CN110552780A - Engine air intake and exhaust system and engine - Google Patents
Engine air intake and exhaust system and engine Download PDFInfo
- Publication number
- CN110552780A CN110552780A CN201910945578.7A CN201910945578A CN110552780A CN 110552780 A CN110552780 A CN 110552780A CN 201910945578 A CN201910945578 A CN 201910945578A CN 110552780 A CN110552780 A CN 110552780A
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- Prior art keywords
- engine
- pipe
- intake
- air inlet
- exhaust
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Classifications
-
- 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
- F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
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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
- F02D23/00—Controlling engines characterised by their being supercharged
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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
- F02M26/08—EGR systems specially adapted for supercharged engines for engines having two or more intake charge compressors or exhaust gas turbines, e.g. a turbocharger combined with an additional compressor
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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
- F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
- F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Supercharger (AREA)
Abstract
The invention discloses an engine air inlet and exhaust system which comprises an air inlet pipe, an exhaust pipe and an EGR system, wherein the air inlet end of an exhaust gas circulating pipe of the EGR system is connected with the exhaust pipe, the air outlet end of the exhaust gas circulating pipe is connected with the air inlet pipe, the air inlet pipe between the joint of the exhaust gas circulating pipe and the air inlet end of an engine is connected with a first air inlet branch pipe and a second air inlet branch pipe in parallel through a three-way valve, the air outlet ends of the first air inlet branch pipe and the second air inlet branch pipe are both connected with the air inlet end of the engine, and. The scheme can start the auxiliary supercharging device and control the opening of the EGR valve when the acceleration requirement exists, improves the air inlet pressure and the air inlet amount of the engine, and improves the responsiveness of the engine. The scheme can also pressurize the inlet air of the engine again through the auxiliary pressurizing device, so that the exhaust pressure is improved, further the flow of the exhaust gas passing through the EGR system is increased, and finally the aims of improving the EGR rate and reducing NOx are fulfilled. The invention also discloses an engine.
Description
Technical Field
The invention relates to the technical field of engine air intake and exhaust systems, in particular to an engine air intake and exhaust system and an engine.
background
When an engine is accelerated, a large amount of fresh air is needed, while in a conventional supercharged engine, the turbine of a turbocharger is driven by engine exhaust gas, so that the compressor of the coaxial turbocharger is driven to press the fresh air into the engine, and the fresh air finally enters the engine through a long engine air inlet pipeline.
The EGR (Exhaust Gas Recirculation) technology is a more general means for reducing the emission of NOx pollutants at present, and the improvement of the EGR Exhaust Gas of the conventional supercharged engine needs to be matched by a complicated turbocharger, so that the inlet pressure of the EGR system of the engine is higher than the outlet pressure of the EGR system. However, the engine operation range is wide, and the matching of the turbocharger cannot be achieved, so that the EGR rate is low, even the EGR rate cannot be realized, and further the engine emission is deteriorated.
Therefore, how to improve the engine responsiveness and the EGR rate is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide an engine intake and exhaust system which can improve engine responsiveness and EGR rate. It is another object of the present invention to provide an engine.
In order to achieve the purpose, the invention provides the following technical scheme:
The utility model provides an engine advances exhaust system, includes intake pipe, blast pipe and EGR system, the inlet end of EGR system's exhaust-gas circulation pipe connect in the blast pipe just give vent to anger the end connect in the intake pipe, the exhaust-gas circulation pipe with between the junction of intake pipe and the engine inlet end the intake pipe has first air intake branch pipe and second air intake branch pipe through the three-way valve parallel connection, first air intake branch pipe with the end of giving vent to anger of second air intake branch pipe all connect in the engine inlet end, first air intake branch pipe has arranged supplementary supercharging device.
Preferably, the auxiliary pressure increasing device is an electronic pressure increasing device.
Preferably, the first intake branch pipe is further provided with a cooler.
Preferably, the auxiliary pressurizing device and the cooler are arranged in this order in the intake direction.
Preferably, the engine intake and exhaust system further comprises a turbocharger, a turbine of the turbocharger is connected with the exhaust pipe, and a compressor of the turbocharger is connected with the intake pipe.
Preferably, an intercooler is arranged in the air inlet pipe between the compressor and the joint of the exhaust gas circulation pipe and the air inlet pipe.
Preferably, the engine intake and exhaust system further comprises an engine control unit, and the engine control unit comprises an opening control module for adjusting the opening of the EGR valve of the EGR system, a three-way control module for controlling the direction of the three-way valve, and a supercharging control module for adjusting the rotation speed of the auxiliary supercharging device.
The invention provides an engine intake and exhaust system, which comprises an intake pipe, an exhaust pipe and an EGR system, wherein the intake end of a waste gas circulating pipe of the EGR system is connected with the exhaust pipe, the exhaust end of the waste gas circulating pipe is connected with the intake pipe, the intake pipe between the joint of the waste gas circulating pipe and the intake end of an engine is connected in parallel with a first intake branch pipe and a second intake branch pipe through a three-way valve, the exhaust ends of the first intake branch pipe and the second intake branch pipe are both connected with the intake end of the engine, and the first intake branch pipe is provided with an auxiliary supercharging.
The scheme adds the auxiliary supercharging device and the bypass pipeline connected with the auxiliary supercharging device in parallel on the basis of the air inlet pipe of the original high-pressure EGR system engine, and controls the flow direction of the mixed gas by controlling the direction of the three-way valve at the front end. The three-way valve is arranged at the side of the second air inlet branch pipe, namely the bypass pipeline is blocked, and the mixed air enters the engine through the auxiliary supercharging device; the three-way valve is arranged on the side of the first air inlet branch pipe, namely a front pipeline of the auxiliary supercharging device is blocked, and the mixed air directly enters the engine without passing through the auxiliary supercharging device.
This scheme can start supplementary supercharging device and control EGR system's EGR valve's aperture when having the demand of accelerating, improves engine inlet pressure and air input, for only closing or reducing the conventional EGR system engine of EGR valve aperture, this scheme can guarantee that the engine admits air more sufficient, reduces acceleration time, improves engine responsiveness. In addition, the scheme can also pressurize the engine intake air again through the auxiliary supercharging device, so that the exhaust pressure of the engine is increased, the driving pressure difference of the inlet and the outlet of the EGR system is further increased, the flow rate of the exhaust gas passing through the EGR system is increased, and the aims of increasing the EGR rate and reducing NOx are finally fulfilled.
The invention also provides an engine comprising the engine intake and exhaust system. The derivation process of the beneficial effect of the engine is substantially similar to the derivation process of the beneficial effect brought by the engine intake and exhaust system, and therefore, the description is omitted here.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic layout of an engine intake and exhaust system according to an embodiment of the present invention.
In fig. 1:
The system comprises an air inlet pipe 1, an air outlet pipe 2, an exhaust gas circulating pipe 3, a three-way valve 4, an electronic supercharger 5, a cooler 6, an engine 7, an engine control unit 8, an EGR cooler 9, an EGR valve 10, a first air inlet branch pipe 11, a second air inlet branch pipe 12, an intercooler 13, an air compressor 14 and a turbine 15.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic layout diagram of an engine intake and exhaust system according to an embodiment of the present invention.
In order to improve the responsiveness and EGR rate of an engine, the invention provides an air intake and exhaust system of the engine, which comprises an air intake pipe 1, an exhaust pipe 2 and an EGR system, wherein the air intake end of an exhaust gas circulating pipe 3 of the EGR system is connected to the exhaust pipe 2, the air outlet end of the exhaust gas circulating pipe 3 is connected to the air intake pipe 1, the air intake pipe 1 between the joint of the exhaust gas circulating pipe 3 and the air intake pipe 1 and the air intake end of the engine is connected in parallel with a first air intake branch pipe 11 and a second air intake branch pipe 12 through a three-way valve 4, the air outlet ends of the first air intake branch pipe 11 and the second air intake branch pipe 12 are both connected to the air intake end of the engine.
It should be noted that the auxiliary supercharging device in the present embodiment functions to further supercharge the mixture in the intake pipe 1 and then introduce the mixture into the engine 7, and specifically, the auxiliary supercharging device may be an electronic supercharger, a mechanical supercharger, or a general exhaust gas turbocharger, and these superchargers all can achieve the same purpose. In a preferred embodiment, the auxiliary charging device is an electronic supercharger 5.
Preferably, the first air intake branch pipe 11 is further provided with a cooler 6 for further cooling the mixed intake air and then entering the engine 7.
Preferably, the auxiliary charging device and the cooler 6 are arranged in series in the intake direction. Of course, it is also possible in this solution to arrange the cooler 6 in front of the auxiliary charging device, i.e. the cooler 6 and the auxiliary charging device are arranged in series in the intake direction.
As shown in fig. 1, the engine intake and exhaust system preferably further comprises a turbocharger, a turbine 15 of the turbocharger is connected with the exhaust pipe 2, and a compressor 14 of the turbocharger is connected with the intake pipe 1. Specifically, the engine air intake and exhaust system provided by the scheme is a supercharged EGR air intake and exhaust system, and the turbocharger can further improve the air intake pressure.
Preferably, an intercooler 13 is arranged in the intake pipe 1 between the connection of the exhaust gas circulation pipe 3 and the intake pipe 1 and the compressor 14. The intercooler 13 is used to achieve cooling of the intake air in the intake pipe 1.
It should be noted that the EGR system in this embodiment specifically includes the exhaust gas circulation pipe 3, the EGR cooler 9, and the EGR valve 10, as shown in fig. 1.
As shown in fig. 1, the intake air enters an intercooler 13 through a compressor 14 of the turbocharger, and is mixed with the exhaust gas of the EGR system, and the mixture is determined by a control three-way valve 4 to pass through an electronic supercharger 5 of a first intake branch pipe 11 or a second intake branch pipe 12 (i.e., a bypass pipe), and in one case, the mixture passes through the electronic supercharger 5 and a cooler 6 and enters an engine 7; alternatively, the mixture is introduced directly into the engine 7 through the second intake branch pipe 12 without passing through the electronic supercharger 5. The engine exhaust gas is divided into two paths through the exhaust pipe 2, one path directly pushes the turbine 15 of the turbocharger to rotate, and the other path is mixed with the intake air through the EGR cooler 9 and the EGR valve 10.
The scheme adds an auxiliary supercharging device, a cooler 6 and a bypass pipeline connected with the cooler in parallel on the basis of an air inlet pipe of an original high-pressure EGR system engine, and controls the circulation direction of mixed gas by controlling the direction of a three-way valve 4 at the front end. The three-way valve 4 is arranged at the side of the second air inlet branch pipe 12, namely a bypass pipeline is blocked, and the mixed gas enters the engine 7 through the auxiliary supercharging device; the three-way valve 4 is arranged at the side of the first air inlet branch pipe 11, namely a pipeline in front of the auxiliary supercharging device is blocked, and the mixed air directly enters the engine 7 without passing through the auxiliary supercharging device.
Preferably, the engine intake and exhaust system provided by the invention further comprises an Engine Control Unit (ECU)8, wherein the engine control unit 8 collects information such as the engine speed and the accelerator opening through a sensor, and controls the opening of the EGR valve 10, the direction of the three-way valve 4 and the rotating speed of the auxiliary supercharging device through the calculation of an internal calculation module. Specifically, the engine control unit 8 comprises an opening degree control module for adjusting the opening degree of an EGR valve 10 of the EGR system, a three-way control module for controlling the direction of the three-way valve 4, and a supercharging control module for adjusting the rotation speed of the auxiliary supercharging device. The dashed lines in fig. 1 represent the signal acquisition lines and control connection lines of the engine control unit 8.
In the conventional mode of the engine in the scheme, the three-way valve 4 is controlled to be arranged on the side of the first air inlet branch pipe 11, namely, air inlet air directly enters the engine 7 through the second air inlet branch pipe 12 without passing through an auxiliary supercharging device.
When the ECU detects that the change rate of the engine accelerator exceeds a threshold value delta r (can be calibrated), the ECU controls the three-way valve 4 to be arranged at the side of the second air inlet branch pipe 12, namely the bypass pipe side, starts the electronic supercharger 5 and closes or reduces the opening degree of the EGR valve 10 when the ECU determines that the engine has an acceleration demand at present. The electronic supercharger 5 is started to play a role in improving the air inlet pressure and the air inlet amount of the engine, the opening degree of the EGR valve is closed and reduced, the amount of waste gas passing through the EGR system can be reduced, the fresh air inlet amount is increased, and compared with a conventional EGR system engine which is only closed or reduced in the opening degree of the EGR valve, the system can ensure that the air inlet of the engine is more sufficient, the acceleration time is shortened, and the responsiveness of the engine is improved.
The invention not only can improve the dynamic property of the engine, but also can be used for increasing the flow rate of the exhaust gas flowing through the EGR system, thereby achieving the effect of reducing the NOx emission. If the EGR rate needs to be increased, the three-way valve 4 is placed on the side of the second air inlet branch pipe 12, the electronic supercharger 5 is started, and the mixed gas enters the cooler 6 after being supercharged by the electronic supercharger 5 and finally enters the engine 7. The electronic supercharger 5 can pressurize the engine intake air again, so that the engine exhaust pressure is increased, the driving pressure difference of the inlet and the outlet of the EGR system is further increased, the flow rate of the exhaust gas passing through the EGR system is increased, and the purpose of reducing NOx is finally achieved.
In conclusion, the auxiliary supercharging device can be started when acceleration is required, the opening degree of the EGR valve 10 of the EGR system is controlled, the air inlet pressure and the air inlet amount of the engine are improved, the air inlet of the engine can be ensured to be more sufficient, the acceleration time is shortened, and the responsiveness of the engine is improved. In addition, the scheme can also pressurize the engine intake air again through the auxiliary supercharging device, so that the exhaust pressure of the engine is increased, the driving pressure difference of the inlet and the outlet of the EGR system is further increased, the flow rate of the exhaust gas passing through the EGR system is increased, and the aims of increasing the EGR rate and reducing NOx are finally fulfilled.
The invention also provides an engine comprising the engine intake and exhaust system. The derivation process of the beneficial effect of the engine is substantially similar to the derivation process of the beneficial effect brought by the engine intake and exhaust system, and therefore, the description is omitted here.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides an engine advances exhaust system, includes intake pipe (1), blast pipe (2) and EGR system, the inlet end of EGR system's exhaust-gas circulation pipe (3) connect in blast pipe (2) and give vent to anger the end connect in intake pipe (1), its characterized in that, exhaust-gas circulation pipe (3) with between the junction of intake pipe (1) and the engine inlet end intake pipe (1) have first air intake branch pipe (11) and second air intake branch pipe (12) through three-way valve (4) parallel connection, first air intake branch pipe (11) with the end of giving vent to anger of second air intake branch pipe (12) all connect in the engine inlet end, supplementary supercharging device has been arranged in first air intake branch pipe (11).
2. The engine intake and exhaust system according to claim 1, wherein the auxiliary pressure increasing device is an electronic pressure increasing device (5).
3. Engine intake and exhaust system according to claim 1, characterized in that the first intake branch (11) is further arranged with a cooler (6).
4. The engine intake and exhaust system according to claim 3, wherein the auxiliary supercharging device and the cooler (6) are arranged in series in the intake direction.
5. The engine intake and exhaust system according to claim 1, further comprising a turbocharger, a turbine (15) of which is connected to the exhaust pipe (2), and a compressor (14) of which is connected to the intake pipe (1).
6. Engine intake and exhaust system according to claim 5, characterized in that an intercooler (13) is arranged in the intake pipe (1) between the compressor (14) and the junction of the exhaust gas circulation pipe (3) and the intake pipe (1).
7. The engine intake and exhaust system according to claim 1, characterized by further comprising an engine control unit (8), wherein the engine control unit (8) comprises an opening degree control module for adjusting the opening degree of an EGR valve (10) of the EGR system, a three-way control module for controlling the direction of the three-way valve (4), and a supercharging control module for adjusting the rotation speed of the auxiliary supercharging device.
8. An engine comprising an engine intake and exhaust system according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910945578.7A CN110552780A (en) | 2019-09-30 | 2019-09-30 | Engine air intake and exhaust system and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910945578.7A CN110552780A (en) | 2019-09-30 | 2019-09-30 | Engine air intake and exhaust system and engine |
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| Publication Number | Publication Date |
|---|---|
| CN110552780A true CN110552780A (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910945578.7A Pending CN110552780A (en) | 2019-09-30 | 2019-09-30 | Engine air intake and exhaust system and engine |
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| Country | Link |
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| CN (1) | CN110552780A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114738143A (en) * | 2022-03-31 | 2022-07-12 | 重庆长安汽车股份有限公司 | High EGR rate system of single cylinder pressure boost gasoline engine |
| CN115030841A (en) * | 2022-04-29 | 2022-09-09 | 东风商用车有限公司 | Supercharging device and EGR (exhaust gas Recirculation) exhaust system |
| CN115387938A (en) * | 2022-09-22 | 2022-11-25 | 潍柴动力股份有限公司 | Engine EGR system, vehicle and engine EGR control method |
| CN117780522A (en) * | 2024-02-27 | 2024-03-29 | 潍柴动力股份有限公司 | Hydrogen engine control method and device, vehicle and storage medium |
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| CN208900243U (en) * | 2018-09-30 | 2019-05-24 | 潍柴动力股份有限公司 | A kind of engine and its air inlet system and exhaust system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114738143A (en) * | 2022-03-31 | 2022-07-12 | 重庆长安汽车股份有限公司 | High EGR rate system of single cylinder pressure boost gasoline engine |
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| CN115387938A (en) * | 2022-09-22 | 2022-11-25 | 潍柴动力股份有限公司 | Engine EGR system, vehicle and engine EGR control method |
| CN115387938B (en) * | 2022-09-22 | 2024-03-19 | 潍柴动力股份有限公司 | Engine EGR system, vehicle and engine EGR control method |
| CN117780522A (en) * | 2024-02-27 | 2024-03-29 | 潍柴动力股份有限公司 | Hydrogen engine control method and device, vehicle and storage medium |
| CN117780522B (en) * | 2024-02-27 | 2024-06-18 | 潍柴动力股份有限公司 | Hydrogen engine control method and device, vehicle and storage medium |
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Application publication date: 20191210 |
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