CN111173649A - Natural gas engine air intake system and EGR control method thereof - Google Patents
Natural gas engine air intake system and EGR control method thereof Download PDFInfo
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- CN111173649A CN111173649A CN202010013010.4A CN202010013010A CN111173649A CN 111173649 A CN111173649 A CN 111173649A CN 202010013010 A CN202010013010 A CN 202010013010A CN 111173649 A CN111173649 A CN 111173649A
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- mixer
- air inlet
- egr
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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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
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
-
- 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
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/04—Gas-air mixing apparatus
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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
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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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
-
- 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
- F02M2026/001—Arrangements; Control features; Details
- F02M2026/005—EGR valve controlled by an engine speed signal
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention relates to a natural gas engine air inlet system, wherein an air inlet connecting pipe of the system is connected with an electronic throttle valve, and the electronic throttle valve is connected with a mixer through a connecting joint; in the vertical direction, the center line of the connecting end of the connecting joint and the electronic throttle valve is higher than that of the connecting end of the mixer, so that the volume of the connecting joint below the horizontal plane of the lowest point in the electronic throttle valve is enough to store condensed water formed in the mixer under the low-speed working condition of-35 ℃; the mixer is provided with a natural gas inlet and an EGR inlet; mixing the natural gas with air in a mixer, and then mixing the natural gas with EGR to form a mixed gas; the outlet of the mixer is connected with the inlet of the air inlet bent pipe, the spoiler is arranged at the inlet of the air inlet bent pipe connected with the outlet of the mixer, and the ratio of the projection area of the spoiler in the vertical direction to the cross-sectional area of the air inlet bent pipe is less than 0.3. The invention can avoid freezing and clamping stagnation of the valve plate caused by backflow of condensed water to the electronic throttle valve and can avoid ice blockage of the air inlet pipeline.
Description
Technical Field
The invention belongs to the technical field of natural gas engine air inlet systems, and relates to a natural gas engine air inlet system and an EGR control method thereof.
Background
With the issuance of the national six-emission regulations, the mainstream technical route of the national six-natural gas engine is changed from lean combustion to equivalent combustion plus EGR (exhaust gas recirculation). Natural gas engines produce more water vapor from combustion than diesel engines, and the introduction of EGR results in an engine intake water vapor content of about 13%. When the engine works at low speed and low load under a certain low-temperature environment, the water vapor is condensed into ice in an air inlet system, and the ice is accumulated to a certain degree to cause that an engine throttle valve plate cannot be opened, an air inlet pipeline is blocked by ice, and the engine cannot work normally.
The air inlet system of the existing natural gas engine is a structure that only two gases of air and natural gas enter the engine.
Disclosure of Invention
The invention aims to provide an anti-icing natural gas engine air inlet system.
In order to solve the technical problem, the natural gas engine air inlet system comprises an air inlet connecting pipe 1, an electronic throttle valve 2, a connecting joint 3, a mixer 4, a spoiler 5 and an air inlet bent pipe 6; the air inlet connecting pipe 1 is connected with the electronic throttle valve 2, and the electronic throttle valve 2 is connected with the mixer 4 through the connecting joint 3; the device is characterized in that in the vertical direction, the center line of the connecting end of the connecting joint 3 and the electronic throttle valve 2 is higher than that of the connecting end of the mixer 4, so that the volume of the connecting joint 3 below the horizontal plane of the lowest point in the electronic throttle valve 2 is enough to store condensed water formed in the mixer 4 under the working condition of-35 ℃ low speed; the mixer 4 is provided with a natural gas inlet 41 and an EGR inlet 42; mixing the natural gas with air in a mixer 4, and then mixing the natural gas with EGR to form mixed gas; the outlet of the mixer 4 is connected with the inlet of the air inlet elbow 6, the spoiler 5 is arranged at the inlet of the air inlet elbow 6 connected with the outlet of the mixer 4, and the ratio of the projection area of the vertical direction to the cross-sectional area of the air inlet elbow 6 is less than 0.3.
The central line of the connecting end of the connecting joint 3 and the electronic throttle valve 2 is higher than the central line of the connecting end of the mixer 4 by more than 25mm in the vertical direction.
The EGR control method of the natural gas engine air inlet system comprises the following steps:
dividing the universal characteristics of the engine into 6 regions, namely setting the EGR rate to be 0 in the region, setting all rotation speed regions of the engine, which are between 950r/min and rated rotation speed and have the engine torque less than or equal to 10%, to be the region II, setting the EGR rate to be 0 in the region, closing the EGR valve in the two regions, setting the region ③, which is between 950r/min and rated rotation speed and has the torque of 10-25%, setting the EGR rate to be increased from 5% to 12%, setting the region IV, which is between 950r/min and maximum torque rotation speed and has the torque of 25% -100%, setting the EGR rate to be increased from ⑥% to 18%, setting the region IV, which is between 25% and 60%, setting the EGR rate to be ⑥% -18%, setting the region IV, setting the EGR rate to be 18%, setting the region ③, which is between the maximum torque rotation speed and rated rotation speed and has the torque of 60% -100%.
The central line of the connecting end of the connecting joint and the electronic throttle valve is higher than the central line of the connecting end of the mixer by more than 25mm in the vertical direction, so that the volume of the connecting joint below the horizontal plane of the lowest point in the electronic throttle valve is enough to store condensed water formed in the mixer under the low-speed working condition of-35 ℃, the condensed water cannot flow back to the electronic throttle valve, and the valve block of the low-temperature throttle valve is prevented from being frozen and clamped; the spoiler is arranged at the inlet of the air inlet bent pipe connected with the outlet of the mixer, and the ratio of the projection area of the spoiler in the vertical direction to the cross-sectional area of the air inlet bent pipe is less than 0.3, so that the ice quantity formed by condensing low-temperature water on the spoiler can not block the air inlet pipeline, and the engine can not work normally.
Because the rotating speed of the engine is higher than the range of 950r/min, the outlet temperature of the EGR cooler is higher than the dew point temperature of water, and water cannot be condensed. Therefore, the EGR control method is provided, when the engine speed is lower than 950r/min, the EGR rate is set to be 0, when the engine load is lower than 10%, the EGR rate of all the speeds is set to be 0, the EGR valve is closed, EGR is not introduced any more, so that only a small amount of EGR gas is provided at the outlet of the EGR cooler, and icing in the mixer and the air inlet bent pipe caused by precipitation of a large amount of condensed water in the EGR cooler and the EGR pipeline is avoided. Thus, when the ambient temperature is lower than-35 degrees and the engine is running at low engine speed, icing of the engine intake system does not occur.
According to the invention, through the design of storing the backflow condensate water of the connecting joint, the valve block is prevented from being frozen and stuck due to the fact that the condensate water flows back to the electronic throttle valve. By designing the spoiler with a proper cross-sectional area, the air inlet pipeline can be prevented from being blocked by ice.
Drawings
FIG. 1 is a schematic diagram of the behavior of the EGR cooler outlet temperature and the dew point difference of an engine;
FIG. 2 and FIG. 3 are schematic structural diagrams of an air intake system of the natural gas engine of the invention; in the figure, 1 is an air inlet connecting pipe, 2 is an electronic throttle valve, 3 is a connecting joint, 4 is a mixer, 5 is a spoiler, 6 is an air inlet bent pipe, and 21 is an electronic throttle valve plate.
FIG. 4 is a side view of the spoiler and the inlet elbow.
FIG. 5 is a side view of the electronic throttle.
Fig. 6 is a cross-sectional view of the mixer.
FIG. 7 is a schematic of EGR rate calibration.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 2 to 6, the natural gas engine intake system of the present invention includes an intake pipe 1, an electronic throttle 2, a connector 3, a mixer 4, a spoiler 5, and an intake elbow 6. The air inlet connecting pipe 1 is connected with the electronic throttle valve 2, the electronic throttle valve 2 is connected with the mixer 4 through the connecting joint 3, the central line of the connecting end of the connecting joint 3 and the electronic throttle valve 2 is higher than the central line of the connecting end of the mixer 4 by more than 25mm in the vertical direction, so that the volume of the connecting joint 3 below the horizontal plane of the lowest point in the electronic throttle valve 2 is enough for storing condensed water at minus 35 ℃, and when the rotating speed of an engine is lower than 950r/min, the condensed water formed in the mixer 4 is prevented from flowing back to the electronic throttle valve 2, and the valve plate 21 of the electronic throttle valve 2 is prevented from. The mixer 4 is provided with a natural gas inlet 41 and one or two EGR inlets 42 (the number of EGR inlets is determined according to the outlet of the EGR valve, and the design of only one EGR inlet can also be adopted); in the figure, 43 is a mixing cavity of air and natural gas, and 44 is a mixing cavity of air, natural gas and EGR; the natural gas inlet 41 is connected with a natural gas pipeline; the EGR inlet 42 is connected to the EGR cooler through an EGR valve; the natural gas is mixed with air firstly in the mixer 4, then mixed with EGR to form mixed gas, and the mixed gas is further mixed uniformly through the spoiler 5 and then enters the cylinder cover through the air inlet bent pipe 6. The spoiler 5 is arranged at the inlet of the air inlet bent pipe 6 connected with the outlet of the mixer 4, and the ratio of the projection area of the spoiler to the cross-sectional area of the air inlet bent pipe 6 in the vertical direction is less than 0.3, so that the air inlet bent pipe 6 cannot be blocked by the ice quantity formed by condensing low-temperature water on the spoiler 5, and the engine cannot work normally.
According to the graph shown in FIG. 1, when the engine speed is higher than the range of 950r/min, the outlet temperature of the EGR cooler is higher than the dew point temperature of water, and water cannot be condensed in the air inlet system. When the engine speed is lower than 950r/min, the EGR rate is set to be 0, when the engine load is lower than 10%, the EGR rate of all the speeds is set to be 0, the EGR valve is closed, EGR is not introduced any more, only a small amount of EGR gas is led to an outlet of the EGR cooler, and the phenomenon that a large amount of condensed water is separated out in the EGR cooler and an EGR pipeline to cause icing in a mixer and an air inlet bent pipe is avoided. Thus, when the ambient temperature is below-35 degrees and the engine is running at low engine speeds, ice formation in the engine air intake system does not occur.
The engine EGR rate control method of the natural gas engine air inlet system comprises the following steps: when the engine speed is lower than 950r/min, the engine EGR rate is set to 0, and when the engine load is lower than 10%, the EGR rates for all the speeds are set to 0. Therefore, the EGR valve is closed, EGR is not introduced any more, only a small amount of EGR gas is discharged from the outlet of the EGR cooler, and icing in the mixer and the air inlet bent pipe caused by precipitation of a large amount of condensed water in the EGR cooler and the EGR pipeline is avoided. The EGR rate increases with increasing engine speed and load at other engine operating conditions. The pumping loss is reduced and the oil consumption is improved due to the increase of the EGR rate under the medium and low load conditions. At high speed and high load, the combustion temperature is reduced due to the increase of the EGR rate, and knocking is avoided.
As shown in FIG. 7, ① engine characteristics are divided into 6 regions, ① region where ① engine speed is lower than 950r/min is ① region (I) where ① EGR rate is set to 0, all ① regions where ① engine speed is between 950r/min and ① rated speed and ① engine torque is less than or equal to 10% are ① region (II) where ① EGR rate is set to 0, ① EGR valve is closed in ① two regions, no EGR is introduced, so that only a small amount of EGR gas exists at ① outlet of ① EGR cooler, and icing in ① mixer and ① intake elbow due to precipitation of a large amount of condensed water in ① EGR cooler and ① EGR pipeline is avoided, ① region where ① engine speed is between 950r/min and ① rated speed and ① torque is 10- ⑤% is ① region (III) where ① engine speed is between 950r/min and ① rated speed and ① torque is increased with ① increase of ① engine speed and load, ① EGR rate is calibrated to be increased from 5% to 12%, ① EGR rate is calibrated to be increased under ① condition that ① engine speed is not increased from 950r/min to ① maximum torque and ① rated torque, ① region (II) is ① region where ① exhaust rate is reduced from ⑤% to ① combustion temperature and ① combustion temperature is reduced from 60%, ① combustion temperature range from ⑥% to ⑥%, and ① combustion temperature is reduced from 60%.
Claims (3)
1. A natural gas engine air inlet system comprises an air inlet connecting pipe (1), an electronic throttle valve (2), a connecting joint (3), a mixer (4), a spoiler (5) and an air inlet bent pipe (6); the air inlet connecting pipe (1) is connected with the electronic throttle valve (2), and the electronic throttle valve (2) is connected with the mixer (4) through the connecting joint (3); the device is characterized in that in the vertical direction, the center line of the connecting end of the connecting joint (3) and the electronic throttle valve (2) is higher than that of the connecting end of the mixer (4), so that the volume of the connecting joint (3) below the horizontal plane of the lowest point in the electronic throttle valve (2) is enough to store condensed water formed in the mixer (4) under the low-speed working condition of-35 ℃; the mixer (4) is provided with a natural gas inlet (41) and an EGR inlet (42); the natural gas is mixed with air in the mixer (4) and then mixed with EGR to form mixed gas; the outlet of the mixer (4) is connected with the inlet of the air inlet bent pipe (6), the spoiler (5) is arranged at the inlet of the air inlet bent pipe (6) connected with the outlet of the mixer (4), and the ratio of the projection area of the vertical direction to the cross-sectional area of the air inlet bent pipe (6) is less than 0.3.
2. The natural gas engine intake system of claim 1, wherein the connecting joint (3) is higher than the connecting end centerline of the electronic throttle valve (2) by more than 25mm in the vertical direction than the connecting end centerline of the mixer (4).
3. An EGR control method of the intake system of the natural gas engine according to claim 1 is as follows:
dividing the universal characteristics of the engine into 6 regions, namely setting the EGR rate to be 0 in the region, setting all rotation speed regions of the engine, which are between 950r/min and rated rotation speed and have the engine torque less than or equal to 10%, to be the region II, setting the EGR rate to be 0 in the region, closing the EGR valve in the two regions, setting the region ③, which is between 950r/min and rated rotation speed and has the torque of 10-25%, setting the EGR rate to be increased from 5% to 12%, setting the region IV, which is between 950r/min and maximum torque rotation speed and has the torque of 25% -100%, setting the EGR rate to be increased from ⑥% to 18%, setting the region IV, which is between 25% and 60%, setting the EGR rate to be ⑥% -18%, setting the region IV, setting the EGR rate to be 18%, setting the region ③, which is between the maximum torque rotation speed and rated rotation speed and has the torque of 60% -100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010013010.4A CN111173649B (en) | 2020-01-07 | 2020-01-07 | Natural gas engine air intake system and EGR control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010013010.4A CN111173649B (en) | 2020-01-07 | 2020-01-07 | Natural gas engine air intake system and EGR control method thereof |
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| CN111173649A true CN111173649A (en) | 2020-05-19 |
| CN111173649B CN111173649B (en) | 2021-10-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927657A (en) * | 2020-08-11 | 2020-11-13 | 一汽解放汽车有限公司 | Engine air inlet system, structure design method and low-temperature exhaust gas circulation control method |
| US11519365B2 (en) | 2021-04-15 | 2022-12-06 | Cummins Inc. | Intake system for natural gas engine |
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| CN204060994U (en) * | 2014-08-07 | 2014-12-31 | 上海汽车集团股份有限公司 | The engine intake manifold that anti-closure freezes |
| JP2019039374A (en) * | 2017-08-25 | 2019-03-14 | マツダ株式会社 | Suction/exhaust device of engine for vehicle |
| CN109695517A (en) * | 2018-12-29 | 2019-04-30 | 潍柴动力股份有限公司 | A kind of gas mixer |
| CN110552823A (en) * | 2019-09-18 | 2019-12-10 | 广西玉柴机器股份有限公司 | Air inlet connecting pipe assembly and natural gas engine thereof |
| CN110578610A (en) * | 2018-11-30 | 2019-12-17 | 长城汽车股份有限公司 | Control strategy for engine with low pressure EGR system and vehicle |
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2020
- 2020-01-07 CN CN202010013010.4A patent/CN111173649B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204060994U (en) * | 2014-08-07 | 2014-12-31 | 上海汽车集团股份有限公司 | The engine intake manifold that anti-closure freezes |
| JP2019039374A (en) * | 2017-08-25 | 2019-03-14 | マツダ株式会社 | Suction/exhaust device of engine for vehicle |
| CN110578610A (en) * | 2018-11-30 | 2019-12-17 | 长城汽车股份有限公司 | Control strategy for engine with low pressure EGR system and vehicle |
| CN109695517A (en) * | 2018-12-29 | 2019-04-30 | 潍柴动力股份有限公司 | A kind of gas mixer |
| CN110552823A (en) * | 2019-09-18 | 2019-12-10 | 广西玉柴机器股份有限公司 | Air inlet connecting pipe assembly and natural gas engine thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927657A (en) * | 2020-08-11 | 2020-11-13 | 一汽解放汽车有限公司 | Engine air inlet system, structure design method and low-temperature exhaust gas circulation control method |
| US11519365B2 (en) | 2021-04-15 | 2022-12-06 | Cummins Inc. | Intake system for natural gas engine |
| US11821390B2 (en) | 2021-04-15 | 2023-11-21 | Cummins Inc. | Intake system for natural gas engine |
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| CN111173649B (en) | 2021-10-01 |
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