JP2639300B2 - Drive control device for active vibration isolator of internal combustion engine of various vehicles - Google Patents

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 for an internal combustion engine (hereinafter also referred to as an engine mounting) for attenuating vibration transmitted from an internal combustion engine (hereinafter also referred to as an engine) to a vehicle compartment in various vehicles. The present invention relates to a mold vibration isolator.

[0002]

2. Description of the Related Art Conventionally, in an engine mounting using such an active vibration isolator (hereinafter also referred to as an active mount), when vibration from an engine is applied to the active mount, the active mount is vibrated following the engine vibration. Thus, the vibration transmitted from the engine to the vehicle body is attenuated.
Such an active mount can switch dynamic characteristics, and can maintain good vehicle performance as performance requirements increase. Such an engine mounting is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 61-1751. The active mount shown as a vibrator in the publication is driven only in a low rotation speed region when the engine is idling. Therefore, since the exciter is not driven in a region other than the region, power consumption can be reduced.

[0003]

However, in order to maintain good vehicle performance, vibrations generated during acceleration and deceleration cannot be neglected.

An object of the present invention is 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 vibration isolator for supporting an internal combustion engine of various vehicles, and the active vibration isolator switches dynamic characteristics by transmitting a control output from a driving means. Is available.

The drive control device of the active vibration isolator includes an operation state output means, an acceleration / deceleration determination means, and a control means. The operating state output means controls the rotation speed of the internal combustion engine.
A comparison value that exceeds a predetermined reference value when it rises or falls sharply
, While rapidly increasing or decreasing the rotation speed.
After the descent is completed, the comparison value is output while being gradually reduced . The acceleration / deceleration determining means performs the operation
The comparison value output from the status output means exceeds the reference value
Of if it is determined that the acceleration region or the deceleration region that
And it outputs the actual driving signal. The control means
When a drive signal is output from the acceleration / deceleration determining means
Is active type from active vibration isolator driving means by map control
While allowing the control output to be sent to the anti-vibration device,
In a steady state in which the drive signal is not output from the determination means,
The power supply to the active vibration isolator is stopped .

[0007]

Therefore, according to the present invention, the vehicle suddenly accelerates or decelerates.
Then, while the active vibration isolator is driven,
Even if the state ends, the driving state of the active vibration isolator
Power supply to the active vibration isolator
Is stopped.

[0008]

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

In the horizontal engine mounting of the FF vehicle engine shown in FIG. 1, a left passive mount 3 and a right passive mount 4 are provided 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 shaft 2.
And is 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. The rear active mount 6 will be outlined. A rubber ring 8 is mounted on an annular base plate 7, and a movable body 9 is mounted on 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. A piezoelectric element laminate 10 is erected inside the support cylinder 9a, and a movable platen 11 is attached to the upper end of the piezoelectric element laminate 10 inside the inner ring 9b. A gap between the outer periphery of the movable platen 11 and the inner periphery of the inner ring 9b is closed by a rubber seal 12. A piston 13 is attached to the center of the cover 9d via a rubber cylinder 14. A liquid chamber 15 is formed between the cover 9d and the movable platen 11. Piston 13
Is applied to the rubber ring 8 via the movable body 9, and the rubber ring 8 is bent by a predetermined amount.

As shown in FIG. 3, a cam position sensor 17 for generating an ignition signal synchronized with an engine stroke is connected to a 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 to be applied to the piezoelectric element stack 10 by well-known map control based on the calculated values. I 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.

FIG. 4 shows an example of the switching device 21. In this switching device 21 , the first comparator 22
Second and third comparators constituting acceleration / deceleration determination means
23 , 24 , the engine tachometer voltage Vo is input to the first comparator 22, and the operating state
The signal is input to the second and third comparators 23 and 24 via a high-pass filter 25 as output means . In the high-pass filter 25, as shown in FIG. 5, when the engine tachometer voltage Vo increases during acceleration, the comparison value
And it is outputted as the filter output voltage Vf + Vfa of the engine tachometer voltage Vo decreases during deceleration, so that the filter output voltage Vf is output as -Vfr. Also, as shown in FIG.
The pressure Vo rises during acceleration or decreases during deceleration.
When the process is completed, the output voltage Vf gradually becomes +
Vf or -Vf decreases toward zero value
You. The filter output voltage Vf is equal to the second and third
Are input to the comparators 23 and 24.

The first comparator 22 predicts the engine tachometer voltage when the engine speed at which the vibration increases and adversely affects the vehicle performance is a predetermined value N (for example, 2000 rpm). 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 exists 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). Drive signal).

The second comparator 23 predicts the engine tachometer voltage at the time of rapid acceleration, which increases the vibration and adversely affects the vehicle performance, and inputs the predicted acceleration reference voltage + Va. Then, the second comparator 23 calculates the reference voltage + Va and the filter output voltage +
Compared with Vfa, when it is determined that this voltage + Vfa is in the acceleration region Qa equal to or higher than the voltage + Va, the output signal B is set to the high level, and when it is determined that it is not the same, the output signal B is set to the low level.

The third comparator 24 predicts the engine tachometer voltage at the time of rapid deceleration that has a large vibration and adversely affects the vehicle performance, and inputs the predicted deceleration reference voltage Vr. Then, the third comparator 24 compares the reference voltage −Vr with the filter output voltage −V
fr, and when 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.
To low level.

The output signals A, B, and C of the comparators 22, 23, and 24 are input to an OR circuit 26, respectively. The output signal Z of the OR circuit and the output signals A,
The logical sum Z = A + B + C holds between B and C. Therefore, when at least one of the output signals A, B, and C is at a high level, the output signal Z of the OR circuit 26 is also at a high level. When each of the output signals A, B, and C is at a low level, the output signal Z of the OR circuit 26 is also at a low level. When the output signal Z is at a 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 according to the present embodiment, whether the engine speed is equal to or less than the predetermined value N, the engine rotational acceleration is equal to or more than the predetermined value α,
Only when the engine rotation deceleration is below the predetermined value -α,
Each normally open switch 1 is output by the output signal Z of the switching device 21.
8, the piezoelectric element laminate driving voltage is applied from the signal generator 16 and the active mount 6 is driven to maintain good vehicle performance. On the other hand, in other cases where the influence of vibration is small, that is, in a steady state , each switch 18 is turned off by the output signal Z of the switching device 21 and the driving of the active mount 6 is stopped. Therefore, the power consumption can be reduced by driving the active mount 6 only when necessary. Moreover, the acceleration state or the deceleration state ends.
However, the drive of the active mount 6 is not stopped immediately.
Therefore, when switching dynamic characteristics based on map control,
It is also effective as a measure against vibration.

The second embodiment shown in FIG. 6 differs 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. Is provided. The turning on and off of the switch 18 is similarly performed by the switching device 21.

[0019]

According to the drive control apparatus for the active vibration isolator of the internal combustion engine of various vehicles according to the present invention , rapid acceleration / deceleration is achieved.
Occasionally, the active vibration isolator is driven ,
For a while after the operation is completed, the driving state of the active vibration isolator is maintained.
Since the lifting, not only it can maintain good vehicle performance, power to the active vibration isolation system during steady in a subsequent
Since the supply itself is stopped, power consumption can be reliably reduced.

[Brief description of the 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 the embodiment.

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

FIG. 4 is a control block circuit diagram illustrating an example of a switching device in the control block circuit illustrated in FIG. 3;

FIG. 5 is a diagram showing a relationship between an engine tachometer voltage and a filter output voltage in a high-pass filter in the control block circuit shown in FIG. 4;

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

[Explanation of symbols]

REFERENCE SIGNS LIST 1 engine as internal combustion engine, 6 rear active mount as active vibration isolator, 10 piezoelectric element stack, 16 signal generator as active vibration isolator driving means, 17 cam position sensor, 18 switch, 1
9 amplifier, 20 power supply, 21 switching device, 22 first comparator, 23 second comparator as acceleration / deceleration determining means, 24 third comparator as acceleration / deceleration determining means. /> Parator, 25 High-pass filter as operating state output means
Filter, OR circuit as a 26 control unit.

Claims (1)

(57) [Claims] 1. An active vibration isolator for an internal combustion engine of various vehicles capable of switching dynamic characteristics, wherein a predetermined base value is set when the rotation speed of the internal combustion engine rapidly increases or decreases.
While continuously outputting the comparison value exceeding the reference value,
After the number jumps or drops, the comparison value
Secondly, the operating state output means for outputting while reducing the value, and the comparison value output from the operating state output means being the reference value
It is determined that the acceleration or deceleration exceeds the value.
A deceleration determination unit for outputting a driving signal only if, when the driving signal is outputted from the acceleration determining means
Is active type from active vibration isolator driving means by map control
While allowing the control output to be sent to the anti-vibration device,
In a steady state in which the drive signal is not output from the determination means,
A drive control device for an active vibration isolator of an internal combustion engine of various vehicles, comprising: control means for stopping power supply to the active vibration isolator.