CN116044543A

CN116044543A - Exhaust sound quality adjusting system, method and vehicle

Info

Publication number: CN116044543A
Application number: CN202310075488.3A
Authority: CN
Inventors: 杨乐升; 张君夫; 杨亮; 李兵; 杜潇
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-05-02
Anticipated expiration: 2043-01-17
Also published as: CN116044543B

Abstract

Aiming at the problem that one set of exhaust muffler cannot give consideration to two acoustic modes, the invention provides an exhaust sound quality adjusting system, an exhaust sound quality adjusting method and a vehicle. The exhaust sound quality adjustment system includes: a controller ECU; a rear muffler; an exhaust pipe assembly disposed at an exhaust end of the rear muffler; a control valve disposed in the exhaust pipe assembly for adjusting a gas flow cross-sectional area of the exhaust pipe assembly; the controller ECU controls the control valve to be closed when the driving mode input by the driver is a comfort mode; and when the driving mode input by the driver is a movement mode, controlling the opening of the control valve based on the whole vehicle speed, the engine load and the engine speed, so as to realize positive correlation between the exhaust sound wave effect and the opening of the accelerator pedal.

Description

Exhaust sound quality adjusting system, method and vehicle

Technical Field

The invention relates to an exhaust system for an internal combustion engine automobile, in particular to an exhaust sound quality adjusting system and method capable of providing two exhaust sound effects of silence and movement and a vehicle.

Background

At present, an exhaust muffler of an automobile generally adopts a fixed acoustic structure, which is used for reducing the quality of exhaust sound of an engine and providing silent driving experience for the interior of the automobile, but with the increasing perfection of the driving experience requirements of users, exhaust sound waves with motion sense become the requirement items of the users.

In general, an automobile exhaust muffler is developed according to a fixed acoustic target, and an acoustic structure is used for meeting the acoustic target, such as a sports car, is developed according to the sports acoustic target, and provides dynamic exhaust sound waves, and a conventional passenger car eliminates the exhaust sound quality as much as possible, provides a comfortable in-car environment, and cannot simultaneously consider two modes of sports and comfort. In response to this need, a bimodal motion acoustic wave muffler assembly is provided in CN105986854a which allows exhaust to pass through two sets of mufflers, one set for motion and one set for comfort, by controlling an electronically controlled exhaust valve located on the tailpipe, which allows for both modes of exhaust, but this system requires two sets of exhaust mufflers, which is complex and costly.

Disclosure of Invention

Aiming at the problem that one set of exhaust muffler cannot give consideration to two acoustic modes, the invention provides an exhaust sound quality adjusting system, an exhaust sound quality adjusting method and a vehicle.

The technical scheme of the invention is as follows:

the invention provides an exhaust sound quality adjusting system, comprising:

a controller ECU;

a rear muffler;

an exhaust pipe assembly disposed at an exhaust end of the rear muffler;

a control valve disposed in the exhaust pipe assembly for adjusting a gas flow cross-sectional area of the exhaust pipe assembly;

the controller ECU controls the control valve to be closed when the driving mode input by the driver is a comfort mode; and

when the driving mode input by the driver is the movement mode, the opening of the control valve is controlled based on the speed of the whole vehicle, the load of the engine and the rotation speed of the engine, so that the exhaust sound wave effect is positively related to the opening of the accelerator pedal.

Preferably, when the vehicle speed of the whole vehicle is smaller than a preset vehicle speed and the engine load corresponding to the current engine speed is smaller than or equal to a first preset load, the controller ECU controls the control valve to be closed;

when the speed of the whole vehicle is smaller than the preset speed and the engine load corresponding to the current engine speed is larger than the first preset load, the controller ECU controls the control valve to be opened, and the opening of the control valve is positively correlated with the engine load under the same engine speed.

Preferably, when the vehicle speed of the whole vehicle is greater than or equal to a preset vehicle speed and the engine load corresponding to the current engine speed is less than or equal to a second preset load, the controller ECU controls the control valve to be closed; the second preset load is less than the first preset load;

when the speed of the whole vehicle is greater than or equal to the preset speed and the engine load corresponding to the current engine speed is greater than a second preset load, the controller ECU controls the control valve to be opened; and under the same engine load, the opening of the control valve is positively correlated with the engine speed.

Preferably, the rear muffler includes: the silencer comprises a silencer cylinder body and a multi-way pipe assembled in the silencer cylinder body;

the exhaust pipe assembly includes: a moving exhaust pipe assembly and a comfort exhaust pipe assembly disposed at an exhaust end of the muffler cylinder;

the multi-way pipe and the muffler cylinder body jointly form a silencing channel for silencing part of exhaust sound quality, and the multi-way pipe and the muffler cylinder body also jointly form a first air path communicated with the movable exhaust pipe assembly and a second air path communicated with the comfortable exhaust pipe assembly;

the control valve is arranged in the movable exhaust pipe assembly;

when the controller ECU controls the control valve to be closed, the first air path is cut off, part of exhaust single-frequency noise is muffled through the muffling channel, part of exhaust high-frequency noise is muffled through the second air path, and the residual exhaust sound quality is discharged outside the vehicle along with exhaust gas through the second air path and the comfortable exhaust pipe component;

when the controller ECU controls the control valve to be opened, part of exhaust high-frequency noise is muffled through the first air path, and the rest noise is discharged outside the vehicle along with most of exhaust gas through the first air path and the movable exhaust pipe assembly, so that an exhaust sound wave effect is formed.

Preferably, the inner cavity of the muffler cylinder body is divided into a plurality of independent cavities by a baffle plate, the muffler cylinder body is provided with an air inlet and two groups of exhaust ports, one group of exhaust ports is communicated with the movable exhaust pipe assembly, and the other group of exhaust ports is communicated with the comfortable exhaust pipe assembly;

the multi-way pipe is assembled in one target cavity of the muffler cylinder body, the multi-way pipe is provided with an inlet and two groups of outlets, and a through hole communicated with the target cavity is formed in the multi-way pipe;

the inlet of the multi-way pipe is communicated with the air inlet, a group of outlets of the multi-way pipe and a group of air outlets of the silencer cylinder body are communicated through a first perforated pipe penetrating through the partition plate, and the group of outlets of the multi-way pipe, the first perforated pipe and the group of air outlets of the silencer cylinder body jointly form the first air path;

the other group of outlets of the multi-way pipe are communicated into the rest of other cavities of the muffler cylinder body through a core pipe passing through the partition plate, and the other group of outlets of the multi-way pipe, the core pipe and the rest of other cavities of the muffler cylinder body jointly form the silencing channel;

the target cavity provided with the multi-way pipe is communicated with the other group of exhaust ports of the silencer cylinder body through a second perforated pipe, and the through holes of the multi-way pipe, the target cavity and the second perforated pipe jointly form a second gas path.

Preferably, the sports exhaust pipe assembly includes:

a conduit in communication with a set of exhaust ports of the muffler cylinder, a first exhaust pipe connected to the conduit through the control valve;

the comfort exhaust pipe assembly includes:

a second exhaust pipe communicating with another group of exhaust ports of the muffler cylinder;

when the control valve is controlled by the controller ECU to be closed, part of exhaust single-frequency noise enters into other cavities through the other group of outlets of the multi-way pipe and the core pipe to be muffled, part of exhaust high-frequency noise enters into the second perforated pipe through the through holes of the multi-way pipe to be muffled, and the residual exhaust sound quality is discharged outside the vehicle along with exhaust gas through the second perforated pipe and the second exhaust pipe;

when the control valve is controlled by the controller ECU to be opened, part of exhaust high-frequency noise enters the first perforated pipe through a group of outlets of the multi-way pipe to be muffled, and the rest of noise is discharged outside the vehicle along with most of exhaust gas through the group of outlets of the multi-way pipe, the first perforated pipe, the guide pipe, the control valve and the first exhaust tail pipe to form an exhaust sound wave effect.

Preferably, the interior of the muffler cylinder body is divided into three cavities by two partition plates;

the cavity for installing the multi-way pipe is one of three cavities positioned in the middle position;

each group of exhaust ports of the muffler cylinder body and each group of outlets of the multi-way pipe are two;

the remaining two cavities are respectively communicated with one exhaust port in each group of exhaust ports.

Preferably, the first perforated pipe and the core pipe are welded and fixed with the multi-way pipe respectively, and the second perforated pipe is clamped on the partition plate.

Preferably, the first exhaust pipe and the second exhaust pipe are connected by a reinforcing bracket.

Preferably, the exhaust sound quality adjustment system further includes:

a front muffler connected to the rear muffler through a connection pipe.

The invention provides a method for adjusting the quality of exhaust sound, which comprises the following steps:

acquiring a driving mode input by a driver;

when the driving mode is a comfort mode, a control valve arranged on an exhaust pipe assembly of the muffler is controlled to be closed;

when the driving mode is a sport mode, the opening of a control valve arranged on an exhaust pipe assembly of the muffler is controlled based on the speed of the whole vehicle, the load of the engine and the rotating speed of the engine, so that the gas flow cross section of the exhaust pipe assembly is controlled, and the exhaust sound wave effect is positively related to the opening of an accelerator pedal.

Preferably, when the vehicle speed of the whole vehicle is smaller than a preset vehicle speed and the engine load corresponding to the current engine speed is smaller than or equal to a first preset load, the control valve is controlled to be closed;

and when the speed of the whole vehicle is smaller than the preset speed and the engine load corresponding to the current engine speed is larger than the first preset load, controlling the control valve to be opened, and under the same engine speed, the opening of the control valve is positively correlated with the engine load.

Preferably, when the vehicle speed of the whole vehicle is greater than or equal to a preset vehicle speed and the engine load corresponding to the current engine speed is less than or equal to a second preset load, the control valve is controlled to be closed; the second preset load is less than the first preset load;

when the speed of the whole vehicle is greater than or equal to the preset speed and the engine load corresponding to the current engine speed is greater than a second preset load, the control valve is controlled to be opened; and under the same engine load, the opening of the control valve is positively correlated with the engine speed.

The invention also provides a vehicle comprising the exhaust sound quality adjusting system.

The beneficial effects of the invention are as follows:

only one rear muffler is needed, and the exhaust sound quality adjusting system integrates the two modes of the motion mode and the comfort mode by controlling the opening of a control valve in an exhaust pipe assembly at the exhaust side of the rear muffler; in addition, in the sport mode, a more accurate control strategy is provided, so that a driver can be given stronger sport feeling and driving pleasure, and the sound and power performance are better matched.

Drawings

Fig. 1 is a control flow chart of an exhaust sound quality adjusting system in the present embodiment;

fig. 2 is a schematic diagram showing the exhaust sound quality trend of the exhaust sound quality adjusting system in the comfort mode according to the present embodiment;

fig. 3 is a schematic diagram of the exhaust sound quality trend of the exhaust sound quality adjusting system in the present embodiment in the movement mode;

fig. 4 is a block diagram of an exhaust sound quality adjustment system in the present embodiment;

fig. 5 is a structural view of the rear muffler in the present embodiment;

fig. 6 is a structural view of the left exhaust pipe assembly in the present embodiment;

fig. 7 is a structural view of the right exhaust pipe assembly in the present embodiment;

FIG. 8 is a sound target graph based on boost versus power performance matching;

FIG. 9 is a graph of sound control results based on lift versus power performance matching.

Detailed Description

Further advantages and effects of the present invention will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

Referring to fig. 4, there is provided an exhaust sound quality adjusting system in which only one rear muffler 3 is required, and the exhaust sound quality adjusting system integrates exhaust sound quality adjustment of two modes of a sport mode and a comfort mode by controlling the opening degree of

control valves

45,55 in an exhaust pipe assembly on an exhaust side of the rear muffler 3; in addition, in the sport mode, a more accurate control strategy is provided, so that a driver can be given stronger sport feeling and driving pleasure, and the sound and power performance are better matched.

In this embodiment, the movement mode and the comfort mode are integrated in the whole vehicle driving mode in advance, and the movement mode is a mode for representing that the user expects strong exhaust sound waves; comfort mode is a mode that characterizes the user's desire for a weak or even no quality of exhaust sound. The sport mode and the comfort mode are switched by the user independently, such as through the input adjustment of a vehicle-mounted display or a vehicle-mounted button, the adjustment of the sport mode and the comfort mode is not controlled by the speed of the whole vehicle, and the user can switch the two driving modes under any speed condition.

As shown in fig. 4, the exhaust sound quality adjustment system in the present embodiment specifically includes: a controller ECU6;

a rear muffler 3;

an exhaust pipe assembly provided at an exhaust end of the rear muffler 3;

a

control valve

45,55 disposed in the exhaust pipe assembly, the

control valve

45,55 for adjusting a gas flow cross-sectional area of the exhaust pipe assembly;

when the controller ECU6 obtains that the driving mode input by the driver is the comfort mode, it controls the

control valves

45 and 55 to be closed, and adjusts the exhaust sound quality; and

when the driving mode input by the driver is the sport mode, the opening of the

control valves

45 and 55 is controlled based on the vehicle speed, the engine load and the engine speed, so that the exhaust sound wave effect is positively related to the opening of the accelerator pedal.

The accelerator pedal opening may be converted to an engine load and an engine speed, among others, and the conversion means are well known to those skilled in the art.

The exhaust pipe assemblies may be one group, two groups, three groups or more groups, and the exhaust pipe assemblies illustrated in the embodiment are arranged in two groups, and the two groups of exhaust pipe assemblies are symmetrically arranged. When the exhaust pipe components are in one group or three groups, the distribution mode of the exhaust pipe components in the groups can be selectively designed by a person skilled in the art in combination with the restrictions of modeling, hardware arrangement space and the like.

In this embodiment, the mechanism for realizing the change of exhaust sound waves along with the driving mode is as follows: when the driving mode input by the driver is the comfort mode, the controller ECU6 controls the

control valves

45 and 55 to be closed, so that the exhaust sound quality cannot be discharged outside the vehicle through the loop where the

control valves

45 and 55 are located, but is mostly muffled in the rear muffler 3, so that the finally discharged exhaust sound quality is small in sound, and the passenger demands are met. When the driving mode input by the driver is a sport mode, the controller ECU6 controls the

control valves

45 and 55 to be closed or opened according to the change of the vehicle speed, the change of the engine speed and the change of the engine load, and when the control valves are closed, the exhaust sound quality cannot be discharged outside the vehicle through a loop where the

control valves

45 and 55 are positioned, but is mostly muffled in the rear muffler 3, so that the finally discharged exhaust sound quality is small in sound, and the passenger requirement is met; or when the

control valves

45 and 55 are opened, the exhaust sound quality is exhausted outside the vehicle through the loop where the

control valves

45 and 55 are positioned, so that the exhaust sound finally exhausted is big, and the big sound requirement of passengers is met.

The

control valves

45,55 are conventional electrically controlled valves, and can be implemented by using related valves in the prior art.

Of course, the above-described system in the present embodiment should also have a pre-muffler 1 connected to a post-muffler 3 through a connection pipe 2.

Specifically, the system relies on two types of exhaust gas paths, namely a comfort mode and a movement mode, integrated in the multi-way pipe 34 in the rear muffler 3, and realizes the switching between the movement mode and the comfort mode by controlling the valve opening of the

control valves

45 and 55 positioned in the movement type exhaust gas paths.

Correspondingly, as shown in fig. 2, 3, 5, 6 and 7, the rear muffler 3 in the present embodiment specifically includes: a muffler cylinder, a multi-way pipe 34 assembled in the muffler cylinder;

the exhaust pipe assembly includes: a sports exhaust pipe assembly and a comfort exhaust pipe assembly disposed at the exhaust end of the muffler cylinder 34;

the multi-way pipe 34 and the muffler cylinder body jointly form a silencing channel for silencing part of exhaust sound quality, and the multi-way pipe 34 and the muffler cylinder body jointly form a first air path communicated with the movable exhaust pipe assembly and a second air path communicated with the comfortable exhaust pipe assembly;

control valves

45,55 are provided in the moving exhaust pipe assembly;

when the

control valves

45 and 55 are closed, the controller ECU6 cuts off the first air path, part of exhaust single-frequency noise is muffled through the muffling channel, part of exhaust high-frequency noise is muffled through the second air path, and the residual exhaust sound quality is discharged outside the vehicle along with exhaust gas through the second air path and the comfortable exhaust pipe component;

when the controller ECU6 controls the

control valves

45 and 55 to be opened, part of the exhaust high-frequency noise is muffled through the first air path, and the rest of the noise is discharged outside the vehicle along with most of the exhaust gas through the first air path and the movable exhaust pipe assembly, so that an exhaust sound wave effect is formed.

The muffler cylinder body is composed of a shell 31, a left end cover 32 and a right end cover 33, wherein the shell 31, the left end cover 32 and the right end cover 33 are formed by adopting special fixture equipment for buckling.

Specifically, when the

control valves

45 and 55 are closed, the exhaust gas and noise in the first gas path cannot be discharged outwards through the movable exhaust pipe assembly, but only can be discharged through the second gas path and the comfortable exhaust pipe assembly, most of the noise is muffled through the muffling channel, so that the noise finally discharged through the comfortable exhaust pipe assembly is small, and the effect of discharging the noise required by a driver is achieved; when the

control valves

45 and 55 are opened, most of exhaust is discharged outwards through the movable exhaust pipe assembly, part of high-frequency noise in the exhaust sound quality is subjected to noise elimination through the first air path, more dynamic order sound (such as high-frequency noise and low-frequency noise of air flow are required to be reduced in an acoustic structure in the first air path) in original noise of the engine is regulated, and meanwhile, the high-harmonic frequency orders (such as 4, 5, 6, 7, 8 steps and the like) of the engine are directionally strengthened, so that the engine exhaust sound wave effect is formed.

In order to achieve the above technical effects, the inner cavity of the muffler barrel in the present embodiment is divided into a plurality of independent cavities by the partition plate 39, and the muffler barrel is provided with an air inlet and two groups of air outlets, one group of air outlets is communicated with the sports exhaust pipe assembly, and the other group of air outlets is communicated with the comfort exhaust pipe assembly; a multi-way pipe 34 is assembled in one of the target cavities of the muffler cylinder body, the multi-way pipe 34 is provided with an inlet and two groups of outlets, and a through hole communicated with the target cavity is formed in the multi-way pipe; the inlet of the multi-way pipe 34 is communicated with the air inlet, a group of outlets of the multi-way pipe 34 and a group of air outlets of the silencer cylinder are communicated through a first perforated pipe 35 penetrating through the partition plate, and a group of outlets of the multi-way pipe 34, the first perforated pipe 35 and a group of air outlets of the silencer cylinder jointly form a first air path; the other group of outlets of the multi-way pipe 35 are communicated into the remaining other cavities of the muffler cylinder through the core pipe passing through the partition plate 39, and the other group of outlets of the multi-way pipe 34, the core pipe and the remaining other cavities of the muffler cylinder jointly form a silencing channel; the target cavity equipped with the multi-way pipe 34 is communicated with the other group of exhaust ports of the muffler cylinder body through a second perforated pipe 36, and the through holes of the multi-way pipe 34, the target cavity and the second perforated pipe 36 form a second air path together.

Correspondingly, as shown in fig. 4, 6 and 7, the sports exhaust pipe assembly includes: a conduit communicating with a set of exhaust ports of the muffler cylinder, a first exhaust pipe connected to the conduit through control valves 45, 55; the comfort exhaust pipe assembly includes: a second exhaust pipe communicating with another group of exhaust ports of the muffler cylinder; when the control valves 45 and 55 are controlled by the controller ECU6 to be closed, part of exhaust single-frequency noise enters into other cavities for silencing through the other group of outlets and the core pipe of the multi-way pipe, part of exhaust high-frequency noise enters into the second perforated pipe 36 for silencing through the through holes of the multi-way pipe 34, and the residual exhaust sound quality is discharged outside the vehicle along with exhaust gas through the second perforated pipe 36 and the second exhaust pipe; when the control valves 45 and 55 are opened under the control of the controller ECU6, part of exhaust high-frequency noise enters the first perforated pipe 35 through a group of outlets of the multi-way pipe 34 to be muffled, and the rest of noise is discharged outside the vehicle along with most of exhaust gas through a group of outlets of the multi-way pipe 34, the first perforated pipe 35, the guide pipe, the control valves 45 and 55 and the first exhaust tail pipe to form an exhaust sound wave effect.

Specifically, where there is only one set of the sports exhaust and comfort exhaust assemblies, the above-described partition is 1, and there is only one set of exhaust ports and one set of outlets. When there are 3 or more groups of the sports exhaust pipe assembly and the comfort exhaust pipe assembly, the number of the partition plates 39 is 1 less than the number of the exhaust pipe assemblies, the number of the exhaust ports and the outlets is consistent with the number of the exhaust pipe assemblies, and the specific arrangement form needs to be designed adaptively according to the actual requirements.

In the present embodiment, as shown in fig. 5, the exhaust pipe assemblies are 2 groups. Correspondingly, the interior of the muffler cylinder body is divided into three cavities by two partition plates; the cavity for installing the multi-way pipe is one of three cavities positioned in the middle position; each group of exhaust ports of the muffler cylinder body and each group of outlets of the multi-way pipe are two; the remaining two cavities are respectively communicated with one exhaust port in each group of exhaust ports.

In this embodiment, as shown in fig. 5, three cavities, namely, a first cavity, a second cavity and a third cavity, are assembled in the second cavity at the middle position. The manifold 34 is in this embodiment embodied as a five-way pipe with four outlets, two towards the first cavity side and two towards the third cavity side; one outlet towards one side of the first cavity is communicated with one exhaust port on one side of the first cavity after passing through the partition plate 39 and the first cavity through the first perforated pipe 35, and the other outlet towards one side of the first cavity is communicated into the first cavity after passing through the partition plate 39 through the second core pipe 38; one outlet towards one side of the third cavity is communicated with one exhaust port on one side of the third cavity after passing through the partition plate 39 and the third cavity through the first perforated pipe 35, and the other outlet towards one side of the third cavity is communicated into the third cavity after passing through the partition plate 39 through the first core pipe 37; meanwhile, the other exhaust port on the first cavity side extends into the first cavity through the second perforated pipe 36, and the other exhaust port on the third cavity side extends into the third cavity through the second perforated pipe 36. Correspondingly, the exhaust pipe assemblies in the embodiment are 2 groups, namely the left exhaust pipe assembly 4 in fig. 6 and the right exhaust pipe assembly 5 in fig. 7, and the structural designs of the left exhaust pipe assembly 4 and the right exhaust pipe assembly 5 are completely consistent, but the arrangement positions are opposite.

The second core tube 38 and the first core tube 37 are throats of the sound-eliminating cavity aiming at specific frequency between 0 and 100Hz, and mainly reduce the subjective feeling clunk of the engine source.

The first perforated pipe 35, the first core pipe 37, the second core pipe 38 and the multi-way pipe 34 are connected through a welding process; the second perforated tube 36 is connected to the partition 39 by a snap-lock process to form a core assembly; finally, the plastic is pressed into the shell 31 by special tooling equipment.

The left exhaust pipe assembly 4 comprises one of the above-described sports exhaust pipe assembly and comfort exhaust pipe assembly, the sports exhaust pipe assembly of the left exhaust pipe assembly 4 comprises a pipe 44, a control valve 45, a pipe 46 and a decorative cover connected with the pipe 44 in fig. 6, the comfort exhaust pipe assembly of the left exhaust pipe assembly 4 comprises a pipe 41 and a decorative cover 43 in fig. 6, the pipe 46 and the pipe 41 are connected through a reinforcing bracket 42, and each part of the sports exhaust pipe assembly and the comfort exhaust pipe assembly is formed by welding. The tube 46 communicates with a corresponding exhaust port of the first perforated tube 35 passing through the third chamber, and the tube 41 communicates with a corresponding exhaust port of the second perforated tube 36 passing through the third chamber.

Similarly, the right exhaust pipe assembly 5 includes one of the above-described sports exhaust pipe assembly and comfort exhaust pipe assembly, the sports exhaust pipe assembly of the right exhaust pipe assembly 5 includes a pipe 54, a control valve 55, a pipe 56 and a decorative cover connected to the pipe 54 in fig. 7, the comfort exhaust pipe assembly of the left exhaust pipe assembly 5 includes a pipe 51 and a decorative cover 53 in fig. 7, the pipe 56 and the pipe 51 are connected by a reinforcing bracket 52, and the respective components of the sports exhaust pipe assembly and the comfort exhaust pipe assembly are formed by welding. The tube 56 communicates with a corresponding exhaust port of the first perforated tube 35 passing through the first cavity, and the tube 51 communicates with a corresponding exhaust port of the second perforated tube 36 passing through the first cavity.

The above-described pipe 46 and pipe 56 correspond to the above-described duct, the pipe 44 and pipe 54 correspond to the above-described first exhaust pipe, and the pipe 41 and pipe 51 correspond to the above-described second exhaust pipe.

The system disclosed by the invention uses one muffler and one set of acoustic structure, is compatible with two exhaust sound effects of sports type and comfort type, and reduces the number of the mufflers of an engine exhaust system and the weight of the exhaust system.

The embodiment can realize the exhaust sound quality adjustment by using the system. Specifically, referring to fig. 1, when the driver selects the driving mode in the vehicle, and when the comfort mode is selected, the mode switch command reaches the controller ECU6, and after the controller ECU6 determines that the comfort mode command is received, the controller ECU6 sends a

control valve

45,55 closing command pre-stored in the controller ECU to the

control valve

45,55 through the LIN line, at this time, the

control valve

45,55 located in the sports exhaust pipe assembly is closed, the

control valve

45,55 is closed, the exhaust gas does not flow through the sports exhaust pipe assembly, all the exhaust gas flows through the second gas path and the comfort exhaust pipe assembly, and finally, the exhaust sound quality is reduced along with the exhaust gas, the exhaust gas sound quality is transmitted out of the exhaust pipe through the acoustic structure of the second gas path, and at this time, the exhaust sound quality is expressed as a comfortable exhaust sound effect.

Referring to fig. 1, when a driver selects a driving mode in the vehicle, and when a sport mode is selected, a mode switch command arrives at the controller ECU6, after the controller ECU6 determines that the sport mode command is received, the controller ECU6 issues a

control valve

45,55 opening adjustment command through a LIN line, when the

control valves

45,55 in the sport exhaust pipe assembly are opened, the

control valves

45,55 are opened, exhaust gas does not flow through the second gas path, all the exhaust gas flows through the first gas path corresponding to the sport mode, and finally, the exhaust sound quality is discharged outside the vehicle, and is transmitted out of the sport exhaust pipe assembly through the acoustic structure of the first gas path, and at this time, the sport exhaust sound quality is transmitted, and the controller ECU6 controls the opening of the

control valves

45,55 through the LIN line according to the difference of the vehicle speed, the engine load, and the control opening of the accelerator pedal by the driver (the correspondence relationship between the vehicle speed, the engine load, the engine speed and the opening angle of the

control valves

45,55 in the sport mode is written in the controller ECU 6).

Specifically, for the above-mentioned comfort mode application scenario, as shown in fig. 3, after the vehicle is started, the driver turns off the motion mode switch (hard switch or soft switch) in the vehicle, the instruction of turning off the motion mode is transmitted to the controller ECU6, the controller ECU6 switches to the comfort mode according to the driving requirement, the controller ECU6 communicates via LIN, and according to the action instruction stored in the controller ECU6 in advance, the

control valves

45 and 55 on the left and right exhaust pipe assemblies 4 and 5 issue a closing instruction, and the

control valves

45 and 55 execute the instruction to perform the control valve closing action. After the control valve 45 and the control valve 55 are closed, the exhaust flow resistance of the first air path (the multi-way pipe 34+the first perforated pipe 35) tends to infinity, at this time, the engine exhaust gas and the exhaust sound quality cannot flow through the air path, the engine exhaust gas and the exhaust sound quality can flow to the second air path (the multi-way pipe 34+the second core pipe 38+the second perforated pipe 36), part of the single-frequency noise can enter an expansion cavity formed by the first core pipe 37 and a right cavity of the muffler to be muffled, part of the high-frequency noise is muffled through the second perforated pipe 36, the rest noise after the muffling is completed is discharged outside the vehicle along with the exhaust gas through the second exhaust pipe 41, the decorative cover 43, the pipe 51 and the decorative cover 53, at this time, the exhaust sound quality passes through the comfort mode exhaust air path, and the noise satisfies the noise requirement of the comfort mode after the multiple muffling.

For the application scenario of the movement mode, as shown in the system architecture of fig. 2, after the vehicle is started, the driver turns on the movement mode switch (hard switch or soft switch) in the vehicle, the instruction of turning on the movement mode is transmitted to the controller ECU6, the controller ECU6 switches to the movement mode according to the driving requirement, the controller ECU6 communicates through LIN, and according to the action instruction pre-stored in the controller ECU6, the

control valves

45 and 55 on the left exhaust pipe assembly 4 and the right exhaust pipe assembly 5 issue an opening adjustment instruction, the

control valves

45 and 55 execute the instruction, and the opening or closing actions of the

control valves

45 and 55 are performed. After the control valve 45 and the control valve 55 are opened, the first air passage (the multi-way pipe 34 and the first perforated pipe 35) is opened, and the second air passage (the multi-way pipe 34 and the second core pipe 38 and the second perforated pipe 36) is short-circuited at the moment because the exhaust resistance of the first air passage is extremely low, and most of the exhaust gas is discharged outside the vehicle after passing through the first air passage (the multi-way pipe 34 and the first perforated pipe 35) through the pipe 46, the control valve 45, the pipe 44, the decorative cover 43, the pipe 56, the control valve 55, the pipe 54 and the decorative cover 53; the noise of the high frequency noise in the exhaust sound quality is partially eliminated through the first perforated pipe 35, because the acoustic structure in the first air path is used for adjusting the more dynamic order noise (such as the high frequency noise and the low frequency noise of the air flow are required to be reduced), and simultaneously, the high harmonic frequency order (such as 4, 5, 6, 7, 8 steps and the like) of the engine is directionally enhanced to form the exhaust sound effect of the engine.

Specifically, when the vehicle speed is smaller than the predetermined vehicle speed v, the opening degrees of the control valve 45 and the control valve 55 are set as shown in table 1. Specifically, when the vehicle speed of the whole vehicle is less than the predetermined vehicle speed and the engine load corresponding to the current engine speed is less than or equal to the first preset load, the

control valves

45,55 are controlled to be closed; when the vehicle speed of the whole vehicle is smaller than the preset vehicle speed and the engine load corresponding to the current engine speed is larger than the first preset load, the

control valves

45 and 55 are controlled to be opened, and at the same engine speed, the opening degree of the

control valves

45 and 55 is positively related to the engine load.

TABLE 1

When the vehicle speed is greater than or equal to the predetermined vehicle speed v, the opening degree control of the

control valves

45,55 is performed according to the correspondence relationship between the engine load, the engine speed, and the opening angle of the

control valves

45,55, which are preset in table 2. Specifically, when the vehicle speed of the whole vehicle is greater than or equal to the predetermined vehicle speed and the engine load corresponding to the current engine speed is less than or equal to the second preset load, the

control valve

45,55 is controlled to be closed, and the second preset load is smaller than the first preset load; when the vehicle speed of the whole vehicle is greater than or equal to the preset vehicle speed and the engine load corresponding to the current engine speed is greater than a second preset load, the

control valves

45 and 55 are controlled to be opened; and the opening of the

control valves

45,55 is positively correlated with the engine speed at the same engine load. When the power demand of a driver is less, the angle of the accelerator pedal which is stepped on is smaller, the engine load and the rotating speed (wherein the engine rotating speed and the engine rotating speed are positively correlated) are lower, the opening degree of a valve plate of the control valve 45 and the control valve 55 is changed from 0 degrees to a4 degrees (wherein a2 degrees is less than a3 degrees and less than a4 degrees), the quality of exhaust sound of the propagation number is less, and the exhaust sound wave is weaker; when the power demand of the driver is more, the angle of the accelerator pedal which is stepped on is larger, the engine load and the rotating speed are higher, the opening degree of the valve plates of the control valve 45 and the control valve 55 is changed from a4 degrees to 90 degrees (a 4 degrees is less than a5 degrees), the quality of the transmitted exhaust sound is more, and the exhaust sound wave is stronger. Because the acoustic structure of the first air path is less, the exhaust resistance is low, and the dynamic property of the engine is improved (other opening angle calibration can be performed on the opening angle of the control valve according to a specific NVH performance target).

TABLE 2

The control strategy proposed by the invention is based on the result of testing and evaluating the newly proposed more comprehensive dynamic performance information (engine speed, engine torque) and sound under the same coordinate platform, as shown in fig. 9. As shown by the test results in the graph, the matching degree of sound and power performance is not high before control is not added, for example, the low rotation speed is below 2000rpm, the engine torque is not large, but the sound pressure level and the sound change rate are large; the high torque sound level above 4000rpm at high rotational speed is substantially unchanged. In order to solve the defect, the invention firstly obtains the upper and lower limit indexes of the sound pressure level based on the matching degree of the power performance improvement based on the big data media and the internal user driving evaluation, and then adjusts the opening degree of the calibrated valve, so that the sound pressure level is regulated and controlled in the range, and the ignition angle of the engine is moderately adjusted at a high rotating speed. Through the control mode, the correlation between the operation of the accelerator pedal and the exhaust sound wave effect of the driver can be achieved, the driver can be given stronger movement feeling and driving pleasure, the sound and the dynamic performance are better matched, and the linearity of the sound is better, as shown in fig. 9. Compared with the existing dual-mode exhaust muffler control system on the market, the system integrates two sets of acoustic structures through one muffler cylinder body, and controls two exhaust paths through two control valves to achieve two modes, so that the system has a simpler system structure, lighter weight and lower cost.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims

1. An exhaust sound quality adjustment system, comprising:

a controller ECU (6);

a rear muffler (3);

an exhaust pipe assembly provided at an exhaust end of the rear muffler (3);

a control valve (45, 55) disposed in the exhaust pipe assembly, the control valve (45, 55) being for adjusting a gas flow cross-sectional area of the exhaust pipe assembly;

the controller ECU (6) controls the control valves (45, 55) to be closed when the driving mode input by the driver is acquired as a comfort mode; and

when the driving mode input by the driver is a sport mode, the opening degree of the control valve (45, 55) is controlled based on the whole vehicle speed, the engine load and the engine speed, so that the exhaust sound wave effect is positively related to the opening degree of the accelerator pedal.

2. The exhaust gas sound quality adjustment system according to claim 1, characterized in that,

when the speed of the whole vehicle is smaller than the preset speed and the engine load corresponding to the current engine speed is smaller than or equal to a first preset load, the controller ECU (6) controls the control valves (45, 55) to be closed;

when the speed of the whole vehicle is smaller than the preset speed and the engine load corresponding to the current engine speed is larger than the first preset load, the controller ECU (6) controls the control valves (45, 55) to be opened, and the opening of the control valves (45, 55) is positively correlated with the engine load under the same engine speed.

3. The exhaust gas sound quality adjustment system according to claim 2, characterized in that,

when the speed of the whole vehicle is greater than or equal to a preset speed and the engine load corresponding to the current engine speed is less than or equal to a second preset load, the controller ECU (6) controls the control valves (45, 55) to be closed; the second preset load is less than the first preset load;

when the speed of the whole vehicle is greater than or equal to a preset speed and the engine load corresponding to the current engine speed is greater than a second preset load, the controller ECU (6) controls the control valves (45, 55) to be opened; and the opening of the control valve (45, 55) is positively correlated with the engine speed at the same engine load.

4. The exhaust gas sound quality adjustment system according to claim 1, characterized in that,

the rear muffler (3) includes: a muffler cylinder, a multi-way pipe (34) assembled in the muffler cylinder;

the multi-way pipe (34) and the muffler cylinder body jointly form a silencing channel for silencing part of exhaust sound quality, and the multi-way pipe (34) and the muffler cylinder body also jointly form a first air channel communicated with the movable exhaust pipe assembly and a second air channel communicated with the comfortable exhaust pipe assembly;

the control valve (44, 45) is disposed in the moving exhaust pipe assembly;

when the controller ECU (6) controls the control valves (44, 45) to be closed, the first gas path is cut off, part of exhaust single-frequency noise is muffled through the muffling channel, part of exhaust high-frequency noise is muffled through the second gas path, and the residual exhaust sound quality is discharged outside the vehicle along with exhaust gas through the second gas path and the comfortable exhaust pipe assembly;

when the controller ECU (6) controls the control valves (44, 45) to be opened, part of exhaust high-frequency noise is muffled through the first air path, and the rest noise is discharged to the outside of the vehicle along with most of exhaust gas through the first air path and the movable exhaust pipe assembly, so that an exhaust sound wave effect is formed.

5. The exhaust sound quality adjustment system according to claim 4, characterized in that the inner cavity of the muffler cylinder is divided into independent multiple cavities by a partition (39), and the muffler cylinder is provided with an air inlet and two groups of exhaust ports, one group of exhaust ports being communicated with the sport exhaust pipe assembly, and the other group of exhaust ports being communicated with the comfort exhaust pipe assembly;

the multi-way pipe (34) is assembled in one target cavity of the muffler cylinder body, the multi-way pipe (34) is provided with an inlet and two groups of outlets, and a through hole (341) communicated with the target cavity is formed in the multi-way pipe (34);

the inlet of the multi-way pipe (34) is communicated with the air inlet, a group of outlets of the multi-way pipe (34) and a group of air outlets of the silencer cylinder body are communicated through a first perforated pipe (35) penetrating through the partition plate (39), and the group of outlets of the multi-way pipe (34), the first perforated pipe (35) and the group of air outlets of the silencer cylinder body jointly form the first air path;

the other group of outlets of the multi-way pipe (34) are communicated into the rest of other cavities of the muffler cylinder body through a core pipe passing through the partition plate (39), and the other group of outlets of the multi-way pipe (34), the core pipe and the rest of other cavities of the muffler cylinder body jointly form the silencing channel;

the target cavity provided with the multi-way pipe (34) and the other group of exhaust ports of the muffler cylinder body are communicated through a second perforated pipe (36), and the through holes (341) of the multi-way pipe (34), the target cavity and the second perforated pipe (36) form the second air path together.

6. The exhaust sound quality adjustment system of claim 5, wherein the sport exhaust pipe assembly comprises:

a conduit in communication with a set of exhaust ports of the muffler cylinder, a first exhaust pipe connected to the conduit through the control valve (44, 45);

the comfort exhaust pipe assembly includes:

when the control valves (44, 45) are closed under the control of the controller ECU (6), part of exhaust single-frequency noise enters into other cavities through the other group of outlets of the multi-way pipe (34) and the core pipe to be muffled, part of exhaust high-frequency noise enters into the second perforated pipe (36) through the through holes (341) of the multi-way pipe (34) to be muffled, and the residual exhaust sound quality is discharged outside the vehicle along with exhaust gas through the second perforated pipe (36) and the second exhaust pipe;

when the control valves (44, 45) are controlled to be opened by the controller ECU (6), part of exhaust high-frequency noise enters the first perforated pipe (35) through a group of outlets of the multi-way pipe (34) to be muffled, and the rest of noise is discharged to the outside of the vehicle along with most of exhaust gas through the group of outlets of the multi-way pipe (34), the first perforated pipe (35), the guide pipe, the control valves (44, 45) and the first exhaust tail pipe to form an exhaust sound wave effect.

7. The exhaust gas sound quality adjustment system according to claim 6, characterized in that,

the interior of the muffler cylinder body is divided into three cavities by two partition plates (39);

the cavity for installing the multi-way pipe (34) is one of three cavities positioned in the middle position;

each group of exhaust ports of the muffler cylinder body and each group of outlets of the multi-way pipe (34) are two;

8. The exhaust sound quality adjustment system according to claim 5, characterized in that the first perforated pipe (35) and the core pipe are welded and fixed with the multi-way pipe (34), respectively, and the second perforated pipe (36) is clamped on the partition plate (39).

9. The exhaust sound quality adjustment system of claim 6, wherein the first exhaust pipe and the second exhaust pipe are connected by a reinforcing bracket.

10. The exhaust sound quality adjustment system according to claim 1, characterized in that the exhaust sound quality adjustment system further comprises:

-a pre-muffler (1) connected to said post-muffler (3) by means of a connecting pipe (2).

11. A method for adjusting the quality of exhaust gas sound, comprising:

acquiring a driving mode input by a driver;

when the driving mode is a comfort mode, a control valve (45, 55) arranged on an exhaust pipe assembly of the muffler is controlled to be closed;

when the driving mode is a sport mode, the opening of the control valve (45, 55) arranged on the exhaust pipe assembly of the muffler is controlled based on the speed of the whole vehicle, the load of the engine and the rotating speed of the engine, so that the gas flow sectional area of the exhaust pipe assembly is controlled, and the positive correlation between the exhaust sound wave effect and the opening of the accelerator pedal is realized.

12. The method for adjusting the quality of exhaust gas according to claim 11,

when the speed of the whole vehicle is smaller than the preset speed and the engine load corresponding to the current engine speed is smaller than or equal to a first preset load, the control valve (45, 55) is controlled to be closed;

when the speed of the whole vehicle is smaller than the preset speed and the engine load corresponding to the current engine speed is larger than the first preset load, the control valves (45, 55) are controlled to be opened, and the opening of the control valves (45, 55) is positively correlated with the engine load under the same engine speed.

13. The exhaust sound quality adjustment method according to claim 11 or 12, characterized in that,

when the speed of the whole vehicle is greater than or equal to a preset speed and the engine load corresponding to the current engine speed is less than or equal to a second preset load, the control valve (45, 55) is controlled to be closed; the second preset load is less than the first preset load;

when the speed of the whole vehicle is greater than or equal to the preset speed and the engine load corresponding to the current engine speed is greater than a second preset load, the control valve (45, 55) is controlled to be opened; and the opening of the control valve (45, 55) is positively correlated with the engine speed at the same engine load.

14. A vehicle characterized by comprising the exhaust sound quality adjustment system according to any one of claims 1 to 10.