CN108561246A - Diesel engine cooling EGR discharge treating systems - Google Patents
Diesel engine cooling EGR discharge treating systems Download PDFInfo
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- CN108561246A CN108561246A CN201810562083.1A CN201810562083A CN108561246A CN 108561246 A CN108561246 A CN 108561246A CN 201810562083 A CN201810562083 A CN 201810562083A CN 108561246 A CN108561246 A CN 108561246A
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- egr
- diesel engine
- cooler
- engine cooling
- discharge treating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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- 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
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- 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
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
-
- 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
- F01N13/009—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 purifying devices arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
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- 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
- F01N2230/00—Combination of silencers and other devices
- F01N2230/02—Exhaust filters
-
- 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
- F01N2230/00—Combination of silencers and other devices
- F01N2230/04—Catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a kind of diesel engine cooling EGR discharge treating systems.Diesel engine cooling EGR discharge treating systems include：Turbocharger；Non-cooled egr system, including：EGR valve, cooler for recycled exhaust gas, EGR mixer and controller；Oxidizing catalytic converter, import are connect with the outlet of the turbine of the turbocharger；Grain catcher, inlet end are connect with the outlet of the oxidizing catalytic converter；The both ends of the grain catcher are connected with differential pressure pickup；And selective catalytic reduction system operating, including：Exhaust pipe, catalytic muffler, NOxSensor adds blue tank, compressed air assisted injection system, adds cyan nozzle, aftertreatment control unit ACU and cooling liquid electromagnetic valve.The cost of parts of diesel engine cooling EGR discharge treating systems is low, oil consumption is few, transient response performance is good, durability is high, disclosure satisfy that vehicle device state 6, non-rice habitats and ship machine T4 emission level.
Description
Technical field
The present invention relates to engine art, more particularly to a kind of diesel engine cooling EGR discharge treating systems.
Background technology
State Ministry of Environmental Protection has promulgated《Automobile-used compression-ignited, gaseous fuel spark-ignition engine and automobile exhaust pollutant discharge
Limit value and measurement method (Chinese 6th stage) exposure draft》,《Opinion original text》It proposes, it is all discontented from the year two thousand twenty January 1
The new car that sufficient this standard requires must not be produced and sold, register, the new engine for being unsatisfactory for this standard requirement must not produce,
It sells and comes into operation.To meet most tight six emission regulation of state in the whole world, Chinese Automobile Industry ' and ic engine industry must reach
International most advanced level, domestic original light diesel machine platform are difficult to meet six emission regulation of state by upgrading again, re-start
Design, the exploitation of six diesel engine of energy saving and environment friendly state are imperative, and non-rice habitats T4 also must be developed quickly.
Therefore, diesel technology development faces discharge and energy saving dual-pressure, and constantly stringent regulation is diesel engine progress
Important driving force, meet at present country and Europe emission regulation, there is presently no meet vehicle device state 6, non-rice habitats and ship machine
The technology path of the emission level of T4.
Being disclosed in the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without answering
It has been the prior art well known to persons skilled in the art when being considered as recognizing or imply that the information is constituted in any form.
Invention content
The purpose of the present invention is to provide a kind of simple and reasonable diesel engine cooling EGR discharge treating systems, thus
Existing diesel cooling EGR discharge treating systems are overcome to cannot be satisfied lacking for the emission level of vehicle device state 6, non-rice habitats and ship machine T4
Point.
To achieve the above object, the present invention provides a kind of diesel engine cooling EGR discharge treating systems, including：Turbine increases
Depressor, including：Turbine and the impeller coaxial with the turbine；It is arranged between the outlet and air inlet pipe of the impeller of the turbocharger
There are charge air cooler and air throttle；Non-cooled egr system, including：EGR valve, cooler for recycled exhaust gas, EGR mixer and controller；The EGR
Exhaust steam passage and cooling passage are respectively equipped in cooler；The inlet end of the EGR valve goes out with cooler for recycled exhaust gas exhaust steam passage
Gas end connects；The outlet side of the exhaust gas entrance of the EGR mixer and EGR valve connects, the air intake of EGR mixer with start
The charge air cooler downstream of machine gas handling system connects；Oxidizing catalytic converter, import go out with the turbine of the turbocharger
Mouth connection；Grain catcher, inlet end are connect with the outlet of the oxidizing catalytic converter；The two of the grain catcher
End is connected with differential pressure pickup；And selective catalytic reduction system operating, including：Exhaust pipe, catalytic muffler, NOxSensor adds
Blue tank, compressed air assisted injection system add cyan nozzle, aftertreatment control unit ACU and cooling liquid electromagnetic valve；The exhaust pipe
It is connect with the grain catcher of diesel engine, the catalytic muffler is connected with the exhaust pipe, and the catalytic muffler includes
SCR catalyst and engine exhaust muffler, the arrival end of the catalytic muffler and outlet end are respectively arranged with temperature sensing
Device；The NOxSensor is arranged in the outlet end of the catalytic muffler；It is described add blue tank be equipped with add blue pump, sensor and
Heater；The compressed air assisted injection system adds blue tank and connect with described；The cyan nozzle that adds is arranged in the exhaust pipe
On, and connect with the metering ejector pump；The aftertreatment control unit ACU is communicated to connect with the metering ejector pump, is used for
It controls the metering pump and the compressed air electromagnetic valve works according to preset program.
Preferably, in above-mentioned technical proposal, the integral material of catalytic muffler is stainless steel, interior that SCR catalyst core is housed
Son and noise elimination pipeline.
Preferably, in above-mentioned technical proposal, catalytic muffler selects barrel type catalytic muffler, the temperature sensor difference
It is set on the cylindrical surface of arrival end and outlet end.
Preferably, in above-mentioned technical proposal, cooler for recycled exhaust gas is shell and tube cooler or strip-fin oil cooler.
Preferably, in above-mentioned technical proposal, compressed air assisted injection system includes metering ejector pump, the metered injection
Pump is integrated with metering pump and compressed air electromagnetic valve.
Preferably, in above-mentioned technical proposal, EGR valve is made of casting aluminium material.
Compared with prior art, the present invention has the advantages that：The zero of diesel engine cooling EGR discharge treating systems
Part is at low cost, oil consumption is few, transient response performance is good, durability is high, disclosure satisfy that the discharge of vehicle device state 6, non-rice habitats and ship machine T4
It is horizontal.
Description of the drawings
Fig. 1 is the structural schematic diagram of the diesel engine cooling EGR discharge treating systems of the present invention.
Fig. 2 is the NO of the diesel engine cooling EGR discharge treating systems of the present inventionXBrake specific exhaust emission figure.
Specific implementation mode
Below in conjunction with the accompanying drawings, the specific implementation mode of the present invention is described in detail, it is to be understood that the guarantor of the present invention
Shield range is not restricted by specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " comprising " or its change
It changes such as "comprising" or " including " etc. and will be understood to comprise stated element or component, and do not exclude other members
Part or other component parts.
As shown in Figure 1, according to the concrete structure of the diesel engine cooling EGR discharge treating systems of the specific embodiment of the invention
Including：Turbocharger 1, non-cooled egr system 9, oxidizing catalytic converter 2, grain catcher 3 and selective catalytic reduction
System 4.Wherein, turbocharger 1, oxidizing catalytic converter 2, grain catcher 3 and selective catalytic reduction system operating 4 be sequentially
Connection so that diesel engine cooling EGR discharge treating system cost of parts is low, oil consumption is few, transient response performance is good, durability is high,
Disclosure satisfy that vehicle device state 6, non-rice habitats and ship machine T4 emission level.
Specifically, turbocharger 1 includes：Turbine and the impeller coaxial with the turbine, it is discharged using engine
Exhaust gas inertia push turbine, turbine drives the air that coaxial wheel compresses are sent by air cleaner pipeline, makes air again
Enter cylinder after supercharging.When engine speed improves, the exhaust gas velocity of discharge is just compressed more with secondary speed also synchronous raising, impeller
More air enters cylinder, and the pressure and density of air increase more fuel oils that can burn, corresponding to increase oil mass and adjustment one
The rotating speed of lower engine, so that it may to increase the output power of engine.
Preferably, charge air cooler 5 and air throttle 6, air inlet are provided between the outlet and air inlet pipe of the impeller of turbocharger 1
Temperature increases, and not only influences volumetric efficiency in this way, is also easy to generate detonation.Therefore the equipment for wanting device to reduce intake air temperature, this
It is exactly charge air cooler 5 (intercooler), the air to entering cylinder cools down.For intercooler as radiator, use is air-cooled
But or water cooling, the heat of pressure-air are spilt by cooling in air.According to test, cooling during rolling of good performance
Device not only can enable engine compression ratio keep higher level value without will produce detonation, at the same reduce temperature also can be improved into
Atmospheric pressure further increases the effective power of engine.Air throttle 6 is used to adjust the air inflow of air inlet pipe.
Non-cooled egr system 9 includes：EGR valve, cooler for recycled exhaust gas, EGR mixer and controller.Exhaust gas is from turbocharger
Turbine before exhaust pipe in draw, send the part exhaust of engine back to cylinder again after cooling, participate in burning
Process, the main ingredient in exhaust gas is CO2, H2O, N2 etc., and the wherein higher three atomic gas CO2 and H2O of specific heat capacity is increased
The specific heat capacity of gaseous mixture in cylinder, reduces cylinder temperature before combustion mixture catches fire, also combustion process temperature is made to be declined；Together
When, it introduces after EGR that gaseous mixture oxygen content is reduced in cylinder, so that burn rate and rate of heat release is reduced, this series of influence can have
The generation of the reduction NOx emission of effect.The high pressure cold end egr system of the engine has relatively small number of connecting line, centering
Cooler and turbocharger do not pollute, and the variation of exhaust back pressure does not directly influence EGR exhaust flow, transient response
Property is good.And exhaust gas first enters back into EGR valve after cooler for recycled exhaust gas cools down, the heat resistance of EGR valve is required it is relatively low, cost compared with
It is low；EGR valve arrangement is relatively easy.Wherein, it is respectively equipped with exhaust steam passage and cooling passage in cooler for recycled exhaust gas, is sent out by introducing
Motivation coolant liquid, the exhaust gas to flowing through cooler for recycled exhaust gas cool down.Cooler for recycled exhaust gas cooling efficiency is directly affected into engine
Fresh air and exhaust gas mixing temperature, good cooling efficiency can effectively promote engine performance.Cooler for recycled exhaust gas exhaust gas is logical
Exhaust pipe connection before the inlet end in road and the turbine of turbocharger, by exhaust gas from the exhaust pipe before the turbine of turbocharger
After middle extraction, engine is entered after being cooled to suitable temperature by heat exchange method.
The inlet end of EGR valve is connect with the outlet side of cooler for recycled exhaust gas exhaust steam passage.It, can be real by adjusting the aperture of EGR valve
Now the EGR amount of engine is accurately controlled.According to the demand of different operating conditions, it is burned to provide suitable exhausted air quantity participation
Journey realizes the optimization of engine emission and performance.The EGR valve type that Yuchai mainly uses at present carries for what direct current generator drove
Lift valve, fast response time can realize two-stage by the position sensor of valve body and the air flow meter of vehicle gas handling system
Response, stability and the followability of the control of vehicle operational process EGR valve is effectively ensured in closed loop.Product possesses good durable
Property has automatically cleaning, self study and flexibility and the functions such as takes a seat.
Preferably, EGR valve 1 is made of casting aluminium material.
The outlet side of the exhaust gas entrance of EGR mixer and EGR valve connects, the air intake of EGR mixer and engine into
The charge air cooler downstream of gas system connects, and exhaust gas after being drawn in the exhaust pipe before the turbine of turbocharger and is returned to turbine and increased
After the compressor of depressor, cylinder is sent back to again with after the fresh air of charge air cooler mixes.
Preferably, cooler for recycled exhaust gas is shell and tube cooler or strip-fin oil cooler.
Controller is usually all integrated in Engine ECU, is drawn from the exhaust pipe before turbocharger for controlling, warp
Cooler for recycled exhaust gas a certain amount of exhaust gas after cooling is introduced into combustion chamber；ECU is according to the operating condition and air inlet of present engine
Demand controls the aperture of EGR valve, exhaust gas with after the fresh air of charge air cooler mixes into participating in combustion process in cylinder.EGR
It is the position closed loop based on EGR valve position sensor, two level closed-loop control that flow, which uses two level closed-loop control, level-one closed-loop control,
For the flow closed loop based on air flow meter, it can thereby realize that engine full working scope range accurately controls EGR flow.
The high pressure cold end egr system of the engine has relatively small number of connecting line, is not made to charge air cooler 5 and turbocharger 1
At pollution, the variation of exhaust back pressure does not directly influence EGR exhaust flow, and transient response is good.And exhaust gas is first through EGR valve
Cooler for recycled exhaust gas is entered back into, EGR valve is arranged in exhaust pipe side, is influenced on the low-speed performance of engine and accelerating ability small；It is not easy
Generate the failures such as coking, carbon distribution.
Oxidizing catalytic converter 2 is diesel oxidation catalyst (abbreviation DOC), and import increases with turbine
The outlet of the turbine of depressor 1 connects, and is mounted in diesel car engine exhaust system, by catalytic oxidation, can reduce
In exhaust in carbon monoxide (CO), total hydrocarbon (THC) and particulate matter (PM) after the exhaust of pollutant discharge amounts such as SOF
Manage device.For the DOC of DPF system, main function is to convert the NO in exhaust to NO2.
Grain catcher 3 is diesel particle dilter (abbreviation DPF), inlet end and oxidized form catalyzed conversion
The outlet of device 2 connects, and grain catcher 3 generally uses carrier cordierite ceramic, has the section being much mutually parallel to be on carrier
The channel of square, the adjacency channel end of DPF interlock plug-hole, and ceramic channel wall is covered with micropore, diesel exhaust gas air-flow from
The channel of bottom plug-hole enters, and the adjacency channel of front plug-hole can only be flowed to from channel wall micropore, the particulate matter in exhaust exists
It is filtered down by conduit wall under the effects that diffusional deposition, absorption, interception.The filtered model of new DPF is in-depth filtration, a part
Particle can enter the micropore inside wall surface, and DPF resistances are rapid, and filter efficiency is relatively low 60~85% or so at this time, with particle
Accumulation, wall surface celled portion are filled, and filter efficiency gradually increases, and after passage wall surface forms one layer of soot, filter efficiency increases
It is added to 90% or so, with the progressive additive of soot layer, DPF resistances gradually increase.
Preferably, the both ends of grain catcher 3 are connected with differential pressure pickup 8.
Oxidizing catalytic converter 2 and grain catcher 3 form the processing system of interaction, and DOC is coated with oxidation and urges
Agent, main function are that the NO in engine exhaust is oxidized to NO2, what NO2 can be intercepted at 250 DEG C or more with DPF
Soot in particle carries out low-temperature oxidation reaction, and reaction speed is accelerated with the raising of temperature, and 300~350 DEG C can reach most
Height, here it is the passive regeneration of DPF, DPF coatings generate NO2, and the position that DPF wall surfaces are contacted in stratum granulosum aoxidizes soot, two sides
One reacts, to strengthen passive regeneration.In addition diesel engine Part load delivery temperature reaches 400~500 DEG C, the carbon in particle
Directly with the O2 in exhaust slow oxidative reaction can occur for cigarette.In addition, the initiative regeneration principle of DPF is when carbon carrying capacity reaches in DPF
To high value, commercial car is generally 4~5g/L, and exhaust resistance increases to the oil consumption for being enough to influence engine, engine controller
Control is mounted on the fuel injector on exhaust pipe and sprays diesel oil, diesel oil resolves into HC, the oxidizing fire at DOC, the inlet DPF temperature
Degree is increased to 600~650 DEG C, and the soot that DPF is intercepted is burned rapidly removal.
If engine Nox discharges and soot emissions ratio are more than 25, in the case of temperature is suitable, passive regeneration removal
Soot and the soot of engine discharge can reach balance.It adopts a series of measures, as engine original row Nox and soot ratio are more than
100, exhaust heat management etc. strengthens passive regeneration, can reach only with passive regeneration, under public transport cycling condition, DPF carbon is carried
Amount maintains 3g/L hereinafter, resistance maintains the level for not influencing oil consumption, to which DPF is not required to initiative regeneration.
The condition (protection point) of passive regeneration：
Original row NOx/soot>25 (ranging from 20-25)；
Operating mode row's temperature>250 DEG C of accountings are wanted>60% (or 210 DEG C want 40%).
(SCR is that Selective (selectivity), Catalytic (are urged to 4 abbreviation SCR system of selective catalytic reduction system operating
Change), the english abbreviation of Reduction (reduction)), operation principle is to spray reductant into exhaust pipe, the nitrogen oxidation in exhaust
It closes object to react with reducing agent under the action of catalyst converter and be reduced into nitrogen and water, the reducing agent that SCR system uses at present is
Urea.Urea NH2CONH2Add H2NH is resolved into after O at high temperature3And CO2：
NH2CONH2+H2O-=2NH3+CO2
NH3Again with the NO and NO in exhaust2Reaction generates nitrogen and water：
NO+NO2+2NH3=2N2+3H2O
4NO+O2+4NH3=4N2+6H2O
2NO2+O2+4NH3=3N2+6H2O
The leakage of engine ammonia during entire service life in order to prevent is equipped with ammonia catalyst converter after SCR catalyst,
The NH in this catalyst converter3With O2Reaction generates nitrogen and water：
4NH3+3O2=2N2+6H2O
Wherein, the standardization aqueous solution of urea of SCR system is known as adding indigo plant.
Selective catalytic reduction system operating 4 includes：Exhaust pipe, catalytic muffler, NOxSensor, to add blue tank, compressed air auxiliary
Help that spraying system, to add cyan nozzle, aftertreatment control unit ACU, cooling liquid electromagnetic valve and corresponding pipeline (blue tube road, cold
But liquid pipeline) and harness.
Wherein, the grain catcher 3 of exhaust pipe and diesel engine connects, for receiving the exhaust gas from engine.Catalysis disappears
Sound device is connected with exhaust pipe, for restoring the nitrogen oxides in the exhaust gas and reducing the exhaust noise of the engine,
The catalytic muffler includes SCR catalyst and engine exhaust muffler, the arrival end of the catalytic muffler and outlet end
Temperature sensor there are one being respectively set.The integral material of catalytic muffler is stainless steel, interior that SCR catalyst fuse is housed and is disappeared
The lower part on sound pipe road, surface layer stainless steel material is insulating materials.It should be understood that general insulating materials in the prior art
It may be used as the insulating materials of the present invention.The average surface temperature of the catalytic muffler catalytic muffler in the process of running
Less than 200 DEG C.The arrival end of catalytic muffler is flange face interface, and outlet end is light pipe interface, catalytic muffler of the invention
Barrel type catalytic muffler, temperature sensor can be selected to be respectively arranged on the cylindrical surface of arrival end and outlet end.Add blue tank to use
In containing aqueous solution of urea, add blue tank and be equipped with and add blue pump, sensor and heater, wherein the sensor is that liquid level, liquid temperature pass
Sensor, for incuding the liquid level and temperature that add aqueous solution of urea in blue tank.Heater can utilize engine coolant
Heat changes ice.The material for adding blue tank is plastics, adds being internally provided with for blue tank and adds blue coarse filter, for preventing diameter to be more than
The bulky grain of 0.1mm enters in system.Add blue tank and be additionally provided with breather valve, for gas pressure inside and outside compensator.In addition, adding indigo plant
The bottom of tank is provided with raffinate and releases spiro pluging hole, for releasing liquid remaining in tank.
Compressed air assisted injection system 7 is connect by blue tube road with blue tank is added, and compressed air assisted injection system 7 is wrapped
Include metering ejector pump, compressed air hose and air cleaner.Wherein, metering ejector pump is integrated with metering pump, compressed air electromagnetism
Valve and heater.Metering ejector pump tool is there are four liquid/air connector and two electrical apparatus interfaces, and liquid/air connector is from top
It is followed successively by clockwise：Compressed air inlet, nozzle interface add blue entrance, add blue liquid return hole.Two electrical apparatus interfaces are：Compression is empty
Gas electromagnetism needle electrical connector and the main electrical connector of 37 needles, wherein the main electrical connector of 37 needles includes battery feed interface, igniting
Switch, air solenoid valve positive and negative anodes and J1939 is high and low and shield terminal.Metering ejector pump can control internal heater automatic
Heating, to prevent the aqueous solution of urea added in blue tank from freezing.Compressed air hose is for being passed through compressed air, to carry metering
Aqueous solution of urea afterwards is to adding cyan nozzle so that aqueous solution of urea is fully atomized ejection through adding cyan nozzle.Air cleaner is to use
Come the particle and impurity of filtering compressed air.
Add cyan nozzle to be arranged on the exhaust pipe, and connect with metering ejector pump by blue tube road, by will based on
In aqueous solution of urea and air mixture uniform atomizing and fair current penetrating exhaust pipe that amount jet pump is sent；It is not to add cyan nozzle
The injector of rust Steel material.
Aftertreatment control unit ACU is an independent electronic control unit, for controlling metering pump and compressed air electromagnetic valve
It works according to preset program, to accurately calculate the emitted dose of aqueous solution of urea, aftertreatment control unit ACU being additionally operable to ice controls
The realization of system, temperature sensor and liquid level, the signal processing of liquid temperature sensor and OBD functions.Aftertreatment control unit ACU is logical
It crosses CAN bus to connect with Engine ECU communication, passes through the running state data and two temperature sensing to the engine
The electric signal of device is calculated, and according to the various pulses demarcated in advance, in the case of in time calculating engine real work
Aqueous solution of urea emitted dose, and then by CAN bus control metering ejector pump emitted dose so that in exhaust gas
NOxIngredient is by precise restoration.
Aftertreatment control unit ACU has the function of fault self-diagnosis and OBD, when normal operation, can be heard after opening key
The very brief sound sent out when operating is pumped, at this moment motor returns to " STOP " position；When the engine is started, pump enters the " row of starting
It is empty " pattern, aqueous solution of urea is pumped by pump with maximum stream flow, then is returned to by adding blue liquid return hole and add blue tank, progress lasting in this way
Half a minute, then internal controller opens compressed air electromagnetic valve, if compressed air pressure is normal and " starting emptying " mould
When formula successfully completes, metering ejector pump will enter metered injection pattern, be controlled according to the order that aftertreatment control unit ACU is sent out
The emitted dose of aqueous solution of urea, if delivery temperature is less than 200 DEG C, aqueous solution of urea emitted dose is zero, and compressed air is persistently sprayed
It penetrates.After starting key-off, pump automatically begins to purge, and compressed air continues injection 30 seconds, is swept with pump residual in nozzle pipeline
Liquid avoids causing pipeline blockage because aqueous solution of urea crystallizes.
Cooling liquid electromagnetic valve is connected by coolant liquid pipeline and the heat exchanger for adding blue tank and adding built in blue pump, for be
System offerization ice service.Changing ice control is specially：When aftertreatment control unit ACU is by adding liquid level, the temperature sensor of blue tank
When sensing that the temperature of aqueous solution of urea is less than to a certain degree, judge that system freezes, is powered opens cooling liquid electromagnetic valve at this time.
Engine coolant after heating, which will flow to add blue tank and add indigo plant along coolant liquid pipeline, pumps built-in heat exchanger, these places
Ice will melt rapidly.Since coolant liquid pipeline and blue tube road band together, and outside is cased with insulating tube, so adding indigo plant
The ice of channel interior can also melt simultaneously.
As shown in Fig. 2, diesel engine cooling EGR discharge treating systems belong to non-cooled EGR discharge courses：Low-carbon cigarette in cylinder
Combustion technology (explosion pressure is more than 200bar)+high-pressure common rail technology (injection pressure is more than 1800bar)+high pressure ratio turbocharging
Device+non-cooled egr system (EGR rate<15%)+DOC+DPF+SCR (transformation efficiency is more than 95%).
To sum up, the cost of parts of diesel engine cooling EGR discharge treating systems is low, oil consumption is few, transient response performance is good, resistance to
Long property is high, disclosure satisfy that vehicle device state 6, non-rice habitats and ship machine T4 emission level.
The description of the aforementioned specific exemplary embodiment to the present invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining the specific principle of the present invention and its actually answering
With so that those skilled in the art can realize and utilize the present invention a variety of different exemplary implementation schemes and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (6)
1. a kind of diesel engine cooling EGR discharge treating systems, which is characterized in that including：
Turbocharger, including：Turbine and the impeller coaxial with the turbine；The outlet of the turbo-charger impeller and air inlet pipe
Between be provided with charge air cooler and air throttle；
Non-cooled egr system, including：EGR valve, cooler for recycled exhaust gas, EGR mixer and controller；In the cooler for recycled exhaust gas respectively
Equipped with exhaust steam passage and cooling passage；The inlet end of the EGR valve is connect with the outlet side of cooler for recycled exhaust gas exhaust steam passage；Institute
The outlet side of the exhaust gas entrance and EGR valve of stating EGR mixer connects, the air intake and engine aspirating system of EGR mixer
Charge air cooler downstream connection；
Oxidizing catalytic converter, import are connect with the outlet of the turbine of the turbocharger；
Grain catcher, inlet end are connect with the outlet of the oxidizing catalytic converter；The both ends of the grain catcher
It is connected with differential pressure pickup；And
Selective catalytic reduction system operating, including：Exhaust pipe, catalytic muffler, NOxSensor adds blue tank, compressed air auxiliary spray
It penetrates system, add cyan nozzle, aftertreatment control unit ACU and cooling liquid electromagnetic valve；The granule capturing of the exhaust pipe and diesel engine
Device connects, and the catalytic muffler is connected with the exhaust pipe, and the catalytic muffler includes SCR catalyst and engine row
Gas silencer, the arrival end of the catalytic muffler and outlet end are respectively arranged with temperature sensor；The NOx sensor setting
In the outlet end of the catalytic muffler；It is described add blue tank and be equipped with add blue pump, sensor and heater；The compressed air is auxiliary
Spraying system is helped to add blue pump connection with described；It is described add cyan nozzle be arranged on the exhaust pipe, and with the metering ejector pump
Connection；The aftertreatment control unit ACU is communicated to connect with the metering ejector pump, for controlling the metering pump and the pressure
Contracting air solenoid valve works according to preset program.
2. diesel engine cooling EGR discharge treating systems according to claim 1, which is characterized in that the catalytic muffler
Integral material be stainless steel, it is interior be equipped with SCR catalyst fuse and noise elimination pipeline.
3. diesel engine cooling EGR discharge treating systems according to claim 2, which is characterized in that the catalytic muffler
Barrel type catalytic muffler, the temperature sensor is selected to be respectively arranged on the cylindrical surface of arrival end and outlet end.
4. diesel engine cooling EGR discharge treating systems according to claim 1, which is characterized in that the cooler for recycled exhaust gas is
Shell and tube cooler or strip-fin oil cooler.
5. diesel engine cooling EGR discharge treating systems according to claim 1, which is characterized in that the compressed air is auxiliary
It includes metering ejector pump to help spraying system, and the metering ejector pump is integrated with metering pump and compressed air electromagnetic valve.
6. diesel engine cooling EGR discharge treating systems according to claim 1, which is characterized in that the EGR valve is using casting
Aluminum material makes.
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| CN201810562083.1A CN108561246A (en) | 2018-06-04 | 2018-06-04 | Diesel engine cooling EGR discharge treating systems |
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| CN201810562083.1A CN108561246A (en) | 2018-06-04 | 2018-06-04 | Diesel engine cooling EGR discharge treating systems |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848042A (en) * | 2019-10-12 | 2020-02-28 | 江苏大学 | Device for removing DPF particles and ash through gas-liquid multiphase injection and control method |
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Application publication date: 20180921 |