CN112211757A - Supercharged diesel engine EGR rate flexible adjustable system and adjusting method - Google Patents
Supercharged diesel engine EGR rate flexible adjustable system and adjusting method Download PDFInfo
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- CN112211757A CN112211757A CN202011096142.4A CN202011096142A CN112211757A CN 112211757 A CN112211757 A CN 112211757A CN 202011096142 A CN202011096142 A CN 202011096142A CN 112211757 A CN112211757 A CN 112211757A
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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
- F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
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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
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake 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
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
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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
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
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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
- F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
- F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
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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
- F02M35/10255—Arrangements of valves; Multi-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Supercharger (AREA)
Abstract
The invention aims to provide a supercharged diesel engine EGR rate flexible adjustable system and an adjusting method, wherein the supercharged diesel engine EGR rate flexible adjustable system comprises a diesel engine and a turbocharger, an exhaust pipe of the diesel engine is connected with a turbine of the turbocharger, an outlet of the turbine is respectively connected with an atmosphere and an injection fluid inlet pipe, the injection fluid inlet pipe is connected with an ejector through an injection fluid control valve, an outlet of a gas compressor of the turbocharger is respectively connected with a working fluid inlet pipe and a mixed fluid exhaust pipe, the working fluid inlet pipe is connected with the ejector through the working fluid control valve, the ejector is connected with a mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected with an inlet. The injection effect of the ejector is utilized to guide the low-pressure waste gas passing through the turbine back to the cylinder by means of high-pressure air, so that the flexible EGR rate of the diesel engine is realized on the premise of not influencing the working efficiency of the turbocharger, particularly the high EGR rate is realized under a large-load working condition, and the contradiction between turbocharging and the EGR rate of the diesel engine under the large-load working condition is solved.
Description
Technical Field
The invention relates to a diesel engine, in particular to a diesel engine with EGR.
Background
With the increasing strictness of emission regulations, higher demands are being made on the pollutant emissions of diesel engines, in particular the emissions of NOx. Currently, Exhaust Gas Recirculation (EGR) is the main technology for reducing nitrogen oxide (NOx) emissions from diesel engines because the introduction of exhaust gas increases the specific heat capacity of the in-cylinder mixture, the maximum temperature of combustion decreases, and the addition of inert gas decreases the proportion of fresh air entering the cylinder and the oxygen concentration, which combine to suppress NOx production.
In the existing diesel engine solutions with turbochargers and EGR systems, a portion of the exhaust gas exiting the cylinder is used to drive the turbine of the turbocharger, so that the compressor rotates to compress fresh air into the cylinder, and another portion of the exhaust gas is directed from the exhaust pipe directly back into the cylinder without driving the turbine. The technical scheme is not suitable for the full working condition range of the engine under the large load of the diesel engine but the supercharged diesel engine, particularly under the large load working condition. This is because, in order to ensure the power output of the diesel engine under the heavy load condition, more exhaust gas needs to be introduced into the turbocharging system to compress more fresh air, so as to increase the air intake amount.
Disclosure of Invention
The invention aims to provide a supercharged diesel engine EGR rate flexible adjustable system and an adjusting method for solving the technical problems that the existing EGR system cannot realize high EGR rate under a large-load working condition and is difficult to reduce NOx emission under a large load.
The purpose of the invention is realized as follows:
the invention relates to a system for flexibly adjusting EGR rate of a supercharged diesel engine, which is characterized in that: the exhaust pipe of the diesel engine is connected with a turbine of the turbocharger, the outlet of the turbine is respectively connected with an atmosphere and an injection fluid intake pipe, the injection fluid intake pipe is connected with an ejector through an injection fluid control valve, the outlet of a gas compressor of the turbocharger is respectively connected with a working fluid intake pipe and a mixed fluid exhaust pipe, the working fluid intake pipe is connected with the ejector through the working fluid control valve, the ejector is connected with a mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected with the intake pipe of the diesel engine through an intercooler.
The system for flexibly adjusting the EGR rate of the supercharged diesel engine can further comprise:
1. the ejector comprises an inlet shell, a mixing chamber and a diffusion chamber which are sequentially connected, a working fluid channel is arranged in the inlet shell, a working fluid inlet and a nozzle are respectively arranged at two ends of the working fluid channel, the working fluid inlet is connected with a working fluid control valve, an ejection fluid inlet is arranged on the inlet shell and is connected with the ejection fluid control valve, a mixed fluid outlet is arranged at the end part of the diffusion chamber, and the mixed fluid outlet is connected with a mixed fluid exhaust pipe.
2. The diameter of the working fluid channel decreases toward the nozzle from the working fluid inlet.
The invention relates to an adjusting method of a supercharged diesel engine EGR rate flexible adjustable system, which is characterized by comprising the following steps:
under the working condition of small load, the injection fluid control valve and the working fluid control valve are partially opened, one part of pressurized air at the rear end of the air compressor enters a cylinder of a diesel engine after being cooled by an intercooler, the other part of the pressurized air enters from a working fluid inlet of the injector, the pressurized air flows out from the nozzle at high speed and enters a mixing chamber, the diameter of a pipeline is reduced when the pressurized air flows through the nozzle, the cross-sectional area of gas circulation is reduced, the flow rate of the gas is increased, a low-pressure area appears at the outlet of the nozzle, a pressure difference is formed between the low-pressure area and low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the injector through the injection fluid inlet, the low-pressure waste gas and the pressurized air flow through a diffusion chamber after the mixing and the energy exchange are completed in the mixing chamber, the injector is discharged from;
under the working condition of large load, the injection fluid control valve and the working fluid control valve are completely opened, pressurized air at the rear end of the air compressor enters the ejector from the working fluid module, low-pressure waste gas enters the ejector through the injection fluid air inlet pipe and the injection fluid control valve, and the low-pressure waste gas is mixed with the pressurized air in the ejector and then enters the air inlet pipe through the mixed fluid exhaust pipe, so that high EGR rate is obtained in a cylinder of the diesel engine, and the suppression of NOx under the working condition of large load is realized.
The invention has the advantages that: the injection effect of the ejector is utilized to guide the low-pressure waste gas passing through the turbine back to the cylinder by means of high-pressure air, so that the flexible EGR rate of the diesel engine is realized on the premise of not influencing the working efficiency of the turbocharger, particularly the high EGR rate is realized under a large-load working condition, and the contradiction between turbocharging and the EGR rate of the diesel engine under the large-load working condition is effectively solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the ejector of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1-2, the present invention includes an injection fluid control valve 3, a working fluid control valve 4, an injector 5, an injection fluid intake pipe 101, a working fluid intake pipe 102, and a mixed fluid exhaust pipe 103.
Wherein the ejector 5 comprises a nozzle 7, a mixing chamber 8, a diffusion chamber 9, a working fluid inlet 10, an ejector fluid inlet 11 and a mixed fluid outlet 12, as shown in fig. 2. An injection fluid inlet 11, a working fluid inlet 10 and a mixed fluid outlet 12 of the ejector 5 are respectively connected with the injection fluid module, the working fluid module and the mixed fluid module. The ejector 5 is used for introducing low-pressure exhaust gas at the rear end of the turbine into the mixed fluid module by utilizing the pressurized air.
The injection fluid module comprises an injection fluid air inlet pipe 101 and an injection fluid control valve 3, one end of the injection fluid air inlet pipe 101 is connected with an exhaust pipe at the rear end of the turbine, the other end of the injection fluid air inlet pipe 101 is connected with an injection fluid inlet 11 of the injector 5, and the injection fluid control valve 3 is installed on the injection fluid air inlet pipe 101 and is installed in front of the injection fluid inlet 11 of the injector 5. The ejector fluid module functions as a passage for low pressure exhaust gas to enter the ejector 5 and controls the flow of low pressure exhaust gas to the ejector according to engine load.
The working fluid module comprises a working fluid inlet pipe 102 and a working fluid control valve 4, one end of the working fluid inlet pipe 102 is connected with an air inlet pipe at the rear end of the air compressor, the other end of the working fluid inlet pipe 102 is connected with a working fluid inlet 10 of the ejector 5, and the working fluid control valve 4 is installed on the working fluid inlet pipe 102 and is installed in front of the working fluid inlet 10 of the ejector 5. The ejector fluid module functions as a passage for charge air to enter the ejector and controls the flow of charge air to the ejector based on engine load.
The mixed fluid module comprises a mixed fluid exhaust pipe 103, and two ends of the mixed fluid exhaust pipe 103 are respectively connected with a mixed fluid outlet 12 of the ejector 5 and an air inlet pipe in front of the intercooler 6. The mixed fluid module functions as a passage for the mixed fluid of the ejector 5 to enter the air intake pipe.
Under the working condition of small load, the openings of the injection fluid control valve 3 and the working fluid control valve 4 are smaller, and the injection fluid module and the working fluid module are communicated with the injector 5. One part of the pressurized air at the rear end of the air compressor enters a cylinder of the diesel engine 1 after being cooled by an intercooler 6 through an air inlet pipe, the other part of the pressurized air enters from a working fluid inlet 10 of an ejector 5 at a certain pressure, the pressurized air flows out from a nozzle 7 at a high speed and then enters into a mixing chamber 8, as the diameter of the pipeline is reduced when the pressurized air flows through the nozzle 7, the cross-sectional area for gas circulation is reduced, the flow velocity of the gas is increased, a low-pressure area appears at the outlet of the nozzle 7, a huge pressure difference is formed between the low-pressure area and the low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the ejector 5 through the ejector fluid inlet 11, the low-pressure waste gas and the pressurized air are uniformly mixed and subjected to energy exchange in the mixing chamber 8, then the low-pressure waste gas and the pressurized air flow through the diffusion chamber 9 and are discharged out of the ejector 5 from the mixed fluid outlet 12, and the mixed fluid finally enters the.
Under a large-load working condition, the injection fluid control valve 3 and the working fluid control valve 4 are completely opened, pressurized air at the rear end of the air compressor enters the ejector 5 from the working fluid module, large-flow low-pressure waste gas enters the ejector 5 after passing through the injection fluid module, and after being uniformly mixed with the pressurized air in the ejector 5, the high-flow low-pressure waste gas enters the air inlet pipe through the mixed fluid exhaust pipe 103, so that high EGR rate is obtained in a cylinder of the diesel engine 1, and the suppression of NOx under the large-load working condition is realized.
Claims (4)
1. The utility model provides a supercharged diesel engine EGR rate flexible adjustable system which characterized by: the exhaust pipe of the diesel engine is connected with a turbine of the turbocharger, the outlet of the turbine is respectively connected with an atmosphere and an injection fluid intake pipe, the injection fluid intake pipe is connected with an ejector through an injection fluid control valve, the outlet of a gas compressor of the turbocharger is respectively connected with a working fluid intake pipe and a mixed fluid exhaust pipe, the working fluid intake pipe is connected with the ejector through the working fluid control valve, the ejector is connected with a mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected with the intake pipe of the diesel engine through an intercooler.
2. The supercharged diesel engine EGR rate flexible regulation system of claim 1 further comprising: the ejector comprises an inlet shell, a mixing chamber and a diffusion chamber which are sequentially connected, a working fluid channel is arranged in the inlet shell, a working fluid inlet and a nozzle are respectively arranged at two ends of the working fluid channel, the working fluid inlet is connected with a working fluid control valve, an ejection fluid inlet is arranged on the inlet shell and is connected with the ejection fluid control valve, a mixed fluid outlet is arranged at the end part of the diffusion chamber, and the mixed fluid outlet is connected with a mixed fluid exhaust pipe.
3. The supercharged diesel engine EGR rate flexible regulation system of claim 2 further comprising: the diameter of the working fluid channel decreases toward the nozzle from the working fluid inlet.
4. A method for adjusting a system with flexibly adjustable EGR rate of a supercharged diesel engine is characterized by comprising the following steps:
under the working condition of small load, the injection fluid control valve and the working fluid control valve are partially opened, one part of pressurized air at the rear end of the air compressor enters a cylinder of a diesel engine after being cooled by an intercooler, the other part of the pressurized air enters from a working fluid inlet of the injector, the pressurized air flows out from the nozzle at high speed and enters a mixing chamber, the diameter of a pipeline is reduced when the pressurized air flows through the nozzle, the cross-sectional area of gas circulation is reduced, the flow rate of the gas is increased, a low-pressure area appears at the outlet of the nozzle, a pressure difference is formed between the low-pressure area and low-pressure waste gas at the rear end of the turbine, the low-pressure waste gas is sucked into the injector through the injection fluid inlet, the low-pressure waste gas and the pressurized air flow through a diffusion chamber after the mixing and the energy exchange are completed in the mixing chamber, the injector is discharged from;
under the working condition of large load, the injection fluid control valve and the working fluid control valve are completely opened, pressurized air at the rear end of the air compressor enters the ejector from the working fluid module, low-pressure waste gas enters the ejector through the injection fluid air inlet pipe and the injection fluid control valve, and the low-pressure waste gas is mixed with the pressurized air in the ejector and then enters the air inlet pipe through the mixed fluid exhaust pipe, so that high EGR rate is obtained in a cylinder of the diesel engine, and the suppression of NOx under the working condition of large load is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011096142.4A CN112211757A (en) | 2020-10-14 | 2020-10-14 | Supercharged diesel engine EGR rate flexible adjustable system and adjusting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011096142.4A CN112211757A (en) | 2020-10-14 | 2020-10-14 | Supercharged diesel engine EGR rate flexible adjustable system and adjusting method |
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| CN112211757A true CN112211757A (en) | 2021-01-12 |
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| CN202011096142.4A Pending CN112211757A (en) | 2020-10-14 | 2020-10-14 | Supercharged diesel engine EGR rate flexible adjustable system and adjusting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183278A (en) * | 2021-12-07 | 2022-03-15 | 潍柴动力股份有限公司 | EGR ejector pipeline system and EGR control method |
| CN114893278A (en) * | 2022-04-27 | 2022-08-12 | 江铃汽车股份有限公司 | Autonomous development method and system for urban vehicle road emission |
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| CN107939558A (en) * | 2017-10-09 | 2018-04-20 | 中国第汽车股份有限公司 | A kind of internal combustion engine exhaust system with exhaust gas recycling |
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| US4137874A (en) * | 1975-12-10 | 1979-02-06 | Nissan Motor Company, Limited | Exhaust gas recirculation control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183278A (en) * | 2021-12-07 | 2022-03-15 | 潍柴动力股份有限公司 | EGR ejector pipeline system and EGR control method |
| CN114893278A (en) * | 2022-04-27 | 2022-08-12 | 江铃汽车股份有限公司 | Autonomous development method and system for urban vehicle road emission |
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Application publication date: 20210112 |