JPH0642579A - Vehicle vibration reducing device - Google Patents

Abstract

PURPOSE:To reduce the power consumption of a controlled vibration generating means without greatly losing the vibration reducing effect in a vibration reducing device of a vehicle using the optimization method. CONSTITUTION:A controlled condition detecting means 38 to detect the controlled condition by the optimization method and an adjusting means 42 to reduce/change only the amplitude of the driving signal (y) when the controlled condition detecting means 38 detects the steady condition of the control are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a vibration generating means to generate a new control vibration for a control target vibration which is generated in a predetermined portion of a vehicle due to an engine vibration. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle vibration reduction device configured to positively reduce vibrations by stacking them.

[0002]

2. Description of the Related Art Vibration of an engine in a vehicle propagates to the vehicle body through a mounting portion of the engine to the vehicle body to generate an unpleasant vibration in the vehicle interior, or propagates through air to cause annoying to passengers. It causes noise.

Conventionally, for example, as disclosed in Japanese Patent Publication No. 1-501344, a vibration having an anti-phase relation to the vibration to be reduced is generated by an optimization method, and the vibration is reduced. There is known a vibration reduction device that reduces vibration by overlapping with desired vibration. This type of vibration reduction device generally has the following configuration. FIG. 7 is a diagram showing a schematic configuration of a conventional vehicle vibration reduction device.

As shown in FIG. 7, the above-described conventional vehicle vibration reducing device is arranged at a predetermined position of the vehicle and detects m vibration detecting means (when detecting noise, (Generally uses a microphone.) 2 and i control vibration generating means (generally, when generating sound, arranged at a predetermined position of the vehicle to generate control vibration for reducing the vibration at the vibration detection position). A speaker is used.) 4 and a drive signal generating means 6 for generating drive signals y _{1 to} y _i for driving the control vibration generating means 4.

The vibration detecting means 2 detects both the control vibration generated from the control vibration generating means 4 and the control target vibration generated due to the vibration of the engine E, and the detected vibration is detected as an error. and outputs it as the signal e ₁ to e _m.
The drive signals y _{1 to} y _i are obtained by passing the reference signal x output from the reference signal generating means 8 through the adaptive filters F _{1 to} F _i .

[0006] The drive signal generation unit 6, the adaptive algorithm unit 10, as described above error signal inputted from the vibration detecting means 2 e ₁ to e _m is the minimum of the Tejitaru filter F ₁ to F _i It is configured to adjust the parameters moment by moment. An LMS method (Least Mean Square Method) is used as an adaptive algorithm for this adjustment.
), Simplex method, Powell method, etc. are known.
It is by law. By the above adjustment, the drive signal generation means 6 causes the drive signal y ₁ to be based on the reference signal x.
Generate ~ y _i . In the LMS method, the reference signal x is the digital filter H ° _IM (I = 1, 2,
, I; M = 1, 2, ..., M) is input to the adaptive algorithm unit 10, and the H ° _IM is the I-th control vibration generating means 4 and the M-th vibration detecting means 2. The transmission characteristic between the two is modeled, so that the spatial distance between the controlled vibration generating means 4 and the vibration detecting means 2 is interpolated, so to speak.

[0007] In the driving signal generating means 6, the signal processing is performed by the digital computation, amplifier 12 and A / D converter 14 to the input stage of the reference signal x is also the input of the error signal e ₁ to e _m Amplifier 16 and A in the stage
A / D converter 18 is further provided, and a D / A converter 20 and an amplifier 22 are respectively provided at the output stages of the drive signals y _{1 to} y _i .

[0008]

By the way, a large amount of electric power is required to drive the control vibration generating means.
In particular, when the control vibration generating means is a means for directly vibrating the vehicle body like an exciting actuator, the power consumption becomes large. Therefore, there is a demand to reduce the power consumption of the control vibration generating means as much as possible without impairing the vibration reducing effect.

In the state where the optimum vibration reduction is performed, that is, the control target vibration is completely canceled by the control vibration, the control target vibration and the control vibration have opposite phases and the amplitudes of both are equal. is there. When the phase difference between the controlled vibration and the controlled vibration changes from a state where the two are in the opposite phase relationship, the two strengthen each other and the controlled vibration suddenly increases. On the other hand, if the control target vibration and the control vibration are in the opposite phase, even if the amplitude of the control vibration becomes smaller than the amplitude of the control target vibration, a small amount of vibration that remains without being canceled can occur. However, the controlled object vibration does not increase sharply.

Therefore, in order to reduce the power consumption of the control vibration generating means without significantly impairing the vibration reduction effect, only the amplitude of the control vibration is maintained while maintaining the state in which the control target vibration and the control vibration are in opposite phases. It is only necessary to reduce the drive amount of the control vibration generating means so that it becomes smaller. However, in the vehicle vibration reduction device using the above-described optimization method, since the phase adjustment and the amplitude adjustment of the control vibration are inseparably performed by the adaptive algorithm, the control target vibration and the control vibration as described above are It was difficult to reduce only the amplitude of control vibration while maintaining the state in which the phase was in the opposite phase.

The problem to be solved by the present invention is to reduce the power consumption of the control vibration generating means in the vehicle vibration reducing apparatus using the optimization method without significantly impairing the vibration reducing effect. To do.

[0012]

As a means for solving the above-mentioned problems, in a vehicle vibration reducing apparatus according to a first aspect of the present invention, in the vehicle vibration reducing apparatus having the above-mentioned structure, control by an optimization method is performed. The control state detecting means for detecting the state and the adjusting means for reducing and changing only the amplitude of the drive signal when the control state detecting means detects the steady state of the control are provided.

As a means for solving the above problems, in a vehicle vibration reducing apparatus according to a second aspect of the present invention, the vehicle vibration reducing apparatus having the above-mentioned configuration detects a control state by an optimization method. Control state detection means,
Vibration state detection means for detecting the vibration state of the controlled object vibration, and when the control state detection means detects a steady state of control, the amplitude of the drive signal is reduced and changed, and after the steady state of control is detected, the The vibration state detecting means includes an adjusting means for stopping the change in the amplitude reduction when the non-steady state of the control target vibration is detected.

Further, as a concrete means for solving the above-mentioned problems, in a vehicle vibration reducing apparatus according to a third aspect of the present invention, the control state detecting means according to the first or second aspect is provided with the control target vibration. The vibration state of No. 1 is detected, and the steady state of the control is detected based on the fact that the vibration to be controlled has become the steady state.

Further, as a preferable means for solving the above-mentioned problems, in a vehicle vibration reducing apparatus according to a fourth aspect of the present invention, the amplitude of the drive signal by the adjusting means according to the first, second or third aspect is adjusted. The decrease change is a gradual decrease change in which the amplitude is gradually decreased.

The steady state of control by the above optimization method is specifically a state in which the adjustment of the parameters of the adaptive filter is in a steady state, that is, a state in which the parameters of the adaptive filter are settled to a substantially constant state. Say.

[0017]

In the vehicle vibration reducing apparatus according to the present invention, the adjusting means reduces and changes only the amplitude of the drive signal when the control state detecting means detects the steady state of the control by the optimization method.

The fact that the control by the optimization method is in the steady state means that the parameter of the adaptive filter is fixed to a constant state, and the vibration of the controlled object is reduced to the maximum. It is in a state. Therefore, even when the control by the optimization method is suspended and the parameters of the adaptive filter are fixed to a constant state when the above-mentioned control is in a steady state, the vibration is sufficiently reduced. In this way, when the control by the optimization method is in a non-steady state, that is, when the parameters of the adaptive filter are adjusted every moment, it is difficult to reduce only the amplitude of the drive signal, but the control by the optimization method is difficult. Is in a steady state, the control by the optimization method is interrupted as described above, and the amplitude of the drive signal is reduced after the adjustment of the parameters of the adaptive filter is not performed. It becomes possible.

If only the amplitude of the drive signal is reduced and changed, the drive amount of the control vibration generating means can be reduced, and further, only the amplitude of the control vibration is reduced while maintaining the state where the controlled vibration and the controlled vibration are in opposite phases. Therefore, it is possible to reduce the power consumption of the control vibration generating means without significantly impairing the vibration reduction effect.

It should be noted that the change in the amplitude of the drive signal is stopped when it returns to the state before the steady state of control, that is, the state in which the sufficient vibration reduction effect cannot be obtained unless the parameters of the adaptive filter are adjusted momentarily. However, in the vibration reducing device for a vehicle according to the present invention including the vibration state detecting means for detecting the vibration state of the control target vibration, the vibration state detecting means is provided after the steady state of control is detected. When the non-steady state of the controlled object vibration is detected, the change of the amplitude reduction is stopped.

As described above, according to the vehicle vibration reducing apparatus of the present invention, since the control state detecting means and the adjusting means are provided, the power consumption of the control vibration generating means can be reduced without significantly impairing the vibration reducing effect. It becomes possible to reduce.

According to the change of the amplitude of the drive signal by the adjusting means, the amplitude of the drive signal is gradually decreased so that the occupant does not become aware of the increase in the vibration of the controlled object due to the decrease of the amplitude. In addition, it is possible to reduce power consumption.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle vibration reducing device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing a schematic structure of a vehicle vibration reducing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing its mounting position. In the vehicle vibration reducing apparatus according to this embodiment, the same elements as those of the conventional vehicle vibration reducing apparatus shown in FIG. 7 are designated by the same reference numerals, and detailed description thereof will be omitted.

The vehicle vibration reducing apparatus according to the present embodiment is intended to reduce the vibration of the controlled object generated in the vehicle body due to the driving of the engine E, and is provided at a predetermined position of the vehicle body as shown in the figure. m (1 in FIGS. 1 and 2 for simplicity)
Only shown. ) Accelerometer 32 as vibration detection means
And i parts that are interposed between the engine E and the vehicle body at a mounting portion of the engine E to the vehicle body and generate control vibration for reducing the vibration of the controlled object (for simplification, see FIGS. 1 and 2). , Only one is shown.) Exciting actuator 34 as a control vibration generating means, and controller C for driving each actuator 34 are provided.

As shown in FIG. 1, the controller C is
Reference signal generating means 36 for generating a reference signal x based on the vibration of the engine E, and drive signal generating means 6 for generating a drive signal y for driving each actuator 34 based on the reference signal x are provided. ing. The drive signal generating means 6 allows each of the actuators 34 by passing the reference signal x.
I (only one is shown for the sake of simplicity) of the adaptive filters F for obtaining the drive signal y for driving the control signals generated by the vibrations generated by the actuators 34 and the drive of the engine E. The adaptive algorithm unit 10 adjusts each of the adaptive filters F so that the error signal e output from each of the acceleration sensors 32, which is detected together with the vibration, is minimized. In the present embodiment, the adaptive algorithm as an optimization method used for adjusting each of the adaptive filters F is the LMS method, and therefore the control vibration generating means 6 includes the actuators 34 and the acceleration sensors 32. And a digital filter H ° that models the transfer function between and. The controller C includes an amplitude adjuster 36 for amplifying the reference signal x and an A / D converter for digitally converting the signal x.
14, a D / A converter 20 for analog-converting each drive signal y and an amplifier 22 for amplifying the same signal y, an amplifier 16 for amplifying each error signal e, and an A / D for converting the same signal e digitally. A converter 18 and is built in.

The feature of the present invention is that in the present embodiment, the control state detecting means 38 for detecting the control state by the optimization method is used.
And a vibration state detecting means 40 for detecting the vibration state of the controlled object vibration, and when the control state detecting means 38 detects a steady state of the control, only the amplitude of the drive signal y is reduced and changed, and then the vibration state detecting means 40. Is provided with adjusting means 42 for stopping the above-mentioned change in amplitude reduction when a non-steady state of the controlled vibration is detected. This point will be described in detail below.

FIG. 3 is a flow chart showing the flow of control according to the present embodiment, and FIG. 4 is a diagram showing the adjustment timing by the adjusting means. FIG. 3 (a) shows changes in the engine rotation cycle, and FIG. The ON / OFF timing of the adjusting switch shows the change of the gain of the amplitude adjuster in FIG.

As shown in FIGS. 3 and 4, the control state detecting means 38 detects the vibration state of the controlled object vibration by detecting the engine rotation cycle T, and the engine rotation cycle T remains substantially constant for a predetermined time. Based on this, the steady state of control is detected. Note that K shown in FIG. 3 is a counter initially set to K = τ, and the control state detecting means 38 detects the engine rotation cycle T at each sampling time, and the change of the engine rotation cycle T is a predetermined value between the sampling times. ΔT
When there is no change as described above, K is decremented by 1 at each sampling time, and it is determined that the engine rotation cycle T is in a substantially constant state for a predetermined time because K = 0.

When the control state detecting means 38 detects a steady state of control, the adjusting means 42 turns off the adjustment switch 44 shown in FIG. 1 to interrupt the adjustment of the parameter of the adaptive filter F by the adaptive algorithm section 10. Then, the parameter of the adaptive filter F is fixed to a constant state, and the gain B of the amplitude adjuster 36 is gradually reduced from 1. Since the adjustment switch 44 is OFF, if the gain B of the amplitude adjuster 36 is reduced, only the amplitude of the drive signal y is reduced, which reduces the drive amount of the actuator 34 without impairing the vibration reduction effect. The power consumption can be reduced. That is, if the amplitude of the drive signal y is reduced, the error signal e output from the vibration detecting means 32 is correspondingly increased, and the adaptive algorithm unit 10 tries to reduce the increased error signal e again. Since the adjustment switch 44 is OFF, the parameters of the adaptive filter F are not adjusted. Therefore, by reducing the amplitude of the reference signal x, only the amplitude of the drive signal y can be reduced. On the other hand, when the control is in the steady state, the parameters of the adaptive filter F are substantially constant, and the vibration reduction is maximized. Therefore, the adjustment switch 44 is turned off and the adaptive filter F is turned off.
Even if the parameter is fixed to a constant state, the control vibration can be maintained in the opposite phase to the control target vibration. Therefore, if the amplitude of the reference signal is reduced from this state, the state in which the control vibration and the control target vibration are in opposite phases is not changed, that is, without significantly impairing the vibration reduction effect, only the amplitude of the drive signal, that is, the control vibration Only the amplitude can be reduced.

As shown in FIG. 3, in the present embodiment, the adjusting means 42 has an unsteady state of the controlled vibration by the vibration state detecting means 40 after the control steady state is detected by the control state detecting means 38. Until 0 is detected, the gain B of the amplitude adjuster 36 is set to β ₁ (0 <β ₁ <1) every sampling period.
By multiplying by, the amplitude of drive vibration is gradually reduced. Further, the vibration state detecting means 40 detects the vibration state of the control target vibration by detecting the engine rotation cycle T, and if the change of the engine rotation cycle T between sampling cycles is equal to or more than a predetermined value ΔT, the control target vibration is not detected. Determine that it is in a steady state. Then, the adjusting unit 42 turns on the adjusting switch 44 when the control state detecting unit 38 detects the steady state of control and then the vibration state detecting unit 40 detects the non-steady state of the controlled vibration. The reduction change of the amplitude of the drive signal y is stopped. In this embodiment, when the adjustment switch 44 is turned on, the gain B of the amplitude adjuster 36 is not suddenly returned to 1 but is set to B every sampling cycle.
Is multiplied by β ₂ (β ₂ > 1) so that the gain B is gradually returned to 1. The reason is that a sudden change in the control vibration due to the sudden return of the gain B to 1 is prevented and the vibration is reduced. This is due to consideration for smooth control. Note that FIG.
P is a ON / OFF signal of the adjustment switch 44, and P =
0 indicates an OFF state, and P = 1 indicates an ON state.

Although the embodiment of the vehicle vibration reducing apparatus according to the present invention has been described above, the vehicle vibration reducing apparatus according to the present invention is not limited to such an embodiment, and various modifications can be made. Is.

For example, although the actuator is used as the control vibration generating means in the above-mentioned embodiment, a speaker may be used as the control vibration generating means in order to particularly reduce noise.

In the above embodiment, L is used as the optimization method.
Although the MS method is used, the present invention can also be applied to a vehicle vibration reduction device using the simplex method or the Powell method as an optimization method.

Although not directly related to the present invention, the power consumption of other equipment of the vehicle is assumed to be configured so as to reduce the power consumption of the control vibration generating means in the vehicle vibration reduction apparatus. Since it is conceivable to reduce the drive amount of the control vibration generating means based on the state, such a vibration reducing device for a vehicle will be briefly described below.

FIG. 5 is a diagram showing a schematic configuration of another vehicle vibration reducing apparatus, and FIG. 6 is a flow chart showing the control flow thereof. In the vehicle vibration reduction device shown in FIG. 5, the same elements as those of the vehicle vibration reduction device according to the present invention are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 5, this vehicle vibration reducing apparatus has an alternator 48 that indicates the voltage value V of the battery 46 and whether or not there is a shortage of the engine or the circuit or a failure of the alternator 48.
From the battery 46, the current value I flowing from the battery 46 to the light 50, the air conditioner 52, and the like, and the amplitude A of the drive signal y are detected, and when the current value I becomes larger than the predetermined value I ₀ , the drive signal Adjustment means 42 'for reducing the amplitude A of y to reduce the power consumption of the actuator 34 is provided.

Although a detailed description of the control flow is omitted, as shown in FIG. 6, the adjusting means 42 'causes the normal vibration reduction control to be performed when the current value I is equal to or less than the predetermined value I ₀ . When the current value I becomes larger than the predetermined value I ₀ , the failure signal L becomes L = 0 (that is, the engine stall, the circuit short circuit or the alternator 48 fails), or the battery voltage value V. Is a predetermined value V ₀
If it is larger than the other, and either of them occurs, the gain B of the amplitude adjuster 36 is set to 0 and the vibration reduction control is stopped. Even if the current value I is I> I ₀ , the amplitude A of the drive signal y is L when L ≠ 0 and V ≧ V _0.
The gain B of the amplitude adjuster 36 is reduced every moment so that the average value S within the predetermined sampling time does not exceed the limit value A ₀ of the amplitude.

The symbols shown in FIG. 6 have the following meanings.

A = [A (0), A (1), ..., A (j)] = [| a (n) |, | a (n-1) |, ..., | a (n-j) |] A (n): output signal at time n (current) A ₀ : limit value for A B: gain of amplitude adjuster S, j: variables

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a vehicle vibration reduction device according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a mounting position of the device shown in FIG.

FIG. 3 is a flowchart showing a flow of control by the device shown in FIG.

FIG. 4 is a diagram showing an adjustment timing by an adjusting means of the apparatus shown in FIG.

FIG. 5 is a diagram showing a schematic configuration of a vibration reduction device for another vehicle.

6 is a diagram showing the flow of control by the device shown in FIG.

FIG. 7 is a diagram showing a schematic configuration of a conventional vehicle vibration reduction device.

[Explanation of symbols]

 4 speaker 6 drive signal generating means 8, 36 reference signal generating means 32 acceleration sensor 34 actuator 38 control state detecting means 40 vibration state detecting means 42 adjusting means E engine F adaptive filter x reference signal y drive signal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norihiko Nakao 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. In-company (72) Yutaka Tsukahara, 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) In-house Shingo Harada, 3-1-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Corporation

Claims (4)

[Claims] 1. A control vibration generating means for generating control vibration for reducing a control target vibration generated at a predetermined portion of a vehicle due to engine vibration, and a drive signal for driving the control vibration generating means. And a drive signal generating means for generating a drive signal by means of an optimization method based on a reference signal related to the drive state of the engine, a control state detecting means for detecting a control state by the optimization method. A vibration reducing apparatus for a vehicle, further comprising: an adjusting unit that reduces and changes only the amplitude of the drive signal when the control state detecting unit detects a steady state of control. 2. A control vibration generating means for generating a control vibration for reducing a control object vibration generated in a predetermined portion of a vehicle due to an engine vibration, and a drive signal for driving the control vibration generating means. And a drive signal generating means for generating a drive signal by means of an optimization method based on a reference signal related to the drive state of the engine, a control state detecting means for detecting a control state by the optimization method. A vibration state detecting means for detecting a vibration state of the controlled vibration; and when the control state detecting means detects a steady state of control, the amplitude of the drive signal is changed to be decreased to detect a steady state of control. After that, when the vibration state detecting means detects an unsteady state of the controlled vibration, the adjusting means for stopping the change in the decrease of the amplitude is provided. Vibration reduction apparatus of a vehicle according to claim. 3. The control state detecting means detects the vibration state of the control target vibration and detects the steady state of the control based on the control target vibration becoming the steady state. The vibration reduction device for a vehicle according to claim 1 or 2. 4. The vibration reducing device for a vehicle according to claim 1, wherein the change in the amplitude of the drive signal by the adjusting means is a gradual change in which the amplitude is gradually decreased. .