CN109681332B - Engine exhaust system - Google Patents
Engine exhaust system Download PDFInfo
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- CN109681332B CN109681332B CN201811477999.3A CN201811477999A CN109681332B CN 109681332 B CN109681332 B CN 109681332B CN 201811477999 A CN201811477999 A CN 201811477999A CN 109681332 B CN109681332 B CN 109681332B
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- air inlet
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- egr
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- 239000007789 gas Substances 0.000 claims description 88
- 238000007789 sealing Methods 0.000 claims description 10
- 238000004064 recycling Methods 0.000 claims description 6
- 239000002737 fuel gas Substances 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 16
- 238000002347 injection Methods 0.000 abstract description 11
- 239000007924 injection Substances 0.000 abstract description 11
- 238000002485 combustion reaction Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
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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
- F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses an engine exhaust system, and belongs to the field of internal combustion engines. For the existing exhaust system, additional device parts are often required to be added for improving the EGR rate, meanwhile, the engine economy is poor due to the fact that back pressure is improved, and the existing common method for improving the exhaust temperature often causes the increase of the oil consumption of the engine or extremely high cost for improving the exhaust temperature to a desired degree. According to the invention, the engine cylinders are arranged in groups, the air inlet switching valve is added on the air inlet pipeline of one group of cylinders, the adjustable control valve is added on the air outlet pipeline to realize cylinder closing of the air cylinder of the adjustable air path, and meanwhile, the temperature of an exhaust system is improved by matching with the in-cylinder fuel injection control, so that the EGR rate can be improved on the premise of ensuring the economy of the engine.
Description
Technical Field
The invention belongs to the field of internal combustion engines, and particularly relates to an engine exhaust system.
Background
In the process of engine operation, part of exhaust gas is introduced into an air inlet pipe, mixed with fresh air or atomized mixture gas and then enters an engine cylinder for re-combustion. This method is an effective measure for reducing NOx emissions. The task of the EGR system is to optimize the recirculation of exhaust gases at each operating point so that the combustion process is always optimal, ultimately ensuring that the pollutant content of the emissions is minimal. Therefore, the EGR demand varies from engine operating condition to engine operating condition, and a larger amount of exhaust gas is often required in some operating conditions. High pressure before turbineThe introduction of exhaust gas into the charge air after the charge air is one of the main methods for realizing the recirculation of exhaust gas, and in most working conditions, the exhaust pressure before the turbine is larger than the charge air pressure after the charge air, so that a certain recirculation amount of exhaust gas can be realized. However, since the pressure difference between the high-pressure exhaust gas and the high-pressure intake gas is limited, it is difficult to achieve a high EGR rate, NO X The drop is limited. The patent application CN1076438C is a rotary diesel engine electric EGR valve, the patent application CN106065834A is an EGR valve assembly, and the patent application CN106762250A is an EGR valve of a diesel engine, wherein the EGR valves are arranged in series in the EGR pipeline 12 in the above patent structures, even if certain difficulty exists in the engineering application of a supercharger engine due to the fact that the introduction of the EGR is usually caused when the opening degree of the EGR valve (a valve for controlling the introduction amount of the EGR) is maximum, the supercharging pressure is lower at a small load, and the exhaust gas can be introduced by virtue of the advantage that the pressure of the exhaust gas before the turbine is higher than that of the fresh air after the supercharging after the exhaust gas is introduced before the turbine is connected into the supercharger, but the EGR rate is limited to a certain extent; at high loads, the pressure of the air after pressurization is high, and even if the EGR valve opening is maximized, the check valve is used, because the boost pressure is higher than the exhaust pressure, the exhaust gas cannot be introduced into the EGR line 12.
To meet the requirements of SCR (Selective Catalytic Reduction, a selective catalytic reduction, an aftertreatment device to reduce NOx emissions) high efficiency and DPF (DieselParticulate Filter, diesel particulate filter, a device installed in a diesel exhaust system to reduce particulate matter in exhaust gas by filtration) at exhaust gas temperature during regeneration, the temperature needs to be maintained above a minimum threshold temperature during operation of the aftertreatment device so that the system can operate effectively. Engine exhaust gas thermal management techniques are becoming increasingly popular. For the working condition of low speed and low load, the exhaust temperature is lower, and the current common temperature raising mode adopts modes of an air inlet throttle valve, post-injection or adding an HC nozzle in an exhaust pipeline.
In these exhaust systems, it is often necessary to add additional device parts in order to increase the EGR rate, and at the same time, increasing the back pressure causes deterioration of the engine economy, and the conventional method of increasing the exhaust gas temperature often causes an increase in the fuel consumption of the engine, or it takes a very high cost to increase the temperature of the exhaust gas to a desired level.
Disclosure of Invention
The invention aims to provide an engine exhaust system, which can adjust the quantity of circulating exhaust gas entering an engine air inlet system, and can still realize the introduction of higher exhaust gas circulation quantity when the supercharged engine is under high load.
The invention adopts the following technical scheme to realize the aim:
an engine exhaust system comprises more than two groups of cylinders, wherein one group is an adjustable air path cylinder 1, and the other groups are independent grouping cylinders 2; the adjustable air path cylinders 1 are connected with a first air inlet pipeline 4 through an air inlet manifold 3, and each group of independent grouping cylinders 2 are connected with a respective grouping air inlet pipeline 5 through the air inlet manifold 3; the adjustable gas path cylinders 1 are connected with a first exhaust pipeline 8 through an exhaust manifold 7, and each group of independent grouping cylinders 2 are connected with a respective grouping exhaust pipeline 9 through the exhaust manifold 7; an air inlet switch valve 6 is arranged on the first air inlet pipeline 4 and is used for controlling the opening and closing of the adjustable air passage cylinder 1; the grouping exhaust pipeline 9 is input into a turbine runner of the turbocharger 17; after flowing through the turbine runner, the fuel gas enters an exhaust aftertreatment device;
the first air inlet pipeline 4 and the grouping air inlet pipeline 5 are connected with an air inlet main pipe 13, the air inlet main pipe 13 is connected with an air inlet intercooler 15, the air inlet intercooler 15 is connected with a compressor 16, and gas sequentially enters the system through the compressor 16, the air inlet intercooler 15 and the air inlet main pipe 13;
the outlet of the first exhaust pipeline 8 is connected with an adjustable control valve 11, and the adjustable control valve 11 is provided with two outlets, namely an EGR outlet 19 and an exhaust outlet 18; wherein the EGR outlet 19 is connected with an EGR cooler through an EGR pipeline 12, and the exhaust pipeline of the EGR cooler is conveyed to the air inlet manifold 13; the exhaust outlet 18 is connected to the third exhaust line 10;
the turbocharger 17 may have only one flow passage or two symmetrical turbine flow passages of equal size, or may have two asymmetrical turbine flow passages of unequal size; when the turbocharger 17 has only one runner, the third exhaust line 10 is connected to the group exhaust line 9, and the group exhaust line 9 is fed into the turbine runner of the turbocharger 17; when the turbocharger 17 has a two-flow turbine, the group exhaust pipe 9 connecting the independent group cylinders 2 is inputted to a large flow passage of an asymmetric turbine of the turbocharger 17, or one of the symmetrical turbine flow passages; the adjustable gas path cylinder 1 exhaust gas may be fed into a small flow path of an asymmetric turbine of the turbocharger 17, or another flow path of the symmetric turbine flow path, through the third exhaust gas line 10.
The adjustable control element in the adjustable control valve 11 is positioned at the intersection of the pipelines; the side of the outlet of the first exhaust pipeline 8 and the contact area of the adjustable control element are provided with a convex contour structure A, the side of the inlet of the third exhaust pipeline 10 opposite to the first exhaust pipeline 8 and the contact area of the adjustable control element are provided with a convex contour structure B, and the wall surface between the EGR pipeline 12 and the third exhaust pipeline 10 opposite to the first exhaust pipeline 8 is provided with a concave contour to be matched with the adjustable control element; the adjustable control element is of a valve structure and can swing around a swing axis which is transverse to the flow direction of the exhaust gas; the swing axis is arranged vertically relative to the axes of the first exhaust pipeline 8, the EGR pipeline 12 and the third exhaust pipeline 10; the top of the adjustable control element can be matched with the convex contour structure A to form a sealing structure, the bottom of the adjustable control element is provided with a convex arc structure, a boss is arranged at a position corresponding to the wall surface of the third exhaust pipeline 10, and when the valve core seals the first exhaust pipeline 8, the inner wall surface of the inlet of the third exhaust pipeline 10 is in contact sealing with the boss;
the adjustable control element is used for recycling part or all of the exhaust gas of the adjustable gas path cylinder 1 to the engine air inlet system through the swinging of the adjustable control element by coacting with the convex contour structure A, the convex contour structure B and the concave contour as well as the inner wall surfaces of the first exhaust pipeline 8 and the third exhaust pipeline 10, and also can be used for sealing the EGR pipeline 12 for recycling the exhaust gas to the engine air inlet system; the adjustable control valve 11 can input part or all of the exhaust of the adjustable gas path cylinder 1 into an exhaust aftertreatment device through a third exhaust pipeline 10, and can also seal the third exhaust pipeline 10; the adjustable control valve 11 can seal the first exhaust pipeline 8, so that the exhaust gas of the adjustable gas path cylinder 1 cannot flow to the air inlet system through the EGR pipeline 12 and cannot flow to the exhaust gas aftertreatment device through the turbine runner.
The control method of the engine exhaust system comprises the following specific steps:
the first air inlet pipeline 4 is internally provided with an air inlet switch valve 6, when the engine is started in a cold mode and runs under medium and low load, the exhaust gas aftertreatment device needs to improve the exhaust gas temperature, when the adjustable control valve 11 seals the first exhaust pipeline 8, the air inlet switch valve 6 of the first group of air inlet pipes is closed, the adjustable air path cylinder 1 does not flow out of exhaust gas, the adjustment of the in-cylinder fuel injection strategy is regulated, the fuel feeding to the adjustable air path cylinder 1 is stopped, the closing of the adjustable air path cylinder 1 is realized, the independent grouping cylinder 2 keeps the output power of the engine unchanged by increasing the fuel injection quantity, and only the exhaust gas flowing out of the independent grouping cylinder 2 is input into the exhaust gas aftertreatment device.
When the engine is started cold and runs under medium and low load, the exhaust temperature needs to be increased, the air inlet switch valve 6 in the first air inlet pipeline 4 is closed, the adjustable control valve 11 seals the EGR outlet 19 or seals the air outlet 18, the first air outlet pipeline 8 is communicated with the grouping air outlet pipeline 9 or the air inlet main pipe 13, no exhaust gas flows out from the adjustable air path cylinder 1, the fuel is stopped from being fed into the adjustable air path cylinder 1, the adjustable air path cylinder 1 is still communicated with the air inlet or the third air outlet pipeline 10 through the EGR pipe, and the output power of the engine is kept unchanged by increasing the fuel injection quantity of the independent grouping air cylinder 2.
The invention has the beneficial effects that:
when the engine is started in a cold mode and runs under medium and low load, the exhaust temperature needs to be increased, the adjustable gas path cylinder 1 is closed, no exhaust gas flows out, fuel is stopped from being fed into the adjustable gas path cylinder 1, only the exhaust gas flowing out of the independent grouping cylinder 2 is input into an exhaust aftertreatment device, the independent grouping cylinder 2 keeps the output power of the engine unchanged by increasing the oil injection quantity, so that the exhaust temperature of the independent grouping cylinder 2 is increased and is input into the exhaust aftertreatment device, and even under the condition that the load of the internal combustion engine is lower, the exhaust aftertreatment device can still reach the high-efficiency running requirement temperature; in addition, the outlet of the first exhaust pipeline 8 is provided with an adjustable control valve 11 which can adjust the circulating exhaust gas quantity entering the air inlet system, and meanwhile, the introduction of higher exhaust gas circulating quantity can be still realized when the engine is under high load, so that the flexible adjustment of the EGR rate between 0% and 50% under all working conditions of the engine is realized.
Drawings
FIG. 1 is a schematic diagram of an engine exhaust system of the present invention.
FIG. 2 is a schematic illustration of the adjustable control valve sealing the EGR outlet 19, with the first set of cylinder exhausts all flowing through the third exhaust conduit to the aftertreatment device.
In the figure: 1-a first group of cylinders; 2-a second group of cylinders; 3-an intake manifold; 4-a first air inlet pipeline; 5-a second air inlet pipeline; 6-an air inlet switch valve; 7-an exhaust manifold; 8-a first exhaust line; 9-a second exhaust line; 10-a third exhaust line; 11-an adjustable control valve; 12-EGR pipeline; 13-an intake manifold; 14-an EGR cooler; 15-an air intake intercooler; a 16-compressor; 17-a turbocharger; 18-an exhaust outlet; 19-EGR outlet.
Detailed Description
The present embodiment further explains and describes the technical solution of the present invention by taking only two groups of cases as examples.
An engine exhaust system comprises two groups of cylinders, wherein one group is an adjustable air path cylinder 1, and the other group is an independent grouping cylinder 2; the adjustable air path cylinders 1 are connected with a first air inlet pipeline 4 through an air inlet manifold 3, and the independent grouping cylinders 2 are connected with grouping air inlet pipelines 5 through the air inlet manifold 3; the adjustable gas path cylinders 1 are connected with a first exhaust pipeline 8 through an exhaust manifold 7, and the independent grouping cylinders 2 are connected with grouping exhaust pipelines 9 through the exhaust manifold 7; an air inlet switch valve 6 is arranged on the first air inlet pipeline 4 and is used for controlling the opening and closing of the adjustable air passage cylinder 1; the grouping exhaust pipeline 9 is input into a turbine runner of the turbocharger 17; after flowing through the turbine runner, the fuel gas enters an exhaust aftertreatment device;
the first air inlet pipeline 4 and the grouping air inlet pipeline 5 are connected with an air inlet main pipe 13, the air inlet main pipe 13 is connected with an air inlet intercooler 15, the air inlet intercooler 15 is connected with a compressor 16, and gas sequentially enters the system through the compressor 16, the air inlet intercooler 15 and the air inlet main pipe 13;
the outlet of the first exhaust pipeline 8 is connected with an adjustable control valve 11, and the adjustable control valve 11 is provided with two outlets, namely an EGR outlet 19 and an exhaust outlet 18; wherein the EGR outlet 19 is connected with an EGR cooler through an EGR pipeline 12, and the exhaust pipeline of the EGR cooler is conveyed to the air inlet manifold 13; the exhaust outlet 18 is connected to the third exhaust line 10;
the turbocharger 17 may have only one flow passage or two symmetrical turbine flow passages of equal size, or may have two asymmetrical turbine flow passages of unequal size; when the turbocharger 17 has only one runner, the third exhaust line 10 is connected to the group exhaust line 9, and the group exhaust line 9 is fed into the turbine runner of the turbocharger 17; when the turbocharger 17 has a two-flow turbine, the group exhaust pipe 9 connecting the independent group cylinders 2 is inputted to a large flow passage of an asymmetric turbine of the turbocharger 17, or one of the symmetrical turbine flow passages; the adjustable gas path cylinder 1 exhaust gas may be fed into a small flow path of an asymmetric turbine of the turbocharger 17, or another flow path of the symmetric turbine flow path, through the third exhaust gas line 10.
The adjustable control element in the adjustable control valve 11 is positioned at the intersection of the pipelines; the side of the outlet of the first exhaust pipeline 8 and the contact area of the adjustable control element are provided with a convex contour structure A, the side of the inlet of the third exhaust pipeline 10 opposite to the first exhaust pipeline 8 and the contact area of the adjustable control element are provided with a convex contour structure B, and the wall surface between the EGR pipeline 12 and the third exhaust pipeline 10 opposite to the first exhaust pipeline 8 is provided with a concave contour to be matched with the adjustable control element; the adjustable control element is of a valve structure and can swing around a swing axis which is transverse to the flow direction of the exhaust gas; the swing axis is arranged vertically relative to the axes of the first exhaust pipeline 8, the EGR pipeline 12 and the third exhaust pipeline 10; the top of the adjustable control element can be matched with the convex contour structure A to form a sealing structure, the bottom of the adjustable control element is provided with a convex arc structure, a boss is arranged at a position corresponding to the wall surface of the third exhaust pipeline 10, and when the valve core seals the first exhaust pipeline 8, the inner wall surface of the inlet of the third exhaust pipeline 10 is in contact sealing with the boss;
the adjustable control element is used for recycling part or all of the exhaust gas of the adjustable gas path cylinder 1 to the engine air inlet system through the swinging of the adjustable control element by coacting with the convex contour structure A, the convex contour structure B and the concave contour as well as the inner wall surfaces of the first exhaust pipeline 8 and the third exhaust pipeline 10, and also can be used for sealing the EGR pipeline 12 for recycling the exhaust gas to the engine air inlet system; the adjustable control valve 11 can input part or all of the exhaust of the adjustable gas path cylinder 1 into an exhaust aftertreatment device through a third exhaust pipeline 10, and can also seal the third exhaust pipeline 10; the adjustable control valve 11 can seal the first exhaust pipeline 8, so that the exhaust gas of the adjustable gas path cylinder 1 cannot flow to the air inlet system through the EGR pipeline 12 and cannot flow to the exhaust gas aftertreatment device through the turbine runner.
The first air inlet pipeline 4 is internally provided with an air inlet switch valve 6, when the engine is started in a cold mode and runs under medium and low load, the exhaust gas aftertreatment device needs to improve the exhaust gas temperature, when the adjustable control valve 11 seals the first exhaust pipeline 8, the air inlet switch valve 6 of the first group of air inlet pipes is closed, the adjustable air path cylinder 1 does not flow out of exhaust gas, the adjustment of the in-cylinder fuel injection strategy is regulated, the fuel feeding to the adjustable air path cylinder 1 is stopped, the closing of the adjustable air path cylinder 1 is realized, the independent grouping cylinder 2 keeps the output power of the engine unchanged by increasing the fuel injection quantity, and only the exhaust gas flowing out of the independent grouping cylinder 2 is input into the exhaust gas aftertreatment device. This allows the relatively hot second set of cylinder exhausts to be fed into the exhaust aftertreatment device using the engine exhaust system, even at lower loads. Therefore, even in the case where the load of the internal combustion engine is low, the exhaust gas aftertreatment device can still reach the temperature required for its efficient operation, and particularly sufficient conversion or treatment of the harmful substances contained in the exhaust gas can be performed under the temperature condition. An exhaust gas aftertreatment device DPF (particulate filter) can be regenerated by increasing the exhaust gas temperature. In addition, in the working mode, the cylinder of the adjustable air path cylinder 1 is closed, the air in the adjustable air path cylinder 1 can not flow in the air inlet pipeline and the air outlet pipeline, no flow loss exists, and the economy is improved.
In this way, the temperature of the exhaust gas fed into the exhaust gas aftertreatment device can be increased particularly effectively. This eliminates the need for post-injection of fuel into the cylinders of the internal combustion engine. This is advantageous because the post-injection of fuel is performed later in time and thus the cylinder may be wetted with fuel, creating mechanical problems due to the concomitant dilution of the engine oil.
In another embodiment, when the engine is started cold and operates under medium and low load, the exhaust temperature needs to be increased, the air inlet switch valve 6 in the first air inlet pipeline 4 is closed, the adjustable control valve 11 seals the EGR outlet 19 or seals the air outlet 18, the first air outlet pipeline 8 is communicated with the group air outlet pipeline 9 or the air inlet main pipe 13, no exhaust gas flows out from the adjustable air path cylinder 1, the fuel is stopped from being fed into the adjustable air path cylinder 1, the adjustable air path cylinder 1 is still communicated with the air inlet or the third air outlet pipeline 10 through the EGR pipe, and the output power of the engine is kept unchanged by increasing the fuel injection quantity of the independent group air cylinder 2.
The adjustable control valve 11 controls the flow area of the EGR outlet 19 and the exhaust outlet 18 in an associated manner, and the flow area of the exhaust outlet 18 will be maximum when the EGR outlet 19 is closed, i.e. the flow area is zero; while the flow area of the EGR outlet 19 increases, the flow area of the exhaust outlet 18 decreases, and the flow area of the EGR outlet 19 is maximized when the exhaust outlet 18 is closed, i.e., the flow area is zero. When the exhaust gas flowing to the EGR pipeline 12 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, so that the resistance of the exhaust gas flowing to the EGR pipeline 12 of the first exhaust pipeline 8 is reduced, and meanwhile, the flow area of the exhaust outlet 18 is reduced, the resistance of the exhaust gas flowing to the third exhaust pipeline 10 in the first exhaust pipeline 8 can be increased, and the exhaust gas flowing to the EGR pipeline 12 is facilitated. The adjustable control valve 11 can adjust the flow direction of the high-pressure runner connected with the adjustable air path cylinder 1 to the EGR pipeline 12 and the exhaust distribution of the turbine runner, so as to realize the adjustment of the exhaust gas quantity flowing into the air inlet system of the engine. When the exhaust outlet 18 is closed, i.e. the flow area is zero, the flow area of the EGR outlet 19 will be maximum, all exhaust gases of the first exhaust pipe 8 will flow to the engine intake system through the EGR pipe 12, and the maximum EGR rate is 50%, so that flexible adjustment between 0% and 50% of the EGR rate can be achieved under all conditions of the engine.
Claims (1)
1. An engine exhaust system is characterized in that the engine is composed of more than two groups of cylinders, one group is an adjustable air path cylinder (1), and the other groups are independent grouping cylinders (2); the adjustable air path cylinders (1) are connected with a first air inlet pipeline (4) through an air inlet manifold (3), and each group of independent grouping cylinders (2) are connected with a respective grouping air inlet pipeline (5) through the air inlet manifold (3); the adjustable gas path cylinders (1) are connected with a first exhaust pipeline (8) through an exhaust manifold (7), and each group of independent grouping cylinders (2) are connected with each grouping exhaust pipeline (9) through the exhaust manifold (7); an air inlet switch valve (6) is arranged on the first air inlet pipeline (4) and used for controlling the opening and closing of the air cylinder (1) of the adjustable air pipeline; the grouping exhaust pipeline (9) is input into a turbine runner of the turbocharger (17); after flowing through the turbine runner, the fuel gas enters an exhaust aftertreatment device;
the first air inlet pipeline (4) and the grouping air inlet pipeline (5) are connected with an air inlet main pipe (13), the air inlet main pipe (13) is connected with an air inlet intercooler (15), the air inlet intercooler (15) is connected with a compressor (16), and gas enters the system through the compressor (16), the air inlet intercooler (15) and the air inlet main pipe (13) in sequence;
the outlet of the first exhaust pipeline (8) is connected with an adjustable control valve (11), and the adjustable control valve (11) is provided with two outlets, namely an EGR outlet (19) and an exhaust outlet (18); wherein the EGR outlet (19) is connected with an EGR cooler through an EGR pipeline (12), and is conveyed to the air inlet manifold (13) through an exhaust pipeline of the EGR cooler; the exhaust outlet (18) is connected with the third exhaust pipeline (10);
the turbocharger (17) is provided with a runner, two symmetrical turbine runners with equal size or two asymmetrical turbine runners with unequal size; when the turbocharger (17) has only one runner, the third exhaust line (10) is connected to the group exhaust line (9), and is input into the turbine runner of the turbocharger (17) through the group exhaust line (9); when the turbocharger (17) is provided with a double-flow-passage turbine, the group exhaust pipeline (9) connected with the independent group cylinders (2) is input into a large flow passage of an asymmetric turbine of the turbocharger (17) or one of the symmetrical turbine flow passages; the exhaust gas of the adjustable gas path cylinder (1) is input into a small flow passage of an asymmetric turbine of the turbocharger (17) or another flow passage of the symmetric turbine flow passage through a third exhaust pipeline (10);
an adjustable control element in the adjustable control valve (11) is positioned at the intersection of the pipelines; the side of the outlet of the first exhaust pipeline (8) and the contact area of the adjustable control element are provided with a convex contour structure A, the side of the inlet of the third exhaust pipeline (10) opposite to the first exhaust pipeline (8) and the contact area of the adjustable control element are provided with a convex contour structure B, and the wall surface, opposite to the first exhaust pipeline (8), between the EGR pipeline (12) and the third exhaust pipeline (10) is provided with a concave contour to be matched with the adjustable control element; the adjustable control element is of a valve structure and can swing around a swing axis which is transverse to the flow direction of the exhaust gas; the swing axis is vertically arranged relative to the axes of the first exhaust pipeline (8), the EGR pipeline (12) and the third exhaust pipeline (10); the top of the adjustable control element can be matched with the convex contour structure A to form a sealing structure, the bottom of the adjustable control element is provided with a convex arc structure, a boss is arranged at a position corresponding to the wall surface of the third exhaust pipeline (10), and when the valve core seals the first exhaust pipeline (8), the inner wall surface of the inlet of the third exhaust pipeline (10) is in contact sealing with the boss;
the adjustable control element is used for recycling part or all of the exhaust gas of the adjustable gas path cylinder (1) into an engine air inlet system or sealing an EGR pipeline (12) for recycling the exhaust gas into the engine air inlet system through the swinging of the adjustable control element by coacting with the convex contour structure A, the convex contour structure B and the concave contour and the inner wall surfaces of the first exhaust pipeline (8) and the third exhaust pipeline (10); the adjustable control valve (11) inputs part or all of the exhaust of the adjustable gas path cylinder (1) into an exhaust aftertreatment device through a third exhaust pipeline (10), or closes the third exhaust pipeline (10); the adjustable control valve (11) seals the first exhaust pipeline (8) so that the exhaust gas of the adjustable gas path cylinder (1) cannot flow to the air inlet system through the EGR pipeline (12) and cannot flow to the exhaust gas aftertreatment device through the turbine runner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811477999.3A CN109681332B (en) | 2018-12-05 | 2018-12-05 | Engine exhaust system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811477999.3A CN109681332B (en) | 2018-12-05 | 2018-12-05 | Engine exhaust system |
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| Publication Number | Publication Date |
|---|---|
| CN109681332A CN109681332A (en) | 2019-04-26 |
| CN109681332B true CN109681332B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811477999.3A Active CN109681332B (en) | 2018-12-05 | 2018-12-05 | Engine exhaust system |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110500208B (en) * | 2019-07-29 | 2020-10-27 | 东风商用车有限公司 | Controllable EGR system applying integrated double-channel EGR cooler |
| CN110529270A (en) * | 2019-08-22 | 2019-12-03 | 一汽解放汽车有限公司 | A kind of control method of engine exhaust temperature elevation system |
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