KR19990015159A - Engine Alphm interlocking type intake noise reduction device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resonance apparatus for reducing intake noise of an engine, and more particularly, to an engine intake noise reduction apparatus configured to vary an area of an inlet of two resonance boxes.

An automobile having an engine, an air purifier, an intake tube, and a resonance box installed in the intake tube, comprising: engine oil detection means; A resonance box having two different volumes, a neck area varying means for adjusting a neck area of the resonance box, a driving device for driving the neck area varying means, And a controller for controlling the driving device so as to increase the neck area of the resonance box as the engine temperature rises according to a result of comparison between the detection result from the engine temperature detection unit and the neck area detection unit And a controller for controlling the intake air amount of the engine.

Description

Engine Alphm interlocking type intake noise reduction device

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resonance apparatus for reducing intake noise of an engine, and more particularly, to an engine intake noise reduction apparatus configured to vary an area of an inlet of a resonance box.

The present invention provides two resonance boxes and controls the size of the inlet of the resonance box to observe the revolutions per minute (RPM) of the engine indicating the state of the intake noise varying with the number of revolutions of the engine, And to provide an engine noise-canceling intake noise damping device capable of setting a frequency band.

In the conventional automobile, noise is generated by the flow of the fluid sucked into the cylinder at the intake valve inlet of the engine, and the noise at this time is related to the rotation frequency of the engine.

The frequency component that occupies most of the engine intake noise varies in the range of the engine revolution per minute from 1500 RPM to 6000 RPM, that is, from 50 Hz to 200 Hz, and the range of the noise also changes as the engine revolutions per minute changes.

Therefore, in order to reduce the intake noise of the engine, the conventional automobile has a resonance box in the intake duct at the inlet of the air cleaner as shown in Fig. 1 in order to improve the quietness of the vehicle.

Generally, the frequency of the noise, which is mainly reduced in the resonance box, is determined by the physical structure of the resonance box, and the related equation is determined by the following equation.

At this time, in Equation 1, f Is a reduced frequency, c However, S Is the neck area of the entrance of the resonance box, L The length of the resonance box inlet, V Is the volume of the resonance box.

2A and 2B are diagrams showing the states of the intake noise when no conventional resonance box is installed and the state of intake noise when the resonance box is installed, with respect to the frequency band of the intake noise.

FIG. 2B shows a case where the attenuation frequency is set to 120 Hz, and the noise level at 120 Hz is theoretically 0. However, since the noise can not be attenuated over several frequency bands at the same time, the noise level in other frequency ranges can not be attenuated much.

In other words, the intake noise of a car changes with the change in the flow rate of the engine due to the change in the number of revolutions of the engine, and accordingly the flow rate also changes, so that the frequency band to be reduced also changes. The resonance box described above is designed to reduce the frequency by selecting a frequency that occupies the largest portion of the noise at the rotational speed band.

Therefore, the frequency of the noise changes according to the number of revolutions of the engine, so that the effect of reducing noise is relatively low.

Ultimately, there has been a demand for a certain resonance box to be brought to the resonance box in accordance with the frequency band that is most suitable for reducing the intake noise of the current state according to the speed of the changing engine.

The present invention is based on the above-described need, and it is an object of the present invention to provide two resonance boxes having different volumes and to change an area of a neck portion as an entrance thereof, And an intake air amount of the engine is controlled to be most suitable for attenuation.

1 is a schematic cross-sectional view of a conventional resonance box

2A is a graph showing the intake noise level of a vehicle in accordance with engine engine

Fig. 2B is a graph showing the intake noise reduction state by the conventional resonance box

3 is a view showing a control driving unit of an intake noise reduction apparatus having two resonance boxes according to the present invention

4A is a graph showing the intake noise reduction state according to the use of the engine RPM interlocking type intake noise reduction apparatus according to the present invention

4B is a graph showing the intake noise reduction state when the engine RPM interlocking type intake noise reduction apparatus according to the present invention is controlled in two stages

FIG. 4C is a diagram showing a state in which the engine RPM interlocking type intake noise reduction apparatus according to the present invention is structured by three or more stages of intake air noise reduction states

FIG. 5 is a view showing an embodiment of an intake noise reducing apparatus having two resonance boxes according to the present invention, and is a detailed drawing of a control input unit and a control drive unit

6 is a block diagram showing a schematic configuration of an intake noise reducing apparatus according to the present invention

Fig. 7 is a circuit diagram for explaining control of the intake noise reducing apparatus of the embodiment according to Fig. 5; Fig.

DESCRIPTION OF THE REFERENCE NUMERALS

1: intake duct 2: resonance box

3: Neck 4, 8: neck area variable plate

5, 11: reciprocating rod 6: driving device

12, 12 ': position detection switch 14: first variable plate

15: second variable plate 27: drive motor

An automobile having an engine, an air cleaner, an intake tube, and a resonance box provided in the intake tube, comprising: engine oil detection means; A resonance box having two different volumes, a neck area varying means for adjusting a neck area of the resonance box, a driving device for driving the neck area varying means, And a controller for controlling the driving device so as to increase the neck area of the resonance box as the engine temperature rises according to a result of comparison between the detection result from the engine temperature detection unit and the neck area detection unit And a controller for controlling the intake air amount of the engine.

Preferably, the control device divides all the possible areas of the engine engine into two or more sections, pre-sets an appropriate noise attenuation frequency in each section to determine which section of the current engine engine corresponds to which section, Wherein the control device is a control device for driving the drive device to obtain the frequency of the intake air.

Further preferably, the engine-air-intake-type intake noise reducing apparatus according to the present invention comprises an engine, an air purifier, an intake tube, and a resonance box provided in the intake tube, A resonance box, a neck area variable plate for adjusting the neck area of the two resonance boxes, a reciprocating rod reciprocatingly integrated with the neck area variable plate, a position detection sensor for detecting the position of the reciprocating rod, A driving motor for driving the reciprocating rod, a driving motor for driving the reciprocating rod, a driving motor for driving the reciprocating rod, a driving motor for driving the reciprocating rod, And a control device for driving the engine-driven intermittent intake noise canceling device for an automobile.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure and operation of an engine noise-coupled intake noise canceling device according to the present invention will be described in detail with reference to the accompanying drawings.

The relationship between the size of the neck area, which is the cross-sectional area of the inlet of the resonance apparatus, and the reduction frequency of the intake noise will be described as follows.

The relationship between the physical component of the resonator and the abatement frequency is already described in Eq. (1), and it can be seen that the abatement frequency is proportional to the square root of the neck area of the resonance box when the other conditions are constant.

As can be seen from the above equation (2), when the resonance box neck area is minimized S = s ) ≪ / RTI > f If you double your neck area ( S = 2s ) And the neck area is quadrupled ( S = 4s ) Are about < RTI ID = 0.0 > about & 1.4 f Wow 2 f .

Therefore, if the fundamental attenuation frequency is set to 100 HZ, doubling the neck area of the inlet will result in 144 Hz being the attenuation frequency, and quadrupling the entrance area will be the attenuation frequency of 200 Hz.

Therefore, it can be seen that the effect of noise attenuation can be varied by varying the neck area.

That is, if the current RPM of the engine is detected and the current neck area suitable for the current RPM is calculated and the neck area can be changed by an appropriate means, the effect of damping the intake noise of the engine in the entire RPM region can be obtained.

On the other hand, since the engine intake noise attenuation region is determined by the shape of the resonance box, a single resonance box can not attain the simultaneous attenuation effect over various regions.

However, if two resonance boxes for attenuating the engine intake noise are installed as shown in FIG. 3, such conventional disadvantages can be overcome.

In other words, if two resonance boxes having different volumes from each other are provided, the two resonance boxes each exhibit a damping effect, so that a damping effect can be obtained in a wider area as shown in FIG. 4A.

However, the difference in volume between the two resonance boxes is due to the difference in resonance frequency due to the two resonance boxes f ) Is about 10 Hz so that the non-attenuated region between the two resonance frequencies is not too large.

FIG. 3 shows a variable engine intake noise damping device using the above-described principle. The neck area can be varied while reciprocally moving the neck area variable plate 4, thereby attenuating the intake noise in various areas. By using two resonance boxes (3) and (3 ') having different volumes, it is possible to widen the area of attenuation of sound in each region.

Fig. 5 is a diagram showing a structure of a resonance box according to an embodiment of the present invention, in which two resonance boxes having the above-described configuration are installed and the neck area, which is the control operation part in the case of controlling the neck area as the entrance of the resonance box, FIG.

According to the embodiment, the first variable plate 7 and the second variable plate 7 'that open the two throat openings and the reciprocating rod 11 that makes them reciprocate are included, and at the end of the reciprocating rod, A rack gear and a pinion gear are engaged, and these are operated by a motor (not shown) and a drive gear 10 that transmits power from the motor.

Switch-type position detection sensors 12, 12 ', 13 are provided on the reciprocating rod to transmit the current position to the control device.

7 is a circuit diagram for controlling the engine noise-coupled intake-air noise damping device having the control operation portion of the above-described embodiment. The position detection sensors 12 and 12 'configured by the above two upper limit and lower limit switch types, And an engine ALM sensor as a control input unit.

The input value from the engine ALM sensor is compared in the comparator, and when the engine temperature is equal to or higher than the reference value, the high signal (H) is emitted and the low signal (L) is emitted.

If the upper limit switch 12 'is not turned on even if the current engine air temperature value is smaller than the reference value of the comparator, the drive motor is rotated forward to advance the reciprocating rod. On the other hand, The drive motor is reversed to reverse the reciprocating rod.

As a result, the intake noise reduction effect as shown in FIG. 4B can be obtained by dividing the entire noise range of the engine into two.

If this step is further divided into a plurality of sections and composed of multiple stages, the noise attenuating effect as shown in FIG. 4C can be obtained.

Although electric motors are used as driving devices in the above-described embodiments, step motors suitable for digital control or driving devices using electromagnets or the like may be used.

In addition, although the switch type suitable for the two-stage configuration is proposed as the position detection sensor, any of a variable resistance type, a photoelectric type, and a piezoelectric type may be used.

In the present embodiment, the neck area is indirectly obtained by using the position detecting sensor. However, the neck area is assumed to have a rectangular shape, and if the shape of the neck part is rectangular, the neck area can be directly or indirectly obtained .

A digital control method using a microcomputer as shown in Fig. 6 is suitable for carrying out control over a wide range of intake noise as much as possible through continuous control.

6, the control input section is a neck area detecting means 16 and an engine N N detecting sensor, and the control operating section is a drive device for driving the neck area varying means 24. The electronic control device 19 is an engine A comparator 21 for comparing a current engine arpeggio value with a predetermined reference value to determine a control region, and a comparator 21 for comparing the present engine arpeggieter with a current neck area, And a control unit (20) for controlling the drive unit (23) so that the neck area is adapted to the previously set control area.

In particular, the engine noise-coupled intake noise reduction apparatus having two resonance boxes according to the present invention has resonance frequency bandwidth f ), Which is larger than the case of the continuous control described above.

It is possible to vary the neck area, which is the size of the inlet of the resonance box, so that the engine noise is detected and the appropriate noise attenuation frequency is formed, and the resonance frequency bandwidth of each section is widened by using two resonance boxes So that the effect of attenuating high intake noise can be obtained.

Claims (10)

1. An automobile having an engine, an air cleaner, an intake pipe, and a resonance box provided in the intake pipe, Engine oil detection means; A resonance box having two different volumes, a neck area varying means for adjusting a neck area of the resonance box, a driving device for driving the neck area varying means, And a controller for controlling the driving device so as to increase the neck area of the resonance box as the engine temperature rises according to a result of comparison between the detection result from the engine temperature detection unit and the neck area detection unit And a control device for controlling the intake air amount of the engine. The control apparatus as claimed in claim 1, wherein the control device divides all the possible regions of the engine engine into two or more sections and pre-sets an appropriate noise attenuation frequency in each section to determine which section of the engine engine corresponds to which section , And a drive device for driving the drive device to obtain a suitable damping frequency. The engine noise interlocking type as claimed in claim 1, wherein the neck area varying means is a neck area varying means that functions to vary the neck area of the resonance box in three stages of basic, double, and quadruple Abatement device The intake-air noise reducing apparatus according to any one of claims 1 to 3, wherein the drive unit is a drive unit using an electromagnet 4. An engine noise canceling type intake noise reduction apparatus for an automobile according to any one of claims 1 to 3, characterized in that the drive apparatus is a drive apparatus including a step motor 4. The intake-pipe noise reduction apparatus according to any one of claims 1 to 3, wherein the drive unit is a drive unit using a DC motor 1. An automobile having an engine, an air cleaner, an intake pipe, and a resonance box provided in the intake pipe, And a control unit for controlling the position of the reciprocating rod so that the position of the reciprocating rod can be adjusted by changing the position of the reciprocating rod A driving motor for driving the reciprocating rod, a driving motor for driving the reciprocating rod, a driving motor for driving the reciprocating rod, a driving motor for driving the reciprocating rod, And a control device for driving the drive device so as to have a neck area. The engine noise reduction apparatus according to claim 7, wherein the position detection sensor is a position detection sensor composed of two switches for detecting two positions, and the interval set in the control device is two. Device 9. The resonance box according to any one of claims 1 to 3, 7, and 8, wherein the two resonance boxes are in close contact with each other, Wherein the engine is an area variable plate. 9. The resonator box according to any one of claims 1 to 3, 7, and 8, wherein the two resonance boxes are independent resonance boxes, Wherein the engine is an area variable plate.