CN112879169A - Method and system for controlling air intake and exhaust treatment of internal combustion engine - Google Patents

Method and system for controlling air intake and exhaust treatment of internal combustion engine Download PDF

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Publication number
CN112879169A
CN112879169A CN202110257619.0A CN202110257619A CN112879169A CN 112879169 A CN112879169 A CN 112879169A CN 202110257619 A CN202110257619 A CN 202110257619A CN 112879169 A CN112879169 A CN 112879169A
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internal combustion
combustion engine
exhaust
air inlet
control valve
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CN112879169B (en
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李伟
黄永仲
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Guangxi Yuchai Marine and Genset Power Co Ltd
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Guangxi Yuchai Machinery Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/12—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with non-fuel substances or with anti-knock agents, e.g. with anti-knock fuel
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/02—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to oxygen-fed engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • 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
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/10—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone
    • F02M25/12—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone the apparatus having means for generating such gases
    • 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
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • 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
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10255—Arrangements of valves; Multi-way valves
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/10—Carbon or carbon oxides
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/12—Hydrocarbons
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • Y02T10/12—Improving ICE efficiencies

Abstract

The invention discloses a method for controlling intake and exhaust treatment of an internal combustion engine, which relates to the technical field of internal combustion engines and solves the technical problem that tail gas of the internal combustion engine contains a large amount of harmful gases and soot particulate pollutants, and the method comprises the following steps: when the internal combustion engine is started, uniformly mixing oxygen and inert gas according to a first set proportion, and inputting the mixture into an air inlet pipe of the internal combustion engine so as to allow the internal combustion engine to run; and when the internal combustion engine is successfully started, the inert gas is closed, part of tail gas of the internal combustion engine is obtained, and the oxygen and the tail gas are uniformly mixed according to a second set proportion and then are input into the air inlet pipe for the internal combustion engine to run. The invention also discloses an air inlet and exhaust treatment system of the internal combustion engine. In the starting stage of the internal combustion engine, the inert gas and oxygen mixed mode is adopted as the air inlet of the internal combustion engine, so that the internal combustion engine can be easily started, the generation of hydrocarbon HC in the starting process is reduced, and the exhaust gas recirculation is carried out when the internal combustion engine continuously runs after being started, so that the harmful gas and soot particle pollutants can be further reduced.

Description

Method and system for controlling air intake and exhaust treatment of internal combustion engine
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to an air intake and exhaust treatment control method and system for an internal combustion engine.
Background
As is well known, in an internal combustion engine using diesel oil, gasoline and other petrochemical fuel as fuel, air needs to be sucked into a cylinder, and carbon dioxide, nitrogen oxides NOx, hydrocarbons HC, soot particles, carbon dioxide CO and the like are generated after work is done by combustion2And water. Meanwhile, among the components of air, oxygen O 221% of nitrogen gas N2The percentage of the oxygen in the air sucked by the internal combustion engine is up to 78 percent, whether the internal combustion engine is a natural air suction type internal combustion engine or a turbocharged internal combustion engine, whether the internal combustion engine is in a plain area or a plateau area, and oxygen O in the air sucked by the internal combustion engine2With nitrogen N2The ratio of (a) is almost constant. It can be seen that oxygen O is helpful for combustion2The content ratio is always at a low level and during combustion, because of the large amount of N2The existence of the nitrogen oxide NOx can cause the internal combustion engine taking diesel oil as fuel to emit a large amount of nitrogen oxide NOx, and the oxygen O in the combustion process can be caused by the reduction of the air-fuel ratio during the heavy load or rapid acceleration process of the internal combustion engine because a large amount of fuel is injected into a cylinder to perform combustion work2The defects are caused, so that more soot particles are generated, and the environment is seriously influenced.
Whether the automobile internal combustion engine market, the non-road internal combustion engine market or the ship and power generation internal combustion engine market, the increasingly stricter emission regulations have been applied to the internal combustion engine body and the air inletHigher demands are made on the treatment and exhaust aftertreatment. In the field of internal combustion engines, exhaust gas aftertreatment is mainly carried out by oxidation reaction of carbon monoxide CO, HC hydrocarbon and nitrogen oxide NOx through DOC (diesel oxidation catalyst) to generate carbon dioxide CO2Water H2O and NO2The DPF (soot trap) may trap and intercept particulate components in the exhaust gas by the wall-flow DPF, thereby achieving the purification of the particulates. To reduce DPF system drag, the DPF system must burn off, i.e., regenerate, the soot from the trapped particulates. And SCR (injecting urea solution NH)3Selective catalytic reduction device) to NO produced by a previous oxidation reaction2Carrying out catalytic reaction to generate N2And H2And O. Because DOC (diesel catalytic oxidation) uses rare noble metal as catalyst, DPF (carbon smoke particle catcher) adopts ceramic filter carrier with complex process and limited service life, SCR needs to consume a large amount of NH3The urea solution has high accumulated use cost, statistics shows that the purchase and maintenance cost of the internal combustion engine emission post-treatment device accounts for more than 30 percent of the purchase and maintenance cost of the whole engine, even higher cost, and a large amount of waste post-treatment devices are required to be recovered and treated due to faults or service life termination, so that the urea solution is not beneficial to the long-term and large-scale popularization and use of the post-treatment devices in the long term.
The main reason for this is the use of petrochemical oils, in particular the intake air required for combustion is taken from the air, which contains a high proportion of nitrogen N2Therefore, the exhaust gas discharged from the internal combustion engine contains a large amount of pollutants such as harmful gases like nitrogen oxides NOx and soot particles.
Disclosure of Invention
The present invention is directed to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide a method for controlling intake and exhaust gas treatment of an internal combustion engine, which can reduce the emission of harmful gases and soot pollutants.
The invention also aims to provide an intake and exhaust gas treatment system of the internal combustion engine, which can reduce the emission of harmful gases and soot particulate pollutants.
In order to achieve the above object, the present invention provides an intake and exhaust treatment control method for an internal combustion engine, comprising:
when the internal combustion engine is started, uniformly mixing oxygen and inert gas according to a first set proportion, and then inputting the mixture into an air inlet pipe of the internal combustion engine so as to enable the internal combustion engine to run;
and when the internal combustion engine is successfully started, closing the inert gas, obtaining partial tail gas of the internal combustion engine, uniformly mixing the oxygen and the tail gas according to a second set proportion, and inputting the mixture into the air inlet pipe for the internal combustion engine to run.
As a further improvement, the obtained tail gas is the tail gas after post-treatment.
Further, the post-treatment is specifically that the tail gas is sequentially treated by a diesel oxidation catalyst, a soot particle catcher and a selective catalytic reduction device.
Further, the first set ratio is 3.7:1 to 1:1 of inert gas oxygen.
Furthermore, the second set proportion is that the ratio of the tail gas to the oxygen is 1: 1-7: 1.
In order to achieve the second purpose, the invention provides an intake and exhaust treatment system of an internal combustion engine, which comprises an oxygen generator, an oxygen storage tank, an inert gas storage tank, a mixer, an intake conduit connected with an intake pipe in the internal combustion engine, and an exhaust conduit connected with an exhaust pipe in the internal combustion engine, wherein the mixer is arranged at one end of the intake conduit close to the intake pipe, a first control valve is arranged at one end of the intake conduit far away from the intake pipe, the inert gas storage tank is connected with the intake conduit through a second control valve, the oxygen storage tank is connected with the intake conduit through a third control valve, an oxygen output end of the oxygen generator is connected with the intake conduit through a fourth control valve, a fifth control valve is arranged on the exhaust conduit, and the fifth control valve is connected with an input end of the mixer through an exhaust pipe;
when the internal combustion engine is started, controlling the opening degrees of the second control valve, the third control valve and the fourth control valve to provide an appropriate amount of gas for the internal combustion engine according to the method;
and when the internal combustion engine is started successfully, controlling the opening degrees of the third control valve, the fourth control valve and the fifth control valve to provide the proper amount of gas for the internal combustion engine according to the method.
As a further improvement, the oxygen output end of the oxygen generator is connected with the oxygen storage tank through an air supply pipe, and an air pump is arranged on the air supply pipe.
Furthermore, an exhaust guide pipe between the exhaust pipe and the fifth control valve is provided with a post-processing mechanism.
Further, the aftertreatment mechanism includes at least one of a diesel oxidation catalyst, a soot trap, and a selective catalytic reduction device.
Further, a first intercooler is arranged on an exhaust guide pipe between the exhaust pipe and the fifth control valve, a supercharger is arranged on an air inlet guide pipe between the air inlet pipe and the mixer, and a second intercooler is arranged on an air inlet guide pipe between the air inlet pipe and the supercharger.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
in the starting stage of the internal combustion engine, the inert gas and oxygen are mixed to be used as the air inlet of the internal combustion engine, when the air temperature is low and the internal combustion engine is in cold start, the oxygen proportion can be properly increased, so that the internal combustion engine is easy to start, the combustion temperature in a cylinder of the internal combustion engine is increased as soon as possible, the warming-up time is shortened, and the generation of hydrocarbon HC in the low-temperature warming-up process is reduced; when the internal combustion engine continuously operates after being started, the intake of the internal combustion engine is mixed with the tail gas which flows back to the intake system of the internal combustion engine and is cooled, so that the exhaust gas recirculation is realized, and harmful gases and soot particle pollutants can be further reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1-internal combustion engine, 2-air inlet pipe, 3-oxygen generator, 4-oxygen storage tank, 5-inert gas storage tank, 6-mixer, 7-air inlet conduit, 8-exhaust pipe, 9-exhaust conduit, 10-first control valve, 11-second control valve, 12-third control valve, 13-fourth control valve, 14-fifth control valve, 15-tail gas pipe, 16-air supplement pipe, 17-air pump, 18-first intercooler, 19-supercharger, 20-second intercooler, 21-aftertreatment mechanism, 22-air inlet, 23-nitrogen outlet.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1, an intake and exhaust treatment control method for an internal combustion engine includes:
when the internal combustion engine is started, uniformly mixing oxygen and inert gas according to a first set proportion, and inputting the mixture into an air inlet pipe 2 of the internal combustion engine 1 for the internal combustion engine to run, wherein the inert gas does not participate in combustion and is used for adjusting the proportion of the oxygen in the air inlet pipe 2 to prevent the problem of cylinder burning caused by overheating due to overhigh proportion of the oxygen; the first set proportion is that the inert gas and the oxygen are 3.7: 1-1: 1, the proportion of the inert gas and the oxygen is continuously adjustable, the mixed gas of the inert gas and the oxygen enters a cylinder of the internal combustion engine 1 through an air inlet pipe 2 and is fully mixed with fuel, according to the characteristics of the fuel, a spark plug electronic ignition mode or a compression ignition mode can be adopted for ignition, the atomized fuel and the mixed gas of the air inlet pipe 2 are ignited, and the internal combustion engine 1 is started to ignite successfully;
when the internal combustion engine is started successfully, the inert gas is closed, partial tail gas of the internal combustion engine is obtained, oxygen and the tail gas are uniformly mixed according to a second set proportion and then are input into the air inlet pipe 2 for the internal combustion engine to run, the second set proportion is that the ratio of the tail gas to the oxygen is 1: 1-7: 1, the ratio of the tail gas to the oxygen is continuously adjustable, the oxygen demand can be adjusted in real time according to the running working condition of the internal combustion engine, the internal combustion engine 1 is enabled to be in the optimal air-fuel ratio state all the time, the dynamic property, the economical efficiency and the emission of soot particles are reduced.
The inert gas may be any one of helium, neon, argon, krypton, and xenon, and preferably, the inert gas in this embodiment is argon.
The obtained tail gas is subjected to aftertreatment, specifically, the tail gas sequentially passes through a diesel oxidation catalyst DOC and carbonA smoke particle catcher DPF and a selective catalytic reduction device SCR. The fuel oil mainly contains C, H, S elements, N elements and oxygen and argon, so the content of nitrogen or nitrogen compound is very low. Therefore, in the exhaust gas aftertreatment device, the DOC device mainly oxidizes carbon monoxide CO and HC hydrocarbons to generate mainly carbon dioxide CO2Water H2O, part of the soot particles, and oxidation of very traces of NOx to NO2. The DPF traps soot particles and performs an active or passive regeneration cycle. While the SCR device reacts to the trace amount of NO previously generated by the oxidation reaction in the DOC2Catalytic reaction to generate trace N2And H2O。
An air inlet and exhaust treatment system of an internal combustion engine comprises an oxygen generator 3, an oxygen storage tank 4, an inert gas storage tank 5, a mixer 6, an air inlet guide pipe 7 connected with an air inlet pipe 2 in the internal combustion engine 1 and an exhaust guide pipe 9 connected with an exhaust pipe 8 in the internal combustion engine 1, wherein the mixer 6 is arranged at one end, close to the air inlet pipe 2, of the air inlet guide pipe 7, a first control valve 10 is arranged at one end, far away from the air inlet pipe 2, of the air inlet guide pipe 7, the inert gas storage tank 5 is connected with the air inlet guide pipe 7 through a second control valve 11, the oxygen storage tank 4 is connected with the air inlet guide pipe 7 through a third control valve 12, an oxygen output end of the oxygen generator 3 is connected with the air inlet guide pipe 7 through a fourth control valve 13, a fifth control valve 14 is arranged on;
when the internal combustion engine is started, the opening degrees of the second control valve 11, the third control valve 12 and the fourth control valve 13 are controlled according to the method to provide the internal combustion engine with a proper amount of gas;
after the internal combustion engine is successfully started, the opening degrees of the third control valve 12, the fourth control valve 13 and the fifth control valve 14 are controlled according to the method to provide the internal combustion engine with a proper amount of gas.
The oxygen output end of the oxygen generator 3 is connected with the oxygen storage tank 4 through an air supply pipe 16, and an air pump 17 is arranged on the air supply pipe 16 and can supply oxygen into the oxygen storage tank 4 in time.
An aftertreatment mechanism 21 is arranged on the exhaust guide pipe 9 between the exhaust pipe 8 and the fifth control valve 14, and the aftertreatment mechanism 21 comprises at least one of a diesel oxidation catalyst DOC, a soot trap DPF, and a selective catalytic reduction device SCR. Preferably, the aftertreatment mechanism 21 in this embodiment includes a diesel oxidation catalyst DOC, a soot trap DPF, and a selective catalytic reduction device SCR connected in sequence, and the main functions of the SCR are that when the oxygen generator 3 and the oxygen storage tank 4 are completely out of service and no oxygen is generated, and when other emergency needs to take gas from the atmosphere, the second control valve 11, the third control valve 12, and the fourth control valve 13 will be closed at the same time, the first control valve 10 is opened, the internal combustion engine 1 takes gas from the atmosphere, and at this time, the nitrogen content in the air reaches 78%, so that the SCR needs to treat a large amount of NOx in the exhaust gas to ensure the requirements of environmental regulations. When the oxygen generator 3 and the oxygen storage tank 4 can work normally, the tail gas of the internal combustion engine only contains trace NOx, and the urea spraying amount of the SCR device is greatly reduced, so that the use cost of the internal combustion engine is saved, and the service life of the SCR device is prolonged.
The exhaust duct 9 between the exhaust pipe 8 and the fifth control valve 14 is provided with a first intercooler 18, the purified tail gas is cooled by the first intercooler 18, and the first intercooler 18 can be cooled by seawater, fresh water or air. The first intercooler 18 preferably adopts a structure of cooling pipes and special-shaped cooling fins to effectively cool the tail gas, the temperature of the cooled tail gas is set to be less than 70 ℃, meanwhile, the lower temperature can reduce the exhaust energy, so that the thermal motion of carbon smoke particle molecules in the tail gas is greatly attenuated, and the residual carbon smoke particles are further settled and collected in the first intercooler 18. A supercharger 19 is arranged on the air inlet guide pipe 7 between the air inlet pipe 2 and the mixer 6, and a second intercooler 20 is arranged on the air inlet guide pipe 7 between the air inlet pipe 2 and the supercharger 19 and used for cooling the temperature of the supercharged air inlet. The supercharger 19 may be a mechanical supercharger or a turbo supercharger.
The oxygen generator 3 can be a porous carbon molecular sieve oxygen generator, after air is pressurized, air enters the oxygen generator 3 from the air inlet 22, the nitrogen and the oxygen in the air are separated by utilizing the characteristic that the oxygen kinetic diameter is smaller than the nitrogen kinetic diameter, and the diffusion speed of the oxygen in the carbon molecular sieve is higher than that of the nitrogen, and the nitrogen is discharged from the nitrogen outlet 23. Of course, the oxygen generator 3 may also be a cryogenic air separation type oxygen generator, which separates and produces oxygen by using the principle that the boiling point of liquid nitrogen is higher than that of liquid oxygen. Considering the complexity and safety of the equipment, the porous carbon molecular sieve oxygen generator is preferably used for separating nitrogen and oxygen in the air. The separated nitrogen can be discharged to the atmosphere, the separated oxygen can enter the mixer 6 through the third control valve 13, and the redundant oxygen can enter the oxygen storage tank 4 for storage.
In the starting stage of the internal combustion engine, the inert gas and oxygen are mixed to be used as the air inlet of the internal combustion engine, when the air temperature is low and the internal combustion engine is in cold start, the oxygen proportion can be properly increased, so that the internal combustion engine is easy to start, the combustion temperature in a cylinder of the internal combustion engine is increased as soon as possible, the warming-up time is shortened, and the generation of hydrocarbon HC in the low-temperature warming-up process is reduced; when the internal combustion engine continuously operates after being started, the intake of the internal combustion engine is mixed with the tail gas which flows back to the intake system of the internal combustion engine and is cooled, so that the exhaust gas recirculation is realized, and harmful gases and soot particle pollutants can be further reduced. The invention can greatly reduce the discharge of NOx compounds and carbon smoke particles, reduce the dependence on an after-treatment system, reduce the use load of the after-treatment system, prolong the service life of the after-treatment device and save the operation and maintenance cost.
The above is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that several variations and modifications can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.

Claims (10)

1. An intake and exhaust treatment control method for an internal combustion engine, characterized by comprising:
when the internal combustion engine is started, uniformly mixing oxygen and inert gas according to a first set proportion, and then inputting the mixture into an air inlet pipe (2) of the internal combustion engine (1) for the internal combustion engine to run;
and when the internal combustion engine is successfully started, closing the inert gas, obtaining partial tail gas of the internal combustion engine, uniformly mixing the oxygen and the tail gas according to a second set proportion, and inputting the mixture into the air inlet pipe (2) for the internal combustion engine to run.
2. The intake-exhaust treatment control method of an internal combustion engine according to claim 1, wherein the acquired exhaust gas is exhaust gas after-treatment.
3. The intake and exhaust treatment control method of an internal combustion engine according to claim 2, wherein the after-treatment is specifically that the exhaust is sequentially treated by a Diesel Oxidation Catalyst (DOC), a soot particulate trap (DPF) and a selective catalytic reduction device (SCR).
4. The intake-exhaust treatment control method for the internal combustion engine according to claim 1, wherein the first set ratio is 3.7:1 to 1: 1.
5. The intake-exhaust treatment control method for the internal combustion engine according to claim 1, wherein the second set ratio is 1:1 to 7: 1.
6. The air inlet and exhaust treatment system of the internal combustion engine is characterized by comprising an oxygen generator (3), an oxygen storage tank (4), an inert gas storage tank (5), a mixer (6), an air inlet guide pipe (7) connected with an air inlet pipe (2) in the internal combustion engine (1), and an exhaust guide pipe (9) connected with an exhaust pipe (8) in the internal combustion engine (1), wherein the mixer (6) is arranged at one end, close to the air inlet pipe (2), of the air inlet guide pipe (7), a first control valve (10) is arranged at one end, far away from the air inlet pipe (2), of the air inlet guide pipe (7), the inert gas storage tank (5) is connected with the air inlet guide pipe (7) through a second control valve (11), the oxygen storage tank (4) is connected with the air inlet guide pipe (7) through a third control valve (12), and an oxygen output end of the oxygen generator (3) is connected with the air inlet guide pipe (7) through a fourth control, a fifth control valve (14) is arranged on the exhaust guide pipe (9), and the fifth control valve (14) is connected with the input end of the mixer (6) through a tail gas pipe (15);
when the internal combustion engine is started, controlling the opening degrees of the second control valve (11), the third control valve (12) and the fourth control valve (13) according to the method of any one of claims 1 to 5 to provide an appropriate amount of gas to the internal combustion engine;
controlling the opening degrees of the third control valve (12), the fourth control valve (13) and the fifth control valve (14) according to the method of any one of claims 1-5 to provide an appropriate amount of gas to the internal combustion engine when the internal combustion engine is started successfully.
7. The intake and exhaust treatment system of an internal combustion engine according to claim 6, wherein the oxygen output end of the oxygen generator (3) is connected to the oxygen storage tank (4) through an air supply pipe (16), and an air pump (17) is arranged on the air supply pipe (16).
8. An intake and exhaust treatment system for an internal combustion engine according to claim 6, wherein an after-treatment mechanism (21) is provided on the exhaust conduit (9) between the exhaust pipe (8) and the fifth control valve (14).
9. An internal combustion engine intake and exhaust gas treatment system according to claim 8, wherein the aftertreatment means (21) comprises at least one of a Diesel Oxidation Catalyst (DOC), a soot trap (DPF), a selective catalytic reduction device (SCR).
10. An intake and exhaust treatment system for an internal combustion engine according to claim 6, wherein a first intercooler (18) is provided in the exhaust conduit (9) between the exhaust pipe (8) and the fifth control valve (14), a supercharger (19) is provided in the intake conduit (7) between the intake pipe (2) and the mixer (6), and a second intercooler (20) is provided in the intake conduit (7) between the intake pipe (2) and the supercharger (19).
CN202110257619.0A 2021-03-09 2021-03-09 Method and system for controlling air intake and exhaust treatment of internal combustion engine Active CN112879169B (en)

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* Cited by examiner, † Cited by third party
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CN115434833A (en) * 2022-09-30 2022-12-06 南通中远海运川崎船舶工程有限公司 Novel cooling water system of EGR host computer

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CN105422325A (en) * 2015-12-03 2016-03-23 华南理工大学 Large diesel engine tail gas circulation treatment system and method
CN107917002A (en) * 2016-10-06 2018-04-17 曼柴油机和涡轮机欧洲股份公司 Startup for explosive motor prepares and the method for subsequent start-up
CN109736936A (en) * 2018-12-30 2019-05-10 北京工业大学 The zero nitrogen HC fuel spark ignition type rotor machine and its control method of controllable Pressure Rise Rate

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Publication number Priority date Publication date Assignee Title
CN1387606A (en) * 1999-09-06 2002-12-25 创新内燃机技术股份有限公司 Internal combustion engine for motor vehicle and method for operating same
JP2012021530A (en) * 2010-07-13 2012-02-02 IFP Energies Nouvelles Method of controlling combustion phase of fuel mixture of spark-ignition supercharging type internal-combustion engine
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115434833A (en) * 2022-09-30 2022-12-06 南通中远海运川崎船舶工程有限公司 Novel cooling water system of EGR host computer

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