CN111042954A - Exhaust heating system of internal combustion engine - Google Patents

Exhaust heating system of internal combustion engine Download PDF

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Publication number
CN111042954A
CN111042954A CN201911232066.2A CN201911232066A CN111042954A CN 111042954 A CN111042954 A CN 111042954A CN 201911232066 A CN201911232066 A CN 201911232066A CN 111042954 A CN111042954 A CN 111042954A
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China
Prior art keywords
exhaust
cylinders
group
exhaust gas
engine
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CN201911232066.2A
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Chinese (zh)
Inventor
郭立新
钟博
史艳彬
董大陆
兰权
刘江唯
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FAW Jiefang Automotive Co Ltd
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FAW Jiefang Automotive Co Ltd
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Priority to CN201911232066.2A priority Critical patent/CN111042954A/en
Publication of CN111042954A publication Critical patent/CN111042954A/en
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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
    • 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
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/02—Cutting-out
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention discloses an exhaust heating system of an internal combustion engine, which belongs to the technical field of internal combustion engines.A control valve is additionally arranged on an exhaust pipeline of a first group of cylinders, when the engine is in cold start and operates under medium and low loads, the exhaust temperature needs to be improved, only the exhaust of a second group of cylinders flows out and is input into an exhaust post-processing device, the first group of cylinders realize cylinder closing, no exhaust gas flows out, an air inlet valve is simultaneously adjusted to reduce the air inflow entering the two groups of cylinders, the fuel is stopped to be fed into the first group of cylinders, and the output power of the engine is kept unchanged by increasing the fuel injection quantity by the second group of cylinders; the exhaust temperature is raised, the exhaust post-treatment device can still reach the temperature required by the efficient operation of the exhaust post-treatment device, particularly and fully convert or treat harmful substances contained in the exhaust under the temperature condition, and the exhaust flow is reduced, namely the reduction of the airspeed is favorable for improving the post-treatment conversion efficiency.

Description

Exhaust heating system of internal combustion engine
Technical Field
The invention belongs to the field of internal combustion engines, and particularly relates to an exhaust heating system of an internal combustion engine.
Background
An exhaust gas aftertreatment device is located in the exhaust pipe after the turbocharger of an engine to reduce or remove gases (e.g., nitrogen oxides (NO or NO)2Collectively referred to as NOx) And particulate emissions) to meet emission regulations. Various types of exhaust gas aftertreatment devices exist, such as Selective Catalytic Reduction (SCR) for NO in diesel exhaust emissionsxUnder the action of catalyst, in the post-treatment process, the quantitative feeding unit can accurately inject the urea quantity matched with the running condition of the engine into the exhaust pipe according to the instruction given by the electronic control unit of the engine, and the ammonia and nitrogen oxide decomposed from the urea are subjected to catalytic reduction reaction in the catalyst to finally generate harmless nitrogen (N)2) And water (H)2O). Particulate traps (DPFs) are effective at trapping particulate emissions in the exhaust.
During operation of the aftertreatment device, the temperature needs to be maintained above a minimum threshold temperature so that the system can operate efficiently. For example, the SCR system will have a minimum threshold temperature below which urea may not decompose and hydrolyze to NH3In this case, the SCR system does not reduce NO satisfactorilyxAnd (4) horizontal.
Along with the lengthening of the working time, more and more particulate matters are accumulated on the DPF, the exhaust back pressure is increased, the ventilation of the engine is influenced, the output power is reduced, and the oil consumption is increased. It is also desirable to increase the temperature of the exhaust gas above a certain temperature to cause certain oxides in the exhaust gas, such as NO2And O2, etc. can also oxidize the particulate matter in the particulate matter filter by itself, thereby achieving the purpose of particulate matter regeneration.
Disclosure of Invention
The invention aims to provide an internal combustion engine exhaust heating system which can adjust the amount of circulating exhaust gas entering an engine intake system and simultaneously realize the introduction of higher exhaust gas circulating amount, and in addition, the cylinder closing of a first group of cylinders is realized, the air inlet valve is adjusted to control the air inlet amount, and the effect of raising the temperature of the exhaust system is realized by matching with the in-cylinder fuel injection control.
An internal combustion engine exhaust gas heating system, the engine is formed by two groups of cylinders at least, two groups of cylinders connect the same intake manifold 11, connect through the intake duct 3; the two groups of cylinders are respectively connected with different exhaust pipelines, the first group of cylinders 1 is connected with a first exhaust pipeline 6 through an exhaust manifold 5, and the second group of cylinders 2 is connected with a second exhaust pipeline 7 through the exhaust manifold 5; the intake manifold 11 is provided with an intake valve 4 for controlling the adjustable intake air amount flowing through the intake manifold 11; the second exhaust pipeline 7 is input into a turbine runner of a turbocharger 15, and the gas enters an exhaust aftertreatment device after flowing through the turbine runner;
the air inlet main pipe 11 is connected with an air inlet intercooler 13, the air inlet intercooler 13 is connected with an air compressor 14, and air sequentially enters the system through the air compressor 14, the air inlet intercooler 13 and the air inlet main pipe 11;
an outlet of the first exhaust pipeline 6 is connected with an adjustable control valve 9, and the adjustable control valve 9 is provided with two outlets, namely an EGR outlet and an exhaust outlet; the EGR outlet is connected with an EGR cooler 12 through an EGR pipeline 10, the EGR is conveyed to an intake manifold 11 through an exhaust pipeline of the EGR cooler 12, and an EGR inlet of the EGR pipeline 10, which enters the intake manifold 11, is positioned at the downstream of an intake valve 4 in the intake manifold; the exhaust outlet is connected with a third exhaust pipeline 8, the third exhaust pipeline 8 is input into a turbine runner of a turbocharger 15, and the gas enters an exhaust aftertreatment device after flowing through the turbine runner;
the adjustable control valve 9 can partially or completely recirculate the exhaust gas of the first group of cylinders 1 into an engine air inlet system, and can also close an EGR pipeline for recirculating the exhaust gas into the engine air inlet system; the adjustable control valve can input part or all of the exhaust gas of the first group of cylinders 1 into an exhaust gas post-processing device after passing through a turbine runner through a third exhaust pipeline 8, and can also close the third exhaust pipeline 8; the adjustable control valve 9 can seal the first exhaust pipeline 6, so that exhaust gas of the first group of cylinders cannot flow to the air intake system through the EGR pipeline and cannot flow to the exhaust gas post-processing device through the turbine runner;
when the engine is in cold start and runs under medium and low load, the exhaust temperature needs to be improved, the adjustable control valve 9 closes the exhaust outlet and only opens the EGR outlet, the exhaust gas of the first group of cylinders 1 completely flows into the intake manifold again, only the exhaust gas flowing out of the second group of cylinders 2 is input into the exhaust gas post-processing device, no exhaust gas flows into the post-processing device by the first group of cylinders 1, meanwhile, the first group of cylinders 1 realize cylinder closing, the fuel is stopped being fed into the first group of cylinders 1, and the second group of cylinders 2 keep the output power of the engine unchanged by increasing the fuel injection quantity; or when the engine is in cold start and runs under medium and low load, the adjustable control valve is adjusted to adjust the flow distribution of the exhaust gas of the first group of cylinders 1 at the exhaust gas outlet and the EGR outlet, so that the exhaust gas of all the second group of cylinders 2 and part of the exhaust gas of the first group of cylinders 1 are input into the exhaust gas post-processing device, meanwhile, the fuel is fed into the first group of cylinders 1 in a reducing way, and the output power of the engine is kept unchanged by increasing the fuel injection quantity of the second group of cylinders 2; in order to further improve the exhaust temperature, the air inlet valve can be adjusted to reduce the air inflow entering the two groups of cylinders, and in order to keep the output power of the engine unchanged, the oil injection quantity of the engine is unchanged;
in another embodiment, when the engine is in cold start and runs under medium and low loads, the exhaust temperature needs to be increased, the intake valve and the exhaust valve can be closed through the variable valve driving system, only the exhaust gas flowing out from the second group of cylinders 2 is input into the exhaust gas post-processing device, the first group of cylinders 1 does not flow out, the fuel is stopped being fed into the first group of cylinders 1, the first group of cylinders 1 realizes cylinder closing, and the second group of cylinders 2 keeps the output power of the engine unchanged by increasing the fuel injection quantity; to further increase the exhaust temperature, the intake valve may be adjusted to reduce the amount of intake air in the event that sufficient air is required for combustion.
The turbocharger 15 may have only one flow passage or two symmetrical turbine flow passages with equal size, or two asymmetrical turbine flow passages with unequal size; when the turbocharger has only one flow channel, the third exhaust line 8 is connected to the second exhaust line 7 and is fed into the turbocharger turbine flow channel via the second exhaust line 7; when the turbocharger 15 has a double-flow turbine, the second exhaust line 7 feeds the large flow path of the asymmetrical turbine of the turbocharger 15, or one of the flow paths of the symmetrical turbine; the exhaust gases of the first group of cylinders 1 can be fed via a third exhaust line 8 to a small flow channel of an asymmetrical turbine of the turbocharger 15 or to another flow channel of a symmetrical turbine flow channel.
The invention has the beneficial effects that:
when the engine is in cold start and operates under medium and low load, the exhaust temperature needs to be improved, the adjustable control valve closes the exhaust outlet, only the EGR outlet is opened, the exhaust gas of the first group of cylinders flows into the air inlet main pipe again, only the exhaust gas of the second group of cylinders flows out and is input into the exhaust post-processing device, the first group of cylinders realizes cylinder closing, no exhaust gas flows out, meanwhile, the air inlet valve is adjusted, the air input into the two groups of cylinders is reduced, the exhaust flow is reduced, namely, the airspeed is reduced, the residence time of the exhaust gas in the post-processing device is increased, the reaction time is increased, and the conversion efficiency of the exhaust post-processing; stopping feeding fuel to the first group of cylinders, and keeping the output power of the engine unchanged by increasing the fuel injection quantity of the second group of cylinders; the exhaust temperature is raised, so that the exhaust post-treatment device can still reach the temperature required by the efficient operation of the exhaust post-treatment device, the conversion efficiency of SCR is improved, the active regeneration efficiency of DPF is improved, particularly and fully conversion or treatment is carried out on harmful substances contained in the exhaust, meanwhile, the passive regeneration frequency of DPF is reduced, and the fuel is saved; in addition, the outlet of the first exhaust pipeline is provided with an adjustable control valve which can adjust the amount of circulating exhaust gas entering the air intake system, and simultaneously, the introduction of higher exhaust gas circulating amount can still be realized under all working conditions of the engine, and the flexible adjustment of the EGR rate between 0 and 50 percent under all working conditions of the engine is realized. In addition, exhaust gas of the first group of cylinders cannot flow to an air inlet system through an EGR pipeline and cannot flow to an exhaust aftertreatment device through a turbine runner by throttling or closing the first exhaust pipeline, so that exhaust back pressure is increased, and the exhaust brake valve has the function of an exhaust brake valve.
Drawings
FIG. 1 is a schematic diagram of an internal combustion engine exhaust gas temperature increasing system of the present invention.
In the figure: 1-a first group of cylinders; 2-a second group of cylinders; 3, an air inlet channel; 4-an air inlet valve; 5-an exhaust manifold; 6-a first exhaust line; 7-a second exhaust line; 8-a third exhaust line; 9-an adjustable control valve; 10-an EGR line; 11-an intake manifold; 12-an EGR cooler; 13-an intake intercooler; 14-a compressor; 15-turbocharger.
Detailed Description
An exhaust gas temperature increasing system of an internal combustion engine according to the present invention will be described with reference to fig. 1.
An internal combustion engine exhaust gas heating system, the engine is formed by two groups of cylinders at least, two groups of cylinders connect the same intake manifold 11, connect through the intake duct 3; the two groups of cylinders are respectively connected with different exhaust pipelines, the first group of cylinders 1 is connected with a first exhaust pipeline 6 through an exhaust manifold 5, and the second group of cylinders 2 is connected with a second exhaust pipeline 7 through the exhaust manifold 5; the intake manifold 11 is provided with an intake valve 4 for controlling the adjustable intake air amount flowing through the intake manifold 11; the second exhaust pipeline 7 is input into a turbine runner of a turbocharger 15, and the gas enters an exhaust aftertreatment device after flowing through the turbine runner;
the air inlet main pipe 11 is connected with an air inlet intercooler, the air inlet intercooler 13 is connected with the air compressor 14, and air sequentially enters the system through the air compressor 14, the air inlet intercooler 13 and the air inlet main pipe 11;
an outlet of the first exhaust pipeline 6 is connected with an adjustable control valve 9, and the adjustable control valve 9 is provided with two outlets, namely an EGR outlet and an exhaust outlet; the EGR outlet is connected with an EGR cooler through an EGR pipeline 10, the EGR is conveyed to an air intake manifold 11 through an exhaust pipeline of the EGR cooler, and an EGR inlet of the EGR pipeline 10, which enters the air intake manifold 11, is positioned in the air intake manifold 11 at the downstream of an air intake valve 4; the exhaust outlet is connected with a third exhaust pipeline 8, the third exhaust pipeline 8 is input into a turbine runner of a turbocharger 15, and the gas enters an exhaust aftertreatment device after flowing through the turbine runner;
the adjustable control valve 9 can partially or completely recirculate the exhaust gas of the first group of cylinders 1 into an engine air inlet system, and can also close an EGR pipeline 10 for recirculating the exhaust gas into the engine air inlet system; the adjustable control valve 9 can input part or all of the exhaust gas of the first group of cylinders 1 into an exhaust gas post-processing device after passing through a turbine runner through a third exhaust pipeline 8, and can also close the third exhaust pipeline 8; the adjustable control valve 9 can seal the first exhaust pipeline 6, so that exhaust gas of the first group of cylinders 1 cannot flow to an air intake system through the EGR pipeline 10 and cannot flow to an exhaust gas post-processing device through a turbine runner;
when the engine is in cold start and runs under medium and low load, the exhaust temperature needs to be raised, the adjustable control valve 9 closes the exhaust outlet and only opens the EGR outlet, the exhaust gas of the first group of cylinders 1 completely flows into the intake manifold 11 again, only the exhaust gas flowing out of the second group of cylinders 2 is input into the exhaust gas post-processing device, no exhaust gas flows into the post-processing device by the first group of cylinders 1, meanwhile, the first group of cylinders 1 realize cylinder closing, the fuel is stopped being fed into the first group of cylinders 1, and the second group of cylinders 2 keep the output power of the engine unchanged by increasing the fuel injection quantity; or when the engine is started in a cold state and runs under a medium-low load, the adjustable control valve 9 is adjusted to adjust the flow distribution of the exhaust gas of the first group of cylinders 1 at an exhaust outlet and an EGR outlet, so that the exhaust gas of all the second group of cylinders 2 and part of the exhaust gas of the first group of cylinders 1 are input into an exhaust gas post-treatment device, meanwhile, the fuel is fed into the first group of cylinders 1 in a reduced way, and the output power of the engine is kept unchanged by increasing the fuel injection quantity of the second group of cylinders 2; in order to further increase the exhaust temperature, the inlet valve 4 may be adjusted to reduce the amount of intake air into the two banks of cylinders, and the amount of fuel injected into the engine may be kept constant in order to keep the engine output constant. Thus, even if the exhaust gas temperature is low at a low load of the engine, the exhaust gas having a high temperature can be supplied to the exhaust gas post-treatment device. Therefore, even in the case of a low load on the internal combustion engine, the exhaust gas aftertreatment device can still reach the temperature required for efficient operation thereof, and can particularly adequately convert or treat the pollutants contained in the exhaust gas at this temperature. The active regeneration efficiency of the DPF is improved, particularly sufficient conversion or treatment is carried out on harmful substances contained in the exhaust gas, meanwhile, the passive regeneration frequency of the DPF is reduced, and fuel is saved; the exhaust flow is reduced, namely the airspeed is reduced, so that the residence time of the exhaust in the post-treatment device is increased, the reaction time is increased, and the conversion efficiency of the exhaust post-treatment is favorably improved; adjusting the intake valve 4 can reduce the pressure in the intake manifold 11 after the throttle valve, so that the pressure at the EGR inlet of the intake manifold 11 is reduced, thereby reducing the exhaust pressure of the exhaust pipeline of the first group of cylinders 1 and reducing the pumping loss.
Said adjustable control valve 9 controls the flow area of the EGR outlet and the exhaust outlet in a correlated manner, the flow area of the exhaust outlet being the largest when the EGR outlet is closed, i.e. zero; while the EGR outlet flow area increases, the exhaust outlet flow area decreases, and when the exhaust outlet is closed, i.e., zero, the EGR outlet flow area is maximized. When the exhaust gas flowing to the EGR pipeline 10 needs to be increased under all working conditions of the engine, the flow area of the EGR outlet can be increased through the control valve, the resistance of the exhaust gas flowing to the EGR pipeline 10 from the first exhaust pipeline 6 is reduced, the flow area of the exhaust outlet is reduced, the resistance of the exhaust gas flowing to the third exhaust pipeline 8 from the first exhaust pipeline 6 can be increased, and the exhaust gas flowing to the EGR pipeline 10 is facilitated. The adjustable control valve 9 can adjust the exhaust distribution of the high-pressure flow channel connected with the first group of cylinders 1 to the EGR pipeline 10 and the turbine flow channel, so as to realize the adjustment of the exhaust volume flowing into the engine intake system. When the exhaust outlet is closed, namely the flow area is zero, the flow area of the EGR outlet is the largest, all the exhaust gas of the first exhaust pipeline 6 flows to the engine air inlet system through the EGR pipeline 10, the maximum EGR rate is 50%, and therefore the EGR rate can be flexibly adjusted between 0% and 50% under all working conditions of the engine.
In another embodiment, when the engine is in cold start and runs under medium and low loads, the exhaust temperature needs to be increased, the intake valve and the exhaust valve can be closed through the variable valve driving system, only the exhaust gas flowing out from the second group of cylinders 2 is input into the exhaust gas post-processing device, the first group of cylinders 1 does not flow out, the fuel is stopped being fed into the first group of cylinders 1, the first group of cylinders 1 realizes cylinder closing, and the second group of cylinders 2 keeps the output power of the engine unchanged by increasing the fuel injection quantity; to further increase the exhaust temperature, the inlet valve 4 may be adjusted to reduce the amount of intake air in the event that sufficient air is required for combustion.
The turbocharger 15 may have only one flow passage or two symmetrical turbine flow passages with equal size, or two asymmetrical turbine flow passages with unequal size; when the turbocharger 15 has only one flow channel, the third exhaust line 8 is connected to the second exhaust line 7 and is fed into the turbine flow channel of the turbocharger 15 via the second exhaust line 7; when the turbocharger 15 has a double-channel turbine, the exhaust line connecting the second group of cylinders 2 is fed into the large channel of the asymmetrical turbine of the turbocharger 15, or into one of the channels of the symmetrical turbine; the exhaust gases of the first group of cylinders 1 can be fed via a third exhaust line 8 to a small flow channel of an asymmetrical turbine of the turbocharger 15 or to another flow channel of a symmetrical turbine flow channel.
In this way, the temperature of the exhaust gas fed to the exhaust gas aftertreatment device can be increased particularly effectively, reducing the number of passive regenerations of the DPF, which reduces or even eliminates the need for post-injection of fuel into the cylinders of the internal combustion engine. This is advantageous because such post-injection of fuel is carried out at a later time and the cylinder may be wetted with fuel, causing mechanical problems due to concomitant oil dilution. Further, by throttling or closing the first exhaust line 6, the exhaust gas of the first group of cylinders 1 cannot flow to the intake system through the EGR line 10 and cannot flow to the exhaust gas aftertreatment device through the turbo runner, so that the exhaust back pressure is increased, and the exhaust brake valve function is provided.

Claims (4)

1. An internal combustion engine exhaust gas heating system, wherein an engine at least comprises two groups of cylinders, and the two groups of cylinders are connected with the same air inlet manifold (11) and are connected through an air inlet channel (3); the two groups of cylinders are respectively connected with different exhaust pipelines, the first group of cylinders (1) is connected with a first exhaust pipeline (6) through an exhaust manifold (5), and the second group of cylinders (2) is connected with a second exhaust pipeline (7) through the exhaust manifold (5); the air inlet main pipe (11) is provided with an air inlet valve (4) for controlling the adjustable air inflow flowing through the air inlet main pipe (11); the second exhaust pipeline (7) is input into a turbine runner of a turbocharger (15), and the combustion gas enters an exhaust aftertreatment device after flowing through the turbine runner;
the air inlet main pipe (11) is connected with an air inlet intercooler (13), the air inlet intercooler (13) is connected with a compressor (14), and air sequentially enters the system through the compressor (14), the air inlet intercooler (13) and the air inlet main pipe (11); the device is characterized in that an outlet of the first exhaust pipeline (6) is connected with an adjustable control valve (9), the adjustable control valve (9) is provided with two outlets, one is an EGR outlet, and the other is an exhaust outlet; the EGR outlet is connected with an EGR cooler (12) through an EGR pipeline (10), the EGR is conveyed to an intake manifold (11) through an exhaust pipeline of the EGR cooler (12), and an EGR inlet of the EGR pipeline (10) entering the intake manifold (11) is positioned at the downstream of an intake valve (4) in the intake manifold; the exhaust outlet is connected with a third exhaust pipeline (8), the third exhaust pipeline (8) is input into a turbine runner of a turbocharger (15), and the gas enters an exhaust aftertreatment device after flowing through the turbine runner;
the adjustable control valve (9) can partially or completely recirculate the exhaust gas of the first group of cylinders (1) to an engine air inlet system, and can also close an EGR pipeline for recirculating the exhaust gas to the engine air inlet system; the adjustable control valve can lead part or all of the exhaust gas of the first group of cylinders (1) to pass through a third exhaust pipeline (8) and then to be input into an exhaust gas post-processing device after passing through a turbine runner, and can also seal the third exhaust pipeline (8); the adjustable control valve (9) can seal the first exhaust pipeline (6), so that exhaust gas of the first group of cylinders cannot flow to the air intake system through the EGR pipeline and cannot flow to the exhaust aftertreatment device through the turbine runner.
2. The system for increasing the temperature of exhaust gases of internal combustion engines as claimed in claim 1, characterized in that the turbocharger (15) can have only one flow channel or two symmetrical turbine flow channels of equal size or two asymmetrical turbine flow channels of unequal size; when the turbocharger has only one flow passage, the third exhaust pipeline (8) is connected to the second exhaust pipeline (7) and is input into the turbine flow passage of the turbocharger through the second exhaust pipeline (7); when the turbocharger (15) is provided with a double-channel turbine, the second exhaust pipeline (7) is input into a large channel of an asymmetric turbine of the turbocharger (15) or one of the channels of the symmetric turbine; the exhaust gases of the first group of cylinders (1) can be fed to a small flow channel of an asymmetrical turbine of a turbocharger (15) or to another flow channel of a symmetrical turbine flow channel via a third exhaust line (8).
3. The exhaust gas temperature increasing system of the internal combustion engine according to claim 1, characterized in that when the engine is started in a cold state and operated under a medium-low load, the temperature of the exhaust gas needs to be increased, the adjustable control valve (9) closes the exhaust gas outlet and only opens the EGR outlet, the exhaust gas of the first group of cylinders (1) completely flows into the intake manifold again, only the exhaust gas flowing out of the second group of cylinders (2) is input into the exhaust gas post-treatment device, the first group of cylinders (1) does not flow the exhaust gas into the post-treatment device, meanwhile, the first group of cylinders (1) realizes cylinder closing, the fuel feeding to the first group of cylinders (1) is stopped, and the second group of cylinders (2) keeps the output power of the engine unchanged by increasing the fuel; or when the engine is in cold start and runs under medium and low load, the adjustable control valve is adjusted to adjust the flow distribution of the exhaust gas of the first group of cylinders (1) at the exhaust gas outlet and the EGR outlet, so that the exhaust gas of all the second group of cylinders (2) and part of the exhaust gas of the first group of cylinders (1) are input into the exhaust gas post-treatment device, meanwhile, the fuel feeding of the first group of cylinders (1) is reduced, and the output power of the engine is kept unchanged by increasing the fuel injection quantity of the second group of cylinders (2); in order to further increase the exhaust temperature, the air inlet valve can be adjusted to reduce the air inflow entering the two groups of cylinders, and in order to keep the output power of the engine unchanged, the fuel injection quantity of the engine is unchanged.
4. The exhaust gas temperature increasing system of the internal combustion engine according to claim 1, wherein when the engine is in cold start and is running under medium and low load, the exhaust gas temperature needs to be increased, the intake and exhaust valves can be closed through the variable valve driving system, only the exhaust gas flowing out of the second group of cylinders (2) is input into the exhaust gas aftertreatment device, the first group of cylinders (1) does not flow out of the exhaust gas, the fuel feeding to the first group of cylinders (1) is stopped, the first group of cylinders (1) realizes cylinder closing, and the second group of cylinders (2) keeps the output power of the engine unchanged through increasing the fuel injection quantity; to further increase the exhaust temperature, the intake valve may be adjusted to reduce the amount of intake air in the event that sufficient air is required for combustion.
CN201911232066.2A 2019-12-05 2019-12-05 Exhaust heating system of internal combustion engine Pending CN111042954A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112483270A (en) * 2020-11-25 2021-03-12 潍柴动力股份有限公司 Control method and device for engine cylinder and engine
CN114135392A (en) * 2021-12-02 2022-03-04 中国重汽集团济南动力有限公司 Engine thermal management system and method
CN118088335A (en) * 2024-04-26 2024-05-28 潍柴动力股份有限公司 EGR (exhaust gas recirculation) model regeneration control method and related device

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Application publication date: 20200421