JP5986128B2 - In-vehicle vibration suppression device - Google Patents

Description

  The present invention relates to an on-vehicle vibration suppression device that suppresses vibration at an arbitrary position in a vehicle.

  As a vibration suppression device that suppresses vibrations caused by an engine in a vehicle, for example, a technique according to Japanese Patent Application Laid-Open No. 2005-299832 has been proposed.

  In this vibration suppression device, a rotation pulse sensor is provided on the crankshaft of the engine to detect low frequency vibrations when the vehicle is idling and high frequency vibrations when the vehicle is running. These vibrations are divided into an idle control signal and a travel control signal, and the electromagnetic actuator is driven to vibrate. This suppresses noise in a wide range of driving conditions of the vehicle.

JP 2005-299832 A

  However, in the configuration according to Japanese Patent Application Laid-Open No. 2005-299832, since the rotation pulse sensor is provided on the crankshaft of the engine, the installation conditions are limited, and a situation in which a design change of the vehicle is required occurs.

  In addition, since there are multiple structural materials between the engine that is the source of vibration and the electromagnetic actuator, even if vibration is generated by the electromagnetic actuator, the vibration caused by the engine may not be effectively canceled by the vehicle structure. is there. For this reason, for example, even if a vibration suppression device is provided for the purpose of suppressing vibration felt at the driver's seat, sufficient vibration suppression cannot be performed, and in the worst case, there is a disadvantage that vibration increases.

  Therefore, a main object of the present invention is to provide an in-vehicle vibration suppression device that is set as a vibration suppression place and can effectively and efficiently suppress vibration at the installation place.

  In order to solve the above-described problem, an on-vehicle vibration suppression device that is mounted on a vehicle and suppresses vibration, is attached to an arbitrary position of the vehicle, detects vibration at the position, and outputs at least one as a vibration signal And at least one or more vibrators which are attached at substantially the same position as the vibration detector and which vibrate vibration based on the vibration signal.

  According to the present invention, since the vibration detection position and the vibration position are provided at substantially the same position, vibration can be efficiently and highly accurately suppressed.

It is a block diagram of the vehicle-mounted vibration suppression apparatus which concerns on 1st Embodiment. It is the figure which illustrated vibration suppression waveform data. It is the figure which illustrated the drive signal. It is a flowchart which shows a vibration suppression process. It is a block diagram of the vehicle-mounted vibration suppression apparatus which concerns on 2nd Embodiment.

<First Embodiment>
An embodiment of the present invention will be described. FIG. 1 is a block diagram of an in-vehicle vibration suppression device 2A according to the present embodiment. The on-vehicle vibration suppression device 2 </ b> A includes a vibration detector 11, a vibration analysis unit 12, a drive signal generation unit 13, a drive unit 14, a vibrator 15, and a storage unit (DB) 16.

  The vibration detector 11 is composed of an acceleration sensor or the like, is attached to an arbitrary vehicle position (vibration suppression position), detects vibration at the attachment position, and outputs it as a vibration signal. Vibration caused by the engine propagates throughout the vehicle via a structure (chassis, vehicle body, etc.). Therefore, the vibration detector 11 detects vibration including the influence (propagation state) by the structure.

  The storage unit 16 stores a plurality of vibration suppression waveform data in advance. FIG. 2 is a diagram showing an example of such vibration suppression waveform data. The vibration signal when the vibration detector 11 receives positive pressure is described on the plus side, and the vibration signal when negative pressure is received is negative. On the side.

  In FIG. 2, the solid line is the vibration suppression waveform data K1, and the dotted line is the vibration signal K2 used when the vibration suppression waveform data K1 was created. The vibration suppression waveform data K1 is approximately the characteristic waveform of the vibration signal K2. Hereinafter, the signal waveform that kicks the vibration signal K2 in this manner is referred to as a feature waveform as appropriate. Since the engine performs periodic motion, the vibration signal also has periodicity. Therefore, the period of the vibration signal is set as the basic time, and the time width of the vibration suppression waveform data K1 is adjusted to the basic time. At this time, with the maximum amplitude value in the vibration signal K2 as the feature strength, the vibration suppression waveform data K1 is normalized by the feature strength and stored in the storage unit 16.

  The vibration analysis unit 12 samples a basic time signal from the vibration signal and uses it as an analysis target signal. Then, the vibration analysis unit 12 selects from the storage unit 16 vibration suppression waveform data K1 having a waveform shape that is most approximate to the feature waveform of the analysis target signal, and detects the feature strength of the analysis target signal. The characteristic strength of the analysis target signal is acquired by comparison with a preset threshold value, and is output together with the selected vibration suppression waveform data K1. FIG. 2 shows a case where threshold values V1 to V6 are provided. The maximum value (absolute value) of the vibration signal is Pa on the plus side and Pb on the minus side. Therefore, the vibration analysis unit 12 determines the larger value of the amplitude value Pa and the amplitude value Pb from the threshold value as the feature strength. For example, the amplitude value Pa is located between the threshold value V5 and the threshold value V6, and the amplitude value Pb is located between the threshold value -V4 and the threshold value -V5. Therefore, the vibration analysis unit 12 sets the amplitude value Pa as the feature strength.

  The drive signal generator 13 outputs a drive signal by adjusting the amplitude of the vibration suppression waveform data K from the vibration analyzer 12 according to the feature strength. At this time, the drive signal is amplitude-adjusted as described above and converted into a pulse signal as shown in FIG. FIG. 3 is a diagram illustrating drive signals.

  The drive unit 14 drives the vibrator 15 based on the drive signal.

  The vibrator 15 is attached to a vehicle vibration suppression position (including the same position as the vibration detector 11 and its vicinity) and vibrates the vibration suppression position.

  In addition, in FIG. 1, although the case where the vibration detector 11 and the vibration exciter 15 are each one is shown, it does not limit to this number. It is also possible to provide a plurality of vibrators 15 for one vibration detector 11.

  For example, the vibration generated by the engine is often three-dimensional vibration. Then, this vibration propagates through the structure to reach the vibration suppression position, and vibrates the vibration suppression position three-dimensionally.

  In order to suppress such vibration, the vibration to be excited needs to have a three-dimensional component. On the other hand, the vibration signal from the vibration detector 11 is a one-dimensional intensity signal having the vibration detection direction of the vibration detector 11 as a dimensional direction. That is, even if the vibration at the vibration suppression position is a three-dimensional vibration, the vibration signal is a one-dimensional signal.

  Various configurations are possible for the vibrator 15, but for example, a type of vibration means such as an electromagnetic actuator can only vibrate one-dimensional vibration.

  Therefore, in order to suppress the three-dimensional vibration, it is necessary to acquire the vibration three-dimensionally and to vibrate three-dimensionally. From such a viewpoint, it is preferable to provide three or more vibration detectors 11 and vibrators 15.

  In addition, since the vehicle is composed of various structures, when the vibration detector 11 and the vibrator 15 are provided at a location separated from each other, the vibrated vibration appropriately causes vibration at the vibration suppression position. There are cases where it cannot be suppressed. However, by providing the vibration detector 11 and the vibrator 15 at the vibration suppression position, it becomes possible to effectively cancel the vibration at the vibration suppression position regardless of the vehicle structure.

  Next, the operation in the on-vehicle vibration suppression device 2A having such a configuration will be described. FIG. 4 is a flowchart showing vibration suppression processing.

  Steps S <b> 1 to S <b> 3: When the vibration suppression process starts, the vibration analysis unit 12 receives a vibration signal from the vibration detector 11. When the vibration detector 11 is configured by an analog detector such as an acceleration sensor, vibration can be detected in real time, and therefore, a vibration signal is input to the vibration analysis unit 12 simultaneously with the start of the vibration suppression process. Therefore, the vibration analysis unit 12 samples the vibration signal at the reference time and acquires a signal to be analyzed (analysis target signal).

  Then, the vibration analysis unit 12 compares the analysis target signal with the threshold value to acquire the feature strength.

  Step S4: Thereafter, the vibration analysis unit 12 acquires a characteristic waveform of the analysis target signal, and selects vibration suppression waveform data having a high degree of coincidence with the characteristic waveform from the storage unit 16.

  Step S5: The acquired vibration suppression waveform data is converted into a pulse signal as shown in FIG. 3 by the drive signal generation unit 13, and the peak value of this pulse signal is amplified (adjusted) by the feature intensity to obtain the drive signal. Is output to the drive unit 14. At this time, the vibration analysis unit 12 can perform fast Fourier transform on the analysis target signal, analyze the main frequency, and set the period of the pulse signal based on the vibration frequency based on the analysis result.

  Steps S6 and S7: The drive unit 14 amplifies the drive signal and drives the vibration exciter 15, so that the vibration exciter 15 vibrates vibration at the vibration suppression position.

  At this time, if the detection signal becomes sufficiently small, the process ends. If the detection signal is insufficient, the process returns to step S6, and the amplification factor (characteristic strength) of the drive signal when driving the vibrator 15 is obtained. Change and repeat the vibration. Insufficient cases include cases where the vibrations are increased by excitation.

  In the case where a plurality of vibrators 15 are provided, multi-dimensional vibration suppression is performed by determining for each vibrator (or each vibration detector) whether or not vibration is suppressed. Can do.

  Further, in the above description, the case where the drive signal generation unit 13 generates a pulse signal corresponding to the vibration suppression waveform data has been described. However, the vibration suppression waveform data is converted into the form of the pulse signal (the envelope of the pulse signal is the vibration suppression waveform (Corresponding to the waveform of the data).

  As described above, since vibration is detected and applied to the detected position, vibration can be efficiently suppressed without requiring engine drive information and without considering structural factors.

Second Embodiment
Next, a second embodiment of the present invention will be described. In addition, about the same structure as 1st Embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  The characteristic strength and characteristic waveform also depend on the engine speed. In particular, in a vehicle composed of many structures, each structure has a unique resonance frequency, and thus may have a characteristic waveform with a unique shape. In order to effectively suppress such vibration, it is preferable to acquire information related to the engine speed and use it for selecting vibration suppression waveform data.

  Therefore, in the present embodiment, the vehicle speed corresponding to the engine speed is detected and used for selecting the vibration suppression waveform data so that the vibration suppression waveform data having a high degree of coincidence can be effectively selected.

  FIG. 5 is a block diagram of such an in-vehicle vibration suppression device 2B. The on-vehicle vibration suppression device 2 </ b> B includes a speed detector 17 that detects a vehicle speed, and a signal (speed signal) from the vehicle speed detector 17 is input to the vibration analysis unit 12. The speed signal may be a signal output from an ECU (electronic control unit).

  The vibration suppression waveform data stored in the storage unit 16 is grouped according to the speed.

  Therefore, the vibration analysis unit 12 generates a characteristic waveform based on the vibration signal from the vibration detector 11 and acquires a speed (detection speed) from the speed signal.

  Then, when selecting the vibration suppression waveform data from the storage unit 16, the vibration analysis unit 12 selects one vibration suppression waveform data from the vibration suppression waveform data of the corresponding detection speed.

  Thereby, for example, even when the structure is resonating, it becomes possible to select vibration suppression waveform data according to the feature, and to suppress vibration with high accuracy and efficiency. It becomes possible.

2A, 2B On-vehicle vibration suppression device 11 Vibration detector 12 Vibration analysis unit 13 Drive signal generation unit 14 Drive unit 15 Exciter 16 Storage unit 17 Vehicle speed detector

Claims (4)

An on-vehicle vibration suppression device that is mounted on a vehicle and suppresses vibration,
At least one vibration detector that is attached to an arbitrary position of the vehicle, detects vibration at the position, and outputs it as a vibration signal;
At least one or more vibrators that are attached at substantially the same position as the vibration detector and vibrate vibration based on the vibration signal;
In addition,
A storage unit that stores a plurality of characteristic vibration waveforms as vibration suppression waveform data in advance;
The signal strength of the vibration signal is acquired as a feature strength, the signal waveform of the vibration signal is extracted as a feature waveform, and vibration suppression waveform data having a high degree of coincidence with the feature waveform is selected and output from the storage unit A vibration analysis unit;
A drive signal generation unit that converts vibration suppression waveform data from the vibration analysis unit into a drive signal, and adjusts an amplitude value of the drive signal based on the characteristic strength;
A drive unit for driving the vibrator based on the drive signal ;
An on-vehicle vibration suppression device comprising: The on-vehicle vibration suppression device according to claim 1 ,
A vehicle speed detector for detecting the vehicle speed of the vehicle as a vehicle speed signal;
The in-vehicle vibration, wherein the vibration analysis unit selects and outputs the vibration suppression waveform data having a high degree of coincidence with the characteristic waveform from the vibration suppression waveform data according to the vehicle speed signal. Suppression device. The on-vehicle vibration suppression device according to claim 1 or 2 ,
The on-vehicle vibration suppressing device, wherein the driving signal is a pulse signal. The on-vehicle vibration suppression device according to claim 3 ,
The vibration analysis unit is an on-vehicle vibration suppression device that uses a frequency obtained by performing frequency analysis on the vibration signal as a frequency of the pulse signal.

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