阅读说明：本技术 排气噪音调节装置及其方法、排气噪音调节系统和车辆 (Exhaust noise adjusting device and method, exhaust noise adjusting system and vehicle ) 是由 黄兴来 张宁 孙静 黄辉 曾志新 钟广桦 于 2019-04-15 设计创作，主要内容包括：一种排气噪音调节装置,包括共振箱、连接管、活动门板和激励控制器,共振箱内具有共振腔,连接管的一端与共振腔连通,连接管的另一端用于连通排气管,活动门板设置在共振腔中,激励控制器的驱动端与活动门板连接,激励控制器可驱使活动门板在共振箱内移动改变共振腔频率以及驱使活动门板振动。本发明的排气噪音调节装置,可根据待补偿的噪音频率进行匹配调节,增大了工作频率范围。本发明还涉及一种排气噪音调节系统、排气噪音调节方法和车辆。(The utility model provides an exhaust noise adjusting device, includes resonance box, connecting pipe, movable door plant and excitation controller, has the resonant cavity in the resonance box, and the one end and the resonant cavity intercommunication of connecting pipe, the other end of connecting pipe are used for communicateing the blast pipe, and movable door plant sets up in the resonant cavity, and the drive end and the movable door plant of excitation controller are connected, and the excitation controller can order about movable door plant and remove in resonance box and change the resonant cavity frequency and order about movable door plant vibration. The exhaust noise adjusting device can perform matching adjustment according to the noise frequency to be compensated, and the working frequency range is enlarged. The invention also relates to an exhaust noise adjusting system, an exhaust noise adjusting method and a vehicle.)

1. The exhaust noise adjusting device is characterized by comprising a resonance box, a connecting pipe, a movable door plate and an excitation controller, wherein a resonance cavity is arranged in the resonance box, one end of the connecting pipe is communicated with the resonance cavity, the other end of the connecting pipe is used for being communicated with an exhaust pipe, the movable door plate is arranged in the resonance cavity, a driving end of the excitation controller is connected with the movable door plate, and the excitation controller can drive the movable door plate to move in the resonance box to change the frequency of the resonance cavity and drive the movable door plate to vibrate.

2. The exhaust noise adjusting apparatus according to claim 1, wherein a rotation shaft is provided at one end of the movable door panel, the rotation shaft passes through the resonance box and is connected to the excitation controller, and a side edge of the movable door panel is in contact with a wall of the resonance box.

3. The exhaust noise adjusting apparatus according to claim 2, wherein the resonance box includes a bottom plate, a first side plate, a second side plate, a third side plate, a fourth side plate, and an arc-shaped cover plate, the first side plate and the second side plate are disposed in a flat shape and are opposed to each other, the third side plate and the fourth side plate are connected between the first side plate and the second side plate in a flat shape and are opposed to each other, the arc-shaped cover plate is disposed above the bottom plate, and both ends of the first side plate, the second side plate, the third side plate, and the fourth side plate are connected to the bottom plate and the arc-shaped cover plate, respectively.

4. The exhaust noise adjusting apparatus according to claim 3, wherein the first side plate has a length perpendicular to the bottom plate smaller than a length of the second side plate perpendicular to the bottom plate, one end of the arc-shaped cover plate is connected to the first side plate, the other end of the arc-shaped cover plate is bent in a direction close to the second side plate, and side edges of the movable door panel are in contact with the third side plate, the fourth side plate, and the arc-shaped cover plate, respectively.

5. The exhaust noise adjusting apparatus according to claim 4, wherein the third side plate and the fourth side plate have shaft holes at one ends thereof adjacent to the second side plate, and both ends of the rotation shaft are disposed through the shaft holes.

6. The exhaust noise adjusting apparatus according to claim 3, wherein a through hole is provided on the base plate, one end of the connection pipe is connected to the base plate, and the connection pipe is communicated with the through hole.

7. The exhaust noise control device according to claim 1, wherein the excitation controller is an electromagnetic mechanical device.

8. An exhaust noise control system comprising an on-board ECU and the exhaust noise control apparatus of any of claims 1 to 7, the on-board ECU being in electrical communication with the excitation controller, the on-board ECU sending sound frequencies and amplitudes to be compensated to the excitation controller, the excitation controller actuating the movable door panel to move and vibrate in accordance with the sound frequencies and amplitudes.

9. An exhaust noise adjusting method using the exhaust noise adjusting apparatus according to any one of claims 1 to 7, the exhaust noise adjusting method comprising:

collecting the frequency and amplitude of exhaust noise;

driving the movable door plate to move in the resonant tank by using the excitation controller according to the frequency of the exhaust gas noise, so that the resonant cavity frequency is the same as the frequency of the exhaust gas noise;

and driving the movable door plate to vibrate in the resonance box by using the excitation controller according to the amplitude of the exhaust gas noise.

10. A vehicle characterized by comprising the exhaust noise control apparatus according to any one of claims 1 to 7.

Technical Field

The invention relates to the technical field of tail gas noise control, in particular to an exhaust noise adjusting device and method, an exhaust noise adjusting system and a vehicle.

Background

The automobile exhaust system is an important component of an automobile, exhaust gas discharged by the exhaust system brings combustion noise to the tail of the automobile, order noise and friction noise with high sound pressure level are generated at the tail, the noise is transmitted to a passenger cabin, and the noise possibly excites the sound cavity mode of the passenger cabin to cause the resonance of the sound cavity of the passenger cabin, so that the NVH of the whole automobile is seriously influenced. Along with the improvement of living standard of people, the requirement of people on the whole vehicle is changed from an initial travel tool to a comfortable household necessity, so that the requirement on the noise of the whole vehicle is also improved besides the stricter requirement on the dynamic property of the vehicle type, and the whole vehicle is required to have pleasant noise in the running and accelerating processes.

At present, most vehicle types are provided with exhaust sound quality adjusting devices, for example, electromagnetic valves arranged on some vehicle types mainly reduce back pressure and flow noise and cannot compensate sound loss under certain rotating speeds; other vehicle types use front end exhaust pulsation as excitation to enable the resonant cavity to resonate and compensate exhaust sound, but the sound quality device can only compensate sound under a certain rotating speed or frequency, cannot change and compensate sound with different frequencies along with the change of the rotating speed or the frequency, and cannot adjust the amplitude of the sound, so that the sound quality adjustment is relatively limited.

Disclosure of Invention

In view of the above, the present invention provides an exhaust noise adjusting device, which can perform matching adjustment according to the noise frequency to be compensated, so as to increase the working frequency range.

The utility model provides an exhaust noise adjusting device, includes resonance box, connecting pipe, movable door plant and excitation controller, has the resonant cavity in the resonance box, and the one end and the resonant cavity intercommunication of connecting pipe, the other end of connecting pipe are used for communicateing the blast pipe, and movable door plant sets up in the resonant cavity, and the drive end and the movable door plant of excitation controller are connected, and the excitation controller can order about movable door plant and remove in resonance box and change the resonant cavity frequency and order about movable door plant vibration.

In the embodiment of the invention, one end of the movable door plate is provided with a rotating shaft, the rotating shaft penetrates through the resonance box and is connected with the excitation controller, and the side edge of the movable door plate is contacted with the wall of the resonance box.

In an embodiment of the present invention, the resonance box includes a bottom plate, a first side plate, a second side plate, a third side plate, a fourth side plate, and an arc-shaped cover plate, wherein the first side plate and the second side plate are arranged in a flat shape and opposite to each other, the third side plate and the fourth side plate are arranged in a flat shape and opposite to each other and connected between the first side plate and the second side plate, the arc-shaped cover plate is arranged above the bottom plate, and two ends of the first side plate, the second side plate, the third side plate, and the fourth side plate are respectively connected with the bottom plate and the arc-shaped cover plate.

In an embodiment of the present invention, a length of the first side plate perpendicular to the bottom plate is smaller than a length of the second side plate perpendicular to the bottom plate, one end of the arc-shaped cover plate is connected to the first side plate, the other end of the arc-shaped cover plate is bent toward a direction close to the second side plate, and side edges of the movable door plate are respectively in contact with the third side plate, the fourth side plate and the arc-shaped cover plate.

In an embodiment of the present invention, the third side plate and the fourth side plate are provided with a shaft hole at one end close to the second side plate, and two ends of the rotating shaft pass through the shaft hole.

In an embodiment of the present invention, the bottom plate is provided with a through hole, one end of the connecting pipe is connected to the bottom plate, and the connecting pipe is communicated with the through hole.

In an embodiment of the present invention, the excitation controller is an electromagnetic mechanical device.

The invention also provides an exhaust noise adjusting system, which comprises a vehicle-mounted ECU and the exhaust noise adjusting device, wherein the vehicle-mounted ECU is in telecommunication connection with the excitation controller, the vehicle-mounted ECU sends the sound frequency and the sound amplitude which need to be compensated to the excitation controller, and the excitation controller drives the movable door plate to move and vibrate according to the sound frequency and the sound amplitude.

The present invention also provides an exhaust noise adjusting method using the exhaust noise adjusting apparatus, the exhaust noise adjusting method comprising:

collecting the frequency and amplitude of exhaust noise;

driving the movable door plate to move in the resonant tank by using the excitation controller according to the frequency of the exhaust gas noise, so that the resonant cavity frequency is the same as the frequency of the exhaust gas noise;

and driving the movable door plate to vibrate in the resonance box by using the excitation controller according to the amplitude of the exhaust gas noise.

The invention also provides a vehicle comprising the exhaust noise adjusting device.

The excitation controller of the exhaust noise adjusting device drives the movable door plate to move to change the volume of the resonant cavity, so that the frequency of the resonant cavity can be matched and adjusted according to the noise frequency to be compensated, the volume of the resonant cavity is high in changing speed and efficiency, and the working frequency range of the exhaust noise adjusting device is enlarged.

Drawings

Fig. 1 is a schematic structural view of an exhaust noise adjusting apparatus of the present invention.

Fig. 2a to 2b are schematic sectional views illustrating the exhaust noise adjusting apparatus according to the present invention in operation.

Fig. 3 is a schematic view of a disassembled structure of the resonance box of the present invention.

FIG. 4 is a schematic view of an exhaust noise modulation system of the present invention.

FIG. 5 is a graph of sound pressure of tailpipe noise from idle to maximum speed for a four-cylinder engine.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an exhaust noise adjusting apparatus of the present invention, and fig. 2a to 2b are schematic sectional structural views of the exhaust noise adjusting apparatus of the present invention in operation, and as shown in fig. 1, 2a and 2b, an exhaust noise adjusting apparatus 10 includes a resonance box 11, a connection pipe 12, a movable door panel 13, and an excitation controller 14. One end of the connecting pipe 12 is communicated with the resonant cavity 101, the other end of the connecting pipe 12 is used for communicating with an exhaust pipe 20 (such as an automobile tail pipe), the movable door panel 13 is arranged in the resonant cavity 101, the driving end of the excitation controller 14 is connected with the movable door panel 13, and the excitation controller 14 can drive the movable door panel 13 to move in the resonant cavity 11 to change the frequency of the resonant cavity 101 and drive the movable door panel 13 to vibrate.

Fig. 3 is a schematic diagram of a split structure of the resonance box of the present invention, and referring to fig. 1 to 3, the resonance box 11 includes a bottom plate 111, a first side plate 112, a second side plate 113, a third side plate 114, a fourth side plate 115, and an arc-shaped cover plate 116. The first side plate 112 and the second side plate 113 are arranged in a flat and opposite manner, the third side plate 114 and the fourth side plate 115 are connected between the first side plate 112 and the second side plate 113 in a flat and opposite manner, the arc-shaped cover plate 116 is arranged above the bottom plate 111, and two ends of the first side plate 112, the second side plate 113, the third side plate 114 and the fourth side plate 115 are respectively connected with the bottom plate 111 and the arc-shaped cover plate 116. The length of the first side plate 112 perpendicular to the bottom plate 111 is less than the length of the second side plate 113 perpendicular to the bottom plate 111, one end of the arc-shaped cover plate 116 is connected to the first side plate 112, the other end of the arc-shaped cover plate 116 is bent toward the direction close to the second side plate 113, and the arc of the arc-shaped cover plate 116 is 90 °. The third side plate 114 and the fourth side plate 115 are provided with shaft holes 102 at ends close to the second side plate 113, and the shaft holes 102 are communicated with the resonant cavity 101. The bottom plate 111 is provided with a through hole 103, one end of the connecting pipe 12 is connected to the bottom plate 111, and the connecting pipe 12 is communicated with the through hole 103.

One end of the movable door panel 13 is provided with a rotating shaft 132, the rotating shaft 132 passes through the shaft hole 102 of the resonance box 11 and is connected with the excitation controller 14, and the side edges of the movable door panel 13 are respectively contacted with the third side panel 114, the fourth side panel 115 and the arc-shaped cover plate 116. Specifically, the movable door panel 13 is rectangular, the movable door panel 13 has a first side, a second side, a third side and a fourth side, the first side is parallel to and opposite to the second side, the third side is parallel to and opposite to the fourth side and is connected between the first side and the second side, the first side is in contact with the arc-shaped cover plate 116, the second side is close to the second side plate 113, the rotating shaft 132 is connected to the second side, the third side is in contact with the third side plate 114, and the fourth side is in contact with the fourth side plate 115.

The excitation controller 14 is an electromagnetic mechanical device, and the excitation controller 14 drives the movable door panel 13 to move through the rotating shaft 132, drives the movable door panel 13 to move to be parallel to the second side plate 113 and drives the movable door panel 13 to move to be parallel to the bottom plate 111, and when the movable door panel 13 is parallel to the bottom plate 111, the excitation controller 14 cannot drive the movable door panel 13 to continue to rotate in a direction close to the bottom plate 111.

Fig. 4 is a schematic diagram of the exhaust noise regulation system of the present invention, and as shown in fig. 4, the present invention also relates to an exhaust noise regulation system that includes an on-vehicle ECU30(Electronic Control Unit) and the exhaust noise regulation device 10 described above. The vehicle ECU30 is in telecommunication connection with the engine 40 and the excitation controller 14, respectively, and the vehicle ECU30 sends the sound frequency and amplitude to be compensated to the excitation controller 14, and the excitation controller 14 drives the movable door 13 to move and vibrate according to the sound frequency and amplitude.

FIG. 5 is a graph of sound pressure of tailpipe noise from idle to maximum speed for a four-cylinder engine, as shown in FIG. 5, with curve (r) representing the target sound; curve (c) represents the noise to be compensated. In order to ensure the noise quality of the tail pipe, the noise linearity needs to be improved and the target sound is close to the target sound. This noise has a large dip around 1500rpm (50Hz) and 3000rpm (100Hz) of the engine 40, and it is necessary to compensate for the tail pipe noise in this rotation speed range. As shown in FIG. 5, about 50Hz requires about 13dBA to 50dBA, and about 8dBA to 63dBA for 100 Hz. Calculating the sound pressure level of the noise to be compensated according to the following formula:

wherein SPL is sound pressure level (dBA); p is sound pressure;

the resonant cavity 101 frequency is calculated according to the following equation:

wherein the content of the first and second substances,c is the local speed of sound (m/s),

t is the gas temperature (deg.C) at the connection pipe 12 at a certain rotational speed of the engine 40; s is the cross-sectional area (m) of the connecting tube 12²) (ii) a L is the length (m) of the connecting tube 12; v is the volume (m) of the resonant cavity 101³)；

The target sound pressure output by the exhaust noise control device 10 is calculated according to the following formula:

wherein u is the average vibration velocity (m/s) of the pressure center of the movable door panel 13; r is the distance (m) from the pressure center of the movable door panel 13 to the rotating shaft 132.

Substituting the formula (3) into the formula (1) to obtain the target sound pressure level output by the exhaust noise adjusting device 10;

when the excitation controller 14 receives the frequency and amplitude of the exhaust gas noise to be compensated output by the vehicle-mounted ECU30, the excitation controller 14 drives the movable door plate 13 to move in the resonant tank 11 according to the frequency of the exhaust gas noise, so that the frequency of the resonant cavity 101 is the same as the frequency of the exhaust gas noise; then, according to the amplitude of the exhaust noise, the excitation controller 14 drives the movable door panel 13 to vibrate in the resonant tank 11, and the sound emitted from the resonant cavity 101 is transmitted to the exhaust pipe 20 through the connecting pipe 12, so that the sound compensation is completed.

The excitation controller 14 of the exhaust noise adjusting device 10 of the present invention drives the movable door panel 13 to move to change the volume of the resonant cavity 101, so that the frequency of the resonant cavity 101 can be adjusted in a matching manner according to the noise frequency to be compensated, the volume of the resonant cavity 101 is changed quickly and efficiently, and the working frequency range of the exhaust noise adjusting device 10 is enlarged. The excitation controller 14 of the exhaust noise adjusting device 10 of the present invention drives the movable door panel 13 to vibrate, so as to drive the resonant cavity 101 to resonate, which is accurate in control and timely in response. Further, the exhaust noise adjusting apparatus 10 of the present invention can compensate for sound, and when the movable door panel 13 vibrates, the exhaust noise adjusting apparatus 10 can be used as a muffler to reduce noise of a specific frequency.

The present invention also relates to an exhaust noise adjusting method using the exhaust noise adjusting apparatus 10 described above, the exhaust noise adjusting method including:

collecting the frequency and amplitude of exhaust noise; specifically, the frequency and amplitude of the noise to be compensated are calculated from the rotational speed of the engine 40 by the in-vehicle ECU30, and the frequency and amplitude of the noise are sent to the excitation controller 14;

driving the movable door plate 13 to move in the resonant box 11 by using the excitation controller 14 according to the frequency of the exhaust gas noise, so that the frequency of the resonant cavity 101 is the same as that of the exhaust gas noise;

the movable door panel 13 is driven to vibrate in the resonance box 11 by the excitation controller 14 according to the amplitude of the exhaust noise.

The present invention also relates to a vehicle including the exhaust noise control device 10, and reference is made to the prior art for the structure of the vehicle, which is not described herein again.

The present invention is not limited to the specific details of the above-described embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. The various features described in the foregoing detailed description may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.