emphasizing fuel consumption performance, the engine speed is suppressed to a low level, and traveling performance such as acceleration performance tends to be relatively low. In such a vehicle, the occupant feels unsatisfactory without feeling sporty.
[0006]
The present invention has been made in view of such a point, and an object of the present invention is to appropriately control an engine-related sound that can be heard by an occupant in a vehicle cabin based on an output sound to the cabin to make the occupant feel uncomfortable. The aim is to always give a comfortable sound that makes you feel sporty without feeling it.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, the sound pressure of the frequency order component of the engine-related sound heard by the occupant is changed according to the running state of the vehicle.
[0008]
Specifically, according to the first aspect of the present invention, a vehicle interior sound control device that controls an engine-related sound, which is heard by an occupant in the vehicle interior and occurs with the rotation of the engine of the vehicle, based on an output sound to the vehicle interior. Target.
[0009]
Then, the sound pressure of the frequency order component of the engine-related sound that can be heard by the occupant is changed according to the running state detecting means for detecting the running state of the vehicle and the running state of the vehicle detected by the running state detecting means. Control means for outputting the output sound to the vehicle interior.
[0010]
According to the above configuration, the timbre of the engine-related sound that can be heard by the occupant can be changed according to the running state of the vehicle. For example, when the running speed of the vehicle is equal to or lower than a predetermined speed, the frequency order of the engine-related sound Among the components, an even-order component (i-order component (i = 2, 4, 6,...)), An odd-order component (i−1-order component, i + 1-order component) and a half-order component whose order is close to the even-order component By reducing the sound pressure difference from each of the components (the i-0.5 order component and the i + 0.5 order component), the sound becomes sluggish and powerful, and the occupant can be given a sporty feeling and the occupant can feel his / her body. It is possible to suppress the occurrence of a sense of incongruity caused by the difference between the feeling of running and the feeling of hearing with the ear. On the other hand, when the traveling speed of the vehicle is higher than the predetermined speed, the sound pressure ratio of each of the odd-order component and the half-order component of the even-order component is increased, so that the sound becomes clear and smooth, and the sound is too low for the occupant. This can give a sense of quietness without giving a sense of incongruity or unsatisfactoryness caused by the above. Therefore, by letting the occupant hear a sound suitable for the running state, it is possible to always hear a comfortable sound that gives a sense of sporty without feeling uncomfortable.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the control means includes an even-order component and an odd-order component and a half-order component whose order is close to the even-order component in the frequency order component of the engine-related sound heard by the occupant. A first control mode for outputting an output sound for reducing the sound pressure difference from each of the components to the vehicle interior, and an output sound for increasing the sound pressure ratio for each of the odd-order component and the half-order component of the even-order component to the vehicle interior. The second control mode to be output is switched and executed according to the traveling state of the vehicle detected by the traveling state detecting means.
[0012]
As a result, in the first control mode, the engine-related sound that can be heard by the occupant can be made powerful, and in the second control mode, the sound can be made clear and smooth. By switching in accordance with the running state, it is possible to always hear a comfortable sound that makes the occupant feel sporty without feeling uncomfortable.
[0013]
According to a third aspect of the present invention, in the second aspect of the invention, the traveling state detecting means has a vehicle speed detecting means for detecting a traveling speed of the vehicle, and the control means controls the traveling speed of the vehicle by the vehicle speed detecting means to a predetermined speed. It is assumed that the first control mode is executed when the following is detected.
[0014]
Accordingly, when the traveling speed (vehicle speed) of the vehicle is equal to or lower than a predetermined speed (a speed at which the engine speed becomes, for example, 5000 rpm (for example, 140 km / h)), the engine-related sound that can be heard by the occupant is made strong. This gives the occupant a sporty feeling even in a vehicle (especially a hybrid vehicle) in which the actual engine-related sound does not feel powerful when the output sound is not output despite the relatively high running performance such as acceleration performance. In addition to this, it is possible to suppress the occurrence of a sense of incongruity caused by the difference between the running feeling felt by the passenger and the feeling heard by the ear. In addition, even for a vehicle having very low running performance, the occupant can be given a sporty feeling and the occupant's satisfaction can be increased.
[0015]
According to a fourth aspect of the present invention, in the second aspect of the invention, the traveling state detecting means has a vehicle speed detecting means for detecting a traveling speed of the vehicle, and the control means controls the traveling speed of the vehicle by a predetermined speed by the vehicle speed detecting means. It is assumed that the second control mode is executed when it is detected that the value is larger than the second control mode.
[0016]
By doing so, when the vehicle speed is higher than a predetermined speed (for example, a speed at which the engine speed becomes 5000 rpm (for example, 140 km / h)), the engine-related sound that can be heard by the occupant is made clear and smooth, The occupant can be given a sense of quietness without giving a feeling of discomfort or lack of feeling caused by the sound being too low.
[0017]
According to a fifth aspect of the present invention, in the second aspect of the present invention, when the rotation speed of the engine of the vehicle increases in accordance with the shift change during the execution of the second control mode, the control means performs the predetermined time from the shift change. During the period, the first control mode is executed.
[0018]
Thus, when the engine speed increases with a shift change, the engine-related sound heard by the occupant is made to be a powerful sound, so that the occupant can be enhanced with a sporty feeling.
[0019]
According to a sixth aspect of the present invention, in the first aspect of the present invention, the control means includes: an even-order component in the frequency-order component of the engine-related sound heard by the occupant; an odd-order component and a half-order component whose orders are close to the even-order component. A first control mode for outputting an output sound for reducing the sound pressure difference from each of the components to the vehicle interior, and an output sound for increasing the sound pressure ratio for each of the odd-order component and the half-order component of the even-order component to the vehicle interior. A second control mode to be output, and an output sound for making the sound pressure of the even-order component substantially equal to that of the second control mode and increasing the sound pressure of each of the odd-order component and the half-order component into the vehicle interior. The third control mode to be output is switched and executed in accordance with the traveling state of the vehicle detected by the traveling state detecting means.
[0020]
According to the present invention, in the first control mode, the engine-related sound heard by the occupant can be made a powerful sound, in the second control mode, it can be made a clear and gentle sound, and in the third control mode, The sound is a sound that adds strength to a clear and smooth sound. With these three control modes, the engine-related sound heard by the occupant can be more finely controlled.
[0021]
According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the traveling state detecting means includes an acceleration detecting means for detecting an acceleration of the vehicle, and the control means controls whether the vehicle is in an accelerating state by the acceleration detecting means. It is assumed that the third control mode is executed when the acceleration is detected to be equal to or less than the predetermined value.
[0022]
In this way, when the vehicle is in a moderate acceleration state, the engine-related sound heard by the occupants can be given a clear and gentle sound by adding strength to give the occupants a quiet feeling while giving a quiet feeling of acceleration. it can.
[0023]
According to an eighth aspect of the present invention, in the second or sixth aspect of the present invention, when switching the control mode, the control means controls the sound pressure of the frequency order component of the engine-related sound that can be heard by the occupant, and the engine-related sound controls the control mode. It is assumed that the control mode after the switching is executed after the output sound to be changed so as to have the intermediate tone color before and after is output to the vehicle interior.
[0024]
This allows the occupant to hear a sound having an intermediate tone before and after the control mode switching before and after the switching, thereby suppressing a sudden sound change from occurring. It is possible to prevent discomfort caused by a sound change. In order to make the engine-related sound have an intermediate tone before and after the switching of the control mode, for example, the sound pressure of the even-order component is set to the same or close value as the control mode after the switching, and the odd-order component and the half-order component are set. Or the sound pressure of the even-order component is set to the same or close value as the control mode before the switching, and each of the odd-order component and the half-order component May be set to the same value as or close to the control mode after the switching.
[0025]
According to a ninth aspect of the present invention, in the invention of the eighth aspect, the control means controls the sound pressure of a frequency order component of the engine-related sound heard by the occupant when switching the control mode in accordance with the shift change. It is assumed that the control mode after the switching is executed without outputting an output sound which is changed so as to have an intermediate tone before and after the mode switching to the vehicle interior.
[0026]
That is, the sudden sound change accompanying the shift change does not give the occupant a great feeling of discomfort, and conversely, if the occupant is allowed to hear a sound having an intermediate tone before and after the control mode switching before and after the switching, The execution of the control mode is delayed, and the delay may give a sense of incongruity. However, according to the present invention, when the control mode is switched according to the shift change, the control mode after the switching is immediately executed, so that it is possible to prevent the occupant from feeling uncomfortable due to the delay in the execution.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a vehicle interior sound control device according to an embodiment of the present invention (FIG. 2 shows a state of attachment to a vehicle 1). An engine-related sound (such as an engine sound or an exhaust sound) generated due to the rotation of the engine of the vehicle 1 is controlled by the output sound to the vehicle interior.
[0028]
The control means for outputting the output sound from the speakers 11 disposed at the front, side and rear of the vehicle interior to the vehicle interior so as to change the engine-related sound as described later. The controller 10 is provided.
[0029]
A microphone 12 is embedded in the headrest 2 of each seat in the vehicle interior, and the sound collected by the microphone 12 is converted into a digital electric signal through an amplifier 13 and an A / D converter 14. The data is input to the controller 10. The microphone 12 is disposed at a position substantially coincident with the occupant's binaural position in the headrest 2 of each seat, whereby an electric signal corresponding to an engine-related sound heard by the occupant is input to the controller 10. Become.
[0030]
Further, the controller 10 is connected with an IG pulse detector 21 for detecting a signal synchronized with the engine rotation. The IG pulse detector detects, for example, rotation of a crankshaft, detection of ignition timing from an igniter, and the like. Is output as an IG pulse signal, and the IG pulse signal is input to the controller 10.
[0031]
Further, the controller 10 includes an engine speed sensor 22 for detecting the engine speed, a vehicle speed sensor 23 as vehicle speed detecting means for detecting the traveling speed (vehicle speed) of the vehicle 1, and a power train control for controlling the transmission. A module (PCM) 27 is connected, and output signals of these sensors 22 and 23 are input to the controller 10, and shift change information of the transmission is input from the PCM 27. The acceleration is calculated from the vehicle speed detected by the vehicle speed sensor 23, and the vehicle speed sensor 23 also constitutes an acceleration detecting means for detecting the acceleration of the vehicle.
[0032]
The controller 10 includes a reference signal generation unit 10a that generates a reference signal synchronized with the IG pulse signal from the input IG pulse signal, a reference signal generated by the reference signal generation unit 10a, and an electric signal from the microphone 12. And a speaker drive signal generator 10b that generates a speaker drive signal based on the signals, the output signals from the sensors 22 and 23, and the shift change information from the PCM 27. The speaker drive signal generated by the speaker drive signal generator 10b is output to the speaker 11 via the D / A converter 31 and the amplifier 32, so that the speaker 11 outputs an output corresponding to the speaker drive signal. Sound will be output to the vehicle interior.
[0033]
The processing of generating a speaker drive signal for causing the speaker 11 to output an output sound based on the reference signal in the speaker drive signal generation unit 10b of the controller 10 is performed by the noise reduction technique described in the section of the related art (Japanese Patent No. This is similar to 3278176 and Japanese Patent No. 3278185) and is omitted, but in the present embodiment, the sound collected by the microphone 12 (engine-related sound heard by the occupant) is canceled based on the reference signal. Rather than generating a speaker drive signal for causing the speaker 11 to output an output sound, a speaker drive signal for causing the speaker 11 to output an output sound that changes the sound pressure of a frequency order component of the engine-related sound heard by the occupant. Is different. The vehicle speed sensor 23 constitutes running state detecting means for detecting the running state of the vehicle 1, and according to the detected running state (vehicle speed and acceleration) of the vehicle 1, as described later, an occupant is provided to the occupant. The output sound that changes the sound pressure of the frequency order components (even-order component, odd-order component, and half-order component) of the audible engine-related sound is output from the speaker 11 to the vehicle interior. Note that it is not always necessary to input an electric signal from the microphone (perform feedback control), and it is also possible to perform open control.
[0034]
Here, what kind of output sound is to be output from the speaker 11 in the speaker drive signal generation unit 10b of the controller 10 according to the traveling state of the vehicle 1 will be described with reference to the control map of FIG. The “first control mode” in the control specification column in this control map includes an even-order component in the frequency-order component of the engine-related sound heard by the occupant, an odd-order component whose order is close to the even-order component, and This is a control mode in which an output sound for reducing the sound pressure difference from each of the half-order components is output to the vehicle interior. The “second control mode” is an odd-order component of the even-order component and a half-order component of the frequency order component. This is a control mode in which an output sound that increases the sound pressure ratio for each of the next components is output to the vehicle interior. The “third control mode” is a process in which the sound pressure of an even-order component is set with respect to the second control mode. This is a control mode in which output sounds that are substantially the same and increase the sound pressure of each of the odd-order component and the half-order component are output to the vehicle interior.
[0035]
When the vehicle 1 is stopped (parked), no control is performed, that is, the output sound is not output to the vehicle interior. When the vehicle speed is equal to or lower than a predetermined speed (a speed at which the engine speed becomes, for example, 5000 rpm (for example, 140 km / h)) (when the vehicle speed is low to medium), the first control mode is executed, and the vehicle speed is reduced. Is larger than the predetermined speed (when the speed is high), the second control mode is executed.
[0036]
Further, when the vehicle is in an accelerating state and the acceleration is equal to or lower than a predetermined value (during gentle acceleration except for traveling at a constant speed), the third control mode is executed, and when the acceleration is higher than the predetermined value ( At the time of sudden acceleration), the first control mode is executed, and at the time of deceleration braking (when negative acceleration is detected), the second control mode is executed.
[0037]
During the execution of the second control mode, if the rotation speed of the engine of the vehicle 1 increases with a shift change (shift up or down), the first control mode is maintained for a predetermined time after the shift change. Execute
[0038]
By the processing operation in the speaker drive signal generation unit 10b of the controller 10, the sound pressure of the frequency order component of the engine-related sound heard by the occupant in the room of the vehicle 1 changes according to the running state (vehicle speed and acceleration) of the vehicle 1. The output sound to be output is output from the speaker 11 to the vehicle interior.
[0039]
Specifically, at low to medium speeds where the vehicle speed is equal to or lower than a predetermined speed, an even-order component and an odd-order component and a half-order component whose orders are close to the even-order component in the frequency-order component of the engine-related sound heard by the occupant. An output sound for reducing the sound pressure difference between each of them is output to the vehicle interior. That is, the sound that can be heard by the occupant when the output sound is not output to the vehicle interior has, for example, a waveform as shown in FIG. 4, and a secondary component (the frequency of the secondary component is the engine output in a four-cylinder engine). When the number of rotations is Nrpm, it becomes N × 2/60 Hz). Then, as shown in FIGS. 5 and 6, for example, the order of the even-order component (i-th component (i = 2, 4, 6,...)) And the order of the even-order component are close due to the output of the output sound. The sound pressure difference between each of the odd-order component (i-1 order component, i + 1 order component) and the half order component (i-0.5 order component, i + 0.5 order component) is reduced (the sound pressure of the even order component is reduced). The sound pressure of each of the odd-order component and the half-order component may be decreased and the sound pressure of each of the odd-order component and the half-order component is increased, or the sound pressure of each of the odd-order component and the half-order component is increased. Alone). In particular, the sound of the secondary component and each of the odd-order components (first-order component, third-order component) and half-order components (1.5-order component, 2.5-order component) whose orders are close to the second-order component Reduce the pressure difference (preferably reduce the sound pressure of at least the secondary component). By doing so, the engine-related sound heard by the occupant becomes a slow and powerful sound, and the actual engine-related sound when the output sound is not output despite the relatively high running performance such as acceleration performance does not feel powerful. Even in a vehicle (especially a hybrid vehicle), it is possible to give the occupant a sporty feeling and to suppress the occurrence of a sense of incongruity caused by the difference in the occupant's running feeling from the body and the feeling from the ear. it can. In addition, even for a vehicle having very low running performance, the occupant can be given a sporty feeling and the occupant's satisfaction can be increased.
[0040]
On the other hand, when the vehicle speed is higher than a predetermined speed, as shown in FIGS. 7 and 8, for example, the sound pressure ratios of the even-order components to the odd-order components and the half-order components in the frequency-order components of the engine-related sound heard by the occupant. (The sound pressure of the even-order component may be increased and the sound pressure of each of the odd-order component and the half-order component may be decreased, and the sound pressure of the even-order component may be increased.) Or only the sound pressure of each of the odd and half order components may be reduced). In this way, the engine-related sound heard by the occupant is a clear and smooth sound, and the occupant can be given a sense of quietness without giving a feeling of discomfort or lack of sound due to the sound being too low.
[0041]
When the vehicle is in a moderate acceleration state, for example, as shown in FIGS. 9 and 10, the sound pressure of the even-order component in the frequency-order component of the engine-related sound heard by the occupant is set to be substantially the same as in the second control mode. In addition, an output sound that increases the sound pressure of each of the odd-order component and the half-order component in comparison with the second control mode is output to the vehicle interior. As a result, the engine-related sound heard by the occupant is a clear and mellow sound with added power, and the occupant can be given a sense of quiet acceleration while giving a quiet feeling.
[0042]
On the other hand, when the vehicle is in a rapid acceleration state, the first control mode is executed to give the occupant a sporty feeling, as well as the running feeling and the ear sensation felt by the occupant in the same manner as at the time of the low / medium speed. This suppresses the occurrence of a sense of incongruity caused by the difference between the above. Then, when the vehicle is in the deceleration braking state, the second control mode is executed as in the case of the above-described high speed to give the occupant a sense of quietness.
[0043]
In this manner, the first to third control modes (the first and second control modes depending on the vehicle speed) are executed in accordance with the running state (vehicle speed and acceleration) of the vehicle 1. When the control mode is switched, the sound pressure of the frequency order component of the engine-related sound that can be heard by the occupant is not executed instead of executing the control mode after the switch, and the engine-related sound is an intermediate tone before and after the control mode is switched. After the output sound to be changed so as to be output to the vehicle interior, the control mode after the switching is executed. In order to make the engine-related sound have an intermediate tone before and after the control mode switching, for example, the sound pressure of the even-order component is set to the same or close value as the control mode after the switching, and the odd-order component and the half-order component are set to the same value. Each sound pressure is set to the same or close value as the control mode before switching, or the sound pressure of the even-order component is set to the same or close value as the control mode before switching and each of the odd-order component and the half-order component is set. The sound pressure may be set to the same value as or close to the control mode after the switching. For example, when switching from the first control mode to the second control mode, as shown in FIG. 11, the sound pressure of the even-order component is set to the same or close value as the control mode after the switching (second control mode), and The sound pressure of each of the odd-order component and the half-order component is set to the same value as or close to the control mode before the switching (first control mode), or as shown in FIG. A value equal to or close to the control mode before switching (first control mode) and the sound pressure of each of the odd-order component and the half-order component are set to the same value or close to the control mode before switching (second control mode). I do. By doing so, at the time of control mode switching, it is possible to make the occupant hear an engine-related sound having an intermediate tone before and after the control mode switching, and as a result, it is possible to suppress a sudden change in sound, It is possible to prevent the occupant from feeling uncomfortable due to such a sudden change in sound. However, when the control mode is switched according to the shift change, the control mode immediately after the switch is executed without changing the engine-related sound to an intermediate tone before and after the control mode switching. This can prevent the occupant from feeling uncomfortable due to the delay in the execution of the control mode after the switching.
[0044]
Therefore, the sound pressure of the frequency order component of the engine-related sound that can be heard by the occupant in the cabin of the vehicle 1 is changed according to the traveling state of the vehicle 1 (vehicle speed and acceleration in the present embodiment). Thus, a sound suitable for the running state can be heard, and a comfortable sound that gives a sense of sporty without feeling uncomfortable can always be heard.
[0045]
The control mode is not limited to the first to third control modes, and the sound pressure of the frequency order component of the engine-related sound that can be heard by the occupant is changed according to the running state of the vehicle, so that the occupant is comfortable. Any control mode may be used as long as sound can be heard.
[0046]
The traveling state of the vehicle 1 is not limited to the vehicle speed and the acceleration, but may be other than these, for example, a steering state of the vehicle 1 (detected by a steering angle detecting unit that detects a steering angle of the steering wheel of the vehicle 1). Road environment conditions (detected by inputting information from a navigation device, an ABS control module, etc.), the distance between the vehicle and the preceding vehicle traveling in front of the vehicle 1 (vehicle distance for detecting the distance between the vehicle and the preceding vehicle) (Detected by the distance detecting means). In this case, the output sound may be output from the speaker 11 according to the control map of FIG. 13 (which may be used in combination with the control map of FIG. 3).
[0047]
【The invention's effect】
As described above, according to the vehicle interior sound control device of the present invention, the sound pressure of the frequency order component of the engine-related sound that can be heard by the occupant is changed according to the running state of the vehicle. According to the state, the occupant can be given a sense of quietness and sportiness, and can always hear a pleasant sound that gives a sense of sporty without feeling uncomfortable.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a vehicle interior sound control device according to an embodiment of the present invention.
FIG. 2 is a schematic view showing a state in which the vehicle interior sound control device is mounted on a vehicle.
FIG. 3 is a diagram showing a control map for control performed by a speaker drive signal generation unit of the controller.
FIG. 4 is a diagram showing a waveform of an engine-related sound that can be heard by an occupant when the output sound is not output to the vehicle interior.
FIG. 5 is a diagram showing a waveform of an engine-related sound that can be heard by an occupant when a first control mode is executed.
FIG. 6 is a diagram showing a sound pressure of a frequency order component of an engine-related sound that can be heard by an occupant when a first control mode is executed.
FIG. 7 is a diagram illustrating a waveform of an engine-related sound that can be heard by an occupant when a second control mode is executed.
FIG. 8 is a diagram illustrating the sound pressure of a frequency order component of engine-related sound that can be heard by an occupant when a second control mode is executed.
FIG. 9 is a diagram showing a waveform of an engine-related sound heard by an occupant when a third control mode is executed.
FIG. 10 is a diagram showing a sound pressure of a frequency order component of an engine-related sound that can be heard by an occupant when a third control mode is executed.
FIG. 11 is a diagram illustrating an example of a sound pressure of a frequency order component for converting an engine-related sound heard by an occupant into an intermediate tone between the first and second control modes.
FIG. 12 is a diagram showing another example of the sound pressure of the frequency order component for making the engine-related sound heard by the occupant a tone intermediate between the first and second control modes.
FIG. 13 is a diagram showing an example of another control map.
[Explanation of symbols]
1 vehicle
10 controller (control means)
11 Speaker
12 microphones
21 IG pulse detector
23 Vehicle speed sensor (running state detecting means)
(Vehicle speed detecting means) (Acceleration detecting means)

Claims (9)

A vehicle interior sound control device that controls an engine-related sound, which is heard by an occupant in the vehicle interior and is generated with the engine rotation of the vehicle, by an output sound to the vehicle interior,
Traveling state detection means for detecting the traveling state of the vehicle,
Control means for outputting the output sound to the passenger compartment in order to change the sound pressure of the frequency order component of the engine-related sound heard by the occupant in accordance with the running state of the vehicle detected by the running state detecting means. A vehicle interior sound control device, characterized in that: The vehicle interior sound control device according to claim 1,
The control means outputs, to the vehicle, an output sound that reduces the sound pressure difference between the even-order component and the odd-order component and the half-order component whose order is close to the even-order component in the frequency-order component of the engine-related sound heard by the occupant. A traveling state detecting means includes: a first control mode for outputting to the passenger compartment; and a second control mode for outputting, to the passenger compartment, an output sound for increasing a sound pressure ratio of each of the odd-order component and the half-order component of the even-order component. The vehicle interior sound control device is configured to be switched and executed according to the running state of the vehicle detected by the vehicle. The vehicle interior sound control device according to claim 2,
The traveling state detecting means has a vehicle speed detecting means for detecting a traveling speed of the vehicle,
The control means is configured to execute a first control mode when the vehicle speed detection means detects that the running speed of the vehicle is equal to or lower than a predetermined speed. . The vehicle interior sound control device according to claim 2,
The traveling state detecting means has a vehicle speed detecting means for detecting a traveling speed of the vehicle,
The control means is configured to execute a second control mode when the vehicle speed detection means detects that the running speed of the vehicle is higher than a predetermined speed. . The vehicle interior sound control device according to claim 2,
The control means is configured to execute the first control mode for a predetermined time after the shift change when the engine speed of the vehicle increases with the shift change during the execution of the second control mode. A vehicle interior sound control device, comprising: The vehicle interior sound control device according to claim 1,
The control means outputs, to the vehicle, an output sound that reduces the sound pressure difference between the even-order component and the odd-order component and the half-order component whose order is close to the even-order component in the frequency-order component of the engine-related sound heard by the occupant. A first control mode for outputting to the passenger compartment, a second control mode for outputting an output sound for increasing the sound pressure ratio of each of the odd-order component and the half-order component of the even-order component to the vehicle interior, and the second control A third control mode for making the sound pressure of the even-order component substantially the same as the mode and increasing the sound pressure of each of the odd-order component and the half-order component into the vehicle interior; The vehicle interior sound control device is configured to be switched and executed according to the running state of the vehicle detected by the vehicle. The vehicle interior sound control device according to claim 6,
The traveling state detecting means has an acceleration detecting means for detecting an acceleration of the vehicle,
The control means is configured to execute a third control mode when the acceleration detection means detects that the vehicle is in an acceleration state and the acceleration is equal to or less than a predetermined value. Vehicle interior sound control device. The vehicle interior sound control device according to claim 2 or 6,
The control means changes the sound pressure of the frequency order component of the engine-related sound heard by the occupant when switching the control mode so that the engine-related sound has an intermediate tone before and after the control mode switching. The vehicle interior sound control device is configured to execute a post-switching control mode after output to the vehicle interior. The vehicle interior sound control device according to claim 8,
When the control mode is switched according to the shift change, the control means changes the sound pressure of the frequency order component of the engine-related sound heard by the occupant so that the engine-related sound has an intermediate tone before and after the control mode switching. A vehicle interior sound control device configured to execute a control mode after switching without outputting sound to a vehicle interior.

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