JPH05224679A - Vibration controller for vehicle - Google Patents

Abstract

PURPOSE:To obtain an excellent noise control result in a short time by synchronizing the opposite-phase sound of a storage device with a noise according to the output of a phase detection sensor which detects the angle of rotation of an engine when the engine is restarted. CONSTITUTION:The vehicle vibration controller 10 consists of a period detection sensor 1 which detects the period and phase of vibration, the phase detection sensor 6, a speaker 2 which generates 2nd vibration (opposite-phase sound) for reducing the energy of the vibration, a microphone 3 which detects the noise in the cabin of the automobile, a controller 4 which sets the vibration energy of the opposite-phase sound, a storage device storing the opposite-phase sound, and a period device which synchronizes the opposite-phase sound with the noise. When the engine 2 is stopped and then restarted, the output of the phase detection sensor 6 is used to synchronize the opposite-phase sound stored in the storage device with the noise by a synchronizing device. Therefore, the calculation for noise control need not be redone from the beginning and the stored opposite-phase sound of 2nd vibration is usable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle vibration control device installed in a vehicle for reducing periodic vibration generated by a vibration source such as a vehicle engine.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Publication No. 1-501344, for example, a periodic first vibration (hereinafter referred to as noise) generated by rotation of an engine of a vehicle (first vibration source). The vehicle vibration control device for generating the second vibration that reduces the vibration energy of 1) generates the second vibration by the following method.

First, as shown in FIG. 9, in a reference signal generator 31, an ignition pulse (hereinafter referred to as IG) is generated on the primary coil side 24a of the ignition coil 24.
(Referred to as a pulse), the reference signal generator 31 generates a reference signal from the IG pulse, and inputs the reference signal to the controller 32.

The ignition coil 24 sequentially sends an IG pulse to a spark plug (not shown) in each cylinder of the in-line four-cylinder engine 22 via the distributor 40 to rotate the engine 22.

In the controller 32, the reference signal is introduced into the built-in adaptive filter, and the noise and the anti-phase sound (second vibration) reproduced by the speaker (not shown) installed in the cabin of the automobile are opposite in phase. Then, the gain and phase of the reference signal are adjusted so as to cancel each other out, and the reference signal is input to the speaker as a speaker input signal.

On the other hand, in the controller 32, the reference signal is input to the built-in algorithm calculation device, and at the same time, a microphone output signal output from a microphone (not shown) for detecting noise in the cabin of the automobile is introduced to the algorithm calculation device. Then, the filter coefficient of the adaptive filter incorporated in the controller 32 is sequentially calculated and optimized so that the level of the microphone output signal becomes low.

In this way, the conventional vehicle vibration control device reduces the noise by generating the antiphase sound for reducing the vibration energy of the noise by the speaker (not shown) or the like.

[0008]

However, in the above conventional control method, since the IG pulse is detected on the primary coil side of the ignition coil, the controller can recognize the engine rotation cycle, but the detected IG pulse is not detected. It is not possible to determine which cylinder of the engine was sent. That is, the controller cannot recognize the rotation angle of the engine.

Therefore, as shown in FIGS. 10 and 11, for example, the phase difference between the phase of the noise immediately before the stop (that is, the rotation angle of the engine) and the phase of the reference signal is 90 °.
However, if the phase difference between the noise phase and the reference signal phase becomes 270 ° after restart, the controller does not recognize the rotation angle of the engine. Even if the noise control is performed by using the anti-phase sound of the reference signal adjusted by the above filter coefficient, the noise cannot be reduced.

Therefore, when the engine is restarted after being stopped, the phase difference between the phase of the noise after the restart (engine rotation angle) and the phase of the reference signal is determined by the phase of the noise immediately before the engine is stopped and the reference signal. Since the phase difference is different from the phase difference with the above, the conventional control method described above cannot generate an antiphase sound using the filter coefficient calculated by the algorithm calculation device immediately before the engine is stopped.

Therefore, when the engine is restarted,
The algorithm calculation device has to repeat the calculation for obtaining the filter coefficient of the adaptive filter from the beginning, and in the conventional control method, it takes time to obtain the same control result as before the engine stop.

[0012]

In order to solve the above-mentioned problems, a vehicle vibration control system according to the present invention is a vehicle vibration control system for reducing periodic first vibration generated by a first vibration source. A second vibration source that generates a second vibration that reduces the vibration energy of the first vibration; a storage unit that stores the second vibration; a phase detection unit that detects the phase of the first vibration; When the one vibration source is stopped and then restarted, a synchronization unit that synchronizes the second vibration stored in the storage unit by the output of the phase detection unit is provided.

[0013]

In the above construction, the phase of the first vibration is detected by the phase detecting means, so that when the first vibration source is restarted after being stopped, the second vibration stored in the storage means is detected by the synchronizing means. It can be synchronized with one vibration. Therefore, it is not necessary to redo the calculation for performing the vibration control from the beginning, and the second vibration stored in the storage unit can be used, so that a good control result can be obtained in a short time.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS. In this embodiment, the case where the vehicle vibration control device is installed in a four-seater vehicle will be described as an example.

As shown in FIG. 6, the vehicle vibration control apparatus 10 according to the present embodiment is connected in series as a first vibration source for generating a periodic first vibration mounted on an automobile 21, which is a vehicle, for example. It is provided for a four-cylinder engine 22. This periodic vibration generates periodic noise (hereinafter referred to as noise), which is generated by the engine 22.
Is transmitted through the body of the automobile 21 and the like, and is generated by vibrating air by, for example, the vibration of equipment in the cabin 25. The rotation angle of the engine 22 and the phase of noise have a functional relationship.

The vehicle vibration control device 10 includes a cycle detecting sensor 1 for detecting a cycle of vibration, a phase detecting sensor 6 (phase detecting means) for detecting a phase of the vibration, and a vibration energy of the vibration. Five speakers 2 that generate two vibrations (hereinafter referred to as antiphase sounds) ... (Second vibration source)
, Eight microphones 3 installed in the cabin 25 of the automobile 21 for detecting noise at the installation point, a controller 4 for setting the vibration energy of the antiphase sound, and the controller 4 built in the controller 4 It comprises a storage device (storage means) (not shown) for storing the phase sound and a synchronization device (synchronization means) (not shown) for synchronizing the antiphase sound with noise.

As shown in FIG. 1, the cycle detecting sensor 1
Is disposed on the primary coil side 24a of the ignition coil 24 installed in the engine room 23 of the automobile 21, detects an ignition pulse (hereinafter referred to as IG pulse) sent to the engine 22, and detects the ignition pulse of the engine 22. The rotation cycle is measured, and the result is input to a reference signal generator (not shown) as a digital signal.
The reference signal generator generates a reference signal from this digital signal and inputs it to the controller 4. In addition, the cycle detection sensor 1 includes an ignition coil 2
By arranging the IG pulse on the primary coil side 24a of No. 4, it is possible to detect the IG pulse with lower voltage and more accurately than when arranging on the secondary coil side 24b.

The ignition coil 24 sequentially sends an IG pulse to a spark plug (not shown) in each cylinder of the in-line four-cylinder engine 22 via the distributor 7 to rotate the engine 22.

The phase detection sensor 6 is arranged between the distributor 7 installed in the engine room 23 of the automobile 21 and a spark plug (not shown) of the first cylinder 22a of the engine 22. The IG pulse sent to the cylinder 22a is detected, the rotation angle of the engine 22 is measured, and the result is input to the controller 4 as a digital signal.

As shown in FIG. 6, the speakers 2 ...
Five of them are installed in the cabin 25 of the automobile 21, four of which are arranged near the ears of the occupants seated in the seats 26, and the other one is arranged above the vicinity of the windshield. .. And these five speakers 2 ...
As will be described later, reproduces a digital speaker input signal input from the controller 4 as an antiphase sound and causes it to flow into the cabin 25 of the automobile 21.

Eight microphones 3 are installed in the cabin 25 of the automobile 21 and are arranged near the ears of the occupants seated in the seats 26, for example, so as to be embedded in the seats 26. ing. Then, these eight microphones 3 ... Detect noise at the installation point and use the result as a digital microphone output signal.
To enter. In this case, the noise at the installation location is
It shows noise that is canceled by the vibration energy of the antiphase sound and the vibration energy is reduced.

The controller 4 is installed below the vicinity of the windshield, and sets the vibration energy of anti-phase sound for reducing the vibration energy of noise by an adaptive filter and an algorithm arithmetic unit (not shown), and the speaker 2 ... To enter. Further, the controller 4 is an LSI (Lar
ge Scale Integrated Circuit) and other storage devices and synchronization devices.

In the controller 4, the reference signal is introduced into the built-in adaptive filter, and the noise and the antiphase sound reproduced by the speakers 2 installed in the cabin 25 of the automobile 21 become antiphase with each other. The gain, phase, etc. of the reference signals are adjusted so as to cancel each other, and the speaker signals are input to the speakers 2 as a speaker input signal.

On the other hand, in the controller 4, the reference signal is input to the built-in algorithm operation device, and at the same time, the microphone operation signal output from the microphones 3 for detecting noise in the cabin 25 of the automobile 21 is used as the algorithm operation device. The filter coefficient of the adaptive filter incorporated in the controller 4 is sequentially calculated and optimized so that the level of the microphone output signal becomes low.

The storage device stores the filter coefficient of the adaptive filter calculated by the algorithm calculation device immediately before the engine 22 is stopped when the engine 22 is stopped. The filter coefficient of the adaptive filter stored in this storage device is read by the algorithm calculation device when the engine 22 is restarted, and is used when restarting the calculation of the algorithm.

When the engine 22 is restarted, the synchronizer generates a noise based on the digital signal input from the phase detection sensor 6 and the filter coefficient of the adaptive filter read from the storage device. Synchronize with the opposite phase sound.

The speaker 2 of the vehicle vibration control device 10
... and the controller 4 can be shared with an audio device (not shown) such as a stereo, and switching of the device and on / off of the vehicle vibration control device 10 are performed by the automobile 2
This is performed by the operation switch 5 installed in the cabin 25 of No. 1.

A method of reducing the vibration energy of noise when the engine 22 is restarted after being stopped by using the vehicle vibration control apparatus 10 having the above-described configuration will be described below with reference to FIGS. 2 to 5. In order to simplify the description, an arbitrary pair of microphones 3 and speakers 2 is selected from a plurality of microphones 3 ...

First, as shown in FIG. 2, the vehicle vibration control device 10 detects the phase between the distributor 7 and the ignition plug of the first cylinder 22a of the engine 22 after the engine 22 is restarted. Based on the digital signal input from the sensor 6, it is determined whether the IG pulse is input to the ignition plug of the first cylinder 22a of the engine 22 (step 1), and the IG pulse is input to the ignition plug of the first cylinder 22a. Then, the noise control is started (step 2).

As shown in FIG. 3, for example, the engine 22
A case will be described where noise having the same cycle as the rotation cycle (hereinafter referred to as “primary noise”) is reduced. Engine 2
Before the second stop, it is assumed that the phase difference between the phase of the primary noise and the phase of the reference signal that generates the antiphase sound that reduces the primary noise is 90 °. When the engine 22 is stopped, the storage device built in the controller 4 stores the filter coefficient of the adaptive filter that generates the antiphase sound. The primary noise and the reference signal for generating the antiphase sound are synchronized with each other by the digital signal input from the phase detection sensor 6.

Then, when the engine 22 is restarted, the algorithm calculation device incorporated in the controller 4 reads out the filter coefficient of the adaptive filter for generating the antiphase sound before the engine 22 is stopped, from the storage device. When the digital signal input from the phase detection sensor 6 detects that the IG pulse is input to the ignition plug of the first cylinder 22a, the synchronizer built in the controller 4 generates a primary noise and an antiphase noise. Synchronize with the reference signal.

Then, the phase difference of 90 ° between the phase of the primary noise and the phase of the reference signal for generating the antiphase sound for reducing the primary noise does not change before and after the engine 22 is stopped.

Therefore, the algorithm calculation device incorporated in the controller 4 can restart the calculation of the algorithm by using the filter coefficient of the adaptive filter for generating the antiphase sound before the engine 22 is stopped, which is read from the storage device. .. Therefore, a good control result can be obtained in a short time as compared with the case where the calculation of the algorithm for performing noise control is restarted from the beginning.

Similarly, for example, as shown in FIG. 4, when noise having a period twice as long as the rotation period of the engine 22 is reduced, or as shown in FIG. Even when reducing noise having a half length cycle, the synchronizing device incorporated in the controller 4 synchronizes these noises with a reference signal for generating an anti-phase sound, so that the algorithm operation device is a storage device. The calculation of the algorithm can be restarted by using the filter coefficient of the adaptive filter that generates the antiphase sound before the engine 22 is stopped, which is read from the. Therefore, a good control result can be obtained in a short time as compared with the case where the calculation of the algorithm is restarted from the beginning.

Even if the phase difference between the phase of the noise and the phase of the reference signal for generating the anti-phase sound for reducing the noise is other than 90 °, a good control result can be similarly obtained in a short time.

The vehicle vibration control device 10 having the above-mentioned configuration.
Refers to the vehicle vibration control device 10 in the cabin 2 of the automobile 21.
Even when the operation switch 5 installed in the switch 5 is turned off and then turned on again, the same control as when the engine 22 is stopped and restarted is performed to reduce the vibration energy of noise in a short time. Can be made

Next, as another embodiment of the present invention, instead of the speaker 2 of the vehicle vibration control device 10 having the above-described structure, the engine 22 is installed in the engine installation portion 21a of the automobile 21, as shown in FIG. The vehicle mount vibration control device may have a configuration in which an actuator (not shown) is provided on the engine mount 28 used for installation.

This actuator is composed of, for example, a cylinder and a piston, and has a structure in which the engine 22 installed on the piston is supported by the hydraulic pressure of the oil filled in the cylinder. Then, due to the vibration of the engine 22,
For example, when the pushing force is applied to the piston, the oil in the cylinder is discharged to the outside of the cylinder, and when the pulling force is applied to the piston, the oil is inserted into the cylinder. Is controlled so that the vibration energy of the engine 22 is absorbed and the vibration of the engine 22 is not transmitted to the engine installation portion 21a of the automobile 21.

Further, as another embodiment of the present invention, in place of the speakers 2 of the vehicle vibration control apparatus 10 having the above-mentioned structure, as shown in FIG. Instead, the vehicle vibration control device may be configured such that the acceleration sensor 29 is provided in the engine installation portion 21a of the automobile 21.

The acceleration sensor 29 detects the vibration of the engine 22 by measuring the acceleration of the automobile 21.

Then, the vibration detected by the acceleration sensor 29 is analyzed by the controller 4, and on the basis of this result, the controller 4 controls the oil in and out of the cylinder of the actuator to absorb the vibration energy of the engine 22, The vibration of the engine 22 is not transmitted to the engine installation portion 21a of the automobile 21.

As described above, the vehicle vibration control device having the above-described structure is the synchronizing device built in the controller 4, and can synchronize the noise and the reference signal for generating the antiphase sound. Therefore, the algorithm calculation device incorporated in the controller 4 can restart the calculation of the algorithm using the filter coefficient of the adaptive filter that generates the antiphase sound before the engine 22 is stopped, which is read from the storage device. Therefore, the vehicle vibration control device configured as described above can reduce the periodic noise in a short time, as compared with the case where the calculation of the algorithm for performing the noise control is restarted from the beginning.

[0043]

As described above, the vehicle vibration control apparatus of the present invention is a vehicle vibration control apparatus for reducing the periodic first vibration generated by the first vibration source. A second vibration source that generates a second vibration that reduces the vibration energy of, a storage unit that stores the second vibration, a phase detection unit that detects the phase of the first vibration, and after stopping the first vibration source, When the engine is restarted, the synchronization means synchronizes the second vibration stored in the storage means with the output of the phase detection means.

Therefore, when the phase of the first vibration is detected by the phase detection means, when the first vibration source is restarted after being stopped, the second vibration stored in the storage means is synchronized with the first vibration by the synchronization means. Can be synchronized with. Therefore, it is not necessary to repeat the calculation for performing the vibration control from the beginning, and the second vibration stored in the storage unit can be used, so that a good control result can be obtained in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a connection between a vehicle vibration control device and an engine according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a timing at which the vehicle vibration control device starts noise control.

FIG. 3 is a waveform diagram showing how noise is reduced by the vehicle vibration control device.

FIG. 4 is a waveform diagram showing how noise is reduced by the vehicle vibration control device.

FIG. 5 is a waveform diagram showing how noise is reduced by the vehicle vibration control device.

FIG. 6 is a plan view showing a state in which the vehicle vibration control device is mounted on an automobile.

FIG. 7 is a side view showing a state in which a vehicle vibration control device according to another embodiment of the present invention is mounted on an automobile.

FIG. 8 is a side view showing a state in which a vehicle vibration control device according to another embodiment of the present invention is mounted on an automobile.

FIG. 9 is a block diagram showing a connection between a conventional vehicle vibration control device and an engine.

FIG. 10 is a waveform diagram showing a case where noise control is performed by a conventional vehicle vibration control device.

FIG. 11 is a waveform diagram showing a case where noise control is performed by a conventional vehicle vibration control device.

[Explanation of symbols]

 1 Cycle Detection Sensor 2 Speaker 3 Microphone 4 Controller 5 Operation Switch 6 Phase Detection Sensor 7 Distributor 10 Vehicle Vibration Control Device 22 Engine 24 Ignition Coil 25 Cabin 28 Engine Mount 29 Accelerometer

Claims (1)

[Claims] 1. A vehicle vibration control device for reducing periodic first vibration generated by a first vibration source, the second vibration generating second vibration for reducing vibration energy of the first vibration. Source, storage means for storing the second vibration, phase detection means for detecting the phase of the first vibration, and storage in the storage means by the output of the phase detection means at the time of restarting after stopping the first vibration source. A vibration control device for a vehicle, comprising: a synchronization unit that synchronizes the second vibration.