CN109184879B - A kind of engine exhaust silencing means - Google Patents
A kind of engine exhaust silencing means Download PDFInfo
- Publication number
- CN109184879B CN109184879B CN201811378424.6A CN201811378424A CN109184879B CN 109184879 B CN109184879 B CN 109184879B CN 201811378424 A CN201811378424 A CN 201811378424A CN 109184879 B CN109184879 B CN 109184879B
- Authority
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- China
- Prior art keywords
- tail pipe
- silencer
- vehicle
- tail
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000030279 gene silencing Effects 0.000 title claims abstract description 20
- 230000003584 silencer Effects 0.000 claims abstract description 49
- 239000000725 suspension Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The present invention provides a kind of engine exhaust silencing means, are related to vehicle component technical field.Engine exhaust silencing means of the invention, comprising: preceding muffler；The after silencer being connect with preceding muffler by gas exhaust piping, it is connected on after silencer from after silencer internal stretch to external the first tail pipe, the second tail pipe and third tail pipe, wherein, third tail pipe is connected to gas exhaust piping, and is provided with through-hole being located in after silencer at position；Third tailpipe is provided with electronic valve to allow or prevent tail gas to flow out from third tailpipe；And controller, for controlling being turned on or off to allow or tail gas being prevented to flow out from the third tail pipe for electronic valve.Guarantee that vehicle can quietly drive and occur when pursuing kinaesthesis exhaust voice, can meet the needs of client is for automobile peace and quiet and movement passion simultaneously；In addition, the exhaust voice is really to issue from engine by exhaust, really experienced to people.
Description
Technical field
The present invention relates to vehicle component technical fields, more particularly to a kind of engine exhaust silencing means.
Background technique
Society is not only a kind of vehicles for automobile now, there is various demands, such as exhaust voice.It is existing
Home vehicle in the market in order to comfort be all based on peace and quiet, just only sport car has movement voice.In this demand diversification
It is current, this is the requirement for being only unable to satisfy part experience passion, but is unable to reach the case where buying sport car in economic strength
Under only muffler structure is restructured, allow its issue the original voice of engine.This method is unable to satisfy quiet comfortable requirement,
Quiet, two kinds of elements of movement can not be embodied simultaneously on a trolley.
Summary of the invention
It is an object of the present invention to provide it is a kind of quiet can not only drive, but also the engine of exhaust voice can be issued
Exhaust muffling device.
Another object of the present invention is to solve vehicle in the prior art quiet driving occur or have
The problem of being vented voice.
Particularly, the present invention provides a kind of engine exhaust silencing means, comprising:
Preceding muffler；
The after silencer being connect with the preceding muffler by gas exhaust piping is connected on the after silencer after described
Muffler internal stretch is to external the first tail pipe, the second tail pipe and third tail pipe, wherein the third tail pipe and the exhaust
Pipeline connection, and through-hole is provided at the position being located in the after silencer；The third tailpipe is provided with electronic valve
Door is to allow or prevent tail gas to flow out from the third tailpipe；With
Controller, for control the electronic valve be turned on or off to allow or prevent the tail gas from institute
State the outflow of third tail pipe.
Optionally, the controller is according to the control of the accelerator open degree of the driving mode of vehicle, vehicle revolving speed and vehicle
The open and close of electronic valve.
Optionally, the controller is configured to:
The electronic valve is controlled in non-driving mode to close,
Or be configured to control the electronic valve unlatching in driving mode,
Or be configured to when the vehicle is in driving mode, the mode according to locating for vehicle and state control the electricity
Sub- valve opening or closing；
Wherein, mode and state locating for the vehicle include the aperture of motor pattern, speed and throttle.
Optionally, the controller is configured to:
When the vehicle is in driving mode and is in non-moving pattern, controls the electronic valve and close；
When the vehicle is in driving mode and in motor pattern, and the revolving speed of the vehicle is less than preset rotation speed or institute
When stating accelerator open degree less than default aperture, controls the electronic valve and close；
When the vehicle is in driving mode and in motor pattern, and the revolving speed of the vehicle be more than or equal to it is described default
When revolving speed and the accelerator open degree are more than or equal to the default aperture, control the electronic valve and open.
Optionally, the preset rotation speed is 2000-25000rpm.
Optionally, the default aperture is 20-45%.
Optionally, the gas exhaust piping connects in the after silencer with the third tail pipe, and the through-hole is arranged
In junction；The air inlet of first tail pipe and second tail pipe is located in the after silencer, first tail pipe and
The gas outlet of second tail pipe is located at outside the muffler.
Optionally, when the electronic valve is closed, from the gas exhaust piping enter the tail gas of the after silencer from
The through hole enters the inside of the after silencer, then by the air inlet of first tail pipe and second tail pipe into
Port respectively enters first tail pipe and second tail pipe, then from the gas outlet of first tail pipe and second tail pipe
Discharge；
When the electronic valve is opened, tail gas a part of muffler is entered from the third from the gas exhaust piping
Tail pipe discharge, another part enter the inside of the after silencer from the through-hole, enter inside the after silencer
Tail gas respectively enters first tail pipe and described by the air inlet of the air inlet of first tail pipe and second tail pipe again
After second tail pipe, then it is discharged from the gas outlet of first tail pipe and second tail pipe.
Optionally, again by same pipeline after the gas convergence that the gas outlet of first tail pipe and the third tail pipe is discharged
Discharge.
Optionally, suspension hook is provided at the after silencer and the exhaust pipe with by the after silencer and institute
It states exhaust pipe and is connected to vehicle body.
Three tail pipes are arranged in the present invention after after silencer, and one of tail pipe is connected to gas exhaust piping, and in the third
Electronic valve is arranged in tailpipe, and the opening and closing of the electronic valve can guarantee that vehicle can quietly drive and chase after
Occur exhaust voice when asking kinaesthesis, can meet the needs of client is for automobile peace and quiet and movement passion simultaneously；In addition, should
Being vented voice is really to issue from engine by exhaust pipe, is really experienced to people.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter.
Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing:
Fig. 1 is the schematic diagram of engine exhaust silencing means according to an embodiment of the invention；
Fig. 2 is the partial enlargement diagram of part A in Fig. 1；
Fig. 3 is accord to a specific embodiment of that present invention when electronic control unit is opened, and tail gas is in rear silencing means
In flow schematic diagram；
Fig. 4 be accord to a specific embodiment of that present invention electronic control unit close constantly, tail gas is filled in rear noise reduction
Flow schematic diagram in setting；
Fig. 5 is the schematic block diagram that electronic valve is controlled according to the controller of a specific embodiment of this hair；
Fig. 6 is the control logic figure that electronic valve is controlled according to the controller of a specific embodiment of this hair.
Specific embodiment
Fig. 1 is the schematic diagram of engine exhaust silencing means 100 according to an embodiment of the invention.Fig. 2 is
The partial enlargement diagram of part A in Fig. 1.Engine exhaust silencing means 100 in the present embodiment may include preceding muffler
10, after silencer 20 and controller 30.Specifically, preceding muffler 10 is connect by gas exhaust piping 40 with after silencer 20.After disappear
It is connected on sound device 20 from 20 internal stretch of after silencer to external the first tail pipe 21, the second tail pipe 22 and third tail pipe 23,
Wherein, third tail pipe 23 is connected to gas exhaust piping 40, and is provided with through-hole 41 at the position being located in after silencer 20.Third
Electronic valve 50 is provided at tail pipe 23 to allow or prevent tail gas to flow out from third tail pipe 23.Controller 30 is for controlling
Electronic valve 50 is turned on or off to which permission or prevention tail gas are flowed out from third tail pipe 23.The present invention is in after silencer
Three tail pipes are set after 20, and one of tail pipe is connected to gas exhaust piping 40, and electronic valve is arranged at the third tail pipe 23
50, the opening and closing of the electronic valve 50 can guarantee that vehicle can quietly drive and go out when pursuing kinaesthesis
It is now vented voice, can meet the needs of client is for automobile peace and quiet and movement passion simultaneously.In addition, the exhaust voice is true
It is issued from engine by exhaust pipe, is really experienced to people.
Fig. 3 is accord to a specific embodiment of that present invention when electronic control unit is opened, and tail gas is in rear silencing means
In flow schematic diagram；Gas exhaust piping 40 and third tail pipe 23 as one specifically embodiment of the present invention, in the present embodiment
It is connected in after silencer 20, and through-hole 41 is located at link position.The air inlet of first tail pipe 21 and the second tail pipe 22 is located at
In after silencer 20, the gas outlet of the first tail pipe 21 and the second tail pipe 22 is located at outside muffler.Specifically as shown in Figure 3, wherein
First tail pipe 21, third tail pipe 23 are stretched out along the same side of after silencer 20, and the second tail pipe 22 is then along after silencer 20
Another side stretch out.Gas exhaust piping 40 is protruded into from the centre of after silencer 20 and is connected to afterwards with from the air inlet of third tail pipe 23
Together, and in junction through-hole 41 is set, so that tail gas can be flowed into after silencer 20 from through-hole 41.
Specifically, as shown in figure 3, entering the tail gas one of muffler from gas exhaust piping 40 when electronic valve 50 is opened
Part is discharged from third tail pipe 23, and another part enters the inside of after silencer 20 from through-hole 41, enters after silencer 20
Interior tail gas respectively enters the first tail pipe 21 and the second tail by the air inlet of the air inlet of the first tail pipe 21 and the second tail pipe 22 again
It is discharged after pipe 22 from gas outlet.The direction of arrow meaning in Fig. 3 is exactly the flow direction of tail gas.Due to electronic valve 50 at this time
It opens, therefore the tail gas for being flowed into after silencer 20 from gas exhaust piping 40 is most of flows out from third tail pipe 23, due to tail at this time
The most of noise reduction without passing through after silencer 20 of gas, the gas being discharged from third tail pipe 23 just will form exhaust voice, from
And meet the experience that some clients drive vehicle movement.
Fig. 4 be accord to a specific embodiment of that present invention electronic control unit close constantly, tail gas is filled in rear noise reduction
Flow schematic diagram in setting.When electronic valve 50 is closed, the tail gas of after silencer 20 is entered from through-hole from gas exhaust piping 40
Enter the inside of after silencer 20 at 41, is then respectively enterd by the air inlet of the air inlet of the first tail pipe 21 and the second tail pipe 22
It is discharged after first tail pipe 21 and the second tail pipe 22 from gas outlet.The tail gas flowed at this time from gas exhaust piping 40 is due to third tail pipe 23
It is obstructed, then it is all entered in after silencer 20 after noise reduction from through-hole 41, then arranged by the first tail pipe 21 and third tail pipe 23
Out.There are the first tail pipe 21 and the discharge of the second tail pipe 22 due to being now placed in all to have passed through after 20 noise reduction of after silencer,
Be discharged tail gas when just without exhaust voice, at this time vehicle be vented during the motion meeting it is quieter, meet vehicle driving pair
In quiet demand.
As a specifically embodiment, again by same after the gas convergence of the first tail pipe 21 and the gas outlet of third tail pipe 23
The discharge of one pipeline.In addition, being provided with suspension hook 60 at after silencer 20 and exhaust pipe with by after silencer 20 and exhaust pipe
Road is connected to vehicle body.The number and shape of suspension hook 60 can be designed according to actual demand.The present embodiment only wherein one
Kind embodiment, the scope of the present invention are not limited in situation described in the present embodiment.
Fig. 5 is the schematic block diagram that electronic valve 50 is controlled according to the controller 30 of a specific embodiment of this hair.Control
Device 30 processed controls the open and close of electronic valve 50 according to the accelerator open degree of the driving mode of vehicle, vehicle revolving speed and vehicle.
Specifically, controller 30 is configured to control the closing of electronic valve 50 in non-driving mode, or is configured to driving
Control electronic valve 50 when mode to open, or be configured to when vehicle be in driving mode, the mode according to locating for vehicle with
State control electronic valve 50 is turned on or off.The device of the application can actively select to control with any control model
Electronic valve 50.When vehicle is not on driving mode, such as when reversing mode or close pattern, the controller 30 control
The process that electronic valve 50 opens and closes be exactly that closes in other words, controller 30 does not control the unlatching of electronic valve 50, one
Directly it is in close state.Further include two kinds of situations and when vehicle is in driving mode, a kind of situation be electronic valve 50 always
It is in the open state, another situation is that be turned on or off according to specific demand.The specific selection can be
One select button is set at the instrument board of vehicle, selects long on-mode still to select according to specific circumstances by button to carry out
The mode of control.
Fig. 6 is the control logic figure that electronic valve 50 is controlled according to the controller 30 of a specific embodiment of this hair.
As a specifically embodiment, when vehicle is in driving mode, the mode according to locating for vehicle and state control
System is turned on or off electronic valve 50 and includes:
When vehicle is in non-moving pattern, control electronic valve 50 is closed.
When vehicle is in motor pattern, and the revolving speed of vehicle is less than preset rotation speed or accelerator open degree less than default aperture,
Electronic valve 50 is controlled to close.
When vehicle is in motor pattern, and the revolving speed of vehicle be more than or equal to preset rotation speed and accelerator open degree be more than or equal to it is default
When aperture, control electronic valve 50 is opened.
Specifically, preset rotation speed 2000-25000rpm.Such as can be 2000rpm, 2200rpm, 2500rpm etc., it is excellent
Selecting preset rotation speed is 2200rpm.And default aperture is 20-45%.Such as it can be 20%, 25%, 30% or 45%.Preferably
Default aperture is 30%.
In the present embodiment by taking preset rotation speed is 2200rpm, default aperture is 30% as an example.
As shown in fig. 6, control electronic valve is closed when vehicle is in non-moving pattern.And when vehicle is in movement
Mode, and when the revolving speed of vehicle is less than 2200rpm or accelerator open degree less than 30%, control electronic valve 50 is closed.At both
In the case of, when driving vehicle, vehicle is in quiet state.
When vehicle is in motor pattern, and the revolving speed of vehicle is more than or equal to 2200rpm and accelerator open degree is more than or equal to 30%
When, control electronic valve 50 is opened.At this point, throttle is big under motor pattern, exhaust voice is issued.
It by the above technology, can be timely responded in conjunction with the driving intention of driver, the peace and quiet in peace and quiet, when the movement
The feeling of movement voice is provided in time, to driver one perfect acoustics experience.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows
Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers all such other variations or modifications.
Claims (9)
1. a kind of engine exhaust silencing means characterized by comprising
Preceding muffler；
The after silencer being connect with the preceding muffler by gas exhaust piping is connected with the noise reduction after described on the after silencer
Device internal stretch is to external the first tail pipe, the second tail pipe and third tail pipe, wherein the third tail pipe and the gas exhaust piping
Connection, and through-hole is provided at the position being located in the after silencer；The third tailpipe be provided with electronic valve with
Allow or tail gas is prevented to flow out from the third tailpipe；With
Controller, for controlling being turned on or off to allow or preventing the tail gas from described for the electronic valve
The outflow of three tail pipes；
When the electronic valve is closed, from the gas exhaust piping enter the tail gas of the after silencer from the through hole into
Enter the inside of the after silencer, then institute is respectively enterd by the air inlet of first tail pipe and the air inlet of second tail pipe
The first tail pipe and second tail pipe are stated, then is discharged from the gas outlet of first tail pipe and second tail pipe；
When the electronic valve is opened, tail gas a part of muffler is entered from the third tail pipe from the gas exhaust piping
Discharge, another part enter the inside of the after silencer from the through-hole, enter the tail gas inside the after silencer
First tail pipe and described second are respectively enterd by the air inlet of the air inlet of first tail pipe and second tail pipe again
Tail pipe, then be discharged from the gas outlet of first tail pipe and second tail pipe.
2. engine exhaust silencing means according to claim 1, which is characterized in that
The controller controls opening for the electronic valve according to the accelerator open degree of the driving mode of vehicle, vehicle revolving speed and vehicle
It opens and closes.
3. engine exhaust silencing means according to claim 2, which is characterized in that the controller is configured to:
The electronic valve is controlled in non-driving mode to close；
The electronic valve is controlled in driving mode to open,
When the vehicle is in driving mode, the electronic valve is controlled according to mode locating for the vehicle and state and is opened
Or it closes；
Wherein, mode and state locating for the vehicle include the aperture of motor pattern, speed and throttle.
4. engine exhaust silencing means according to claim 3, which is characterized in that the controller is configured to:
When the vehicle is in driving mode and is in non-moving pattern, controls the electronic valve and close；
When the vehicle is in driving mode and in motor pattern, and the revolving speed of the vehicle is less than preset rotation speed or the oil
When door aperture is less than default aperture, controls the electronic valve and close；
When the vehicle in driving mode and be in motor pattern, and the revolving speed of the vehicle be more than or equal to the preset rotation speed and
When the accelerator open degree is more than or equal to the default aperture, controls the electronic valve and open.
5. engine exhaust silencing means according to claim 4, which is characterized in that
The preset rotation speed is 2000-25000rpm.
6. engine exhaust silencing means according to claim 4, which is characterized in that
The default aperture is 20-45%.
7. engine exhaust silencing means according to claim 1 to 6, which is characterized in that
The gas exhaust piping connects in the after silencer with the third tail pipe, and the through-hole is arranged in junction；Institute
The air inlet for stating the first tail pipe and second tail pipe is located in the after silencer, first tail pipe and second tail pipe
Gas outlet be located at outside the muffler, by the after silencer after noise reduction tail gas be discharged.
8. engine exhaust silencing means according to claim 6, which is characterized in that
It is discharged again by same pipeline after the gas convergence that the gas outlet of first tail pipe and the third tail pipe is discharged.
9. engine exhaust silencing means according to claim 1 to 6, which is characterized in that
Suspension hook is provided at the after silencer and the exhaust pipe with by the after silencer and the exhaust pipe
It is connected to vehicle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811378424.6A CN109184879B (en) | 2018-11-19 | 2018-11-19 | A kind of engine exhaust silencing means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811378424.6A CN109184879B (en) | 2018-11-19 | 2018-11-19 | A kind of engine exhaust silencing means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109184879A CN109184879A (en) | 2019-01-11 |
| CN109184879B true CN109184879B (en) | 2019-10-29 |
Family
ID=64940014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811378424.6A Active CN109184879B (en) | 2018-11-19 | 2018-11-19 | A kind of engine exhaust silencing means |
Country Status (1)
| Country | Link |
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| CN (1) | CN109184879B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111336021A (en) * | 2020-04-14 | 2020-06-26 | 无锡威孚力达催化净化器有限责任公司 | Exhaust electric control active valve and automobile exhaust sound wave control system |
| CN112228193A (en) * | 2020-10-12 | 2021-01-15 | 浙江吉利控股集团有限公司 | Exhaust sound wave control system and method for vehicle |
| CN114718697A (en) * | 2021-01-05 | 2022-07-08 | 广州汽车集团股份有限公司 | Vehicle exhaust pipe valve control method, device, system and equipment |
| CN112901762B (en) * | 2021-01-14 | 2022-05-17 | 浙江吉利控股集团有限公司 | Sound wave adjusting method and system for automatic gearbox |
| CN113847118B (en) * | 2021-09-10 | 2022-10-18 | 浙江吉利控股集团有限公司 | System and method for actively sounding exhaust silencer assembly |
| CN116181463A (en) * | 2023-01-06 | 2023-05-30 | 广州汽车集团股份有限公司 | Exhaust device and automobile |
| CN116044543B (en) * | 2023-01-17 | 2024-04-09 | 重庆长安汽车股份有限公司 | Exhaust sound quality adjusting system, method and vehicle |
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| CN1680702A (en) * | 2004-04-09 | 2005-10-12 | 五十铃自动车株式会社 | Exhaust gas throttle valve for engines |
| CN104718357A (en) * | 2012-10-09 | 2015-06-17 | 洋马株式会社 | Exhaust gas purification device |
| CN103362599A (en) * | 2013-08-01 | 2013-10-23 | 北京汽车股份有限公司 | Exhaust noise regulating system, exhaust noise regulating method and vehicle |
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| Publication number | Publication date |
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| CN109184879A (en) | 2019-01-11 |
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