KR19990015167A - Engine Alphm interlocking type intake noise reduction device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance device for reducing intake noise of an engine, and more particularly, to an engine intake noise reduction device configured to vary the volume of a resonance box.

The present invention relates to an engine having an engine, an air cleaner, an intake tube, and a resonance box installed in the intake tube, the engine RPM detection means, the neck area varying means for adjusting the cross-sectional area of the resonance box inlet, A neck area detecting means for detecting a cross-sectional area of the neck which is an inlet of the resonance box; a comparison means for comparing a detection result from the engine RPM detecting means and the neck area detecting means with a set reference value; And controlling the driving device to increase the neck area of the resonance box as the engine RPM increases according to the result of the comparison.

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 device for reducing intake noise of an engine, and more particularly, to an engine intake noise reduction device configured to vary the width of an inlet of a resonance box.

The present invention aims to determine the state of the intake noise that varies according to the number of revolutions of the engine and to set the resonance frequency band linked to the number of revolutions per minute of the engine so as to reduce the intake noise of the engine and improve the quietness .

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 a plurality of frequency bands at the same time, the noise level in other frequency ranges can not be attenuated.

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-mentioned demand, which detects the revolution speed per minute of the engine and computes the neck area, which is the cross-sectional area of the inlet of the resonance box most suitable for reducing the noise of the present state of the engine, And to provide an engine noise-canceling intake noise reduction device for an engine.

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 state in which intake air noise is reduced by use of the engine RPM interlocking type intake noise reduction apparatus according to the present invention

4 is a view showing a control driving unit of the intake noise reducing apparatus according to the present invention;

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

6 is a diagram showing an embodiment of the intake noise reducing apparatus according to the present invention, and is a detailed drawing of the control input unit and the control drive unit

Fig. 7 is a circuit diagram for explaining control of the intake noise reduction apparatus of the embodiment according to Fig. 6; Fig.

DESCRIPTION OF THE REFERENCE NUMERALS

1: intake duct 2: resonance box

3: neck 4: neck area variable plate

5: reciprocating rod 6: driving device

17, 18, 19: position detection sensor 21, 21 ': return switch

22: latch 25: return switch

35: drive switch

The present invention provides a vehicle having an engine, an air cleaner, an intake tube, and a resonance box provided in the intake tube, the engine being provided with means for detecting engine oil, A neck area detecting means for detecting a cross-sectional area of a neck of an entrance of the resonance box, a neck area detecting means for detecting a cross-sectional area of the neck portion of the resonance box, And a control device for comparing the detection result from the detection means with the set reference value and controlling the drive device to increase the neck area of the resonance box as the engine air temperature rises according to the result, An interlocking type intake noise reduction device is provided.

Particularly, the present invention relates to an automobile having an engine, an air cleaner, an intake tube, and a resonance box provided in the intake tube, the automobile comprising: engine oil detection means; a neck area variable plate for adjusting the neck area of the resonance box; A plurality of position detecting sensors for detecting a position of the reciprocating rod; a driving motor for driving the neck area varying means; And a control device for predicting an appropriate noise attenuation frequency in each section to determine which section of the current engine engine corresponds to which section and to drive the driving device to obtain a suitable attenuation frequency An intake noise canceling device for an engine-driven engine of an automobile.

In this case, the control device preferably includes a switching circuit for controlling forward rotation of the drive motor, and a pair of switches provided around the reciprocating rod for interlocking to control the switching of the switching circuit A return switch for changing the rotational direction of the drive motor; a plurality of comparators for comparing the detection result of the engine arpeggiative detection means with a set reference value; And a logic circuit for performing a logical OR operation of a logical product of the logical inversion value of the output of the position detection sensor and the output of the comparator so that the neck area of the resonance box is suitable for attenuating noise according to the current engine noise. To be a control device for controlling the motor.

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.

Therefore, as can be seen from 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.

Considering that the noise frequency of the engine is usually 2,000 RPM to 6,500 RPM (the noise frequency range is 67 Hz to 217 Hz), the resonance box neck area is controlled in three stages of basic, basic and quadruple The noise attenuation effect can be obtained for the entire noise region of the engine.

This effect is shown in FIG. 3, and it can be confirmed that the effect of noise attenuation can be improved as compared with the effect in the conventional fixed type shown in FIG. 2B.

4 and 6, the neck area of the resonance box can be varied, and the structure of FIG. 5 or 7 is used to control the driving unit .

FIG. 4 is a view showing an installation state in which a driving unit of an engine noise interlocking type intake noise reduction apparatus according to the present invention is installed in a resonance box, and includes variable means for varying the neck area of the resonance box for interlocking with a change in RPM of the engine A neck area variable plate 4, a reciprocating rod 5, and a drive unit 6. [

The sectional shape of the inlet of the resonance box is not limited to a rectangular shape as shown in the figure, and the outer shape such as the neck length of the resonance box and the thickness of the variable plate may be modified based on the present invention.

FIG. 5 is a block diagram showing a schematic configuration of an engine noise-interrupting intake noise canceling apparatus of a vehicle according to the present invention, in which the control input unit includes engine oil detecting means 7 and neck diameter detecting means 8 of a resonance apparatus, And the driving unit is a drive unit which is a power source for driving the neck area varying means 13 for varying the neck area which is the neck cross-sectional area of the resonance apparatus described above. The control unit 9 has a setting unit, A comparison unit for comparing the input information from the input unit with a reference value, and a control unit for controlling the forward / backward movement of the drive unit according to the comparison result.

At this time, the conventional engine RPM detecting means 7 is used. The neck area detecting means 8 is for checking the area of the neck portion, and if the shape of the neck portion is rectangular as shown in Fig. 4, However, if the cross section of the neck is circular elliptical, etc., a separate calculation means is required.

The position detecting sensor may be a conventional method of measuring a variable resistance or the like.

The drive unit 6 is a power source for generating a reciprocating motion of the reciprocating rod, and an electric motor, such as a DC motor or a step motor, or a method using the electromagnetic force of the electromagnet and the restoring force of the spring can be used.

The control unit judges the area of the current engine intake noise based on the signals from the engine oil detection sensor 7 and the neck area detection unit 8 and determines the current engine intake air noise range based on the current engine revolution number And then controls the drive unit to maintain the neck area, which is the entrance of the resonance box, in the present state to an optimum state.

Generally, the control device and the driving device for this purpose have an advantage that the cost is increased but the configuration is simple by using the microprocessor and the step motor respectively.

In the above-mentioned control, a method of continuously controlling the area of the neck portion has been proposed. However, if the construction is complicated and the cost is high, the entire RPM region of the engine is divided into several sections and the position detection sensor, the servo motor, By using a circuit in a stepwise manner, a predetermined object can be realized.

FIGS. 6 and 7 show an example of such a stepwise control. In this example, the entire engine arpeggio region is divided into three sections, but the engine can be modified in five stages or seven stages.

6 shows the mounting state of the input unit and the driving unit except for the control unit. As the driving gear 23 rotates forward and reverse by the driving motor, the reciprocating rod 16 is rotated by the action of the pinion 24 and the rack So that the area of the neck 14 of the resonance box can be varied.

At this time, simple switch type position detection sensors 17, 18, and 19 are installed around the reciprocating rod at the intervals as shown in the figure.

Therefore, when the reciprocating rod is advanced in the present state and the electrode 20 is positioned on the position detection sensor 19, the neck area will be minimum, and when the minimum area is set as the basic S, When it comes back in contact with the position detection sensor 17, the area becomes four times as large.

Therefore, according to the above-mentioned equation (2), when the neck area is doubled and quadrupled, the attenuation frequencies are respectively 1,41 times and doubled.

Using this point, if the attenuation frequency is set to 100 Hz at the basic area, then 141 Hz is the attenuation frequency for a double area and 200 Hz is the attenuation frequency for a quadruple area.

Therefore, considering that the RPM of the engine is usually within the range of 2000 to 7000, a large effect can be obtained over the entire region, and Fig. 3 shows an example of such a case.

The circuit diagram for controlling the intake noise damping device having an input unit and a driving unit as shown in FIG. 6 includes position detection sensors 17, 18 and 19 constituted by switches as shown in FIG. 7, an engine temperature sensor 26, The comparators 28, 29 and 30, the logical product circuits 31, 32 and 33, the logical sum circuit 34, the drive switch 35, the return switch 25, And a transistor circuit.

The comparators 1, 2, 3 (28), 29, and 30 are for checking the current engine temperature. When a signal is inputted from the engine temperature sensor, only the comparator corresponding to the current engine temperature is high And the other outputs a low (L).

For example, comparator 1 28 may be set at 2,000 to 3,500 RPM, comparator 2 29 may be set at 3,500 to 5,000 RPM, and comparator 3 30 may be set at 5,000 to 6,500 RPM.

Since the output of the comparator and the output of the logically inverted position detection sensor are input to the AND circuits 31, 32 and 33, the outputs of the three AND circuits output the comparator high, The drive switch 35 is turned on via the logical summing circuit 34 only when the throttle variable valve is not positioned at the position corresponding to the current engine RPM value.

When the drive switch 35 is turned on, power is supplied to the motor to rotate forward. As a result, the advancing operation is continued until the throat variable plate is positioned at the desired position. When the retention arm 22 located on the reciprocating rod of Fig. 6 turns on the return switch 21, the return switch 25 of Fig. 7 is operated The direction of the power supply to the motor is changed so as to rotate the DC motor 36 in the reverse direction.

As a result, the damping frequency band is formed while the dc motor rotates in the forward rotation direction until the neck area of the resonance box becomes suitable for the current engine engine.

It is possible to vary the neck area, which is the size of the inlet of the resonance box, so that the noise reduction effect can be obtained over a wider range.

Claims (8)

1. An automobile having an engine, an air cleaner, an intake pipe, and a resonance box provided in the intake pipe, A neck area changing means for adjusting the neck area of the resonance box, a driving device for driving the neck area varying means, a neck area detecting means for detecting a neck area of the resonance box, And a control device for comparing the detection result from the engine-oil detecting means and the neck-area detecting means with a set reference value and controlling the driving device so as to increase the neck area of the resonance box as the engine temperature rises Wherein the intake air-intake noise reduction device 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, A plurality of position detecting sensors for detecting a position of the reciprocating rod, a neck area changing sensor for detecting a position of the reciprocating rod, a neck area changing sensor for adjusting a neck area of the resonance box, A drive motor for driving the variable means, and a drive motor for driving the variable means, wherein all regions capable of engine arpeggio are divided into a plurality of sections, an appropriate noise attenuation frequency in each section is preset, And a control device for driving the drive device to obtain the frequency of the intake air. 8. The control device according to claim 7, wherein the control device comprises: a switching circuit for controlling forward rotation of the driving motor; a pair of interlocking units provided around the reciprocating rod for controlling switching of the switching circuit, A plurality of comparators for comparing the detection result of the engine noise detection means with a set reference value; And a logic circuit for performing a logical AND operation of the logical product of the logical inversion value of the output of the position detection sensor and the output of the comparator so that the neck area of the resonance box is an area suitable for attenuating noise according to the current engine noise Wherein said control means is a control device for controlling said drive motor.