JPH05321976A - Vibration controller - Google Patents

Abstract

PURPOSE:To minimize the transmission of the vibration of an engine to a vehicle body. CONSTITUTION:The explosion of an engine is detected by a pulse sensor 16. A control circuit 22 forms plural sine waveforms whose periods are of an integer multiple of the explosion period of the engine and are different from each other, and plural cosine waveforms whose periods are the same as sine waveforms and which have phase difference of 90 degrees from the sine waveforms, and compensates the amplitudes of the sine waveform and the cosine waveform so that the vibration of a vehicle body may be damped. Excitation force is determined based on a synthetic waveform formed by synthesizing plural compensated sine waveforms and cosine waveforms respectively, and is transmitted to the vehicle body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control device, and more particularly to a vibration control device for damping the vibration of a vehicle body equipped with an engine.

[0002]

2. Description of the Related Art An engine is mounted on a vehicle body through an engine mount.
At this time, the exciting force Fe generated by the engine is expressed by the following formula 1 excluding the DC component.

[0003]

[Equation 1]

However, n = 1, 2, 3, ...
a _n is amplitude, ω is frequency, t is time, and δ _n is initial phase. Further, the force transmitted from the engine to the vehicle body via the engine mount is represented by the following mathematical expression 2.

[0005]

[Equation 2]

This engine mount is a component that is difficult to design because it supports the weight of the engine and has a vibration damping function. For this reason, it is the current situation that the engine mount alone does not provide a sufficient anti-vibration function.

The present invention has been made to solve the above problems, and it is a vibration control that can minimize the vibration of a vehicle body equipped with an engine by damping the vibration transmitted from the engine to the vehicle body. The purpose is to provide a device.

[0008]

In order to achieve the above object, the present invention provides a detection means for detecting an engine explosion, and a plurality of first periods each having a cycle that is an integral multiple of the engine explosion cycle and has a different cycle. And a plurality of second waveforms having a cycle similar to the first waveform and having a phase difference with respect to the first waveform, and a member for transmitting engine vibration. A correction unit that corrects the amplitude of the first waveform and the amplitude of the second waveform so that the vibration is attenuated, and a plurality of the first waveform and the second waveform that are corrected by the correction unit are combined. Calculating means for calculating the synthesized waveform,
And a transmission means for transmitting the exciting force generated based on the composite waveform to the member.

[0009]

In general, a PE characteristic (P
However, in the case of engine vibration, only input components related to the cycle of engine explosion are generated.
Focusing on this point, the present invention utilizes only the input component related to the cycle of engine explosion to damp the vibration.

The detection means of the present invention detects engine explosion. The generating means generates a plurality of first waveforms and a plurality of second waveforms. The first waveform has a cycle that is an integral multiple of the explosion cycle of the engine and has a different cycle, and the second waveform has a cycle similar to that of the first waveform and a phase difference with respect to the first waveform. Is a waveform with. The correction means is configured to reduce the vibration of the member to which the engine vibration is transmitted by the first correction means.
The amplitude of the waveform and the amplitude of the second waveform are corrected. The calculating means calculates a combined wave obtained by combining a plurality of the first waveform and the second waveform corrected by the correcting means. Then, the transmission means transmits the exciting force generated based on the composite waveform to the member to which the engine vibration is transmitted. As described above, the present invention utilizes the waveform related to the cycle of engine explosion, that is, the regularity of the explosive force of the engine. Therefore, the transfer characteristic of the system, that is, the simple structure for correcting the amplitude by the correction means. Can be done at. Further, since only the waveform related to the engine explosive force is used, control can be performed excluding the exciting force and noise other than the explosive force, and the control stability is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied as a vibration control device for controlling the vibration of a vehicle body equipped with an engine through an engine mount will be described below.

As shown in FIG. 1, an engine 14 is mounted on a vehicle body 10 via an engine mount 12.
A pulse sensor 16 for detecting an engine explosion pulse is attached to the engine 14. A pickup or the like can be used as the pulse sensor 16,
A microcomputer for calculating the ignition timing of the engine may be used as the pulse sensor and the ignition timing may be used as the explosion pulse. Further, as will be described below, the frequency of the explosion pulse is obtained from the output of the pulse sensor 16, but the frequency of the explosion pulse may be obtained from the explosion pulse of the engine 1 cylinder, and in the case of a multi-cylinder engine or the like. The frequency of the explosion pulse may be set to 1 / cylinder of the frequency of the explosion pulse of the entire engine. This pulse sensor 16
Are connected to the control circuit 22.

A vibration sensor 18 for detecting the vibration of the vehicle body 10 and an actuator 20 for transmitting the vibration to the vehicle body 10 are attached to the vehicle body 10. Vibration sensor 18
The actuator 20 is connected to the control circuit 22. The actuator 20 may be built in the engine mount.

Next, the details of the control circuit 22 will be described. The control circuit will be described below by describing a general formula and a control circuit using this general formula for the sake of simplicity.

The control circuit 22 includes an oscillator 30 connected to the pulse sensor 16. This oscillator 30 is
The waveform of in (nωt) is output. Where n is an integer, ω
Is the frequency of the engine explosion pulse calculated from the output of the pulse sensor 16, and t is time. The oscillator 30 is connected to the multiplier 36 and the multiplier 38 via the overvoltage protection circuit 32 and the buffer amplifier 34. The multiplier 38 is
It is connected to the multiplier 36 via a multiplier 40 and an integrator 42 that multiply a predetermined coefficient −γ _n .

Further, the control circuit 22 includes an oscillator 50 connected to the pulse sensor 16, and the oscillator 50 outputs a waveform of cos (nωt). The oscillator 50 is connected to the multiplier 56 and the multiplier 58 via the overvoltage protection circuit 52 and the buffer amplifier 54. The multiplier 58 is connected to the multiplier 56 via a multiplier 60 and an integrator 62 that multiply a predetermined coefficient −ξ _n .

Further, the control circuit 22 includes an overvoltage protection circuit 72 connected to the vibration sensor 18, and the overvoltage protection circuit 72 is provided with a multiplier 38 via a buffer amplifier 74.
And a multiplier 58. The multiplier 36 and the multiplier 56 are connected to the adder 80, and the adder 8
0 is connected to the actuator 20 via the output control circuit 82.

Next, the operation of this embodiment will be described. The engine explosion pulse detected by the pulse sensor 16 is generated by the oscillator 3
0 and the oscillator 50. The oscillator 30 has a waveform sin having a frequency that is an integral multiple of the frequency of the engine explosion pulse.
(Nωt) is output. Further, the oscillator 50 is a sin (nω
waveform cos (nωt) whose phase is shifted by 90 degrees with respect to t)
Is output. The waveform sin (n
ωt) is input to the multiplier 36 and the multiplier 38 via the overvoltage protection circuit 32 and the buffer amplifier 34. The amplitude Y (t) of the vibration of the vehicle body 10 detected by the vibration sensor 18 is input to the multiplier 38 via the overvoltage protection circuit 72 and the buffer amplifier 74.

The multiplier 38 multiplies the waveform sin (nωt) and the amplitude Y (t), the multiplier 40 multiplies the output of the multiplier 38 by the coefficient −γ _n , and the integrator 42 outputs the output of the multiplier 40. It is integrated and output as the amplitude An (t). This An (t)
Is like Equation 3.

[0020]

[Equation 3]

The waveform cos (n output from the oscillator 50
ωt) is input to the multiplier 56 and the multiplier 58 via the overvoltage protection circuit 52 and the buffer amplifier 54. The amplitude Y (t) of the vibration of the vehicle body 10 detected by the vibration sensor 18 is input to the multiplier 58 via the overvoltage protection circuit 72 and the buffer amplifier 74.

The multiplier 58 multiplies the waveform cos (nωt) by the amplitude Y (t), the multiplier 60 multiplies the output of the multiplier 58 by the coefficient −ξ _n , and the integrator 62 outputs the output of the multiplier 60. It is integrated and output as the amplitude Bn (t). This Bn (t)
Is like Equation 4.

[0023]

[Equation 4]

As can be understood from the equations 3 and 4, the amplitudes An (t) and Bn (t) are the amplitude Y (t) of the vibration of the vehicle body.
Is included. In addition, the target value of the body vibration amplitude is set to 0.
(To minimize the vibration of the vehicle body), the error e is e
= 0−Y (t), and the amplitude An of the vibration of the vehicle body detected by the vibration sensor 18 becomes zero so that the amplitude Y (t) becomes 0.
The vibration of the vehicle body can be minimized by determining (t) and Bn (t).

The multiplier 36 multiplies the output of the buffer amplifier 34 by the output of the integrator 42, and the multiplier 56 outputs the buffer 54.
The output is multiplied by the output of the integrator 62. And the adder 8
0 outputs the waveform shown by the equation 5 in which the output of the multiplier 36 and the output of the multiplier 56 are added.

[0026]

[Equation 5]

The output control circuit 82 synthesizes the waveform by adding a predetermined number of outputs from the adder 80,
The actuator 20 is controlled based on this composite waveform. Thus, the vibration of the vehicle body can be damped by using only the waveform related to the cycle of engine explosion, that is, the waveform related to the engine explosive force. Further, since only the waveform related to the engine explosive force is used, control can be performed excluding the exciting force and noise other than the explosive force, and the control stability is improved.

In the above, the general formula and the control circuit using the general formula have been described for the sake of simplicity.
Actually, a predetermined number m from n = 1 (for example, 4, 6)
Etc.) form a predetermined m number of waveforms shown in Formula 6 using the number of oscillators, multipliers, adders, etc., and output control circuit 82
The waveforms are synthesized in accordance with the equation shown in Equation 7.

[0029]

[Equation 6]

[0030]

[Equation 7]

In the above, the waveform having a frequency that is an integral multiple of the explosion frequency of the engine is a sine wave, but a rectangular wave or a triangular wave may be used. In addition, the most effective phase difference is 9
Although the phase difference is set to 0 degree, if the phase difference is near 90 degrees, an effect having no practical problem can be obtained. Furthermore, in the above, the frequency of the explosion is detected from the engine's explosion pulse, and a waveform whose cycle is an integral multiple of the explosion cycle is generated, but the cycle of the explosion is detected from the engine's explosion pulse, and the cycle is A waveform or the like that is an integral multiple may be generated. Also, in the above, the transmitter,
Although the example using the control circuit using the multiplier, the adder and the like has been described, the microcomputer may be used to control the actuator.

[0032]

As described above, according to the present invention, the vibration of the member to which the engine vibration is transmitted is damped by synthesizing the waveform whose cycle is an integral multiple of the engine explosion cycle. It is possible to determine the transfer characteristic of the system, and it is possible to perform control with good stability because control can be performed excluding the vibration force other than the engine explosive force and noise.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a control circuit of FIG.

[Explanation of Codes] 10 Vehicle Body 12 Engine Mount 14 Engine 16 Pulse Sensor 18 Vibration Sensor 20 Actuator 22 Control Circuit 30 Oscillator 32 Overvoltage Protection Circuit 34 Buffer Amplifier 36 Multiplier 38 Multiplier 40 Multiplier 42 Integrator 50 Oscillator 52 Overvoltage Protection Circuit 54 buffer amplifier 56 multiplier 58 multiplier 60 multiplier 62 integrator 72 overvoltage protection circuit 74 buffer amplifier 82 output control circuit

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[Procedure amendment]

[Submission date] June 9, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020]

[Equation 3]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

[0023]

[Equation 4]

Claims (1)

[Claims] 1. A detection means for detecting an engine explosion, a plurality of first waveforms each having a cycle that is an integral multiple of the engine explosion cycle and each having a different cycle, and a cycle that is similar to the first waveform. A plurality of second waveforms having a phase difference with respect to the first waveform
And a correction unit that corrects the amplitude of the first waveform and the amplitude of the second waveform so that the vibration of the member to which the engine vibration is transmitted is attenuated. A calculating means for calculating a combined waveform in which a plurality of corrected first waveforms and a plurality of second waveforms are combined, and a transmitting means for transmitting an exciting force generated based on the combined waveform to the member. Vibration control device including.