JPH07152385A - Noise controller - Google Patents

Abstract

PURPOSE:To provide a noise controller capable of muffling a noise of an engine by interfering a control sound by an actuator for the noise which the engine generates and making the noise outside and inside a car a required sound characteristic by working the noise to the sound provided with a required characteristic. CONSTITUTION:The actuator 6 arranged on the sound source side of the noise in the vicinity of a route where the noise radiated by a vehicle propagates outside and inside the vehicle is provided in the noise controller, and a controller 4 connected to the actuator 6 forms a control waveform signal for radiating the control sound controlling the noise to the actuator 6, and sensors 1, 2 connected to the controller 4 obtain e.g engine rotation information and engine load information required the controller 4 to generate the control waveform signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention interferes control noise generated by an engine with noise generated by an engine to muffle engine noise or process the noise to have a desired characteristic.
The present invention relates to a noise control device that can make noise outside and inside a vehicle have desired sound characteristics.

[0002]

2. Description of the Related Art Conventionally, in a noise control device in such a field, in order to add a control sound to noise, a method of arranging an actuator in the vicinity of a sound source and an attempt to obtain a control effect not in the vicinity of the sound source are attempted. There is a method of arranging the actuator in the vicinity of the position to be used.

[0003]

However, in the former case, for an object having a large number of sound sources, such as an automobile,
Since a large number of actuators are arranged, there is a problem that space is difficult. The latter has a problem that since the control sound and the control sound propagate differently, the range in which the control effect can be obtained is narrowed, and the noise due to the control sound increases outside the range.

Therefore, in view of the above problems, it is an object of the present invention to provide a noise control device which can obtain a control effect in a wide range by a small number of actuators.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a noise control device is arranged on the sound source side of the noise in the vicinity of a route through which noise emitted from the vehicle propagates outside or inside the vehicle. And a controller connected to the actuator forms a control waveform signal for causing the actuator to emit a control sound for controlling the noise, and a sensor connected to the controller outputs the control waveform signal to the control waveform signal. Obtain, for example, engine rotation information and engine load information needed to cause the controller to generate.

[0006]

According to the noise control device of the present invention, an actuator arranged on the sound source side of the noise is provided in the vicinity of the path through which the noise emitted from the vehicle propagates outside or inside the vehicle, and the control for controlling the noise is provided. A control waveform signal is formed for causing a sound to be emitted to the actuator, and the control waveform signal is generated by the actuator by obtaining information required for generating the control waveform signal.
It is converted into the control sound to control the noise. As a result,
Noise generated from many sound sources such as an engine can be controlled by an actuator corresponding to a small number of transmission paths. Inside and outside the vehicle, noise and control sound from the actuator are radiated through the same transmission path, so that both can propagate. Will be the same and can be controlled in a wide range.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining the outline of an embodiment of the present invention. As shown in this figure, in order to reduce the vehicle interior noise, the noise generated from multiple sound sources such as the engine of the automobile is mainly transmitted to the vehicle interior noise via the dash panel section. Focusing on 71, one actuator 6 near the dash panel in the engine room
By arranging and controlling, the control effect is obtained in a wide range in the vehicle interior. Here, since noise and control sound are transmitted in the same path in the passenger compartment, a stable effect can be obtained over a wide range even when the passenger's presence or absence changes due to changes in the passenger's head position. Can also handle.

Further, with respect to the noise outside the vehicle, a control effect can be obtained on the noise radiated to the outside of the vehicle from the vicinity of the dash panel portion in the engine room, through the opening in the rear of the tire and the like. In the control of noise outside the vehicle, an intake port, a radiator grille, an opening near a tire, an exhaust port, and the like are given as transmission paths. As described above, the noise control device of the present invention arranges the actuator on the sound source side of the main transmission path where the noise emitted from the engine of the automobile becomes the exterior noise or the interior noise. Thus, the noise generated from many sound sources such as automobile engines can be controlled by the actuators corresponding to a small number of transmission paths.
Since the noise and the control sound from the actuator are radiated from the same transmission path, the two propagate in the same way, and the control effect can be obtained in a wide range.

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a diagram showing a noise control device according to an embodiment of the present invention, which is for noise in a vehicle compartment. Normally, in an engine that is electronically controlled, an engine rotation sensor 1 is provided in a distributor or the like, and an engine load sensor 2 such as an intake negative pressure sensor, an air flow meter, or an accelerator opening sensor is provided as shown in the figure.
Is provided and each output signal is taken into the engine control unit 3. Next, the controller 4 is connected to the engine control unit 3 by a signal line for transmitting engine rotation information and engine load information.

FIG. 3 is a diagram for explaining the controller 4 of FIG. As shown in the figure, in the controller 4, the engine rotation pulse is input to the waveform shaping circuit 41, and the multiplication circuit 42, the low-pass filter 43, and the phase control circuit 4 are input to this.
4. The amplitude control circuit 45 is connected in this order so that the control waveform signal is finally output. At this time, the phase control amount of the phase control circuit 44 and the amplitude control circuit 4
The amplitude control amount of 5 is determined by the CPU 46 by reading the map information in the memory 47 based on the engine rotation signal and the engine load signal. Further, the actuator 6 is connected to the controller 4 via the amplifier 5 by a signal line transmitting a control waveform. Here actuator 6
Is installed on the sound source side of the propagation path 71 of the noise in the engine room into the vehicle interior, that is, in the vicinity (in the engine room) 70 of the dash panel 80 that separates the engine room 7 from the vehicle interior 8.

FIG. 4 is a diagram showing map information stored in the memory 47 of FIG. In this embodiment, engine rotation 2 of a four-cylinder engine which causes a problem of muffled sound in the passenger compartment
Secondary components (primary components of explosion) are reduced. First, a dash panel 80 that separates the engine room 7 from the vehicle compartment 8
The sound pressure level and phase of the engine room noise (engine secondary component) in the vicinity 70 (in the engine room) of 70 are determined by the engine speed and the engine load, and are therefore reduced as shown in FIG. The phase control amount and the amplitude control amount of the control sound are stored in the memory 47 as map information having the engine speed and the engine load as parameters.

The operation of the controller 4 constituting the noise control device as described above will be described below. As shown in FIG. 3, the engine rotation pulse has a waveform shaping circuit 41.
The noise is removed by, and multiplied by the multiplying circuit 42, and becomes a pulse of the engine rotation secondary component. Next, the low-pass filter 43 removes the harmonic component to form a sine wave of the engine rotation secondary component, and the phase control circuit 44 and the amplitude control circuit 45 control the phase and amplitude to form a control waveform signal.

FIG. 5 shows the phase control amount and the amplitude control amount by the CPU 46 shown in FIG.
6 is a flowchart for setting to 5. As shown in the figure, in step S400, the engine speed and the engine load information are fetched.

In step S401, it is determined whether or not the rotational speed and the load have changed. In step S402, map information reading corresponding to the rotation speed and the load is performed. In step S403, the phase control amount read by the phase control circuit 44 is set. In step S404, the amplitude control amount read out by the amplitude control circuit 45 is set.

In step S405, the above procedure is repeated until the control is completed. Further, in FIG. 2, the control waveform signal output from the controller 4 is converted by the actuator 6 via the amplifier 5, and the sound source side of the propagation path 71 of the noise in the engine room to the vehicle interior,
That is, in the engine room 70 near the dash panel 80 that separates the engine room 7 from the vehicle room 8, the control sound cancels the noise in the engine room 70.

As a result, the noise in the engine room and the control sound propagate through the same route in the passenger compartment, and the sounds propagated by the two cancel each other out in a wide range, and a reduction effect can be obtained in a wide range. FIG. 6 is a diagram showing a noise control device according to another embodiment of the present invention, which is for noise outside the vehicle (left side surface). In another embodiment shown in the figure, the actuator 6 causes the noise in the engine room to propagate outside the vehicle (left side surface) 91 to the sound source side of the propagation path 72, that is, the opening 73 near the left tire.
The point installed in the engine room 74 near the
Different from the embodiment of FIG. Therefore, the map information of the controller 4 is the information of the phase control amount and the amplitude control amount of the control sound that reduces the engine rotation secondary component of the engine room noise in the engine room 74 near the opening 73 near the left front tire. Therefore, the control sound emitted by the actuator 6 cancels out the noise in the engine room 74 in the engine room 74 near the opening 73 near the left tire. As a result, outside the vehicle (left side) 91
Then, the noise in the engine room 74 and the control sound are propagated through the same route, and the reduction effect can be obtained in a wide range. Further, as easily expected from this embodiment, in order to obtain the reduction effect on the outside (right side surface) 92, the actuator 6 should be installed in the engine room 76 near the opening 75 near the right front tire. It is valid.

FIG. 7 is a diagram showing a noise control device according to another embodiment of the present invention, which is for noise outside the vehicle (front surface). In another embodiment shown in this figure, the actuator 6 is installed on the sound source side of the propagation path 77 of the noise in the engine room to the outside (front) 93, that is, in the engine room 79 near the front grille opening 78. The point is different from the embodiment of FIG. Similarly to the above-described embodiment, the control sound emitted from the actuator 6 is transmitted to the inside of the engine room 7 in the engine room 79 near the front grille opening 78.
By canceling the noise of 9, the noise in the engine room 79 and the control sound will propagate along the same path outside the vehicle (front) 93, and a reduction effect can be obtained in a wide range.

In the above embodiments, based on the map information using the engine speed and the engine load as parameters,
Although the method of obtaining the control signal for reducing the secondary component of engine rotation is a method of obtaining the control signal, it may be a method of controlling noise at the position where the actuator 6 is arranged, that is, at the sound source side of the noise propagation path. For example, a method of controlling another order component or a method of performing feedback control may be used.

The arrangement of the actuator 6 is not limited to the position shown in the embodiment, either.
If the route through which the noise emitted from the vehicle propagates outside or inside the vehicle is determined, it may be set to the sound source side near the route.

[0020]

As described above, according to the present invention, an actuator arranged on the sound source side of noise is provided in the vicinity of the route through which the noise emitted by the vehicle propagates outside or inside the vehicle to control the noise. Since the control waveform signal for emitting the control sound to the actuator is formed and the information necessary for generating the control waveform signal is obtained, the control waveform signal becomes the control sound for controlling the noise in the actuator. By being converted, noise generated from many sound sources such as the engine can be controlled by the actuator corresponding to a small number of transmission paths, and noise inside and outside the vehicle and control sound from the actuator are radiated through the same transmission path. Both can be propagated in the same way and can be controlled in a wide range.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an outline of points of interest of the present invention.

FIG. 2 is a diagram showing a noise control device according to an embodiment of the present invention, which is for noise in a vehicle compartment.

FIG. 3 is a diagram illustrating a controller 4 of FIG.

FIG. 4 is a diagram showing map information stored in a memory 47 of FIG.

5 is a flowchart for setting a phase control amount and an amplitude control amount by a CPU 46 of FIG. 3 in a phase control circuit 44 and an amplitude control circuit 45.

FIG. 6 is a diagram showing a noise control device according to another embodiment of the present invention, which is for noise outside the vehicle (left side surface).

FIG. 7 is a diagram showing a noise control device according to another embodiment of the present invention, which is for a vehicle exterior noise (front surface).

[Explanation of symbols]

 6 ... Actuator 7 ... Engine room 8 ... Vehicle room 73 ... Opening near left front tire 75 ... Opening near right front tire 78 ... Front grille opening

Front page continued (72) Inventor Kataka Nishio 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor Katsuyuki Tanaka 1-1-cho, Showa-cho, Kariya city, Aichi prefecture Nidec Corporation (72) Inventor Tokio Obama 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (72) Inventor Masanori Kato 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Stock company Japan Auto Parts Research Institute

Claims (4)

[Claims] 1. An actuator arranged on the sound source side of the noise in the vicinity of a path through which the noise emitted from the vehicle propagates outside or inside the vehicle, and control for causing the actuator to emit a control sound for controlling the noise. A noise control device, comprising: a controller that forms a waveform signal; and a sensor that obtains information required to cause the controller to generate the control waveform signal. 2. The noise control device according to claim 1, wherein the actuator is arranged in the engine room of the vehicle and near a dash panel that separates the engine room from the vehicle interior. 3. The noise control device according to claim 1, wherein the actuator is arranged in an engine compartment near an opening near a left front tire with respect to a side surface outside the vehicle. 4. The noise control device according to claim 4, wherein the actuator is arranged in the engine compartment near the front grille opening with respect to the front surface outside the vehicle.