KR19980027381U - Variable noise reduction device for automobile - Google Patents

Abstract

The present invention relates to a variable vehicle noise reduction device which is connected directly to the catalytic converter of the vehicle so that the exhaust noise can be reduced according to the vehicle speed.

The object of the present invention is to attenuate the noise according to the change pressure of the exhaust gas during engine operation.

That is, in the vehicle noise reduction device installed in the exhaust pipe 50 connected immediately after the catalytic converter 60 of the vehicle to attenuate exhaust noise,

First and second exhaust pipes 51 and 52 formed in parallel from the catalytic converter 16;

First and second silencers 11 and 12 mounted to the exhaust pipes 51 and 52,

A pressure sensor 20 for measuring the pressure of the exhaust gas flowing into the first silencer 11,

A valve 13 formed in the second exhaust pipe 52 so as to control the flow amount of the exhaust gas flowing into the second silencer 12,

Characterized in that the configuration is made of an electronic control device 30 to control the valve 13 in response to the signal of the pressure sensor 20.

Description

Variable noise reduction device for automobile

The present invention relates to a variable vehicle noise reduction device which is connected directly to the catalytic converter of the vehicle so that the exhaust noise can be reduced according to the vehicle speed.

In general, when the exhaust gas is discharged from the vehicle, the exhaust gas is discharged at a speed of nearly sound speed, and when the exhaust gas is discharged to the atmosphere as it is, it expands rapidly and emits a violent sound so that the sound pressure, sound wave, and exhaust temperature are attenuated. It is provided with a silencer.

There are various types of structures of the silencer, but as shown in Figure 2 is usually made of a cylindrical steel plate of about 1mm, the shape is to be divided into several rooms the inside of most. Therefore, it is common to have a structure in which the exhaust gas gradually reduces the noise by causing interference of sound waves, a decrease in pressure fluctuations, a decrease in exhaust temperature, etc. each time the exhaust gas passes through the above rooms.

At this time, if the resistance of the silencer 10 is excessively large in order to increase the noise reduction effect, the noise may be reduced, but the resistance (back pressure) applied to the exhaust stroke is increased, thereby lowering the engine 40 output. Therefore, the silencer 10 is designed and manufactured based on a constant rotation speed of the engine 40 most frequently used.

However, the silencer 10 currently being used emits more exhaust gas when the driving region of the engine 40 is converted from medium speed to high speed to operate.

That is, in the high speed driving region, since more exhaust gases are discharged than the amount of exhaust gases that can be processed in the diameter of the manufactured silencer 10, there is a problem in that noise is emitted very badly at high speed.

Therefore, the present invention has been made in order to solve the above problems, and the object of the present invention is to attenuate the noise according to the change pressure of the exhaust gas during engine operation.

As a means for achieving the above object, the present invention is installed in the exhaust pipe connected immediately after the catalytic converter of the vehicle in the noise reduction device for automobiles to attenuate exhaust noise,

First and second exhaust pipes formed in parallel from the catalytic converter, first and second silencers mounted to the respective exhaust pipes, a pressure sensor to measure the pressure of the exhaust gas flowing into the first silencer, and a second And a valve formed in the second exhaust pipe so as to control the flow rate of the exhaust gas flowing into the silencer, and an electronic control device for controlling the valve by receiving a signal from the pressure sensor.

1 is an exemplary embodiment of mounting the silencer of the present invention

2 is a conventional silencer mounting

* Explanation of symbols for main parts of the drawings *

10: silencer 11: first silencer

12: second silencer 13: valve

20: pressure sensor 30: electronic control unit (ECU)

40: engine 43: exhaust manifold

51: first exhaust pipe 52: second exhaust pipe

60: catalytic converter

This will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a configuration according to the present invention, wherein 40 is an engine, 41 is a throttle body, and 42 is an intake manifold.

The exhaust pipe 50 directly connected to the catalytic converter 60 is composed of the first exhaust pipe 51 and the second exhaust pipe 52, but is connected in parallel.

The first and second silencers 11 and 12 are mounted to the exhaust pipes 51 and 52 connected in parallel, and the first silencer 11 to be mounted on the first exhaust pipe 51 is an engine. (40) When the rotational speed is low and medium speed during operation, it is installed to have a volume suitable for the amount of exhaust gas discharged, and the second silencer 12 mounted on the second exhaust pipe 52 converts the engine speed to a high speed range. When mounted so as to form a diameter that can cover the exhaust gas that can not be processed in the first muffler (11).

In the second exhaust pipe 52 that leads to the second silencer 12, the exhaust gas flows to the second silencer 12 when the operating area of the engine 40 is converted at a high speed and the emission of the exhaust gas increases. Alternatively, on the contrary, when the engine 40 operation region is changed from high speed to low / medium speed, a valve 13 is mounted to shut off the second exhaust pipe 52.

In addition, the pressure sensor 20 is mounted inside the first silencer 11 to check the pressure of the exhaust gas.

On the other hand, the pressure value checked by the pressure sensor 20 is sensed by the electronic control unit (ECU) 30 to grasp the operating state of the engine, and to open and close the valve 13 mounted in the second exhaust pipe 52. Do it.

Looking at the operation of the present invention is as follows.

When the vehicle is to be operated after starting, the operating area of the engine 40 is initially low and medium speed, so the valve 13 in the second exhaust pipe 52 is closed, and the exhaust gas is discharged through the exhaust pipe 50. It is discharged to the first silencer 11 via the first exhaust pipe 51.

On the other hand, the pressure sensor 20 attached to the first silencer 11 checks the pressure of the exhaust gas flowing to the first silencer 11 and sends the value to the ECU 30 so that the ECU 30 receives the first value. 2 Determine whether the valve 13 in the exhaust pipe 52 is opened or closed.

In order to operate the vehicle in a high speed region at low and medium speeds, increasing the engine speed increases the amount of exhaust gas and increases the exhaust gas pressure. In the ECU 30, the pressure sensor in the first silencer 11 is used. The ECU 30 opens the valve 13 in the second exhaust pipe 52 when the pressure value received by the pressure gauge 20 is greater than the pre-input low / medium speed pressure value. The exhaust gas that can not be extinguished in the second silencer (12) is also possible to flow to reduce the pressure of the exhaust gas as a whole to reduce the exhaust noise.

On the other hand, when the engine 40 runs at low / medium speed at high speed and the exhaust gas pressure value checked by the ECU 30 is less than or equal to the pressure value at low / medium speed, the ECU 30 is configured as a second. The valve 13 in the exhaust pipe 52 is closed to prevent the exhaust gas from flowing to the second silencer 12 so as to actively cope with the fluctuating amount of exhaust gas and the exhaust pressure.

According to the present invention as described above, by varying the passage area of the overall silencer 10 in accordance with the pressure change of the exhaust amount rapidly changing in accordance with the low, medium speed and high speed operation of the engine 40 so that the noise of the exhaust gas can be significantly reduced It works.

In addition, when the silencer 10 is manufactured, the diameter of the silencer 10 is greatly increased in consideration of the entire area of the engine. In the present design, the diameters of the silencers 11 and 12 are reduced. As the width increases, but as the height decreases, the dual effect is to increase the vehicle ground clearance.

Claims (1)

In the noise reduction device for automobiles installed in the exhaust pipe 50 connected immediately after the catalytic converter 60 of the automobile to attenuate exhaust noise, First and second exhaust pipes 51 and 52 formed in parallel from the catalytic converter 60; First and second silencers 11 and 12 mounted on the exhaust pipes 51 and 52; A pressure sensor 20 for measuring the pressure of the exhaust gas flowing into the first silencer 11, A valve 13 formed in the second exhaust pipe 52 so as to control the flow amount of the exhaust gas flowing into the second silencer 12, Variable noise reduction device for a vehicle characterized in that the configuration consisting of an electronic control device for controlling the valve 13 in response to the signal of the pressure sensor (20).