JPH06278478A - Drive control device for active type vibration control device of internal combustion engine for various vehicles - Google Patents

Abstract

PURPOSE:To not only maintain excellent vehicle performance but also reduce power consumption. CONSTITUTION:In a drive control device for an active mount 6, only when the number of revolutions of an engine is below a given value or engine rotation acceleration exceeds a given value or engine rotation deceleration is below a given value, a normally-opened switch 18 is turned ON by means of an output signal Z for a switching device 21 and a piezoelectric element laminate drive voltage is applied from a signal generating device 16 and an active mount 6 is driven to maintain excellent vehicle performance. Meanwhile, in other case where production of an influence by vibration is reduced, each of the switches 18 is turned OFF by means of an output signal Z for the switching device 21 and drive of the active mount 6 is brought into a stop. Thus, the generation of a consumption power is reduced through drive of the active mount 6, when occasion demands.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active device used in a support device (hereinafter also referred to as engine mounting) for an internal combustion engine that damps vibrations transmitted from the internal combustion engine (hereinafter also referred to as engine) to the passenger compartment in various vehicles. The present invention relates to a vibration damping device.

[0002]

2. Description of the Related Art Conventionally, in engine mounting using such an active vibration isolator (hereinafter also referred to as an active mount), when vibration from the engine is applied to the active mount, the active mount is vibrated following the engine vibration. The vibration transmitted from the engine to the vehicle body is attenuated.
Since the dynamic characteristics of such an active mount can be switched, good vehicle performance can be maintained as performance requirements become more sophisticated. An example of such engine mounting is disclosed in Japanese Utility Model Laid-Open No. 61-1751. The active mount shown as a vibration exciter in the publication is designed to be driven only in a low rotational speed region when the engine is idling. Therefore, since the vibration exciter is not driven outside the area, power consumption can be reduced.

[0003]

However, in order to maintain good vehicle performance, the vibration generated during acceleration / deceleration cannot be ignored.

It is an object of the present invention to improve the drive control area of an active mount to maintain good vehicle performance and reduce power consumption.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an active anti-vibration device for supporting internal combustion engines of various vehicles. The active anti-vibration device switches the dynamic characteristics by transmitting a control output from a driving means. You can do it.

The drive control device of the active vibration isolation device is provided with each discriminating means and control means. The first discriminating means outputs a drive signal when it is determined that the rotational speed of the internal combustion engine is in a low rotational speed region below a predetermined value. The second discriminating means outputs the drive signal when the rotational acceleration of the internal combustion engine is in the acceleration region of a predetermined value or more. The third discriminating means outputs a drive signal when the rotational deceleration of the internal combustion engine is in a deceleration region below a predetermined value. The control means allows the control output transmission from the active vibration isolation device drive means by any one of the drive signals from the determination means.

[0007]

Therefore, the active anti-vibration device is driven not only in the low engine speed region of the internal combustion engine, but also in the predetermined acceleration / deceleration region of the internal combustion engine, but stops in other than these regions.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An engine mounting according to a first embodiment of the present invention will be described below with reference to FIGS.

In the FF vehicle engine horizontal engine mounting shown in FIG. 1, a left passive mount 3 and a right passive mount 4 are installed on both sides of the engine 1 on a roll shaft 2 of the engine 1. A front passive mount 5 and a rear active mount 6 are provided on both sides of the engine 1 along a direction orthogonal to the roll axis 2.
And are installed.

The rear active mount 6 is an active type whose dynamic characteristics can be switched, and the one shown in FIG. 2 is used as an example thereof. The rear active mount 6 will be outlined. The rubber ring 8 is attached to the annular base plate 7, and the movable body 9 is attached to the rubber ring 8. In this movable body 9, a support cylinder 9a is attached on a rubber ring 8, and both inner and outer rings 9b,
9c, a cover 9d and a holding plate 9e are sequentially superposed and attached. The piezoelectric element stack 10 is erected in the support cylinder 9a, and the movable plate 11 is attached to the upper end of the piezoelectric element stack 10 inside the inner ring 9b. A rubber seal 12 closes the outer circumference of the movable plate 11 and the inner circumference of the inner ring 9b. A piston 13 is attached to a central portion of the cover 9d via a rubber tube 14. A liquid chamber 15 is formed between the cover 9d and the movable plate 11. Piston 13
When a load is applied to the rubber ring 8, the load is transmitted to the rubber ring 8 via the movable body 9 and the rubber ring 8 bends by a predetermined amount.

As shown in FIG. 3, a cam position sensor 17 for generating an ignition signal in synchronism with the engine stroke is connected to the signal generator 16 as an active vibration isolator driving means. The signal generator 16 calculates the engine speed and the crank angle based on the engine ignition signal from the cam position sensor 17, and determines the voltage applied to the piezoelectric element laminate 10 by well-known map control based on the calculated values. To do. Then, the signal generator 16 applies a drive voltage as a control output signal to the piezoelectric element laminate 10 via the normally open switch 18 and the amplifier 19 based on the applied voltage. A normally open switch 18 is provided between the signal generator 16 and the amplifier 19 and the power supply 20. These switches 18 are turned on and off by a switching device 21.

An example of this switching device 21 is shown in FIG. The switching device 21 includes a first comparator 22, a second comparator 23, and a third comparator 24, which serve as a determination unit, and the engine tachometer voltage Vo is the first.
Of the second and third comparators 2 via the high-pass filter 25.
It is input to 3,24. In the high-pass filter 25, as shown in FIG. 5, when the engine tachometer voltage Vo rises during acceleration, the filter output voltage Vf becomes + Vfa.
When the engine tachometer voltage Vo decreases during deceleration, the filter output voltage Vf is output as -Vfr. Then, the filter output voltage Vf is input to the second and third comparators 23 and 24.

The first comparator 22 predicts the engine tachometer voltage when the engine speed is a predetermined value N (for example, 2000 rpm), which has a large vibration and adversely affects the vehicle performance, and the predicted reference voltage. Vb is input. Then, the first comparator 22 compares the reference voltage Vb with the actual engine tachometer voltage Vo,
When it is determined that the voltage Vo is in the low rotation speed region P equal to or lower than the voltage Vb, the output signal A is set to the high level (high potential drive signal), and when it is determined that the voltage Vo is not the same, the output signal A is set to the low level (low potential). Drive signal).

In the second comparator 23, the engine tachometer voltage at the time of abrupt acceleration in which the vibration becomes large and adversely affects the vehicle performance is predicted, and the predicted reference voltage + Va at the time of acceleration is input. Then, the second comparator 23 outputs the reference voltage + Va and the filter output voltage +
If it is determined that the voltage + Vfa is in the acceleration region Qa equal to or higher than the voltage + Va by comparing with Vfa, the output signal B is set to the high level, and if it is determined that they are not the same, the output signal B is set to the low level.

In the third comparator 24, the engine tachometer voltage at the time of abrupt deceleration in which vibration becomes large and adversely affects the vehicle performance is predicted, and the predicted deceleration reference voltage Vr is input. Then, the third comparator 24 outputs the reference voltage -Vr and the filter output voltage -V.
If it is determined that the voltage −Vfr is in the deceleration region Qr equal to or lower than the voltage −Vr, the output signal C is set to the high level, and if it is determined that the voltage is not the same, the output signal C is output.
To low level.

The output signals A, B and C of the comparators 22, 23 and 24 are input to the OR circuit 26, respectively. The output signal Z of the OR circuit and the output signals A,
The logical sum Z = A + B + C is established between B and C. Therefore, when at least one of the output signals A, B and C is at high level, the output signal Z of the OR circuit 26 is also at high level. Further, when each of the output signals A, B and C is low level, the output signal Z of the OR circuit 26 is also low level. When the output signal Z is at high level,
Each normally open switch 18 is turned on, and when this output signal Z is at a low level, each normally open switch 18 is turned off.

According to the drive control device for the active mount 6 of the present embodiment, whether the engine speed is equal to or lower than the predetermined value N or the engine rotational acceleration is equal to or higher than the predetermined value α,
Only when the engine rotation deceleration is equal to or less than the predetermined value -α, each normally open switch 18 is turned on by the output signal Z of the switching device 21 and the piezoelectric element laminate drive voltage is applied from the signal generator 16 to the active mount. 6 drives to maintain good vehicle performance. On the other hand, in other cases where the influence of vibration is small, the output signal Z of the switching device 21
Switch 18 is turned off by the active mount 6
Drive stops. Therefore, the power consumption can be reduced by driving the active mount 6 only when necessary.

The second embodiment shown in FIG. 6 is different from the first embodiment in the installation position of the normally open switch 18, and the switch 18 is provided only between the cam position sensor 17 and the signal generator 16. It is provided. Switching on / off of the switch 18 is similarly performed by the switching device 21.

[0019]

According to the drive control device in the active vibration damping device for the internal combustion engine of the vehicle according to the present embodiment, the active type control device is provided only in the predetermined internal combustion engine low rotation speed region or the predetermined internal combustion engine rotation acceleration / deceleration region. Since the anti-vibration device is driven, not only good vehicle performance can be maintained, but also power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a four-point mount engine suspension system according to the present embodiment.

FIG. 2 is a sectional view showing a rear active mount used in this embodiment.

FIG. 3 is a control block circuit diagram of the rear active mount according to the first embodiment.

FIG. 4 is a control block circuit diagram showing an example of a switching device in the control block circuit shown in FIG.

5 is a diagram showing a relationship between an engine tachometer voltage and a filter output voltage in the high pass filter in the control block circuit shown in FIG.

FIG. 6 is a control block circuit diagram of a rear active mount according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Engine as an internal combustion engine, 6 Rear active mount as an active vibration isolator, 10 Piezoelectric element laminated body, 16 Signal generator as an active vibration isolator drive means, 17 Cam position sensor, 18 switch,
19 amplifier, 20 power supply, 21 switching device, 22 comparator as first discriminating means, 23 comparator as second discriminating means, 24 comparator as third discriminating means, 26 OR circuit as control means.

Claims (1)

[Claims] 1. An active vibration isolation device for an internal combustion engine of various vehicles capable of switching dynamic characteristics, which outputs a drive signal when it is determined that the rotational speed of the internal combustion engine is in a low rotational speed region below a predetermined value. A second determining means for outputting a drive signal when it is determined that the rotational acceleration of the internal combustion engine is in an acceleration region of a predetermined value or more; and a deceleration for which the rotational deceleration of the internal combustion engine is a predetermined value or less. The control output transmission from the active vibration isolation device driving unit is permitted by the third discriminating unit that outputs a driving signal when it is determined that the region is in the area, and the driving signal from any of the driving signals from each discriminating unit A drive control device in an active vibration control device for an internal combustion engine of various vehicles, comprising: a control means.