CN104405482B - Exhaust treatment system - Google Patents
Exhaust treatment system Download PDFInfo
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- CN104405482B CN104405482B CN201410541551.9A CN201410541551A CN104405482B CN 104405482 B CN104405482 B CN 104405482B CN 201410541551 A CN201410541551 A CN 201410541551A CN 104405482 B CN104405482 B CN 104405482B
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- exhaust
- treatment system
- compressor
- valve
- controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an exhaust treatment system. Air is leaded into an exhaust pipe through an air compressor and an ejector, is mixed with waste gas in the exhaust pipe, and flows to a catalytic converter. The exhaust treatment system can adjust the temperature of the waste gas in the exhaust pipe and the excess air coefficient to satisfy optimal chemical reaction conditions of the catalytic converter; meanwhile, when an engine is started, a high-concentration fuel generates a large quantity of HC and CO; and the HC and CO are mixed with the leaded-in air in the catalytic converter for burning to heat the catalytic converter, so that the temperature of the catalytic converter quickly rises, the burning rising time of the catalytic converter is shortened, the working time is ahead of time, and the problem of injurant increment caused by the starting of the engine is reduced.
Description
Technical field
The invention belongs to vehicle exhaust system, particularly a kind of exhaust-gas treatment system.
Background technology
Automobile with internal combustion engine as power has been developed more than 100 years, the development and progress of human society is generated huge
Earth effect.Simultaneously as the discharge of vehicle exhaust, also make the mankind living environment suffered it is serious destroy, can solve
The tail gas pollution of internal combustion engine has become the prerequisite whether industry survives.
Petrol engine produces carbon monoxide (CO), carbon dioxide (CO in mixed combustion2) and water (H2O), oxygen and
Nitrogen generates at high temperature nitrogen oxides (NOx).Additionally, fuel oil can not possibly all burn, therefore also include in emission hydrocarbon
Compound (HC).CO, NOx and HC are main pollutants, can cause serious harm to human body and environment.Excess air coefficient pair
The generation of above pollutant affects larger, overrich and it is excessively dilute burning will all deteriorated, cause its content to raise.Generally, gasoline is sent out
The optimal excess air coefficient of motivation is 1, but in order to meet some special operating conditions, such as idling, cold start-up and maximum
Power output, actual excess air coefficient can float 1 or so, such as reach 0.8 or lower.
In order to process and purifying the pernicious gas of gasoline exhaust, catalysis is introduced in the exhaust-gas treatment system of engine
Converter.In catalytic converter, emission is finally completed HC, CO, NOx and is reduced to CO by a series of conversion2、N2
With the chemical process of the innocuous gas such as water vapour.Catalytic converter does not possess catalytic capability under normal temperature, and its catalyst must be heated
To uniform temperature just have oxidation or reduce ability, the initiation temperature of usual catalytic converter at 250-350 DEG C, normal work
Make temperature typically at 350-700 DEG C.Catalytic converter can discharge heat when working because of oxidation reaction, promote its temperature to enter one
Step is raised, and when temperature is more than 850-1000 DEG C, its internally coated catalyst is likely to come off, carrier fragmentation.Catalyzed conversion
The reaction condition of device is not only influenced by temperature, and is affected by the excess air coefficient in waste gas.Overrich excessively dilute all can
Course of reaction is affected, causes catalytic efficiency to reduce.
When engine just starts, its temperature is normal temperature level to catalytic converter, less than 250-350 DEG C of initiation temperature, is urged
Change converter then not yet to start working, with the growth of engine operating duration, the temperature of catalytic converter also gradually rises, when
When reaching its initiation temperature, catalytic reaction just starts.This section of catalytic converter start-up operation is arrived after the engine started
In time, combustion product is unprocessed to be just directly discharged to air, and pernicious gas also together flows out, and danger is caused to environment
Evil.Because prior art does not carry out catalytic converter any auxiliary heating, so that its light-off time is longer, cause to send out
The discharge capacity of motivation startup stage pernicious gas is big.
In engine idle, due to the requirement of engine running characteristics, low excess air coefficient makes catalytic converter
Efficiency is reduced, and the emission level for ultimately resulting in whole machine is deteriorated.
When the temperature in combustion chamber is raised, the EGT of engine exhaust system can be raised accordingly naturally, when this
When temperature exceedes the optimal reaction temperature of catalytic converter, it is necessary to ignition temperature is controlled, to realize its normal work
Condition, it is ensured that the service life of rational reaction efficiency and maintenance catalyst converter.Modern main petrol engine uses premix
Combination burning pattern, rational excess air coefficient is in 0.8～1.2 scope, and burning mixture concentration range is less, it is difficult to dilute
Combustion.When ignition temperature is too high, it is difficult to reach effectively reduce reaction temperature by improving excess air coefficient.Generally using drop
The method of low combustion temperature is to reduce excess air coefficient, it means that the quality of fuel fraction in combustion mixture increases,
Concentration is raised, and using the fuel of high concentration combustion reaction is deteriorated, and reduces efficiency of combustion, finally reduces ignition temperature.However, reaching
The purpose reduced to ignition temperature is, to increase specific fuel consumption as cost, to the economic index of engine negative shadow to be produced
Ring, meanwhile, after the combustion mixture burning of high concentration, increase the concentration of harmful substance in combustion product, when waste gas flows through catalysis
During converter so as to which load increases, waste gas flowing velocity is larger, there is the incomplete situation of conversion.Then, in prior art bar
Under part, there is the predicament attended to one thing and lose sight of another in the control strategy of temperature.
The content of the invention
The technical problem to be solved is to provide one kind and outside air is incorporated into blast pipe Jing after supercharging, is shortened
Catalytic converter light-off time, the exhaust-gas treatment system for guaranteeing catalytic converter maintenance optimum response efficiency.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is：
A kind of exhaust-gas treatment system, including：
The compressor being connected by pipeline and injector；
Blast pipe, it is arranged on the injector；
Controller, itself and the mechatronics of calming the anger.
Preferably, it is provided with pressure stabilizing cavity on the pipeline between the compressor and the injector.
Preferably, be provided with the first valve on the pipeline between the compressor and the pressure stabilizing cavity, first valve with
The controller electrical connection.
Preferably, be provided with the second valve on the pipeline between the pressure stabilizing cavity and the injector, second valve with
The controller electrical connection.
Preferably, the first pressure sensor electrically connected with the controller is provided with the pressure stabilizing cavity.
Preferably, be provided with the first valve on the pipeline between the compressor and the injector, first valve with
The controller electrical connection.
Preferably, exhaust-gas treatment system, also includes：
Air intake diffuser pipe, its rear end is connected with the compressor.
Preferably, the front elevational sectional of the air intake diffuser pipe is less than rear end section.
Preferably, the sensor electrically connected with the controller is provided with the blast pipe, the sensor includes temperature
Sensor, second pressure sensor and oxygen-containing quantity sensor.
Exhaust-gas treatment system of the present invention introduces air into blast pipe by compressor and injector, and then waste gas is flowed to again
Catalytic converter.The temperature of waste gas in gas exhaust piping and excess air coefficient can be entered by the exhaust-gas treatment system of the present invention
Row is adjusted, the chemical reaction condition optimal to meet catalytic converter；Meanwhile, in engine start, the fuel life of high concentration
Into substantial amounts of HC and CO, with the air mixed combustion for introducing, heatable catalytic converter so as to which temperature is quick in catalytic converter
Raise, shorten catalytic converter light-off time, the work ahead time, reduce because of the hazardous emission caused by engine start
The problem of increase.
Description of the drawings
Fig. 1 is the connection figure of exhaust-gas treatment system provided in an embodiment of the present invention.
Reference is in Fig. 1：1 air intake diffuser pipe, 2 compressors, 3 first valves, 4 pressure stabilizing cavities, 5 second valves, 6 are started
Machine, 7 blast pipes, 8 injectors, 9 catalytic converters, 11 controllers, 12 first control circuits, 13 the 3rd control circuits, 14 second
Control circuit, 18 second detection circuits, 19 first detection circuits, 21 first pressure sensors, 22 sensors.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
Embodiment one：
As shown in figure 1, a kind of exhaust-gas treatment system, including：Compressor 2, injector 8, blast pipe 7 and controller 11.Its
Middle compressor 2 is connected with injector 8 by pipeline, and blast pipe 7 is arranged on injector 8, and controller 11 passes through the first control line
Road 12 electrically connects with compressor 2.Compressor 2 is electric drive compressor, and controller 11 may be selected PLC, single-chip microcomputer or other logics
Controller or control circuit.
When using, blast pipe 7 is connected respectively by pipeline with engine 6 and catalytic converter 9, and compressor 2 is by environment
Air compression be advanced to injector 8, the air after supercharging is sprayed into blast pipe 7, this air and the row of engine 6 by injector 8
The tail gas for going out flows to catalytic converter 9 and carries out redox process after the mixing of blast pipe 7.The rotating speed of compressor 2 is in certain model
Enclose interior variable, to realize the regulation to pressure ratio, controller 11 regulates and controls to compressor 2, adjust the sky of the compression propulsion of compressor 2
Throughput.
Preferably, compressor 2 is connected by pipeline with the rear end of air intake diffuser pipe 1, and air intake diffuser pipe 1 is arranged on before car load
Portion, communicates with external environment.In running car, the air in environment is flowed into certain speed from the front end of air intake diffuser pipe 1,
It is preferred that the front elevational sectional of air intake diffuser pipe 1 is less than rear end section, air stream expands wherein, pressure rise, and speed is reduced.To sky
The purpose of air-flow reduction of speed boosting flows into the air stream in compressor 2 primarily to match with the compressor 2 in the system
Speed will not be excessive, and the working speed of compressor can be with relatively low.Air is pushed away after the progressive supercharging another to air stream of compressor 2
Enter injector 8.
It is further preferred that being provided with the sensing that the first detection circuit 19 is electrically connected with controller 11 in blast pipe 7
Device 22, the sensor 22 includes temperature sensor, second pressure sensor and oxygen-containing quantity sensor.Sensor 22 is by the shape of waste gas
The detection circuit 19 of state parameter Jing first is fed back in controller 11, and controller 11 is calculated needed for blast pipe 7 according to exhaust gas parameters
The air mass flow wanted, then adjust compressor 2, the final air mass flow for obtaining system requirements according to the uninterrupted.
It is similar with the above course of work, when just starting when the air-fuel ratio in waste gas is abnormal or in engine, can be by
Fresh air is added in waste gas.The waste gas generated in engine 6 reaches blast pipe 7, and sensor 22 is dense by the oxygen of waste gas
The degree detection circuits 19 of Jing first feed back to controller 11, and controller 11 calculates what is wanted needed for blast pipe 7 according to the concentration
Air mass flow.This strand of air-flow is flowed from compressor 2 to injector 8, and the size of flow is affected by the rotating speed of compressor 2.
Embodiment two
A kind of exhaust-gas treatment system, is improved on the basis of embodiment one, no longer by compressor 2 and injector 8
It is direct-connected, but install the first valve 3 additional between compressor 2 and injector 8, the first valve 3 is by pipeline and compressor 2 and injection
Device 8 is connected, and first valve 3 is also electrically connected by control circuit with controller 11, and other structures are identical with embodiment one.This
The advantage of design is that controller 11 can adjust the flow of air by the aperture of the first valve of direct regulation and control 3.First valve
3 for whole system, increased a controllable dot, so as to improve the controllability and stability of exhaust-gas treatment system.
Embodiment three
As shown in figure 1, a kind of exhaust-gas treatment system, is improved on the basis of embodiment one, no longer by compressor 2
It is direct-connected with injector 8, but install pressure stabilizing cavity 4 additional between compressor 2 and injector 8, pressure stabilizing cavity 4 by pipeline respectively with calm the anger
Machine 2 is connected with injector 8, and other structures are identical with embodiment one.The effect of pressure stabilizing cavity 4 is air-flow, systems stabilisation pressure
Power.Preferably, first pressure sensor 21 is provided with pressure stabilizing cavity 4, the first pressure sensor 21 is by the second detection circuit
18 electrically connect with controller 11.Pressure value in pressure stabilizing cavity 4 obtains and feeds back to controller 11 by first pressure sensor 21,
Controller 11 is contrasted according to the pressure value of pressure stabilizing cavity 4 with standard value, according to comparing result output control signal, Jing control circuits 12
Compressor 2 is transferred to, changes the working speed of compressor 2, finally make the pressure in pressure stabilizing cavity 4 keep constant.
Example IV
As shown in figure 1, a kind of exhaust-gas treatment system, is improved on the basis of embodiment three, no longer by compressor 2
It is direct-connected with pressure stabilizing cavity 4, but install the first valve 3 additional between compressor 2 and pressure stabilizing cavity 4, the first valve 3 by pipeline respectively with
Compressor 2 is connected with pressure stabilizing cavity 4, and first valve 3 is also electrically connected by the 3rd control circuit 13 with controller 11, other structures
It is identical with embodiment three.The advantage of this design is that controller 11 can be adjusted by the aperture of the first valve of direct regulation and control 3
The flow of air.First valve 3 increased a controllable dot, so as to improve exhaust-gas treatment system for whole system
Controllability and stability.
Embodiment five
As shown in figure 1, a kind of exhaust-gas treatment system, is improved on the basis of embodiment three, no longer by pressure stabilizing cavity 4
It is direct-connected with injector 8, but install the second valve 5 additional between pressure stabilizing cavity 4 and injector 8, the second valve 5 by pipeline respectively with
Pressure stabilizing cavity 4 is connected with injector 8, and second valve 5 is also electrically connected by the second control circuit 14 with controller 11, other structures
It is identical with embodiment three.The advantage of this design is that controller 11 can be adjusted by the aperture of the second valve of direct regulation and control 5
The flow of air.Second valve 5 increased a controllable dot, so as to improve exhaust-gas treatment system for whole system
Controllability and stability.
Embodiment six
As shown in figure 1, a kind of exhaust-gas treatment system, is improved on the basis of embodiment five, no longer by pressure stabilizing cavity 4
It is direct-connected with compressor 2, but install the first valve 3 additional between pressure stabilizing cavity 4 and compressor 2, the first valve 3 by pipeline respectively with
Pressure stabilizing cavity 4 is connected with compressor 2, and first valve 3 is also electrically connected by the 3rd control circuit 13 with controller 11, other structures
It is identical with example IV.Controller 11 adjusts air mass flow by controlling compressor 2, the second valve 5 and the first valve 3, enters
One step improves the controllability and stability of exhaust-gas treatment system.
In above-mentioned each embodiment, air is flowed into by automotive front end, and source of the gas is external environment, with engine aspirating system
It is separate.
Exhaust-gas treatment system introduces air into blast pipe by compressor 2 and injector 8, and then waste gas flows to again catalysis
Converter 9.On startup, in order to ensure startability, using little air-fuel ratio, fuel concentration is higher for engine, burns insufficient,
In the waste gas for generating, the concentration of HC and CO is big.Waste gas and appropriate air are mixed before catalytic converter 9, makes to give up
HC and CO oxidizing fires in gas, using reaction liberated heat heatable catalytic converter so as to which temperature is quickly raised, and reaches it
Initiation temperature.So, the light-off time for just making catalytic converter 9 shortens, and the working time shifts to an earlier date, and solves because of engine start institute
The problem that the hazardous emission for causing increases.In engine idle, fresh air can adjust the air-fuel ratio coefficient in waste gas,
Make the air-fuel ratio match with the optimum value of catalytic converter, keep the optimum response efficiency of catalytic converter 9.Even if normal
Engine behavior, it is also possible to appropriate regulation is carried out to the air-fuel ratio in waste gas.
Still further aspect, the exhaust-gas treatment system can cool down the off-gas flows for flowing through catalytic converter 9, and control catalysis turns
Change the temperature of device 9.Because fuel concentration is in the zone of reasonableness of engine combustion, burning is not caused to deteriorate, reaction efficiency is reduced, heat
Cycle efficieny such as degenerates at the consequence.Meanwhile, quality of fuel fraction is increased without concentration of harmful substance liter in caused combustion product
Height, will not also increase the live load of catalytic converter 9.
In sum, present disclosure is not limited in above-described embodiment, and those skilled in the art can basis
The guiding theory of the present invention proposes easily other embodiment, and these embodiments are included within the scope of the present invention.
Claims (8)
1. a kind of exhaust-gas treatment system, it is characterised in that include：
The compressor (2) being connected by pipeline and injector (8)；
Blast pipe (7), it is arranged on the injector (8)；
Controller (11), it is electrically connected with the compressor (2)；
The exhaust-gas treatment system also includes：
Air intake diffuser pipe (1), it is anterior installed in car load, communicate with external environment, so as to the air in running car, in environment
Flowed into from the front end of the air intake diffuser pipe (1) with certain speed, its rear end is connected with the compressor (2), the air intake expands
The front elevational sectional of pressure pipe (1) is less than rear end section.
2. exhaust-gas treatment system according to claim 1, it is characterised in that：The compressor (2) and the injector (8)
Between pipeline on be provided with pressure stabilizing cavity (4).
3. exhaust-gas treatment system according to claim 2, it is characterised in that：The compressor (2) and the pressure stabilizing cavity (4)
Between pipeline on be provided with the first valve (3), first valve (3) is electrically connected with the controller (11).
4. exhaust-gas treatment system according to claim 3, it is characterised in that：The pressure stabilizing cavity (4) and the injector (8)
Between pipeline on be provided with the second valve (5), second valve (5) is electrically connected with the controller (11).
5. exhaust-gas treatment system according to claim 2, it is characterised in that：The pressure stabilizing cavity (4) and the injector (8)
Between pipeline on be provided with the second valve (5), second valve (5) is electrically connected with the controller (11).
6. exhaust-gas treatment system according to claim 2, it is characterised in that：Be provided with the pressure stabilizing cavity (4) with it is described
The first pressure sensor (21) of controller (11) electrical connection.
7. exhaust-gas treatment system according to claim 1, it is characterised in that：The compressor (2) and the injector (8)
Between pipeline on be provided with the first valve (3), first valve (3) is electrically connected with the controller (11).
8. exhaust-gas treatment system according to claim 1, it is characterised in that：Be provided with the blast pipe (7) with it is described
The sensor (22) of controller (11) electrical connection, the sensor (22) includes temperature sensor, second pressure sensor and oxygen-containing
Quantity sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410541551.9A CN104405482B (en) | 2014-10-14 | 2014-10-14 | Exhaust treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410541551.9A CN104405482B (en) | 2014-10-14 | 2014-10-14 | Exhaust treatment system |
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| Publication Number | Publication Date |
|---|---|
| CN104405482A CN104405482A (en) | 2015-03-11 |
| CN104405482B true CN104405482B (en) | 2017-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410541551.9A Active CN104405482B (en) | 2014-10-14 | 2014-10-14 | Exhaust treatment system |
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| Country | Link |
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| CN (1) | CN104405482B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863668B (en) * | 2015-04-11 | 2017-07-04 | 成都陵川特种工业有限责任公司 | Exhaust gas cleaner |
| CN106640398B (en) * | 2016-12-26 | 2019-07-12 | 天津大学 | A kind of device and control method shortening triple effect catalytic converter light-off time |
| TWI789578B (en) * | 2020-04-10 | 2023-01-11 | 睿普工程股份有限公司 | Exhaust emission recovery and voltage stabilization control system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5459998A (en) * | 1992-03-11 | 1995-10-24 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for introducing fresh air into exhaust pipe of internal combustion engine for purification of exhaust gas |
| FR2840643A1 (en) * | 2002-06-06 | 2003-12-12 | Renault Sa | Equipment for supercharged engine facilitating treatment of exhaust gas comprises diversion pipe with valve connected to air admission pipe between compressor and engine and to exhaust pipe between engine and gas treatment equipment |
| CN103383169A (en) * | 2013-08-12 | 2013-11-06 | 南京协众汽车空调集团有限公司 | Air conditioning system using engine waste heat |
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| JPS64312A (en) * | 1987-06-22 | 1989-01-05 | Yanmar Diesel Engine Co Ltd | Spark-ignition engine with catalizer |
| US5519992A (en) * | 1993-03-16 | 1996-05-28 | Mitsubishi Denki Kabushiki Kaisha | Exhaust gas purification system for internal combustion engine, and apparatus and method for controlling the same |
| JP3344040B2 (en) * | 1993-11-25 | 2002-11-11 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| DE19643027A1 (en) * | 1996-10-01 | 1998-04-09 | Fev Motorentech Gmbh & Co Kg | Exhaust gas purification system for internal combustion engine |
| DE10062377B4 (en) * | 2000-12-14 | 2005-10-20 | Siemens Ag | Apparatus and method for heating an exhaust catalyst for a supercharged internal combustion engine |
| JP3855818B2 (en) * | 2002-03-28 | 2006-12-13 | 日産自動車株式会社 | Diesel engine exhaust purification system |
| JP4844467B2 (en) * | 2007-05-07 | 2011-12-28 | 日産自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| WO2012124531A1 (en) * | 2011-03-15 | 2012-09-20 | 日野自動車株式会社 | Exhaust gas purification device |
| CN203559965U (en) * | 2013-12-10 | 2014-04-23 | 安徽江淮汽车股份有限公司 | Three-way catalytic converter |
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2014
- 2014-10-14 CN CN201410541551.9A patent/CN104405482B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5459998A (en) * | 1992-03-11 | 1995-10-24 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for introducing fresh air into exhaust pipe of internal combustion engine for purification of exhaust gas |
| FR2840643A1 (en) * | 2002-06-06 | 2003-12-12 | Renault Sa | Equipment for supercharged engine facilitating treatment of exhaust gas comprises diversion pipe with valve connected to air admission pipe between compressor and engine and to exhaust pipe between engine and gas treatment equipment |
| CN103383169A (en) * | 2013-08-12 | 2013-11-06 | 南京协众汽车空调集团有限公司 | Air conditioning system using engine waste heat |
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| CN104405482A (en) | 2015-03-11 |
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