KR200148695Y1 - Muffler variable apparatus of a car with variable plate - Google Patents

Abstract

The present invention relates to a muffler variable device of a vehicle having a variable diaphragm.

The present invention provides a muffler variable device for a vehicle having a variable diaphragm which can obtain an optimum noise reduction over the driving area of the vehicle by directly adjusting a muffler variable diaphragm by directly sensing a sound pressure signal of the exhaust gas coming into the muffler. There is a purpose.

In order to achieve the above object, the present invention, in the muffler coupled to the distal end of the exhaust pipe for discharging the exhaust gas emitted from the engine into the atmosphere, the negative pressure sensor fixedly coupled to the exhaust pipe front end for sensing the sound pressure of the exhaust gas; ; A plurality of fixed diaphragms having a diaphragm formed inside the muffler and having a fixed through hole at one side thereof; A variable diaphragm formed between the fixed diaphragms of the muffler and slidably flowing and having a variable through hole; And sliding means for reducing the exhaust sound of the exhaust gas by sliding the variable diaphragm according to the sound pressure sensed by the sound pressure sensor.

Description

Muffler Variable Device of Vehicle with Variable Diaphragm

The present invention relates to a muffler variable device of a vehicle having a variable diaphragm, and more particularly, by adjusting a muffler variable diaphragm by directly sensing a sound pressure signal of exhaust gas flowing into the muffler, thereby reducing noise optimally throughout the driving area of the vehicle. It relates to a muffler variable device of a vehicle having a variable diaphragm can be obtained.

In general, the exhaust manifold of a vehicle draws exhaust gas discharged from an exhaust port into a muffler. It is usually cast-iron and in very few high-performance engines and racing cars is formed by bending stainless steel or steel pipes.

The exhaust manifold also acts as a muffler for each cylinder, summed up with a few exhaust gases emitted via the exhaust port. In many cases, the exhaust manifold of a mass production engine has a number of cylinders for the exhaust port and one or two mufflers.

Exhaust gas emitted from the exhaust manifold is exhausted through the exhaust pipe into the muffler and into the atmosphere. The exhaust gas exiting the exhaust port into the exhaust manifold radiates heat from the exhaust manifold, but is hot and high in pressure. The flow rate of the exhaust gas is very correct and if it is released into the atmosphere as it is, the exhaust sound is high and the city can not be driven as it is.

Exhaust pipes are mostly made by bending steel pipes. Prior to the vehicle emissions regulations, exhaust equipment was exhaust ports, exhaust manifolds, exhaust pipes, premufflers, and mufflers. Due to emissions regulations, most cars employ catalytic mufflers to purify the emissions. The catalyst muffler is installed where the pre-muffler has been installed so far, and the exhaust gas is reacted with the catalyst and sent to the main muffler.

As a catalytic muffler (catalyst converter), a three-way catalyst is generally used. The ternary catalyst attaches heavy metals such as platinum, palladium, and rhodium to a bed of honeycomb and places it in a steel case. The three-way catalyst is located just behind the exhaust manifold. This is because the temperature of the exhaust gas is still close to 600 ° C., and oxidation is promoted by the catalyst, so that the exhaust gas is easily burned by introducing the air secondarily.

The exhaust gas passing through the catalyst muffler passes through the exhaust pipe and enters the main muffler. The muffler depressurizes the exhaust again, releases it into the atmosphere after making noise. The appearance of the muffler of a commercial car is a box of fairly thick steel. The muffler is divided into several spaces, and the exhaust gases pass through this space, reducing pressure and absorbing noise. In the muffler, the exhaust resistance is increased in the process of absorbing the noise of the exhaust gas, which reduces the engine power. This energy is about 5-10% of the engine's output.

The noise effect of the muffler is higher the more energy is lost. Therefore, the exhaust sound of the engine at the time of driving can be made smaller as a vehicle equipped with an engine having a large displacement with a margin of engine output. In addition, even if the displacement is large, like a sports car, if you want to reduce the output loss of the engine as much as possible, the muffler with less resistance is installed at the expense of the muffler noise effect. In addition, the sound quality of the exhaust sound can be changed by adjusting the bulkhead and volume inside the muffler. As a result, it can be set as a low exhaust sound like a sports car or a heavy exhaust sound corresponding to a luxury car.

However, such a conventional muffler has a problem that the noise is severe when the internal partition and the volume is fixed and emits exhaust noise regardless of whether the engine output is low or high.

The present invention is devised to solve the above problems, the present invention is to directly sense the signal of the negative pressure of the exhaust gas coming into the muffler to adjust the muffler variable diaphragm to obtain the optimum noise reduction throughout the driving area of the vehicle It is an object of the present invention to provide a muffler variable device of a vehicle having a variable diaphragm.

In order to achieve the above object, the present invention, in the muffler coupled to the distal end of the exhaust pipe for discharging the exhaust gas emitted from the engine into the atmosphere, the negative pressure sensor fixedly coupled to the exhaust pipe front end for sensing the sound pressure of the exhaust gas; ; A plurality of fixed diaphragms having a diaphragm formed inside the muffler and having a fixed through hole at one side thereof; A variable diaphragm formed between the fixed diaphragms of the muffler and slidably flowing and having a variable through hole; And sliding means for reducing the exhaust sound of the exhaust gas by sliding the variable diaphragm according to the sound pressure sensed by the sound pressure sensor.

1 is an enlarged cross-sectional view showing the main portion of the embodiment according to the present invention.

Explanation of symbols on the main parts of the drawings

10: muffler

12: fixed diaphragm

13: fixed through hole

14: variable diaphragm

15: variable through

20: sliding means

30: sound pressure sensor

40: exhaust pipe

50: body

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is an enlarged cross-sectional view showing the main portion of the embodiment according to the present invention.

The present invention is a muffler (10) coupled to the front end of the exhaust pipe 40 for discharging the exhaust gas emitted from the engine to the atmosphere, fixed pressure coupled to the front end of the exhaust pipe 40 senses the negative pressure of the exhaust gas A sensor 30; A plurality of fixed diaphragms 12 formed in the muffler 10 with a fixed through hole 13 at one side thereof; A variable diaphragm 14 formed between a fixed diaphragm 12 of the muffler 10 and slidingly sliding and having a variable through hole 15; In accordance with the sound pressure sensed by the sound pressure sensor 30 is provided with a sliding means 20 for sliding the variable diaphragm 14 to reduce the exhaust sound of the exhaust gas.

The sliding means 20 is preferably formed of a hydraulic cylinder.

When the exhaust gas generated in the engine reaches the muffler 10 through the exhaust pipe 40, the negative pressure sensor 30 at the tip side exhausts before reaching the muffler 10 fixed to the vehicle body 50. The sound pressure of the exhaust gas inside the pipe 40 is sensed.

The main controller (ECM) discriminates as much as the sound pressure detected by the sound pressure sensor 30 is high or low to drive the sliding means 20.

At this time, the sliding width of the variable diaphragm 14 fixed to one side of the sliding means 20 is determined to slide only the predetermined width.

Exhaust gases in the exhaust pipe 40 are guided into the muffler 10 and pass through the fixed through holes 13 of the plurality of fixed diaphragms 12 to be canceled with each other, so that the negative pressure and the temperature are lowered, and the temporary barrier membrane 14 that flows. It is significantly attenuated while passing through the variable through hole 15.

The sliding flow width is a structure in which the structures of the fixed membrane 12 and the temporary barrier membrane 14 inside the muffler 10 are changed to minimize the noise of the exhaust gas emitted through the muffler 10 under the current situation. .

The sound pressure of the exhaust gas in the exhaust pipe 40 is always sensed so that the structure of the muffler 10 is appropriately changed, thereby achieving optimum noise reduction throughout the vehicle driving area.

According to the present invention as described above, by controlling the muffler variable diaphragm by directly sensing the signal of the sound pressure of the exhaust gas entering the muffler, there is an effect that can obtain the optimum noise reduction throughout the driving area of the vehicle.

Claims (1)

In the muffler (10) coupled to the tip of the exhaust pipe 40 for discharging the exhaust gas emitted from the engine to the atmosphere, A negative pressure sensor 30 fixedly coupled to a distal end of the exhaust pipe 40 to sense a negative pressure of the exhaust gas; A plurality of fixed diaphragms 12 formed in the muffler 10 with a fixed through hole 13 at one side thereof; A variable diaphragm 14 formed between a fixed diaphragm 12 of the muffler 10 and slidingly sliding and having a variable through hole 15; Muffler variable device of a vehicle having a variable diaphragm characterized in that it comprises a sliding means 20 for sliding the variable diaphragm 14 in accordance with the sound pressure sensed by the sound pressure sensor 30 to reduce the exhaust sound of the exhaust gas. .